Winches for the control of lifting equipment of the crane, overhead crane or similar type
US4149115A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1977 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Mar 18, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66D1/12
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The invention is an improved control mechanism for winches as used on cranes and similar devices having a single motor driving the shaft of a winch drum through a pair of eddy current clutches. Gear trains attached to the two clutches are operative to drive the drum's shaft in opposite directions. An electronic control generates an output signal indicative of a commanded speed and direction of drum rotation while a tachometer generates a signal indicative of the actual speed and direction of drum rotation. The electronic control system compares the commanded and actual speed as well as the direction of rotation and generates signals energizing the two clutches. The combined action of the two clutches stabilizes the rotational speed of the drum and its direction of rotation in accordance with the commanded input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.