Damper for automobile seat and automobile seat mechanism having the damper

A damper for an automobile seat comprising:

• a fixing member adapted to be fixed to a chassis on which an automobile seat is rotatably installed;
• a rotator which is rotatable relative to said fixing member and forms a gap with said fixing member;
• a silicone-based unvulcanized rubber disposed in the gap;
• and a one-way clutch which, in the rotation of the automobile seat in one direction, is adapted to transmit the rotation in the one direction to said rotator, and which, in the rotation of the automobile seat in another direction, is adapted to inhibit the transmission of the rotation in the other direction to said rotator, said fixing member including a housing member and a cover member which is threadedly secured or fittingly secured to said housing member, said housing member including an outer hollow cylindrical portion, an inner hollow cylindrical portion disposed concentrically with the outer hollow cylindrical portion on an inner side of the outer hollow cylindrical portion, and a closure portion formed integrally on the outer hollow cylindrical portion and the inner hollow cylindrical portion so as to close one axial end portion of the outer hollow cylindrical portion and the inner hollow cylindrical portion, said cover member being threadedly secured or fittingly secured to another axial end portion of the outer hollow cylindrical portion, said rotator including an outer peripheral hollow cylindrical portion disposed concentrically with the outer hollow cylindrical portion on an inner side of the outer hollow cylindrical portion and on an outer side of the inner hollow cylindrical portion, an inner peripheral hollow cylindrical portion connected to the outer peripheral hollow cylindrical portion and disposed concentrically with the outer peripheral hollow cylindrical portion on an inner side of the inner hollow cylindrical portion, and the outer peripheral hollow cylindrical portion and at least one of the outer hollow cylindrical portion and the inner hollow cylindrical portion being overlappingly fitted to each other in the radial direction with the gap in which said silicone-based unvulcanized rubber is disposed, said one-way clutch including a hollow cylindrical body juxtaposed to the inner peripheral hollow cylindrical portion in the axial direction, as well as a coil spring having one end portion formed as a free end and wound around respective outer peripheral surfaces of the inner peripheral hollow cylindrical portion and the hollow cylindrical body.