Patent ID: 8336685
Filing Date: 2012-12-25
Classification: E05F,E05Y,F16F

Abstract:
1. A damper, comprising: a housing; a hollow outer rotor provided inside said housing; an inner rotor disposed inside said outer rotor, constituting a plurality of liquid chambers wherein viscous fluid is filled between the outer rotor and the inner rotor, and rotating in a state decentered relative to an axial core of the outer rotor; a communicating passage connecting between said liquid chambers; and a valve mechanism moving inside said communicating passage, said valve mechanism including a piston in an approximately cup shape having an orifice at a bottom thereof, said piston being slidably arranged inside the communicating passage and forming a sealing surface except for the orifice, and an urging device arranged inside the piston and urging said piston in a direction opening said communicating passage, wherein when a pressure inside the communicating passage reaches a predetermined value or above due to rotation of said inner rotor, the communicating passage is closed or a flow passage area of the communicating passage is narrowed by the piston, and when the pressure inside the communicating passage falls to the predetermined value or less, the communicating passage is opened.