Self-loading piggyback-type trailer unit
US5494309A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1994 |
| Grant date | Feb 27, 1996 |
| Priority date | — |
| Expiry date | Jun 30, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60P3/07
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A trailer unit includes a front trailer section and a rear trailer section disposed in an aligned end-to-end relationship with a lift arm being pivotally connected at opposite ends thereof to the front and rear trailer sections. The rear trailer section includes a series of ground engaging wheels, whereas the front trailer section, when hitched to the tractor truck, is simply supported by the tractor truck's conventional fifth wheel. The trailer unit is adapted to be rigged to a conventional tractor truck with no important modifications having to be made thereto. Hydraulic cylinders are pivotally mounted at their cylinder ends to rear of the front trailer section and at their piston ends to the front end of the lift arm. When the cylinders are extended, a rear end of the lift arm is gradually pivoted upward and forward, whereby lifting the front end of the rear trailer section and carrying the same gradually onto the front trailer section. In the collapsed position of the trailer unit, the rear trailer section sits basically on the front trailer section while being also supported by the elevated lift arm with the weight of the rear trailer section being substantially centered over …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.