Timing apparatus for delaying opening of doors

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

1980-02-29

1982-05-11

Moore, Richard E.

Closure fasteners

Bolts

Swinging

292DIG65, 292 92, E05C 1502

Patent

active

043289851

ABSTRACT:
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 electronic timing circuit is set to de-energize the solenoid at a time subsequent to the delay resulting from throttling the fluid.

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patent: 3970339 (1976-07-01), Haselton et al.
patent: 4006471 (1977-02-01), Pappas

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