US1775027A - Carton - Google Patents

Description

Sept. 2, 1930. c. w. HARTMANN CARTON Filed Deo. 20,'1927 2 Sheets-Sheet l [vn/EN mfc CA/L W. HAR TMA/wu Per.

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Sept. 2, 1930. c. W. HARTMANN 1,775,027

CARTON Filed Dec. 2o, 1927 2 sheets-sheer 2 lNvaNToQ AvvoQNEvs Patented Sept. 2, 1930 UNITED STATES PATENT oFFlcs CARTON Application med December 20, 1927, Serial No. 241,351, and in Great Britain January 17, 1927.

My invention relates to improvements in boxes or cartons and refers more particularly to improvements/in existing type of box or carton usually formed of cardboard and prol vided with a paper or other lining secured to the material of the box or carton at certain places and free at others so that when the ends or flaps of the box or carton are folded over to effect a closure, the paper lining will also be-automatically folded so as to efectively seal the contents of the box. Hitherto it has not been found practical to successfully manufacture cartons of this type unless' the shapeof the cartons be restricted so that its cross section is a rectangle,

the dimension of whose sides are in the approximate proportion of two to one.

Now it is highly desirable that boxes of this type should be of a square' or substanv 9 tially square section since they are largely used for packing goods filled into the box by automatic machines and the majority of such machines are arranged for use with packages of a square section. I On the other hand in some cases flat boxes are preferred, i. e. rectangular boxes,-whose dimensions in one direction are small compared to the dimensions in the other direction and which need not necessarily be of any definite roportion to one another.

\ The o ject of this invention is to enable rectangular boxes of this type to be' made of s uare or substantially square section anda so of a shape having sides of any other convenient dimensions or proportions, or rectangular boxes of any desired iiatness.

According to my invention the linin is shaped at its ends 1n such manner that w en it is appliedl by a suitable adhesive to the blank com rising the carton the parts of the lining app ied to two of the sides of the carton which will oppose or will be 4 arallel to each other when theI carton is fol'lded have their end edges extending beyond the end edges of the parts of the lining applied to the other two sides of the carton. This can be eiected by not as heretofore has been the practice simply forming each end of the lin- 1ng with a straight edge but by forming each end of the liningwith an edge containing two substantially trapezoidal cut-away or bay portions interrupting the straight continuityl of the end edge of the lining. i

The lining is attached to the inner flaps all round the edges While its attachment to the outer flaps is along a substantially trapezoidal-shape'd outline symmetrical to that of the cut.

In blanks for producing square-shaped boxes the said substantially rectangular cuts serve to reduce the heights of the inner flaps, so that these flaps and the parts .of the lining completely coating them onlypoverlap each other to a suitable extent but do not cover each other entirely. The outer flaps, being higher than the inner one, substantially cover each other when closed. The parts of the lining attached to the outer lia-ps will, owin to the said trapezoidal-shaped cuts, only cover a small part of the flaps, which 70 part after closing of the inner flaps assumes a trapezoidal-shape and which comparatively low and folded trapezoid is bent upon the closed inner flaps when closing the outer ones. In blanks'for producing at boxes the substantially rectangular cuts serve to reduce the heights of the outer flaps so as to correspond to the breadth of the small sides of the boxes, in order to enable them to cover each other when closed. The inner flaps are comparatively higher, or so high as to suitably overlap each other when closed. In thisase the shorter parallel lines of the trapezoid may coincide-with the upper edges of the reduced flaps.

The edges ofthe lining and those of the f' carton do not coincide throughout but only at periodically repeated points between which points the lining is either shorter or broader than the carton according to the circumstances. l

In order that my invention may be clearly understoodand readily carried into effect, g5 I have illustrated in the accompanying drawings an embodiment of the invention, and wherein Fgs. 1 and 2 show perspective views of a complete blank for a carton of square sec- 100 y f means of a dhcsive along the shaded portions Fig. 2 is a similar View to Fig. 6 but illus- -trating a carton of fiat or shallow rectangular section.

In Figs. 1 and 2 it will be seen that the trapezoidal cut-away portions of the lining are substantially symmetrical with the parts where they are adhered'to the carton, thus providing non-adhesive triangular portions 1.1al which are yieldable to enable the fiaps to be folded over each other.

Fig. 3 shows a carton with its upper end open for filling.` In Fig. 4 the carton is shown vith flaps b folded outwardly and fiaps a turned down to cover the contents. The exposed upper surface is then pasted and the flaps b folded over to complete the closure as shown in Fig. 5.

Cartons of this type are used almost exclusively in automatic packing machines in which the flaps are folded and pasted automatically by the machine. In such machines two of the flaps (a) are folded over the contents first and the other two flaps (b) are turned outward as shown. The act of folding the flaps (b) outwardly will draw the flaps (a) down over the contents as shown in Fig. 4. The whole of the flat upper surface thus exposed is mechanically pasted by passing beneath a roller to which an adhesive is supplied. The flaps (b) are mechanically folded one after the other and are held in place until they adhere by passing beneath a pressure plate which may be heated to assist vdrying of the adhesive. It will be obvious that the lining must fold neatly and accurately for any excess would cause crumpling and insufficiency would cause tearing of the lining both of which would prevent an airtight and powder tight seal being obtained. It is also desirable that theflaps (a) should meet and overlap slightly to prevent paste coming into contact with the contents and to prevent the contents from adhering to the pasting roller.

It will be understood from the aforesaid that in the present invention some material is always removed owing to the reduction of the height of the flaps, and this enables square-shaped boxes and fiat boxes to be produced in a practical and satisfactory manner.

Boxes or cartons according to this invention may be constructed of any suitable material such as cardboard, paper, fibre or thelike and may be arranged to be readily collapslble. The lining material may be of paper of the greaseproof or any other suitable variety, or

of tin-foil, or metal, coated paper or fa ic.

The boxes or cartons may be provided with covering fiaps adapted to fold over one or both ends of the box. `The lining material prcferably extends all over the interior of the box and serves to keep the content-s from contact with the material of the box, whilst the ends are arranged to fold in such a manner as to afford an effective seal preventing any loss of packed dust or powder material and further protecting the contents against the ingress of air and serving to protect them against deterioration.

I claim In a carton having an interior lining secured to the outer case and adapted to fold auton'latically with the folding of the end iaps of the carton cas-c, two pairs of flaps at each end of the carton, one pair longer than the other pair, extensions of the lining completely covering one pair of fiaps and caused to adhere all round the edges thereof, trapezoidal extensions of the lining caused to adhere to the other flaps and free triangular pieces of lining connecting the trapezoidal lining on the latter fiaps to the lining on the former flaps.

CARL WILHELM HARTMANN.

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