Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1975-09-29
1977-06-14
Woodiel, Donald O.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
73396, 73419, 73420, B60C 2302, G01L 716
Patent
active
040289362
ABSTRACT:
A pressure gauge for indicating the fluid pressure at a source of pressure such as a tire, for example, has a chamber formed within a body. When the body is disposed on a tire valve stem, for example, a portion of the body depresses a valve core plunger of the valve stem to enable the pressurized fluid in the tire to flow through a longitudinal passage in the body and past a flap valve, which is an O-ring, into the chamber. This pressurized fluid in the chamber acts on a piston head of a piston, which is slidably disposed in a passage in the body communicating with the chamber, to move the piston against the force of a spring within the body passage. An O-ring is mounted in the piston head to seal the body passage. The O-ring acts as an indicator through cooperation with a scale on the body to indicate the pressure of the fluid in the chamber in the body; this is the same pressure as that in the tire since the tire is communicating with the chamber. When the body is removed from the tire valve stem, the flap valve prevents communication between the longitudinal passage and the chamber to retain the pressurized fluid within the chamber to hold the piston in the position to which it is moved. When the pressure has been read after removal from the tire valve stem, a flap valve, which is part of the same O-ring controlling the communication of the pressurized fluid into the chamber, is opened to vent the chamber to the atmosphere. The O-ring has portions diametrically disposed functioning as the flap valves to control the flow of fluid into and out of the chamber.
REFERENCES:
patent: 1148361 (1915-07-01), Coxe
patent: 2989076 (1961-06-01), Rohmann
patent: 3216451 (1965-11-01), Smallpeice
Leach, Jr. Frank C.
Woodiel Donald O.
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