Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS1995523 A
Publication typeGrant
Publication dateMar 26, 1935
Filing dateFeb 27, 1933
Priority dateFeb 27, 1933
Publication numberUS 1995523 A, US 1995523A, US-A-1995523, US1995523 A, US1995523A
InventorsSwan Smith
Original AssigneeDavid C Shepard
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Laminated container
US 1995523 A
Abstract  available in
Images(2)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

March 26, 1935. 5. SMITH 1,995,523

LAMINATED CONTAINER Filed Feb. 2'7, 1953 l 2 Sheets-Sheet 1 awe/WM Swan Smilh March 26, 1935. s. SMITH 1,995,523

LAMINATED CONTAINER Filed Feb. 27, 1935 2 Sheets-Sheet 2 Swan Smi H 1 Patented Mar. 26, 1%35 re atta LAPMNATED CONTER Smith, White Bear, Minn, assignor to David C. Shepard, St. Paul, 1'

Swan

HEISSUED i :l. ill

Application February 27, 1933, Serial No. 658,689

12 (Claims.

My invention relates to laminated containers and has for its object to provide a container and a method of forming the same, whereby a conical container may be constructed without waste of material.

Another object of the invention resides in providing a container having a bottom formed with a flange extending downwardly therefrom and in further providing a wall structure built about said flange.

An object of the invention resides in providing a container in which the wall structure is formed from sheets of paper glued one upon the other and of a width greater.than the height of the container.

A still further object of the invention resides in providing a container in which the sheets used in the construction of the Wall structure are individually turned back at the lower marginal portion thereof and glued to the flange of the bottom and to one another.

An object of the invention resides in' providing a laminated paper container constructed of sheets of paper formed to overlap at their ends and in further constructing the sheets so that the width of the overlap varies throughout the length of the container.

Another object of the invention resides in constructing the container conical and in utilizing sheets of uniform length to form the varying overlap.

A feature of the invention resides in utilizing sheets for the purpose in which the ends thereof .are parallel to one another.

A still further object of the invention resides in utilizing sheets having the upper and lower edges thereof curved and of the same degree of curvaure. Anobject of the invention resides in utilizing a plurality of said sheets and in arranging them one upon the other and in further constructing said sheets with such a degree of curvature that the upper curved edges of the successive sheets placed one upon the other lie in continuation of one another.

A still further object of the invention resides in employing a metal hoop disposed between the laminations of the wall structure of the container and in placing said hoop in proximity to the flange of the bottom.

An object of the invention resides in arranging said hoop so as to project upwardly above the upper surface of the bottom to reinforce the container at the juncture between the wall struc ture and bottom.

Another object of the invention resides in providing a method of constructing laminated paper containers which consists in wrapping sheets of paper one at a time about a mandrel against which a flanged bottom is held and in gluing the same to the flange of the bottom and to one another and which further consists in arranging the sheets so-that the lower marginal portions thereof normally project outwardly beyond the ends of the flange and which further consists in individually turning said projecting marginal portions of the sheets back upon the inner surface of the flange as the sheets are applied and in gluing the same to said flange and to one another.

Other objects of the invention residein the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

In the drawings:

Fig. 1 is a perspective View of a container illustrating an embodiment of my invention.

Fig. 2 is a perspective view illustrating the method of constructing the container and showing the container in inverted position.

Fig. 3 is a perspective view of the bottom of the container detached therefrom and viewed from the underside thereof.

Fig. 4- is a perspective viewof the hoop used with the container.

Fig, 5 is a developed'view of the blanks from which the wall structure of the container is constructed illustrating the method of cutting the same from a roll of paper.

Fig. 6 is a perspective view of a portion of the finished container shown in Fig. 1, viewed from the underside thereof. v

Fig. 7 a sectional detail view taken on line 77 of Fig. 1 and drawn to an enlarged scale.

Fig. 8 is a view similar to Fig. '7 showing the manner of applying the individual sheets of the wall structure to the bottom. e

In the construction of conical laminated containers and particularly containers formed of paper, considerable waste has heretofore occurred due to the necessity of cutting the sheets from which the container is constructed in the form of a truncated segment of a circle. In addition, considerable difficulty has been encoun tered in properly securing the bottom to the wall structure and in forming a sufliciently rigid bottom structure to stand up under the conditions to which the container may be subjected. The present invention provides a container in which these disadvantages are entirely overcome and by means of which sheets may be out without waste, the sheets being arranged to overlap and the overlap at the ends of the sheet and the marginal portion at the lower edges thereof being utilized in the formation of the container. These disadvantages are further eliminated by turning the sheets one at a time about the flange of the bottom so as to equalize the tension in all of the sheets and by further inserting a metal hoop between the various sheets forming the wall structure of the container, to stiffen and reinforce the same.

lVLv invention comprises a container illustrated at A in Fig. 1 which is particularly adapted for use in shippingbutter and similar commodities. This container comprises a wall structure 10 having a bottom 11 secured thereto-and open at its upper end as indicated at 12. A hoop 13 encircles the container at the upper end thereof. Any suitable cover may be used with the container and such construction forming no particular feature of this invention, has not been illustrated in this application.

The bottom 11 may be constructed of paper or any other suitable material. When constructed of paper a number of sheets of paper which are indicated at 14 are employed which are circular in form and which are of a diameter somewhat greater than the diameter of the container at the lower end thereof. These sheets are glued one to the other and before the glue has set are placed in suitable dies and pressed to form a planiform portion 15 adapted to extend across the bottom of the container and a flange 16 de- 1 pending from the planiform portion thereof as clearly shown in Figs. 3, '7 and 8 and adapted to lie against the inner surface of the container. This bottom is then dried either in the atmosphere or in an oven to cause the glue to set, or, if preferred, heat may be applied in the dies so that the bottom is caused to take the desired form when removed from the dies. If desired, the flange 16 may issue at right angles to the planiform portion 15 of the bottom 11 in which case,

the male die member is easily withdrawn from the bottom after the same has been formed. If, however, the flange 16 is desired to taper to conform to the surface of the container, the same may be accomplished by first constructing the flange to lie at right angles to the planiform portion by pressing the same in suitable dies'and thereafter and before the glue is set, forcing the flange into a suitable conical hoop whereby the free edge of the flange is drawn together and in thereafter causing the glue to set and to give the flange a permanent form.

For building up the wall structure of the container individual sheets of paper 19 are employed which are cuttransversely from a roll of paper, the unrolled portion of which is indicated at 30. The sheets 19 are of a length equal to the width of the paper 30 and the ends 31 and 32 of these sheets which are formed through the lateral edges of the paper coming from the roll and are parallel to one another. The sheets 19 are severed from the roll by means of a cutter traveling in an arc of a circle. The are of the circle is such that when the sheets are rolled upon a suitable mandrel, the upper edge 25 of the sheet forms a true circle at the open end of the container. The next adjacent sheet is severed from the roll by means of the same cutter traveling in the same are thereby forming the lower edge 26 of the sheet with the same degree of curvature as the upper edge. Due to the fact that the container is in the shape of a frustrum of a cone a true circle at the lower end would be formed by -a curved line 33 concentric with the circle of the edge 25. By means of this expedient a crescentshaped band 34 of material is left at the lower marginal portion of the sheet which band is utilized in the formation of the container as will be presently described. Likewise the ends 26 and 29 of the sheet 19 are caused to overlap in the formation of the wall structure of the container, which overlap is utilized to stiffen and reinforce the container.

After the bottom is properly cured the wall structure is built upon the same in the following manner: A mandrel diagrammatically indicated at 17 in Figs. 2 and 8 is employed which is in the shape of a frustrum of a cone and which is of dimensions corresponding with the inner dimensions of the finished container. The flange 16 of the bottom 11 is of such shape and dimensions as to lie in continuation of the surface of the mandrel 1'7 when applied to the end thereof. In the construction of the wall structure the mandrel 17 is mounted upon a suitable support and the bottom 11 held against the end 18 thereof with the outer surface of the flange 16 lying in continuation of the surface of said mandrel. Glue is then applied to both the inner and outer surfaces of the flange 16 of said bottom. A sheet of paper 19 cut as previously described is then wrapped about the mandrel with the lower marginal portion 20 thereof projecting outwardly below the free edge 21 of the flange 16 as shown in dotted lines in Fig. 8. -Glue is then applied to the end of the sheet 19 first applied to the mandrel which is designated by the reference numeral 28 and the other end 29 of the sheet caused to overlap said last-named portion of the sheet and to form a joint extending longitudinally of the container and indicated in its entirety by the reference numeral 39. Due to the particular shape of the sheet, the overlap is somewhat in the shape of a trapezoid increasing in width throughout the length of the container and being of greatest Width at the lower end thereof as clearly shown in Figs. 1 and 2. As the sheet is applied, the same adheres to the outer coated surface of the flange 16 of the bottom 11. After the sheet has been so applied and the ends thereof secured together, the marginal portion 20 of the sheet is turnedinwardly about the free edge 21 of flange 16 and caused to adhere to the coated inner surface 24 of said flange. Due to the particular curvature of the upper edge 25 of the sheet 19, the same forms a true circle for the open upper end of the container. Since the lower edge of the sheet, which I have designated by the reference numeral 26, has the same curvature as the upper edge, the same will not form a true circle when turned inwardly upon the inner surface 24 of flange 16. Sheet 19 is, however, so arranged that the medial portion 27 of the sheet just clears the under surface of the planiform portion 15 of bottom 11. This causes the edge 26 to recede from said bottom as best shown in Figs. 2, 6 and 8, the marginal portion at the ends 28 and 29 of the sheet extending well inwardly of the lower edge 21 of the flange 16. The exact position of the crescent shaped band 34 of the sheet can best be determined by an inspection of Fig. '7 which illustrates the position ofthe corresponding part of the subsequent sheets.

After the first sheet 19 has been applied and glued to the flange 16 of bottom 11, other sheets .in Fig. 1.

one another is illustrated in Fig. 2 in which the.

sheet 35 has been shown as partly wrapped about the mandrel and secured to the sheet 19. Where six sheets would ordinarily be used in the construction of a container to cause the desired.

strength, with my invention the sheets may be made of sufiicient length and only flve'sheets employed- Where five sheets are utilized the joint formed at the ends of each sheet would be disposed equidistant about the circumference of the container so that the overlap of the various sheets would be uniformly distributed throughout the circumference of the container and a container of uniform strength throughout would result. This would be accomplished by rotating the mandrel 17 through one-fifth of a revolution and applying the next sheet at exactly the same location with respect to the support for the mandrel as the first sheet. The mandrel would then be rotated another fifth of a revolution for each succeeding sheet until all of the sheets had been applied. As each sheet is applied the marginal portion 20 thereof at the lower'edge of the sheet is turned back upon the corresponding marginal portion of the previously applied sheet so that all of the said marginal portionsare glued together and to the flange 16 of the bottom. Due to the construction of the sheets as previously described, the medial por tions 27 of the sheet become distributed about the inner surface 24 of flange 16, whereby the doubled back part of the wall structure is of uniform thickness about the circumference of the flange and gradually tapers off to \a single thickness at the juncture of the flangellfi with the planiform portion 15 of the bottom 11. The particular manner in which the various sheets lie one upon the other within the flange 16 is best shown in Fig. 6.

The joints 39 of the various sheets, as previously explained, are equally distributed about the circumference of the wall structure of the container. The exact relation of these joints of several of the sheets are shown in dotted lines At such localities, six thicknesses of material are present which give the container the desired strength at such localities. Intermediate the said joints at localitiesdesignated length of the sheets is then selected so that the apexes 42 formed between the edges 31 and 32 of juxtaposed sheets lie at such localities. The container is then of a minimum strength below such elevation equivalent to a container constructed of six sheets of paper and above such locality of a minimum strength of a container constructed of five sheets of paper. The joints 39 in addition to giving circumferential strength to the container form ribs extending lengthwise of the container which serve to stiffen the same and to lend longitudinal rigidity thereto. In this manner a much stifier container can be formed than where the sheets of paper used in the construction of the body structuresare out exactly to shape and the surplus discarded.

Where the container is to receive rough handling a reinforcing hoop 43 shown in detail in Fig. 4 is employed which is imbedded within the interior of the wall structure 10. This hoop consists of a band of metal riveted, welded or otherwise secured together at its ends as designated at 44. This hoop is imbedded in between the layers of paper as the same are applied tothe mandrel. Where five sheets are utilized, sheets 19 and 35 are first placed upon the mandrel and glued to the bottom 11 and to one another. Hoop 43 is then forced over the end of the bottom and upon'the outer surface of the sheet 35 until the lower edge of said hoop lies substantially flush with the lower edge 21 of the flange 16. The other sheets 36, 37 and 38 are then applied as previously described enveloping the said hoop and causing the same to become firmly imbedded within the interior of the wall structure proper. The hoop 43 is of such height that the upper end 46 thereof extends well above the upper surface 47 of the planiform portion 15 of bottom 11. This serves to reinforce the container at the juncture bethe. formation of the body structure which would ordinarily be wasted are utilized to give both circumferential and longitudinal rigidityto the container and to reduce the total number of sheets of paper necessary. The container can be constructed in an extremely simple and expeditious manner, there being no waste to be handled and to be removed from the machine by means of which the container is built. By individually turning back the marginal portions of the container at the lower edge of the sheets used in the wall structure equal'tension is placed upon each sheet and a much stronger and more substantial construction results. By the use of the hoop imbedded within the body structure of the container, rigidity is given to the flange thereof. At the same time shearing of the wall structure of the container at the juncture of the same at the bottom is entirely prevented.

Changes in the specific form of my invention, as' herein disclosed, may be made within the scope of what isclaimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent 1. A paper container comprising sheets of paper glued one upon the other to form a wall structure for the container, said sheets overlapping at their ends, the amount of overlap of said sheets varying throughout the length of the container.

2. A paper container comprising sheets of paper glued one upon the other to form a wall structure for the container, said sheets being constructed at their ends to form an overlapping joint at the ends of the sheet in the shape of a trapezoid with the base of the trapezoid at the bottom of the container.

3. A paper container comprising sheets of paper glued one upon. the .nther to form a wall structure for the container, said sheets overlapping at their ends, the amount of overlap of said sheets varying throughout the length of the container, and being greatest at the bottom of the container.

4. A paper container comprising a number of sheets of paper glued one upon the other to form a wall structure for the container, said sheets overlapping at their ends, the amount of overlap of said sheets varying throughout the length of the container, said sheets being all arranged with the greatest amount of end of the container.

5, Apaper container comprising a number of sheets of paper glued one upon the other to form a. wall structure for the container, said sheets overlapping at their ends, the amount of overlap of said sheets varying throughout the length of the container, said sheets being all arranged with the greatest amount of overlap at the bottom of the container.-

6. A conical container comprising a wall struc ture formed of sheets of paper glued one upon the other, said sheets being of a uniform length to provide an overlap at the ends 'of the sheet varying in width throughout the length of the container. i

7. A conical container comprising a wall structure formed of sheets of paper glued one upon the other, said sheets having parallel ends to provide an overlap at the ends of the said sheets varying in width throughout the length of the container.

8. A conical container comprising a wall structure formed of sheets of paper glued one upon the other, said sheets being formed with curved upper and lower edges, both of the same curvature, the edges at one end of the container lying in alignment with'one another, and the overlap at the same 9. A conical container comprising a. wall structure formed of sheets of paper glued one upon the other, said sheets being formed with curved upper and lower edges, both of the same curvature, the curvature of the edges of the sheets at the upper end of the container being such as to cause said edges to lie in alignment and the marginal portions of the sheets at the other end of the container being folded back and glued together.

10. A conical container comprising a bottom getherand to said flange.

11. A container comprising a bottom having a flange issuing downwardly therefrom, a wall structure comprising sheets of paper glued one upon the other, the lower marginal portions of said sheets being folded back and glued to said flange and to one another, and a metal hoop imbedded between said sheets of'paper in proximity to the lower edge of said flange.

12. A container comprising a bottom having a flange issuing downwardly therefrom, a wall structure comprising sheets of paper glued one upon the other, the lower marginal portions of said sheets being folded back and glued to said flange and to one another, and a metal hoop imbedded between said sheets of paper in proximity to the lower edge of said flange, said hoop extending upwardly beyond the upper surface of said bottom, and reinforcing the container at the juncture between the bottom and wall structure.

' SWAN SMITH.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6311431Jun 21, 2000Nov 6, 2001Southpac Trust International, Inc.Pot cover with preset folds
US6427381Aug 24, 2001Aug 6, 2002Southpac Trust Int'l. Inc.Pot cover with preset folds
Classifications
U.S. Classification229/4.5, 493/109, 229/5.5
International ClassificationB65D3/22, B65D3/00
Cooperative ClassificationB65D3/22
European ClassificationB65D3/22