Hydraulic dockboard system

Details Hydraulic dockboard system Hydraulic dockboard system

1977-01-12

1978-04-04

Byers, Nile C.

Bridges

Gangway, ramp, or dock leveler

Attached

E01D 100

Patent

active

040818748

ABSTRACT:
A hydraulic operating system for a series of dockboards mounted on a loading dock. Each dockboard includes a hydraulic cylinder unit that is employed to elevate the ramp, and a single hydraulic pump unit is utilized for the series of dockboards. A discharge line is connected to the outlet of the pump unit, while a return line connects the inlet of the pump to a reservoir, and individual supply lines are connected to the hydraulic cylinder units of each dockboard. A multiple position valve interconnects the discharge line, the return line and the supply lines and is operable to selectively direct hydraulic fluid through the discharge line to at least one of said supply lines to operate the corresponding cylinder unit and elevate the ramp of that dockboard, and for simultaneously connecting the other supply lines to the return line.

REFERENCES:
patent: 2560064 (1951-07-01), Astry
patent: 2714735 (1955-08-01), Watson
patent: 2774492 (1956-12-01), Harrison
patent: 2881457 (1959-04-01), Rodgers
patent: 2993219 (1961-07-01), Pennington
patent: 3175238 (1965-03-01), Pennington
patent: 3201814 (1965-08-01), Le Clear
patent: 3290710 (1966-12-01), Whitenack

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