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Lock arrangement employing mechanically acting code card and key card

  • US 4,149,394 A
  • Filed: 03/28/1978
  • Issued: 04/17/1979
  • Est. Priority Date: 04/06/1977
  • Status: Expired due to Term
First Claim
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1. Lock apparatus comprising a housing, a locking member supported in said housing for movement between locked and unlocked positions, said housing and locking member having aligned bores, blocking means supported in each of said aligned bores for movement between a first position in which the locking member is movable relative to the housing and a second position in which the blocking means blocks movement of the locking member relative to the housing, a plate-like key member, a plate-like code member, said housing being provided with two slots each for respectively receiving one of said plate-like members, said bores in the housing and locking member being arranged in a pre-determined pattern, said plate-like members having respective regions corresponding to the location of said bores in said pattern, said plate-like members when inserted in said slots positioning said regions in superposed relation with one another for cooperating with said blocking means, the thickness of the card-like members in said regions being correlated in a code such that the combined thickness of said plate-like members in the superposed regions is different from the combined thickness of said plate-like members outside the superposed regions to constitute means for acting on said blocking means to mechanically move the same to said first position when said code corresponds to the pattern of the bores.

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