Emergency exit door latch

Details Emergency exit door latch Emergency exit door latch

E - Fixed Constructions

05

C

292/1, 292/2

E05C 15/02 (1980.01)

Patent

CA 1155471

EMERGENCY EXIT DOOR LATCH WITH HYDRAULIC RETARDATION OF BOLT RETRACTION Abstract of the Invention An emergency exit door latch includes a pivoted bolt which pivots into registration with a keeper and is urged in the projected position by a spring biased plunger. The spring biased plunger is retained within a hydraulic cylinder. Hydraulic lines connect the portion of the hydraulic cylinder in front of the plunger to the portion behind the plunger through a throttling bolt urges the plunger rearwardly so as to force fluid in the rear portion of the hydraulic cylinder through the line and the throttling means to the front portion of the hydraulic cylinder thereby allowing the bolt to slowly retract as the fluid is throttled. Preferably, there is an emergency release system which allows rapid transfer of fluid from the rear of the piston to the front of the piston upon the occurrence of an emergency condition such as tripping of a fire alarm or smoke alarm. This emergency system allows the hydraulic fluid to bypass the throttling device which generally retards retraction of the bolt. An alarm system is connected to the latch and sounds whenever the latch is operated so as to alert personnel within the building that someone is trying to open the emergency door without authorization.

417605

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