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Excessive force proof scroll driver

A screwdriver and handle technology, which is applied in the field of overforced screwdrivers, can solve the problems of blade deformation and damage, and achieve the effect of prolonging the service life and being convenient to use

Inactive Publication Date: 2011-09-21
NINGBO YINZHOU YUNFAN ENG CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing screwdrivers usually deform and damage the blade due to excessive force when twisting, and the torque exceeds the yield strength of the blade

Method used

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Experimental program
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Effect test

Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0011] The anti-overforce screwdriver is made up of knife bar 1, knife handle 2, handle sleeve 3, pin 4, spring 5 and seal 6. Knife bar 1 and handle of a knife 2 become static fit relation. There is an annular groove on the handle 2, the depth of the groove is 1 / 3 of the wall thickness of the handle 2, the width of the groove is 0.05--0.1mm larger than the diameter of the spherical surface of the head of the pin 4, and there is a pit with a spherical bottom in the groove , the diameter of the pit is the same as the width of the groove, the junction of the pit and the groove forms an arc transition, the depth of the pit is 2 / 3 of the diameter of the head of the pin 4, the handle sleeve 3 is set on the handle 2, and they are dynamically matched with each other , Have a stepped through hole on the handle cover 3, this hole is facing the groove on the knif...

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PUM

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Abstract

The invention relates to a hardware tool, in particular to an over-force resistance screwdriver, consisting of a cutter rod, a cutter handle, a handle sleeve, a pin, a spring and a sealing. The cutter handle is provided with a ring-shaped trough which is internally provided with a hole having a spherical bottom; the diameter of the hole is identical to the width of the trough; the juncture of thehole and the trough forms an arc transition; the depth of the hole is two thirds of the diameter of the pin head; the handle sleeve is sleeved on the cutter handle so as to form a mutual movable match; the handle sleeve is provided with a step-shaped through hole which just faces to the trough which is arranged on the cutter handle; the through hole is sequentially provided with the pin, the spring and the sealing; the sealing compresses the spring and seals the spring in the hole. The screwdriver can automatically lead the excessive force which is exerted on the cutter handle to disappear when the cutter edge bears excessively large force, effectively protect the cutter edge from being damaged and prolong the service life of the screwdriver.

Description

technical field [0001] The invention relates to a hardware tool, in particular to an anti-overforce screwdriver. Background technique [0002] Existing screwdrivers usually have the situation that the edge of the blade is deformed and damaged due to excessive force when twisting, and the torque exceeds the yield strength of the edge of the blade. Contents of the invention [0003] In order to solve the deficiencies of the prior art, the present invention provides an anti-overforce screwdriver capable of slipping the screwdriver handle in time before the shear force received by the blade reaches the yield strength limit, thereby protecting the blade from damage. [0004] The solution to solve the technical problem of the present invention is: the anti-overforce screwdriver is made up of knife rod, knife handle, handle sleeve, pin, spring and seal. The knife rod and the handle of a knife form a static fit relationship. There is an annular groove on the handle, the depth of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25B23/143B25B23/14
Inventor 梁伟
Owner NINGBO YINZHOU YUNFAN ENG CONSULTING