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Arrangement for removing a conditional ban on the operation of a lock

  • US 4,774,512 A
  • Filed: 11/30/1987
  • Issued: 09/27/1988
  • Est. Priority Date: 03/29/1985
  • Status: Expired due to Term
First Claim
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1. In combination:

  • (a) a lock for a safe, strong box or other protected enclosure, said lock comprising;

    (i) rod linkage means arranged to be moved between a locking position and an unlocking position, and(ii) key actuated, time independent lock means for opposing the movement of said rod linkage means from said locking position towards said unlocking position;

    (b) time dependent lock means for placing and removing a conditional ban upon movement of said rod linkage means, said time dependent means comprising electromechanical blocking means, also associated with said rod linkage means, for opposing the movement thereof from said locking position to said unlocking position; and

    (c) electronic circuit means connected to said electromechanical blocking means for controlling the latter, said electronic circuit means comprising;

    (i) memory means in which is stored a time schedule program to be cyclically executed and defining at least one time slot of ban removal,(ii) means, associated with said memory means, for periodically effecting a comparison of the time of day with time data of said time schedule program, said time data representing moments framing said time slot, and(iii) means for controlling the blocking means, thereby respectively to block or release said electromechanical blocking means when there is equality between the time of day and said moments; and

    wherein said key-actuated, time independent means is actuatable regardless of whether said blocking means is blocked or released.

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