US3874241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-filled pressure gauge
Assignee: Ametek Inc
•
Filing: 1973-03-15
•
Granted: 1975-04-01
•
Expires: 1993-03-15
Abstract
Abstract A liquid-filled gauge has a cylindrical casing with a spring relief valve positioned in the closed end wall of the casing. The cylindrical side wall is provided with an aperture for filling the casing with liquid and a plug is retained within said aperture before it is installed. The inner end of the plug is provided with spaced flanges which engage opposite edges of an opening formed in a lip within said casing to retain the plug in the shipping position and then in the operating position when the plug is inserted completely into the wall aperture.
Inventors
- 👤 Philip W Harland
- 👤 Ralph D Waite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:10
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02; G01L7/04; G01L19/00; G01L19/06; G01L19/0618; G01L19/0672
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
In a liquid filled pressure gauge, the combination including a casing having a filling aperture therein, plug means inserted in said aperture to seal the liquid within said casing, and axially spaced locking flanges on said plug means lockingly engageable with said filling aperture for retaining said plug means in completely sealed and closed position after gauge installation, with said plug means and the axially spaced locking flanges thereon being manually moved relative to said aperture to completely open locked position for relief venting, and said plug means being manually moved to return said plug means to closed locked position after venting.
Claim 2
Dependent Claim
102 words
In a liquid filled pressure gauge, the combination including a casing having a filling aperture therein, plug means inserted in said aperture to seal the liquid within said casing, and axially spaced locking flanges on said plug means lockingly engageable with said filling aperture for retaining said plug means in completely sealed and closed position after gauge installation, with said plug means and the axially spaced locking flanges thereon being manually moved relative to said aperture to completely open locked position for relief venting, and said plug means being manually moved to return said plug means to closed locked position after venting.
Claim 3
Dependent Claim
56 words
In a liquid-filled pressure gauge as claimed in claim 1 wherein said lower flange is rounded to be forced through said opening and to engage the lower edge of the opening when the plug is in the shipping position, a portion of the plug protruding above the outer surface of the casing in the shipping position.
Claim 4
Dependent Claim
35 words
In a liquid-filled pressure gauge as claimed in claim 1 wherein the plug is inserted completely in said aperture in the operating position and the next lower flange engages the lower edge of the opening.
Claim 5
Dependent Claim
51 words
In a liquid-filled pressure gauge as claimed in claim 1 wherein there is a pressure relief valve in said casing, said pressure relief valve serving to relieve pressure from within said casing in the event said plug means is not open or pressure rises above a safe value in said casing.
Claim 6
Dependent Claim
40 words
In a liquid-filled pressure gauge as claimed in claim 4 wherein said casing is cylindrical with a closed end wall, and said pressure relief valve is in said end wall and said plug in the cylindrical wall of said casing.
Claim 7
Dependent Claim
67 words
In a liquid-filled pressure gauge as claimed in claim 4 and including means in said casing defining a valve seat, said pressure valve comprising a flange valve member and a stem extending into said casing, said valve flange being seated on said valve seat in the closed position, and spring means connected to said valve stem within said casing to urge said valve into the closed position.
Claim 8
Dependent Claim
19 words
In a liquid-filled pressure gauge as claimed in claim 6 wherein said spring means comprises a bowed leaf spring.
Claim 9
Dependent Claim
60 words
In a liquid-filled pressure gauge as claimed in claim 1 having a casing with an aperture therein, the combination including a pressure relief valve, said valve being insertable into said aperture in the wall of said casing, said valve including a flange member and stem, and spring means connected to said valve stem to urge said valve into closed position.
Claim 10
Dependent Claim
19 words
In a liquid-filled pressure gauge as claimed in claim 8 wherein said spring means is a bowed leaf spring.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |