Locks – Operating mechanism – Predetermined time interval controlled
Patent
1990-07-18
1991-02-12
Wolfe, Robert L.
Locks
Operating mechanism
Predetermined time interval controlled
70271, E05B 4300
Patent
active
049914154
ABSTRACT:
A lock includes a hollow lock body with a plurality of aligned first transverse holes, a cylindrical key plug rotatably disposed inside the lock body and having a plurality of second transverse holes aligned with the first transverse holes, and a plurality of tumbler pins extending into each set of aligned first and second transverse holes. The lock further includes a first control switch actuated by inserting a key into the key plug, a second control switch actuated by rotating the key plug relative to the lock body, and an electrical control circuitry including a first timer circuit connected to the second control switch, a second timer circuit connected to the first control switch, a warning device and an electromagnetic control unit both actuated by the second timer circuit. The first timer circuit disables the second timer circuit for a predetermined time period when the first timer circuit is actuated. The warning device sends out alarm signals and the electromagnetic control unit prevents the rotation of the key plug for a predetermined period of time if the lock has not been opened after the second timer circuit has counted down a preset time period.
REFERENCES:
patent: 2318908 (1943-05-01), Welch
patent: 3587081 (1971-06-01), Hawkins
patent: 3608342 (1971-09-01), Katz
patent: 3670538 (1972-06-01), Curry
patent: 4734695 (1988-03-01), Dluhoseh
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