Land vehicles – Wheeled – Extensible
Reexamination Certificate
2006-02-17
2009-06-16
Vanaman, Frank B (Department: 3618)
Land vehicles
Wheeled
Extensible
C280S043200
Reexamination Certificate
active
07547025
ABSTRACT:
A method and apparatus for lowering and raising the floor bed of a transport trailer to facilitate loading and unloading, the transport trailer having at least one pair of wheels mounted on a swing arm, the swing arm connected to a transverse axle, the transverse axle having mounted thereon a first quarter bevel gear in communication with a worm drive gear combination for raising and lowering the swing arms and thus raising or lowering the trailer bed, there being at least one second quarter bevel gear and worm drive gear combination in communication with a motor and a V-shaped yoke, the worm gears being mounted on a common shaft extending from the motor rearwardly to a manual coupling which would permit the manual lowering and raising of the trailer bed in the absence of motor power.
REFERENCES:
patent: 1045120 (1912-11-01), Burroughs
patent: 2262404 (1941-11-01), Pavliska
patent: 2278215 (1942-03-01), Poche
patent: 3544127 (1970-12-01), Dobson
patent: 4077642 (1978-03-01), Clark
patent: 4258560 (1981-03-01), Jessop
patent: 5161814 (1992-11-01), Walker
patent: 5778488 (1998-07-01), Tsai
patent: 7163212 (2007-01-01), Rupp
Frayne Clifford G.
Vanaman Frank B
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