US1995286A - Paper bag - Google Patents

Description

March 26, 1935. P. ARZET 1,995,286

PAPER BAG Filed April 9, 1934 2 Sheets-Sheet 2 Patented Mar. 26, 1935 UNIT-ED STATES APATENT OFFICE PAPER BAG Paul Arzet, Shelbyville, Ind., assigner to The Kennedy Car Liner and Bag Co., Shelbyville, Ind., 'a corporation of Indiana pplication April 9, 1934, Serial N0. 719,780

3 Claims.

between the diagonals of the bottom are of multi-v ply construction and triangular shape, affording stiff edges defining the diagonals of the bottom and the opposite sides of its perimeter whereby the bag unfolds definitely along the sides `of these stiff areas in assuming its square expanded shape.

A further object of the invention is the provision of a bag folded as above described in which certain of the triangular multi-plies are pasted together externally of the bag, stiffening the triangular areas and at the same time avoiding the presence of paste on the inside of the bag.

Still another object of the invention is to provide a bridging seam or strip of plural thickness extending along the altitudes of the stiffened triangular areas and across the apex'orpoint of intersection of the diagonals of the bottom whereby an exceedingly strong reinforcement for the bottom of the bag is provided.

Other objects of the invention will appear as the following description of a preferred and practical embodiment thereof proceeds.

In the drawings which accompany and form a part of the following specification and throughout the several gures of which the same characters of reference have been employed to designate identical parts:

Figure 1 is a plan view of the blank indicating the several lines of fold;

Figure 2 is a perspective View of one end ofV the blank folded to form a plicated tube;

Figure 3 is a perspective view indicating the re-entrant pleats or folds;

Figure 4 is a perspective view showing the plicated tube folded fiat;

Figures 5, 6, 7, 8, 9 and 10 areperspective views showing successive steps in the folding; Figure 11 is a section taken along the line 11-11 of Figure 10; and

Figure 12 is a perspective view of the bottom of the bag in expanded condition.

Referring now in detail to thel several figures the numeral 1 represents a blank which is creased longitudinally as shown defining lines of fold 2 and having longitudinal edges 3 and 4 adapted to overlap and being adhesively joined forming a tube 1a such as is shown in Figurey 2. other 1ongitudinal creases define the apices of re-entrant dihedral angles 6, '7, 8 and 9 when the tube is folded as diagrammatically indicated in Figure 3.

The blank is also formed with a transverse crease 11 which defines the perimeter of the bottom when the bag is formed, and a transverse crease 12 which defines a margin 13 forming the bridging seam which extends across the bottom of the finished bag. f

At any suitable time during the manufacture p of the bag adhesive is applied to the stippled areas 14 and 15 on one side of the blank, to the stippled portions 16 and 17 of the margin 13 and throughout the entire length of the margin 13 on the reverse side.

The plicated tube 18 is folded flat as shown in Figure 4, the angles 6 and '7- becoming .180 angles and the angles 8 and 9 zero angles. With the tube 18 in this form, the margin 13 is'folded over as shown in Figure 5 and adhesively united both inside, and to the Iside of the bag against which it is folded. 'The' finger is then inserted between the laps of the zero angle 8 and the laps spread-apartas indicated in Fig. 6 until the lower lap can be'folded along a line 19 extending at an angle45 to the edge of the folded margin 13. With the fingers still inserted between laps of the angle 8, the portion 20 of the marginwhich unites the laps of the angle 8 is swung over until it assumes a' position against the bag perpendicular to the edge of the remaining portion of the margin 13.' When the marginal portion 20 is pressed fiat against the bag as shown in Figure 7, the line 21 along which the upper lap of the angle 8 folds will rest upon the bag at an angle of 45 to the bottom edge of the bag. When the bag is thus. partially folded, it is inverted as shownin Figure 8. The fingers are next inserted between the laps of the zero angle 9,-and the laps of said angle are spread apart as indicated in Figure 9. The lower lap is folded upward along a line coincident with the line of fold 21 on the opposite side of the bag and the portion of the margin 13 swings over into a fiat position against the bag opposite to and congruent with the portion 20.v In the course of this manipulation the upper lap folds along the line 22 which arranges itself coincident with the line 19 onthe opposite side of the bag. The appearance of the bag thus folded as shown in Figure 10, the bottom coming to a point and the lapsv of the angles 8 and 9 being firmly united to the sides of the bag which they overlie by means of the adhesive illustrated in the areas 14 and 15 in Figure 1.

The back folding o f the laps of the angles 9 `and 10 produce new angles 23 and 24 which when the bag is opened expand into angles of 180 permitting an outward buckling of the apical edges of said angles at the points 25 where the longitudinal creases 5 are intersected by the transverse crease 10.

Simultaneously with the buckling of the apices of the dihedral angles 23 and 24, the angles 8 and 9 which have now become 180 angles also buckle outwardly in their dihedral apices at corresponding points 25 permitting the bottom Vof the bag to assume the square form shown in Figure 12.`

vIt will be understood that the multi-ply` triangularareas 26 and 27 'whichfappear on the outside of the folded bag as a result Vof the above fagonals ofthe square bottein-` l The by hand, it is of course understood to be ame nable to manufacture by suitable machinery.

What I claim is:

l. Bag comprising a tubular member re-enew' trantly folded at opposite sides to form longitudinal `dihedral angles the sides of which are double folds, the bottom of said tubular member being closed by a folded seam derived from the end margins ofall plies of said member, secured together and to the'portion ofthe bag which said seam overlaps, said seam closing the lower ends of the said dihedral angles, the front. and back of the bag being formed by the flatly opened inner faces of the respective dihedral angles, and

substantially triangular double ply reinforcements congruent with that part of the front and back ofthe bag which will be part of the bottom t when the bag is expanded, and adherent thereto,

said triangular reinforcements being derived from the lower corner portions of the sides of the re'- spective dihedralangles-adjacent the closed ends,

`said corner portions being opened out sov that the closed endsof the dihedral a'nglels havev become l vthe altitudes of the respective triangularreinv` forcements.

2. Bag" comprising a .plicated tubular member 'withinteg'ral square bottom Vwhen'expanded, said bottom 'having triangular areas defined by inl,texfsecting diagonal creases, one pairv of oppositely y disposedvtriangular'areas'beng of multi-ply constructionjl-withfcertain of said plies pasted't to'- .L'g gether, said multi-ply. triangular areas constitutf ying'reinforcements thesides of'which form stiff delineations fordetermining thevv square shape of I thjbottom-when the bag,isezrplamded. n r l mospheric pressure in c theme ora-the referierte-beziehung' aand square shape jregardlessf ,the of a. vthebag'or the heavinesslof themteal'of which 45. i-

itisconstructed. a,

Furthermore, `on account ofthe multi-ply of the opposite triangular and the plural Dlyfntureof the marginalfstrip which"l l I have in the abovey description pains :man extremely strong' construction- QQ*3;Baggcomprisingaplicated tubular member withintegral square bottomwhen expanded, said bottomlh'aving trivallslargjareas deflnedby vin- `trsecti-r1sl@liirluuirl'al resesronepair .vffwposilyjdi'spose'dftriangular areas being vof xnulti-ply c'ons'tructionQ-with certain of said plies pasted to- -gether", saidmultieply triangular areas constitut-A ing reinforcements the sides of which forniv Vstiff vdelirieatiens for l deterniining the `1 square' shape ofthe bottom''when the lbagis expanded, said tubular member. being.v closed byv an end yseam w'hic'h in the `e'xpandedfstate ofthe bag `extends continuously acrossl the squarepbottomalong the -v iltitu'des of the triangular. reinforcementsand beingpast'a t0 the Surfacewhch itcontacts. c

Images