Counterbalance mechanism for fold out ramp

Details Counterbalance mechanism for fold out ramp Counterbalance mechanism for fold out ramp

2011-03-29

2011-03-29

Hartmann, Gary S (Department: 3671)

Bridges

Gangway, ramp, or dock leveler

Attached

C014S071100

Reexamination Certificate

active

07913343

ABSTRACT:
A ramp assembly includes a ramp portion configured for reciprocating motion between a stowed position, a deployed position, and a neutral position. A counterbalance comprises a shaft and a crank fixedly coupled to the shaft. A rod is rotatably coupled to the crank with an end fitting, and an end stop is slidably coupled to the rod. A compression spring is disposed between the end fitting and the end stop, wherein the compression spring provides a force to bias the ramp portion toward the stowed position when the ramp portion is between the deployed position and the neutral position, and toward the deployed position when the ramp portion is between the stowed position and the neutral position.

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