US2275485A

US2275485A - Square bottom bag

Info

Publication number: US2275485A
Application number: US178585A
Authority: US
Inventors: Evelyn H Ames
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-12-07
Filing date: 1937-12-07
Publication date: 1942-03-10
Anticipated expiration: 1959-03-10

Description

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A Patented Mar. 10,1942

UNITED STATES PATENT OFFICE SQUARE BOTTGM BAG John F. Ames, Selma, Ala.; Evelyn H. Ames executrix oi.' said John F. Ames, deceased Application December 7, 1937, Serial No.v 178,585

Claims.

This invention relating as indicated to a bag is more particularly directed toa square bottom bag. This term as used in the art designates a` bag in which the bottom when'fllled extends at right-angles to the front and rear portions, or 'body portion, and yis not used to denote the cross-section of the bag, which may be square, rectangular, circular or A triangular.

In the past difficulty has been encountered in the manufacture of square bottom bags because the bottom portions` of any bag require considerable folding and it is impossiblel to fold relatively stiff material, such as heavy paper, which is ordinarily required. On the other hand if light weight paper is used which vfolds readily to form the bottom, such material will not stand the ravages of shipment and distribution. In order to. overcome this difliculty and to provide a bag which is very inexpensive I have combined a body portion of paper or the like with a bottom portion of flexible strong material, preferably cloth or fabric but not necessarily so. It is to be understood, however, that I am not to be restricted to cloth per se as other flexible materials may be advantageously used, provided such materials are inexpensive, relatively strong as compared to the paper body, and easily folded.

Heretofore the demand for a strong container has been met by supplying cardboard cartons which are much more expensive than paper bags. In thepresent instance the composite bag of paper and cloth can be made up with any desired strength. That is, relatively heavy unbendable paper can be used with a cloth-bottom the total cost being considerably under that of a cardboard carton.

Figure 4 is a? plan view of the bag blank with the bottom portion attached thereto.

Figure 5 is asectional View similar to Figure 3 of a modification; and

Figure 6 is another perspective View similar to Figure 2 of a modification.

Referring now to the drawing, it will be seen that the body portion of the bag is made from a blank consisting of a front portion I, rear portion 2, side portions 4 and 5, side portions 3 and 6, the side ,portion 3 having a ap 1 which is pasted or otherwise secured to the side portion 6. TheA crease lines I2, [3, I4, I5, I6, I1 andI8 separate the various portions and permit the bag to be folded in afiat condition. The small flap 8 shown in Fig. 4 extends upwardly from the rear portion 2 and is designed to be folded outwardly as shown more clearly in Fig. 3. Flap To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims; the annexed drawing and the following description setting forth in detail one product constituting, however',

but one of the various applications of the prin-` 8 is integralwith the body 4portion and subsequent to the attachment of, flap 1 on the side ofthe bag, the flap 8 is turned outwardly away from the opening of the bag to cover a Fig. 3.

Flap 8 is integral with the bodyportion and` subsequent to the attachment of flap 1v on the side of the bag, the flap 8 is turned outwardly away from the opening of the bag to cover a soft metal strip II as shown, or it may be folded inwardly (not shown).

The bottom portion 9 of relatively strong flexible material such as fabric or cloth is preferably secured to the paper blank by a line of stitching I0. It is to be understood, however, that this bottom portion 9 may be secured 'to the body portion by pasting, stapling, or where an extremely tight construction is desired, the bottom portion will be adhesively secured to the body portion as well as being stitched thereto.

The bag is preferably made by attaching the bottom portion 9 to the paper blank while said blank is in a'flat condition. The next step is to then attachthe flap 1 to the side portion 6 which can be done in any desired manner such as pasting, stitching and the like. After pasting flap 1, side portions 4 and 5, side portions 3 and 6 are folded inwardly leaving exposed only rear portion 2 and front' portion I. Subsequent to the placing of the side portions in and leaving exposed only front-portion I4 and rear portion 2, the bottom stitch 40 ismade, thus closing the bottom. The flap 8 is then turned outwardly and over the metal strip I I leaving flap 8 enclosing metal strip II upon the rear portion 2, and the bag is complete ready to receiveits contents. 'I'he step of filling the bag is rendered quite easy because of the provision of the flexible bottom into its proper shape. It should be noted that a bag having a paper bottom cannot be as easily lled as my bag, because paper folds or creases do not readily expand.

In the method just described I have stated thatthe flap 8 is turned outwardly and downwardly over the metal strip l l after the flap l has-been attached to the side portion but it will be understood that this step may be taken prior to pasting the flap l to the side portion In the modication shown in Fig. 5 the top portion is intended to be stitched or stapled and where ne material, such as sugar, salt and. the like, are contained in the bag, the flapsZ and 2l both projecting downwardly, form a valve which prevents sifting of the material. This is especially important where a paper bag is employed as care must be taken with the stitching because if the stitches are too close together the upper portion will become detached from the lower portion and lf the stitches are too far apart the material will sift through. The provision of these flaps renders Athe exact placement of stitches relatively unimportant as long as they are not too close together.

In Fig. 6 I have shown a modiilcation of the bag bottom shown in Figs. l and 2 and in this instance I use crepe paper 9' which is sumciently strong for certain usage and is cheaper than cloth. It will readily unfold and except for the difference in tensile strength and appearance is just as satisfactory as cloth.

It is to be noted that the seams @il and All' of' Figs. 1, 2 and 6 are shown distorted or extending outwardly for purposes of illustration only. In practice, just as soon as these bags have received their contents the bottom portions will present a smooth,plane surface clue to the weight of such contentandthe flexibility of such bottom. Seams t0 and '40 are shown as being stitched but it will, of course, be understood that the seamsmay be made by stapling or pasting.

The crepe paper is, of course, more flexible than ordinary calendered paper out of which bags are customarily made but at the same time has requisite tensile strength to withstand the shocks and strains encountered in shipping.

It will now be seen that I have provided a bag which is suitablef to receive. pro'ducts such as sugar. salt, rice, etc. and-one which can be handled quite carelessly because the body portion can be made of very strong inflexible paper, whereas the bottom portion is made of a still stronger material which is easily folded thus providing the requisite strength in all portions of the bag.

It will also be seen that a wide choice of bag strengths is provided as the body of the bag may be made of any grade or thickness of paper depending upon the product that is to be shipped.

It will further be seen that the cost of a strong bag is markedly reduced since paper comprises about 90% of the composite bag which holds the cost to a minimum, yet therels no limitation upon the strength or thickness .of paper.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims, or the equivalent of such, be employed.

I therefore particularly point out and distinctly claim as my invention:

l. A bag of the character described comprising front, rear and side portions and a bottom portion, said front, rear and side portions being composed of relatively stiff, single ply paper and said bottom portion being composed of a material that is more flexible than ordinary calendered paper but which possesses requisite tensile strength, said bottom being closed by uniting said front and rear portions with a part of said side portions folded therebetween.

2. A bag of the character described comprising front, rear and side portions and a bottom portion, said front, rear and side portions being composed of paper and presenting substantially smooth at surfaces, said bottom portion being composed of a material that is more flexible than ordinary calendered paper but which possesses Yrequisite tensile strength, said bottom portion being stitched to the interior surfaces of said other portions, said bottom being closed by uniting said front and rear portions with a part of said side portions folded therebetween.

3. A bag of the character described comprising front, rear and side portions and a bottom por'- tion, said front, rear and side portions being composed of paper and presenting substantially smooth flat surfaces, said bottom portion being composed of a material that is more fiexible than ordinary calendered paper but which possesses requisite tensile strength, said bottom portion being adhesively secured to the interior surfaces of said other portions, said bottom being closed by uniting said front and rear portions with a part of said side portions folded therebetween.

4. A bag of the character described comprising front, rear and side portions and a bottom portion, said front, rear and side portions being composed of relatively stiff, single ply ordinary calendered paper and said bottom portion being composed of crepe paper, said bottom being closed by uniting said front and rear portions with a part of said side portions folded therebetween.

. 5. A bag blank comprising a front portion, a

rear portion, an overlapping portion and side portions, all of said portions having interior and exterior surfaces and lower edges that extend in a singleline and being formed of one integral piece of single ply paper, there being a strip of fabric material attached to said interior surfaces and coextensive withsaid lower edges.

JOHN F. AMES.