| 摘要 |
PURPOSE: A wrench having a movable single sawtooth unit is provided to continuously tighten a nut without separating the wrench from the nut by installing the movable single sawtooth unit at the opening part of the wrench. CONSTITUTION: A head unit(1) includes two jaws(3,10). A first sawtooth(4) is formed at one jaw(3). A guide groove(11) is formed at the other jaw(10), and has protrusion units(12). A movable sawtooth unit(20) moves along the guide groove, and has a second sawtooth(21). A handle(2) is connected to the head unit. The position of the movable sawtooth unit is fixed, and simultaneously, a nut moves integrally with the head unit by the second sawtooth and the protrusion units when the head unit is rotated in a direction. The movable sawtooth unit moves, and the nut slides from the head unit when the head unit is rotated in a contrary direction.
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