Hydraulic lift mechanism for camper shells
US5016858A · kind A · utility
Inventor
Key dates
| Filing date | Jan 24, 1989 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Jan 24, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F7/08
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A hydraulic lift mechanism for raising and lowering heavy loads such as a camper shell above the cargo area of a truck includes a generally planar U-shaped lower base frame attachable to the truck and a substantially identical plan-view shape upper load support frame for attachment to the camper shell or other load. Two identical X-shaped scissors jack-like, lifting structures comprised of two crossbeam members pivotably joined to one another at their centers, and pivotably joined at their forward ends to vertically aligned positions in an upper and lower side frame member, are spread apart by a hydraulic powered cylinder pivotably fastened at one end to a side rail of the base frame and pivotably fastened at the other end to a crossarm, to raise the load support platform. A pivotable X-shaped front frame transversely disposed to the side X-frames is vertically disposed between the front frame members of the base frame and the load support frame, the geometry of the front X-frame being such as to assure that the load support frame remains parallel to the base frame in spite of imbalanced loads or imbalanced actuating power delivered by the two hydraulic cylinders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.