Crane
US6328173A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1999 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | Aug 26, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/76
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A crane having a hydraulically actuated jib system, at least one cylinder for actuating the jib system and an apparatus for monitoring the pressure in the cylinder, which indicates the crane loading, wherein the feed flow of hydraulic fluid to the cylinder is controllable by varying the cross-section of a valve, and a signal is produced in dependence on the variation in pressure in relation to time which is detected in the cylinder or the variation in the loading of the piston guided in the cylinder in relation to time, which signal actuates the drive for adjusting the valve cross-section in the direction of a reduction in the detected variation in pressure or loading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.