US2368553A - Greaseproof folding box - Google Patents

Description

Jan. 30, 1945. D. LEVKOFF I GREASEPROOF FOLDING BOX Filed June 24, 1942 2 Sheets-Sheet l INVENTOR. 0A W0 LEV/(OFF: BY

@ fflmw A TIORNEYS Jan. 30, 1945. D. LEVKOFF GREASEPROOF FOLDING BOX Filed June 24, 1942 2 Sheets-Sheet 2 INV ENT OR. 5 VAOFF 04 W0 L N ATTORNEYS.

Patented Jan. 30, 1945 2,368,553 GREASEPROOF FOLDING BOX David Levkofl, Brooklyn, N. Y. Application June 24, 1942, Serial No. 448,252 -1 Claim. (Cl. 229-48) This invention relates to improvements in foldlng cardboard boxes, and more specifically to a grease-proof box for the packaging of greasy products.

In the packaging of food products such as butter, lard, bacon, and other greasy products in cardboard boxes, the outer surface of the box becomes soiled, in spite of the grease-proof coating applied to the inner walls of the box. This condition is caused by raw edges of the cardboard material coming in contact with the greasy contents of the box, the said raw exposed edges absorbing the grease which accordingly spreads over the outer surface of the box, thus imparting an unsanitary appearance to the package which causes an otherwise attractive packaged product to lose its sales appeal. It is therefore the main object of this invention to isolate the raw edges of the folding cardboard box from the greasy contents of the box by a novel construction which causes all the raw edges of the box to be disposed exteriorly thereof.

Another feature of the invention is to provide a folding cardboard box having novel infolding reinforced end wall structures having interlock.- ing means for securing the same in closed folded position.

A further feature of the invention is to provide a folding greaseproof-cardboard box which is simple and inexpensive of construction; which may be cut from cardboard stock with a minimum of waste, and which maybe quickly and easily set up for use.

Other novel features of the invention will be come apparent as the followingspecification is read in conjunction with the accompanying drawings, in which:

Figure 1 is a perspective view of the grease- I proof box in closed set up position.

Figure 2 is a perspective view of the top end of the box with the locking flap and one of the wing flaps in opened out position, the dotted lines indicating the position of the wing flap in infolded position.

Figure 3 is a detail perspective view of the end closure construction partially folded.

Figure 4 is an enlarged horizontal sectional view on the line 4-4 of Figure 1.

Figure 5'is an enlarged vertical sectional view on the line 5-5 of Figure 1 with the locking flap in a raised unlocked position.

Figure 6 is an enlarged vertical sectional view on the line 5-5 of Figure 1.

Figure '7 is an end elevational view of the box after glueing and before subsequent folding to set up position.

Figure 8 is a plan view of the blank from which the box is constructed.

Figure 9 is a detail horizontal sectional view embodying the greaseproof seam in a container which is round in cross section.

Referring to the drawings by reference characters. the numeral l0 designates a substantially rectangular blank of cardboard (Figure 8) which is scored and folded in a novel manner to form a box in which all edges of the blank are disposed exterlorly of the box. The inner surface of the blank I0 is provided with a greaseproof and molstureproof coating such as parafflne, or the inner surface may have a lamination of Cellophane or other sheet material having similar characteristics.

The cardboard blank shown in Figure 8 ,is scored vertically on the spaced parallel lines ll, l2, I3, I 4, and I5, reading from left to right, and is scored transversely equi-distantly from the top and bottom edges and parallel thereto on the. score lines lG-IS. The material bounded by the scores Iii-l6 and the top and the respective adjacent bottomedges of the blank form the foldable top and bottom end wall structures A and A respectively, and the remaining material, that is, the material between the scores Iii-i6 form the four side wall panels designated l1, l8, l9, and 20. The material between the score H and adjacent vertical side of the blank constitutes a glue flap 2|, and the material between the score l5 and other vertical edge of the blank constitutes a reenforcing flap panel 22.

In view of the fact that the top and bottom end wall structures A and A are identical in construction a description of one will suflice for the other and like reference characters refer to similar parts. Each end wall structure includes an inner end wall panel C bounded by the scores l6, l2, and I 3 and a score 23 disposed in alinementwith the end edge of the blank and which separates the panel C from an outwardly extending rectangular locking flap 24. The flap 24 has its side edges provided with opposed notches 25 adjacent its outer free end and which notches form locking tongues 26. Disposed at opposite sides of the end wall panel C are folding wing tab panels D and E respectively. The panel D is bounded by the scores ll, I2, l6, and the end edge of the blank. The panel E is bounded by the scores l3, l4, and I6 and end edge of the blank. Each panel D and E is divided into four triangular shaped sections 21, 28, 29, and 30. by

crossed diagonal score lines 3| and 32. The section 2 is further divided by a vertical score 33 extend inwardly from the end edge of the blank and terminating at the intersection of the crossed scores 3! and 32. The section 21 is further divided by a vertical score 33 extending inwardly from the end edge of the blank and terminating at the intersection of the crossed scores 3| and 32. The inner ends of the scores are joined by a" transverse score 3.4 which extends entirely across the panel C to divide it into a top wall section 35 and a bottom wall section 86 and which divides the triangular section 30-30 of the panels D and E into two additional triangular sections 30a and 303. An outer end wall panel F is disposed adjacent the panel E and is bounded by th scores ll, l6, l5, and the end edge of the blank.

After the blank ID has been cut and scored in the manner hereinbefore described, the same is passed through a box folding and giueing machine to first apply glue 31 to the outer surface of-the fold flap panel 22 along the entire length thereof, after which the panel 22 is folded outwardly and inwardly on the score I flat against the side wall panel and outer and inner end wall panels A and B, so that the free side edge of the panel 20 is defined by the fold G and the raw side edge of the fold flap 22 .is disposed exteriorly of the panel wall 20. Glue 38 is applied along the length of the inner side of the glue flap 2| and the blank further folded upon the scores l2 and M, with the flap 2! flatly overlapping the glued foid flap 22. The flap 2! is of less width than the flap 22 so that its raw edge terminates short of the corresponding edge of the flap 22 and thereby forms a fiat stepped seam. The box is now in the flat condition shown in Figure 7, and it leaves the box factory in this condition for compact stacking, shipping, and storing, for the subsequent folding is done at the location of use of the box and which may be accomplished by hand or by suitable box set-up machinery. 7

Assume that, the box is to be set up for use from the flat collapsed position shown in Figure 7. The side wall structure is opened up to dispose the side wall panels !'i--I9 and iii-20 in respective opposed relation, and in view of the fact that the bottom end wall structure A forms the bottom of the box, it is first folded and secured by interlocking means. After the bottom wall is formed, the box is packed with whatever commodity is to be packaged therein, after which, the top end wall structure A is folded closed and held by interlocking means. The end wall struc: tures A and A being identical in construction, the folding of one of them to closed position will suflice for the other in order to avoid a lengthy repetition of description.

. To effect a folding of either end wall structure to closed position, the side wall structure is opened up as previously mentioned, after which the inner end wall panel C is folded inwardly on the score 16. As the panel C swings inwardly, it causes the wing flap panels D and E to fold outwardly on the scores 33 and those portions of the scores 3| and 32 which bound the triangular sections 29. This initial infolding causes the end wall panel C to swing inwardly on the score I6 so that the end wall structure now assumes the position shown in Figure 3. By further pressure upon the section 36, the same is moved to a horizontal position, at which time the end wall section folds cu twardly on the score 34 and is folded flat against the adjacent wall section 33 as illustrated in Figure I. As the section 35 moves to an overlapping position relative to the section 36, the triangular sections 300. fold against the adjacent sections 303 and the outer end wall panel F folds flat against the section 35 of the folded panel C. The folded wing tab panels D and E extend substantially vertically beyond the plane of the side wall panels i1 and i9 respectively, as shown at the left in Figure 2, and said wing tab panels are now folded inwardly over the top wall panel F as shown at the right of Figure 2 in full lines and at the left in dotted lines. When the folded wing tab panels are folded inwardly to th position just described, the triangular sections 28 thereof and the end wall panel F form pockets P, and these pockets respectively receive the tongues 26 by folding the locking flap 24 down over the folded wing panels D and E. Until the locking flap 24 is swung inwardly over the folded wing panels D and E, the folded end wall structure has an inherent tendency to open up, but when the tongues 26 are flexed and inserted into the respective pockets P, the end wall structure is securely held in closed folded position. However, access to the contents of the closed box is easily obtained by withdrawing the tongues 28 from the pockets P and then spreading the several folded panel sections apart.

From the foregoing, it will be noted that no raw cardboard edges of the set up box are disposed inwardly of the box. The glue seam connecting the meeting edges of the side wall structure is provided with the exteriorly folded flap 22 which forms the inner exposed fold edge G. Also, the end closure structure is free of any internal raw edges of the cardboard material, and therefore, the raw edges are not exposed to any greasy or moist contents of the box, for the reason that the panel C when folded upon itself provides an inside fold edge G and which is overlapped by the flat panel E,- the raw edges of which are protected by the folded panel C and infolded wing panels D and E. Thus, the soiling of the box by grease or moisture picked up by raw edges of the greaseproof lined box is prevented when greasy or moist commodities are packaged in the box.

In Figure 9 I have illustrated the greaseproof glue seam embodied in a cardboard container body 40 which is round in cross section. One side edge of the cardboard is folded upon itself as at M and glued together as at 42. The other side edge of the material overlaps the folded portion 4| and is glued thereto as at 43. Thus the greaseproof seam may be provided on a greaseproof lined container of shapes other than square.

If desired, the locking flap panels 24 may be dispensed with and glue labels pasted over the infolded wing flap panels D and E. Also, if desired, the wing flaps D and E may be folded downwardly on the score line Hi to lie flat against the respective side walls I! and i9, and held by an outer wrapper, in which instance the locking flap panel is dispensed with.

While I have shown and described what 1 consider to be the preferred embodiment of my invention for improvements in folding boxes, I wish it to be understood that such changes in design, shapes, and materials as come within the scope of theappended claim may be resorted to githout departing from the spirit of the inven- Having thus described the invention, what I claim as new and desire to ecure by Letters Patent is:

In a container formed from a single rectangu lar blan oi cardboard, said blank being hingescored 0 spaced parallel lines to provide a glue flap on one side edge of the blank, a reentorcing that side wall panel to which it is hlngedly connected, an adhesive bond between the confronting contacting surfaces of the reeni'orcing panel and adjacent the side wall panel, said blank being folded on the remaining hinge scores to position the side wall panel into their respective wall-forming positions, said glue flap overlapping the side wall reeni'orcing panel with the folded edge of the-reeniorcing panel positioned in coinciding relation with the hinge score of the glue flap, and an adhesive bond between the glue flap and that portion of, the reenforcing panel which it overlaps, whereby to provide a flat stepped reentorced seam along the length of the container.

DAVID LEVKOFF.

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