Envelopes – wrappers – and paperboard boxes – Paperboard box – A sidewall includes a folded lateral extension of an...
Patent
1993-05-13
1995-05-16
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
A sidewall includes a folded lateral extension of an...
229918, 229919, 493128, 493168, 493419, 493460, B65D 542
Patent
active
054153450
DESCRIPTION:
BRIEF SUMMARY
This invention relates to boxes especially for the transport of food and in particular relates to a method of reinforcing the corners of such boxes.
Boxes for the transport of food such as fresh vegetables and fruits often comprise relatively shallow rectangular box portions having raised opposite end portions. FIG. 5 of the accompanying drawings illustrates one such general design. The raised end portions allow several boxes to be stacked one on top of the other without damage to the contents while access of air and the ability for visual inspection are not impaired with presentation being improved.
Many boxes of this type are produced from wood, but this material is not currently favoured for a number of reasons. Boxes of this type may also be produced from cardboard, a material whose strength is limited, and thus the height to which a stack of boxes can be made is limited if the lowermost boxes are not to be crushed.
The invention seeks to provide a method of reinforcing boxes which reduces or overcomes the above problem.
According to the present invention there is provided a method of making a box having a reinforced corner which comprises folding the box from a prescored sheet of material characterised in that adjacent each corner a flap of scored material is present which is deformed into an approximately cylindrical shape and secured whereby to provide reinforcement for the corner.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which:
FIGS. 1 to 4 illustrate the production of the reinforced corner;
FIG. 5 is a diagramatic general perspective view of a suitable form of box;
FIG. 6 is a view of a blank from which the box of FIG. 5 may be made; and
FIG. 7 is a detail of one corner of the box of the present invention.
Referring to the drawings, FIG. 5 illustrates a form of box often used for the transport of food, for example cauliflowers or peaches. The box, generally designated 10, comprises a base 12 generally rectangular in shape having longitudinal sides 14 and transverse ends 16. As illustrated the sides 14 are not as high as the ends 16 but this a matter of choice, since the sides 14 can be made to be as high as the ends 16. The shape illustrated allows air freely to circulate even when bores are stacked. As can be seen from FIG. 5 the ends 16 have overlapping top 18 and side 20 portions and the portions 20 are affixed to the sides 14 for example at sealing points 22. The "platforms" formed by the top portions 18 enable boxes to be stacked one on top of the other without damage to the contents.
The box 5 may be produced from a creased and cut blank 24 as illustrated in FIG. 6. As can be seen from FIG. 6 and 7 the blank has portions 26 which are in part supernumerary in that the box could still be formed if these portions were not there.
In accordance with the invention these portions 26 are formed (as can be seen better from FIGS. 1a and 1b) with a plurality of vertical score or crease lines 28 together with an uncreased portion 30. Once the box has been formed to the stage illustrated in FIG. 7, a pushing device 32 contacts the plain portion 30 of the flap 26 and pushes it to the left as illustrated in FIGS. 1 to 4 causing it to buckle progressively until it reaches the cylindrical shape illustrated in FIG. 4. At this point the plain portions 30, the flaps 20 and the sides 14 may be affixed e.g. glued, stapled or the like, to the remainder of the box therby stabilising the cylinder and securing the box, preferably in one operation. As can be seen from FIG. 4 the cylinder need not be geometrically exact in order to perform its function.
The net result is that each corner of the box is reinforced by the presence of the cylindrically folded flap 26 without using any additional material increasing the weight of the box since the flap 26 is produced from the same blank 24 which made the box as illustrated in FIG. 5. However, in use, the presence of the cylinder considerably increases the stiffness and crush resistance of the whole box and m
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patent: 3978774 (1976-09-01), Royal
patent: 4174658 (1979-11-01), Graham
patent: 4581005 (1986-04-01), Moen
patent: 4613045 (1986-09-01), Watson
patent: 5285956 (1994-02-01), Piepho
Elkins Gary E.
FRA.MO. Snc Di Franca Riva & C
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