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Wireless alarm system

  • US 4,157,540 A
  • Filed: 07/13/1976
  • Issued: 06/05/1979
  • Est. Priority Date: 07/13/1976
  • Status: Expired due to Term
First Claim
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1. A wireless alarm system activated selectively by a person which comprises:

  • a portable wireless transmitter assembly adapted to be concealed on the person, said assembly comprising;

    a pressure actuated normally open contact switch adapted to be closed under pressure applied by the person, alerting means activated by the pressure actuated switch for alerting the person by a tactually perceivable signal when said switch is closed, timer means activated by the pressure actuated switch when said switch is closed, a radio transmitter activated by said timer means for transmitting a coded wireless alarm signal on at least one predetermined radio frequency, said timer means activating the radio transmitter a predetermined period of time after the pressure actuated switch is closed, and a battery power supply for the alerting means, timer means and radio transmitter;

    a radio receiver and signal decoder for receiving the coded wireless signal transmitted by the radio transmitter;

    an adjustable timer and signal relay means connected to the radio receiver for relaying the alarm signal on to personnel alerting means of the alarm system a predetermined period of time after the coded wireless alarm signal is received by the radio receiver; and

    personnel alerting means activated by the alarm signal received from the adjustable timer and signal relay means.

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