Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1991-12-26
1994-01-04
Dorner, Kenneth J.
Bridges
Gangway, ramp, or dock leveler
Attached
414537, E01D 106
Patent
active
052748677
ABSTRACT:
A hydraulically operated edge-of-dock dock leveler including a deck plate having its rear edge hinged to the dock and an extension lip is hinged to the front edge of the deck plate. In the storage position the deck plate is located in a generally horizontal position and the lip hangs downwardly in a generally vertical pendant position. A hydraulic cylinder unit interconnects the frame of the dock leveler with the deck plate and extension of the cylinder unit acts to move the deck plate to a generally vertical position where a latch that is pivotally connected to the underside of the lip engages an abutment on the frame to lock the deck plate in the vertical position. Retraction of the cylinder unit will pull the deck plate down and the linkage between the deck plate, the lip and the frame enables the outer edge of the lip to move in a generally curved path into engagement with the bed of a carrier. The hydraulic system for operating the cylinder unit includes a valve mechanism and when the cylinder unit is fully extended, as the deck plate is pivoted upwardly, the pressure increase in the hydraulic system shifts the valve and automatically retracts the cylinder unit.
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Connolly Nancy
Dorner Kenneth J.
Kelley Company Inc.
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