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ELECTRONIC COMBINATION LOCK SYSTEM

  • US 3,754,213 A
  • Filed: 09/03/1971
  • Issued: 08/21/1973
  • Est. Priority Date: 09/03/1971
  • Status: Expired due to Term
First Claim
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1. A combination lock system of the electronic type for selectively releasing locks at a plurality of stations and utilizing a plural digit code said system comprising:

  • an electrically releasable lock at each station, a digit selector switch assembly at each station, a code setting unit comprising a plurality of selector switches one for each digit of the code, a comparator, means connecting said switch assemblies and said comparator, means connecting said code selector switches and said comparator, enabling means for preparing said comparator to compare the selected code digit and the digit selected at said switch assemblies in predetermined order, a plurality of lock release signal generators, a plurality of memory devices one associated with each of said lock release signal generators, each of said memory devices being connected with the respective one of said switch assemblies for triggering regardless of the digit selected, means responsive to the first digit signal from said digit selector switch for preventing the actuation of all door release signal generators other than the first selected signal generator, and means dependent upon the entry of the correct code for triggering the selected signal generator to release its respective lock.

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