| 摘要 |
A cylinder type air damper includes a cylinder having at least one rib projecting radially inwardly and extending in the axial direction, a piston inserted for reciprocation within the cylinder and axially dividing the interior of the cylinder into a front compartment and a rear compartment. An exhaust hole axially penetrates the piston and is provided with a valve for blocking the exchange of air between the two compartments in response to an axial movement of the piston in one direction. An orifice also axially penetrates the piston within an area thereof subject to blocking by means of the valve for permitting the exchange of air between the two compartments in response to the axial movement of the piston. A vent duct communicates at one end with the orifice and is open at the other end within an area other than the area subject to blocking by means of the valve.
|
