| 摘要 |
An adjustable jaw end power wrench, in which the adjustable jaw is operated by a worm gear, the worm gear is meshed with the rack of the movable jaw and the worm gear is driven by a reversible electric servomotor. Activation of the servomotor produces linear reciprocating motion of the adjustable jaw. Batteries in a wrench handle provide the power for the electric movement and a control switch controls the function of the wrench. The powered adjustable jaw wrench includes an anti-jamming coupling device provided for un-jamming the wrench when "binding" occurs between the adjustable jaw gear rack and the worm gear.
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