| 摘要 |
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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