Monkey wrench

Abstract

The invention discloses a monkey wrench, including a wrench body and a worm wheel. The wrench body comprises a handle and a working portion. The working portion comprises a fixing portion, a movable portion, and a sliding groove. The lower end of the movable portion is arranged in the sliding groove. The bottom edge of the lower end of the movable portion is provided with a tooth portion. The working portion also comprises a hole. The worm wheel is arranged in the hole, and is meshed with the tooth portion. When the worm wheel rotates, the worm wheel and the tooth portion act, to drive the movable portion to move toward or far away from the fixing portion. Threads of the worm wheel have at least two spiral lines. The monkey wrench also comprises a pin shaft and a pin hole on the wrench body. The pin shaft passes through the pin hole and is axially arranged in the worm wheel. The worm wheel can rotate around the pin shaft. The side wall of the pin shaft has a groove. An elastic piece isarranged in the groove. An inner surface of the worm wheel has an abnormal shape surface, and the abnormal shape surface is arranged to be able to cooperate with the elastic piece so that the elasticpiece blocks rotation of the worm wheel. The monkey wrench can rapidly adjust distance between the movable portion and the fixing portion, and torque the worm wheel can bear is increased.

Description

technical field [0001] The invention relates to a wrench, in particular to an adjustable wrench. Background technique [0002] An adjustable wrench is generally composed of a wrench body, a worm gear, a pin shaft, a spring, etc., and is a tool for tightening or loosening angled screws or nuts. [0003] The wrench body includes a handle and a working part. The working part includes a fixed part, a movable part and a chute. The lower end of the movable part is arranged in the chute to move toward or away from the fixed part. The bottom edge of the lower end of the movable part is provided with teeth. The teeth mesh with the threads on the worm gear. Because the screw thread on the worm wheel meshes with the tooth portion of the bottom edge of the lower end of the movable part, turning the worm wheel can drive the movable part to move toward or away from the fixed part along the chute. [0004] In the prior art, there is one helix of the thread on the worm wheel, which is ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the helix of the thread on the worm wheel is one, which is a single-thread thread, and the speed of rotating the worm wheel to move the movable part is relatively slow, and the torque that the single-thread worm wheel can bear is small

In addition, during use, due to the force of the pull, sometimes the handle is knocked, causing the clamping opening between the fixed part and the movable part to become larger, resulting in loosening of the clamping, and damage to the edges and corners of the screw or nut. Causes the wrench to slip and prevents the screw or nut from being tightened or loosened

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