Patent US4323741A successfully refreshed from Google Patents.
US4323741A
Expired / Lapsed
US
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Mechanical deflection apparatus for sensing fluid pressure
Assignee: Graco Inc
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Filing: 1980-05-27
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Granted: 1982-04-06
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Expires: 2000-05-27
Abstract
Abstract Apparatus is disclosed for sensing fluid pressure by mechanical flexure of a tube according to the principles of the Bourdon tube, wherein the tube forms a part of the fluid flow path, and where the pressure may be sensed during both dynamic and static fluid flow conditions.
Inventors
- 👤 Duane D. Krohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:08
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02; G01L7/04; G01L7/041
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
A fluid pressure sensing and switching apparatus for insertion in series fluid flow relationship in a pressurized fluid flow line, comprising (a) a housing having an inlet and outlet for respective connection in series flow relation to said fluid flow line; (b) a pair of curved tubes in generally parallel alignment, one end of one of said tubes coupled to said housing inlet and one end of the other of said tubes coupled to said housing outlet, the respective other ends of each of said tubes being freely suspended; (c) a flow through manifold coupled between the respective other ends of said tubes; (d) a bracket attached to said housing, said bracket having an L-shaped member with a free end proximate said manifold; and (e) a switch mounted on said bracket, said switch having an actuator in close proximity to said manifold.
Claim 2
Dependent Claim
142 words
A fluid pressure sensing and switching apparatus for insertion in series fluid flow relationship in a pressurized fluid flow line, comprising (a) a housing having an inlet and outlet for respective connection in series flow relation to said fluid flow line; (b) a pair of curved tubes in generally parallel alignment, one end of one of said tubes coupled to said housing inlet and one end of the other of said tubes coupled to said housing outlet, the respective other ends of each of said tubes being freely suspended; (c) a flow through manifold coupled between the respective other ends of said tubes; (d) a bracket attached to said housing, said bracket having an L-shaped member with a free end proximate said manifold; and (e) a switch mounted on said bracket, said switch having an actuator in close proximity to said manifold.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1, further comprising a shaft threaded through said housing and having an end connected to the free end of said bracket.
Claim 4
Dependent Claim
22 words
The apparatus of claim 2, further comprising an actuator plate attached to said manifold at a position adjacent to said switch actuator.
Claim 5
Dependent Claim
18 words
The apparatus of claim 3, further comprising a turnable knob attached to said shaft external of said housing.
Claim 6
Dependent Claim
13 words
The apparatus of claim 4, further comprising cover means for enclosing said housing.
Claim 7
Dependent Claim
92 words
A fluid pressure sensing apparatus comprising a mounting base; a pair of curved hollow tubes in generally parallel alignment, and attached at respective adjacent first ends to said mounting base and unattached to said mounting base at respective adjacent second ends; means for coupling each of said respective adjacent first tube ends to respective pressurized fluid line connections in series flow arrangement; a flow tube coupled between respective adjacent second tube ends; and a switch attached to said mounting base and having an actuator placed in close proximity to said flow tube.
Claim 8
Dependent Claim
92 words
A fluid pressure sensing apparatus comprising a mounting base; a pair of curved hollow tubes in generally parallel alignment, and attached at respective adjacent first ends to said mounting base and unattached to said mounting base at respective adjacent second ends; means for coupling each of said respective adjacent first tube ends to respective pressurized fluid line connections in series flow arrangement; a flow tube coupled between respective adjacent second tube ends; and a switch attached to said mounting base and having an actuator placed in close proximity to said flow tube.
Claim 9
Dependent Claim
18 words
The apparatus of claim 6, further comprising means for positioning said switch actuator relative to said flow tube.
Claim 10
Dependent Claim
17 words
The apparatus of claim 7, further comprising a bracket attached between said mounting base and said switch.
Claim 11
Dependent Claim
23 words
The apparatus of claim 8, wherein said means for positioning comprises a threaded member operably coupled between said mounting base and said bracket.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |