Receptacles – End wall structure – One-piece side and end wall
Patent
1995-05-18
1997-11-11
Pollard, Steven M.
Receptacles
End wall structure
One-piece side and end wall
220607, B23B 328
Patent
active
056854528
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to certain improvements with regard to a bottom intended to form an integrated part of a container, box, basket, barrel, cask or the like made of a polymeric material. The invention also comprises a process for production of a container etc., which container includes such a bottom and which is produced by injection moulding.
Bottoms of plastic containers, boxes, baskets, barrels, casks or the like, when demands on strength and stability are called for, are most often provided with reinforcing means, such as webs, ribs, beams, girders and the like, normally placed on or forming an integrated part of the lower surface of the bottom. These types of reinforcing means give, in relation to obtained degree of reinforcement and rigidity, a large build-up of the container height why adjustments of the number and type of reinforcing means to desired degree of reinforcement, rigidity and/or stability often results in unnecessary high containers related to the loading capacity. Containers reinforced as above are, furthermore, unsuitable or even impossible to use with transport tracks such as ball and roller beds, conveying belts and the like. Containers run an obvious and very high risk of jamming with the tracks or getting caught in each other. Further disadvantages using webs, ribs, beams, girders and the like as above are that such means easily get soiled and are inaccessible to a thorough cleaning.
Reinforcing means, such as webs, ribs, beams, girders and the like can also be placed or constitute an integrated part of the upper surface of a bottom. This does, however, not solve discussed problems, with an exception for the use with transport tracks such as ball and roller beds, conveying belts and the like. The inner loading capacity is reduced unless the height of the container is increased and loaded goods run, during loading, transport and/or emptying, the risk of getting caught in said means. The latter is especially striking when the goods consist of screws, screw nuts, electronic components and other small unwrapped items. The cleaning inaccessibility becomes, furthermore, a more pronounced problem. A clean inner side is of a higher importance than a clean outer side.
Through the present invention a bottom forming an integrated part of plastic containers, boxes, baskets, barrels, casks or the like, without reinforcing means, such as webs, ribs, bees, girders and/or the like has been brought about. The bottom, which complies with high demands for strength and stability, is preferably produced by injection moulding of a polymeric material such as polyethylene or polypropylene. The bottom according to the present invention is characterised in that material thickening and essentially scalloped, jagged and/or wave-like parallel and/or divergent elevations of equal and/or varying width constitute an integrated part of the upper and/or lower surface of the bottom. The height of the material thickening elevations is 0.5-20 mm, preferably 1-5 mm, and the material thickening elevations are separated from each other by square, rectangular, triangular and/or rhomboid intervening spaces. The height of the material thickening elevations represent at least 20% and preferably at most 75%, of the maximum thickness of the bottom.
In one embodiment of the invention, the upper surface and/or the lower surface wholly or partly hold material thickening elevations intersecting in two or more directions, thus forming concave, convex or right angles at the intersections According to preferred embodiments, the material thickening elevations constitute an integrated part of the upper surface while the lower surface of the bottom principally is levelled All material thickening elevations and intervening spaces are, preferably, bevelled and the material thickening elevations can, independently, either be solid and/or wholly or partly include hollow channels.
The process for producing a container, box, basket, barrel, cask or the like, which container comprises a bottom as disclosed above involves injection
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Perstorp AB
Pollard Steven M.
LandOfFree
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