Telescoping hydraulic cylinder arrangement for multiple section extensible booms
Abstract
Abstract A PLURALITY OF TELESCOPICALLY ARRANGED HYDRAULIC CYLINDERS HAVING PISTON SURFACES OF SUCCESSIVELY DECREASING CROSS-SECTIONAL AREA ARE UTILIZED TO EXTEND AND RETRACT A MULTIPLE-SECTION, TELESCOPIC STRUCTURE SUCH AS A CRANE BOOM. A CONTINUUS CIRCUIT FOR THE FLOW OF HYDRAULIC FLUID TO AND FROM THE HYDRAULIC CYLINDERS TAKES THE FORM OF INTERCONNECTED ANNULAR PASSAGES PROVIDED BETWEEN ADJACENT, RADIALLY SPACED WALL SEGMENTS OF THE HYDRAULIC CYLINDERS. THE INNERMOST AND SMALLEST DIAMETER HYDRAULIC CYLINDER IS STATIONARY, AND THE OUTERMOST, LARGEST DIAMETER HYDRAULIC CYLINDER MOVES OUTWARDLY FIRST BY HYDRAULIC PRESSURE AND CARRIES WITH IT THE CRANE BOOM SECTION OF SMALLETS CROSS SECTIONAL AREA TO WHICH IT IS CONNECTED. FULL RETRACTION OF THE CRANE BOOM AND HYDRAULIC CYLINDERS TO A VERY COMPACT ASSEMBLY IS PROVIDED BY CONNECTING EACH OF THE SUCCESSIVELY SMALLER HYDRAULIC CYLINDERS TO A BOOM SECTION OF LARGER CROSS SECTONAL AREA, WHEREBY THE SMALLES, MOVABLE HYDRAULIC CYLINDER IS CONNECTED AT ITS INNER END TO THE INNER END OF THE BOOM SECTION OF LARGEST CROSS SECTIONAL AREA.
Inventors
- 👤 Daniel F Przybylski
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |