Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1977-01-12
1978-05-30
Byers, Nile C.
Bridges
Gangway, ramp, or dock leveler
Attached
92181P, 267 65R, E01D 100
Patent
active
040914887
ABSTRACT:
An adjustable dockboard utilizing a gas spring for counterbalancing action. The dockboard includes a ramp hinged at its rear edge to the supporting structure or frame and a lip is hinged to the forward edge of the ramp and is movable between a downwardly hanging pendant position and an extended position. The ramp is counterbalanced to an upwardly inclined position by a gas spring assembly which interconnects the frame and the ramp. The gas spring assembly comprises a closed cylinder-piston structure in which the cylinder contains a gas, such as nitrogen, and a quantity of a liquid, such as oil. When the ramp is in the horizontal position, the piston is retracted in the cylinder and due to the differential in the magnitude of the forces acting on opposite sides of the piston, a biasing action is achieved which urges the piston rod to an extended position and moves the ramp to the upwardly inclined position. Associated with the gas spring assembly is a uni-directional holddown mechanism which prevents extension of the piston rod unless manually released. By incorporating a bleed-through orifice in the piston, a damping action is achieved at the ends of the stroke of the piston. A similar gas spring assembly can also be connected to the lip to assist in moving the lip from the pendant to the extended position.
REFERENCES:
patent: 3137017 (1964-06-01), Pfleger
patent: 3203002 (1965-08-01), McGuire
patent: 3249956 (1966-05-01), Zajac
patent: 3345665 (1967-10-01), Anderson
patent: 3388413 (1968-06-01), Clarke
patent: 3415159 (1968-12-01), Hornlein
patent: 3646627 (1972-03-01), Potter
patent: 3835497 (1974-09-01), Smith
patent: 3963225 (1976-06-01), Nicholls
patent: 3966182 (1976-06-01), Stadelmann
patent: 4014059 (1977-03-01), Artzberger
Byers Nile C.
Kelley Company Inc.
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