Patent ID: 8475076

Claim:
A socket wrench comprising an operating handle, a drive attached to said operating handle and having a supporting hole, a steel ball pressed by a spring and movably engaged in said supporting hole, a wrench body having an assembling hole for allowing said drive to engage therein, a recess part for allowing said steel ball to partly engage therein being formed in said assembling hole of said wrench body, a connecting hole engageable with a polygonal head part of a bolt to be operated being formed in said wrench body in such a manner as to be coaxial with said drive, said recess part having a pair of contacting walls for allowing said steel ball to contact therewith, said pair of contacting walls being disposed in mutually intersecting directions, one of said pair of contacting walls being formed with a curved surface of a large arc on a side of said recess part more distant from said operating handle, the other of said pair of contacting walls being formed with a curved surface of a small arc on a side of said recess part nearer said operating handle, and an opening end of said recess part being formed in one plane and having an elliptical shape in a direction intersecting with an axis of said wrench body.