Dock leveler with cam assisted lip extension

Details Dock leveler with cam assisted lip extension Dock leveler with cam assisted lip extension

1997-02-18

1998-11-10

Graysay, Tamara L.

Bridges

Gangway, ramp, or dock leveler

Attached

14 713, E01D 100

Patent

active

058325549

ABSTRACT:
A dock leveler, typically powered by an electric actuator or other motive source has a frame and a deck pivotally mounted to the frame. The source of power to move the deck is coupled to the underside of the deck. An extendable lip is pivotally mounted to one end of the deck and an arm assembly is coupled at one end to the lip and at another end to a crank carried by the deck to utilize movement of the deck to raise said lip into an extended position. A cam-latch arm is resiliently coupled to the arm assembly and selectively bearing on the crank by means of a spring coupling to the arm assembly. A linkage is coupled between the frame and said cam-latch arm to urge said cam-latch arm into contact with the crank as the deck is raised. This tends to cause movement between the cam portion and a roller on the crank which in turn provides a component of force to assist in raising said lip into the extended position.

REFERENCES:
patent: Re30104 (1979-10-01), Burnham
patent: Re30250 (1980-04-01), Catlett
patent: 3500486 (1970-03-01), LeClear
patent: 4097949 (1978-07-01), Barrett
patent: 4937906 (1990-07-01), Alexander
patent: 5450643 (1995-09-01), Warner
patent: 5553343 (1996-09-01), Alexander

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