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Publication numberUS2940654 A
Publication typeGrant
Publication dateJun 14, 1960
Filing dateSep 18, 1958
Priority dateSep 18, 1958
Publication numberUS 2940654 A, US 2940654A, US-A-2940654, US2940654 A, US2940654A
InventorsRoss A Easter
Original AssigneePillsbury Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Container
US 2940654 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

June 14, 1960 EASTER 2,940,654

CONTAINER Filed Sept. 18, 1958 3 Ross A.Easter ATTORNEY United States Patent CONTAINER Ross A. Easter, Minneapolis, Minn., assignor to The Pillsbury Company, a corporation of Delaware Filed Sept. 18, 1958, Ser. No. 761,851

4 Claims. (Cl. 229-43) This invention relates to containers, and more particularly to a carton with a thermoplastic cover which is applied theretoin a novel manner.

In numerous industries, such as those which are concerned with foodstuffs, there is considerable demand for a container which is both sift-proof and leak-proof, and which is, for the most part, constructed of fibrous materials, rather than of metal or glass.

It is among the objects of the present invention to provide an etficient container of the type referred to hereinabove which is simple and inexpensive.

The invention, then, comprises the features hereinafter fully described and as particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative of some of several ways in which the principles of the invention may be employed.

In said drawings:

Figure 1 is a perspective of the upper portion of a carton minus the top closure which has been constructed in accordance with the teachings of the present invention;

Figure 2 is a transverse sectional elevation taken along the line 11-11 of Figure .1; and

Figure 3 is a longitudinal sectional view taken along the line IIIIII of Figure 1.

Referring more particularly to the drawings, the numeral 2 designates the side walls of a rectangular folding carton or box the same having end walls 3. The aforementioned portions of the folding carton and the bottom (not shown) are of such construction and arrangement as to render them sift-proof and leak-proof, as by means of any of the protective coatings which are known in the art.

As previously mentioned, the teachings of the present invention contemplates the filling of the rectangular carton or box with the desired product, after which a thermoplastic cover is applied to certain portions of the upper ends of the side and end walls, as will be specifically described hereinafter.

As shown in Figure 1, the upper ends of the side walls 2 are horizontally scored and the portions thereabove bent to form relatively short flanges or flaps 2a which extend outwardly at an angle of at least approximately ninety degrees, and preferably more than one hundred and twenty degrees. In some instances, it may be preferable to extend this angle to close to one hundred and eighty degrees.

The distance from which the foreshortened flaps 2a protrude from the score line may be quite short, and only sufiicient to permit the said flaps to be turned outwardly and downwardly to the degree described. .The end walls 3 are provided with an inwardly extending flap portion 3b having an integrally formed and reversely extending flap portion 30 of similar size and shape which is adapted to overlie it. According to this construction, there is provided an inwardly extending flap member Sb-3c of double thickness which extends inwardly at approximately ninety degrees to the plane of the end wall 3 by which it is carried. With the side-wall flaps 2a disposed downwardly and outwardly as shown in Figure 2 and the end-wall flaps lib-30 folded upon each other and occupying a substantially horizontal position as shown in Figure 3, a top closure 7 is placed in position, the same being formed of a suitable thermoplastic material. This thermoplastic cover sheet 7 is heated and pulled downwardly by pressure or vacuum onto the sidewall flaps 2a and end-wall flaps fab-30 to the extent indicated in Figures 2. and 3; and this movement is continued until the thermoplastic coversheet 7 and the sidewall flaps 2a are moved downwardly into parallelism with the adjacent surface of the side-wall. In this manner, the top of the side edges of the carton is completely closed and sealed; and there is provided an edge portion 7a which locks against the outer and downwardly extending edges of the flaps, including the extremities of the latter.

The end wall construction provides a flap 3b-3c having an upwardly directed spring action against which the sealing of the thermoplastic top cover 7 may take place. In this construction, the side edges of the said thermoplastic top cover overlie the space between the upper and outer edge of the flap portion 30 and the score line from which the flap 3b extends, the relationship being as shown at 7c in Figure 4.

While I have shown and described certain specific embodiments of the present invention, it will be readily understood .that'I do not wish to be limited exactly thereto, since various modifications may be made without departing from the scope of the invention as defined in the appended claims.

I claim:

1. A container comprising a rectangular carton formed of sheet material and having a closed bottom, the upper ends of two of the side walls of said carton being scored along horizontal lines and bent outwardly to provide relatively short flanges which extend at angles of at least ninety degrees, the upper ends of the end walls of said carton being double-scored along horizontal lines and double-folded to provide relatively short flanges which extend inwardly of the carton at angles of approximately ninety degrees with respect to the end walls, and a thermoplastic cover overlying all of said flanges and being sealed to the outer edges thereof, said thermoplastic cover being also sealed to the end walls of said carton immediately adjacent their points of connection with the double-folded flanges.

2. A container comprising a rectangular carton formed of sheet material and having a closed bottom, the upper ends of two of the side walls of said carton being scored along horizontal lines and bent outwardly to provide relatively short flanges which extend at angles of at least one hundred and twenty degrees, the upper ends of the end walls of said carton being double-scored along horizontal lines and double-folded to provide relatively short flanges which extend inwardly of the carton at angles of approximately ninety degrees with respect to the end walls, and a thermoplastic cover for said container, said thermoplastic cover overlying all of said flanges and being sealed to the outer edges thereof, said thermoplastic cover being also sealed to the end walls of said carton immediately adjacent their points of connection with the double-folded flanges.

3. A container comprising a rectangular carton formed of sheet material and having a closed bottom, the upper ends of two of the opposing side walls of said carton being scored along horizontal lines and bent outwardly to provide relatively short flanges which extend at angles of at least ninety degrees, the upper ends of the other two side walls of said carton being double-scored along horizontal lines and double-folded to provide relatively short flanges which extend inwardly of the car-ton at angles of approximately ninety degrees with respect to said first-named side walls, and a thermoplastic cover overlying all of said flanges and being sealed to the outer edges thereof, said thermoplasticeover being also sealed to said first-named side Walls immediately adjacent their points of connection with said double-folded flanges.

4.- A container comprising-a rectangular carton formed of sheet material and having a closed bottom, the upper ends of two of the opposing side walls of said car-ton being scored along horizontal lines and bent outwardly to provide relatively short flanges which extend at angles of at least one hundred and twenty degrees, the upper ends of the other two side walls of said carton being double-scored along horizontal lines and double-folded References Cited in the file of this patent UNITED STATES PATENTS 1,815,565 Hill-et a1. July 21, 1931 2,041,537 Frost May 19, 1936 2 ,740,444 Martinelli Apr. 3, 1956 2,758,775 Moore Aug. 14, 1956 owler." on...

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1815565 *Jul 13, 1928Jul 21, 1931Lawrence Paper Mfg CompanyEgg shipping case
US2041537 *Nov 16, 1934May 19, 1936George S FrostPackage
US2740444 *Oct 19, 1953Apr 3, 1956Rogers Plastic CorpContainer
US2758775 *Apr 19, 1954Aug 14, 1956Arlington Moore GeorgeContainer structure with integral closures
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3067653 *May 5, 1960Dec 11, 1962Lesser MortimerApparatus for closing containers
US3318487 *Jun 28, 1965May 9, 1967Illinois Tool WorksComposite package
US4261505 *Feb 4, 1980Apr 14, 1981Sekisui Kaseihin Kogyo Kabushiki KaishaPackaging container
US4927075 *Jul 3, 1989May 22, 1990Pure-Pak, Inc.Multi-piece flat top container
US8281980 *Mar 21, 2005Oct 9, 2012Stora Enso OyjCup package made of a fibre-based material
DE3222180A1 *Jun 12, 1982Dec 15, 1983Altstaedter Verpack VertriebPackung fuer fliessfaehige fuellgueter und verfahren zu deren herstellung
EP0751082A1 *Jun 13, 1996Jan 2, 19974P Nicolaus Kempten GmbHFolding box
EP1607337A2 *Jun 10, 2005Dec 21, 2005Kappa Packaging B.V.Carton box, blank, method for manufacturing said box
Classifications
U.S. Classification229/125.35, 235/60.0TK
International ClassificationB65D5/64, B65D77/20
Cooperative ClassificationB65D77/2024, B65D5/64
European ClassificationB65D77/20E, B65D5/64