Winch drag brake apparatus
US4746100A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1986 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Dec 24, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D59/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In order to overcome the disadvantage of overspinning of a winch drum when a disconnect device adjacent the drum is disengaged, a drag brake apparatus is provided for limitedly restricting the rotation of the drum when an actuator having a braking element is continually urged against the drum by a spring. A control mechanism includes a control lever assembly movable to operate a hydraulic valve assembly for the primary control of the winch drum, and movable to operate an associated valve for controllably directing pressurized fluid to the actuator for supplementing the spring force. Thus, a first drag brake mode can be attained for substantially freespool operation of the drum, and a second drag brake mode can be attained for controlled load dropping operation of the drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.