Variable lip throw-out for dockboard
US4937906A · kind A · utility
25Cited by
2References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1989 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Jun 1, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65G69/2841
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A dockleveler employs a lip counterbalance mechanism to increase the force of the lip counterbalance spring as the deck is raised. A linkage is coupled at one end to the dockboard lip and at the other end to a level assembly. The lever in turn is adjustably coupled to the lip spring. As the dockboard is raised, a chain coupled to the frame and the linkage exerts a force causing initial raising of the lip while pivoting the linkage downward. This in turn causes the lever to rotate such that the force on the lever pushes the linkage further raising the lip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.