| 摘要 |
PROBLEM TO BE SOLVED: To provide a booster wrench capable of being stably operated by one hand. SOLUTION: In the booster wrench 1, a working lever 5 for increasing a force exerted to a grappling part 31 by a lever principle is mounted to an operating lever 3 having the grappling part 31, and the head of a bolt or an engaging member 2 engaging with a nut is rotated in one direction by the force increased by the working lever 5. The booster wrench 1 has a reaction force member 4 that is turnably mounted to the operating lever 3 and the engaging member 2 to connect the operating lever 3 with the engaging member 2 and is fixed in operating the operating lever 3 to exert a reaction force to the operating lever 3. During the operation of the operating lever 3, the operating lever 3 obtains the reaction force from the reaction force member 4 and stably turns about a connection part with the reaction force member 4. Therefore, the booster wrench 1 can stably be operated by one hand. COPYRIGHT: (C)2004,JPO
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