Alarm type lock assembly

Details Alarm type lock assembly Alarm type lock assembly

1977-12-22

1980-06-03

Wolfe, Robert L.

Locks

Parts, attachments, accessories and adjuncts

Condition indicators

70441, 70DIG49, E05B 3900

Patent

active

042055423

ABSTRACT:
Alarm type lock assembly comprising a cylinder having a core rotatably disposed therein, a key slot extending through the core, a plurality of bores extending into the key slot, tumblers disposed in the bores and spring biased to a first position in which the tumblers prevent rotative movement of the core, a key adapted to enter the slot and operative to move the tumblers to a second position to permit rotative movement of the core, and contact points aligned with the tumblers and in circuit with an alarm means, the tumblers being movable to a third position in which the tumblers engage the contact points to energize the alarm means and prevent opening operation of the lock.

REFERENCES:
patent: 2057301 (1936-10-01), Golokow
patent: 2095819 (1937-10-01), Lefebvre
patent: 3724245 (1973-04-01), Kitchen
patent: 3878700 (1975-04-01), Lopez
patent: 3986376 (1976-10-01), Lack

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