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Position-sensitive alarm system

  • US 4,359,717 A
  • Filed: 02/14/1980
  • Issued: 11/16/1982
  • Est. Priority Date: 03/31/1979
  • Status: Expired due to Term
First Claim
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1. A vehicle alarm system adapted for installation in a vehicle havinga warning device (41, 42) triggerable upon detection of a disturbance to the vehicle andcomprisingat least one position sensitive sensor (10, 10'"'"') furnishing repetitively, continuously sequentially position output signals representative of the position of the vehicle on a support surface;

  • data storage means (30,

         51) connected to and receiving the position output signals from said sensor, and storing data representative of the position of the vehicle on the support surface;

    comparator means (34,

         53) connected to said data storage means and said position sensitive sensor and receiving stored data indicative of a prior position of the vehicle as represented by a prior position output signal as well as a then furnished position output signal, and comparing said prior and then furnished signals for detecting a deviation of the position output signal furnished by said sensor (10) from a stored value retained in the storage means,said comparator means furnishing a triggering signal to said warning device (41,

         42) when said deviation of position exceeds a predetermined amount to provide a warning when a disturbance of the position of the vehicle with respect to a prior position on said support surface is sensed by said sensor.

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