NOTAUSGANGSTUERFALLE MIT RIEGELRUECKZUGSVERZOEGERUNG.

摘要

An emergency exit door latch system including a pivoted bolt (13) which pivots into registration with a keeper (14) and is urged into a projected position by a plunger (30) biassed by a spring (31). The plunger is retained within a hydraulic cylinder (27). Hydraulic lines (42, 44, 41) connect the portion of the cylinder in front of the plunger through a throttling means (45). On pressing against the door (10) the bolt (13) urges the plunger rearwardly to force hydraulic fluid to the rear of the plunger via the throttling means (45) thus allowing slow bolt retraction. A push bar locks the bolt in the projected position. A solenoid blocking valve (43) can be used to lock the bolt (13). A solenoid operated valve (73) allows rapid opening of the bolt in an emergency. The valve operation is responsive to alarm or emergency condition. An alarm arrangement (53) gives warning that someone trying to open the door (10).