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Low tire pressure alarm system for pneumatic tires

  • US 3,950,726 A
  • Filed: 09/20/1974
  • Issued: 04/13/1976
  • Est. Priority Date: 10/01/1973
  • Status: Expired due to Term
First Claim
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1. A low tire pressure alarm system for a pneumatic tire on a vehicle wheel including a wheel disc, a rim securely mounted on said wheel disc and having flanges for holding said tire, and a wheel cap casing covering an outer side of said wheel, said alarm system comprising in combination:

  • a low tire pressure detector in pneumatic communication with the interior of said tire for detection of a tire pressure drop below a predetermined level;

    a hollow casing of a non-conductive material securely mounted on and substantially at the center of said wheel cap casing of said vehicle wheel;

    a radio transmitter accommodated in said hollow casing and including a transmitting antenna in insulated relation with said wheel disc of said vehicle wheel and an oscillator having a resonance circuit electrically connected to said transmitting antenna and said wheel disc for producing an alarm signal of a predetermined frequency between said transmitting antenna and said wheel disc upon detection of an abnormal tire pressure drop by said detector; and

    a receiving set including a receiving antenna mounted on the underside of a vehicle body for reception of an alarm signal transmitted from said radio transmitter and a radio receiver unit connected to said receiving antenna for actuating alarm means in response to said alarm signal.

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