WO1986004855A1 - A displaceable protective cover for handtools provided with rotatable disc-shaped tools - Google Patents

A displaceable protective cover for handtools provided with rotatable disc-shaped tools Download PDF

Info

Publication number
WO1986004855A1
WO1986004855A1 PCT/SE1986/000068 SE8600068W WO8604855A1 WO 1986004855 A1 WO1986004855 A1 WO 1986004855A1 SE 8600068 W SE8600068 W SE 8600068W WO 8604855 A1 WO8604855 A1 WO 8604855A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
halves
slide
protective cover
stationary part
Prior art date
Application number
PCT/SE1986/000068
Other languages
French (fr)
Inventor
Kaj Mickos
Original Assignee
Kaj Mickos
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kaj Mickos filed Critical Kaj Mickos
Priority to AT86901561T priority Critical patent/ATE48785T1/en
Priority to DE8686901561T priority patent/DE3667626D1/en
Publication of WO1986004855A1 publication Critical patent/WO1986004855A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/06—Safety devices for circular cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B29/00—Guards or sheaths or guides for hand cutting tools; Arrangements for guiding hand cutting tools
    • 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
    • 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
    • F16P1/00—Safety devices independent of the control and operation of any machine
    • F16P1/02—Fixed screens or hoods
    • 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
    • Y10T83/606—Interrelated tool actuating means and guard 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
    • Y10T83/7734—With guard for tool

Definitions

  • a dlsplaceable protective cover for handtools provided with rotatable disc-shaped tools.
  • the present invention relates to a displaceable protective cover, or guard, for handtools provided with rotatable, disc-shaped tools, such as disc cutters, grinding discs, circular sawblades etc..
  • Protective covers, or guards, of this kind are known to the art, and in particular in connection with circular saws, and comprise a stationary part and a displaceable part, this latter part, when in its rest position, together with the stationary part completely embracing the saw blade.
  • the protective cover prevents personal contact with the tool and also protects the operator from flying chips, shavings etc..
  • Hand-operated -cutting and grinding machines are used in a different manner to circular saws, and a protective cover of the aforesaid kind would present a serious obstacle in the operation of such machines. Consequently, there is used in conjunction with such machines a protective cover or guide of simpler construction which does not offer any protective function in the true sense of the word, despite the fact that these machines are the most dangerous to use. Because of its great mass, a cutting and grinding disc will continue to rotate at a high speed long after the drive motor has been switched off, and consequently a protective cover which fully encloses the disc would seem an obvious necessity.
  • the object of the invention is to provide a protective cover which will practically totally obviate the aforesaid risks with all of the aforementioned kinds of handtools, without rendering the tool difficult to use to any appre ⁇ ciable extent.
  • both cover-halves may be provided with a latching mechanism which locks the cover-halves against continued rotary movement when the speed of rotation becomes excessi- vely high, i.e. similar to the effect achieved with auto ⁇ matically coilable, vehicle safety belts.
  • the said facility can also be realised with a latching mechanism constructed to allow the two cover-halves to rotate synchronously from their rest position, and to lock the cover-halves against further rotation when one of said cover-halves has been rotated through an angle greater than the other.
  • the handtool must be handled in such a manner that both cover-halves are pressed apart by the workpiece with substantially the same pressure. Tests have shown that this can be very readily achieved.
  • This construction also imparts a highly valuable property to the handtool, insomuch as the handtool will work the work- piece positively with the tool directed towards avoiding the circumstances under which the tool is liable to throw; since the two cover-halves are connected together, they are always opened through mutually the same angle, so that when cutting pipe or tubing for example, the centre line of the pipe is guided towards the mid-way line between the edges of the two cover-halves, i.e. these edges can be used as a support when cutting the pipe, thereby preventing the cutting tool from throwing.
  • Figure 1 illustrates the protective cover from above, and partly in section, with a handtool located beneath the protective cover;
  • Figure 2 is a partial view which shows the engagement of the tool with a pipe to be cut; and Figure 3 is a partial view between the tool and a metal sheet to be sawn.
  • Fig. 1 illustrates a handtool 1 of a general, known kind for use when grinding and cutting or when sawing a work- piece.
  • the handtool includes a shaft 2, to which there is attached a disc-shaped tool 3.
  • the handtool also includes a collar 4 which is concentrical with the shaft 2 and on which an attachment sleeve 5 provided on a stationary part 6 of the protective-cover assembly is mounted in a conven ⁇ tional manner.
  • the protective-cover assembly comprises two halves 7,8 which are rotatably journalled on the attach ⁇ ment sleeve 5.
  • the cover-half 8 is somewhat smaller than the cover-half 7 and projects slightly thereinto; in order to show this clearly in the figure, the upper sides of the two cover-halves have been partially cut away, as has also a sector of the rotatable tool 3, which in this instance is assumed to be a cutting disc.
  • Each of the cover-halves 7,8 is provided on its respective underside with a through-passing track 11,12, these tracks intersecting one another.
  • a slide 14 which is radially movable in the stationary part 6 and from which a guide post 13 extends up through the two tracks 11,12 in the point of intersection thereof.
  • the slide is guided by two substantially radial edges 15,16, which are slightly serrated or toothed, as are also the slide edges of the slide.
  • the post 13 is biased radially inwards by a draw spring 17 extending between the post 13 and the attachment sleeve 5.
  • a brake shoe 22 is mounted on the stationary part 6.
  • the brake shoe can be applied to the peripheral surface of the cover-half 7 and is manouvered with the aid of a Bowden cable and a press button or the like not shown, provided on one of the handles of the handtool, should it be necessary to hold the two cover-halves temporarily in their open position.
  • the tracks 11 and 12 are so formed that when either of the cover-halves is subjected to a force acting in the opening direction, the post 13 will transmit to the slide 14 a force which urges the slide towards either of said radial edges 15,16, the direction of force on the post 13 being such that the sum of the spring force and the frictional force between the slide 14 and a respective side edge 15 or 16 is greater than the radially upwardly directed force component acting on the post 13, i.e. the slide 14 is locked.
  • the cover-halves 7,8 can be rotated through an opening angle determined by the length of the tracks 11,12, al ⁇ though if either of the guide-lips 20,21 has been subject to impact prior hereto, the slide 14 is pressed against the fixed edge 16 or 15 respectively, and the slide 14 is immediately locked until the pressures ' exerted on the post 13 by the two cover-halves 7,8 are equally great as one another, whereupon the two cover-halves can again be rota ⁇ ted in the opening direction during the continued out ⁇ ward movement of the slide 14.
  • Figure 2 illustrates the cutting of a pipe or tube 25.
  • the guide-lips 20,21 force the cover-halves apart and the bisectrix 26 is automatically placed through the centre line 27 of the pipe 25.
  • Fig. 3 illustrates the cutting of a sheet 35.
  • the guide- lips are placed against the sheet, wherewith the cover- halves 7,8 rotate in the opening direction.
  • the tool can be tilted slightly, so that only one guide-lip bears against the sheet.
  • the cover-halves can then be locked in this ope ⁇ ning position and a constant saw or cutting depth obtained.

Abstract

Displaceable protective cover for handtools using rotary, disc-shaped tools. The protective cover comprises two halves (7, 8) which completely enclose the tool (3) when in their rest position. The cover-halves (7, 8) can be rotated to an open position against the action of a spring force, and are connected to a latching mechanism (11, 12), arranged to lock the cover-halves against further rotation when either of the cover-halves (7, 8) is subjected to an impact force.

Description

A dlsplaceable protective cover for handtools provided with rotatable disc-shaped tools.
The present invention relates to a displaceable protective cover, or guard, for handtools provided with rotatable, disc-shaped tools, such as disc cutters, grinding discs, circular sawblades etc..
Protective covers, or guards, of this kind are known to the art, and in particular in connection with circular saws, and comprise a stationary part and a displaceable part, this latter part, when in its rest position, together with the stationary part completely embracing the saw blade. The protective cover prevents personal contact with the tool and also protects the operator from flying chips, shavings etc..
Hand-operated -cutting and grinding machines are used in a different manner to circular saws, and a protective cover of the aforesaid kind would present a serious obstacle in the operation of such machines. Consequently, there is used in conjunction with such machines a protective cover or guide of simpler construction which does not offer any protective function in the true sense of the word, despite the fact that these machines are the most dangerous to use. Because of its great mass, a cutting and grinding disc will continue to rotate at a high speed long after the drive motor has been switched off, and consequently a protective cover which fully encloses the disc would seem an obvious necessity. If it were possible to provide a protective cover_ of this kind which would not make the cutting and grinding work- involved difficult to carry out, it might then be possible to reduce the amount of red-hot chips, dust etc. which are flung from the machine to the surroun¬ dings in work of this nature, or even to eliminate such an occurrence. In order for the protective cover to live up to its name, it must be capable of preventing accidents should the tool throw to one side, i.e. move violently, as often occurs with both .circular saws and with grinding and cutting machines. When a tool throws it moves extremely violently, and when the protective cover provided includes a displaceable part, the cover is likely to be moved to a position in which the tool is fully exposed. It is also possible that the workman will completely lose his grip on the handtool in such eventualities.
The object of the invention is to provide a protective cover which will practically totally obviate the aforesaid risks with all of the aforementioned kinds of handtools, without rendering the tool difficult to use to any appre¬ ciable extent.
This object has been achieved with a protective cover or guard means according to the invention having the charac- teristic features set forth in the following claims. The invention is based on the concept that when in its rest position the protective cover will fully embrace the rotary tool. In addition, it shall also be possible in the majority of cases to open the protective cover, by bringing the handtool into normal engagement with a workpiece. More¬ over, it shall not be possible under any circumstance, for any of the displaceable cover-halves to be thrown up when subjected to impact, for example due to involuntary, vio¬ lent movement, or throw, of the handtool.
This latter facility can be achieved in several ways. For example, both cover-halves may be provided with a latching mechanism which locks the cover-halves against continued rotary movement when the speed of rotation becomes excessi- vely high, i.e. similar to the effect achieved with auto¬ matically coilable, vehicle safety belts.
The said facility can also be realised with a latching mechanism constructed to allow the two cover-halves to rotate synchronously from their rest position, and to lock the cover-halves against further rotation when one of said cover-halves has been rotated through an angle greater than the other. In this case, the handtool must be handled in such a manner that both cover-halves are pressed apart by the workpiece with substantially the same pressure. Tests have shown that this can be very readily achieved. This construction also imparts a highly valuable property to the handtool, insomuch as the handtool will work the work- piece positively with the tool directed towards avoiding the circumstances under which the tool is liable to throw; since the two cover-halves are connected together, they are always opened through mutually the same angle, so that when cutting pipe or tubing for example, the centre line of the pipe is guided towards the mid-way line between the edges of the two cover-halves, i.e. these edges can be used as a support when cutting the pipe, thereby preventing the cutting tool from throwing.
An exemplifying embodiment of a protective cover according to the invention will now be described in more detail with reference to the accompanying drawing, in which
Figure 1 illustrates the protective cover from above, and partly in section, with a handtool located beneath the protective cover;
Figure 2 is a partial view which shows the engagement of the tool with a pipe to be cut; and Figure 3 is a partial view between the tool and a metal sheet to be sawn.
Fig. 1 illustrates a handtool 1 of a general, known kind for use when grinding and cutting or when sawing a work- piece. The handtool includes a shaft 2, to which there is attached a disc-shaped tool 3. _The handtool also includes a collar 4 which is concentrical with the shaft 2 and on which an attachment sleeve 5 provided on a stationary part 6 of the protective-cover assembly is mounted in a conven¬ tional manner. The protective-cover assembly comprises two halves 7,8 which are rotatably journalled on the attach¬ ment sleeve 5. The cover-half 8 is somewhat smaller than the cover-half 7 and projects slightly thereinto; in order to show this clearly in the figure, the upper sides of the two cover-halves have been partially cut away, as has also a sector of the rotatable tool 3, which in this instance is assumed to be a cutting disc.
Each of the cover-halves 7,8 is provided on its respective underside with a through-passing track 11,12, these tracks intersecting one another. Arranged beneath the cover-half 7 is a slide 14 which is radially movable in the stationary part 6 and from which a guide post 13 extends up through the two tracks 11,12 in the point of intersection thereof. The slide is guided by two substantially radial edges 15,16, which are slightly serrated or toothed, as are also the slide edges of the slide. The post 13 is biased radially inwards by a draw spring 17 extending between the post 13 and the attachment sleeve 5.
Attached to the mutually opposing edges 18,19 of the cover- halves 7,8 are two obliquely and outwardly extending guide- lips 20,21. A brake shoe 22 is mounted on the stationary part 6. The brake shoe can be applied to the peripheral surface of the cover-half 7 and is manouvered with the aid of a Bowden cable and a press button or the like not shown, provided on one of the handles of the handtool, should it be necessary to hold the two cover-halves temporarily in their open position.
The tracks 11 and 12 are so formed that when either of the cover-halves is subjected to a force acting in the opening direction, the post 13 will transmit to the slide 14 a force which urges the slide towards either of said radial edges 15,16, the direction of force on the post 13 being such that the sum of the spring force and the frictional force between the slide 14 and a respective side edge 15 or 16 is greater than the radially upwardly directed force component acting on the post 13, i.e. the slide 14 is locked.
When, on the other hand, both of the cover-halves are subjected to an equal force in the opening direction, the force component on the post 13 is doubled, at the same time as the slide 14 is positioned centrally between the edges 15,16, so that the frictional force ceases, i.e. the slide 14 is displaced radially outwards whereas the two cover- halves 7,8 are rotated synchronously in a respective clockwise and anti-clockwise direction.
The cover-halves 7,8 can be rotated through an opening angle determined by the length of the tracks 11,12, al¬ though if either of the guide-lips 20,21 has been subject to impact prior hereto, the slide 14 is pressed against the fixed edge 16 or 15 respectively, and the slide 14 is immediately locked until the pressures' exerted on the post 13 by the two cover-halves 7,8 are equally great as one another, whereupon the two cover-halves can again be rota¬ ted in the opening direction during the continued out¬ ward movement of the slide 14.
When this state ceases, the slide 14 is drawn radially inwards by the spring 17 and the cover-halves 7,8 are rotated back to the illustrated starting position by the guide post 13.
Figure 2 illustrates the cutting of a pipe or tube 25. The guide-lips 20,21 force the cover-halves apart and the bisectrix 26 is automatically placed through the centre line 27 of the pipe 25.
Fig. 3 illustrates the cutting of a sheet 35. The guide- lips are placed against the sheet, wherewith the cover- halves 7,8 rotate in the opening direction. When the tool has penetrated the metal sheet, the tool can be tilted slightly, so that only one guide-lip bears against the sheet. The cover-halves can then be locked in this ope¬ ning position and a constant saw or cutting depth obtained.
It will be understood that the invention is not limited to the illustrated embodiment and that various modifica¬ tions can be made within the scope of the following claims. For example, instead of using the aforesaid vehicle safety- belt type latching mechanism, or the illustrated mechanism incorporating guide tracks 11,12, there can be used a link mechanism which connects the post 13 to the two cover- halves. In addition, the two halves 7,8 can be returned to their rest positions solely or partially with the aid of clock springs in the attachment sleeve 5. The "jamming" effect of the slide can also be achieved without serrating the edges 15,16 and the side edges of the slide 14.

Claims

1. A displaceable protective cover for handtools using rotatable, disc-shaped tools, such as cutting discs, grinding discs, circular saw blades etc., characterized in that the protective cover comprises two halves (7,8), which are rotatably journalled on a stationary part (5,6) provided on the handtool (1) and which, when occupying a rest position, embrace the rotatable tool (3) but can be rotated, against the action of a spring force, to a working position in which the one cover-half (8) projects into the other cover-half(7) , and are connected together by a latching mechanism (11-14) which co-acts with said stationary part and which is constructed to permit the two cover-halves to be rotated from the rest position but, in the event of an impact against either of the cover- halves (7,8), e.g. as a result of an involuntary throw of the handtool, to lock said one cover-half against further rotation.
2. A protective cover according to Claim 1, characterized in that the latching mechanism (11-14) is arranged to permit the two cover-halves to rotate synchronously from the rest position, but to lock the two cover-halves (7,8) against further rotation when one of said cover-halves is rotated momentarily through a larger angle than the other.
3. A protective cover according to Claim 2, characterized in that the latching mechanism comprises a slide (14) which is radially displaceable on the stationary part
(6) and which is connected on opposite sides with a res- pective cover-half (7,8), displacement of said slide being effective to rotate the two cover-halves through mutually the same angle in mutually opposite directions.
4. A protective cover according to Claim 3, characterized in that when the slide (14) is acted upon uniformly by the two cover-halves (7,8) the slide is caused to be displaced radially, whereas when the slide is acted upon to a greater extent by one of said cover-halves than the other of said cover-halves the slide (14) is arranged to lock securely against the stationary part (6) .
5. A protective cover according to Claim 4, characterized in that the abutment surfaces between the slide (14) and the stationary part are provided with friction-increasing means (15,16) .
6. A protective cover according to any one of Claims 3-5, characterized in that the slide (14) is provided with a guide post (13) which projects into a track (11,12) provi¬ ded in each of the halves of the protective cover, the slopes of the tracks in relation to the direction of radial movement of the slide (14) being so adapted that the slide (14) will be locked when acted upon substantial¬ ly by the one cover-half (7,8) .
7. A protective cover according to any one of Claims 3-6, characterized in that the slide (14) is arranged for • movement against the action of a spring force (17) acting thereupon, when the cover-halves (7,8) are rotated from said rest position.
PCT/SE1986/000068 1985-02-25 1986-02-18 A displaceable protective cover for handtools provided with rotatable disc-shaped tools WO1986004855A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT86901561T ATE48785T1 (en) 1985-02-25 1986-02-18 RESILIENT GUARD FOR DISC KNIFE TOOLS.
DE8686901561T DE3667626D1 (en) 1985-02-25 1986-02-18 SPRING-BACK PROTECTOR FOR DISC KNIFE TOOLS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8500931A SE443532B (en) 1985-02-25 1985-02-25 REMOVABLE PROTECTION FOR CRAFT CRAFTS, ROTABLE TOOLS
SE8500931-4 1985-02-25

Publications (1)

Publication Number Publication Date
WO1986004855A1 true WO1986004855A1 (en) 1986-08-28

Family

ID=20359274

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1986/000068 WO1986004855A1 (en) 1985-02-25 1986-02-18 A displaceable protective cover for handtools provided with rotatable disc-shaped tools

Country Status (7)

Country Link
US (1) US4711055A (en)
EP (1) EP0213172B1 (en)
JP (1) JPS62501897A (en)
AT (1) ATE48785T1 (en)
DE (1) DE3667626D1 (en)
SE (1) SE443532B (en)
WO (1) WO1986004855A1 (en)

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WO2008058901A1 (en) * 2006-11-13 2008-05-22 Robert Bosch Gmbh Protective hood securing device
EP2599601A1 (en) * 2011-11-29 2013-06-05 Hitachi Koki Co., Ltd. Cutting machine guard

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US4890389A (en) * 1989-03-08 1990-01-02 Whitkop George H Cutter guard
AT392435B (en) * 1989-05-10 1991-03-25 Vollbracht Ges M B H Dipl Ing ROTATING TOOL, IN PARTICULAR PENDULUM GRINDING MACHINE
US5651418A (en) * 1995-04-17 1997-07-29 Jerez; Orlando Convertible, user-supported, garden cleaning implement for cutting/macerating weeds and like
US5765289A (en) * 1996-12-20 1998-06-16 Fiskars Inc. Rotary cutter
GB2329440A (en) * 1997-09-23 1999-03-24 Liu Wun Hui Front shield of power sanding machine
DE10110119A1 (en) * 2001-03-02 2002-09-12 Bosch Gmbh Robert Hand tool
US6722047B2 (en) 2001-11-13 2004-04-20 S-B Power Tool Company Tool guard attachment for a rotary hand tool
US6699114B1 (en) 2002-04-26 2004-03-02 Benedict Engineering Company, Inc. Pivotal guards for power hand tools with rotating discs
DE102004004333A1 (en) * 2004-01-29 2005-08-18 Metabowerke Gmbh Electric hand tool
EP1772239B1 (en) * 2005-10-07 2013-10-09 Black & Decker, Inc. Saw
US9908193B2 (en) 2013-02-12 2018-03-06 JPL Global, LLC Dust guard for circular saws
JP6983101B2 (en) * 2018-04-10 2021-12-17 株式会社マキタ Power tools and covers
CN109484608B (en) * 2018-12-07 2022-07-29 徐州创航科技有限公司 Unmanned pesticide spraying machine main engine cabin cover locking structure
CN112140209A (en) * 2020-09-28 2020-12-29 衡东县祥云塑料有限责任公司 Cutting device for plastic processing
DE102022106403A1 (en) 2022-03-18 2023-09-21 Holz-Her Gmbh TOOL UNIT FOR A VERTICAL PANEL SAW

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US2589309A (en) * 1946-08-27 1952-03-18 Ralph R Roemer Circular saw safety guard
US4318324A (en) * 1980-09-22 1982-03-09 Rock Mill, Inc. Cutting machine with guard for cutting blade

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US1402959A (en) * 1921-11-04 1922-01-10 Arthur M Quinton Slicing-machine knife guard
US3913437A (en) * 1974-02-11 1975-10-21 Black & Decker Mfg Co Lower guard assembly for power saw
US4033218A (en) * 1976-06-04 1977-07-05 Spanjer Brothers, Inc. Table-saw guard

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US1464924A (en) * 1922-06-20 1923-08-14 William D Drummond Saw guard
US2589309A (en) * 1946-08-27 1952-03-18 Ralph R Roemer Circular saw safety guard
US4318324A (en) * 1980-09-22 1982-03-09 Rock Mill, Inc. Cutting machine with guard for cutting blade

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008058901A1 (en) * 2006-11-13 2008-05-22 Robert Bosch Gmbh Protective hood securing device
US8460070B2 (en) 2006-11-13 2013-06-11 Robert Bosch Gmbh Guard lock
EP2599601A1 (en) * 2011-11-29 2013-06-05 Hitachi Koki Co., Ltd. Cutting machine guard

Also Published As

Publication number Publication date
JPS62501897A (en) 1987-07-30
ATE48785T1 (en) 1990-01-15
EP0213172A1 (en) 1987-03-11
EP0213172B1 (en) 1989-12-20
SE443532B (en) 1986-03-03
DE3667626D1 (en) 1990-01-25
SE8500931D0 (en) 1985-02-25
US4711055A (en) 1987-12-08

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