Patent ID: 8813899

Claim:
A damper for damping an external force, comprising: a vessel having a cylindrical chamber therein; a slider member placed in the chamber, dividing the chamber into a first room and a second room, having a hole connecting between the first room and the second room, and being movable toward both the first room and the second room in the cylindrical chamber; a turn member placed in the first room, being turned by the external force, and converting a predetermined direction turning force into a driving force of the slider member; a viscous fluid filled in the chamber; an elastic partition member engaged with the slider member to open and close the hole by a pressure difference of the viscous fluid between the first room and the second room, having a communication path between the first room and the second room, opening the hole to pour the viscous fluid from the first room to the second room through the hole upon moving of the slider member toward the first room, closing the hole to generate a first throttle resistance or a second throttle resistance larger than the first throttle resistance for limiting a flow of the viscous fluid from the second room to the first room through the communication path upon moving of the slider member toward the second room, and deforming due to a limitation of the flow of the viscous fluid from the second room to the first room while closing the hole; a coiled spring that energizes the slider member toward the turn member; and a cap fixed to the vessel by engaging with the slider member and blocking an opening at one end of the vessel, wherein, when the turn member is turned at a turning rate less than a predetermined turning rate and the elastic partition member closes the hole, the slider member moves at a lower moving rate than a predetermined moving rate toward the second room with damping of the turn of the turn member by the first throttle resistance, and when the turn member is turned at a turning rate more than the predetermined turning rate and the elastic partition member closes the hole, a minimum flow passage area of the communication path decreases due to deformation of the elastic partition member, the move of the slider member toward the second room is prevented, and the slider member is rigid-coupled with the turning member to turn together with the turning member by the second throttle resistance larger than the first throttle resistance.