| 摘要 |
A ratchet drive mechanism is disclosed. In the preferred and illustrated embodiment, it includes a handle and ratchet drive mechanism for rotating a bolt. It rotates the bolt through torque applied to the handle. In addition, it incorporates a bidirectionally operable reciprocating means for driving the bolt. The handle supports a drive chain which rotates around a pair of sprockets. A push rod supports a lock means which engages the chain. It hooks against the chain, thereby enabling the chain to be pushed and pulled on alternate strokes. The chain is thus rotated around the sprockets, one of the sprockets being an idler and one of the sprockets being mounted on the exterior of the drive of the mechanism. When low torque is required, the push rod can be manipulated. When high torque is required, the handle can be used.
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