Automatic return to dock mechanism

Details Automatic return to dock mechanism Automatic return to dock mechanism

1995-01-11

1996-06-18

Bagnell, David J.

Bridges

Gangway, ramp, or dock leveler

Attached

14 717, E01D 100, E01F 100

Patent

active

055265456

ABSTRACT:
A dock leveler comprising having a deck pivotally mounted for movement between a stored generally horizontal position and an operative position. A lip assembly is pivotally attached to one end of the deck and has a lip movable between an extended operative position and a stored pendant position. The deck is movable by hydraulic cylinder. A switch is mounted to the underside of the deck and to produce an output to control movement of the deck. A sensor arm is operably coupled to the lip assembly for limited movement relative to lip assembly movement. The sensor arm has one end positioned relative to the switch to cause the switch to produce a signal that starts operation of the hydraulic cylinder to move the deck thereby raising the deck and allowing said lip to fall. As the lip falls the one end of said sensor arm moves away from the switch such that the output thereof terminates operation of the hydraulic cylinder thus allowing the lip to fully retract prior to lowering of the deck.

REFERENCES:
patent: 4365374 (1982-12-01), Bennett
patent: 4827549 (1989-05-01), Walker
patent: 4944062 (1990-07-01), Walker
patent: 5205010 (1993-04-01), Hageman
patent: 5392481 (1995-02-01), Hageman
patent: 5416941 (1995-05-01), Hageman

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