Patent ID: 7490535

Claim:
A socket wrench comprising: a cylindrical case with an open end and a support wall with a rotation guide pass hole, a diameter of which is smaller than that of the said open end; a cap detachably connected to the open end of said cylindrical case, said cap having a rotation guide pass hole in its center; initial input axis inserted to permit movement back and forth in the rotation guide pass hole of the cap, said initial input axis having a first end and a second end, said first end of the initial input axis positioned inside of the cylindrical case and having a first flange part with jagged outer surface and said second end of the initial input axis positioned outside of said cap being connected to an operation handle; an operating gear installed inside the cylindrical case, said operating gear having a gear part on its circular outer surface and having a second flange part with jagged outer surface that allows engaging with the jagged outer surface of the said initial input axis; a final rotating axis installed in the rotation guide pass hole of said cylindrical case, said final rotating axis being rotated by torque of the operating gear transmitted through torque increasing means, one end of said final rotating axis protruding out of the rotation guide pass hole and connected to a socket; elastic means installed on the outer surface of the initial input axis between said cap and the first flange part for elastically supporting engagement between the jagged outer surface of the first flange part of the initial input axis and the jagged outer surface of the second flange part of the operating gear; initial input axis movement binding/release means for selectively enabling and disabling the forward and backward movement of the initial input axis while enabling rotation of the initial input axis; wherein the incline angle comprising the jagged outer surfaces of the initial input axis and the operating gear meets a condition in which when tightening nuts or bolts to an object, the operating gears will rotate together with the initial input axis with the jagged outer surfaces engaged due to the elastic force of the elastic means, and when the nuts or bolts are tightened to said object, the jagged outer surfaces disengage, overcoming the elastic force of the elastic means.