US3172338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydropneumatic actuator
Assignee: SANDEX Inc
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Filing: 1963-05-27
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Granted: 1965-03-09
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Expires: 1983-05-27
Abstract
No abstract record available.
Inventors
- 👤 Ackerman Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:08
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B11/076; F15B2211/00; F15B2211/40; F15B2211/405; F15B2211/40576; F15B2211/40584; F15B2211/415; F15B2211/41527; F15B2211/41536; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7055; F15B2211/72; F15B2211/80; F15B2211/885; F15B2211/8855
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
277 words
A HYDROPNEUMATIC ACTUATOR COMPRISING: (A) A FIRST CYLINDER, (B) A FLUID ACTUABLE FIRST PISTON IN AND RECIPROCABLE RELATIVE TO SAID FIRST CYLINDER AND SUBDIVIDING SAID FIRST CYLINDER INTO TWO CHAMBERS, (C) A SECOND CYLINDER, (D) A LIQUID CHECKING SECOND PISTON IN AND RECIPROCABLE RELATIVE TO SAID SECOND CYLINDER AND SUBDIVIDING SAID SECOND CYLINDER INTO TWO CHAMBERS, (E) A THIRD CYLINDER, (F) A RESERVOIR PISTON IN AND RECIPROCABLE RELATIVE TO SAID THIRD PISTON AND SUBDIVIDING SAID THIRD CYLINDER INTO TWO CHAMBERS, (G) SAID THREE CYLINDERS BEING CONCENTRIC AND AT LEAST PARTIALLY MUTUALLY OVERLAPPING, (H) MEANS INTERCONNECTING THE FIRST AND SECOND CYLINDERS AND PISTONS SO THAT THE POSITION OF THE SECOND PISTON RELATIVE TO THE SECOND CYLINDER IS A FUNCTION OF THE POSITION OF THE FIRST PISTON RELATIVE TO THE FIRST CYLINDER, (I) MEANS TO SUPPLY A FLUID UNDER PRESSURE ALTERNATELY TO THE TWO CHAMBERS OF THE FIRST CYLINDER TO DRIVE THE FIRST PISTON RELATIVE TO THE FIRST CYLINDER ALTERNATELY IN OPPOSITE DIRECTIONS, (J) A CLOSED CIRCUIT WITH A LOW FRICTION HEAD INTERCONNECTING THE TWO CHAMBERS OF THE SECOND CYLINDER, (K) MEANS PROVIDING AN ALTERNATE CIRCUIT WITH A HIGH FRICTION HEAD CONNECTING THE TWO CHAMBERS OF THE SECOND CYLINDERS, (L) A LIQUID FILLING THE TWO CHAMBERS OF THE SECOND CYLINDER AND BOTH CIRCUITS, (M) VALVE MEANS TO SELECTIVELY RENDER ONLY ONE OF SAID CIRCUITS EFFECTIVE TO CONTROL THE RATE OF MOVEMENT OF THE FIRST PISTON RELATIVE TO THE FIRST CYLINDER, (N) ONE OF THE CHAMBERS OF THE THIRD CYLINDER CONSTITUTING A RESERVOIR, (O) SAID RESERVOIR BEING FILLED WITH LIQUID, (P) AND A LIQUID FILLED PATH CONNECTING THE RESERVOIR TO AT LEAST ONE OF THE CHAMBERS OF THE SECOND CYLINDER.
Claim 2
Dependent Claim
277 words
A HYDROPNEUMATIC ACTUATOR COMPRISING: (A) A FIRST CYLINDER, (B) A FLUID ACTUABLE FIRST PISTON IN AND RECIPROCABLE RELATIVE TO SAID FIRST CYLINDER AND SUBDIVIDING SAID FIRST CYLINDER INTO TWO CHAMBERS, (C) A SECOND CYLINDER, (D) A LIQUID CHECKING SECOND PISTON IN AND RECIPROCABLE RELATIVE TO SAID SECOND CYLINDER AND SUBDIVIDING SAID SECOND CYLINDER INTO TWO CHAMBERS, (E) A THIRD CYLINDER, (F) A RESERVOIR PISTON IN AND RECIPROCABLE RELATIVE TO SAID THIRD PISTON AND SUBDIVIDING SAID THIRD CYLINDER INTO TWO CHAMBERS, (G) SAID THREE CYLINDERS BEING CONCENTRIC AND AT LEAST PARTIALLY MUTUALLY OVERLAPPING, (H) MEANS INTERCONNECTING THE FIRST AND SECOND CYLINDERS AND PISTONS SO THAT THE POSITION OF THE SECOND PISTON RELATIVE TO THE SECOND CYLINDER IS A FUNCTION OF THE POSITION OF THE FIRST PISTON RELATIVE TO THE FIRST CYLINDER, (I) MEANS TO SUPPLY A FLUID UNDER PRESSURE ALTERNATELY TO THE TWO CHAMBERS OF THE FIRST CYLINDER TO DRIVE THE FIRST PISTON RELATIVE TO THE FIRST CYLINDER ALTERNATELY IN OPPOSITE DIRECTIONS, (J) A CLOSED CIRCUIT WITH A LOW FRICTION HEAD INTERCONNECTING THE TWO CHAMBERS OF THE SECOND CYLINDER, (K) MEANS PROVIDING AN ALTERNATE CIRCUIT WITH A HIGH FRICTION HEAD CONNECTING THE TWO CHAMBERS OF THE SECOND CYLINDERS, (L) A LIQUID FILLING THE TWO CHAMBERS OF THE SECOND CYLINDER AND BOTH CIRCUITS, (M) VALVE MEANS TO SELECTIVELY RENDER ONLY ONE OF SAID CIRCUITS EFFECTIVE TO CONTROL THE RATE OF MOVEMENT OF THE FIRST PISTON RELATIVE TO THE FIRST CYLINDER, (N) ONE OF THE CHAMBERS OF THE THIRD CYLINDER CONSTITUTING A RESERVOIR, (O) SAID RESERVOIR BEING FILLED WITH LIQUID, (P) AND A LIQUID FILLED PATH CONNECTING THE RESERVOIR TO AT LEAST ONE OF THE CHAMBERS OF THE SECOND CYLINDER.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |