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AUTOMATIC DEVICE FOR SIGNALING FROGMAN ACCIDENTS

  • US 3,786,406 A
  • Filed: 09/03/1971
  • Issued: 01/15/1974
  • Est. Priority Date: 09/03/1970
  • Status: Expired due to Term
First Claim
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1. An automatic device for signaling the accident of a frogman comprising a pulse generator having an amplifier, said amplifier including a transducer for transforming pulses generated by said pulse generator and amplifier by said amplifier into acoustical pulses, transmitter means for transmitting said acoustical pulses through an aqueous medium, and receiving means for receiving said acoustical pulses transmitted through said aqueous medium and for transforming said acoustical pulses into electrical pulses, said receiving means including filtering means for preventing acoustical interference, means for amplifying said electrical pulses, said means for amplifying electrical pulses including loudspeaker means for diffusing said electrical pulses as audible signals into the air, said pulse generator including an electronic timer having lever means which, when actuated at a pre-set periodic interval, resets said electronic timer to reduce the repetitive frequency of the pulses generated by said pulse generator so that, in the event of an accident and the failure of the frogman to activate said lever at said pre-set periodic frequency, an audible signal at a higher frequency is diffused by said loud-speaker means.

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