Retained key double cylinder deadbolt

Details Retained key double cylinder deadbolt Retained key double cylinder deadbolt

1980-04-11

1982-02-16

Wolfe, Robert L.

Locks

Operating mechanism

Key

70389, 70DIG60, E05B 910, E05B 1704

Patent

active

043154204

ABSTRACT:
A double cylinder lock bolt has a key for the inside lock cylinder which is retained by a latch operable from the outside locking cylinder. Three alternative means for preventing operation of the inside cylinder by the outside key are disclosed. The arrangement makes a double cylinder deadbolt more suitable for use in fire or panic situation without sacrificing security.

REFERENCES:
patent: 4028917 (1977-06-01), Schlage
patent: 4068510 (1978-01-01), Neary
patent: 4109496 (1978-08-01), Allemann

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