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

• Current Assignee: Dani Adler, Shaul Adler
• Original Assignee: Dani Adler, Shaul Adler
• Inventors: Adler, Dani, Adler, Shaul
• Primary Examiner(s): Caldwell, John W.
• Assistant Examiner(s): Wannisky, William M.
• Application Number:
  US05/546,473
• Time in Patent Office: 561 Days
• Field of Search: 340/52 R, 340/52 H, 340/65, 340/261, 200/61.52, 200/61.45, 200/61.83
• US Class Current: 340/568.1
• CPC Class Codes: B60R 25/1006 Mechanical sensors, e.g. pendulums B60R25/101 takes precedence
• CPC Class Codes: B62H 5/20 indicating unauthorised use, e.g. acting on signalling devices alarm locks in general E05B45/00, e.g. alarm cable or chain lock E05B45/005
• CPC Class Codes: G08B 13/02 Mechanical actuation

Abstract

A vibration sensitive electrical alarm system comprising an electrically 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, 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.

Claims

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.

2. The system as claimed in claim 1 wherein said axle member is a coaxial plug, the pendulum is suspended from its first end while said pendent is pivotally attached at the coaxial plug'"'"'s second end and is electrically insulated from said plug'"'"'s first end.

3. The system as claimed in claim 1 further comprising a relay in circuit with said pendulum said relay being adapted to activate an alarm whenever the pendulum touches said projection.