US3581774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant pressure accumulator
Assignee: United States Department of the Navy
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Filing: 1969-04-01
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Granted: 1971-06-01
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Expires: 1989-04-01
Abstract
Abstract An accumulator for maintaining a substantially constant pressure above ambient in a hydraulic system including a hollow cylinder which has an opening at one location to ambient and an opening at another location for communication with the hydraulic system; a piston and pushrod disposed in the cylinder for reciprocatory movement between the open locations; and a negator spring which has an arcuate end which is connected to the pushrod and an opposite end which is connected to the cylinder. A rolling diaphragm may be connected to an end of the piston and to the cylinder at a location about the piston wall.
Inventors
- 👤 Ernest N Oeland Jr
- 👤 Gary D Drage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:52
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/04; F16L55/045; F16L55/05; F16L55/052; F15; F15B; F15B1/00; F15B1/02; F15B1/04; F15B2201/00; F15B2201/20; F15B2201/21; F15B2201/30; F15B2201/31; F15B2201/315; F15B2201/3151; F15B2201/3158; F15B2201/32; F15B2201/40; F15B2201/41; F15B2201/413
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
An accumulator for maintaining a substantially constant pressure above ambient in a hydraulic system comprising: a hollow cylinder which has an opening at one location to ambient and has an opening at another location for communication with the hydraulic system; a piston and pushrod disposed in the cylinder for reciprocatory movement between the open locations; a negator spring which has an arcuate end which is connected to the push rod and an opposite end which is connected to said cylinder; a roller rotatably connected to said pushrod; the arcuate end of said negator spring being connected to the push rod by arcing about said roller; a bottom end of the cylinder having a counterbore; a plate disposed in the bottom counterbore, said plate having an angular projection; and said opposite end of the negator spring being connected to the cylinder by being connected to said projection.
Claim 2
Dependent Claim
146 words
An accumulator for maintaining a substantially constant pressure above ambient in a hydraulic system comprising: a hollow cylinder which has an opening at one location to ambient and has an opening at another location for communication with the hydraulic system; a piston and pushrod disposed in the cylinder for reciprocatory movement between the open locations; a negator spring which has an arcuate end which is connected to the push rod and an opposite end which is connected to said cylinder; a roller rotatably connected to said pushrod; the arcuate end of said negator spring being connected to the push rod by arcing about said roller; a bottom end of the cylinder having a counterbore; a plate disposed in the bottom counterbore, said plate having an angular projection; and said opposite end of the negator spring being connected to the cylinder by being connected to said projection.
Claim 3
Dependent Claim
51 words
Accumulator as claimed in claim 1 including: a top portion of said cylinder having a counterbore; an annular guide member connected to the pushrod intermediate its ends and slidably disposed in the top counterbore; and the opening in which is communicable with the hydraulic system being located below the top counterbore.
Claim 4
Dependent Claim
39 words
An accumulator as claimed in claim 2 wherein: the wall of the piston is spaced from the inner wall of the cylinder; and including; guide means at the top of the piston for slidable action along the cylinder wall.
Claim 5
Dependent Claim
23 words
An accumulator as claimed in claim 3 including: means located at the top of the cylinder for stopping upward movement of the piston.
Claim 6
Dependent Claim
30 words
An accumulator as claimed in claim 4 including: a rolling diaphragm connected to the bottom end of the piston and to the cylinder at a location about the piston wall.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |