US2056893A - Paper container and method of producing same - Google Patents

Description

Qct. 6, 1936. w, E AMBERG- 2,056,893

PAPER CONTAINER AND METHOD OF PRODUCING SAME Filed J 1y 1, 19:56

mvmbm Patented Oct. 6, 1936 UNITED STATES PAPER CONTAINER AND METHOD OF PRODUCING SAME Walter E. Amberg, Chicago, 111.,

versal Paper Products Company,

assignor to Uni- Chica 111-. v

a corporation of Illinois Application July 1, 1936, Serial No. 88,451

, 9 Claims. This invention relates to paper containers, and

has for an important object thereof the provision of an improved type of cone-shaped paper cup for use in dispensing water, soda and other liquids.

A cup of a type commonly used today is disclosed in Reissue Patent No. 15,381, granted June 13, 1922, upon application of one Di F. Curtin. As therein'sh'own, the blank from which the cup is formed is of approximately triangular form, having an extension located at the junction of two converging edges. In the manufacture of cupsfrom blanks of this type and in the manufacture of paper cups generally today it is customary to sheet of suitable paper. In so doing the paper is stretched across a flat surface and the dies, which are arranged to cut. the maximum number of blanks from the paper, descend and perform the cutting operation. Thereafter the blanks are stacked, magazined' and subsequently are fed singly to a cup-folding mechanism. In forming blanks of such configuration a great deal of paper is wasted despite the care which may be exercised in arranging the dies.

It has also been heretofore proposed to form cup blanks from a roll of paper by stamping them or cutting them from the roll, one by one, as the paper is unwound. Here again, however, owing to the shape or configuration of the blank, 9. considerable amount of the paper in the roll is wasted. Such paper is scrapped and forms no part of the finished cup.

With the foregoing desideratum in view, an important feature of the present invention resides in the provision of a cup blank and an improved cup formed therefrom which may be made from a roll of paper without any appreciable loss or waste thereof.

In accordance with the practice of the present invention, a roll of paper, the width of which corresponds to the width of the cup blank, is cut transversally in a manner scribed to form a series of blanks without waste.

Another important feature of the invention resides in the provision of an improved cup formed from blanks of the character herein described. This cup is distinguished by the fact that it has a double thickness at its top portion where strength is desired, and a single thickness at its bottom or apex portion where strength is not essential. The provision of a cup of this type permits. the use or? lighter stock and inasmuch as there is no waste resulting, a stronger cup is obtain-ed. in other words, although the paper stock may be lighter, the entire stock goes into the cup, none of it being scrapped, with the recult that a stronger, more rigid container is obtained.

@ther objects and ieatures of the invention will die stamp the blanks from a large hereinafter to be debecome apparent from a reading of the following side elevational view in perspective of the cup shown in Figure 2; and Figure 4 shows a cup in the process of being formed from blanks of the type indicated in Figure 1.

Asillustrated, a strip of paper II), the width of which corresponds to the width of the cup blank to be formed therefrom, is fed from a roll of paper, not shown. able position to-cut the free extremity I! of the strip l0. As illustrated, theshape of the out is an arcuate one, the'center of the arc corresponding with the longitudinal axis of the strip. All of the arcs have equal radii. It will be noted from the preferred embodiment illustrated in the drawing that the radius of curvature of each are has its center on each succeeding are preferably at the intersection of the central vertical axis with the'succeeding arc. For instance, in Figure 4 of the drawing the center of the are 30 is at the point 38. As the strip is fed past the knife successive cuts, indicated by the dotted lines l4, l6, I8, 20, etc., are made, whereby are formed a series of identical blanks having their upper and lower edges correspondingly curved and their side edges parallel.

specification in the light of the accompanying.

A knife-is arranged at a. suits As illustrated in Figure 4, the side edges are indicated by the'reference numerals 24, 26, the bottom edge, so termed because it forms the hottom of the cup, by the reference numeral 28, andthe upper edge, which forms the top of the cup, by the reference numeral 30. The upper and lower sides of each blank may also be termed convex and concave, respectively. The cup blank issymmetrical with respect to the longitudinal axis of the strip of paper M, which axis may be termed the vertical axis of the severed blank, as indicated by the line A-A in Figure 4, which is to say that for every point on the blank to the left of. the axis A-A of Figure 4 there is a corresponding point on the portion of the blank lying to the right of the line.

as may be clearly seen from as much of the description as has already been given, the blanks are successively formed, with the upper edge of one blank corresponding with the lower edge of the blank in the rear, in such a manner thetno waste results. Every particle of the paper strip shown in Figure 1 may be employed in forming the cup of Figure 3. In this wise a lighter stock may, if desired, be employed, and a stronger struc= ture will be pmduced by reason of having entirely eliminated waste. so far as known, it is believed that this is the first paper cup to be formed from a. continuous strip of paper without waste. In this connection it may be remarked that if desired the sharptips or points 32, 24 shown in Figure 4 may be removed by cutting along the dotted lines 36, although it will beappreci'ated that such loss of paper is inconsequential and immaterial. In other words, notwithstanding the removal of these tiny segments, it may be appropriately stated that the cup blank is formed without waste of material. I r

In forming the cup the apex' 28 is located at the central point of the lower arcuate edge 28. The cup is rolled in the manner illustrated in Figure 4, and upon completion assumes the shape shown in Figures 2 and 3. The portion of the lower arcuate edge 28 located to the right of the axis A--A of Figure 4 is folded within the cup and becomes the line illustrated by the reference numeral 40 of Figures 2, 3 and 4. The portion of the lower edge 28 located to the left of the axis A--A folds around the outside of the cup and becomes the portion illustrated by the reference numeral 42 of Figures 2 and 3. The side edge 26 folds within the cup in the manner illustrated by the corresponding reference numeral in Figures 2 and 3, and the left side edge 24 folds on the outside as similarly illustrated in those figures. When the cup has been folded in the manner described, it is symmetrically formed or wrapped with respect to its vertical axis 13-3 in Figure 3 in the sense that the edges 24 and 28 are similarly positioned on opposite sides of the cup, the right and left portions 40, 42 of the lower edge are sim-- ilarly' positioned on opposite sides of a plane passing through the central axis 8- 3 and the point 1: which marks the junction or the tips 22 and 34 of the blank.

' A cup formed in the manner described is strong and leak-proof. The practice heretofore in mak-- ing paper cups has been to reinforce the apex portion by wrapping it thoroughly to form a multiple ply or wrap at that point. Also heretofore, as illustrated by the Curtin patent already referred to, it has been customary at the top portion of the cup to have only a very small overlap. This has resulted in weaknes at the top of the cup and strength at the bottom. In accordance with the present invention it is believed that a cup should be strong at the top and that a double wrapped portion at the bottom is not necessary, It is in conformity with this view -that the use of symmetric blanks is permitted and waste is eliminated. In the cup illustrated and described hereend is double wrapped to ailord strength.

It is to be appreciated that the cup or container comprehended by this invention may be used for various purposes and that modifications in the design and construction of the cup maybe made, for instance, other pliable sheet materials, e. g.. moisture-proof regenerated cellulosic materials, rubberized sheet materials, and the like, may be substituted for paper, without departing from the true spirit of the invention as set forthin the appended claims.

Having thus described the invention. what I claim as new and desire to secure by Letters Patent of the United States is:

1. A conical paper cup symmetrically wound from a blank having two straight parallel sides together with convex and concave sides of equal radii, and with the apex of the cone at the center of the concave side, said cup having a double cave arcuate lower edge and a convex arcuate upper edge of the same radius of curvature as the lower edge. said radius of curvature for the upper edge having its center at the intersection of the central vertical axis and the concave lower edge.-

3. A conical vessel of the character described formed from a blank comprising curved upper and lower edges and parallel side edges wound in such relationship that the lower corners terminate near the top of the vessel and provide a double thickness of material in the upper portions of said vessel.

4. A conical paper cup formed from a blank comprising curved upper and lower edges and parallel side edges wound in such relationship that the curved upper edge forms the periphery of the radius of the upper edge, and the corners of the lower edge terminate near the top of the cup. 1 l

5. A conical paper cup formed from a blank comprising two straight parallel sides, an arcuate concave side and an arcuate convex side having the same radius as the concave side and with the center of radius of the curvature at the center of the concave side, said blank being symmetrically wound in such relationship that the convex side forms the top of the cup. the apex of the cone is at the center of the concave side and the lower edges terminate at substantially the same point in the upper portions of the cup, one of said edges being on the inside and the other on the outside of the cup.

6. A blank for formingconical vessels having a pointed apex, said blank comprising a lower edge consisting of a single concave arc and an upper edge consisting of a single convex are having the same radius of curvature as the concave lower edge and with the center of said radius of curvature on the said lower concave edge.

7. A blank for forming conical vessels having a pointed apex, said blank comprising parallel side edges, as lower edge consisting of a single concave arc and an upper edge consisting of a single convex arc having the same radius of curvature as the concave lower edge andvwith the center of said radius of curvature on the said lower conformed from a blank comprising a lower edge consisting of a single concave arc and an upper edge consisting of a single convex are having the same radius of curvature as the concave lower edge and with the center of said radius of curvature on the said lower concave edge, said vessel being formed by winding said blank around a point on the lower concaveedge as the apex of the cone.

9. A conical vessel having a pointed apex formed from a blank comprising parallel straight sides, an arcuate concave side and an arcuate convex side having the same radius as the concave side and with the center of radius of curvature on the concave side, said blank being wopnd around a point in the central portion of the concave side as the apex of the cone. 1 Y

WALTER. 1:. mm.

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