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US 5,181,422 AGranted
Diaphragm type fluid pressure gauge
AssigneeDresser Industries, Inc.
InventorsRobert F. Leonard, Carl J. Styckiewicz
Life of this patent
Estimating the term…
Abstract
A diaphragm type fluid pressure gauge comprises a case formed of an injection molded thermoplastic. The bottom wall of the case selectively defines a rear axial fluid connection or a radial fluid connection to a fluid chamber defined within the case. The fluid chamber is closed by a diaphragm which is clamped against an annular radial surface in the case by a thermoplastic ring which is melt-welded to the case. The other face of the ring provides a mounting for a movement mechanism for driving a pointer in response to axial displacement of the diaphragm.
Claims12
A diaphragm operated, fluid pressure gauge comprising, in combination:
- a molded thermoplastic case having a generally cup-shaped configuration with an annular side wall and an integral base portion;
- said base portion defining a chamber having an open end defined by an annular sealing surface;
- an annular gasket sealable on said annular sealing surface;
- a circular diaphragm having a peripheral rim portion abuttable with said annular gasket;
- a thermoplastic retaining ring having two radial side surfaces, one of said radial side surfaces being abuttable with said peripheral rim portion of said diaphragm to clamp said peripheral rim portion of said diaphragm to clamp said peripheral rim portion in sealing engagement with said annular gasket and said annular gasket in sealing relation with said annular sealing surface;
- said thermoplastic retaining ring being melt-welded to said base portion at a plurality of peripheral regions radially outside said gasket;
- means on the other of said retaining ring radial side surfaces for mounting a pointer operating movement in operative relationship with the central portions of said diaphragm;
- and
- means in said base portion defining a fluid passage between said chamber and a source of fluid pressure to be measured.
6 more elements
A diaphragm operated, fluid pressure gauge comprising, in combination:
- a molded thermoplastic case having a generally cup-shaped configuration with an annular side wall and an integral base portion;
- said base portion defining a central, outwardly opening recess and an inwardly facing annular sealing surface disposed in surrounding relation to the axis of said outwardly opening recess;
- an annular gasket sealable on said annular sealing surface;
- a circular diaphragm having a peripheral rim portion abuttable with said annular gasket;
- a thermoplastic retaining ring having two radial side surfaces, one of said radial side surfaces being abuttable with said peripheral rim portion in sealing engagement with said annular gasket and said annular gasket in sealing relation with said annular sealing surface;
- said thermoplastic retaining ring being melt-welded to said base portion at a plurality of peripheral regions radially outside said gasket;
- means on the other of said retaining ring radial side surfaces for mounting a pointer operating movement in operative relationship with the central portions of said diaphragm;
- and
- fluid passage means communicating between said central outwardly opening recess and the side of said diaphragm opposite to said plastic retaining ring.
6 more elements
A diaphragm operated, fluid pressure gauge comprising, in combination:
- a molded thermoplastic case having a generally cup-shaped configuration with an annular side wall and an integral base portion;
- said base portion defining a central, outwardly opening recess and an inwardly facing annular sealing surface disposed in surrounding relation to the axis of said outwardly opening recess;
- an annular gasket sealable on said annular sealing surface;
- a circular diaphragm having a peripheral rim portion abuttable with said annular gasket;
- a thermoplastic retaining ring having two radial side surfaces, one of said radial side surfaces being abuttable with said peripheral rim portion of said diaphragm to clamp said peripheral rim portion in sealing engagement with said annular gasket and said annular gasket in sealing relation with said annular sealing surface;
- said thermoplastic retaining ring being melt-welded to said base portion at a plurality of peripheral regions radially outside said gasket;
- means on the other of said retaining ring radial side surfaces for mounting a pointer operating movement in operative relationship with the central portions of said diaphragm;
- said base portion further defining a radial outwardly opening recess;
- a fluid conduit connector selectively sealably insertable in either said central or said radial recess;
- and
- a fluid passage formed in the bottom of the recess selected for insertion of said fluid conduit connector, said fluid passage communicating with the side of said diaphragm opposite said retaining ring.
8 more elements
Dependencies are inferred from the claim text.