Patent ID: 8528708
Filing Date: 2013-09-10
Classification: F16F,Y10T

Abstract:
1. An air damper comprising: a tubular cylinder in which both end portions are opened; a piston which moves within the cylinder; and a cap which closes a one-end opening of the cylinder, wherein the cylinder has an annular seal surface formed on a circumferential surface of the one-end opening, wherein the cap is mounted on the one-end opening side of the cylinder so as to be moveable or deformable along an axial direction of the cylinder, wherein the cap is brought into contact with or separated from the seal surface in accordance with a pressure change due to a movement of the piston within the cylinder, wherein a first orifice is opened in a base plate of the cap, wherein an abutment portion which is smaller than a diameter of the seal surface but is larger than a diameter of the first orifice exists between the cap and the cylinder, and wherein a second orifice having an inlet area smaller than the first orifice is defined between the cap and the cylinder when the cap is brought into contact with the cylinder at the abutment portion during an operation of the first orifice.