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Pressure gauge with self-generating power capability for a tire pressure indicator

  • US 5,781,104 A
  • Filed: 07/22/1997
  • Issued: 07/14/1998
  • Est. Priority Date: 12/23/1996
  • Status: Expired due to Fees
First Claim
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1. A pressure gauge adapted to be used with a receiver device of a tire pressure indicator for indicating pressure condition of a pneumatic tire, said pressure gauge comprising:

  • a casing formed with an aperture and adapted to be mounted on the pneumatic tire such that pressure in the pneumatic tire enters into said casing via said aperture;

    a signal generating device disposed in said casing and capable of transmitting wirelessly a pressure signal to be received by the receiver device when the pressure in the pneumatic tire is not within a predetermined normal operating pressure range; and

    a power supplying device disposed in said casing and connected electrically to said signal generating device so as to supply electric power for operating said signal generating device, said power supplying device including a self-generating voltage unit which has a piezoelectric unit and an impact unit that is capable of continuously striking against said piezoelectric unit when the pneumatic tire to which said casing is mounted is in motion so as to enable said piezoelectric unit to generate a voltage output, a rechargeable cell unit, and a rectifying-and-charging unit which interconnects said self-generating voltage unit and said rechargeable cell unit to permit charging of said rechargeable cell unit with said voltage output from said self-generating voltage unit.

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