| 摘要 |
A wheel-braking structure comprising a wheel body, a switch top-board and a braking block such that the switch top-board stops the braking block screw-fixed on wheel central shaft and thus brakes the wheels on both sides; wherein the switch top-board is mounted at a proper location on wheel body and has a hole on top such that braking block is screw-fixed on the central shaft of the wheel body, the movement of switch top-board causes the hole to move forward and backward; when the hole is aligned with braking block, wheels can move freely; when they are not aligned, the braking block is stopped by switch top-board and sets it in a lockup state. This not only facilitates operation but also achieves effective braking.
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