Straddle crane steering system
US4880124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Apr 22, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D7/142
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The invention is suitable for use in a straddle-type crane having a frame and four corners, and comprises a system for the manual resynchronization or automatic synchronous movement of a plurality of pairs of steerable wheels. The pairs of steerable wheels are pivotal relative to the frame. The system comprises a hydraulically-actuated link and tie rod at each corner of the frame to turn all pairs of steerable wheels at each corner of said frame. It further comprises a hydraulic cylinder for each of the hydraulically-actuated links and tie rods, with the hydraulic cylinders being connected to each other in series relationship. The system also comprises a steering orbitrol which directs hydraulic fluid through the series-connected hydraulic cylinders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.