US20060123960A1 - Safety systems for power equipment - Google Patents
Safety systems for power equipment Download PDFInfo
- Publication number
- US20060123960A1 US20060123960A1 US11/353,423 US35342306A US2006123960A1 US 20060123960 A1 US20060123960 A1 US 20060123960A1 US 35342306 A US35342306 A US 35342306A US 2006123960 A1 US2006123960 A1 US 2006123960A1
- Authority
- US
- United States
- Prior art keywords
- blade
- saw
- dangerous condition
- entitled
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D59/00—Accessories specially designed for sawing machines or sawing devices
- B23D59/001—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B13/00—Band or strap sawing machines; Components or equipment therefor
- B27B13/14—Braking devices specially designed for band sawing machines, e.g. acting after damage of the band saw blade
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
- B27B5/29—Details; Component parts; Accessories
- B27B5/38—Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
- F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
- F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S83/00—Cutting
- Y10S83/01—Safety devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/04—Processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/081—With randomly actuated stopping means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/081—With randomly actuated stopping means
- Y10T83/088—Responsive to tool detector or work-feed-means detector
- Y10T83/089—Responsive to tool characteristic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7684—With means to support work relative to tool[s]
- Y10T83/7693—Tool moved relative to work-support during cutting
- Y10T83/7697—Tool angularly adjustable relative to work-support
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7684—With means to support work relative to tool[s]
- Y10T83/7701—Supporting surface and tool axis angularly related
- Y10T83/7705—Adjustable angular relationship
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7684—With means to support work relative to tool[s]
- Y10T83/7722—Support and tool relatively adjustable
- Y10T83/7726—By movement of the tool
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7684—With means to support work relative to tool[s]
- Y10T83/773—Work-support includes passageway for tool [e.g., slotted table]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7755—Carrier for rotatable tool movable during cutting
- Y10T83/7763—Tool carrier reciprocable rectilinearly
- Y10T83/7776—With means to reciprocate carrier
- Y10T83/778—And means to rotate tool
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7755—Carrier for rotatable tool movable during cutting
- Y10T83/7788—Tool carrier oscillated or rotated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/869—Means to drive or to guide tool
- Y10T83/8773—Bevel or miter cut
Definitions
- mechanized equipment has allowed workers to produce goods with greater speed and less effort than possible with manually-powered tools.
- the power and high operating speeds of mechanized equipment creates a risk for those operating such machinery.
- Each year thousands of people are maimed or killed by accidents involving power equipment.
- guards that physically blocks an operator from making contact with dangerous components of machinery, such as belts, shafts or blades.
- guards are effective to reduce the risk of injury, however, there are many instances where the nature of the operations to be performed precludes using a guard that completely blocks access to hazardous machine parts.
- radio-frequency safety systems which utilize radio-frequency signals to detect the presence of a user's hand in a dangerous area of the machine and thereupon prevent or interrupt operation of the machine.
- U.S. Pat. Nos. 4,959,909, 5,025,175, 5,122,091, 5,198,702, 5,201,684, 5,272,946, and 5,510,685 disclose safety systems for use with meat-skinning equipment, and are incorporated herein by reference. These systems interrupt or reverse power to the motor, or disengage a clutch, upon contact with a user's hand by any dangerous portion of the machine. Typically, contact between the user and the machine is detected by monitoring for electrical contact between a fine wire mesh in a glove worn by the user and some metal component in the dangerous area of the machine.
- U.S. Pat. Nos. 3,785,230 and 4,026,177 disclose a safety system for use on circular saws to stop the blade when a user's hand approaches the blade.
- the system uses the blade as an antenna in an electromagnetic proximity detector to detect the approach of a user's hand prior to actual contact with the blade.
- the system engages a brake using a standard solenoid.
- a standard solenoid Unfortunately, such a system is prone to false triggers and is relatively slow acting because of the solenoid.
- 4,117,752 which is herein incorporated by reference, discloses a similar braking system for use with a band saw, where the brake is triggered by actual contact between the user's hand and the blade.
- the system described for detecting blade contact does not appear to be functional to accurately and reliably detect contact.
- the system relies on standard electromagnetic brakes operating off of line voltage to stop the blade and pulleys of the band saw. It is believed that such brakes would take 50 ms-1 s to stop the blade. Therefore, the system is too slow to stop the blade quickly enough to avoid serious injury.
- proximity-type sensors can be used with some equipment to increase the time available to stop the moving pieces, in many cases the user's hands must be brought into relatively close proximity to the cutting element in the normal course of operation. For example, many types of woodworking equipment require that the user's hands pass relatively close to the cutting tools. As a result, existing proximity-type sensors, which are relatively imprecise, have not proven effective with this type of equipment. Even where proximity sensors are practical, existing brake systems have not operated quickly enough to prevent serious injury in many cases.
- the cutting tool In equipment where proximity-type detection have not proven effective, the cutting tool must stop very quickly in the event of user contact to avoid serious injury.
- a user may feed a piece of wood through a table saw at a rate of approximately one foot per second. Assuming an average reaction time of approximately one-tenth of a second, the hand may have moved well over an inch before the user even detects the contact. This distance is more than sufficient to result in the loss of several digits, severing of vital vessels and tendons, or even complete severing of a hand. If a brake is triggered immediately upon contact with the saw's blade, the blade must be stopped within approximately one-hundredth of a second to limit the depth of injury to one-eighth of an inch.
- Standard solenoids or other electromagnetic devices are generally not designed to act in this time scale, particularly where significant force must be generated.
- solenoids or electromagnetic brakes that operate on 60 hz electrical power, it is possible that the power line will be at a phase that has low voltage at the time the brake is triggered and several milliseconds may elapse before the voltage reaches a sufficient level even to begin physical displacement of the brake, much less achieve a complete stoppage of the blade or cutting tool.
- FIG. 1 is a schematic block diagram of a machine with a fast-acting safety system according to the present invention.
- FIG. 2 is a schematic diagram of an exemplary safety system in the context of a machine having a circular blade.
- Machine 10 may be any of a variety of different machines adapted for cutting workpieces, such as wood, including a table saw, miter saw (chop saw), radial arm saw, circular saw, band saw, jointer, planer, etc.
- Machine 10 includes an operative structure 12 having a cutting tool 14 and a motor assembly 16 adapted to drive the cutting tool.
- Machine 10 also includes a safety system 18 configured to minimize the potential of a serious injury to a person using machine 10 .
- Safety system 18 is adapted to detect the occurrence of one or more dangerous conditions during use of machine 10 . If such a dangerous condition is detected, safety system 18 is adapted to engage operative structure 12 to limit any injury to the user caused by the dangerous condition.
- Machine 10 also includes a suitable power source 20 to provide power to operative structure 12 and safety system 18 .
- Power source 20 may be an external power source such as line current, or an internal power source such as a battery.
- power source 20 may include a combination of both external and internal power sources.
- power source 20 may include two or more separate power sources, each adapted to power different portions of machine 10 .
- operative structure 12 may take any one of many different forms, depending on the type of machine 10 .
- operative structure 12 may include a stationary housing configured to support motor assembly 16 in driving engagement with cutting tool 14 .
- operative structure 12 may include a movable structure configured to carry cutting tool 14 between multiple operating positions.
- operative structure 12 may include one or more transport mechanisms adapted to convey a workpiece toward and/or away from cutting tool 14 .
- Motor assembly 16 includes one or more motors adapted to drive cutting tool 14 .
- the motors may be either directly or indirectly coupled to the cutting tool, and may also be adapted to drive workpiece transport mechanisms.
- Cutting tool 14 typically includes one or more blades or other suitable cutting implements that are adapted to cut or remove portions from the workpieces.
- the particular form of cutting tool 14 will vary depending upon the various embodiments of machine 10 .
- cutting tool 14 will typically include one or more circular rotating blades having a plurality of teeth disposed along the perimetrical edge of the blade.
- the cutting tool typically includes a plurality of radially spaced-apart blades.
- the cutting tool includes an elongate, circuitous tooth-edged band.
- Safety system 18 includes a detection subsystem 22 , a reaction subsystem 24 and a control subsystem 26 .
- Control subsystem 26 may be adapted to receive inputs from a variety of sources including detection subsystem 22 , reaction subsystem 24 , operative structure 12 and motor assembly 16 .
- the control subsystem may also include one or more sensors adapted to monitor selected parameters of machine 10 .
- control subsystem 26 typically includes one or more instruments operable by a user to control the machine.
- the control subsystem is configured to control machine 10 in response to the inputs it receives.
- Detection subsystem 22 is configured to detect one or more dangerous, or triggering, conditions during use of machine 10 .
- the detection subsystem may be configured to detect that a portion of the user's body is dangerously close to, or in contact with, a portion of cutting tool 14 .
- the detection subsystem may be configured to detect the rapid movement of a workpiece due to kickback by the cutting tool, such as is described in U.S. Provisional Patent Application Ser. No. 60/182,866, filed Feb. 16, 2000, and U.S. Pat. No. 4,267,914, the disclosures of which are herein incorporated by reference.
- detection subsystem 22 may inform control subsystem 26 of the dangerous condition, which then activates reaction subsystem 24 .
- the detection subsystem may be adapted to activate the reaction subsystem directly.
- reaction subsystem 24 is configured to engage operative structure 12 quickly to prevent serious injury to the user. It will be appreciated that the particular action to be taken by reaction subsystem 24 will vary depending on the type of machine 10 and/or the dangerous condition that is detected. For example, reaction subsystem 24 may be configured to do one or more of the following: stop the movement of cutting tool 14 , disconnect motor assembly 16 from power source 20 , place a barrier between the cutting tool and the user, or retract the cutting tool from its operating position, etc. The reaction subsystem may be configured to take a combination of steps to protect the user from serious injury. Placement of a barrier between the cutting tool and teeth is described in more detail in U.S. Provisional Patent Application Ser. No. 60/225,206, filed Aug.
- reaction subsystem 24 typically will vary depending on which action(s) are taken.
- reaction subsystem 24 is configured to stop the movement of cutting tool 14 and includes a brake mechanism 28 , a biasing mechanism 30 , a restraining mechanism 32 , and a release mechanism 34 .
- Brake mechanism 28 is adapted to engage operative structure 12 under the urging of biasing mechanism 30 .
- restraining mechanism 32 holds the brake mechanism out of engagement with the operative structure.
- the brake mechanism upon receipt of an activation signal by reaction subsystem 24 , the brake mechanism is released from the restraining mechanism by release mechanism 34 , whereupon, the brake mechanism quickly engages at least a portion of the operative structure to bring the cutting tool to a stop.
- FIG. 2 one example of the many possible implementations of safety system 18 is shown.
- System 18 is configured to engage an operative structure having a cutting tool in the form of a circular blade 40 mounted on a rotating shaft or arbor 42 .
- Blade 40 includes a plurality of cutting teeth (not shown) disposed around the outer edge of the blade.
- braking mechanism 28 is adapted to engage the teeth of blade 40 and stop the rotation of the blade.
- FIGS. 1 and 2 schematically illustrate machine 10 as a generic woodworking machine, it will be appreciated that safety system 18 may be incorporated into virtually any specific type of woodworking machine. For example, the following U.S.
- Provisional Patent Applications describe safety system 18 in the context of various specific types of machines such as table saws, miter saws, radial arm saws, band saws, pneumatic up-cut saws, routers, etc.: U.S. Provisional Patent Application Ser. No. 60/225,058, filed Aug. 14, 2000, entitled “Table Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/225,057, filed Aug. 14, 2000, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/233,459, filed Sep. 18, 2000, entitled “Translation Stop For Use In Power Equipment,” U.S. Provisional Patent Application Ser. No.
- detection subsystem 22 is adapted to detect the dangerous condition of the user coming into contact with blade 40 .
- the detection subsystem includes a sensor assembly, such as contact detection plates 44 and 46 , configured to detect any contact between the user's body and the blade.
- the detection subsystem is adapted to transmit a signal to control subsystem 26 when contact between the user and the blade is detected.
- Various exemplary embodiments and implementations of detection subsystem 22 are described in more detail in U.S. Provisional Patent Application Ser. No. 60/225,200, filed Aug. 14, 2000, entitled “Contact Detection System For Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/225,211, filed Aug.
- Control subsystem 26 includes one or more instruments 48 that are operable by a user to control the motion of blade 40 .
- Instruments 48 may include start/stop switches, speed controls, direction controls, etc.
- Control subsystem 26 also includes a logic controller 50 connected to receive the user's inputs via instruments 48 .
- Logic controller 50 is also connected to receive a contact detection signal from detection subsystem 22 . Further, the logic controller may be configured to receive inputs from other sources (not shown) such as blade motion sensors, workpiece sensors, etc. In any event, the logic controller is configured to control operative structure 12 in response to the user's inputs through instruments 48 .
- control subsystem 26 Various exemplary embodiments and implementations of control subsystem 26 are described in more detail in U.S. Provisional Patent Application Ser. No. 60/225,059, filed Aug. 14, 2000, entitled “Logic Control For Fast Acting Safety System,” and U.S. Provisional Patent Application Ser. No. 60/225,094, filed Aug. 14, 2000, entitled “Motion Detecting System For Use In Safety System For Power Equipment,” the disclosures of which are herein incorporated by reference.
- brake mechanism 28 includes a pawl 60 mounted adjacent the edge of blade 40 and selectively moveable to engage and grip the teeth of the blade.
- Pawl 60 may be constructed of any suitable material adapted to engage and stop the blade.
- the pawl may be constructed of a relatively high strength thermoplastic material such as polycarbonate, ultrahigh molecular weight polyethylene (UHMW) or Acrylonitrile Butadiene Styrene (ABS), etc., or a metal such as aluminum, etc. It will be appreciated that the construction of pawl 60 will vary depending on the configuration of blade 40 . In any event, the pawl is urged into the blade by a biasing mechanism in the form of a spring 66 .
- pawl 60 is pivoted into the teeth of blade 40 . It should be understood that sliding or rotary movement of pawl 60 may also be used.
- the spring is adapted to urge pawl 60 into the teeth of the blade with sufficient force to grip the blade and quickly bring it to a stop.
- the pawl is held away from the edge of the blade by a restraining mechanism in the form of a fusible member 70 .
- the fusible member is constructed of a suitable material adapted to restrain the pawl against the bias of spring 66 , and also adapted to melt under a determined electrical current density. Examples of suitable materials for fusible member 70 include NiChrome wire, stainless steel wire, etc.
- the fusible member is connected between the pawl and a contact mount 72 .
- member 70 holds the pawl relatively close to the edge of the blade to reduce the distance the pawl must travel to engage the blade. Positioning the pawl relatively close to the edge of the blade reduces the time required for the pawl to engage and stop the blade.
- the pawl is held approximately 1/32-inch to 1 ⁇ 4-inch from the edge of the blade by fusible member 70 , however other pawl-to-blade spacings may also be used within the scope of the invention.
- Pawl 60 is released from its unactuated, or cocked, position to engage blade 40 by a release mechanism in the form of a firing subsystem 76 .
- the firing subsystem is coupled to contact mount 72 , and is configured to melt fusible member 70 by passing a surge of electrical current through the fusible member.
- Firing subsystem 76 is coupled to logic controller 50 and activated by a signal from the logic controller. When the logic controller receives a contact detection signal from detection subsystem 22 , the logic controller sends an activation signal to firing subsystem 76 , which melts fusible member 70 , thereby releasing the pawl to stop the blade.
- reaction subsystem 24 are described in more detail in U.S. Provisional Patent Application Ser. No.
- safety system 18 includes a replaceable cartridge 80 having a housing 82 .
- Pawl 60 , spring 66 , fusible member 70 and contact mount 72 are all mounted within housing 82 .
- other portions of safety system 18 may be mounted within the housing.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- General Engineering & Computer Science (AREA)
- Sawing (AREA)
Abstract
A saw with a safety system is disclosed. The safety system includes a detection system adapted to detect contact between a person and a blade while the blade is moving. The safety system further includes a brake system adapted to engage the blade and to stop the blade when the detection system detects contact between the person and the blade.
Description
- This application is a continuation of U.S. patent application Ser. No. 10/785,361, issuing as U.S. Pat. No. 6,997,090 on Feb. 14, 2006, which is a continuation of U.S. patent application Ser. No. 10/215,929, filed Aug. 9, 2002, which claimed the benefit of and priority from U.S. Provisional Patent Application Ser. No. 60/312,141, filed Aug. 13, 2001. All of the above applications are hereby incorporated by reference in their entirety for all purposes.
- Beginning with the industrial revolution and continuing to the present, mechanized equipment has allowed workers to produce goods with greater speed and less effort than possible with manually-powered tools. Unfortunately, the power and high operating speeds of mechanized equipment creates a risk for those operating such machinery. Each year thousands of people are maimed or killed by accidents involving power equipment.
- As might be expected, many systems have been developed to minimize the risk of injury when using power equipment. Probably the most common safety feature is a guard that physically blocks an operator from making contact with dangerous components of machinery, such as belts, shafts or blades. In many cases, guards are effective to reduce the risk of injury, however, there are many instances where the nature of the operations to be performed precludes using a guard that completely blocks access to hazardous machine parts.
- Various systems have been proposed to prevent accidental injury where guards cannot effectively be employed. For instance, U.S. Pat. Nos. 941,726, 2,978,084, 3,011,610, 3,047,116, 4,195,722 and 4,321,841, the disclosures of which are incorporated herein by reference, all disclose safety systems for use with power presses. These systems utilize cables attached to the wrists of the operator that either pull back a user's hands from the work zone upon operation or prevent operation until the user's hands are outside the danger zone. U.S. Pat. Nos. 3,953,770, 4,075,961, 4,470,046, 4,532,501 and 5,212,621, the disclosures of which are incorporated herein by reference, disclose radio-frequency safety systems which utilize radio-frequency signals to detect the presence of a user's hand in a dangerous area of the machine and thereupon prevent or interrupt operation of the machine.
- U.S. Pat. Nos. 4,959,909, 5,025,175, 5,122,091, 5,198,702, 5,201,684, 5,272,946, and 5,510,685 disclose safety systems for use with meat-skinning equipment, and are incorporated herein by reference. These systems interrupt or reverse power to the motor, or disengage a clutch, upon contact with a user's hand by any dangerous portion of the machine. Typically, contact between the user and the machine is detected by monitoring for electrical contact between a fine wire mesh in a glove worn by the user and some metal component in the dangerous area of the machine. Although such systems are suitable for use with meat skinning machines, they are relatively slow to stop the motion of the cutting element because they rely on the operation of solenoids or must overcome the inertia of the motor. However, because these systems operate at relatively low speeds, the blade does not need to be stopped rapidly to prevent serious injury to the user.
- U.S. Pat. Nos. 3,785,230 and 4,026,177, the disclosures of which are herein incorporated by reference, disclose a safety system for use on circular saws to stop the blade when a user's hand approaches the blade. The system uses the blade as an antenna in an electromagnetic proximity detector to detect the approach of a user's hand prior to actual contact with the blade. Upon detection of a user's hand, the system engages a brake using a standard solenoid. Unfortunately, such a system is prone to false triggers and is relatively slow acting because of the solenoid. U.S. Pat. No. 4,117,752, which is herein incorporated by reference, discloses a similar braking system for use with a band saw, where the brake is triggered by actual contact between the user's hand and the blade. However, the system described for detecting blade contact does not appear to be functional to accurately and reliably detect contact. Furthermore, the system relies on standard electromagnetic brakes operating off of line voltage to stop the blade and pulleys of the band saw. It is believed that such brakes would take 50 ms-1 s to stop the blade. Therefore, the system is too slow to stop the blade quickly enough to avoid serious injury.
- None of these existing systems have operated with sufficient speed and/or reliability to prevent serious injury with many types of commonly used power tools. Although proximity-type sensors can be used with some equipment to increase the time available to stop the moving pieces, in many cases the user's hands must be brought into relatively close proximity to the cutting element in the normal course of operation. For example, many types of woodworking equipment require that the user's hands pass relatively close to the cutting tools. As a result, existing proximity-type sensors, which are relatively imprecise, have not proven effective with this type of equipment. Even where proximity sensors are practical, existing brake systems have not operated quickly enough to prevent serious injury in many cases.
- In equipment where proximity-type detection have not proven effective, the cutting tool must stop very quickly in the event of user contact to avoid serious injury. By way of example, a user may feed a piece of wood through a table saw at a rate of approximately one foot per second. Assuming an average reaction time of approximately one-tenth of a second, the hand may have moved well over an inch before the user even detects the contact. This distance is more than sufficient to result in the loss of several digits, severing of vital vessels and tendons, or even complete severing of a hand. If a brake is triggered immediately upon contact with the saw's blade, the blade must be stopped within approximately one-hundredth of a second to limit the depth of injury to one-eighth of an inch. Standard solenoids or other electromagnetic devices are generally not designed to act in this time scale, particularly where significant force must be generated. For instance, in the case of solenoids or electromagnetic brakes that operate on 60 hz electrical power, it is possible that the power line will be at a phase that has low voltage at the time the brake is triggered and several milliseconds may elapse before the voltage reaches a sufficient level even to begin physical displacement of the brake, much less achieve a complete stoppage of the blade or cutting tool.
-
FIG. 1 is a schematic block diagram of a machine with a fast-acting safety system according to the present invention. -
FIG. 2 is a schematic diagram of an exemplary safety system in the context of a machine having a circular blade. - A machine according to the present invention is shown schematically in
FIG. 1 and indicated generally at 10.Machine 10 may be any of a variety of different machines adapted for cutting workpieces, such as wood, including a table saw, miter saw (chop saw), radial arm saw, circular saw, band saw, jointer, planer, etc.Machine 10 includes anoperative structure 12 having acutting tool 14 and amotor assembly 16 adapted to drive the cutting tool.Machine 10 also includes asafety system 18 configured to minimize the potential of a serious injury to aperson using machine 10.Safety system 18 is adapted to detect the occurrence of one or more dangerous conditions during use ofmachine 10. If such a dangerous condition is detected,safety system 18 is adapted to engageoperative structure 12 to limit any injury to the user caused by the dangerous condition. -
Machine 10 also includes asuitable power source 20 to provide power tooperative structure 12 andsafety system 18.Power source 20 may be an external power source such as line current, or an internal power source such as a battery. Alternatively,power source 20 may include a combination of both external and internal power sources. Furthermore,power source 20 may include two or more separate power sources, each adapted to power different portions ofmachine 10. - It will be appreciated that
operative structure 12 may take any one of many different forms, depending on the type ofmachine 10. For example,operative structure 12 may include a stationary housing configured to supportmotor assembly 16 in driving engagement withcutting tool 14. Alternatively,operative structure 12 may include a movable structure configured to carry cuttingtool 14 between multiple operating positions. As a further alternative,operative structure 12 may include one or more transport mechanisms adapted to convey a workpiece toward and/or away from cuttingtool 14. -
Motor assembly 16 includes one or more motors adapted to drive cuttingtool 14. The motors may be either directly or indirectly coupled to the cutting tool, and may also be adapted to drive workpiece transport mechanisms. Cuttingtool 14 typically includes one or more blades or other suitable cutting implements that are adapted to cut or remove portions from the workpieces. The particular form of cuttingtool 14 will vary depending upon the various embodiments ofmachine 10. For example, in table saws, miter saws, circular saws and radial arm saws, cuttingtool 14 will typically include one or more circular rotating blades having a plurality of teeth disposed along the perimetrical edge of the blade. For a jointer or planer, the cutting tool typically includes a plurality of radially spaced-apart blades. For a band saw, the cutting tool includes an elongate, circuitous tooth-edged band. -
Safety system 18 includes adetection subsystem 22, areaction subsystem 24 and acontrol subsystem 26.Control subsystem 26 may be adapted to receive inputs from a variety of sources includingdetection subsystem 22,reaction subsystem 24,operative structure 12 andmotor assembly 16. The control subsystem may also include one or more sensors adapted to monitor selected parameters ofmachine 10. In addition,control subsystem 26 typically includes one or more instruments operable by a user to control the machine. The control subsystem is configured to controlmachine 10 in response to the inputs it receives. -
Detection subsystem 22 is configured to detect one or more dangerous, or triggering, conditions during use ofmachine 10. For example, the detection subsystem may be configured to detect that a portion of the user's body is dangerously close to, or in contact with, a portion of cuttingtool 14. As another example, the detection subsystem may be configured to detect the rapid movement of a workpiece due to kickback by the cutting tool, such as is described in U.S. Provisional Patent Application Ser. No. 60/182,866, filed Feb. 16, 2000, and U.S. Pat. No. 4,267,914, the disclosures of which are herein incorporated by reference. In some embodiments,detection subsystem 22 may informcontrol subsystem 26 of the dangerous condition, which then activatesreaction subsystem 24. In other embodiments, the detection subsystem may be adapted to activate the reaction subsystem directly. - Once activated in response to a dangerous condition,
reaction subsystem 24 is configured to engageoperative structure 12 quickly to prevent serious injury to the user. It will be appreciated that the particular action to be taken byreaction subsystem 24 will vary depending on the type ofmachine 10 and/or the dangerous condition that is detected. For example,reaction subsystem 24 may be configured to do one or more of the following: stop the movement of cuttingtool 14,disconnect motor assembly 16 frompower source 20, place a barrier between the cutting tool and the user, or retract the cutting tool from its operating position, etc. The reaction subsystem may be configured to take a combination of steps to protect the user from serious injury. Placement of a barrier between the cutting tool and teeth is described in more detail in U.S. Provisional Patent Application Ser. No. 60/225,206, filed Aug. 14, 2000, entitled “Cutting Tool Safety System,” the disclosure of which is herein incorporated by reference. Retraction of the cutting tool from its operating position and/or the stopping of translational motion of the cutting tool are described in more detail in the following U.S. Provisional Patent Applications, all the disclosures of which are herein incorporated by reference: Ser. No. 60/225,089, filed Aug. 14, 2000, entitled “Retraction System For Use In Power Equipment,” Ser. No. 60/270,941, filed Feb. 22, 2001, entitled “Power Saw with Improved Safety System,” Ser. No. 60/270,942, filed Feb. 22, 2001, entitled “Miter Saw with Improved Safety System,” Ser. No. 60/273,177, filed Mar. 2, 2001, entitled “Table Saw With Improved Safety System,” Ser. No. 60/273,178, filed Mar. 2, 2001, entitled “Miter Saw with Improved Safety System,” Ser. No. 60/273,902, filed Mar. 6, 2001, entitled “Miter Saw with Improved Safety System,” Ser. No. 60/275,594, filed Mar. 13, 2001, entitled “Miter Saw with Improved Safety System,” Ser. No. 60/275,595, filed Mar. 13, 2001, entitled “Safety Systems for Power Equipment,” Ser. No. 60/279,313, filed Mar. 27, 2001, entitled “Miter Saw with Improved Safety System,” and Ser. No. 60/292,081, filed May 17, 2001, entitled “Translation Stop for Use in Power Equipment.” - The configuration of
reaction subsystem 24 typically will vary depending on which action(s) are taken. In the exemplary embodiment depicted inFIG. 1 ,reaction subsystem 24 is configured to stop the movement of cuttingtool 14 and includes abrake mechanism 28, abiasing mechanism 30, a restrainingmechanism 32, and arelease mechanism 34.Brake mechanism 28 is adapted to engageoperative structure 12 under the urging of biasingmechanism 30. During normal operation ofmachine 10, restrainingmechanism 32 holds the brake mechanism out of engagement with the operative structure. However, upon receipt of an activation signal byreaction subsystem 24, the brake mechanism is released from the restraining mechanism byrelease mechanism 34, whereupon, the brake mechanism quickly engages at least a portion of the operative structure to bring the cutting tool to a stop. - It will be appreciated by those of skill in the art that the exemplary embodiment depicted in
FIG. 1 and described above may be implemented in a variety of ways depending on the type and configuration ofoperative structure 12. Turning attention toFIG. 2 , one example of the many possible implementations ofsafety system 18 is shown.System 18 is configured to engage an operative structure having a cutting tool in the form of acircular blade 40 mounted on a rotating shaft orarbor 42.Blade 40 includes a plurality of cutting teeth (not shown) disposed around the outer edge of the blade. As described in more detail below,braking mechanism 28 is adapted to engage the teeth ofblade 40 and stop the rotation of the blade. U.S. Provisional Patent Application Ser. No. 60/225,210, filed Aug. 14, 2000, entitled “Translation Stop For Use In Power Equipment,” and U.S. Provisional Patent Application Ser. No. 60/233,459, filed Sep. 18, 2000, entitled “Translation Stop For Use In Power Equipment,” the disclosures of which are herein incorporated by reference, describe other systems for stopping the movement of the cutting tool. Although the embodiment depicted inFIGS. 1 and 2 schematically illustratemachine 10 as a generic woodworking machine, it will be appreciated thatsafety system 18 may be incorporated into virtually any specific type of woodworking machine. For example, the following U.S. Provisional Patent Applications, the disclosures of which are herein incorporated by reference, describesafety system 18 in the context of various specific types of machines such as table saws, miter saws, radial arm saws, band saws, pneumatic up-cut saws, routers, etc.: U.S. Provisional Patent Application Ser. No. 60/225,058, filed Aug. 14, 2000, entitled “Table Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/225,057, filed Aug. 14, 2000, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/233,459, filed Sep. 18, 2000, entitled “Translation Stop For Use In Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/270,941, filed Feb. 22, 2001, entitled “Power Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/270,942, filed Feb. 22, 2001, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/273,177, filed Mar. 2, 2001, entitled “Fable Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/273,178, filed Mar. 2, 2001, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/273,902, filed Mar. 6, 2001, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/275,594, filed Mar. 13, 2001, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/275,595, filed Mar. 13, 2001, entitled “Safety Systems For Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/279,313, filed Mar. 27, 2001, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/292,081, filed May 17, 2001, entitled “Translation Stop For Use In Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/292,100, filed May 17, 2001, entitled “Band Saw with Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/298,207, filed Jun. 13, 2001, entitled “Apparatus And Method For Detecting Dangerous Conditions In Power Equipment,” and U.S. Provisional Patent Application Ser. No. 60/306,202, filed Jul. 18, 2001, entitled “Router With Improved Safety System.” - In the exemplary implementation,
detection subsystem 22 is adapted to detect the dangerous condition of the user coming into contact withblade 40. The detection subsystem includes a sensor assembly, such ascontact detection plates subsystem 26 when contact between the user and the blade is detected. Various exemplary embodiments and implementations ofdetection subsystem 22 are described in more detail in U.S. Provisional Patent Application Ser. No. 60/225,200, filed Aug. 14, 2000, entitled “Contact Detection System For Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/225,211, filed Aug. 14, 2000, entitled “Apparatus And Method For Detecting Dangerous Conditions In Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/270,011, filed Feb. 20, 2001, entitled “Contact Detection System for Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/292,100, filed May 17, 2001, entitled “Band Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/298,207, filed Jun. 13, 2001, entitled “Apparatus And Method For Detecting Dangerous Conditions In Power Equipment,” and U.S. Provisional Patent Application Ser. No. 60/302,937, filed Jul. 2, 2001, entitled “Discrete Proximity Detection System,” the disclosures of which are herein incorporated by reference. -
Control subsystem 26 includes one ormore instruments 48 that are operable by a user to control the motion ofblade 40.Instruments 48 may include start/stop switches, speed controls, direction controls, etc.Control subsystem 26 also includes alogic controller 50 connected to receive the user's inputs viainstruments 48.Logic controller 50 is also connected to receive a contact detection signal fromdetection subsystem 22. Further, the logic controller may be configured to receive inputs from other sources (not shown) such as blade motion sensors, workpiece sensors, etc. In any event, the logic controller is configured to controloperative structure 12 in response to the user's inputs throughinstruments 48. However, upon receipt of a contact detection signal fromdetection subsystem 22, the logic controller overrides the control inputs from the user and activatesreaction subsystem 24 to stop the motion of the blade. Various exemplary embodiments and implementations ofcontrol subsystem 26 are described in more detail in U.S. Provisional Patent Application Ser. No. 60/225,059, filed Aug. 14, 2000, entitled “Logic Control For Fast Acting Safety System,” and U.S. Provisional Patent Application Ser. No. 60/225,094, filed Aug. 14, 2000, entitled “Motion Detecting System For Use In Safety System For Power Equipment,” the disclosures of which are herein incorporated by reference. - In the exemplary implementation,
brake mechanism 28 includes apawl 60 mounted adjacent the edge ofblade 40 and selectively moveable to engage and grip the teeth of the blade.Pawl 60 may be constructed of any suitable material adapted to engage and stop the blade. As one example, the pawl may be constructed of a relatively high strength thermoplastic material such as polycarbonate, ultrahigh molecular weight polyethylene (UHMW) or Acrylonitrile Butadiene Styrene (ABS), etc., or a metal such as aluminum, etc. It will be appreciated that the construction ofpawl 60 will vary depending on the configuration ofblade 40. In any event, the pawl is urged into the blade by a biasing mechanism in the form of aspring 66. In the illustrative embodiment shown inFIG. 2 ,pawl 60 is pivoted into the teeth ofblade 40. It should be understood that sliding or rotary movement ofpawl 60 may also be used. The spring is adapted to urgepawl 60 into the teeth of the blade with sufficient force to grip the blade and quickly bring it to a stop. - The pawl is held away from the edge of the blade by a restraining mechanism in the form of a
fusible member 70. The fusible member is constructed of a suitable material adapted to restrain the pawl against the bias ofspring 66, and also adapted to melt under a determined electrical current density. Examples of suitable materials forfusible member 70 include NiChrome wire, stainless steel wire, etc. The fusible member is connected between the pawl and acontact mount 72. Preferablymember 70 holds the pawl relatively close to the edge of the blade to reduce the distance the pawl must travel to engage the blade. Positioning the pawl relatively close to the edge of the blade reduces the time required for the pawl to engage and stop the blade. Typically, the pawl is held approximately 1/32-inch to ¼-inch from the edge of the blade byfusible member 70, however other pawl-to-blade spacings may also be used within the scope of the invention. -
Pawl 60 is released from its unactuated, or cocked, position to engageblade 40 by a release mechanism in the form of afiring subsystem 76. The firing subsystem is coupled to contactmount 72, and is configured to meltfusible member 70 by passing a surge of electrical current through the fusible member.Firing subsystem 76 is coupled tologic controller 50 and activated by a signal from the logic controller. When the logic controller receives a contact detection signal fromdetection subsystem 22, the logic controller sends an activation signal to firingsubsystem 76, which meltsfusible member 70, thereby releasing the pawl to stop the blade. Various exemplary embodiments and implementations ofreaction subsystem 24 are described in more detail in U.S. Provisional Patent Application Ser. No. 60/225,056, filed Aug. 14, 2000, entitled “Firing Subsystem For Use In Fast Acting Safety System,” U.S. Provisional Patent Application Ser. No. 60/225,170, filed Aug. 14, 2000, entitled “Spring-Biased Brake Mechanism for Power Equipment,” and U.S. Provisional Patent Application Ser. No. 60/225,169, filed Aug. 14, 2000, entitled “Brake Mechanism For Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/279,313, filed Mar. 27, 2001, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/292,081, filed May 17, 2001, entitled “Translation Stop For Use In Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/292,100, filed May 17, 2001, entitled “Band Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/302,916, filed Jul. 3, 2001, entitled “Actuators For Use With Fast-Acting Safety Systems,” and U.S. Provisional Patent Application Ser. No. 60/307,756, filed Jul. 25, 2001, entitled “Actuators For Use With Fast-Acting Safety Systems,” the disclosures of which are herein incorporated by reference. - It will be appreciated that activation of the brake mechanism will require the replacement of one or more portions of
safety system 18. For example,pawl 60 andfusible member 70 typically must be replaced before the safety system is ready to be used again. Thus, it may be desirable to construct one or more portions ofsafety system 18 in a cartridge that can be easily replaced. For example, in the exemplary implementation depicted inFIG. 2 ,safety system 18 includes areplaceable cartridge 80 having ahousing 82.Pawl 60,spring 66,fusible member 70 and contact mount 72 are all mounted withinhousing 82. Alternatively, other portions ofsafety system 18 may be mounted within the housing. In any event, after the reaction system has been activated, the safety system can be reset by replacingcartridge 80. The portions ofsafety system 18 not mounted within the cartridge may be replaced separately or reused as appropriate. Various exemplary embodiments and implementations of a safety system using a replaceable cartridge are described in more detail in U.S. Provisional Patent Application Ser. No. 60/225,201, filed Aug. 14, 2000, entitled “Replaceable Brake Mechanism For Power Equipment,” U.S. Provisional Patent Application Ser. No. 60/225,212, filed Aug. 14, 2000, entitled “Brake Positioning System,” U.S. Provisional Patent Application Ser. No. 60/279,313, filed Mar. 27, 2001, entitled “Miter Saw With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/306,202, filed Jul. 18, 2001, entitled “Router With Improved Safety System,” U.S. Provisional Patent Application Ser. No. 60/302,916, filed Jul. 3, 2001, entitled “Actuators For Use With Fast-Acting Safety Systems,” and U.S. Provisional Patent Application Ser. No. 60/307,756, filed Jul. 25, 2001, entitled “Actuators For Use With Fast-Acting Safety Systems,” the disclosures of which are herein incorporated by reference. - Additional variations and modifications of
safety system 18 are described in U.S. Provisional Patent Application Ser. Nos. 60/182,866, filed Feb. 16, 2000, and 60/157,340, filed Oct. 1, 1999, both entitled “Fast-Acting Safety Stop,” the disclosures of which are herein incorporated by reference. - It is believed that the disclosure set forth above encompasses multiple distinct inventions with independent utility. While each of these inventions has been disclosed in its preferred form, the specific embodiments thereof as disclosed and illustrated herein are not to be considered in a limiting sense as numerous variations are possible. The subject matter of the inventions includes all novel and non-obvious combinations and sub-combinations of the various elements, features, functions and/or properties disclosed herein. No single feature, function, element or property of the disclosed embodiments is essential to all of the disclosed inventions. Similarly, where the claims recite “a” or “a first” element or the equivalent thereof, such claims should be understood to include incorporation of one or more such elements, neither requiring nor excluding two or more such elements.
- It is believed that the following claims particularly point out certain combinations and sub-combinations that are directed to one of the disclosed inventions and are novel and non-obvious. Inventions embodied in other combinations and sub-combinations of features, functions, elements and/or properties may be claimed through amendment of the present claims or presentation of new claims in this or a related application. Such amended or new claims, whether they are directed to a different invention or directed to the same invention, whether different, broader, narrower or equal in scope to the original claims, are also regarded as included within the subject matter of the inventions of the present disclosure.
Claims (20)
1. A method of operating a saw comprising:
providing a blade configured to move to cut a work piece, where the blade includes a cutting edge;
providing a motor adapted to move the blade;
providing a detection system adapted to detect a dangerous condition between a person and the blade while the blade is moving and to distinguish that dangerous condition from proximity between green wood and the blade by imparting a signal to the blade and monitoring that signal for a predetermined change indicative of the dangerous condition;
providing a reaction system adapted to take some action to mitigate possible injury if the detection system detects the dangerous condition; and
moving the blade to cut a work piece while the detection and reaction systems are active.
2. The method of claim 1 , where the dangerous condition is contact between a person and the blade.
3. The method of claim 1 , where the dangerous condition is proximity between a person and the blade.
4. The method of claim 1 , where the predetermined change indicative of the dangerous condition is a predetermined rate of change.
5. The method of claim 1 , where the reaction system includes a retraction mechanism to retract the blade.
6. The method of claim 1 , where the reaction system includes a brake to decelerate the blade.
7. The method of claim 6 , where the brake includes a pawl and a system to move the pawl into contact with the blade.
8. The method of claim 7 , where the system to move the pawl into contact with the blade causes the pawl to contact the blade within 10 milliseconds after the detection system detects the dangerous condition.
9. The method of claim 1 , where the saw is a table saw.
10. The method of claim 1 , where the saw is a miter saw.
11. The method of claim 1 , where the saw is a hand-held circular saw.
12. A method of operating a saw comprising:
providing a blade configured to move to cut a work piece, where the blade includes a cutting edge;
providing a motor adapted to move the blade;
providing a detection system adapted to detect a dangerous condition between a person and the blade while the blade is moving and to distinguish that dangerous condition from contact between green wood and the blade by imparting a signal to the blade and monitoring that signal for a predetermined change indicative of the dangerous condition;
providing a reaction system adapted to take some action to mitigate possible injury if the detection system detects the dangerous condition; and
moving the blade to cut a work piece while the detection and reaction systems are active.
13. The method of claim 12 , where the dangerous condition is contact between a person and the blade.
14. The method of claim 12 , where the dangerous condition is proximity between a person and the blade.
15. The method of claim 12 , where the predetermined change indicative of the dangerous condition is a predetermined rate of change.
16. The method of claim 12 , where the reaction system includes a retraction mechanism to retract the blade.
17. The method of claim 12 , where the reaction system includes a brake to decelerate the blade.
18. The method of claim 12 , where the saw is a table saw.
19. The method of claim 12 , where the saw is a miter saw.
20. The method of claim 12 , where the saw is a hand-held circular saw.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/353,423 US20060123960A1 (en) | 2001-08-13 | 2006-02-13 | Safety systems for power equipment |
US11/401,050 US7788999B2 (en) | 1999-10-01 | 2006-04-10 | Brake mechanism for power equipment |
US11/401,774 US7525055B2 (en) | 1999-10-01 | 2006-04-11 | Switch box for power tools with safety systems |
US11/445,548 US7347131B2 (en) | 1999-10-01 | 2006-06-02 | Miter saw with improved safety system |
US11/542,938 US20070028733A1 (en) | 1999-10-01 | 2006-10-02 | Safety methods for use in power equipment |
US12/807,146 US8291797B2 (en) | 1999-10-01 | 2010-08-27 | Table saw with improved safety system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US31214101P | 2001-08-13 | 2001-08-13 | |
US10/215,929 US20030037651A1 (en) | 2001-08-13 | 2002-08-09 | Safety systems for power equipment |
US10/785,361 US6997090B2 (en) | 2001-08-13 | 2004-02-23 | Safety systems for power equipment |
US11/353,423 US20060123960A1 (en) | 2001-08-13 | 2006-02-13 | Safety systems for power equipment |
Related Parent Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/785,361 Continuation US6997090B2 (en) | 1999-10-01 | 2004-02-23 | Safety systems for power equipment |
US11/348,580 Continuation US20060123964A1 (en) | 1999-10-01 | 2006-02-06 | Table saw with improved safety system |
US11/395,502 Continuation US20060219076A1 (en) | 1999-10-01 | 2006-03-31 | Table saw throat plates and table saws including the same |
Related Child Applications (6)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/348,580 Continuation US20060123964A1 (en) | 1999-10-01 | 2006-02-06 | Table saw with improved safety system |
US11/395,502 Continuation US20060219076A1 (en) | 1999-10-01 | 2006-03-31 | Table saw throat plates and table saws including the same |
US11/401,050 Continuation US7788999B2 (en) | 1999-10-01 | 2006-04-10 | Brake mechanism for power equipment |
US11/401,774 Continuation US7525055B2 (en) | 1999-10-01 | 2006-04-11 | Switch box for power tools with safety systems |
US11/445,548 Continuation US7347131B2 (en) | 1999-10-01 | 2006-06-02 | Miter saw with improved safety system |
US11/542,938 Continuation US20070028733A1 (en) | 1999-10-01 | 2006-10-02 | Safety methods for use in power equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060123960A1 true US20060123960A1 (en) | 2006-06-15 |
Family
ID=26910503
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/215,929 Abandoned US20030037651A1 (en) | 1999-10-01 | 2002-08-09 | Safety systems for power equipment |
US10/785,361 Expired - Lifetime US6997090B2 (en) | 1999-10-01 | 2004-02-23 | Safety systems for power equipment |
US11/353,423 Abandoned US20060123960A1 (en) | 1999-10-01 | 2006-02-13 | Safety systems for power equipment |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/215,929 Abandoned US20030037651A1 (en) | 1999-10-01 | 2002-08-09 | Safety systems for power equipment |
US10/785,361 Expired - Lifetime US6997090B2 (en) | 1999-10-01 | 2004-02-23 | Safety systems for power equipment |
Country Status (1)
Country | Link |
---|---|
US (3) | US20030037651A1 (en) |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020020261A1 (en) * | 2000-08-14 | 2002-02-21 | Gass Stephen F. | Replaceable brake mechanism for power equipment |
US20050039822A1 (en) * | 2003-08-20 | 2005-02-24 | Gass Stephen F. | Woodworking machines with overmolded arbors |
US20080245200A1 (en) * | 2005-07-18 | 2008-10-09 | Bladestop Pty Limited | Electric Saw with Operator Protection System |
US7628101B1 (en) | 2006-03-13 | 2009-12-08 | Power Tool Institute | Pyrotechnic drop mechanism for power tools |
US20100023137A1 (en) * | 2003-12-31 | 2010-01-28 | Gass Stephen F | Detection systems for power equipment |
US20100059144A1 (en) * | 2008-09-08 | 2010-03-11 | Power Tool Institute | Detection system for power tool |
US7712403B2 (en) | 2001-07-03 | 2010-05-11 | Sd3, Llc | Actuators for use in fast-acting safety systems |
US7788999B2 (en) | 1999-10-01 | 2010-09-07 | Sd3, Llc | Brake mechanism for power equipment |
US20100269654A1 (en) * | 2009-04-28 | 2010-10-28 | Needel Gregory E | Dust Collection System for a Power Tool |
US7827890B2 (en) | 2004-01-29 | 2010-11-09 | Sd3, Llc | Table saws with safety systems and systems to mount and index attachments |
US7827893B2 (en) | 2003-12-31 | 2010-11-09 | Sd3, Llc | Elevation mechanism for table saws |
US7832314B2 (en) | 2000-08-14 | 2010-11-16 | Sd3, Llc | Brake positioning system |
US7836804B2 (en) | 2003-08-20 | 2010-11-23 | Sd3, Llc | Woodworking machines with overmolded arbors |
US7895927B2 (en) | 1999-10-01 | 2011-03-01 | Sd3, Llc | Power equipment with detection and reaction systems |
US7921754B2 (en) | 2000-08-14 | 2011-04-12 | Sd3, Llc | Logic control for fast-acting safety system |
US8061245B2 (en) | 2000-09-29 | 2011-11-22 | Sd3, Llc | Safety methods for use in power equipment |
US8122798B1 (en) | 2008-11-19 | 2012-02-28 | Power Tool Institute | Power cutting tool with proximity sensing system |
US8534174B2 (en) | 2010-09-27 | 2013-09-17 | Power Tool Institute | Pyrotechnic actuator and power cutting tool with safety reaction system having such pyrotechnic actuator |
US8919231B2 (en) | 2008-11-19 | 2014-12-30 | Power Tool Institute | Safety mechanisms for power tools |
US11085582B2 (en) | 2017-08-30 | 2021-08-10 | Milwaukee Electric Tool Corporation | Power tool having object detection |
Families Citing this family (71)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7377199B2 (en) | 2000-09-29 | 2008-05-27 | Sd3, Llc | Contact detection system for power equipment |
US20020017179A1 (en) * | 2000-08-14 | 2002-02-14 | Gass Stephen F. | Miter saw with improved safety system |
US7308843B2 (en) * | 2000-08-14 | 2007-12-18 | Sd3, Llc | Spring-biased brake mechanism for power equipment |
US8065943B2 (en) | 2000-09-18 | 2011-11-29 | Sd3, Llc | Translation stop for use in power equipment |
US9927796B2 (en) | 2001-05-17 | 2018-03-27 | Sawstop Holding Llc | Band saw with improved safety system |
US20050139056A1 (en) * | 2003-12-31 | 2005-06-30 | Gass Stephen F. | Fences for table saws |
US9724840B2 (en) * | 1999-10-01 | 2017-08-08 | Sd3, Llc | Safety systems for power equipment |
US8459157B2 (en) | 2003-12-31 | 2013-06-11 | Sd3, Llc | Brake cartridges and mounting systems for brake cartridges |
US20030056853A1 (en) | 2001-09-21 | 2003-03-27 | Gass Stephen F. | Router with improved safety system |
US20050041359A1 (en) * | 2003-08-20 | 2005-02-24 | Gass Stephen F. | Motion detecting system for use in a safety system for power equipment |
US6826988B2 (en) | 2000-09-29 | 2004-12-07 | Sd3, Llc | Miter saw with improved safety system |
US6813983B2 (en) | 2000-09-29 | 2004-11-09 | Sd3, Llc | Power saw with improved safety system |
AU2002326360A1 (en) * | 2001-07-11 | 2003-01-29 | Black And Decker Inc. | Power tool safety mechanisms |
DE10261791A1 (en) * | 2002-12-23 | 2004-07-15 | Robert Bosch Gmbh | Device for protection against accidental contact and method for protecting against contact with a moving part |
US20040194594A1 (en) * | 2003-01-31 | 2004-10-07 | Dils Jeffrey M. | Machine safety protection system |
US6853300B2 (en) * | 2003-06-05 | 2005-02-08 | Kuo Lung Kuan | Saw cover safety sensing device |
US7311276B2 (en) * | 2004-09-10 | 2007-12-25 | Fellowes Inc. | Shredder with proximity sensing system |
US7631822B2 (en) | 2004-09-10 | 2009-12-15 | Fellowes Inc. | Shredder with thickness detector |
US7661614B2 (en) * | 2004-09-10 | 2010-02-16 | Fellowes Inc. | Shredder throat safety system |
US7522066B2 (en) * | 2006-02-23 | 2009-04-21 | Rockwell Automation Technologies, Inc. | Systems and methods that evaluate distance to potential hazards utilizing overlapping sensing zones |
US7657814B2 (en) * | 2006-02-23 | 2010-02-02 | Rockwell Automation Technologies, Inc. | Optimizing availability and safety by reconfiguring and auto-adjusting redundancy |
GB2437594B (en) * | 2006-04-24 | 2010-08-11 | Acco Uk Ltd | A shredding machine |
CN2915259Y (en) | 2006-07-14 | 2007-06-27 | 上海震旦办公设备有限公司 | Paper shredder touch safety device |
US8008812B2 (en) | 2006-07-14 | 2011-08-30 | Aurora Office Equipment Co., Ltd. | Paper shredder control system responsive to touch-sensitive element |
US20080053994A1 (en) * | 2006-08-30 | 2008-03-06 | Aurora Office Equipment Co., Ltd. Shanghai | Paper-Breaker Wastebin Structure |
US7757982B2 (en) * | 2006-09-28 | 2010-07-20 | Fellowes, Inc. | Shredder with intelligent activation switch |
US8844696B2 (en) * | 2007-02-20 | 2014-09-30 | Robert Bosch Gmbh | Clutch for injury mitigation system for power tools |
GB2451513B (en) | 2007-08-02 | 2012-04-18 | Acco Uk Ltd | A shredding machine |
DE102008000038A1 (en) * | 2008-01-11 | 2009-07-16 | Robert Bosch Gmbh | contraption |
CN201239643Y (en) | 2008-08-06 | 2009-05-20 | 上海震旦办公设备有限公司 | Full automatic paper crusher without selecting paper |
CN201244502Y (en) | 2008-08-19 | 2009-05-27 | 上海震旦办公设备有限公司 | Structure capable of removing nail of automatic paper crusher |
CN101543799B (en) * | 2009-04-28 | 2012-10-10 | 上海震旦办公设备有限公司 | Novel protector for paper crusher |
CN101543800A (en) * | 2009-05-07 | 2009-09-30 | 上海震旦办公设备有限公司 | Paper jamming prevention protective device of paper shredder |
US8250957B2 (en) * | 2009-08-26 | 2012-08-28 | Robert Bosch Gmbh | Table saw with linkage drop system |
US8186258B2 (en) | 2009-08-26 | 2012-05-29 | Robert Bosch Gmbh | Table saw with actuator reset mechanism |
US8297159B2 (en) * | 2009-08-26 | 2012-10-30 | Robert Bosch Gmbh | Table saw with dropping blade |
US10029386B2 (en) * | 2009-08-26 | 2018-07-24 | Robert Bosch Tool Corporation | Table saw with positive locking mechanism |
US8286537B2 (en) * | 2009-08-26 | 2012-10-16 | Robert Bosch Gmbh | Table saw with pressure operated actuator |
US9079258B2 (en) * | 2009-08-26 | 2015-07-14 | Robert Bosch Gmbh | Table saw with belt stop |
US8316748B2 (en) * | 2009-08-26 | 2012-11-27 | Robert Bosch Gmbh | Table saw with alignment plate |
US8245612B2 (en) * | 2009-08-26 | 2012-08-21 | Robert Bosch Gmbh | Table saw with swing arm support |
US8327744B2 (en) | 2009-08-26 | 2012-12-11 | Robert Bosch Gmbh | Table saw with reset mechanism |
US8210076B2 (en) * | 2009-08-26 | 2012-07-03 | Robert Bosch Gmbh | Table saw with mechanical fuse |
US9969013B2 (en) * | 2009-08-26 | 2018-05-15 | Robert Bosch Tool Corporation | Table saw with actuator module |
US10076796B2 (en) * | 2009-08-26 | 2018-09-18 | Robert Bosch Tool Corporation | Table saw with dust shield |
US8291801B2 (en) * | 2009-08-26 | 2012-10-23 | Robert Bosch Gmbh | Table saw with ratchet mechanism |
US8723468B2 (en) | 2011-04-28 | 2014-05-13 | Aurora Office Equipment Co., Ltd. | Cooled motor |
US8708260B2 (en) | 2011-08-08 | 2014-04-29 | Aurora Office Equipment Co., Ltd. | Depowered standby paper shredder and method |
US9517516B2 (en) | 2013-03-14 | 2016-12-13 | Robert Bosch Tool Corporation | Blade drop power tool with dust management |
US9511429B2 (en) | 2013-03-15 | 2016-12-06 | Robert BoschTool Corporation | Blade drop for power device and method of manufacturing thereof |
US9687922B2 (en) | 2015-03-12 | 2017-06-27 | Robert Bosch Tool Corporation | Power tool with cammed throat plate |
US10213853B2 (en) | 2015-03-12 | 2019-02-26 | Robert Bosch Tool Corporation | Power tool drop arm with offset ribbing |
US9868167B2 (en) | 2015-03-12 | 2018-01-16 | Robert Bosch Tool Corporation | Power tool with drop arm orbit bracket |
US10369642B2 (en) | 2015-03-12 | 2019-08-06 | Robert Bosch Tool Corporation | Power tool with protected circuit board orientation |
US10799964B2 (en) | 2015-03-12 | 2020-10-13 | Robert Bosch Tool Corporation | Table saw with pulley alignment mechanism |
US10758989B2 (en) | 2015-03-12 | 2020-09-01 | Robert Bosch Tool Corporation | System and method for sensing cable fault detection in a saw |
US9914239B2 (en) | 2015-03-12 | 2018-03-13 | Robert Bosch Tool Corporation | User interface system in a table saw |
US10071432B2 (en) | 2015-03-12 | 2018-09-11 | Robert Bosch Tool Corporation | Power tool with arbor lock |
US10821529B2 (en) | 2015-03-12 | 2020-11-03 | Robert Bosch Tool Corporation | Power tool with improved belt tensioning |
US10099399B2 (en) | 2015-03-12 | 2018-10-16 | Robert Bosch Tool Corporation | Object proximity detection in a saw |
US9969015B2 (en) | 2015-03-12 | 2018-05-15 | Robert Bosch Tool Corporation | Power tool with protected coupling plate |
US10105863B2 (en) | 2015-03-12 | 2018-10-23 | Robert Bosch Tool Corporation | System and method for object and operator profiling in an object detection system in a saw |
US10493543B2 (en) | 2015-03-12 | 2019-12-03 | Robert Bosch Tool Corporation | Power tool motor with reduced electrical noise |
US10427227B2 (en) | 2015-03-12 | 2019-10-01 | Robert Bosch Tool Corporation | Drop arm reset method |
US10322522B2 (en) | 2015-03-12 | 2019-06-18 | Robert Bosch Tool Corporation | Electrical configuration for object detection system in a saw |
US9849527B2 (en) | 2015-03-12 | 2017-12-26 | Robert Bosch Tool Corporation | Power tool with lightweight actuator housing |
US10786854B2 (en) * | 2015-03-12 | 2020-09-29 | Robert Bosch Tool Corporation | Table saw with electrically isolated arbor shaft |
US10189098B2 (en) | 2015-03-12 | 2019-01-29 | Robert Bosch Tool Corporation | Diagnostic and maintenance operation for a saw |
US9868166B2 (en) | 2015-03-12 | 2018-01-16 | Robert Bosch Tool Corporation | Power tool with pyrotechnic lockout |
US11603287B2 (en) | 2020-11-19 | 2023-03-14 | Harmar Mobility, Llc | Stairlift overspeed safety systems |
US11505429B2 (en) | 2020-11-19 | 2022-11-22 | Harmar Mobility, Llc | Stairlift overspeed safety systems |
Citations (99)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US146886A (en) * | 1874-01-27 | Improvement in sawing-machines | ||
US162814A (en) * | 1875-05-04 | Improvement in saw-guards | ||
US261090A (en) * | 1882-07-11 | Circular-saw guard | ||
US264412A (en) * | 1882-09-12 | Half to john h | ||
US299480A (en) * | 1884-05-27 | Saw-guard | ||
US302041A (en) * | 1884-07-15 | Saw-guard | ||
US307112A (en) * | 1884-10-28 | Saw-guard | ||
US509253A (en) * | 1893-11-21 | Safety-guard for rip-saws | ||
US545504A (en) * | 1895-09-03 | Saw-guard | ||
US869513A (en) * | 1907-06-17 | 1907-10-29 | Frederick C Pfeil | Saw-guard. |
US941726A (en) * | 1907-10-15 | 1909-11-30 | Charles F Pfalzgraf | Safety trip device for power-operated machines. |
US997720A (en) * | 1909-08-07 | 1911-07-11 | Othon Troupenat | Safety device for saws. |
US1037843A (en) * | 1911-10-30 | 1912-09-10 | David S Ackley | Saw-guard |
US1050649A (en) * | 1910-05-28 | 1913-01-14 | Crescent Machine Company | Saw-guard. |
US1054558A (en) * | 1912-07-29 | 1913-02-25 | Nye Company | Self-adjusting support for circular-saw and shaper guards. |
US1074198A (en) * | 1913-03-21 | 1913-09-30 | Francis Vosburgh Phillips | Saw-guard. |
US1082870A (en) * | 1912-11-20 | 1913-12-30 | John W Humason | Saw-guard. |
US1101515A (en) * | 1913-06-27 | 1914-06-30 | George H Adam | Safety saw-guard. |
US1126970A (en) * | 1913-02-10 | 1915-02-02 | Eastman Kodak Co | Saw-guard. |
US1132129A (en) * | 1914-06-15 | 1915-03-16 | Fred M Stevens | Safety-grip for circular saws. |
US1148169A (en) * | 1913-01-06 | 1915-07-27 | Andrew F Howe | Saw-guard. |
US1154209A (en) * | 1914-08-11 | 1915-09-21 | John L Rushton | Saw-guard. |
US1205246A (en) * | 1913-10-27 | 1916-11-21 | Int Harvester Canada | Shipping-package. |
US1228047A (en) * | 1916-12-18 | 1917-05-29 | Darwin O Reinhold | Self-adjusting spreader for saws. |
US1240430A (en) * | 1916-07-22 | 1917-09-18 | Peter Erickson | Cutter-guard. |
US1244187A (en) * | 1917-02-17 | 1917-10-23 | Warren M Frisbie | Circular-saw guard. |
US1255886A (en) * | 1915-11-23 | 1918-02-12 | Emerald E Jones | Saw-guard. |
US1258961A (en) * | 1916-03-09 | 1918-03-12 | James G Tattersall | Saw-guard and splitter. |
US1311508A (en) * | 1919-07-29 | Planooraph co | ||
US1324136A (en) * | 1919-12-09 | Tool-operating machine | ||
US1381612A (en) * | 1919-10-24 | 1921-06-14 | George A Anderson | Saw-guard |
US1397606A (en) * | 1918-07-29 | 1921-11-22 | Christian N Smith | Safety-shield for circular saws |
US1427005A (en) * | 1919-12-26 | 1922-08-22 | James D Mcmichael | Saw guard |
US1430983A (en) * | 1921-10-05 | 1922-10-03 | Granberg Wilhelm | Guard for sawing machines |
US1450906A (en) * | 1919-07-28 | 1923-04-10 | Charles W Anderson | Power control for saw tables and the like |
US1464924A (en) * | 1922-06-20 | 1923-08-14 | William D Drummond | Saw guard |
US1465224A (en) * | 1921-07-22 | 1923-08-14 | Lantz Joseph Edward | Automatic shield for circular saws |
US1496212A (en) * | 1923-02-06 | 1924-06-03 | James F Sullivan | Circular-saw guard |
US1511797A (en) * | 1924-02-15 | 1924-10-14 | Frank E Berghold | Saw guard |
US1526128A (en) * | 1923-10-20 | 1925-02-10 | Flohr Andrew | Saw guard |
US1527587A (en) * | 1923-12-07 | 1925-02-24 | Hutchinson Frank | Saw guard |
US1551900A (en) * | 1924-12-05 | 1925-09-01 | Robert L Morrow | Safety device |
US1553996A (en) * | 1924-04-19 | 1925-09-15 | Federer Joseph | Safety saw guard |
US1582483A (en) * | 1925-01-13 | 1926-04-27 | Geniah B Runyan | Meat cutter |
US1590988A (en) * | 1924-09-24 | 1926-06-29 | Wheland Company | Combined setwork and recede for sawmill carriages |
US1600604A (en) * | 1926-03-06 | 1926-09-21 | Sorlien Andrew | Board holder for sawing machines |
US1616478A (en) * | 1926-01-19 | 1927-02-08 | Julius C Reiche | Guard for circular saws |
US1640517A (en) * | 1924-04-17 | 1927-08-30 | Paine Lumber Company Ltd | Saw guard |
US1662372A (en) * | 1926-04-26 | 1928-03-13 | Abraham D Ward | Saw guard |
US1701948A (en) * | 1925-04-02 | 1929-02-12 | Crowe Mfg Corp | Portable saw |
US1711490A (en) * | 1927-09-12 | 1929-05-07 | William D Drummond | Saw guard |
US1712828A (en) * | 1927-02-14 | 1929-05-14 | Henry J Klehm | Saw guard |
US1774521A (en) * | 1928-10-31 | 1930-09-02 | Wilbur S Neighbour | Saw guard |
US1807120A (en) * | 1929-03-11 | 1931-05-26 | Hall & Brown Wood Working Mach | Saw |
US1811066A (en) * | 1929-02-23 | 1931-06-23 | Carl E Tannewitz | Sawing machine |
US1879280A (en) * | 1930-08-30 | 1932-09-27 | George V James | Guard for circular saws |
US1896924A (en) * | 1933-02-07 | Table fob saws ob the like | ||
US1902270A (en) * | 1932-06-02 | 1933-03-21 | Delta Mfg Co | Miter gauge |
US1904005A (en) * | 1932-02-03 | 1933-04-18 | Masset Edward | Saw guard |
US1910651A (en) * | 1932-12-05 | 1933-05-23 | Delta Mfg Co | Trunnion table mounting |
US1938548A (en) * | 1933-02-04 | 1933-12-05 | Delts Mfg Company | Machine table extension |
US1938549A (en) * | 1933-07-22 | 1933-12-05 | Delta Mfg Co | Machine table |
US1963688A (en) * | 1933-02-15 | 1934-06-19 | Delta Mfg Co | Hollow fence bar and process of making the same |
US1988102A (en) * | 1932-04-02 | 1935-01-15 | William H Woodward | Circular saw machine |
US1993219A (en) * | 1933-07-12 | 1935-03-05 | Herberts Machinery Company Ltd | Circular saw |
US2007887A (en) * | 1933-09-20 | 1935-07-09 | Delta Mfg Co | Saw guard |
US2010851A (en) * | 1934-07-02 | 1935-08-13 | William D Drummond | Automatic hood guard |
US2020222A (en) * | 1935-04-08 | 1935-11-05 | Delta Mfg Co | Machine table insert |
US2038810A (en) * | 1934-09-06 | 1936-04-28 | Delta Mfg Co | Circular-saw machine |
US2075282A (en) * | 1935-05-27 | 1937-03-30 | Duro Metal Prod Co | Bench saw |
US2095330A (en) * | 1936-07-25 | 1937-10-12 | Duro Metal Prod Co | Bench saw |
US2106288A (en) * | 1934-09-27 | 1938-01-25 | Herbert E Tautz | Circular saw apparatus |
US2106321A (en) * | 1937-02-16 | 1938-01-25 | Guertin Gilles | Saw guard |
US2121069A (en) * | 1937-06-14 | 1938-06-21 | Atlas Press Company | Circular saw |
US2131492A (en) * | 1936-11-28 | 1938-09-27 | Walker Turner Company Inc | Tilting arbor table saw |
US2163320A (en) * | 1937-05-01 | 1939-06-20 | William P Morgan | Sawing appliance |
US2168282A (en) * | 1936-12-18 | 1939-08-01 | Delta Mfg Co | Circular saw |
US2241556A (en) * | 1938-06-20 | 1941-05-13 | Hydraulic Dev Corp Inc | Photoelectrically controlled press |
US2261696A (en) * | 1939-03-15 | 1941-11-04 | Walker Turner Co Inc | Tilting saw |
US2265407A (en) * | 1939-01-25 | 1941-12-09 | Delta Mfg Co | Tilting arbor saw |
US2286589A (en) * | 1940-10-28 | 1942-06-16 | Carl E Tannewitz | Blade grabber for band saws |
US2292872A (en) * | 1940-07-10 | 1942-08-11 | Elwyn A Eastman | Double hinge tilting arbor saw |
US2299262A (en) * | 1940-04-29 | 1942-10-20 | Uremovich Mark | Power-driven bench saw |
US2312118A (en) * | 1940-07-31 | 1943-02-23 | Ray H Neisewander | Adjustable woodworking machine |
US2313686A (en) * | 1941-03-17 | 1943-03-09 | Uremovich Mark | Saw guard |
US2328244A (en) * | 1941-02-24 | 1943-08-31 | William H Woodward | Circular saw machine |
US2352235A (en) * | 1941-09-10 | 1944-06-27 | Delta Mfg Co | Saw guard |
US2377265A (en) * | 1942-01-09 | 1945-05-29 | Gen Motors Corp | Sealed-in regulator |
US2392486A (en) * | 1943-10-20 | 1946-01-08 | Melvin J Larsen | Machine tool |
US2402232A (en) * | 1942-04-20 | 1946-06-18 | Automatic Elect Lab | Automatic telephone system |
US2425331A (en) * | 1945-12-13 | 1947-08-12 | Linzie F Kramer | Guard device for circular-saw table sawing machines |
US2434174A (en) * | 1944-06-19 | 1948-01-06 | Joseph P Morgan | Safety brake for band-saw blades |
US2452589A (en) * | 1943-01-22 | 1948-11-02 | Standard Telephones Cables Ltd | Electric remote control and indication system |
US2466325A (en) * | 1945-07-18 | 1949-04-05 | Kearney & Trecker Corp | Saw guard for adjustable-saw saw tables |
US2496613A (en) * | 1944-05-30 | 1950-02-07 | William H Woodward | Guard for rotary disks |
US2509813A (en) * | 1947-09-29 | 1950-05-30 | Stratos Corp | Emergency disconnect means for auxiliaries |
US2517649A (en) * | 1949-04-09 | 1950-08-08 | Frechtmann Jean | Blade guard |
US2518684A (en) * | 1949-04-21 | 1950-08-15 | Hyman M Harris | Duplex bench saw |
US2530290A (en) * | 1946-12-12 | 1950-11-14 | Atlas Press Company | Table saw with tiltable and vertically adjustable arbor |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2675707A (en) * | 1954-04-20 | brown | ||
US2554124A (en) * | 1946-03-05 | 1951-05-22 | Zita Wallace Salmont | Means for automatic control of machinery or other devices |
US2590035A (en) * | 1947-09-10 | 1952-03-18 | Pollak Abraham | Tilting-arbor saw and cradle suspension therefor |
US2572326A (en) * | 1948-07-12 | 1951-10-23 | Evans Mervyn Camille | Circular saw guard |
US2623555A (en) * | 1948-07-14 | 1952-12-30 | Rockwell Mfg Co | Saw guard |
US2695638A (en) * | 1949-02-17 | 1954-11-30 | King Seeley Corp | Tilting arbor circular wood saw |
US2593596A (en) * | 1949-03-24 | 1952-04-22 | George V Olson | Circular saw guard |
US2690084A (en) * | 1950-08-01 | 1954-09-28 | Atlas Press Company | Spring belt tension equalizer for machine tools |
US2626639A (en) * | 1950-11-04 | 1953-01-27 | Duro Metal Products Co | Belt and pulley drive means for tiltable saws and the like |
US2625966A (en) * | 1951-06-01 | 1953-01-20 | Callender Foundry & Mfg Compan | Motor and belt drive for tilt arbor saws |
US2711762A (en) * | 1951-12-08 | 1955-06-28 | King Seeley Corp | Arbor saw |
US2661777A (en) * | 1952-09-15 | 1953-12-08 | Edgar J Hitchcock | Self-adjusting motor mounting for vertically adjusted saws |
US2678071A (en) * | 1953-02-06 | 1954-05-11 | Duro Metal Products Co | Motor mounting and drive means for power tools |
US2704560A (en) * | 1953-02-12 | 1955-03-22 | Gibraltar Mfg Co Inc | Tilt arbor bench saw |
US2722246A (en) * | 1953-05-22 | 1955-11-01 | Arnoldy Leo | Safety guards for power saws |
US2758615A (en) * | 1954-03-11 | 1956-08-14 | Hampden Brass And Aluminum Com | Mounting for tilting arbor rotary miter saws |
US2736348A (en) * | 1954-04-23 | 1956-02-28 | Kropp Forge Company | Band saw blade trap |
US2731049A (en) * | 1954-06-10 | 1956-01-17 | Orville C Akin | Saw guard assembly for rotary table saws |
US2786496A (en) * | 1955-12-06 | 1957-03-26 | Yates American Machine Co | Safety guard for circular saw |
US3597809A (en) * | 1969-08-11 | 1971-08-10 | Rixson Inc | Separating link |
US3827039A (en) * | 1973-01-31 | 1974-07-30 | J Agnese | Portable alarm system |
US4030061A (en) * | 1976-04-14 | 1977-06-14 | Minnesota Mining And Manufacturing Company | Electrical wire cutting circuit breaker |
US4281309A (en) * | 1978-03-28 | 1981-07-28 | Olson Harry W | Thermally actuated cut-off link or switch and method of making the same |
US4366465A (en) * | 1981-10-02 | 1982-12-28 | Ford Motor Company | False failure detection prevention in an air bag diagnostic system |
US5081406A (en) * | 1990-06-26 | 1992-01-14 | Saf-T-Margin, Inc. | Proximity responsive capacitance sensitive method, system, and associated electrical circuitry for use in controlling mechanical and electro-mechanical equipment |
ATE225486T1 (en) * | 1995-09-25 | 2002-10-15 | Jorn Sorensen | METHOD AND DEVICE FOR DETECTING THE DISTANCE BETWEEN A FIRST OBJECT AND A SECOND OBJECT |
-
2002
- 2002-08-09 US US10/215,929 patent/US20030037651A1/en not_active Abandoned
-
2004
- 2004-02-23 US US10/785,361 patent/US6997090B2/en not_active Expired - Lifetime
-
2006
- 2006-02-13 US US11/353,423 patent/US20060123960A1/en not_active Abandoned
Patent Citations (99)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US307112A (en) * | 1884-10-28 | Saw-guard | ||
US162814A (en) * | 1875-05-04 | Improvement in saw-guards | ||
US261090A (en) * | 1882-07-11 | Circular-saw guard | ||
US264412A (en) * | 1882-09-12 | Half to john h | ||
US299480A (en) * | 1884-05-27 | Saw-guard | ||
US302041A (en) * | 1884-07-15 | Saw-guard | ||
US146886A (en) * | 1874-01-27 | Improvement in sawing-machines | ||
US509253A (en) * | 1893-11-21 | Safety-guard for rip-saws | ||
US545504A (en) * | 1895-09-03 | Saw-guard | ||
US1311508A (en) * | 1919-07-29 | Planooraph co | ||
US1324136A (en) * | 1919-12-09 | Tool-operating machine | ||
US1896924A (en) * | 1933-02-07 | Table fob saws ob the like | ||
US869513A (en) * | 1907-06-17 | 1907-10-29 | Frederick C Pfeil | Saw-guard. |
US941726A (en) * | 1907-10-15 | 1909-11-30 | Charles F Pfalzgraf | Safety trip device for power-operated machines. |
US997720A (en) * | 1909-08-07 | 1911-07-11 | Othon Troupenat | Safety device for saws. |
US1050649A (en) * | 1910-05-28 | 1913-01-14 | Crescent Machine Company | Saw-guard. |
US1037843A (en) * | 1911-10-30 | 1912-09-10 | David S Ackley | Saw-guard |
US1054558A (en) * | 1912-07-29 | 1913-02-25 | Nye Company | Self-adjusting support for circular-saw and shaper guards. |
US1082870A (en) * | 1912-11-20 | 1913-12-30 | John W Humason | Saw-guard. |
US1148169A (en) * | 1913-01-06 | 1915-07-27 | Andrew F Howe | Saw-guard. |
US1126970A (en) * | 1913-02-10 | 1915-02-02 | Eastman Kodak Co | Saw-guard. |
US1074198A (en) * | 1913-03-21 | 1913-09-30 | Francis Vosburgh Phillips | Saw-guard. |
US1101515A (en) * | 1913-06-27 | 1914-06-30 | George H Adam | Safety saw-guard. |
US1205246A (en) * | 1913-10-27 | 1916-11-21 | Int Harvester Canada | Shipping-package. |
US1132129A (en) * | 1914-06-15 | 1915-03-16 | Fred M Stevens | Safety-grip for circular saws. |
US1154209A (en) * | 1914-08-11 | 1915-09-21 | John L Rushton | Saw-guard. |
US1255886A (en) * | 1915-11-23 | 1918-02-12 | Emerald E Jones | Saw-guard. |
US1258961A (en) * | 1916-03-09 | 1918-03-12 | James G Tattersall | Saw-guard and splitter. |
US1240430A (en) * | 1916-07-22 | 1917-09-18 | Peter Erickson | Cutter-guard. |
US1228047A (en) * | 1916-12-18 | 1917-05-29 | Darwin O Reinhold | Self-adjusting spreader for saws. |
US1244187A (en) * | 1917-02-17 | 1917-10-23 | Warren M Frisbie | Circular-saw guard. |
US1397606A (en) * | 1918-07-29 | 1921-11-22 | Christian N Smith | Safety-shield for circular saws |
US1450906A (en) * | 1919-07-28 | 1923-04-10 | Charles W Anderson | Power control for saw tables and the like |
US1381612A (en) * | 1919-10-24 | 1921-06-14 | George A Anderson | Saw-guard |
US1427005A (en) * | 1919-12-26 | 1922-08-22 | James D Mcmichael | Saw guard |
US1465224A (en) * | 1921-07-22 | 1923-08-14 | Lantz Joseph Edward | Automatic shield for circular saws |
US1430983A (en) * | 1921-10-05 | 1922-10-03 | Granberg Wilhelm | Guard for sawing machines |
US1464924A (en) * | 1922-06-20 | 1923-08-14 | William D Drummond | Saw guard |
US1496212A (en) * | 1923-02-06 | 1924-06-03 | James F Sullivan | Circular-saw guard |
US1526128A (en) * | 1923-10-20 | 1925-02-10 | Flohr Andrew | Saw guard |
US1527587A (en) * | 1923-12-07 | 1925-02-24 | Hutchinson Frank | Saw guard |
US1511797A (en) * | 1924-02-15 | 1924-10-14 | Frank E Berghold | Saw guard |
US1640517A (en) * | 1924-04-17 | 1927-08-30 | Paine Lumber Company Ltd | Saw guard |
US1553996A (en) * | 1924-04-19 | 1925-09-15 | Federer Joseph | Safety saw guard |
US1590988A (en) * | 1924-09-24 | 1926-06-29 | Wheland Company | Combined setwork and recede for sawmill carriages |
US1551900A (en) * | 1924-12-05 | 1925-09-01 | Robert L Morrow | Safety device |
US1582483A (en) * | 1925-01-13 | 1926-04-27 | Geniah B Runyan | Meat cutter |
US1701948A (en) * | 1925-04-02 | 1929-02-12 | Crowe Mfg Corp | Portable saw |
US1616478A (en) * | 1926-01-19 | 1927-02-08 | Julius C Reiche | Guard for circular saws |
US1600604A (en) * | 1926-03-06 | 1926-09-21 | Sorlien Andrew | Board holder for sawing machines |
US1662372A (en) * | 1926-04-26 | 1928-03-13 | Abraham D Ward | Saw guard |
US1712828A (en) * | 1927-02-14 | 1929-05-14 | Henry J Klehm | Saw guard |
US1711490A (en) * | 1927-09-12 | 1929-05-07 | William D Drummond | Saw guard |
US1774521A (en) * | 1928-10-31 | 1930-09-02 | Wilbur S Neighbour | Saw guard |
US1811066A (en) * | 1929-02-23 | 1931-06-23 | Carl E Tannewitz | Sawing machine |
US1807120A (en) * | 1929-03-11 | 1931-05-26 | Hall & Brown Wood Working Mach | Saw |
US1879280A (en) * | 1930-08-30 | 1932-09-27 | George V James | Guard for circular saws |
US1904005A (en) * | 1932-02-03 | 1933-04-18 | Masset Edward | Saw guard |
US1988102A (en) * | 1932-04-02 | 1935-01-15 | William H Woodward | Circular saw machine |
US1902270A (en) * | 1932-06-02 | 1933-03-21 | Delta Mfg Co | Miter gauge |
US1910651A (en) * | 1932-12-05 | 1933-05-23 | Delta Mfg Co | Trunnion table mounting |
US1938548A (en) * | 1933-02-04 | 1933-12-05 | Delts Mfg Company | Machine table extension |
US1963688A (en) * | 1933-02-15 | 1934-06-19 | Delta Mfg Co | Hollow fence bar and process of making the same |
US1993219A (en) * | 1933-07-12 | 1935-03-05 | Herberts Machinery Company Ltd | Circular saw |
US1938549A (en) * | 1933-07-22 | 1933-12-05 | Delta Mfg Co | Machine table |
US2007887A (en) * | 1933-09-20 | 1935-07-09 | Delta Mfg Co | Saw guard |
US2010851A (en) * | 1934-07-02 | 1935-08-13 | William D Drummond | Automatic hood guard |
US2038810A (en) * | 1934-09-06 | 1936-04-28 | Delta Mfg Co | Circular-saw machine |
US2106288A (en) * | 1934-09-27 | 1938-01-25 | Herbert E Tautz | Circular saw apparatus |
US2020222A (en) * | 1935-04-08 | 1935-11-05 | Delta Mfg Co | Machine table insert |
US2075282A (en) * | 1935-05-27 | 1937-03-30 | Duro Metal Prod Co | Bench saw |
US2095330A (en) * | 1936-07-25 | 1937-10-12 | Duro Metal Prod Co | Bench saw |
US2131492A (en) * | 1936-11-28 | 1938-09-27 | Walker Turner Company Inc | Tilting arbor table saw |
US2168282A (en) * | 1936-12-18 | 1939-08-01 | Delta Mfg Co | Circular saw |
US2106321A (en) * | 1937-02-16 | 1938-01-25 | Guertin Gilles | Saw guard |
US2163320A (en) * | 1937-05-01 | 1939-06-20 | William P Morgan | Sawing appliance |
US2121069A (en) * | 1937-06-14 | 1938-06-21 | Atlas Press Company | Circular saw |
US2241556A (en) * | 1938-06-20 | 1941-05-13 | Hydraulic Dev Corp Inc | Photoelectrically controlled press |
US2265407A (en) * | 1939-01-25 | 1941-12-09 | Delta Mfg Co | Tilting arbor saw |
US2261696A (en) * | 1939-03-15 | 1941-11-04 | Walker Turner Co Inc | Tilting saw |
US2299262A (en) * | 1940-04-29 | 1942-10-20 | Uremovich Mark | Power-driven bench saw |
US2292872A (en) * | 1940-07-10 | 1942-08-11 | Elwyn A Eastman | Double hinge tilting arbor saw |
US2312118A (en) * | 1940-07-31 | 1943-02-23 | Ray H Neisewander | Adjustable woodworking machine |
US2286589A (en) * | 1940-10-28 | 1942-06-16 | Carl E Tannewitz | Blade grabber for band saws |
US2328244A (en) * | 1941-02-24 | 1943-08-31 | William H Woodward | Circular saw machine |
US2313686A (en) * | 1941-03-17 | 1943-03-09 | Uremovich Mark | Saw guard |
US2352235A (en) * | 1941-09-10 | 1944-06-27 | Delta Mfg Co | Saw guard |
US2377265A (en) * | 1942-01-09 | 1945-05-29 | Gen Motors Corp | Sealed-in regulator |
US2402232A (en) * | 1942-04-20 | 1946-06-18 | Automatic Elect Lab | Automatic telephone system |
US2452589A (en) * | 1943-01-22 | 1948-11-02 | Standard Telephones Cables Ltd | Electric remote control and indication system |
US2392486A (en) * | 1943-10-20 | 1946-01-08 | Melvin J Larsen | Machine tool |
US2496613A (en) * | 1944-05-30 | 1950-02-07 | William H Woodward | Guard for rotary disks |
US2434174A (en) * | 1944-06-19 | 1948-01-06 | Joseph P Morgan | Safety brake for band-saw blades |
US2466325A (en) * | 1945-07-18 | 1949-04-05 | Kearney & Trecker Corp | Saw guard for adjustable-saw saw tables |
US2425331A (en) * | 1945-12-13 | 1947-08-12 | Linzie F Kramer | Guard device for circular-saw table sawing machines |
US2530290A (en) * | 1946-12-12 | 1950-11-14 | Atlas Press Company | Table saw with tiltable and vertically adjustable arbor |
US2509813A (en) * | 1947-09-29 | 1950-05-30 | Stratos Corp | Emergency disconnect means for auxiliaries |
US2517649A (en) * | 1949-04-09 | 1950-08-08 | Frechtmann Jean | Blade guard |
US2518684A (en) * | 1949-04-21 | 1950-08-15 | Hyman M Harris | Duplex bench saw |
Cited By (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7788999B2 (en) | 1999-10-01 | 2010-09-07 | Sd3, Llc | Brake mechanism for power equipment |
US9925683B2 (en) | 1999-10-01 | 2018-03-27 | Sawstop Holding Llc | Table saws |
US9522476B2 (en) | 1999-10-01 | 2016-12-20 | Sd3, Llc | Power equipment with detection and reaction systems |
US8408106B2 (en) | 1999-10-01 | 2013-04-02 | Sd3, Llc | Method of operating power equipment with detection and reaction systems |
US8196499B2 (en) | 1999-10-01 | 2012-06-12 | Sd3, Llc | Power equipment with detection and reaction systems |
US9969014B2 (en) | 1999-10-01 | 2018-05-15 | Sawstop Holding Llc | Power equipment with detection and reaction systems |
US10335972B2 (en) | 1999-10-01 | 2019-07-02 | Sawstop Holding Llc | Table Saws |
US7895927B2 (en) | 1999-10-01 | 2011-03-01 | Sd3, Llc | Power equipment with detection and reaction systems |
US8191450B2 (en) | 2000-08-14 | 2012-06-05 | Sd3, Llc | Power equipment with detection and reaction systems |
US9038515B2 (en) | 2000-08-14 | 2015-05-26 | Sd3, Llc | Logic control for fast-acting safety system |
US20020020261A1 (en) * | 2000-08-14 | 2002-02-21 | Gass Stephen F. | Replaceable brake mechanism for power equipment |
US7832314B2 (en) | 2000-08-14 | 2010-11-16 | Sd3, Llc | Brake positioning system |
US8522655B2 (en) | 2000-08-14 | 2013-09-03 | Sd3, Llc | Logic control for fast-acting safety system |
US8151675B2 (en) | 2000-08-14 | 2012-04-10 | Sd3, Llc | Logic control for fast-acting safety system |
US7921754B2 (en) | 2000-08-14 | 2011-04-12 | Sd3, Llc | Logic control for fast-acting safety system |
US8061245B2 (en) | 2000-09-29 | 2011-11-22 | Sd3, Llc | Safety methods for use in power equipment |
US7712403B2 (en) | 2001-07-03 | 2010-05-11 | Sd3, Llc | Actuators for use in fast-acting safety systems |
US20050039822A1 (en) * | 2003-08-20 | 2005-02-24 | Gass Stephen F. | Woodworking machines with overmolded arbors |
US7836804B2 (en) | 2003-08-20 | 2010-11-23 | Sd3, Llc | Woodworking machines with overmolded arbors |
US7866239B2 (en) | 2003-12-31 | 2011-01-11 | Sd3, Llc | Elevation mechanism for table saws |
US7991503B2 (en) | 2003-12-31 | 2011-08-02 | Sd3, Llc | Detection systems for power equipment |
US20100023137A1 (en) * | 2003-12-31 | 2010-01-28 | Gass Stephen F | Detection systems for power equipment |
US7827893B2 (en) | 2003-12-31 | 2010-11-09 | Sd3, Llc | Elevation mechanism for table saws |
US10052786B2 (en) | 2004-01-29 | 2018-08-21 | Sawstop Holding Llc | Table saws with safety systems and systems to mount and index attachments |
US10882207B2 (en) | 2004-01-29 | 2021-01-05 | Sawstop Holding Llc | Table saws with safety systems and systems to mount and index attachments |
US7827890B2 (en) | 2004-01-29 | 2010-11-09 | Sd3, Llc | Table saws with safety systems and systems to mount and index attachments |
US8505424B2 (en) | 2004-01-29 | 2013-08-13 | Sd3, Llc | Table saws with safety systems and systems to mount and index attachments |
US8074546B1 (en) | 2005-03-11 | 2011-12-13 | Power Tool Institute | Pyrotechnic drop mechanism for power tools |
US20080245200A1 (en) * | 2005-07-18 | 2008-10-09 | Bladestop Pty Limited | Electric Saw with Operator Protection System |
US7628101B1 (en) | 2006-03-13 | 2009-12-08 | Power Tool Institute | Pyrotechnic drop mechanism for power tools |
US20100206145A1 (en) * | 2008-09-08 | 2010-08-19 | Power Tool Institute | Detection system for power tool |
US20100059144A1 (en) * | 2008-09-08 | 2010-03-11 | Power Tool Institute | Detection system for power tool |
US8186253B2 (en) | 2008-09-08 | 2012-05-29 | Power Tool Institute | Detection system for power tool |
US7739934B2 (en) | 2008-09-08 | 2010-06-22 | Power Tool Institute | Detection system for power tool |
US8919231B2 (en) | 2008-11-19 | 2014-12-30 | Power Tool Institute | Safety mechanisms for power tools |
US8122798B1 (en) | 2008-11-19 | 2012-02-28 | Power Tool Institute | Power cutting tool with proximity sensing system |
US10632642B2 (en) | 2008-11-19 | 2020-04-28 | Power Tool Institute | Table saw with table sensor for sensing characteristic of workpiece |
US20100269654A1 (en) * | 2009-04-28 | 2010-10-28 | Needel Gregory E | Dust Collection System for a Power Tool |
US8534174B2 (en) | 2010-09-27 | 2013-09-17 | Power Tool Institute | Pyrotechnic actuator and power cutting tool with safety reaction system having such pyrotechnic actuator |
US11085582B2 (en) | 2017-08-30 | 2021-08-10 | Milwaukee Electric Tool Corporation | Power tool having object detection |
US11674642B2 (en) | 2017-08-30 | 2023-06-13 | Milwaukee Electric Tool Corporation | Power tool having object detection |
Also Published As
Publication number | Publication date |
---|---|
US20040163514A1 (en) | 2004-08-26 |
US20030037651A1 (en) | 2003-02-27 |
US6997090B2 (en) | 2006-02-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6997090B2 (en) | Safety systems for power equipment | |
US7359174B2 (en) | Motion detecting system for use in a safety system for power equipment | |
US8371196B2 (en) | Motion detecting system for use in a safety system for power equipment | |
US8186255B2 (en) | Contact detection system for power equipment | |
US7137326B2 (en) | Translation stop for use in power equipment | |
US8061245B2 (en) | Safety methods for use in power equipment | |
US7509899B2 (en) | Retraction system for use in power equipment | |
US7908950B2 (en) | Table saw with improved safety system | |
US7098800B2 (en) | Retraction system and motor position for use with safety systems for power equipment | |
US6920814B2 (en) | Cutting tool safety system | |
US6826988B2 (en) | Miter saw with improved safety system | |
US20070028733A1 (en) | Safety methods for use in power equipment | |
US8430005B2 (en) | Miter saw with improved safety system | |
US20020056349A1 (en) | Miter saw with improved safety system | |
US20030140749A1 (en) | Brake Pawls for power equipment | |
US20050139051A1 (en) | Brake positioning system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SD3, LLC, OREGON Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GASS, STEPHEN F.;FANNING, DAVID A.;FULMER, J. DAVID;AND OTHERS;REEL/FRAME:017351/0001;SIGNING DATES FROM 20020809 TO 20021011 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |