Thorn wrench for preventing tooth breakup

Abstract

The invention relates to a thorn wrench for preventing tooth breakup. A connecting part of a control member is provided with at least two elasticity positioning assemblies; at least two positioning units support against an abutting part of a thorn member simultaneously so that a ratchet of the thorn member can be engaged on a driving tooth of a driven body at high speed to avoid tooth breakup caused by stress concentration; at least two elasticity positioning assemblies arranged on the control member support against the thorn member, thereby overcoming oil stain prevention between the thorn member and the driven body and solving the tolerance problem of poor parallelism or verticality among a holding hole, a control slot and a thorn slot inside the body so that the upper part and the lower part of the thorn member are simultaneously engaged in the driven body, the function of high-speed engagement is achieved, the engagement stability is improved, and tooth breakup is reduced.

Description

technical field [0001] The invention relates to a ratchet wrench, in particular to a ratchet wrench capable of increasing the meshing speed between the ratchet teeth of the ratchet part and the driving teeth of the drive body, and avoiding the defect of tooth chipping caused by stress concentration. Background technique [0002] Please refer to Figure 1 to Figure 3 , is a traditional box wrench 6, which has a toggle button 1 that can drive a pin 2 to swing, and the pin 2 is pushed by a spring 3 to contact the pawl 4, so that the pawl 4 can be engaged in ratchet 5 outer periphery. [0003] When using this traditional box wrench 6, the user can switch the direction of the dial 1 to achieve the function of toggling the pawl 4, and obtain the effect of switching the rotation direction of the ratchet 5, which is convenient for tightening or loosening work. [0004] During the tightening work process, with figure 2 From the point of view, when the wrench 6 rotates clockwise, ...

AI Technical Summary

Problems solved by technology

[0007] However, in actual use, the engagement state between the ratchet 5 and the pawl 4 will be hindered by oil, and if the degree of engagement between the ratchet 5 and the pawl 4 is not good, it is easy to cause the pawl 4 (or ratchet 5) the shortcoming of broken tooth, causes whole box wrench 6 to be scrapped, more serious also may influence the safety of user

[0008] like Figure 5 , we assume that there are three dirts that occur between the pawl 4 and the ratchet 5, which are divided into the upper position Z1, the middle position Z2 and the lower position Z3, and the pawl 4 is pushed by the pin 2 to the upper position Z1, so when When there is dirt in the middle position Z2 or the lower position Z3 between the ratchet 4 and the ratchet 5, it will form an obstacle when the ratchet 4 is engaged with the ratchet 5, resulting in Image 6 state, the pawl 4 is tilted and cannot be fully engaged with the ratchet 5

[0009] When the ratchet 4 is tilted and fails to fully mesh with the ratchet 5, the biggest problem is that the user cannot withstand the operation of turning the wrench 6 clockwise in an instant, because the teeth of the ratchet 5 are not completely aligned with the teeth of the ratchet 4. meshing, so the teeth of the ratchet 4 are only in partial contact with the teeth of the ratchet 5, and the area to bear the force is smaller than that of all teeth meshing, so it will lead to stress concentration and the defect of ratchet 5 or ratchet 4 tooth collapse, resulting in the entire branch Socket wrench 6 is scrapped, and more seriously, it may affect the safety of users

[0010] In addition to the above-mentioned problem of oil pollution, it is difficult to control the verticality or parallelism of the various holes, grooves and other spaces processed inside the wrench 6 within an extremely precise tolerance, because precision machining is likely to lead to the problem of high cost, and It will seriously affect the speed of wrench production, resulting in a significant reduction in production capacity

Therefore, when the verticality or parallelism between the internal holes and grooves of the wrench 6 itself is within the general tolerance range, the same problem will still occur, that is, the teeth of the pawl 4 and the teeth of the ratchet 5 are not well meshed or However, there will still be incomplete meshing. When such a defect occurs, it will eventually cause stress concentration and chipping, resulting in the scrapping of the entire socket wrench 6, and even more seriously, it may affect the safety of users.

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