Wrench that can warn of torque overrun and method for fastening screws using the wrench

Abstract

The invention discloses a wrench capable of giving an over-limit twisting force warning and a method for tightening a screw through the wrench, and aims to provide a wrench which is convenient to useand can warn that the twisting force is too large and beyond the limit, and a screw tightening method. An opening groove is formed in the upper portion of the position, close to a wrench head, of a wrench handle, the positions, close to the bottom, of the two end faces of the opening groove are provided with fixing holes, and an elastic twisting force plate is arranged between the fixing holes; the opposite positions, close to the two end faces of an opening, of the opening groove are provided with a fastening transverse groove and a limit transverse groove correspondingly; the fastening transverse groove is internally provided with an elastic warning sheet made of spring steel or tin bronze in a matched mode; when the wrench tightens the screw with too large force, the elastic twisting force plate is deformed, when the twisting force is beyond the limit, one end of the elastic warning sheet bounces off the interior of the limit transverse groove and generates sound through vibration,and then, an operator knows that the twisting force is beyond the limit and stops screw tightening; and the operator does not need to keep a watchful eye on the wrench and can quite easily know that the twisting force is beyond the limit, and operation is very easy.

Description

technical field [0001] The invention relates to the technical field of hardware tools and appliances, more specifically, a wrench capable of warning of torque overrun and a method for fastening screws using the wrench. Background technique [0002] During mechanical assembly, when some workpieces are fastened with screws, they need to meet certain tightening torque requirements. At present, force measuring wrenches are generally used for tightening operations. However, due to the complex structure of existing force measuring wrenches, the production cost Higher, when using it, it is necessary to always pay attention to whether the torque exceeds the requirement, especially when it is used in a small environment, it is difficult to observe whether the torque exceeds. A "torque force measuring wrench" disclosed in Chinese patent literature, the publication number of which is CN104280172A. The "torque force measuring wrench" in this technical solution includes a housing, and an...

AI Technical Summary

Problems solved by technology

[0003] The present invention is dedicated to solve the problem that the existing force measuring wrench needs to always pay attention to whether the torque exceeds the requirement when using it, especially when it is used in a small environment, it is difficult to observe whether the torque exceeds the requirement, and there is a problem that the torque is too large when tightening the screw with the torque requirement or insufficient torque

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