Self powered electronic combination lock having comprehensive monitoring of power levels for various functions

  • US 5,632,169 A
  • Filed: 06/06/1995
  • Issued: 05/27/1997
  • Est. Priority Date: 10/29/1993
  • Status: Expired due to Term
First Claim
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1. A self-powered lock, comprising:

  • a) a bolt capable of being extended from and withdrawn into the lock;

    b) means, responsive to entry of a correct combination, for enabling the bolt to be withdrawn into the lock, the enabling means having;

    1) an "engage" position in which the bolt can be withdrawn into the lock; and

    2) a "disengage" position in which the bolt cannot be withdrawn into the lock;

    c) means within the lock for storing energy for operation of certain components of the lock;

    d) means for monitoring an energy level of the storing means; and

    e) means, responsive to the monitoring means, for preventing the enabling means from moving from the "disengage" position to the "engage" position if the monitored energy level is below a given energy threshold;

    wherein the given energy threshold is greater than or equal to an amount of energy required to subsequently move the enabling means from the "engage" position back to the "disengage" position after a predetermined time period.

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