Hydraulic circuit for control of lip of vertically storing dock

Details Hydraulic circuit for control of lip of vertically storing dock Hydraulic circuit for control of lip of vertically storing dock

1989-06-30

1990-12-25

Britts, Ramon S.

Bridges

Gangway, ramp, or dock leveler

Attached

14 713, E01D 100

Patent

active

049792539

ABSTRACT:
In a vertically storing dock leveler, more efficient, faster storage is enabled by providing a circuit which causes the lip of the leveler to maintain its position while the leveler platform is being raised. This position retention is in contrast to prior systems, in which raising the platform automatically caused pressure in the hydraulic cylinder controlling lip movement to drop, causing the lip to retract. By maintaining the lip position, lip extension can take less time.

REFERENCES:
patent: 3388413 (1968-06-01), Clarke
patent: 3656199 (1972-04-01), Bregantini
patent: 4343058 (1982-08-01), Loblick
patent: 4383549 (1983-05-01), Maldavs

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