Bridging device for docks

Details Bridging device for docks Bridging device for docks

1988-03-11

1989-01-31

Massie, Jerome W.

Bridges

Gangway, ramp, or dock leveler

Attached

14 717, E01D 100

Patent

active

048006041

ABSTRACT:
A bridging device for docks. A lifting cylinder is provided for raising a bridge plate, in which is mounted an extension that can be retracted or extended via a feed cylinder. A hydraulic arrangement is associated with the bridging device, and includes a reversible pump. A relief valve that can be hydraulically closed is provided in the return line from the lifting cylinder. The actuating connection of this relief valve is connected to the feed lines for the feed cylinder.

REFERENCES:
patent: 2881457 (1959-04-01), Rodgers
patent: 3235895 (1966-02-01), Wallace et al.
patent: 4382307 (1983-05-01), Alten

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