Dockboard with a tread plate lock mechanism
US4662021A · kind A · utility
Inventors
Key dates
| Filing date | Jun 25, 1984 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Jun 25, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65G69/2829
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An independent dockboard of the type adapted to be mounted in a pit in a loading dock, the dockboard including a main frame, a ramp pivotally mounted on the frame and including a tread plate assembly mounted for telescopic movement into and out of the ramp, the tread plate assembly including a tread plate mounted on a frame with a number of wheels for supporting the assembly for movement on the ramp, the tread plate assembly being pivoted about the axis of the wheels, a lift frame pivotally mounted on the main frame and operatively positioned to engage the ramp, a hydraulic piston and cylinder assembly operatively engaging the left frame and a second hydraulic piston and cylinder assembly operatively connected to move the tread plate assembly into and out of the ramp, and an over center toggle link assembly to lock the tread plate against the ramp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.