Wheel frame for a skateboard

Abstract

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.

Description

FIELD OF THE INVENTION [0001]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 INVENTION [0002]Skateboarding 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.[0003]As shown in FIG. 6, a conventional skateboard comprises: a board body 1 made of light and highly strong material, like wood, plastic, carbon fiber and glass fiber; and two wheel frames 2 (only one wheel frame 2 shown) set on both ends of the board body 1, wherein a pair of slipping wheels 3 are mounted on each wheel frame 2 for slipping on the floor.[0004]As shown in the FIGS. 6 and 7, a conventional skateboard wheel frame 2 has a T-shaped form, wherein there is a tube hole for putting through an axle 4. The axle 4 is an rod in one pi...

AI Technical Summary

Benefits of technology

[0009]The 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.

[0010]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.

[0011]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.

Problems solved by technology

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.

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.

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