Steering system for automotive vehicle
US4638883A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1985 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Jun 24, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D7/142
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A steering device for an automotive vehicle includes steering wheels one of which is associated with a driver's seat positioned at the front of the vehicle and the other with a seat positioned at the rear of the vehicle and available for manipulating a crane or the like. Power cylinders are provided for hydraulically steering front wheels only or both of front wheels and rear wheels of the vehicle. Hydraulic circuits associated with the power cylinders are controlled such that while the wheels are steered at the driver's seat, they cannot be steered at the craneman's seat. Such control of the hydraulic circuits occurs in response to actuation of a key switch. A four-wheel steering mode for steering the front and rear wheels at the same time is prevened from replacing a two-wheel steering mode for steering front wheels only, unless the vehicle runs at low speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.