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MOVEMENT DETECTOR

  • US 3,618,067 A
  • Filed: 11/04/1969
  • Issued: 11/02/1971
  • Est. Priority Date: 11/04/1969
  • Status: Expired due to Term
First Claim
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1. A monitoring system for protecting a plurality of movable objects comprising, a plurality of transmitters connected to said plurality of movable objects, each of said transmitters having means for turning it off when the transmitters move relative to its associated movable object, said means for turning each transmitter off comprising a magnetic responsive switch connected to the respective transmitter and which turns the transmitter on when the transmitter is placed near a magnetic material of said movable object but which turns it off when said transmitter is removed from said movable object, receiving means located at a position remove from said transmitters receiving a plurality of signals from said plurality of transmitters, distributing means including a sequential scanning means connected to the output of said receiving means, a plurality of alarms connected to said distributing means and adapted to indicate when one of said plurality of transmitters is turned off or when one of the transmitters is moved relative to the receiving means out of the range of a signal effective to prevent the alarm from being actuated, and a second alarm system connected in circuit with said plurality of alarms and located at a remote position from said receiving means to indicate at a remote position when one of the plurality of transmitters is turned off or moved, and further including means including a reset switch whereby when said second alarm is energized the system cannot be rendered inactive at the position of the receiving means.

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