Steering controlling device for wheel crane
US4995472A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1989 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Nov 17, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D7/1509
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A steering controlling device for a wheel crane wherein a locking operation in a special mode is permitted upon changing over from the special mode to a normal mode and locking and a mode changing over operation can be prevented during normal running of the crane. The device includes front and rear wheel steering cylinders, a mode changing over valve for controlling the cylinders to change over the steering mode, a mode selecting switch, a locking device for locking the rear wheels in the normal mode, a locking switch, a running detecting sensor for detecting a running condition of the crane, a locking change-over controller means responsive to signals from the locking switch and the running detecting sensor for developing a locking or unlocking instruction signal to the locking device when the crane is not in a normal running condition, and a mode change-over controller means responsive to a signal from the running detecting means for forwarding a steering mode selected by the mode selecting switch to the mode changing over valve when the crane is not in a normal running condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.