Patent ID: 8210609

Claim:
A damper comprising: a vessel; a partitioning member which partitions an interior of said vessel into two accommodation chambers for accommodating a viscous fluid, and which rotates together with said vessel about an axis of said vessel and is movable in an axial direction of said vessel; moving force imparting means for imparting to said partitioning member a moving force in one axial direction by an input of relative rotation about the axis of said vessel with respect to said vessel, so that a moving velocity of said partitioning member to which the moving force is imparted is set to one corresponding to a rotating velocity of the input of rotation; first resilient means for resiliently urging said partitioning member in another axial direction; a through hole formed in said partitioning member so as to allow the two accommodation chambers inside said vessel to communicate with each other; an allowing/limiting member which is resiliently urged in the one axial direction to allow the viscous fluid accommodated in said two accommodation chambers in said vessel to flow reciprocally between said two accommodation chambers through said through hole, and which limits the flow of the viscous fluid in said accommodation chamber in the one axial direction into said accommodation chamber in the other axial direction through said through hole against the resilient urge in the one axial direction allowing that flow, when the internal pressure of the viscous fluid accommodated in said accommodation chamber in the one axial direction is generated in excess of a fixed value on a basis of the movement of said partitioning member in the one axial direction, said allowing/limiting member having a lid portion which is opposed to an axial one open end of said through hole at an axial other end face of said partitioning member and is disposed movably in the axial direction, and at least a pair of mutually spaced-apart projections formed integrally on said lid portion projectingly in the other axial direction and fitted in said through hole movably in the axial direction, and second resilient means for urging said lid portion in the one axial direction.