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Tire internal pressure alarm device

  • US 8,138,904 B2
  • Filed: 08/10/2007
  • Issued: 03/20/2012
  • Est. Priority Date: 08/11/2006
  • Status: Expired due to Fees
First Claim
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1. A tire internal pressure alarm device having a casing in which a pressure sensor for detecting an internal pressure of a tire and electronic components for processing signals with regard to the internal pressure are embedded, the casing being provided with a pressure introduction passage for introducing the internal pressure from a pressure introduction aperture formed on an outer surface of the casing to a pressure sensing portion of the pressure sensor, wherein an elastic member constituting at least a part of a labyrinth structure is positioned between an inner surface of the casing and a front face of the pressure sensing portion of the pressure sensor.

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