Patent ID: 8869957

Claim:
A damper comprising: a vessel for accommodating a viscous fluid in its interior; at least one hampering wall provided in the interior of said vessel to hamper a flow of the viscous fluid in a first rotating direction about an axis of said vessel, said first rotating direction having a clockwise rotating direction and a counterclockwise rotating direction opposite to the clockwise rotating direction; a partitioning member for partitioning the interior of said vessel accommodating the viscous fluid into at least first and second chambers in the first rotating direction, said partitioning member being provided in the interior of said vessel rotatably in the first rotating direction with respect to said vessel; at least one communicating hole formed in said partitioning member so as to allow the first and second chambers in the interior of said vessel to communicate with each other via a variable passage whose passage cross-sectional area changes; and flow limiting means for limiting the flow of the viscous fluid from the first chamber into the second chamber through said communicating hole when an internal pressure of the viscous fluid accommodated in the first chamber has exceeded a fixed value on a basis of a rotation of said partitioning member in the clockwise rotating direction with respect to said vessel, wherein said flow limiting means includes: a variable passage forming member which has a through hole which, in a first end face of said variable passage forming member in the clockwise rotating direction, is open to the first chamber, said variable passage forming member being fitted to said partitioning member movably in such a manner as to oppose, at a second face of said variable passage forming member in the counterclockwise rotating direction, a side face of said partitioning member in the clockwise rotating direction, so as to form the variable passage communicating with the through hole and said communicating hole in cooperation with the side face; and an annular elastic member surrounding the variable passage and disposed between the second end face and the side face in the first rotating direction, so as to brake the relative rotation of said partitioning member to said vessel in the first rotating direction.