| 摘要 |
The screwdriver has a handle (20) and a shaft (60). A box (47) with at least one cam surface (49) is fixed in the handle. The box contains a cage with at least one slot to receive at least one roller pair (43, 44). A shaft (51) has its rear sector (511) in the cage and is against one of the rollers (44). There is a shell (52) on the shaft, against the other roller (43). There are two plates (523, 524) in a drum (10) in which three pairs of pinions and gear wheels are fitted. The shell has another gear wheel engaged with the first pinion (541). The shaft has another pinion (512), engaged with the first gear wheels (542) and a rod (60).
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