US2406660A - Bag - Google Patents

Description

Aug. 27, 1946.

C. V. BRADY Filed Jan. 24, 1944 Patented Aug. 27, 1946 BAG Charles V. Brady, Webster Groves, Mo., assignor I to Bcmis Bro. Bag Company, St. Louis, Mo., a corporation of Missouri Application January 24, 1944, Serial No. 519,566

1 Claim.

1 I This invention relates to bags, and with regard to certain more specific features, to a composite bag and cover construction.

Among the several objects of the invention may be noted the provision of a more convenient bag and cover combination which may be handled as a single unit during transportation to, and during filling operations by, the packer; the provision'of an article of the class described which eliminates the necessityfor the packer telescoping' a filled bag with what has heretofore been called its overslip; the provision of an article of the class described in which the cover not only protects and strengthens the bag after filling and closing, but also protects the empty bag before filling and strengthens it during filling; the provision of an article of this class which adds to the strength of the bag when finally covered and .which reduces sifting from, and leakage into the bag; and the provision of an article of this class which is more economical than the separate bags and overslips heretofore used. Other objects will be in part obvious and in part pointed out hereinafter. I v

The invention accordingly comprises the elements and combinations of elements, features of construction, and arrangements of parts which will be exemplified in the structures hereinafter described, and the scope of the application of which will be indicated in the following claim.

In the accompanying drawing,.in which are illustrated several of various possible embodiments of the invention,

Fig. 1 is a plan view of one form of the invention shown in empty condition; 7

. Fig. 2 is an enlarged brokensection, line 2-2 of Fig. 1;

Fig. 3 is a vertical section similar to Fig. 2 but showing a complete closure of the bag and cover;

Fig 4 Ba detailed front elevation of an upper right-hand corner of the bag of Fig. 3, parts being broken away to show interior arrangements;

Fig. 5 is a view similar to Fig. 1, but showing a fragmentary upper end and illustrating an alternative construction;

Fig. 6 is an enlarged detail section taken on line 6-6 of Fig. 5; and,

Fig. 7 is a plan view of the Fig. 5 construction as filled and closed, parts being broken away to show interior arrangements.

Similar reference characters indicate corresponding parts throughout the several views of the drawing.

Heretofore it has been the practice to employ protective overslips for bags but to make the bags separate from the overslips. The packer of the bags received them separately from the taken on overslips, which was unhandy. He then filed the bags and closed them or their filler valves. They were then telescoped into the overslips and the latter closed. The overslips were, prior to loading, provided with bottom seams and were longer than the bags, which in eifect made of the overslips outside protective bags. The general purpose was to place the main protective characteristics (strength, moisture and abrasion resistance) in the overslip, while the inner bags were designed primarily for easy filling. To facilitate inserting in the overslip, the inner bag was necessarily smaller in girth than the overslip and consequently took all of the stress exerted by the contents. The inner bag therefore required conslderable strength. In spite of this, it often broke during the rough handling in packing. Since the overslips were made longer than the unfilled bags to enclose them end to end when filled, without any provision thereafter for eliminating slack space in the bags, a. slack package resulted.

Referring now more particularly to the drawings, my improvements on the above will be described. Referring to Fig. 1, numeral I indicates a fiat, tubular bag having lateral V-shaped, expansive gussets 3. This bag may be single-ply or multi-ply as desired. At its upper right-hand corner it has an inturned portion 5 forming a self-closing. valve. The valve may be any of known types for the purpose. At its outer end the bag is closed by means of a V-shaped cover strip 1 sewn in place by stitching 9. The valve 5 will admit of the insertion of a filler tube II, indicated by dotted lines.

At numeral I3 is shown a tubular cover, preferably made of multi-ply material open at its upper end I5. For strength a layer of fabric usually forms one ply of the cover. Before delivery to the packer, and while the tubes I and [3 are flat, the bag manufacturer telescopes the two sleeves I' and I3 to the extent that the bottom edge I! of sleeve I is adjacent the bottom edge I9 of tube I3. At this time the tube I which has an overall flat width less than that of tube I3, is centered laterally in the tube, as shown. Then a V-shaped cover strip 2| is applied over the edges I1, I9 and stitching 23 is applied through 2|, I1 and I9, thus by means of a single seam making a closed bottom for the inner bag I and one for the outer cover I3.

As shown in Fig. 1 the open cover is shorter than the closed bag I, thus exposing the valve 5 for easy subsequent insertion of the filler tube by the packer. The unitary flat assembly of bag and cover is delivered flat to the packer, as illustrated in Figs. 1 and 2. The packer inserts the tube I I in exposed valve 5 and fills the bag. This causes it to expand, the gussets 3 stretching. The girthwise perimeter of the bag I and that of the cover I3 are proportioned so that as the bag fill out, the cover forms girthwise support against radial forces of the bag contents when loaded, that is, the filled bag fills tht cover. After the filler tube 5 has been withdrawn the valve 5 tends automatically to close in the known manner. Filling of the bag is carried out to a point somewhat below the upper edge [5 of the cover Hi. This leaves slack at the upper end of the filled bag. This allows the closing seam I on the upper end of the bag to be rolled down one.

' pass through the walls of the inner bag and esor more times as indicated at numeral 25 in Fig.

3 and places the rolled upper edge of the bag I beneath edge l5. The packer then applies a V- shaped cover strip 21 and stitching 29, thus closing the upper edges l5 of the cover. The seam thus formed may be dipped into wax 3! or the like for making completely moisture-proof closure. The bottom seam 2|, 23 may also be dipped into wax for waterproofing purposes as indicated at numeral 41 in 2.

It will be understood that the upper edge i5 of the cover may also be closed by other means, such as by tying, metal stapling orthe like. Also, the seam i, 9 at the upper end of the bag I may be a pasted Or other seam, instead of the sewn seam shown; likewise the bottom seam 2i, 23.

The roll .25 takes up the slack at the upper end of bag i, insures permanent closure of the valve 5 and protects the stitching in the seam "I, 9 against sifting out of, or leakage into, the bag. The position of the seam 21,29 of the cover close to the roll insures that the roll will not un- Wrap, and thus permanence of a tight pack condition. The rolled-down top 25 also adds to the strength of the bag closure seam when the bag is filled.

As above forecast, the inner bag I may be designed. more flexible for easy filling and closing, while the outer cover is designed for moisture and abrasion resistance and'strength and may be stifier. Easy filling is also enhanced by the fact that the bag initially extends above the cover to allow easy insertion of the filler tube I.

The invention provides for the packer a single organized unit for application to the filling machinery. He is relieved of the task of telescoping the bag into the cover, this having been done by the manufacturer. At the same time, the use of a single seam for closing both the bottom of the bag and of th cover effects a saving to the manufacturer.

Filling machine operations are oftenquite hard on bags and under the prior art method with the inner bag separately from the cover and applied after filling the inner bag had no outer support during the fillin operation. Thus often under severe handling, breakage of the inner bag would occur during filling. The present invention obviates this by providing the surrounding support of the trong cover during handling when filling. It also protects the bag'before the filling operation.

By means of the present invention tighter girthwise fit may also be obtained between the bag and the cover because there is presented no problem of telescoping the two after the inner bag has been filled. With the prior art process a package which was slack girthwise was necessitated, because the inner bag needed to be when filled substantially enough smaller than the cover to make telescoping easy and commercially practicable. This is in addition to the rolling down of the top of the inner bag and the holding of it by the closure seam 21, 29, which serves to make a tight endwise pack, because material in complete closure by the packer. procedure in this case is the same as that above- A filler valve is shown at 35.

cape from the mouth of the cover before closure of the latter occurs.

It is to be understood that the provision of the valve 5 and the preclosure of the upper end of the bag 1 at I, 9 by the manufacturer is optional; and that the upper end of this bag I may be left valveless and open for filling and Otherwise the described.

In Figs. 5-7 is shown another form of the invention in which'like numerals designate like parts. In this casethe'inner bag l-A has no sideward' gussets. It is therefore made of about the'same width as the cover when the two are fiat, except for the slight difference in width in favor of the cover required by the manufac- 'turer for'telescoping the two at the bag factory. ,Such a bag carries what is called a satchel bottom 33 (herein used as a top) shown in Fig. 6. This satchel part and valve extend from the upper edge I5 of the cover J3 (Figs. 5 and '6'). The lower ends of the bag members |A and cover l3 are'closed by a single seam (not shown) as in the case of construction shown in Figs. 1 and 2. After filling up to a point somewhat below the upper edge l5 of the cover i3, the satchel part 33 is rolled down as indicated at 31 in Fig. '7 and a top seam '39 applied to closing the cover edges i5. In this case, as the inner bag IA is filled, the outer cover, l3 and the bag I-A expand together.

In viewof the above, it will be seen that the several objects of the invention are achieved cover, each being ,of tubular form, certain ends of said sleeve and cover being adjacent one another, a common sewed seam closing both of said adjacent ends, the width of the fiat cover being substantially greater than thatof the flat gusseted sleevewith the latter being centered in the former by said scam, the opposite end of said sleeve extending substantially beyond the opposite end .of said cover, the sleeve being connected to the cover only at said seam and free of any longitudinal attachment thereto, the perimeters of the sleeve and the cover being related so that the sleeve when loaded and without stretching its material :entirely fills out the cover and the latter when loaded forms substantially all of the girthwise support against radial forcesof the bag contents.

' CHARLES V. BRADY.

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