Patent ID: 6523658
Filing Date: 2003-02-25
Classification: B25B,F16D

Abstract:
A clutch mechanism for use in a rotary tool having screw-driving and drill modes, the clutch mechanism comprising:an epicyclic reduction gear mechanism including an internal gear rotatably held within a housing; a plurality of axial cam protrusions provided on an axial end surface of the internal gear, each cam protrusion having at least one guide slope surface; a plurality of axially movable press members; biasing means for pressing the press members against the axial end surface of the internal gear so as to secure the cam protrusions by causing the press members to interfere with the guide slope surfaces of the cam protrusions; and means for selectively regulating the axial movement of the press members away from the axial end surface, wherein each press member comprises an axial body which is disposed orthogonally to the axial end surface of the internal gear and which includes at least one slope surface, the slope surface being slidable on the guide slope surfaces due to revolution of the cam protrusions so as to move the axial body away from the axial end surface of the internal gear.