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
042467993
ABSTRACT:
The vacuum indicator has a body with an attachment shank having a fluid passage. A cylinder bore is located in the body and communicates with the passage. An end plug having a bore and a counterbore is threaded into the body. The bore of the end plug terminates at the inner end in a first annular flat abutment surface which faces one end of the body. 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 and has a piston rod secured thereto, with the piston rod projecting axially through and outwardly of the end plug. An annular bearing element is located in the plug bore and surrounds the piston rod. The piston has an annular end surface facing the first abutment surface. A compression spring is interposed at its ends between one end of the cylinder bore and the piston and yieldably biases the piston towards the first abutment surface. The piston is variably movable longitudinally against the spring towards said one end of the cylinder bore on application of a vacuum to the fluid passage.
REFERENCES:
patent: 3286726 (1966-11-01), Guy
patent: 3596521 (1971-08-01), 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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