Patent ID: 6515243
Filing Date: 2003-02-04
Classification: B60Q

Abstract:
A turn signal switch comprising:a cancellation cam which is moved in accordance with a rotation of a steering shaft and includes a plurality of projections formed on a peripheral surface thereof; an operating member which is rotated from a central neutral position to a right-operated position and a left-operated position, and is held in the neutral position, the right-operated position and the left-operated position with a predetermined position-holding force; a turn lever for rotating the operating member; a cam member which is movable between an interference position where the cam member projects into a path of revolution of the plurality of projections and a stand-by position disposed outside of the path of revolution, wherein the cam member is disposed in the stand-by position when the operating member is in the neutral position, and is disposed in the interference position when the operating member is in one of the right-operated position and the left-operated position; a ratchet member which does not displace the operating member when one of the plurality of projections is rotated in a same direction as a direction indicated by the turn lever and interferes with the cam member disposed in the interference position, and displaces the operation member when one of the plurality of projections rotates in a direction opposite to the direction indicated by the turn lever and interferes with the cam member disposed in the interference position; and a self-cancellation prohibiting mechanism prohibits a movement of the operating member to the neutral position only in a case that the cam member interferes with one of the plurality of projection which is disposed, with respect to the cam member, in the same direction as the direction indicated by the turn lever when the cam member is rotated in the direction opposite to the direction indicated by the turn lever and is in the interference position in a neutral condition of the steering shaft.