SELF-POWERED WIRELESS INTRUSION ALARM SYSTEM

• US 3,781,836 A
• Filed: 07/14/1972
• Issued: 12/25/1973
• Est. Priority Date: 07/14/1972
• Status: Expired due to Term

• Current Assignee: Andrew P. Kruper, John R. Reeves, Leonard C. Vercellotti
• Original Assignee: Andrew P. Kruper, John R. Reeves, Leonard C. Vercellotti
• Inventors: Reeves, John R., Vercellotti, Leonard C., Kruper, Andrew P.
• Primary Examiner(s): Yusko, Donald J.
• Application Number:
  US05/271,879
• Time in Patent Office: 529 Days
• Field of Search: 340/224,274 331/185 332/2 325/185 310/14,15
• US Class Current: 340/539.3
• CPC Class Codes: G08B 13/06 by tampering with fastening
• CPC Class Codes: G08B 13/08 by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind

Abstract

The invention pertains to an alarm system including a magnetic pulse generator for producing an output pulse in response to a change in magnetic flux in response to an intrusion of a designated area, a radio transmitter circuit responding to the pulse from the magnetic pulse generator by transmitting a signal to a remote receiver circuit which in turn generates a pulse for actuating an intrusion alarm circuit.

Claims

1. In a self-powered wireless intrusion alarm system for responding to disturbance of an object such as a window or a door, the combination of, a magnetic pulse generator means including a magnet having a north and south pole, a pole piece and an electrical coil operatively associated therewith, said pole piece aligned with said north and south poles to establish a path of magnetic flux, actuator means operatively connected between said object and said magnetic pulse generator means for maintaining said pole piece and said magnet in a preset relationship in the absense of a disturbance of said object, said actuator means disrupting said preset relationship of said magnet and said pole piece in response to a disturbance of said object to cause relatively rapid movement of said magnet and said pole piece either toward or away from one another to produce a rapid change in the magnetic flux and a corresponding electrical output pulse in said coil, RF transmitter circuit means operatively connected to said magnetic pulse generator means and responding to said output pulse from said magnetic pulse generating means by transmitting a corresponding RF signal, and radio receiver circuit means responding to said RF output signal by generating an output signal suitable for actuating an intrusion alarm circuit.

2. In a self-powered wireless intrusion alarm system as claimed in claim 1 wherein said actuator means includes means for maintaining said magnet and said pole piece in a latched spaced apart relationship during said preset condition, and bias means for causing rapid relative movement of said pole piece and said object toward one another to produce an electrical output signal in response to a disturbance of said object.