Door exit-delaying means

Details Door exit-delaying means Door exit-delaying means

1990-02-23

1991-07-30

Nicholson, Eric K.

Closure fasteners

Bolts

Emergency operating means

29234116, 292DIG65, F05C 1502

Patent

active

050354507

ABSTRACT:
In a first embodiment, the invention has a casing set in the frame of a door in confronting relationship to the latchbolt-confining housing of the door. A bolt, translatable in the casing, is extended, by a solenoid, and enters the housing to prevent opening of the door. A latchbolt position sensor, in the form of a dual-ended limb, monitors the position of the latchbolt. Upon withdrawal of the latchbolt, from latching closure of the door, the limb actuates a switch to operate a time delay circuit component. When the specified time delay set by the component has run its course, it cuts power to the solenoid. Compression springs withdraw the bolt from the latchbolt-confining housing, to permit the door to open.

REFERENCES:
patent: 3765709 (1973-10-01), Van Wyck
patent: 3872696 (1975-03-01), Geringer
patent: 4032180 (1977-06-01), Pohl
patent: 4132439 (1979-01-01), Millar
patent: 4257631 (1981-03-01), Logan, Jr.
patent: 4324425 (1982-04-01), Logan
patent: 4354699 (1982-10-01), Logan
patent: 4529234 (1985-07-01), Senften
patent: 4613176 (1986-09-01), Kelly
patent: 4904005 (1990-02-01), Frolov

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