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Remote-control lock system

  • US 4,686,529 A
  • Filed: 01/06/1984
  • Issued: 08/11/1987
  • Est. Priority Date: 01/06/1984
  • Status: Expired due to Fees
First Claim
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1. A method of operating a remote-control lock system havinga transmitter provided with a main-code generator that can emit any of a set formed of a multiplicity of differently coded main-code signals and with a synchronization-code generator that can emit any of a set formed of a multiplicity of differently coded synchronization signals different from the main code signals,a receiver provided with a main-code decoder that can be set to respond to any of the signals and with a synchronization-code decoder that can be set to respond to any of the synchronization signals,control means for resetting the main-code decoder of the receiver to a predetermined one of the main-code signals on receiving by the synchronization-code decoder of the synchronization signal it is set to, anda lock operable by the receiver when its main-code decoder receives the main-code signal it is set to, the method comprising the steps of:

  • initially setting the main-code generator of the transmitter to emit on normal actuation a predetermined one of the succession of main signals, also initially setting the synchronization-code generator of the transmitter to emit on special actuation of the transmitter a predetermined one of the succession of synchronization signals, and also initially setting the main-code decoder of the receiver to respond to the predetermined one of the main signals and the synchronization-code decoder of the receiver to the predetermined one of the synchronization signals;

    thereafter on normal actuation of the transmitter, after each emission by the main-code generator of the transmitter and reception by the main-code decoder of the receiver of the main signal they are both set to, resetting the main-code generator and decoder to the next of the main signals in the succession except after the last main signal of the succession has been emitted and received in which case the main-code generator and decoder are reset to the first of the succession of main signals;

    thereafter on special actuation of the transmitter, after each emission by the synchronization-code generator of the transmitter and reception by the synchronization-code decoder of the synchronization signal they are both set to and after reception by the main-code decoder of the receiver of a main-code decoder is not set to, resetting the transmitter and receiver to the next of the synchronization signals in the succession except after the last synchronization signal of the succession has been emitted and received in which case the synchronization-code generator and decoder are reset to the first of the succession of synchronization signals; and

    resetting the main-code generator to the predetermined one of the main signals on emission of a synchronization signal.

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