Trapped key lock mechanism

Details Trapped key lock mechanism Trapped key lock mechanism

1990-08-09

1992-01-14

Gall, Lloyd A.

Locks

Special application

For closures

70162, 70232, 70389, 70454, 70DIG57, 292251, 411407, E05B 1102

Patent

active

050799355

ABSTRACT:
A lock operable by a key between a locked condition and an open condition, the lock having a fastener for releasably securing the lock to an object, the fastener being movable between a retracted position wherein the lock is in the open condition and an extended position, a spring for biasing the fastener to the retracted position and an enclosure having an opening adapted to allow the insertion and removal of the key from the lock when the lock is in the locked condition and to prevent the removal of the key from the lock when the lock is in an unlocked condition.

REFERENCES:
patent: 188112 (1877-03-01), Ekerman
patent: 780951 (1905-01-01), Kulhanek
patent: 1480338 (1924-01-01), Bacon
patent: 1784551 (1930-12-01), Smith
patent: 1788118 (1931-01-01), Meyer
patent: 3222899 (1965-12-01), Bodoh et al.
patent: 3299678 (1967-01-01), Spencer
patent: 3444712 (1969-05-01), Greenwald
patent: 3494159 (1970-02-01), Greenwald
patent: 3798935 (1974-03-01), Blekking et al.
patent: 3855824 (1974-12-01), Falk
patent: 4073165 (1978-02-01), Grundstrom et al.
patent: 4147905 (1979-04-01), Scherbing
patent: 4337987 (1982-07-01), Brooks et al.
patent: 4686874 (1987-08-01), McCauley et al.

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