US20130009448A1 - Wheel device for skate board or rolller skate - Google Patents
Wheel device for skate board or rolller skate Download PDFInfo
- Publication number
- US20130009448A1 US20130009448A1 US13/541,728 US201213541728A US2013009448A1 US 20130009448 A1 US20130009448 A1 US 20130009448A1 US 201213541728 A US201213541728 A US 201213541728A US 2013009448 A1 US2013009448 A1 US 2013009448A1
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- United States
- Prior art keywords
- aforementioned
- hub
- tread
- shoulder
- ribs
- 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
- 238000010079 rubber tapping Methods 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 239000004416 thermosoftening plastic Substances 0.000 description 4
- 238000005119 centrifugation Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011436 cob Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
- A63C17/00—Roller skates; Skate-boards
- A63C17/22—Wheels for roller skates
- A63C17/226—Wheel mounting, i.e. arrangement connecting wheel and axle mount
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
- A63C17/00—Roller skates; Skate-boards
- A63C17/01—Skateboards
- A63C17/014—Wheel arrangements
- A63C17/015—Wheel arrangements with wheels arranged in two pairs
Definitions
- the invention relates to a wheel device for skate board or roller skate.
- Wheel devices for skate board or roller skate comprising a wheel mounted on truck are known, the aforementioned wheel comprising a central hub having a single bore for the housing of rollers, the aforementioned rollers providing the connection of the aforementioned hub with the aforementioned truck.
- a removable tread is mounted on the exterior wall of the hub, connecting means enabling holding in position of the aforementioned tread on the aforementioned hub.
- This type of mounting is particularly advantageous because it enables easy changing of the tread when it is worn or when the user wishes to modify the characteristics (tread made of rigid, flexible material, including an air chamber, . . . ), without having to dismount the hub or the rollers.
- the main objective of the invention is to remedy this state of effort.
- an object of the invention is to limit the vibrations at medium or high speeds.
- Another object of the invention is to limit the temperature rise at the hub/tread connection.
- Yet another object of the invention is to eliminate the risk of loosening of the tread.
- the solution offered by the invention is a wheel device for skate board or roller skates, comprising a wheel mounted on a truck, the aforementioned wheel comprising:
- the device is remarkable in that the tread has a bore provided with a shoulder forming housing for the hub, the interior wall of the aforementioned shoulder radially positioning the exterior wall of the aforementioned hub, the aforementioned tread being locked in rotation and in axial position on the aforementioned hub by means of a locking screw traversing the aforementioned shoulder from side to side and attaching on the connecting means of the aforementioned hub.
- the screws By traversing the tread from side to side, the screws provide a complete rotational and axial locking of the aforementioned tread on the hub. All relative movement of the tread and of the hub being eliminated, the risks of heating are zero.
- the periphery of the tread is stretched by centrifugation, but does not alter in anyway its connection with the hub, the locking of the aforementioned tread being fully ensured.
- the device object of the invention thus enables a particularly fine and very safe practice of roller devices, whatever the rotational speeds.
- FIG. 1 is a schematic bottom view of a skateboard or skateboard
- FIG. 2 is an enlarged view of section A-A of FIG. 1 , this figure showing a device in accordance with the invention
- FIG. 3 is a radial sectional view of a hub in accordance with the invention.
- FIG. 4 a is a radial sectional view of a tread in accordance with the invention.
- FIG. 4 b is a radial sectional view of a tread in accordance with the invention, in an implementation variant,
- FIG. 5 is an enlarged view of section A-A of FIG. 1 , showing the device in accordance with the invention in an implementation variant,
- FIG. 6 is a radial sectional view of a hub in accordance with the invention, in an implementation variant.
- skateboards ie skateboards in English
- roller skates commonly called “quad”
- any other similar wheeled device ie skateboards in English
- a skateboard generally comprises a deck 10 on which are attached trucks 11 (referred to as “trucks” in English). These trucks 11 are positioned at the front and rear of the deck 10 . Wheels 12 are mounted cantilevered at each of the ends of the trucks 11 . Each truck 11 is thus equipped with a pair of wheels 12 .
- trucks 11 referred to as “trucks” in English.
- Wheels 12 are mounted cantilevered at each of the ends of the trucks 11 .
- Each truck 11 is thus equipped with a pair of wheels 12 .
- examples of cantilevered mounting of wheels are described in the document FR 930,820 (MERCHANT), to which the person of skill in the art can refer.
- the device object of the invention comprises a single central hub 20 having a generally substantially cylindrical shape.
- the hub 20 is made of a material such as steel, aluminum or rigid thermoplastic, optionally fiber-filled. It is obtained by machining, molding, stamping, or any other similar processes.
- the hub 20 has an internal bore 23 ( FIG. 3 ) for the housing of rollers 21 .
- This axial bore 23 traverses the hub 20 from side to side.
- each wheel 12 is provided with a pair of rollers having single row of balls with radial contact, double sealed, optional bushing joints, lubricated for life and maintenance free.
- a mounting with a single roller having double row of balls or having rollers can however be considered.
- the internal diameter of the bore 23 is dimensioned to tightly receive the exterior rings of rollers 21 .
- a circular shoulder 22 positioned in the middle of the bore 23 , enables axial stopping of the exterior rings of the rollers 21 and centering of the latter.
- the interior rings of rollers 21 are mounted sliding true on the truck 11 , the aforementioned rollers thus assuring a pivot connection between the hub 20 and the aforementioned truck.
- the exterior wall 220 of the hub 20 is concentric with the internal bore 23 and comprises attachment brackets 24 , which extend away from the aforementioned wall.
- the number of attachment brackets 24 is equal to three, but a greater or lesser number (preferably at least two) can be considered.
- These brackets 24 are of identical shapes and are arranged in star, equidistant from each other to ensure a good balance (three legs arranged at 120° in FIG. 3 ).
- the brackets 24 are off center on the exterior wall of the hub 20 , being closer to one of the edges of the aforementioned hub. In practice, the exterior wall of the hub does not have any obstacles between the brackets 24 and the other edge.
- the attachment brackets 24 each comprise a front face 240 designed to be positioned against a shoulder 32 of the tread 3 and a rear face 241 opposite to the aforementioned front face.
- the two front and rear faces 240 and 241 are parallel to each other and perpendicular to the common axis A of the hub 20 , of the internal bore 23 and of the tread 3 .
- the brackets 24 are integral with the hub 20 by being shaped during the manufacturing process of the latter. It is however envisionable to bring the brackets 24 on the exterior wall of the hub 20 , fixing them for example by welding or by a mechanical linkage.
- the brackets 24 are separated from each other ( FIG. 3 ) so that air can possibly move between them.
- the attachment brackets 24 are connected to each other, the connection between the aforementioned brackets can have axial orifices for the circulation of air.
- the mounting attachment brackets 24 each comprise at least an axial bore 25 for the passage of locking screw 4 .
- each bore 25 opens on the two faces 240 and 241 of the attachment brackets 24 .
- These bores 25 are arranged on a common concentric diameter with the internal bore 23 , are positioned at equal distance from each other and are parallel to the common axis A.
- the rear face 241 of the brackets 24 is provided with ribs 26 positioned on either side of the axial bores 25 , equidistant from the latter.
- each bore 25 opens advantageously in the middle of a groove (delimited by the two ribs 26 ) made on the rear face 241 .
- the ribs 26 are configured to axially stiffen the attachment brackets 24 .
- the tread 3 (or tire) is removably mounted on the exterior wall of the hub 20 .
- the tread 3 has a substantially cylindrical general shape.
- the tread 3 is made entirely of rigid polyurethane obtained by molding.
- the aforementioned tread is advantageously made of bi-material: soft polyurethane on the periphery cast molded or bonded onto a rigid thermoplastic or aluminum type core.
- the thread 3 can also be made of rubber with an interior air chamber tube mounted on an aluminum or thermoplastic rim.
- the tread 3 can have an internal bore 33 ( FIGS. 4 a , 4 b ) axially traversing the aforementioned tread from side to side and whose diameter is larger than the exterior diameter of the attachment brackets 24 of the hub 20 .
- a circular shoulder 32 positioned substantially in the middle of the bore 33 , enables reception of the hub 20 .
- the shoulder 32 can be off centered, however.
- the interior diameter of the shoulder 32 is concentric with the exterior periphery of the tread 3 and substantially corresponds to the exterior diameter of the hub 20 , so that the hub 20 is centered and therefore radially maintained in the shoulder 32 .
- the interior wall 320 of the shoulder 32 radially positions the exterior wall 220 of the hub 20 . Referring to FIG.
- the interior wall 320 of the shoulder 32 is cylindrical.
- the interior wall 320 can be partially cylindrical, thus forming a reduced span for centering on the hub 20 .
- the shoulder 32 comprises a first support face 330 and a second support face 331 , both of the aforementioned faces being parallel to each other and perpendicular to the common axis A.
- the tread 3 is put in place on the hub 20 so that the first support face 330 acts to abut against the front face 240 of the attachment brackets 24 .
- the tread 3 is thus axially positioned and centered on the aforementioned hub. As described in the following paragraph, it is essentially the locking screw 4 that provides the maintenance in axial position and prevents the rotation of tread 3 on the hub 20 .
- multiple axial orifices 36 traverse the shoulder 32 , from the first support face 330 to the second support face 331 .
- These orifices 36 are distributed between the attachment points of the tread 3 to allow air circulation. They correspond to the empty spaces left between the fixing attachment brackets 24 and enable, by circulation of air, limitation of heatings due to high rotation speeds of the wheel.
- the orifices 36 extend and open into the interior diameter of the shoulder 32 . In any event, for treads 3 that are not subjected to high speeds, the orifices 36 are not mandatory.
- the tread 3 comprises axial bores 35 for the passage of screws 4 .
- These bores 35 are arranged on a common diameter concentric with the interior diameter of the shoulder 32 , are positioned at equal distance from each other and are parallel to the common axis A. They traverse the shoulder 32 from side to side, (that is to say, they open up on support faces 330 and 331 ) and are arranged to be positioned vis-a-vis the bores 25 of the attachment brackets 24 when the tread 3 is mounted on the hub 20 .
- the locking screws 4 can be inserted into the bores 35 , 25 so as to traverse the shoulder 32 from side to side and re-emerge at the attachment brackets 24 in order to lock the tread 3 in axially position and in rotation on the hub 20 .
- Such a mounting enables compensation for all the dimensional plays between tread 3 and the hub 20 .
- the central part of the tread 3 comprising the shoulder 32 is designed so as not to creep while withstanding the stress of the pressure of the locking screws 4 and the stress of the effects of centrifugation due to the high operational rotation speeds.
- the width, thickness and material used to make the shoulder 32 will be selected by person of skill in the art so that the aforementioned shoulder is sufficiently rigid in order to not be subjected to creep under the compressive stress of screw 4 and under stress from medium or high centrifugal rotation speeds.
- the locking screws 4 are positioned at equal distance from each other, thus avoiding any imbalance on the wheel.
- the latter can include ribs (not shown) arranged between one of the support faces 330 and/or 331 of the shoulder 32 and the interior wall 320 of the aforementioned shoulder the internal bore 33 .
- These ribs will be located at equal distance from each other and positioned between the axial bores 35 of the tread 3 , so as to obstruct neither the positioning of the screw heads 40 , nor the installment of the aforementioned tread against the attachment brackets 24 of hub 20 .
- the screw heads 40 come into abutment against the first second support face 330 331 of the shoulder 32 .
- the other end of screws 4 re-emerge between the ribs 26 made on the rear face 241 of the attachment brackets 24 and are screwed into into a locking nut 41 .
- the ribs 26 are spaced so that the nut 41 can be lodged between the aforementioned ribs.
- locking nuts are used. It is not necessary to use a wrench to hold the nuts 41 during screwing, because the ribs 26 are configured to block the rotation of the aforementioned nuts.
- bores 25 , 35 are smooth.
- the screws 4 are screwed directly into the attachment brackets 24 , without it being necessary to use locking nuts.
- the axial bore 25 of the attachment brackets 24 is threaded.
- the ribs 26 are closer together than in the previous implementation mode so that the tapping extends on the interior flanks the aforementioned ribs.
- a permanent deformation is subsequently formed out on the exterior of the ribs 6 (with a press for example) so that they can approach each other.
- the tappings 25 of the brackets 24 are then no longer coaxial with tappings of the ribs 26 .
- the screws by introducing, act to pin up the ribs of 26 at their initial position. In this way, the ribs 26 can exert a clamping (thus braking) force on the screws 4 , preventing the latter from unscrewing.
- the hub 20 is preferentially made of steel.
- the protection washers 5 are positioned on the truck 11 , and are lodged in the interior of the bore 23 of the hub 20 , on both sides of the rollers 21 .
- These washers 5 comprise a circular lip 51 whose exterior diameter substantially corresponds (with a sufficient functional play) to the interior diameter of the bore 23 .
- the axial end of the lip 51 is close (with a sufficient functional play) to the face of the exterior ring of the aforementioned rollers, the latter thus being completely protected.
- the washers 5 can be made from steel, aluminum, or rigid thermoplastic. They can also be bi-material, their central part being made of steel and their circular lip made of molded elastomer. Thus, the axial end of the lips 51 can act to lightly run against the exterior rings of the rollers 21 .
- the mounting of the wheel 12 in the truck 11 is carried out in the following manner: the rollers 21 are positioned on the bore 23 of the aforementioned hub.
- a first washer 5 is inserted on the truck 11 so as to come to abut against a shoulder 110 of the aforementioned truck.
- the hub-roller mounting is inserted on the truck 11 so as to act to abut against the previously installed washer 5 .
- the mounting is on the truck 11 so that the side of the hub 20 bearing the attachment brackets 24 is first inserted for the aforementioned truck. In this way, the attachment brackets 24 are not an obstacle to the subsequent demounting of the tread 3 .
- the second washer 5 is inserted on the truck 11 so as to act to abut against the interior ring of the rollers 21 .
- a locking nut is screwed on the threaded end of the truck 11 so as to act to axially arrest the mounting assembly.
- the nut 112 has an outside diameter less than the interior diameter of the shoulder 32 of the tread 3 so as not to obstruct the dismounting of the latter.
- the tread 3 is then attached on the hub 20 .
- To change the thread 3 it is not necessary to dismount the mounting assembly. It suffices to remove the locking screw 4 and axially pull on the aforementioned tread so as to slide out of the hub 20 .
- the locking nut 112 is thus no longer stressed during the changing of the tread 3 . Its locking power will thus retain all of its operational effectiveness.
- the device of the invention provides a hub having integrated rollers whose configuration enables full use of the capacity of the aforementioned rollers and avoidance of occurrence of heating problems. It also enables avoidance of entry of dust into the hub having integrated rollers.
- the user can mount, on a single roller having single integrated bearings, multiple types of tires having different characteristics: tire made of rigid material, tire made of flexible material, tire including an air chamber, etc.
- a simple and effective connection is provided between the hub having rollers and the tread, this connection integrating a compensation for all the dimensional plays between the aforementioned hub and the aforementioned thread. Any risk of loosening of the tread in operation is eliminated.
- the rising temperature of the tread rubbing on the ground is limited by promoting the flow of air in the mounting.
Abstract
Disclosed is a wheel device for a skate board or a roller skate. A wheel includes a single central hub having an exterior wall and a bore for the housing of rollers, the rollers providing the connection with the hub of a truck; and a tread removably mounted on the exterior wall of the hub. A shoulder of the tread includes a first support face and a second support face, the two faces being parallel to each other and perpendicular to the common axis. The tread is locked in rotation and in axial position on the hub by means of locking screws, including heads abut against the second support face of the shoulder, the screws traversing the shoulder from side to side and attaching on the connecting means of the hub.
Description
- The invention relates to a wheel device for skate board or roller skate.
- It relates to the technical field of systems of holding a tread (or tire) in position on a wheel hub.
- Wheel devices for skate board or roller skate comprising a wheel mounted on truck are known, the aforementioned wheel comprising a central hub having a single bore for the housing of rollers, the aforementioned rollers providing the connection of the aforementioned hub with the aforementioned truck. A removable tread is mounted on the exterior wall of the hub, connecting means enabling holding in position of the aforementioned tread on the aforementioned hub.
- This type of mounting is particularly advantageous because it enables easy changing of the tread when it is worn or when the user wishes to modify the characteristics (tread made of rigid, flexible material, including an air chamber, . . . ), without having to dismount the hub or the rollers.
- Such devices are described for example in the following patent documents:
-
- FR 2,369,855 (MATTEL) wherein the hub comprises a series of radial ribs designed to be lodged in complementary grooves provided in the tread for a radial locking. The maintenance axial position of the tread on the hub is achieved by means of a cap configured to be screwed into the aforementioned hub by bearing on the aforementioned tire;
- FR 930,820 (MARCHAND) wherein a tread is mounted on the hub. The holding in position of the tread on the hub is carried out by elastic blades terminated by hooks;
- CH 595,860 (PERUHAG) wherein the hub comprises an annular bulge designed to be housed in an annular groove formed on the tread. This connection provides a axial and radial locking of the tire relative to the hub;
- U.S. Pat. No. 2,635,923 (ISHAM) wherein the hub has an external thread designed to be screwed into an internal thread provided on the tread. The holding in position of the tire on the hub is carried out by means of a cap configured to be screwed into the hub by bearing on the aforementioned tire;
- U.S. Pat. No. 2,627,440 (KLEIN) wherein a tread is mounted around the hub. The connection between the hub and the tread is acheived by means of a shell inserted in the interior the aforementioned tread and wherein the aforementioned hub is screwed. The radial locking of the tread on the shell is provided by a screwed cap;
- U.S. Pat. No. 2,304,944 (MARTINEC) wherein a nut is screwed into the hub. The nut and the hub are provided with lips penetrating into complementary grooves formed in the tread. These lips, combined with the tightening of the nut, enable radial and axial locking of the tire;
- GB 06752 (HERBERT) wherein the tread is locked in rotation on the hub by means of a projecting rib that engages in a complementary groove provided in the shoulder of the aforementioned tread. The axial locking is provided by a cover.
- FR 2,875,143 (LENOIR), U.S. Pat. No. 2,038,453 (SMITH), U.S. Pat. No. 1,100,242 (COBB) or U.S. Pat. No. 2,136,531 (VOGT) wherein a pair of flanges act to radially and axially lock the tread on the hub.
- All these solutions known from the prior art have a number of disadvantages. Indeed, at medium speeds (for example greater than or equal to 3500 rev/min for a wheel diameter of 70 mm) or high (for example greater than or equal to 7500 rev/min for a wheel diameter of 70 mm), these connections generate vibrations that make the practice of skate boarding or roller skates cumbersome, even difficult. Furthermore, it was found that the hub/tread connection caused overheating detrimental to holding in position of the aforementioned tread. Risks of loosening of the tread were also found. This is due to the fact that, at medium or high rotation speeds, the tread is stretched by centrifugation and alters the connection with the hub (or the locking flanges). This loosening phenomenon is amplified by using a soft tread.
- The main objective of the invention is to remedy this state of affaires. In particular, an object of the invention is to limit the vibrations at medium or high speeds. Another object of the invention is to limit the temperature rise at the hub/tread connection. Yet another object of the invention is to eliminate the risk of loosening of the tread.
- The solution offered by the invention is a wheel device for skate board or roller skates, comprising a wheel mounted on a truck, the aforementioned wheel comprising:
-
- a single central hub single having a bore for the housing of rollers, the aforementioned rollers providing the connection with the aforementioned hub of the aforementioned truck,
- a tread removably mounted on the exterior periphery of the hub.
- The device is remarkable in that the tread has a bore provided with a shoulder forming housing for the hub, the interior wall of the aforementioned shoulder radially positioning the exterior wall of the aforementioned hub, the aforementioned tread being locked in rotation and in axial position on the aforementioned hub by means of a locking screw traversing the aforementioned shoulder from side to side and attaching on the connecting means of the aforementioned hub.
- By traversing the tread from side to side, the screws provide a complete rotational and axial locking of the aforementioned tread on the hub. All relative movement of the tread and of the hub being eliminated, the risks of heating are zero. In addition, at medium or high rotation speeds, the periphery of the tread is stretched by centrifugation, but does not alter in anyway its connection with the hub, the locking of the aforementioned tread being fully ensured. The device object of the invention thus enables a particularly fine and very safe practice of roller devices, whatever the rotational speeds.
- Other features of the invention are listed below, each of these features can be considered alone or in combination with the remarkable features defined above:
-
- the hub comprises radial attachment brackets each comprising at least an axial bore for the passage of locking screws; axial bores for the passage of locking screws traverse the shoulder of the tread from side to side, the aforementioned bores being arranged so as to be positioned opposing bores of the attachment brackets when the aforementioned tread is mounted on the hub; the locking screws traverse the bores of the attachment brackets and of the shoulder.
- the blocking screws are positioned at equal distance from each other.
- the attachment brackets are connected to each other, the connection between the aforementioned brackets comprising axial orifices for air circulation.
- the tread comprises axial orifices for air circulation.
- the attachment brackets comprise a front face positioned against the tread and a rear face opposed to the aforementioned front face, the aforementioned rear face being provided with ribs positioned on both sides of the axial bore.
- the ribs are spaced so that a clamping nut of the locking screw can be housed between the aforementioned ribs.
- the axial bore of the attachment brackets is tapped, the aforementioned tapping extending on the interior flanks of the ribs.
- the tapping formed on the interior flanks of the ribs is not coaxial with the tapping in the attachment brackets, so that the aforementioned ribs exert a clamping force on the locking screws.
- the tread comprises ribs stiffening the periphery of the aforementioned tread, the aforementioned ribs being arranged between one of the support faces of the shoulder and the internal bore of the aforementioned tread, the aforementioned ribs being located at equal distance from each other and positioned between the axial bores of the aforementioned tread.
- protective washers are positioned on the truck, the aforementioned washers being housed in the interior of the bore of the hub, on both sides of the rollers, the aforementioned washers comprising a circular lip whose exterior diameter substantially corresponds to the interior diameter of the aforementioned bore.
- Other advantages and features of the invention will become apparent by reading the description of a preferred embodiment which follows, with reference to the accompanying drawings, made as examples and are not limiting and in which:
-
FIG. 1 is a schematic bottom view of a skateboard or skateboard, -
FIG. 2 is an enlarged view of section A-A ofFIG. 1 , this figure showing a device in accordance with the invention, -
FIG. 3 is a radial sectional view of a hub in accordance with the invention, -
FIG. 4 a is a radial sectional view of a tread in accordance with the invention, -
FIG. 4 b is a radial sectional view of a tread in accordance with the invention, in an implementation variant, -
FIG. 5 is an enlarged view of section A-A ofFIG. 1 , showing the device in accordance with the invention in an implementation variant, -
FIG. 6 is a radial sectional view of a hub in accordance with the invention, in an implementation variant. - The invention applies particularly to skateboards (ie skateboards in English), to roller skates, commonly called “quad,” or to any other similar wheeled device.
- Referring to
FIG. 1 , a skateboard generally comprises adeck 10 on which are attached trucks 11 (referred to as “trucks” in English). Thesetrucks 11 are positioned at the front and rear of thedeck 10.Wheels 12 are mounted cantilevered at each of the ends of thetrucks 11. Eachtruck 11 is thus equipped with a pair ofwheels 12. For roller skates, examples of cantilevered mounting of wheels are described in the document FR 930,820 (MERCHANT), to which the person of skill in the art can refer. - In
FIG. 2 , the device object of the invention comprises a singlecentral hub 20 having a generally substantially cylindrical shape. Thehub 20 is made of a material such as steel, aluminum or rigid thermoplastic, optionally fiber-filled. It is obtained by machining, molding, stamping, or any other similar processes. - The
hub 20 has an internal bore 23 (FIG. 3 ) for the housing ofrollers 21. This axial bore 23 traverses thehub 20 from side to side. In practice, eachwheel 12 is provided with a pair of rollers having single row of balls with radial contact, double sealed, optional bushing joints, lubricated for life and maintenance free. A mounting with a single roller having double row of balls or having rollers can however be considered. The internal diameter of thebore 23 is dimensioned to tightly receive the exterior rings ofrollers 21. Acircular shoulder 22, positioned in the middle of thebore 23, enables axial stopping of the exterior rings of therollers 21 and centering of the latter. The interior rings ofrollers 21 are mounted sliding true on thetruck 11, the aforementioned rollers thus assuring a pivot connection between thehub 20 and the aforementioned truck. - The
exterior wall 220 of thehub 20 is concentric with theinternal bore 23 and comprisesattachment brackets 24, which extend away from the aforementioned wall. InFIG. 3 , the number ofattachment brackets 24 is equal to three, but a greater or lesser number (preferably at least two) can be considered. Thesebrackets 24 are of identical shapes and are arranged in star, equidistant from each other to ensure a good balance (three legs arranged at 120° inFIG. 3 ). On the implementation example ofFIGS. 2 and 5 , thebrackets 24 are off center on the exterior wall of thehub 20, being closer to one of the edges of the aforementioned hub. In practice, the exterior wall of the hub does not have any obstacles between thebrackets 24 and the other edge. - Referring to
FIG. 2 , theattachment brackets 24 each comprise afront face 240 designed to be positioned against ashoulder 32 of thetread 3 and arear face 241 opposite to the aforementioned front face. In practice, the two front and rear faces 240 and 241 are parallel to each other and perpendicular to the common axis A of thehub 20, of theinternal bore 23 and of thetread 3. Preferably, thebrackets 24 are integral with thehub 20 by being shaped during the manufacturing process of the latter. It is however envisionable to bring thebrackets 24 on the exterior wall of thehub 20, fixing them for example by welding or by a mechanical linkage. One can provide in this case to make theattachment brackets 24 in a material other than that constituting thehub 20. Advantageously, thebrackets 24 are separated from each other (FIG. 3 ) so that air can possibly move between them. In an implementation variant not shown, theattachment brackets 24 are connected to each other, the connection between the aforementioned brackets can have axial orifices for the circulation of air. - Referring to
FIGS. 2 and 3 , the mountingattachment brackets 24 each comprise at least anaxial bore 25 for the passage of lockingscrew 4. Preferably each bore 25 opens on the two faces 240 and 241 of theattachment brackets 24. These bores 25 are arranged on a common concentric diameter with theinternal bore 23, are positioned at equal distance from each other and are parallel to the common axis A. Therear face 241 of thebrackets 24 is provided withribs 26 positioned on either side of theaxial bores 25, equidistant from the latter. In other words, each bore 25 opens advantageously in the middle of a groove (delimited by the two ribs 26) made on therear face 241. Theribs 26 are configured to axially stiffen theattachment brackets 24. - Referring to
FIGS. 2 and 4 , the tread 3 (or tire) is removably mounted on the exterior wall of thehub 20. Thetread 3 has a substantially cylindrical general shape. Preferably, thetread 3 is made entirely of rigid polyurethane obtained by molding. In the case where thetread 3 is made in part of soft polyurethane, the latter being capable of stretching under the effect of the centrifugal force, the aforementioned tread is advantageously made of bi-material: soft polyurethane on the periphery cast molded or bonded onto a rigid thermoplastic or aluminum type core. Thethread 3 can also be made of rubber with an interior air chamber tube mounted on an aluminum or thermoplastic rim. - The
tread 3 can have an internal bore 33 (FIGS. 4 a, 4 b) axially traversing the aforementioned tread from side to side and whose diameter is larger than the exterior diameter of theattachment brackets 24 of thehub 20. Acircular shoulder 32, positioned substantially in the middle of thebore 33, enables reception of thehub 20. Theshoulder 32 can be off centered, however. In practice, the interior diameter of theshoulder 32 is concentric with the exterior periphery of thetread 3 and substantially corresponds to the exterior diameter of thehub 20, so that thehub 20 is centered and therefore radially maintained in theshoulder 32. In other words, theinterior wall 320 of theshoulder 32 radially positions theexterior wall 220 of thehub 20. Referring toFIG. 4 a, theinterior wall 320 of theshoulder 32 is cylindrical. In an implementation variant shown inFIG. 4 b, theinterior wall 320 can be partially cylindrical, thus forming a reduced span for centering on thehub 20. Theshoulder 32 comprises afirst support face 330 and asecond support face 331, both of the aforementioned faces being parallel to each other and perpendicular to the common axis A. Thetread 3 is put in place on thehub 20 so that thefirst support face 330 acts to abut against thefront face 240 of theattachment brackets 24. Thetread 3 is thus axially positioned and centered on the aforementioned hub. As described in the following paragraph, it is essentially the lockingscrew 4 that provides the maintenance in axial position and prevents the rotation oftread 3 on thehub 20. - Referring to
FIG. 4 a, multipleaxial orifices 36 traverse theshoulder 32, from thefirst support face 330 to thesecond support face 331. Theseorifices 36 are distributed between the attachment points of thetread 3 to allow air circulation. They correspond to the empty spaces left between the fixingattachment brackets 24 and enable, by circulation of air, limitation of heatings due to high rotation speeds of the wheel. InFIG. 4 b, theorifices 36 extend and open into the interior diameter of theshoulder 32. In any event, fortreads 3 that are not subjected to high speeds, theorifices 36 are not mandatory. - The
tread 3 comprisesaxial bores 35 for the passage ofscrews 4. These bores 35 are arranged on a common diameter concentric with the interior diameter of theshoulder 32, are positioned at equal distance from each other and are parallel to the common axis A. They traverse theshoulder 32 from side to side, (that is to say, they open up on support faces 330 and 331) and are arranged to be positioned vis-a-vis thebores 25 of theattachment brackets 24 when thetread 3 is mounted on thehub 20. In this position, the locking screws 4 (or any other similar fastening means) can be inserted into thebores shoulder 32 from side to side and re-emerge at theattachment brackets 24 in order to lock thetread 3 in axially position and in rotation on thehub 20. Such a mounting enables compensation for all the dimensional plays betweentread 3 and thehub 20. In practice, the central part of thetread 3 comprising theshoulder 32 is designed so as not to creep while withstanding the stress of the pressure of the locking screws 4 and the stress of the effects of centrifugation due to the high operational rotation speeds. In particular, the width, thickness and material used to make theshoulder 32 will be selected by person of skill in the art so that the aforementioned shoulder is sufficiently rigid in order to not be subjected to creep under the compressive stress ofscrew 4 and under stress from medium or high centrifugal rotation speeds. One will note that the locking screws 4 are positioned at equal distance from each other, thus avoiding any imbalance on the wheel. To stiffen the periphery of the tread, the latter can include ribs (not shown) arranged between one of the support faces 330 and/or 331 of theshoulder 32 and theinterior wall 320 of the aforementioned shoulder theinternal bore 33. These ribs will be located at equal distance from each other and positioned between theaxial bores 35 of thetread 3, so as to obstruct neither the positioning of the screw heads 40, nor the installment of the aforementioned tread against theattachment brackets 24 ofhub 20. - In the mounting of
FIG. 2 , the screw heads 40 come into abutment against the firstsecond support face 330 331 of theshoulder 32. The other end ofscrews 4 re-emerge between theribs 26 made on therear face 241 of theattachment brackets 24 and are screwed into into a lockingnut 41. Theribs 26 are spaced so that thenut 41 can be lodged between the aforementioned ribs. In practice, locking nuts are used. It is not necessary to use a wrench to hold the nuts 41 during screwing, because theribs 26 are configured to block the rotation of the aforementioned nuts. In this attachment mode, bores 25, 35 are smooth. - In an implementation variant shown in
FIGS. 5 and 6 , thescrews 4 are screwed directly into theattachment brackets 24, without it being necessary to use locking nuts. In this case, theaxial bore 25 of theattachment brackets 24 is threaded. Theribs 26 are closer together than in the previous implementation mode so that the tapping extends on the interior flanks the aforementioned ribs. A permanent deformation is subsequently formed out on the exterior of the ribs 6 (with a press for example) so that they can approach each other. Thetappings 25 of thebrackets 24 are then no longer coaxial with tappings of theribs 26. And the screws, by introducing, act to pin up the ribs of 26 at their initial position. In this way, theribs 26 can exert a clamping (thus braking) force on thescrews 4, preventing the latter from unscrewing. For thus implementation mode, thehub 20 is preferentially made of steel. - Referring to
FIG. 2 and toFIG. 5 , theprotection washers 5 are positioned on thetruck 11, and are lodged in the interior of thebore 23 of thehub 20, on both sides of therollers 21. Thesewashers 5 comprise acircular lip 51 whose exterior diameter substantially corresponds (with a sufficient functional play) to the interior diameter of thebore 23. Once pressed against arollers 21, the axial end of thelip 51 is close (with a sufficient functional play) to the face of the exterior ring of the aforementioned rollers, the latter thus being completely protected. Thewashers 5 can be made from steel, aluminum, or rigid thermoplastic. They can also be bi-material, their central part being made of steel and their circular lip made of molded elastomer. Thus, the axial end of thelips 51 can act to lightly run against the exterior rings of therollers 21. - In practice, the mounting of the
wheel 12 in thetruck 11 is carried out in the following manner: therollers 21 are positioned on thebore 23 of the aforementioned hub. Afirst washer 5 is inserted on thetruck 11 so as to come to abut against ashoulder 110 of the aforementioned truck. The hub-roller mounting is inserted on thetruck 11 so as to act to abut against the previously installedwasher 5. The mounting is on thetruck 11 so that the side of thehub 20 bearing theattachment brackets 24 is first inserted for the aforementioned truck. In this way, theattachment brackets 24 are not an obstacle to the subsequent demounting of thetread 3. Thesecond washer 5 is inserted on thetruck 11 so as to act to abut against the interior ring of therollers 21. A locking nut is screwed on the threaded end of thetruck 11 so as to act to axially arrest the mounting assembly. Thenut 112 has an outside diameter less than the interior diameter of theshoulder 32 of thetread 3 so as not to obstruct the dismounting of the latter. Thetread 3 is then attached on thehub 20. To change thethread 3, it is not necessary to dismount the mounting assembly. It suffices to remove the lockingscrew 4 and axially pull on the aforementioned tread so as to slide out of thehub 20. The lockingnut 112 is thus no longer stressed during the changing of thetread 3. Its locking power will thus retain all of its operational effectiveness. - In summary, and in a nonlimiting manner, the device of the invention provides a hub having integrated rollers whose configuration enables full use of the capacity of the aforementioned rollers and avoidance of occurrence of heating problems. It also enables avoidance of entry of dust into the hub having integrated rollers. In addition, the user can mount, on a single roller having single integrated bearings, multiple types of tires having different characteristics: tire made of rigid material, tire made of flexible material, tire including an air chamber, etc. A simple and effective connection is provided between the hub having rollers and the tread, this connection integrating a compensation for all the dimensional plays between the aforementioned hub and the aforementioned thread. Any risk of loosening of the tread in operation is eliminated. The rising temperature of the tread rubbing on the ground is limited by promoting the flow of air in the mounting.
Claims (10)
1. A wheel device for skate board or roller skate comprising a wheel mounted on a truck, the aforementioned wheel comprising:
a single central hub having an exterior wall and a bore for the housing of rollers, the aforementioned rollers providing the connection with the aforementioned hub of the aforementioned truck,
a tread removably mounted on the exterior wall of the aforementioned hub, the aforementioned hub, the aforementioned interior bore and the aforementioned tread having a common axis,
characterized by the fact that:
the tread has a bore provided with a shoulder forming a housing for the hub, the aforementioned shoulder comprising an interior wall radially positioning the exterior wall of the aforementioned hub,
the aforementioned shoulder comprising a first support face and a second support face, the aforementioned two faces being parallel to each other and perpendicular to the aforementioned common axis,
the aforementioned tread being locked in rotation and in axial position on the aforementioned hub by means of locking screws, which screws comprise heads which abut against the second support face of the shoulder, the aforementioned screws traversing the aforementioned shoulder from side to side and attaching on the connecting means of the aforementioned hub.
2. A device according to claim 1 , wherein:
the hub comprises radial attachment brackets each comprising an axial bore for the passage of locking screws,
axial bores for the passage of locking screws traverse the shoulder from side to side through of the tread, the aforementioned bores being arranged so as to be positioned opposing bores of the attachment brackets when the aforementioned tread is mounted on the hub,
the locking screws traverse the bores of the attachment brackets and of the shoulder.
3. A device according to claim 2 , wherein the attachment brackets are connected to each other, the connection between the aforementioned brackets comprising axial orifices for air circulation.
4. A device according to claim 1 , wherein the tread comprises axial orifices for air circulation.
5. A device according to claim 2 , wherein the attachment brackets comprise a front face positioned against a support face of the tread and a rear face opposed to the aforementioned front face, the aforementioned rear face being provided with ribs arranged on both sides of the axial bore.
6. A device according to claim 5 , wherein the ribs are spaced so that a clamping nut of the locking screw can be housed between the aforementioned ribs.
7. A device according to claim 5 , wherein the axial bore of the attachment brackets is tapped, the aforementioned tapping extending on the interior flanks of the ribs.
8. A device according to claim 7 , wherein the tapping formed on the interior flanks of the ribs is not coaxial with the tapping in the attachment brackets, so that the aforementioned ribs exert a clamping force on the locking screw.
9. A device according to claim 2 , wherein the tread comprises ribs stiffening the periphery of the aforementioned tread, the aforementioned ribs being arranged between one of the support faces of the shoulder and the internal bore of the aforementioned tread, the aforementioned ribs being located at equal distance from each other and positioned between the axial bores of the aforementioned tread.
10. A device according to claim 1 , wherein protective washers are positioned on the truck, the aforementioned washers being housed in the interior of the bore of the hub, both sides of the rollers, the aforementioned washers comprising a circular lip whose exterior diameter substantially corresponds to the interior diameter of the aforementioned bore.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1156004 | 2011-07-04 | ||
FR1156004A FR2977502B1 (en) | 2011-07-04 | 2011-07-04 | WHEEL DEVICE FOR ROLLER BOARD OR SKATE |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130009448A1 true US20130009448A1 (en) | 2013-01-10 |
Family
ID=44802204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/541,728 Abandoned US20130009448A1 (en) | 2011-07-04 | 2012-07-04 | Wheel device for skate board or rolller skate |
Country Status (2)
Country | Link |
---|---|
US (1) | US20130009448A1 (en) |
FR (1) | FR2977502B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8801003B1 (en) * | 2010-09-08 | 2014-08-12 | Thomas Patrick Cassidy | Deck wheeled device |
US20140225419A1 (en) * | 2013-02-12 | 2014-08-14 | Tgm Distribution, Inc. | Wheel Bearing Assembly |
WO2016069081A1 (en) * | 2014-10-31 | 2016-05-06 | Compagnie Generale Des Etablissements Michelin | Wheel core assembly |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1554298A (en) * | 1924-09-22 | 1925-09-22 | Richardson Ball Bearing Skate | Wheel for ball-bearing skates |
US2649337A (en) * | 1949-06-08 | 1953-08-18 | Chicago Roller Skate Co | Roller structure |
US3992025A (en) * | 1975-11-17 | 1976-11-16 | Union Plastics West | Skate board and wheels therefor |
US4114952A (en) * | 1976-11-05 | 1978-09-19 | Mattel, Inc. | Wheel assembly for a skateboard or the like |
US4128254A (en) * | 1976-12-28 | 1978-12-05 | Powell George A | Skateboard wheels |
US4219240A (en) * | 1977-05-28 | 1980-08-26 | Skf Kugellagerfabriken Gmbh | Wheel for roller skates or the like |
US6619823B2 (en) * | 2000-08-11 | 2003-09-16 | Ming-Li Dai | Wheels with illuminating device |
US8801003B1 (en) * | 2010-09-08 | 2014-08-12 | Thomas Patrick Cassidy | Deck wheeled device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1100242A (en) * | 1912-02-16 | 1914-06-16 | Joseph Cobb Howells | Spring-wheel. |
GB191406752A (en) * | 1914-03-17 | 1915-02-18 | Frederick Herbert Wynne | Improvements in and relating to Roller Skates. |
-
2011
- 2011-07-04 FR FR1156004A patent/FR2977502B1/en active Active
-
2012
- 2012-07-04 US US13/541,728 patent/US20130009448A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1554298A (en) * | 1924-09-22 | 1925-09-22 | Richardson Ball Bearing Skate | Wheel for ball-bearing skates |
US2649337A (en) * | 1949-06-08 | 1953-08-18 | Chicago Roller Skate Co | Roller structure |
US3992025A (en) * | 1975-11-17 | 1976-11-16 | Union Plastics West | Skate board and wheels therefor |
US4114952A (en) * | 1976-11-05 | 1978-09-19 | Mattel, Inc. | Wheel assembly for a skateboard or the like |
US4128254A (en) * | 1976-12-28 | 1978-12-05 | Powell George A | Skateboard wheels |
US4219240A (en) * | 1977-05-28 | 1980-08-26 | Skf Kugellagerfabriken Gmbh | Wheel for roller skates or the like |
US6619823B2 (en) * | 2000-08-11 | 2003-09-16 | Ming-Li Dai | Wheels with illuminating device |
US8801003B1 (en) * | 2010-09-08 | 2014-08-12 | Thomas Patrick Cassidy | Deck wheeled device |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8801003B1 (en) * | 2010-09-08 | 2014-08-12 | Thomas Patrick Cassidy | Deck wheeled device |
US20140312589A1 (en) * | 2010-09-08 | 2014-10-23 | Thomas P. Cassidy | Deck wheeled device |
US9132338B2 (en) * | 2010-09-08 | 2015-09-15 | Thomas P. Cassidy | Deck wheeled device |
US20140225419A1 (en) * | 2013-02-12 | 2014-08-14 | Tgm Distribution, Inc. | Wheel Bearing Assembly |
US9149713B2 (en) * | 2013-02-12 | 2015-10-06 | TGM Distribution Inc. | Wheel bearing assembly |
WO2016069081A1 (en) * | 2014-10-31 | 2016-05-06 | Compagnie Generale Des Etablissements Michelin | Wheel core assembly |
Also Published As
Publication number | Publication date |
---|---|
FR2977502A1 (en) | 2013-01-11 |
FR2977502B1 (en) | 2014-05-09 |
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