Multi-stage trolley for a crane and a crane therewith
US8708172B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2010 |
| Grant date | Apr 29, 2014 |
| Priority date | — |
| Expiry date | May 24, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C19/002
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A crane for loading and unloading a cargo includes multi-stage trolley. The multi-stage trolley for a crane includes a first trolley movable in a longitudinal direction along a boom of the crane; a second trolley movable in a lateral direction on the first trolley; a hoisting wire provided in the longitudinal direction along the boom; a spreader connected to the hoisting wire through the first trolley and the second trolley and supported by the hoisting wire, the spreader being movable in a vertical direction according to a movement of the hoisting wire. The multi-stage trolley further includes a sheave block unit for changing a direction of the hoisting wire to maintain a vertical level of the spreader constant when the first trolley and/or the second trolley is moved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.