Winch with compact, high efficiency and high ratio gearing suitable for free fall
US4328954A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1979 |
| Grant date | May 11, 1982 |
| Priority date | — |
| Expiry date | May 7, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66D1/22
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The drum of a winch suitable for cranes is driven by gearing compactly arranged within the drum, leaving room also for a free fall dog clutch when desired. The gearing is of the compound planetary type which can provide very high ratios with low friction. The low friction yields greater efficiency, and permits retaining the gearing in operation idly during free fall, ready for fail-safe braking using it. A separate brake is provided for stopping free fall, when free fall is provided. The winch motor is preferably of the two unit type, with valving for two speeds. Operation of either manual valve (normal operation or free fall) from its neutral position neutralizes the other. Numerous automatic valves are included in a valving block, providing simplicity of piping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.