| 摘要 |
A ratchet tool, including a shaft defining a longitudinal axis; a handle coaxial to the shaft; a first gear immovably fixed to the shaft and disposed in the handle; a second gear rotatably and longitudinally movable with respect to the shaft, where the second gear engages the first gear to limit torque transfer from the handle to the shaft in a first direction and provides substantially zero torque transfer in a second direction; a first spring disposed between the second gear and the handle; a third gear rotatably and longitudinally movable with respect to the shaft, where the third gear engages the first gear to limit torque transfer from the handle to the shaft in the second direction and provides substantially zero torque transfer in the first direction; and a second spring disposed between the third gear and the handle.
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