electric screw driver

Abstract

The invention discloses an electric screw driver, which comprises a handle casing, a handle cap, a motor, a control circuit, a speed reduction torsion changing box, a spindle and a screwdriver bit, wherein the motor, the control circuit, the speed reduction torsion changing box and the spindle are all arranged in the handle casing; the spindle penetrates through the handle cap and is connected with the screwdriver bit; the speed reduction torsion changing box comprises a box body, ejector rods, an ejector ring, a pressing ring, a torsion spring, a torsion base, a torsion adjusting sleeve, a locking sleeve, a locking sleeve spring, an annular gear and planet gear assemblies; two pin rollers arranged on the front end surface of the annular gear are tangent to semicircular concave surfaces arranged on the ejector rods. The electric screw driver is simple in structure, easy to assemble and maintain and highly practical; the torsion can be adjusted freely, and is constant and accurate; the mains supply is directly used for work, so the electric screw driver is suitable for an assembly line and various maintaining and mounting occasions.

Description

technical field [0001] The invention relates to the field of electric tools, in particular to an electric screwdriver which can be used in various working positions, especially in narrow working areas. Background technique [0002] Electric screwdrivers on the market have the disadvantages that it is difficult to control the screw tightening torque and there is no torque adjustment. For this reason, the applicant invented an in-line electric screwdriver that can accurately adjust the output torque within a wide range and applied for an invention patent. The patent numbers are 200720053996.8 and 200820201281.7 respectively, which basically solve the above problems. However, the above two solutions also have defects such as high assembly strength, easy wear, and difficult maintenance. Contents of the invention [0003] The problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art, and provide an electric screwdriver with simpl...

AI Technical Summary

Problems solved by technology

[0002] Electric screwdrivers on the market have the disadvantages that it is difficult to control the screw tightening torque and there is no torque adjustment. For this reason, the applicant invented an in-line electric screwdriver that can accurately adjust the output torque within a wide range and applied for an invention patent. The patent numbers are 200720053996.8 and 200820201281.7 respectively, which basically solve the above problems

However, the above two solutions still have defects such as high assembly strength, easy wear, and difficult maintenance.

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