Patent ID: 8464614
Filing Date: 2013-06-18
Classification: B25B

Abstract:
1. A ratchet wrench handle comprising a rotation member provided at a handle head located at a distal end of an operation handle, said rotation member being provided with a portion for connecting an adaptor and being provided with ratchet teeth continuously formed on a periphery of said rotation member; either one side chosen between one or more positive rotation-aimed operation claws and one or more reverse rotation-aimed operation claws can be engaged with said ratchet teeth through operating a switch member so that said adaptor is rotated in a positive or reverse rotational direction; an operation piece is swingably supported by an axis in said handle head; said one or more positive rotation-aimed operation claws being disposed on one portion of a distal end surface of said operation piece that faces said rotation member, and said one or more reverse rotation-aimed operation claws are disposed on the oppositely located other portion of said distal end surface; said operation piece being provided, at a middle portion of its backward end surface that is located oppositely to a middle portion between said positive and reverse rotation-aimed operation claws on said distal end surface, with a cam edge recessed in the direction of said distal end surface; a pressing pin provided in said switch member in such a manner that said pressing pin can freely move into and out of said switch member; a distal end of said pressing pin pressurely contacts with said cam edge by way of a biasing force of a spring; said switch member being located on a line extended from an imaginary straight line running between the rotation axis of said rotation member and the aforesaid axis; a set of plural positive rotation-aimed operation claws and a set of plural reverse rotation-aimed operation claws being provided symmetrically on a distal end surface of the operation piece in such a manner that each set of the positive and reverse rotation-aimed operation claws is positioned such as to be concentric with said ratchet teeth when engaging with said ratchet teeth; and said operation piece being provided, on each of the two lateral sides thereof, with a contact edge which is, when said operation piece receives a load from said ratchet teeth, to pressurely contact with one of pressure receiving edges provided on an inner edge of an accommodation chamber that accommodate said operation piece.