Patent ID: 7357230

Claim:
A damper comprising: a pair of members disposed in such a manner as to be rotatable relative to one another about an axis, and silicone-based unvulcanized rubber interposed between said pair of members, said silicone-based unvulcanized rubber being in contact with each surface of said pair of members, said silicone-based unvulcanized rubber being plastically deformed when said pair of members are rotated relative to one another about said axis, and having a degree of plasticity of not less than 30 mm/100 and not more than 420 mm/100, as measured with a William plastometer, one of said pair of members including a housing which has a housing body including a hollow cylindrical member and a closure portion that closes one end face of said hollow cylindrical member and has a central recessed portion in an inner surface thereof, another one of said pair of members including a gap forming member accommodated relatively rotatably in said housing body for forming a gap in association with an inner surface of said housing body, and a cover member secured to said gap forming member, said gap forming member having a central projection fitted in said central recessed portion in such a manner as to be rotatable relative to said closure portion about the axis, and a hole in which serrations extending along the axial direction are formed on the gap forming member, said hole of said gap forming member being adapted to receive a serrated tip portion of a shaft, said silicone-based unvulcanized rubber being disposed in said gap.