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AUTOMOBILE THEFT ALARM WITH IGNITION CONTROLLED AUTOMATIC ARMING MEANS

  • US 3,829,829 A
  • Filed: 12/04/1972
  • Issued: 08/13/1974
  • Est. Priority Date: 01/12/1972
  • Status: Expired due to Term
First Claim
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1. A control circuit having an output node and a control switch with at least three operative positions, comprising a voltage source, first and second lead lines, said control switch adapted in a first position to connect said voltage source to said first lead line, in a second position to connect said voltage source to said first and second lead lines, and in a third position to disconnect both said first and second lead lines from said voltage source, said output node being operatively connected to said first lead line, first switch means having a control and having its output circuit operatively connected between said voltage source and said first lead line, capacitive storage means operatively connected to said control terminal of said first switch means, means operatively connecting said capacitive storage means to said first lead line whereby said capacitive storage means is charged during a predetermined time interval when said control switch is in said first position, and second switch means having a control terminal and having its output circuit operatively connected to said control terminal of said first switch means in parallel with said capacitive storage means and adapted when closed to shunt said capacitive storage means, said control terminal of said second switch means being operatively connected to said second lead line, thereby preventing said capacitive storage means from being charged when said control switch is in said second position, said first switch means being adapted when said control switch is moved from said first position to said third position after said predetermined interval in said first position, to latchingly connect said output node to said voltage source.

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