| 摘要 |
An air damper includes: a piston adapted to reciprocate in a cylinder; an annular recessed portion formed along an outer periphery of the piston; a sealing member fitted in the recessed portion in a slidable manner, adapted to slidingly contact an inner peripheral surface of the cylinder, and forming air chambers on both sides of the piston, respectively, together with the piston; a communicating device allowing the air chambers formed on both sides of the piston to communicate with each other or not to communicate with each other depending on a stopping position of the sealing member; and a reduced-diameter portion formed by reducing a diameter of the cylinder on one end side thereof so as to gradually increase a frictional force between an inner periphery of the reduced-diameter portion and the sealing member.
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