Timing apparatus for delaying opening of doors

Details Timing apparatus for delaying opening of doors Timing apparatus for delaying opening of doors

E - Fixed Constructions

05

B

292/2

E05B 65/10 (2006.01) E05B 43/00 (2006.01) E05B 51/02 (2006.01)

Patent

CA 1152125

TIMING APPARATUS FOR DELAYING OPENING OF DOORS Abstract of the Disclosure Opening of a door, such as an emergency exit door, is delayed by encumbering a security device, such as for example a latch bolt, with the task of throttling a hydraulic fluid through a circuit, which circuit includes a normally open valve held closed by a solenoid. When the solenoid is de-energized, the circuit is opened allowing the security device to move so that the door can be opened. The solenoid is controlled by an electrical timing circuit which delays de-energization of the solenoid. The timing circuit is started by a switch mounted to be operated by movement of the latch bolt. Preferably in a situation where there are a plurality of doors, doors proximate to one another are delayed by the same electronic timing circuit. In a preferred embodiment, the electonic timing circuit is set to de-energize the solenoid at a time subsequent to the delay resulting from throttling the fluid.

357647

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