Material or article handling – Elevator or hoist and loading or unloading means therefor – Convertible attachment
Patent
1990-01-03
1991-06-11
Bucci, David A.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Convertible attachment
414661, B66F 912, B23Q 700
Patent
active
050228110
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an assembly that is useful in industrial premises for conveying heavy objects such as press tools, workpieces and the like, for facilitating the movement of the objects from one to another of a number of supports such as a loading stool, a shelf or a table in a press or other machine tool.
The invention relates more particularly to the known type of such assemblies that comprises a unit which is arranged to be placed on the fork or a forklift truck and which, when placed on the fork, forms a sliding surface that extends in the longitudinal direction of the fork tines, for carrying the objects, and which unit comprises an operating mechanism designed to be able to pull onto the sliding surface an object situated on a first supporting surface that is level with the sliding surface, to slide the object along the sliding surface towards its inner end to a conveying position and, in the opposite direction, to push the object from the conveying position, sliding along the surface and past its outer end onto a second supporting surface which also, upon adjustment in height of the fork, is level with the sliding surface.
BACKGROUND OF THE INVENTION
In a commercially available assembly of this type the operating mechanism consists of two parallel, electrically driven ball screws which have their ball nuts connected to a toggle on the top side of the sliding surface. The toggle consists of a couple of links which can operate in two different relative positions, of which one, when the links are pulled together and stand at an angle to the sliding surface, can be used when, for example, a press tool is moved while it is resting on the sliding surface, while the second relative position, when the toggle is adjusted so that the links are in line with each other and with the sliding surface and thus can reach outside the sliding surface, is the one which has to be used for the tool to be transferred from the sliding surface to a press table or other support, just as when transferring in the opposite direction onto the sliding surface.
With each such transfer of large and heavy objects from or to a support the toggle has to be adjusted between these two working positions, and this adjustment requires that the ball screws operate while the object is lying still on the sliding surface. This discontinuous working manner delays and complicates the handling of the objects. Also, because of the design of the operating mechanism, the assembly is unnecessarily expensive.
It is also previously known to incorporate, in a forklift truck, a hydraulic-mechanical operating mechanism for handling press tools and the like. The forklift truck is made specially for the purpose and so cannot be used generally as a goods and transport vehicle. It therefore remains unused throughout the period which elapses in a plant between tool changes and similar operations that can be carried out with the truck. In addition to the fact that it is uneconomical, this forklift truck has the disadvantage that its operating mechanism operates hydraulically, i.e. it does not permit handling of heavy objects, such as are found in the engineering industry, of 1 meter or more.
SUMMARY OF THE INVENTION
The aim of the invention is to make use of the great transport economy advantages which lie in an accessory for use in moving objects in an industrial plant by means of a forklift truck, constituting a unit which can be placed on the forklift truck at the times when such movement is to be carried out, but which, in the interim, can be kept separate from the forklift truck so that the truck can be used for other conveying work arising in the industrial plant. The invention seeks to incorporate this advantage into an assembly suitable for this purpose which, as an accessory to a forklift truck, is made up of simple mechanical components, is easy and inexpensive to manufacture, and is simple to operate.
At the same time the invention seeks to eliminate the disadvantages which are found in the above mentione
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