Patent ID: 8657085

Claim:
An air damper, comprising: a cylinder member having a cylindrical shape and a bottom plate; a piston member movably provided inside the cylinder member, and forming an air chamber between the piston member and the bottom plate of the cylinder member, the piston member having an orifice portion communicating the air chamber and an outside, and an air passage in a center thereof; a seal member disposed in a concave portion formed in an outer periphery of the piston member, and sealing the piston member and an inner peripheral surface of the cylinder member; a rod member passing through the air passage formed in the piston member; a push-in portion provided in the rod member, the push-in portion hitting against the piston member when the rod member is pushed in toward the bottom plate of the cylinder member, to thereby move the piston member toward the bottom plate of the cylinder member; and a suction member provided in an end portion of the rod member, the suction member closing the air passage by hitting against the piston member when the rod member is pulled out of the cylinder member, and opening the air passage by moving away from the piston member when the push-in portion moves the piston member toward the bottom plate of the cylinder member by pushing the rod member into the cylinder member, wherein the orifice portion is formed between an outer peripheral surface of the piston member and an inner peripheral surface of the seal member.