Electrically encoded, electrically controlled push-button combin

Details Electrically encoded, electrically controlled push-button combin Electrically encoded, electrically controlled push-button combin

1977-12-27

1979-04-10

Miller, J D

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

70278, 340147MD, 340164R, E05B 4900

Patent

active

041492129

ABSTRACT:
An encoding circuit is provided permitting energization of an electromagnetic unlocking solenoid if a series of push-button switches is operated in accordance with a predetermined code. The circuit includes a memory which stores the sequence of operation of the push-buttons in accordance with the code in form of a binary code word. A comparison or decision stage is connected to the memory, typically a shift register, and connected to the memory position of all the digits of the code associated with the specific lock of a binary 1 value, as well as all the digits of the code in a binary 0 value, the decision circuit controlling the unlocking solenoid only if both the binary 1 and binary 0 values stored in the memory upon sequential push-button operation conform to the code associated with the lock, and, simultaneously, a timing circuit energized upon initiation of the first properly coded push-button still provides a timing energization signal, or operating energy to the circuit. In addition, the decision stage includes another input connected to a memory position, the value of which is unaffected by operation of the push-button switches so that additional safety against opening of the lock by trial-and-error operation of the push-buttons is provided.

REFERENCES:
patent: 3633167 (1972-01-01), Hedin
patent: 3751718 (1973-08-01), Hanchett
patent: 3766522 (1973-10-01), Marsh
patent: 4050063 (1977-09-01), Schull
Platteter, Dale; "Digital Combination Lock is Virtually Crackproof", Nov. 11, 1976; Electronics, pp. 100-101.

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