Electronic security control system

Details Electronic security control system Electronic security control system

1974-07-29

1976-04-27

Miller, J. D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

317151, 340164R, E05B 4900

Patent

active

039537692

ABSTRACT:
Actuation of an electrically operated lock is controlled by an electronic permutation circuit including an array of code entry push-button switches disposed for operation at the entrance to a secured area and a plurality of code selector switches mounted inside the secured area for setting a predetermined code sequence. If the correct code sequence is entered, corresponding to the setting of the code selector switches, an electronic counter is sequentially advanced to a selected terminal state determined by a code length selector switch which is connected to and for operating the electrically controlled lock. The time interval during which the lock is electrically actuated may be selected by a latch time selector switch mounted along with the code selector switches inside the secured area. The occurence of a preselected number of errors during code entry, a number which may be set by a selector switch mounted along with the other selector switches, provides for activating a penalty period during which the entire system is disabled and inoperable. The duration of the penalty time may also be varied by another selector switch. A common counting circuit is employed for the error count, penalty time and latch time modes of the system. For driving a solenoid-type lock or latch, output circuitry is provided in one embodiment to include a transistorized latch driver circuit for developing a surge current for instantaneous, positive opening of the solenoid lock or latch. In another embodiment, a digital clock and display having a 24 hour timing format is provided in combination with an elapsed day counter circuit to permit use of the system as a time lock. Opening of the lock is inhibited until the expiration of a preselected time interval which may be set to a desired number of elapsed days, hours and minutes.

REFERENCES:
patent: 1283845 (1918-11-01), Marchant
patent: 3126490 (1964-03-01), Stern
patent: 3140428 (1964-07-01), Shepard
patent: 3587051 (1971-06-01), Hovey
patent: 3641396 (1972-02-01), Kossen et al.
patent: 3772574 (1973-11-01), Hughes
patent: 3813533 (1974-05-01), Cone et al.
patent: 3825898 (1974-07-01), Miller

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