One handle sequence selecting valving for crowd cylinders
Abstract
Abstract IN CONNECTION WITH A THREE PART CRANE BOOM HAVING A LIGHTER FORWARD TELESCOPIC BOOM SECTION AND A HEAVIER REARWARD TELESCOPIC BOOM SECTION CONTROLLED BY SEPARATE CROWD CYLINDERS, THE ACTION IS SELECTIVELY CONTROLLED MANUALLY BY A SINGLE HANDLE CONNECTED TO THE VALVES BY A PREFERENCE LINKAGE. MOVING THE HANDLE TO ITS LIMIT IN EITHER DIRECTION WILL EITHER EXTEND OR RETRACTE BOTH CYLINDERS SIMULTANEOUSLY. MOVING THE HANDLE HALF-WAY IN THE CROWD DIRECTION WILL EXTEND ONLY THE CYLINDER FOR THE LARGER INTERMEDIATE SECTION. MOVING THE HANDLE HALFWAY IN THE RETRACTING DIRECTION WILL RETRACT ONLY THE SMALLER FORWARD SECTION. THE PREFERENCE LINKAGE PREVENTS THE WRONG SEQUENCING, I.E., HAVING THE LIGHTER FORWARD BOOM SECTION EXTENDED OUT FROM THE HEAVIER SECTION FIRST, OR MORE THAN THE HEAVIER SECTION IS EXTENDED OUT FROM THE STILL HEAVIER BASE SECTION.
Inventors
- 👤 William J Lado
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |