Electrically encoded, electrically controlled push-button combination lock
First Claim
1. Electrically encoded, electrically controlled push-button conbination lock comprisingelectromagnetically controlled locking means (4,14) normally in locked condition;
- a plurality of push-button switches (7, DA, CB, CA, CB, RAB);
an encoding circuit (13) connected to the push-button switches providing an output permitting unlocking of the locking means if, and only if, the sequence of operation of the plurality of push-button switches conforms to a code contained in the encoding circuitcomprising, in accordance with the invention,a memory (A, B) connected to said push-button switches and storing, in binary form, the sequence of operation of the respective push-button switches in the form of a binary code word;
a comparison or decision stage (N7, D7) connected to said memory (A, B) and havingfirst input means (AA = 1;
AB =
1) connected to the memory at the memory positions of all digits of the code associated with the specific lock of one binary digital value (1);
second input means (AA ;
0;
AB =
0) connected to the memory at the memory positions of all digits associated with the specific lock of the code word of the other binary digital value (0);
and third input means connected to the memory at a memory position, the value of which is unaffected by operation of the push-button switches if the push-button switches are operated in accordance with the code associated with said lock;
and means (I2, T2, M) connected to control the locking means (4,
14) in accordance with the decision of the decision and comparison means(a) if the code entered by operation of the push-button switches into the memory conforms to the code associated with the specific lock, as determined by the connections between said first, second and third input means and the memory, to control the locking means to permit unlocking thereof;
or(b) if the code entered by operation of the push-button switches into the memory does not conform to the code associated with the specific lock, as determined by the connection between said first, second and third input means and the memory, to control the locking means (4,
14) to remain in disabled or de-energized condition and hence inhibit unlocking operation of the lock.
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Accused Products
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.
15 Citations
13 Claims
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1. Electrically encoded, electrically controlled push-button conbination lock comprising
electromagnetically controlled locking means (4,14) normally in locked condition; -
a plurality of push-button switches (7, DA, CB, CA, CB, RAB); an encoding circuit (13) connected to the push-button switches providing an output permitting unlocking of the locking means if, and only if, the sequence of operation of the plurality of push-button switches conforms to a code contained in the encoding circuit comprising, in accordance with the invention, a memory (A, B) connected to said push-button switches and storing, in binary form, the sequence of operation of the respective push-button switches in the form of a binary code word; a comparison or decision stage (N7, D7) connected to said memory (A, B) and having first input means (AA = 1;
AB =
1) connected to the memory at the memory positions of all digits of the code associated with the specific lock of one binary digital value (1);second input means (AA ;
0;
AB =
0) connected to the memory at the memory positions of all digits associated with the specific lock of the code word of the other binary digital value (0);and third input means connected to the memory at a memory position, the value of which is unaffected by operation of the push-button switches if the push-button switches are operated in accordance with the code associated with said lock; and means (I2, T2, M) connected to control the locking means (4,
14) in accordance with the decision of the decision and comparison means(a) if the code entered by operation of the push-button switches into the memory conforms to the code associated with the specific lock, as determined by the connections between said first, second and third input means and the memory, to control the locking means to permit unlocking thereof;
or(b) if the code entered by operation of the push-button switches into the memory does not conform to the code associated with the specific lock, as determined by the connection between said first, second and third input means and the memory, to control the locking means (4,
14) to remain in disabled or de-energized condition and hence inhibit unlocking operation of the lock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification