| 摘要 |
A movable member carrying a movable jaw toward and away from a fixed jaw is reciprocated by means of a worm in the well-known manner. A drive mechanism for the worm includes a shaft with a helical groove rotatably mounted in the handle, and a thumb actuated button mounted for reciprocating movement and including a boss extending into the helical groove for rotating the shaft. The helical shaft drives the worm through mating gears.
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