×

Mischief preventive electronic lock device

  • US 4,477,806 A
  • Filed: 09/29/1982
  • Issued: 10/16/1984
  • Est. Priority Date: 10/02/1981
  • Status: Expired due to Term
First Claim
Patent Images

1. In an electric lock device including a lock mechanism, a push-button input unit for entry of an input code, a memory for storing a preset code which can be read out in response to input of said input code, a comparator for comparing said input code with said preset code to produce a drive signal for actuating said lock mechanism to either of a locking and an unlocking position when said input code and said preset code match,a mischief preventive system comprising:

  • a counter for counting occurrences of all input pushbutton keystrokes via said input unit and producing a counter signal when the number of said occurrences reaches a predetermined value, anddisabling means, associated with said input unit and responsive to said counter signal, for disabling said input unit to disable further input occurrences therefrom for a predetermined period of time, said disabling means operable after expiration of said predetermined period of time for permitting a given number of occurrences of input via said input unit after said input unit is once disabled.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×