Patent ID: 7416030

Claim:
A mechanical time delay apparatus for creating a time delay between a pneumatic inlet for connection to a source of pressurized gas and a pneumatic outlet, said time delay apparatus comprising: a primary pneumatic flow path from said inlet to said outlet; a movable gate associated with said primary pneumatic flow path and movable between an open position and a closed position, said gate urged by a biasing force to said closed position; in said closed position, said gate disposed to block a flow of gas through said primary pneumatic flow path, and, in said open position, said gate permitting said flow of gas through said primary flow path; an accumulation chamber in communication with said gate for a gas pressure within said accumulation chamber to urge said gate against said biasing force to said open position when said gas pressure exceeds a threshold pressure; a secondary pneumatic flow path from said inlet to said accumulation chamber; an adjustment mechanism for adjusting an internal volume of said accumulation chamber to thereby adjust an amount of time required for a gas admitted to said accumulation chamber to exceed said threshold pressure; and wherein said internal volume is defined, at least in part, by a movable wall, said adjustment mechanism includes said wall adapted to be moved to one of a plurality of stationary positions to alter said internal volume.