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
042467977
ABSTRACT:
The pressure indicator has a body provided with an attachment shank having a pressure 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. A piston is nested in the cylinder bore and has 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 the fluid passage against the pressurized fluid. The improvement resides in the provision of a backup bushing nested within the plug bore which axially and guidably receives the piston rod. A cylindrical slide seal of a permanently lubricated material is nested within the plug bore and projects into and depends from the bushing in sealing engagement with the piston rod. An integral spring retainer and bearing assembly has a bore through which the piston rod extends and includes an annular bearing which extends into the plug bore and is spaced from the backup bushing. An O-ring in the plug bore is sealingly interposed between the plug and the slide seal and occupies the space between the bushing and bearing.
REFERENCES:
patent: 1250414 (1917-12-01), Austin
patent: 1392587 (1921-10-01), Low
patent: 1716399 (1929-06-01), Watters
patent: 3286729 (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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