US3136221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocatory telescoping-piston hydraulic motor
Assignee: Phil Wood Industries Ltd
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Filing: 1961-10-27
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Granted: 1964-06-09
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Expires: 1981-10-27
Abstract
No abstract record available.
Inventors
- 👤 Ronald E Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:59
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A RECIPROCATORY TELESCOPING-PISTON HYDRAULIC MOTOR COMPRISING A CYLINDER, A PLURALITY OF HOLLOW HYDRAULIC PISTON OF SUCCESSIVELY-DECREASING DIAMETERS MOUNTED WITHIN SAID CYLINDER IN COAXIAL TELESCOPING RELATIONSHIP FOR EXTENSION DURING THEIR FORWARD STROKES AND RETRACTION DURING THEIR RETURN STROKES, THE OUTERMOST PISTON HAVING A TUBULAR PISTON ROD AND A PISTON HEAD THEREON RECIPROCABLY MOUNTED IN SAID CYLINDER AND THE REMAINING PISTONS HAVING TUBULAR PISTON RODS AND PISTON HEADS THEREON RECIPROCABLY MOUNTED IN THE TUBULAR PISTON RODS OF THE NEXT LARGER DIAMETER PISTON, MEANS FOR SUPPLYING HYDRAULIC PRESSURE FLUID TO SAID CYLINDER AND PISTONS ON ONE SIDE OF SAID PISTON HEADS AND EXHAUSTING PRESSURE FLUID FROM THE OPPOSITE SIDE THEREOF, AND MEANS INCLUDING COOPERATING ELEMENTS DISPOSED ADJACENT ONE ANOTHER ON SAID INNERMOST PISTON AND PISTON IMMEDIATELY ADJACENT THERETO FOR RELEASING HYDRAULIC PRESSURE FLUID AND EFFECTING RETARDATION OF SAID PISTONS IN RESPONSE TO THE ARRIVAL OF SAID PISTONS AT PREDETERMINED FLUIDRELEASING LOCATIONS NEAR THE ENDS OF THEIR FORWARD STROKES.
Claim 2
Dependent Claim
155 words
A RECIPROCATORY TELESCOPING-PISTON HYDRAULIC MOTOR COMPRISING A CYLINDER, A PLURALITY OF HOLLOW HYDRAULIC PISTON OF SUCCESSIVELY-DECREASING DIAMETERS MOUNTED WITHIN SAID CYLINDER IN COAXIAL TELESCOPING RELATIONSHIP FOR EXTENSION DURING THEIR FORWARD STROKES AND RETRACTION DURING THEIR RETURN STROKES, THE OUTERMOST PISTON HAVING A TUBULAR PISTON ROD AND A PISTON HEAD THEREON RECIPROCABLY MOUNTED IN SAID CYLINDER AND THE REMAINING PISTONS HAVING TUBULAR PISTON RODS AND PISTON HEADS THEREON RECIPROCABLY MOUNTED IN THE TUBULAR PISTON RODS OF THE NEXT LARGER DIAMETER PISTON, MEANS FOR SUPPLYING HYDRAULIC PRESSURE FLUID TO SAID CYLINDER AND PISTONS ON ONE SIDE OF SAID PISTON HEADS AND EXHAUSTING PRESSURE FLUID FROM THE OPPOSITE SIDE THEREOF, AND MEANS INCLUDING COOPERATING ELEMENTS DISPOSED ADJACENT ONE ANOTHER ON SAID INNERMOST PISTON AND PISTON IMMEDIATELY ADJACENT THERETO FOR RELEASING HYDRAULIC PRESSURE FLUID AND EFFECTING RETARDATION OF SAID PISTONS IN RESPONSE TO THE ARRIVAL OF SAID PISTONS AT PREDETERMINED FLUIDRELEASING LOCATIONS NEAR THE ENDS OF THEIR FORWARD STROKES.
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |