Material or article handling – Self-loading or unloading vehicles – Loading or unloading by other carrier or mover means – and...
Reexamination Certificate
2000-02-18
2001-05-22
Werner, Frank E. (Department: 3652)
Material or article handling
Self-loading or unloading vehicles
Loading or unloading by other carrier or mover means, and...
C414S914000, C414S541000, C254S01000C
Reexamination Certificate
active
06234741
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to the field of hoisting devices, and more particularly to an improved form of forklift device adapted to be mounted within the bed of light and medium-sized pickup trucks in such manner that a load may be transferred from ground level into the confines of the truck bed.
Forklift trucks for local use are well known in the art. However, they are not suitable for transporting a pallettized load over a substantial distance prior to unloading. It is also known in the art to provide relatively large trucks with a relatively large hydraulically powered tailgate capable of rotational movement from open to closed position, and in addition, capable of motion in a horizontal plane from ground level to the level of the floor of the truck. These devices do not usually include means to transfer a load from the tailgate into the interior of the truck, a task which often requires more than a single person to complete.
Other devices known in the art include an hydraulically-operated hoist which pivots about a transverse axis disposed medially of the truck frame which is adapted to lift specialized containers containing refuse over the cab of the truck and dump the contents within a storage receptacle disposed rearwardly of the cab.
Such devices are not suitable for use with relatively smaller or medium-sized trucks of relatively limited capacity which are often employed for such tasks as delivering relatively heavy household appliances, such as refrigerators, freezers, stoves, and the like, in which the load must be manually lifted from ground level to the level of the bed of the truck, and subsequently unloaded at the delivery location. In many cases, this operation requires at least two persons of adequate strength. Very often an old appliance is to be removed for disposal, wherein the task is repeated.
SUMMARY OF THE INVENTION
Briefly stated, the invention contemplates the provision of an improved self-contained device which can be more or less permanently installed at the front end of the bed of a relatively smaller pickup truck which is adapted to lift a pallettized load from ground level and transfer the same to a safe position within the bed of a truck for transportation to a desired location for delivery. The maneuvering normally accomplished by a conventional forklift truck is provided by movement of the truck itself which positions the device relative to the load to permit lifting and lowering of the same. In many cases, this operation may be performed by a single person.
REFERENCES:
patent: 3913759 (1975-10-01), Deacon
patent: 3918592 (1975-11-01), Paul
patent: 4509894 (1985-04-01), Rolfe
patent: 4583907 (1986-04-01), Wimberley
patent: 4671729 (1987-06-01), McFarland
patent: 4808056 (1989-02-01), Oshima
patent: 5271707 (1993-12-01), Derksen et al.
Temko Charles E.
Werner Frank E.
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