Measuring and testing – Fluid pressure gauge – Piston
Patent
1979-12-03
1981-01-27
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Piston
G01L 716
Patent
active
042467985
ABSTRACT:
The pressure indicator has a body provided with an attachment shank having a pressure fluid passage. A cylinder bore is located at one end of the body and communicates with the passage. An end plug having a bore and a counterbore is threaded into the body. The bore terminates at the plug inner end in a first annular flat abutment surface. The counterbore terminates in a second annular flat abutment surface which is located between the inner and outer ends of the plug and forms one end of the plug bore. A piston is nested in the cylinder bore having a piston rod axially extending through the cylinder bore and projecting through and outwardly of the plug. A compression spring is interposed between the plug and piston and yieldably biases the piston towards one end of the cylinder bore. The piston is variably movable longitudinally against the spring on application of pressure to the pressure fluid passage. An integral annular spring retainer and bearing assembly is provided having a bore through which the piston rod extends. The assembly has an annular bearing, an annular spring guide and a flange separating the bearing from the guide. The bearing extends into and pilots in the bore of the end plug and is spaced from the second abutment surface, with the flange abutting the first abutment surface and the spring guide piloting one end of the compression spring.
REFERENCES:
patent: 3286726 (1966-11-01), Guy
patent: 3596521 (1968-08-01), Guy
patent: 3677089 (1972-07-01), Martin
patent: 3889530 (1975-06-01), Bluem
patent: 3910120 (1975-10-01), Martin
patent: 4136560 (1979-01-01), Gellos
J. E. Myles, Inc.
Woodiel Donald O.
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