WHEEL FRAME FOR A SKATEBOARD
An improved wheel frame for a skateboard, wherein slipping wheels connect with a skateboard body stably, comprises: a wheel frame main body having a screw hole on each side; two wheel axles for screwing in the screw hole of the wheel frame main body, wherein in each axle a through hole is set, the through hole has at least one longitudinal expansion joint in the thread for flexible expanding the diameter; and an expansion element for setting in the through hole of the both axles, wherein the diameter of the thread within the axle is forced to expand, so that the thread of the axles and the screw holes of the wheel frame main body are firmly held together.
The present invention relates to an improved wheel frame for is skateboard, particularly to a wheel frame for a skateboard applied to extreme sports.
BACKGROUND OF THE INVENTIONSkateboarding is a kind of popular sports, which spread to all countries. Time and again new skills and pop elements are added in skateboard sports. Therefore the manufacturers endeavor again and again to make improvements and innovations.
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However, a conventional wheel frame for skateboards still has several disadvantages. Firstly, only on the one end of the axle 4 with the longitudinal thread 5 occluding the tube hole of the wheel frame 2 is a stable locating achieved, while the other end without longitudinal thread gets gaps therebetween which resulting swaying. Hence, if slipping wheels on the unoccluded end of axle are loaded, the right and left slipping wheels are not in balance and swaying occurs easily. Axial movement bring the axle to loose from the wheel frame, with potentially dangerous results.
In conventional art, a hollow structure or light metal materials like titanium alloy are used for lightening the axle 4. However, since the axle 4 has a large length, manufacturing of a hollow structure is difficult and expensive. In case titanium is used, the costs of material increase. Accordingly, a conventional wheel frame for skateboard needs high costs for lightening.
According to the reasons mentioned above, a conventional wheel frame for skateboard still has disadvantages and needs improvement.
SUMMARY OF THE INVENTIONThe main objects of the present invention are to provide a wheel frame for a skateboard, wherein swaying and loosening occuring by axle fixation in a conventional wheel frame for a skateboard are reduced and wherein the problem of lightening the axle is solved.
In the present invention, the axle is converted into two parts, which are locked on the both ends of the wheel frame. At the same time, the threads of both axles are designed as hollow and expandable structure, wherein a expansion element is set at the center for extending the diameter of the thread in the axles and thereby occluding with the screw hole in the wheel frame, so that both axles neither loosen nor rotate. Accordingly, a stable setting of the both axles in a wheel frame is achieved.
In the present invention the axles on each end of the wheel frame are stably set in the frame body, so swaying and loss of balance of the slipping wheels caused by unstable fixation of the axles are avoided. The two axles are shorter then a conventional one-piece axle, thereby material consumption is reduced and costs for manufacturing a hollow structure are reduced. Hence lightening of the axle is achieved.
Other aspects and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the present invention.
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By the effects of the expansion joint 27 and the expansion element 30, both wheel axles are stably fixed in the screw hole 12, hence the both wheel axles 20 are stably set on the both ends of the wheel frame main body 10.
Im comparison to prior art, the axles of the present invention are a separated structure in two pieces, wherein the length of both axles 20 measures only one third, as compared to prior art, moreover it is a hollow structure, thus the total weight is reduced.
Furthermore, both wheel axles 20 are firmly fixed in the screw holes 12 of the wheel frame main body 10 through the expansion element 30. Additionally, the both axles 20 are fixed with the wheel frame main both 10 in the same way, wherein the force keeps balance; unlike the wheel axles of a conventional skateboard, wherein only one end is fixed on the wheel frame, while on the other end gaps easily cause swaying and loosing under stress.
Claims
1. An improved wheel frame for a skateboard, wherein slipping wheels connect with said skateboard body stably, comprising:
- a wheel frame main body, which is set under said skateboard body, having a slipping wheel on each end;
- characterized by: said wheel frame main body having a screw hole on each end and two wheel axles, which are firmly screwed on both ends in said wheel frame main body for mounting said slipping wheel.
2. The improved wheel frame for a skateboard of claim 1, wherein each wheel axle has a first end with a thread on an outer side for screwing in said screw hole on each end of said wheel frame main body.
3. The improved wheel frame for a skateboard of claim 2, wherein each wheel axle has a through hole at said center for forming a hollow structure.
4. The improved wheel frame for a skateboard of claim 3, wherein said wheel axle at said first end has at least one longitudinal expansion joint, and said through hole at said position of said first end has a stage part with a narrower diameter.
5. The improved wheel frame for a skateboard of claim 4, wherein in said through hole of said wheel axle an expansion element having a larger diameter than that of said stage part is set; if said expansion element is pressed in said stage part, said external diameter of said first end is forced to expand and thereby said thread of first end and said screw hole of said wheel frame main body occlude firmly.
6. The improved wheel frame for a skateboard of claim 5, wherein said expansion element is a cylinder with a cone on one end.
7. The improved wheel frame for a skateboard of claim 1, wherein each wheel axle has a through hole at said center for family a hollow structure.
8. The improved wheel frame for a skateboard of claim 7, wherein said wheel axle at said first end has at least one longitudinal expansion joint, and said through hole at said position of said first end has a stage part with a narrower diameter.
9. The improved wheel frame for a skateboard of claim 8, wherein in said through hole of said wheel axle an expansion element having a larger diameter than that of said stage part is set; if said expansion element is pressed in said stage part, said external diameter of said first end is forced to expand and thereby said thread of first end and said screw hole of said wheel frame main body occlude firmly.
10. The improved wheel frame for a skateboard of claim 9, wherein said expansion element is a cylinder with a cone on one end.
Type: Application
Filed: Jun 6, 2013
Publication Date: Dec 11, 2014
Applicant: GOOD-MEN ASSOCIATES INC. (New Taipei City)
Inventor: ROGER YIN (New Taipei City)
Application Number: 13/911,081