Patent ID: 6811165
Filing Date: 2004-11-02
Classification: A63C

Abstract:
A brake structure for a skateboard having two wheel shafts, and wheels mounted at two ends of each wheel shaft, the brake structure being mounted between a wheel and a wheel shaft for controlling a braking effect of the wheel, wherein the brake structure comprises:a casing having a cavity with an opening facing outward, the casing being fitted on one end of the wheel shaft and located on an inner side of one end of the wheel shaft without rotating; two brake members which are arched bars pivotally connected with each other and swingable in the cavity of the casing, the two brake members being oppositely arranged to form a circular pattern, free ends of the brake members being openable and closable, brake linings being respectively fixedly arranged on outer circumferences of the brake members; a resilient member received in the cavity of the casing between the brake members, when the free ends of the brake members are not pressed outwardly by an external force, the resilient member moves the free ends of the brake members to a closed position; a rotary shaft having a driving section at one end, the rotary shaft being rotatably disposed in the casing, the axial direction of the rotary shaft being parallel to the axial direction of the wheel shaft, the driving section being positioned in the cavity, the free ends of the brake members touching two sides of the driving section, whereby when the rotary shaft is rotated, the driving section drives the two brake members; a rocking arm positioned on an outer side of the casing, another end of the rotary shaft extending through the casing to connect with the rocking arm, whereby the rocking arm is synchronously rotatable with the rotary shaft; a controlling assembly connected with the rocking arm and manually controllable for controlling swinging of the rocking arm; and an annular wall projecting from an inner side of the wheel, the casing covering the annular wall with the annular wall accommodated in the cavity, the two brake members being positioned in the annular wall, the brake linings being spaced from the inner face of the annular wall; whereby the brake structure is hidden in the wheel and by means of operating the controlling assembly, the rotary shaft rotates such that the driving section drives the free ends of the brake members and stretches open the brake members and under such circumstance, the brake linings exert a frictional force against the inner face of the annular wall to create brake effect.