Latch-operating mechanism for a panic egress device

Details Latch-operating mechanism for a panic egress device Latch-operating mechanism for a panic egress device

1989-08-17

1990-12-18

Nicholson, Eric K.

Closure fasteners

Bolts

Multiple

292 92, 292DIG62, 292DIG65, E05B 6510

Patent

active

049781510

ABSTRACT:
The mechanism is configured to operate both a primary latch bolt and secondary latches, and provides for immediate, ready egress for the side of a door to which the mechanism is mounted, but offers high security for the other, outside of the door. The latch bolt is directly controlled by a first linkage, and the secondary latches are directly controlled by a second linkage. During egress, both linkages translate together, via a pin connection. However, a lost motion arrangement prevents retraction of either the bolt, or the secondary latches, if the other is compromised (or operated by a key or combination). From the outside, high security side of the door, the latch bolt and the secondary latches must be retracted together.

REFERENCES:
patent: 981843 (1911-01-01), Davis
patent: 2594253 (1952-04-01), Vander Veer
patent: 3345099 (1967-10-01), Paul et al.
patent: 3730574 (1973-05-01), Zawadzki
patent: 3819213 (1974-06-01), Vanderburgn
patent: 4601499 (1986-07-01), Kim
patent: 4741563 (1988-05-01), Conrs

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