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Pressure indicating devices

  • US 6,588,264 B1
  • Filed: 02/08/1999
  • Issued: 07/08/2003
  • Est. Priority Date: 05/07/1996
  • Status: Expired due to Fees
First Claim
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1. A pressure indicating device comprising a housing which includesan inlet for air under pressure;

  • a permanently hermetically sealed chamber sealed during manufacture of the device, said chamber containing a gas under pressure;

    a signaling device constructed and arranged to provide a signal that depends on pressure difference between the inlet and the chamber;

    a flexible impermeable diaphragm separating the inlet and the chamber, the diaphragm constructed and arranged to flex and extend into the chamber as pressure at the inlet increases; and

    a connecting means between the diaphragm and the signaling device to actuate the signaling device to provide a signal indicative of inlet pressure relative to pressure of the sealed chamber.

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