Patent ID: 7077033

Claim:
A socket wrench which is combined with an anvil of a motive tool: wherein the socket wrench has a pin insertion hole which receives a combining pin; wherein the combining pin is fixedly maintained by a ring which surrounds a circumference of the socket wrench; wherein one end of the pin insertion hole is closed as a blind hole; wherein the anvil of the motive tool is fixed into a square hole of the socket wrench by the combining pin; wherein the combining pin is inserted into the pin insertion hole; wherein a center of gravity for the combining pin is arranged to be established between a closing portion of the blind hole and a center line of the socket wrench; wherein a projection portion is formed on the ring and extends into a space of the pin insertion hole; wherein the space is between the ring and an end of the pin which is opposite to the closing portion of the blind hole; wherein length of the projection portion prevents the pin from freely moving in the space; wherein the ring maintains a position of the pin; wherein centrifugal force caused by rotation of the socket wrench is imposed toward a direction of the closing portion of the blind hole because the center of gravity of the combining pin is to the closing side of the pin from the center line of the socket wrench; and wherein the pin is prevented from moving towards the end of the pin which is opposite to the closing portion of the blind hole during the rotation of the socket wrench.