Anti-jackknifing apparatus for a semitrailer rig
US4720118A · kind A · utility
Inventors
Key dates
| Filing date | Feb 25, 1987 |
| Grant date | Jan 19, 1988 |
| Priority date | — |
| Expiry date | Feb 25, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D47/025
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In an anti-jackknifing apparatus for a semitrailer rig, upon coupling of a semitrailer to a tractor by insertion of a king pin and a wedge on the trailer into a fifth wheel of the tractor, a pin connected to the wedge traverses a guideway to execute therealong a movement limited and attenuated by double-action hydraulic cylinders connected to hydraulic valve group in turn electrically tied to a control unit. At the guideway, limit switches are provided for setting for each direction of angular motion a predetermined maximum jackknifing angle dependent on vehicle construction. The attenuation of rotary movement between the tractor and the semitrailer is implemented by throttle valves as a function of vehicle speed as measured by a speedometer and as a function of brake pressure as measured by two pressure switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.