Multiple code electronic combination door lock
First Claim
1. An electronic combination lock for a door separating a non-secure and secure area comprising:
- a plurality of operator actuable signal switches for generating signals corresponding to a selected code, each signal switch bearing different indicia;
sequence detector means, having a plurality of stages equal to the number of digits in the code, for providing a signal only if each stage receives a signal in proper sequential order;
a first selector means for selecting a first code and transmitting a signal from each of the signal switches selected to be within the first code to the sequence detector means;
a second selector means for selecting a second code and transmitting a signal from each of the signal switches selected to be within the second code to the sequence detector means;
a third code circuit means for transmitting a signal from each of the signal switches set within the third code to the sequence detector;
means for selectively activating either the first selector means, the second selector means, or the third code circuit means to be responsive to the generation of signals by the signal switches selected within each respective code; and
an electrically actuated control means connected to the output of the sequence detector means for allowing the door to open in response to signal from the sequence detector.
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Accused Products
Abstract
The electronic combination door lock has three codes, each of which if properly actuated will allow the door to open. Signal switches are connected in parallel with two sets of resettable multiposition switches. The multiposition switches enable setting the first and second codes and transmit the signals generated by the signal switches selected to a logic circuit or sequence detector that detects the sequence of the signals. If the sequence is correct, the sequence detector provides an output to solenoid circuitry to release the lock. A third code circuit is in parallel with the first and second codes and also provides a connection from selected signal switches to the sequence detector. An error detecting circuit counts all actuations of the signal switches and resets the sequence detector if the generated signals exceed the number of digits in the code. Mechanical locks and covers are used in combination with the electronic codes to prevent access to the signal switches and to the resettable parts of the multiposition switches. The mechanical locks also selectively activate the first, second or third code circuitry.
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Citations
17 Claims
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1. An electronic combination lock for a door separating a non-secure and secure area comprising:
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a plurality of operator actuable signal switches for generating signals corresponding to a selected code, each signal switch bearing different indicia; sequence detector means, having a plurality of stages equal to the number of digits in the code, for providing a signal only if each stage receives a signal in proper sequential order; a first selector means for selecting a first code and transmitting a signal from each of the signal switches selected to be within the first code to the sequence detector means; a second selector means for selecting a second code and transmitting a signal from each of the signal switches selected to be within the second code to the sequence detector means; a third code circuit means for transmitting a signal from each of the signal switches set within the third code to the sequence detector; means for selectively activating either the first selector means, the second selector means, or the third code circuit means to be responsive to the generation of signals by the signal switches selected within each respective code; and an electrically actuated control means connected to the output of the sequence detector means for allowing the door to open in response to signal from the sequence detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A multiple code electronic combination door lock comprising:
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a plurality of operator actuable signal switches for generating signals corresponding to a selected code, each signal switch bearing different indicia; a first cover mounted over the signal switches; sequence detector means having a stage for each digit in the code for providing an output if each stage receives a signal in sequential order; a first selector means for manually selecting a first code, and for transmitting signals from the selected signal switches to the sequence detector means; a second cover mounted over the first selector means; a second selector means for manually selecting a second code, and for transmitting signals from the selected signal switches to the sequence detector means; a third cover mounted over the second selector means; a third code circuit means for transmitting signals from the signal switches set within the third code to the sequence detector means; means for selectively activating the first selection means, the second selection means, or the third code circuit means; error detecting means for counting each signal switch activation and for providing a reset output to reset the sequence detector means upon counting a number in excess of the number of digits in the code; lock-up means for counting each reset output generated from the error detecting means, and for rendering the electronic combination lock inoperative should the number of reset outputs generated reach a pre-selected number; and electrically actuated control means connected to the output of the sequence detector means for allowing the door to open in response to a signal from the sequence detector. - View Dependent Claims (17)
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Specification