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Electronical unlocking method and system

  • US 4,455,588 A
  • Filed: 04/29/1982
  • Issued: 06/19/1984
  • Est. Priority Date: 04/30/1981
  • Status: Expired due to Term
First Claim
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1. An electronic unlocking system for operating an unlocking mechanism to unlock, for instance, a door, which comprises:

  • (a) a switch for generating an unlocking signal including a series of on-time intervals and off-time intervals when closed or opened manually;

    (b) a first counting unit connected to said switch for counting respective time intervals during which said switch is kept turned on and outputting signals indicative of on-time interval values X;

    (c) a second counting unit connected to said switch for counting respective time intervals during which said switch is kept turned off and outputting signals indicative of off-time interval values Y;

    (d) a memory unit connected to said switch for storing respective reference values Xo/Yo and outputting the respective reference values in response to respective on-time signals output by said switch;

    (e) a calculating unit connected to said first and second counting units for dividing respective numerical values X output by said first counting unit by respective numerical values Y output by said second counting unit and outputting signal indicative of respective divided values X/Y;

    (f) a comparing unit connected to said calculating unit and said memory unit for comparing the respective numerical values X/Y calculated by said calculating unit to the respective reference values Xo/Yo stored in said memory unit and outputting signals whenever the respective calculated values X/Y agree with the respective reference values Xo/Yo;

    (g) a third counting unit connected to said comparing unit for counting the number of the signals output by said comparing unit and outputting an unlocking command signal when the number counted by said third counting unit reaches a predetermined value; and

    (h) an unlocking actuator connected to said third counting unit for operating the unlocking mechanism when energized in response to the unlocking command signal output from said third counting unit,whereby an unlocking mechanism can be operated by repeatedly depressing and releasing a single switch in accordance with predetermined on-time and off-time interval relationships.

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