Material or article handling – Self-loading or unloading vehicles – Loading or unloading by other carrier or mover means – and...
Patent
1981-08-18
1983-09-20
Sheridan, Robert G.
Material or article handling
Self-loading or unloading vehicles
Loading or unloading by other carrier or mover means, and...
414546, B60P 144
Patent
active
044052790
ABSTRACT:
A tailgate loader for a vehicle such as a truck. The loader includes an upper arm and a lower arm, both pivoted at one end to the rear of the vehicle, and both swingable in a vertical plane. The arms are in parallelogram linkage, and a platform is mounted on the short rearward arm of the parallelogram, so that it can swing between a stored position in which it overlies the upper arm, and an extended position in which it projects rearwardly from the upper arm. A hydraulic device is provided for swinging the arms about their pivot locations, and an opener assembly is provided for raising the platform from the stored position to a near-vertical position as the two arms swing downwardly about their pivot locations. The opener assembly includes a first connecting link pivoted at one end to the upper arm at a location spaced a first distance from the other end thereof, and a second connecting link pivoted to one end to the lower arm at a location spaced a second distance from the other end of the lower arm, the second distance being greater than the first distance. The other ends of the first and second connecting links are pivotally connected together to form a knuckle. As the arms are lowered, the knuckle moves away from the upper arm, thus pressing on and moving the platform toward a vertical position, so that the operator need not exert great force to swing the platform to its extended position.
REFERENCES:
patent: 3369678 (1968-02-01), Robinson
patent: 3498481 (1970-03-01), Size
Davy Robert F.
Kremp Wilhelm K.
Davy Robert F.
Sheridan Robert G.
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