Power winch for cranes and the like
Abstract
Abstract The payload cable of a crane or the like is reeled in and payed out by a winch drum which is positively driven at all times by a pair of hydraulic motors. When lifting a payload, these two motors are operated in a parallel mode to provide maximum line pull at slower speed. The motors may be operated in the series mode to halve the line pull while the line speed is doubled. This mode of operation is employed to drop the hook ball of the crane rapidly. The winch additionally features a compact planetary gear reduction unit and an intercoacting one-way active clutch and disc brake arrangement for the winch drum shaft. The main shaft bearings are inboard of the clutch and brake housing and the latter components are easily accessible for servicing. A simplified hydraulic control circuit for the winch motors renders the operation of the winch safe, efficient and rapid with out resort to a free-fall mode for the hook ball or free-wheeling of the winch drum.
Inventors
- 👤 R Sterner
- 👤 H Kohler
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |