Dockboard with a tread plate lock mechanism

Details Dockboard with a tread plate lock mechanism Dockboard with a tread plate lock mechanism

1984-06-25

1987-05-05

Leppink, James A.

Bridges

Gangway, ramp, or dock leveler

Attached

14 717, E01D 100

Patent

active

046620214

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.

REFERENCES:
patent: 2567436 (1951-09-01), Lampe
patent: 2993219 (1961-07-01), Pennington
patent: 3175238 (1965-03-01), Pennington
patent: 3201813 (1965-08-01), Le Clear
patent: 3235896 (1966-02-01), Riggs
patent: 3268932 (1966-08-01), Hartman
patent: 3728753 (1973-04-01), Beckwith et al.
patent: 3835497 (1974-09-01), Smith
patent: 3967337 (1976-07-01), Artzberger
patent: 4047258 (1977-09-01), Burnham
patent: 4224709 (1980-09-01), Alten
patent: 4455703 (1984-06-01), Fromme et al.

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