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Tire pressure indicator

  • US 5,694,111 A
  • Filed: 12/23/1996
  • Issued: 12/02/1997
  • Est. Priority Date: 12/23/1996
  • Status: Expired due to Term
First Claim
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1. A tire pressure indicator for a set of pneumatic tires of a vehicle, comprising:

  • a plurality of pressure gauges respectively attached to the pneumatic tires, each of said pressure gauges including;

    a casing with a hollow adaptor adapted to be attached to the pneumatic tire, an inlet and a finger piece for opening an inflating valve of the pneumatic tire; and

    a signal generating device disposed in said casing, said signal generating device includinga pressure sensing unit which generates an analog voltage signal that varies in accordance with pressure imposed on said inlet,a signal converting unit electrically connected to said pressure sensing unit for converting the analog voltage signal into a digital output signal,an encoder unit electrically connected to said signal converting unit, said encoder unit comparing the digital output signal of said signal converting unit with high pressure and low pressure limits of a predetermined normal operating pressure range, said encoder unit generating a coded signal which includes the digital output signal and an identification code unique to that gauge when the digital output signal is not within the operating pressure range, anda signal transmitter circuit electrically connected to said encoder unit for transmitting the coded signal from said encoder unit wirelessly; and

    a receiver device including a signal receiver circuit for receiving the coded signal transmitted by said signal generating device of said pressure gauges.

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