Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1998-06-09
2000-05-23
Lisehora, James A.
Bridges
Gangway, ramp, or dock leveler
Attached
E01D 100
Patent
active
060651725
ABSTRACT:
A hydraulic control circuit for a dock leveler which includes a deck pivotable between stored and raised positions and a lip pivoted to the deck for movement between pendant and extended positions is disclosed. The hydraulic control circuit, includes a deck cylinder couplable to the deck for controlling motion of the deck, a lip cylinder couplable to the lip for controlling motion of the lip, a pump for providing a source of pressurized fluid to the deck and lip cylinders, and an operator-actuated switch for selectively directing the pressurized hydraulic fluid to one of the deck cylinders and the lip cylinder.
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Declaration of Michael A. Swessel describing hydraulic control circuit installed in 1983.
Lisehora James A.
Rite-Hite Holding Corporation
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