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Protective alarm system

  • US 3,975,722 A
  • Filed: 02/03/1975
  • Issued: 08/17/1976
  • Est. Priority Date: 02/03/1975
  • Status: Expired due to Term
First Claim
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1. A vibration sensitive electrical alarm system comprising an electrical conductive pendulum means swingably suspended from an axle member, a pendent body pivotally attached to said axle and having an electrically conductive projection secured to it extending in the direction of said pendulum means, said pendent being provided with adjustable biasing means adapted to vary its distance from said pendulum when the pendulum is at rest, wherein said biasing means is a screw adapted to turn in a thread provided in the pendent in a plane substantially normal to the longitudinal axis of the pendent and thereby to shift the weight of the pendent to overcome the force of gravity acting upon it and in turn to bias it toward one side relative the freely suspended pendulum, the arrangement being such that when the pendulum means is set into motion, it is adapted to touch said projection whereby an alarm is activated.

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