Patent ID: 7621200

Claim:
A steering wheel adapter that is interposed between a steering wheel and a boss of a vehicle and that enables attachment and detachment of the steering wheel to and from the boss, the steering wheel adapter comprising: a base having an opening, the boss being attached to a face of the base opposite the opening; a ring that covers an outer side face of the base and that is capable of sliding and rotating along the outer side face; a guide hole penetrating the side face of the base from outside to the inside of the opening; a cam face formed on an inner circumferential face of the ring so as to face the guide hole; a locking member that is installed in the guide hole and that is capable of protruding into the opening by a press-out force generated by the cam face in accordance with slide and rotation of the ring; a plate, to one end of which the steering wheel is attached; a plug that is formed on a face opposite to the one face of the plate and inserted into the opening of the base, and an outer side face of which is pressed to contact the locking member protruding into the opening; and a press-out assisting member that is interposed between the cam face and the locking member so as to be capable of moving to protrude and withdraw from the outer side face of the base along a penetration direction of the guide hole, and that conveys the press-out force generated by the cam face to the locking member, wherein the press-out assisting member is a roller rotating on the cam face in accordance with slide and rotation of the ring.