| 摘要 |
A ratchet braking structure, designed to solve the problem that a conventional braking pawl cannot resume its actuating position without a torsion spring, includes a ratchet wheel and a pair of pawls provided on two opposite sides of the ratchet wheel respectively. Each pawl has a center of rotation and two opposing end portions symmetrically provided with respect thereto, wherein the two end portions are an engaging end for engaging with and thereby locking the teeth of the ratchet wheel and a balancing end for enabling pawl position restoration. The engaging end of one pawl is diagonally opposite that of the other. The balancing end of each pawl extends from the side opposite the engaging end and can be pushed outward by the teeth of the ratchet wheel so that, even without additional position restoration means, the engaging end will stay where it can engage with the ratchet wheel.
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