AIR DAMPER WITH ADJUSTABLE AIR FLOW RATE.

摘要

The air damper (10) includes a housing (12) with cylindrical walls (20) and a piston assembly (14) reciprocating therein. The piston assembly includes an interior surface against which a seal (76) abuts. The interior surface (41) is textured in a grained pattern so that interstices are formed between the seal and the interior surface thereby forming an effective air passageway for damping. A cylindrical spacer (42) spaces the interior surface from a retainer and the seal is engaged around the cylindrical spacer and between the retainer and the interior surface. An alternative embodiment inserts textile material (100) through a damping orifice in order to vary the rate of damping.