CA1075278A - Wheel assembly for a skateboard or the like - Google Patents

Wheel assembly for a skateboard or the like

Info

Publication number
CA1075278A
CA1075278A CA290,221A CA290221A CA1075278A CA 1075278 A CA1075278 A CA 1075278A CA 290221 A CA290221 A CA 290221A CA 1075278 A CA1075278 A CA 1075278A
Authority
CA
Canada
Prior art keywords
hub
tire
cap
central aperture
wheel assembly
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.)
Expired
Application number
CA290,221A
Other languages
French (fr)
Inventor
Steven D. Kimmell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mattel Inc
Original Assignee
Mattel Inc
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 Mattel Inc filed Critical Mattel Inc
Application granted granted Critical
Publication of CA1075278A publication Critical patent/CA1075278A/en
Expired legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63CSKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C17/00Roller skates; Skate-boards
    • A63C17/01Skateboards
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63CSKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C17/00Roller skates; Skate-boards
    • A63C17/22Wheels for roller skates
    • A63C17/226Wheel mounting, i.e. arrangement connecting wheel and axle mount

Abstract

Abstract of the Disclosure A wheel assembly for a skateboard or the like, the wheel assembly having a cylindrical hub with a central aperture having a bearing receiving end and an internally threaded end. A tire having a central aperture with a main portion and an enlarged recess adjacent one end thereof, the main por-tion and the outer surface of the hub being matingly configured to prevent relative rotation therebetween with the tire mounted on the hub. A hub cap is provided with a threaded body for matingly engaging the internally threaded end of the hub, and a cap portion configured for being received within the recess of the tire, the outer periphery of the cap portion and the inner periphery of the recess being matingly configured with detent menas so that upon securing the wheel to the hub the hub cap is prevented from loosening.

Description

~(~75~78 This invention relates to wheel assemblies and more particularly to a wheel assembly f`or a skateboard, roller skate, or the like.
With the rapid rise in popularity of the sport of skateboarding, many different types of construction o~ skateboards, skateboard trucks and wheels have been developed. Due to competative skateboard events, speeds have increased and numerous refinements have been made in construction materials as well as construction techniques. Speeds for general usage of skateboards average fifteen miles p~r hour while in pure speed events, skateboard riders have recorded speeds in excess of sixty miles per hour. Consequently, wheel construction has become increasingly important. The most readily available wheel construction has a urethane tire with a central aperture having press fit therein ball bearings, or alternatively, the tire is molded around the bearings. Another type of construction utilizing urethane wheels incorporates a metal race within the aperture for the utilization of loose ball bearings.
In either of these two constructions, the metallic portion comprises a diameter which is relatively small compared to the overall diameter of the wheel re-sulting in a thic~ tire. With construction of this type, at high speeds, the bearing portion tends to separate from the surrounding urethane due to the repeated flexing, and either effects slippage between the tire and the bearing portion, misalignment of the bearing with respect to the tire or complete se-paration of the tire from the bearings, resulting in unstable or unsafe operating conditions.
Futhermore, with current tires having very thick urethane construc-tion, in order to provide such tires with sufficient traction, they are made of a very soft urethane material. That material deforms at rolling speeds just ahead of the contact point of the tire with the surface upon which it is rolling, resulting in the material bunching up or bulging forward during the rolling. As the material deforms and reforms, internal heat is being gener-ated through internal friction, thereby slowing the wheel down.

- l_ Another wheel construction currently on the market is sold by Apex Sports Products of La rliradal California. This wheel asse~bly incorporates a larger diameter hub resulting in a thinner tire, which is secured to the hub by molding or bonding.
The tire is non-removable and made from a harder composition of urethane. If it is chipped, gouged, scraped or worn out, the entire wheel must be replaced.
It has been found that certain of the deficiencies in prior art devices may be minimized or eliminated by the invention relating to a wheel assembly for a skateboard or the like which, in a broad aspect, resides in the combination comprising: a hub having a central aperture with a bearing receiving end and an internally threaded end, the outer surface of said hub being provided with a plurality of spaced longitudinally extending ribs and a flange adjacent said bearing receiving end; a tire of a generally flexible material having a central aperture with a main portion and an enlarged recess, said main portion having groov~s slidably engaging the ribs on the outer surface of said hub to prevent relative rotation therebetween; and a hub cap having a threaded portion and a cap portion having generally the same diameter as said recess, said threaded portion engag-ing the threaded end of said hub, said recess being provided with radially inwardly extending integral detent means about the periphexy thereof and said cap portion being provided with radially projecting ridge means of a length to engage and resiliently distort said detent means when rotating said threaded portion relative to said threaded end whereby to secure said tire to said hu~ and prevent loosening of said hub cap.
The features of the present invention which are believed to be novel are set forth with particularity in the ap-~ - 2 -1~7SZ78 pended claims. The present invention, both as to its organi~-ation and manner of operation, may best be understood by reference to the following description when taken in conjunction with the accompanying drawings in which like-reference characters refer to like elements in the several views.
In drawings which illustrate an embodiment of the invention, Figure 1 is a perspective view of a skateboard;
Figure 2 is an exploded perspective view of the wheel assembly - 2a -,.,~..

1~75278 according to the invention;
Figure 3 is a side elevation of the hub of the wheel assembly of Figure 2;
Figure 4 is an end view of the ~ub of Figure 3;
Figure 5 is a cross-sectional view taken along line 5-5 of Figure 4;
Figure 6 is a cross-sectional view of the hub taken along line 6-6 of Figure 3;
Figure 7 is a rear elevation of the tire of the wheel assembly of Figure 2;
Figure 8 is a front ele~ation of the tire;
Figure 9 is a cross sectional view of the tire taken along line 9-9 of Figure 7;
Figure 10 is a s~de elevation of the hub cap of the wheel assembly of Figure 2;
Figure 11 is a rear elevation of the hub cap of Figure 10;
Figure 12 is a front elevation of the hub cap of Figure 10;
Figure 13 is a cross-sectional view of the hub cap taken along line 13-13 of Figure 12 and showing a tool (partially broken away) for attaching the hub cap; and Figure 14 is a cross-sectional view showing the wheel assembly in its assembled condition.
~eferring now to the drawings and particularly to Figure 1, there is shown a skateboard including a board 20 adapted for supporting a rider, the ~ooard 20 being provided on the under surface thereof with skateboard trucks 22 (only one of which is shown), the trucks 22 containing axles for supporting a pair of wheels 24 on each of the trucks 22. Skateboards of this type originally started out as amusement devices with the wheels generally being of the type employed in roller skates. However, with the advent of competitive skateboarding events, the wheels have been subJect to more abuse by higher 1(~75Z78 speeds being attainable with the newer wheels designed for skateboards. The materia] composition now utilized generally for such skateboard wheels is urethane which is resilient and flexible while still maintaining a degree of rigidity and durability for the various surfaces on which the skateboard will be employed.
Shown in Figure 2 is a wheel assembly according to the invention which shows a partial skateboard truck 22 having an axle 26 with a threaded portion 28 at the free end thereof. A hub generally designated 30 receives over the outer surface thereof a removable tire generally designated 32. The hub 30 is mounted on the axle 26 with the axle 26 extending through a central aperture 34 with a locking nut 36 engaging the threaded portion of the axle 26. As will be discussed hereinafter, the aperture 34 contains suitable bearing means so that the hub 30 is rotatably mounted on shaft 26. The tire 32 is then suitably fitted on the hub 30 and a hub cap 38 is threadably re-ceived by a mating portion within aperture 34 of hub 30 to retain the assembly in position. As shown in Figures 2 through 6, the hub 30 is generally cylindrical in form and has a first end having a f~ange 40, this end being positioned on axle 26 with the flange 40 nearest the truck 22. Formed on the surface of the hub 30 is a plurality of longitudinally extending ribs 42, that is, in a direction in alignment with the axis of hub 30. As can be seen in Figures 4 and 6, in cross section, the ribs 42 extend radially outwardly from the surface of hub 30.
The aperture 34 (see Figure 5~ has a bearing receiving portion 44 adapted for receiving, in press fit relationship, a pair of preaision ball bearings 46 and 48 with the aligned apertures thereof adapted for receiving the axle 26. The outer end of aperture 34 has an internally threaded portion 50 adapted to receive the hub cap 38. As can be seen, the bearings 46 and 48 are in metal-to-metal contact with the ad3acent inner surface 44 of aperture 34 of hub 30 to provide a positive engagement of the bearings, While encased 107S2~8 ball bearings are shown, it is to be understood that the bearing receiving portion 44 can be eonfigured, by molding or by separate part, for containing a metallic race for receiving loose bearings if desired.
Referring now to Figures 2 and 7-9 the tire 32, which can be formed from a relatively soft urethane material, has a central aperture 52 which is circular with radially extending longitudinal grooves 54 configured for mating-ly engaging the ribs 42 of hub 30. The aperture 52 has three portions, a flange receiving recess portion 56, the grooves portion 58 and a slightly enlarged recess portion 60. The axial length of the flange portion 56 plus the grooves portion 58 is substantially identical to the axial length of hub 30, the flange 40 of hub 30 matingly fitting within flanged portion 56 when the ribs 42 of the hub 30 are in engagement with the grooves 54 of groove portion 58, the outer end of hub 30 terminating at approximately the juncture of the groove portion 58 with the recess portion 60. The aperture 52 is provided with a slight taper from the flange receiving end 56 toward the recess 60, the hub 30 being provided with a similar taper, although the tapering is not necessary to the invention.
As can be seen by comparing ~igure 4 with Figure 8, the inner sur-face of aperture 52 is generally circular in cross section for receiving the main body portion of hub 30 which is similarly configured. Although a circular configuration is shown, the mating surfaces of hub 30 with aperture 52 and the corresponding ribs 42 and grooves 54 may have other configurations which effect a removable tire and the retention of the tire on the hub to prevent relative movement therebetween. This enables a user to change tires without the need for changg~g the entire wheel. Various wheels of different composi-tions may~ih~ve different characteristics on different surfaces and the wheel assembly shown and described would permit the user to select the tires accord-ingly. Furthermore, since the tire is made of a composition which is less durable than the bearing and hub assembly, surface abrasions or chips in the ~075'~78 tire are less expensively remedied by a change of the tire alone.
The recess portion 60 of tire 32 has a shoulder portion 64 formed by the adjacent end of the grooves portion 58 and a circular peripheral surface 66 which has formed therein a plurality of ridges 68 extending in an axial direction and disposed about the periphery of surface 66. The adjacent outer edge of tire 32 has an outwardly extending tapered portion 7~.

Referring now to Figures 10-13 the hub cap 38 will be described and includes a cylindrical cap portion 72 and a reduced diameter threaded body portion 74, the threaded portion 74 being adapted to engage the internally threaded portion S0 of aperture 34 of hub 30. Formed within the cap 72 is a plurality of detents 76, the nu~ber of detents 76 corresponding to the number of ridges 68 formed within recess 60 of tire 32, although fewer detents could be utilized so long as at least a sufficient number of detents 76 engage the ridges 68 to prevent loosening.
Upon tightening down of the hub cap 38 on hub 30, the detents 76 ride over the ridges 68 formed within the recess 60 of the tire 32 in frictional engagement so that upon complete tightening of the hub cap 38, each of the ridges 68 will rest in a corresponding detent 76 to prevent hub cap 38 from loosening during operation of the wheel assembly. The threaded portions 74 can be identical for all four wheels by the utilization of the configuration as shown with the mating detent and ridge arrangement which prevents looseni~g.
In this way, right hand threads and left hand threads are not necessary for opposite sides of the skateboard.
The outer exposed surface of hub cap 38 is provided with a plurality of axially extending recesses 78 and a central aperture 80, the recesses 78 and aperture 80 providing an esthetically pleasing exterior appearance which is in the nature of a "mag wheel". In addition to the esthetic nature of recesses 78, as shown in Figure 13, a wheel tool 82 is provided with a handle portion and a pair of prongs 84 configured for fitting within diametrically ~075'~78 opposite r~cesses 78 to enable the user to assemble the hub cap 38 to the wheel assembly, The inner surface of the hub cap 38 is provided with an enlarged opening 86, which is slightly larger than the lock nut 36, which secured the hub 30 to the axle 26.
Referring now to Figure 14, the wheel assembly is shown in cross section in the assembled condition with the hub 30 mounted on shaft 26 of truck 22 with a washer 23 interposed therebetween. The hub 30 is maintained in position by the lock nut 36 engaging the threaded portion 28 of axle 26. The tire 32 is then fitted over hub 30 with the grooves 54 thereof engaging the ribs 42 and the flange receiving portion 56 of aperture 52 of tire 32 abutting against flange 40 of hub 30. The hub cap 38 has the threaded portion 74 there-of engaging the internally threaded portion S0 of the hub aperture 34 until the circular shoulder of cap portion 72 abuts against the end surface of hub 30.
At this point, the detents 76 about the periphery of cap portion 72 matingly engage the ridges 68 formed on the circular surface of the enlarged recess 60 of the tire 32 for frictional retention therein. As can be seen, the hub cap 38, the hub 30 and the tire 32 rotate as a unit about the axle 26 by means of the bearings 46 and 48. The resulting wheel assembly is capable of having the tire 32 removed and readily interchanged with other tire members of different material construction, or if desired, of different colors. With the bearings 46 and 48 positioned within the central aperture of the metal hub 30, the li~slihood of misalignment or separation of the bearings from the hub 30 is greatly minimized if not substant ally eliminated. The length of hub 30 is such to substantially fully support the load-bearing portion of tire 32. Ad-ditionally, due to the large amount of hub 30 surface coacting with the tire 32 by means of the ribs 42, a positive nonadhesive bond is established between the tire 32 and hub 30, which improves the riding ~ualities of the wheel assembly shown. Furthermore, because of the large amount of outer surface area of the hub 30 and the ribs 42 heat ~enerated by the roller bearing 46 and 48 is 107S'~78 dissipated more readily due to the large mass of metal. The material composi-tion of tire 32 is relati~ely soft urethane with the amount of thickness of the material in tire 32 between the hub 30 and the periphery of tire 32 being re-duced,thereby resulting in a tire 32 which provides good traction and resists deformation during high speed operation resulting in a more stable wheel as-sembly than that heretofor provided.
While there has been shown and described a preferred embodiment, it is to be understood that various other adaptations and modifications may be made within the spirit and scope of the invention.

Claims (4)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a wheel assembly for a skateboard or the like, the combination comprising:
a hub having a central aperture with a bearing receiving end and an internally threaded end, the outer surface of said hub being provided with a plurality of spaced longitudinally extending ribs and a flange adjacent said bearing receiving end;
a tire of a generally flexible material having a central aperture with a main portion and an enlarged recess, said main portion having grooves slidably engaging the ribs on the outer surface of said hub to prevent relative rotation therebetween; and a hub cap having a threaded portion and a cap portion having generally the same diameter as said recess, said threaded portion engaging the threaded end of said hub, said recess being provided with radially inwardly extending integral detent means about the periphery thereof and said cap portion being provided with radially projecting ridge means of a length to engage and resiliently distort said detent means when rotating said threaded portion relative to said threaded end whereby to secure said tire to said hub and prevent loosening of said hub cap.
2. The combination according to Claim 1 wherein said hub outer surface and said tire central aperture are generally circular in cross section.
3. The combination according to Claim 2 further including ball bearings within said bearing receiving end of the central aperture of said hub.
4. The combination according to Claim 3 wherein said cap portion of said hub cap is provided with at least two axially extending recesses on the outer surface thereof for receiving a tool for rotating said hub cap to assemble said wheel assembly.
CA290,221A 1976-11-05 1977-11-04 Wheel assembly for a skateboard or the like Expired CA1075278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/739,073 US4114952A (en) 1976-11-05 1976-11-05 Wheel assembly for a skateboard or the like

Publications (1)

Publication Number Publication Date
CA1075278A true CA1075278A (en) 1980-04-08

Family

ID=24970690

Family Applications (1)

Application Number Title Priority Date Filing Date
CA290,221A Expired CA1075278A (en) 1976-11-05 1977-11-04 Wheel assembly for a skateboard or the like

Country Status (6)

Country Link
US (1) US4114952A (en)
CA (1) CA1075278A (en)
DE (1) DE7733798U1 (en)
FR (1) FR2369855A1 (en)
GB (1) GB1588457A (en)
IT (1) IT1114444B (en)

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Also Published As

Publication number Publication date
GB1588457A (en) 1981-04-23
FR2369855A1 (en) 1978-06-02
IT1114444B (en) 1986-01-27
DE7733798U1 (en) 1978-02-16
US4114952A (en) 1978-09-19

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