US3779080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gauge recording maximum pressure
Assignee: PROSSER INDUSTRIES Inc A CORP OF DE
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Filing: 1971-07-26
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Granted: 1973-12-18
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Expires: 1991-07-26
Abstract
Abstract Device for visual indication of a maximum fluid pressure condition reached during a given interval of time. Useful for the in-flight recording of fluid pressure condition e.g., in the reduction gear box of a jet engine where excessive pressures are indicative of incipient failures, the device comprises a body having a cavity in fluid pressure communication with system fluid, an indicator movable relative to the body cavity in response to changes in system fluid pressure, and locking means limiting indicator travel to a single direction indicative of a relatively higher pressure condition in the system.
Inventors
- 👤 C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:00
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/08; G01L19/10; G01L7/00; G01L7/02; G01L7/08; G01L7/086
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
Device for indicating highest fluid pressure experienced over time in a system experiencing varying pressure conditions, comprising a pressure resistant body defining a body cavity and having a rod passing in the top wall portion of the device and communicating with said cavity and a boss on said top wall eccentric to said opening and port means communicating said cavity continuously with system fluid pressure, a piston mounted and sealed within the body cavity between said opening and said port means for fluid pressure responsive movement, an indicator rod carried by the piston for varying extension through said rod passing opening responsive to piston movement; and locking means limiting said indicator rod travel to one way movement responsive to a higher experienced pressure in the system comprising a locking member having a ring portion encircling the indicator rod, said boss defining a pivot shoulder to operatively coact with the locking member so that the member ring portion binds the indicator rod against return movement if the pressure drops below the highest experienced pressure in the system.
Claim 2
Dependent Claim
176 words
Device for indicating highest fluid pressure experienced over time in a system experiencing varying pressure conditions, comprising a pressure resistant body defining a body cavity and having a rod passing in the top wall portion of the device and communicating with said cavity and a boss on said top wall eccentric to said opening and port means communicating said cavity continuously with system fluid pressure, a piston mounted and sealed within the body cavity between said opening and said port means for fluid pressure responsive movement, an indicator rod carried by the piston for varying extension through said rod passing opening responsive to piston movement; and locking means limiting said indicator rod travel to one way movement responsive to a higher experienced pressure in the system comprising a locking member having a ring portion encircling the indicator rod, said boss defining a pivot shoulder to operatively coact with the locking member so that the member ring portion binds the indicator rod against return movement if the pressure drops below the highest experienced pressure in the system.
Claim 3
Dependent Claim
23 words
Fluid pressure indicating device according to claim 1 including also spring means resiliently biasing said member ring portion into engagement with said boss.
Claim 4
Dependent Claim
46 words
Fluid pressure indicating device according to claim 1 including also a piston support, said piston support comprising a diaphragm fluid tightly secured to the body cavity wall and extending transversely of the cavity, said diaphragm being centrally flexible for movably supporting the piston within said cavity.
Claim 5
Dependent Claim
46 words
Fluid pressure indicating device according to claim 3 in which said indicator rod is carried by the piston face remote to said cavity port and for longitudinal axial movement into and out of said cavity to variously project through said rod passing opening beyond the body.
Claim 6
Dependent Claim
32 words
Fluid pressure indicating device according to claim 4 including also indicator rod travel guide means comprising structure slidably engaging the cavity wall and adapted to move with the rod in guiding relation.
Claim 7
Dependent Claim
27 words
Fluid pressure indicating device accordng to claim 1 in which said rod is rectangular in cross section and has sharply defined longitudinally extended corners and flats therebetween.
Claim 8
Dependent Claim
40 words
Fluid pressure device according to claim 7 including also a finger engageable tab projecting from the ring portion of the locking member for pivoting said member about said boss to release the member ring portion from engagement with said rod.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |