Pressure sensitive indicating device

Details Pressure sensitive indicating device Pressure sensitive indicating device

1979-06-13

1981-04-21

Weakley, Harold W.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

137227, 73730, 116 34R, 116DIG8, B60C 2304

Patent

active

042625297

ABSTRACT:
The disclosure relates to a pressure sensitive indicating device of extremely simplified nature, providing a visual indication of a predetermined pressure threshold level. A typical and advantageous form of the device is a valve or valve extension member for a pneumatic tire, providing a visual indication of the existence or not of a desired pressure level. The device, in its most basic form, comprises an element formed of a natural or synthetic deformable elastomer, designed to expand upon exposure to increasing pressure levels. A covering element is associated with the deformable elastomer and is displaced by distention of the elastomer. By providing the deformable elastomer in a distinctively different color than the cover element, the displacement of the cover upon pressurization to a desired threshold, is readily evident to the observer.

REFERENCES:
patent: 3536026 (1970-10-01), Miller
patent: 3670688 (1972-06-01), Seaberg
patent: 4018231 (1977-04-01), Wallace
patent: 4134407 (1979-01-01), Elam
patent: 4185638 (1980-01-01), Bruner

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