Grappler sway stabilizing system for a gantry crane
US6021911A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1998 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Mar 2, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C13/06
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A sway stabilizing system is provided for stabilizing sway of a grappler suspended by vertically movable hoisting cables on a gantry crane. The crane is a type which is particularly useful for lifting a standard container from a standard-height chassis, such as a standard road trailer. According to the invention, the system is designed to optimally dampen sway when the grappler is slightly higher than the top of a standard container resting on a standard chassis. More particularly, in order to cancel pendulum sway effect, the sway stabilizing system provides first and second anti-sway cables which are operably guided from the grappler to an overhead trolley of the crane in a longitudinally diagonal manner. The anti-sway cables are acted upon by respective hydraulic cylinder assemblies mounted on the grappler to apply appropriate tension in the respective anti-sway cables. The cylinder assemblies act in opposite directions to dampen grappler sway in both directions along a longitudinal axis. So that the length of the anti-sway cables is adjusted accordingly with the vertical lifting movement of the grappler, the hoisting cables and anti-sway cables are paid out by respective rotatab…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.