Compensating device for a crane hook
US4724970A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1986 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Dec 22, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C13/02
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A compensating device for avoiding swell-generated relative movements between a load suspended on a crane and a load placing surface, or between a crane hook and a load to be carried thereby, the compensating device comprises a hydraulic cylinder-piston unit including a cylinder with an inner space, a piston sealingly displaceable in the cylinder and subdividing the inner space into a load supporting chamber which is to be filled in operation with hydraulic liquid and a second chamber, a piston rod connected with the piston, and a hydraulic accumulator connected with the supporting chamber and accommodating a pretensioned gas cushion, the second chamber being filled in operation with hydraulic liquid, the hydraulic accumulator including at least one hydraulic accumulating element which is connected with the second chamber and accommodating a gas cushion with a low pressure, the piston rod extending through both the load supporting chamber and the second chamber and extending outwardly beyond end surfaces of the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.