Horizontally supported planar surfaces – Industrial platform – Formed from folded semirigid material
Patent
1995-12-27
1998-06-23
Chen, Jose V.
Horizontally supported planar surfaces
Industrial platform
Formed from folded semirigid material
108901, B65D 1900
Patent
active
057690014
DESCRIPTION:
BRIEF SUMMARY
It is the object of the invention to provide a pallet adapted to be manufactured by suction molding which exhibits a high load-carrying capacity, the layers of which despite employment of the suction molding process are firmly interconnected.
This object, in the practice of the invention, is achieved by a pallet comprising a bearing face formed of two layers, with the bearing face being provided with cup-shaped cup-shaped support legs molded on the bottom side of the bearing face and being open toward the same, wherein the bearing face and the cup-shaped support legs are made, by suction molding, of recycling paper, cardboard and/or cellulose fiber waste, it being of decisive importance that provided between the two layers forming the bearing face and the cup-shaped support legs is a reinforced layer equally made of recycling material, with the said reinforced layer being provided with openings distributed across the face, through which upper and lower layer are interconnected by the oppositely directed rough faces.
In this connection, the preferred form of embodiment is the one in which the reinforced layer is a layer formed, by suction molding, of the same material as the upper and lower layers which is provided with openings and molded cup-shaped support legs. Advantageous embodiments reside in that also the walls of the cup-shaped support legs of the reinforced layer are provided with openings, that the material of the reinforced layer is blended with a biologically decomposable binder and reinforcing agent and that the upper and lower layers are provided with transverse and/or longitudinal fins yet to be explained in greater detail hereinafter.
Apart from the preferred form of embodiment of the pallet also other recycling materials can be used for the reinforced layer yet to be explained. However, in this respect it is important for the reinforced layer to be provided with openings through which the upper and lower layers with the oppositely directed rough fibrous faces thereof can be firmly interconnected by felting which process is performed in still wet condition followed by drying.
The present invention is concerned with a load-carrying pallet formed of paper, cardboard and/or cellulose fiber waste.
Dual-layer pallets of the afore-described type are taught, for example, by German Gebrauchsmuster No. 94 13 164 according to which such pallets are manufactured by suction molding. As to the pertinent state of art additional reference is made to the following literature references: German Gebrauchsmuster Nos. 91 00 014 and 73 03 502 and to German Patent No. 29 18 573 C2. Concerning suction molding reference is made to European Patent No. 0 616 076 and to U.S. Pat. No. 867,389.
The individual load-carrying capacity of the pallets according to German Patent No. 29 18 573 C2 and German Gebrauchsmuster Nos. 91 00 014 and 73 03 502, can be left unconsidered. However, the loading capacity of pallets manufactured by suction molding which, basically, is a very advantageous process, is not entirely satisfactory. Admittedly, the pallet according to German Gebrauchsmuster No. 94 13 164 also can be enhanced, for example, by a dual-layer configuration, however, it has proved that the layers cannot be interconnected with adequate firmness. That problem would also be encountered if the molded elements manufactured according to U.S. Pat. No. 867,389 were provided with an intermediate layer enhancing the strength because molded elements produced by suction molding always have one relatively smooth and solid side showing the suction screen structure, and one rough, i.e. fibrous side. It is only the rough sides that can be interconnected with adequate firmness as also taught by U.S. Pat. No. 867,389.
The pallet according to the invention, advantageous embodiments and the manufacture thereof will be described hereinafter in closer detail with reference to the graphical illustration of some forms of embodiments, wherein
FIG. 1 is a longitudinal section taken along line I--I in FIG. 2 through one form of embodiment of the p
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