| 摘要 |
A unidirectional bucking device of a ratchet wrench comprises a wrench body, a ratchet wheel, a brake block, an elastomer, and a plug cover. An outer periphery of the ratchet wheel is formed with a teeth portion and an inner side of the ratchet wheel is formed with a clamping seat. One end of the brake block is formed as a braking surface. A taper space with an apex having an angle is formed between the braking surface and the receiving groove so that when the brake block is engaged and braked by the ratchet wheel. The brake block moves through a small extent so as to adjust the engagement of the teeth portion and the ratchet teeth portion and the teeth portion, and the ratchet wheel are hidden within the receiving groove.
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