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Devices for the measurement of the physical state of a pneumatic tire

  • US 4,240,061 A
  • Filed: 02/23/1979
  • Issued: 12/16/1980
  • Est. Priority Date: 03/04/1978
  • Status: Expired due to Term
First Claim
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1. A system for conveying to the driver of a vehicle information concerning the physical state of a pneumatic tire fitted to a wheel of the vehicle comprising a sensing device associated with the tire and mounted on the tire or wheel for rotation therewith, a signaling device incorporated in or associated with the sensing device to generate an electrical signal bearing a known relationship to the physical state to which the sensing device is responsive, a transmitting element associated with the tire to which said electrical signal is communicated, a receiving element arranged to be in communication with the transmitting element in an electrical circuit path means comprising a portion of the tire in contact with the ground or road surface on which the vehicle is supported, the ground or road surface, and an indicating device responsive to signals received by the receiving element.

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