US2415862A - Valved bag and method of manufacturing it - Google Patents

Description

Feb. 18,1947. 3, BELCHER 2,415,362

VALYED BAG AND METHOD OF MANUFACTURING IT 2 Sheets-Shet 2 Filed March 17, 1944 PIC-3.8.

FIG]

Feb..l8, 1947. 'n. BELCHER VALVED BAG AND METHOD OF MANUFACTURING IT Filed March 17, 1944 2 SheetsShe et 1 04 Immu- I J 14%.. ,7

- claims. I

tensionlessbag showing the thereto;

I J Daniel Belcher,

Bemls Bro. Bag Com I I 2.415.852]v "vatvnn naej wil .v asslgnor to i corporation of m y I a plication rch yr, 1944, seria -52875 v This invention relates to valved bags, and to a.

- method of manufacturingthem, and with regard to certain morespecific features, to sift-proof ba valvesof the sleeve-lined, tucked-in flap type.

The invention is an improvement upon the in- I 4 othermodification; and,

ventions disclosed and claimed in two United States patent applications-namely; Serial No.

526,910, filed March 17, 1944, by William R. Wood, 'forvalved bagsand'method of manufacturing them; and Serial No.'526',911, filed March 1'1, 1944,

' by Gus A.'Bauman, for valved bags and method of mahufacturing them. It is also an improve'-; "ment upon the construction shown'in-United States Patent 1,827,040, dated October 13, 1931.

1 closed has, illustrating the final anaement oi the Fig. 6 species;

Fla. 9 is a plan viewoi Fla. 8, without the cover strip and its stitching;

Among the several objects of the invention may I ,he noted the provision of improved simple'm'eans of attaching a sleeve liner to a bag valve; the provision of attachment means of the class described whichis effective whether or not the bag carrying the valve includes a valve-forming extensionbut particularly when it does-not; and the provision of an attachment means ofthis class which may he efiect'ed at low cost and high rates of pr'oducinlpart'pointed out hereinafter.

Elie invention accordingly comprises"theelements and combinations ofelements, steps. and sequence of steps, features of construction and manipulation, and arrangements of parts which tion. Other objects will be in part ohviousand will he exemplified in the structures and methods hereinafter described, and, the scope of .the application vofwhlch be indicated inthe following In the accompanying d m Wm 11 air? inustrated several'of variouspossible 'embodi-= merits of the invention,

Fig. '1 is a perspective View of a drawn-out, ex

invention applied These fold lines 25, 2V

generally used for later forming and turning in Fig. 2 is a vertical section through a finished and closed has, embodying" the'construction of Fig.1; i

I Fig. 3 iaa view similar to Fig. 1, showing a modifi'ed sleeve attachment;

' Fig. e is a viewsimilar to Fig. 2, but illustrating the mention; I Y 1 his. 5 is a view similar to Fig. 1, showings ether modification;

his. 6 is a view similar-to Fig. fiyshowing another species of the Fig. 5 modification;

Big. 7 13a. fragmentary view similar to the 'riaht=hand portion of Fig. 6, illustrating a subsequent step in connection with the Fig. 6 species;

Fig. 8 is a vertical section of one corner of a 5 during the stretching operation. the above-mentioned side gussets is common and shown. This Fig. 10 is'a view similar some. '6, showing an Fig. 11 is a'diagrammatic view of a sewing ma chine illustrating how an attachment is made,

using the Fig 1' form of the invention, for ex- I ample.

Similar reference characters indicate corre sponding parts throughout. the several views of the drawings. Y Y Y Referring now more-particularly to Fig. 1, there is shownthe corner of an extensionless-gussetedbag l, which has been, stretched out-"in -the directionoi the arrows shown, so as to open out the upper end of one ofthe side gusset portions 5.

The mouth of such a bag is uniformly ina plane at right angles to the length of the bag." The gussetjconsists of three longitudinal creases s, H and it, which'are formed when the tube isformed from which the has material is cut. The

creases 9 and it ultimately form the bag corners,

the shaded corners shown being only temporary forms the sublectmatter upon which the present invention is operative. outward extension from the mouth edge portion 3, but for various reasons it is more economical to make bags lnquantitieswithout such exten-s sions.

Additional folds or creases- 25, 2? and it may he applied before attachment of the valve liner.

shown at ill-and to be described, or the applies-=- tion of these creases may bepostponed until said valve liner has been applied, as willappear.

and 29 are; oi the type a valve nap, causing th material at the upper end of the gusset s to b eak along the proper lines for the purpose.

' At numeral-ll is shown a sleeve-forming in 'To apply this sert or liner of quadrilateral form. liner or insert, the operator, as above stated, stretches out the gusseted corner of. the has: as makes thev adjacent part of the gusset substantially fiat. Against the marginai portion of this fiat portion of the gusset is laid the marginal portion of the sleeve liner or insert i l. This causes the sides of the liner to intersect the mouth edge 3 at corner 2, these sides being at right angles to the mouth edge 3. The oper ator then places the assembly over the horn i a A bag havin Often, sucha bag has an 'shown in Fig. 1.

- is improved.

- tension I4.

atlases of a sewing machine (Fig. 11), and applies stitching 23 in a curved path, starting at one corner or intersection 2 and ending at the other corner or intersection I. The result is the attachment The whole operation is quite simple, since the four fingers of the operator may be inserted behind the corner portions 2 and 4, and the thumbs may hold said corners bag. The non-linear character oi is an important feature oi the invention. allows for dispensing with the extension above-mentione'd, which would be required in order to stitch straight across the insert. By arcuately sewing as described, the sewing machine needle may start in the clear and advance relatively across the edge of the bag at the comer or intersection 2, finally advancing into the clear by traverse across the edge at the comer or intersection pletion of the stitching operation may occur at than at points within material. The latter would nipulation for starting and stopping the seam.

After the sleeve liner has been applied as indicated in Fig. l, a valve flap 3! may be formed of the upper end of the gusset by breaking along.

the crease lines 25, 21 and 29. This is indicated in cross section Fig. 2, is shown as extending outward from the valve flap thus formed. It becomes bent at i2 next to crease l l. The result is a lined valve flap in an extensionless bag wherein the fit of the liner Finally, the bag is closed, along with the upper side of the valve by applying an inverted V-shaped cover strip 45 held in place by means of stitching 41. The bag is then ready for the insertion into the valve of a suitable filler nozzle, by means of which it may be filled. After withdrawal of the nozzle, the outer portions of the sleeve i! may be wedded into the valve nap by pushing the outside portions in the direction of the curved arrow shown in Fig. 2. To facilitate this the liner is made or flexible material such as crinkled or crepe paper. A closed condition of a valve is not shown.

In Figs. 3 and 4, like numerals designate like In this case, however, the sleeve liner is indexed B, and differs from the Fig. 1 iorm in that it incorporates a beveled extension l having slits 8 providing flexible tongues it. As in Fig. 1, ther is no extension formed from the material of the bag per se. In this case, stitching 23 is applied arcuately, as before from intersection or corner 2 to intersection or corner 6. The result is attachment of the sleeve liner to the valve flap at an intermediate region of said liner. Then, when the valve flap is turned in, as indicated in Fig. 4, there will be an inward extension having flexible tongues, and an outward ex- The bag and the lined valve are then closed by means of the stitching 41. After filling and closure, outer extension it may be wedded into the valve. The flexible inward extension"! will tend to move into sealing position within the valve in response to any tendency for the materials therein to escape.

In Fig. is illustrated the point that, although the invention is primarily for use with sleeve liners used in connection with extensionlessbags, it may also be used in connection with bags having extensions. In Fig. 5 the usual-flap extension is shown at 15. Otherwise the numerals correspond to those used in Fig. 1. In thiscase.

c. Thus starting and comwherein the sleeve liner i1 cover tape 55 and although a straight sewn seam could be used, the arcuate seam or its equivalent has advantages. any seam shape which is not a single straight line across the 5 valve. That is, it has a component of seam traverse which is along the ultimate axis of the valve the valve axially at its central portion without stifiening either the or outward extensions therefrom.

- In Figs. 6, '7 and 8 is shown an application of the invention to a bag having an extension it, but wherein the sleeve liner attachment 5| is reversed in its placement with respect to that shown in Fig. 5. The stitching 23 is applied as before, and then the attachment Si is folded down along the line 53, as indicated in Fig. '7. Thereafter, upon forming the valve flap, the result shown in Fig.- 8 is obtained, wherein the flap is again indexed with numeral 31, the closure strip. being shown at 45 held in place by the stitching d1.

It will be clear from Fig. 9 how the stitching has the above-mentioned directional component along the axis of the valve flap. It will be recalled that Fig. 9 is a plan view of a bag valve without the cover inverted, turned-down sleeve liner 5! is that the stitching 23 is guarded thereby against abrasion.

In Fig. ill-is shown the-attachment or an inverted liner attachment (similar to that shown in Fig. 6) to a bag having no extension itself. Such a bag corresponds to those shown in Figs l-4. Prior to tucking in the valve flap in the cas of Fi 10, the attachment is turned down, as above described in connection with Figs. 6

and 7.

Although I have illustrated 'a fairly constant curvature for the are which comprises the locus of the stitching 23, it should be understood that the curvature may vary from beginning to end of this stitching, and also that the locus may even be composed of angularly related straightline portions, preferably arranged concave upwardly with respect to or stated otherwise convex toward the opposite closed end of the bag. The this connection is that the stitching should first be run from one side of the liner attachment where it intersects the bag mouth toward the opposite end of the bag, and then away from it, while at the same time traversing the attachment from side to side, and finally approaching lar to the valve length. This is clear from Figs.

2, 4, 8 and 9.

While angular or curved lines of stitching are equally effective, so far as attachment characteristics are concerned, the arcuate iormis somewhat easier to apply, since the sewing machine operator may continuously advance and turn the bag which is somewhat easier to do than to run a straight line of stitchingandthen making an angular ofiset for a subsequent line of stitching. In the case of a bag with an extension a downwardly concave form couldalso be applied but this is not as convenient, and in any event it could not be used practically in the extensionless forms of Figs. 1, 3 and 10.

A general advantage of sewing the liner attach-' flap-forming parts of the valve is the stitchstrip 45. An advantage of the the mouth of the bag, I

primary point in.

ing not only holds the liner attachment to the bag, but also serves to hold together the multiply layers of the bag to prevent sifting therebetween of material carried in; the bag.

An advantage of the invention is that in addition to making easier a manual application of the sleeve liner, it also makes practicable the devising of automatic machinery for so doing.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained- As many changes could be made in the above 1 having a mouth edge lying uniformly in a plane at right angles to the length of a bag formed ,from the tube, comprising stretching out said attachment to a valve-forming portion of a; tube valve' forming portion adjacent the open month edge of the tube, laying said attachment against constructions without departing from the scope of the invention, it is intended that all matter con-' tained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

1 claim: I n

1. In a valved bag, tucked-in valve flap extending inwardly into the mouth ofthe bag, said flap being formed from a'portion of said mouth, said mouth prior to the tucking-in of the flaplying uniformly in a plane at right angles to the length oi the bag, said flap being fo'rmedby folding in wardly a portion of the adjacent bag wall, a sleeve liner in said valve flap having a portion arcuately stitched to the inwardly extending wall the stitching prior to turning in the flap lying substantially in the plane of the bag mouth where intersected by the sides of the sleeve liner, andinwardly afterthe arc of stitching being concave the flap is turned in.

- portions of said-valve flap, the terminal points of 2. The method of applying a sleeve-forming said stretched-out valve-forming portion with the sides or the attachment extending from andlying at right angles to said mouth edge, and applying a line of connecting stitching through the attachment. and the valve-forming portion so that the locus of the stitching is convex said mouth edge of the tube, the ends of s connecting stitching lying at the intersection of attachment.

said mouth edge and the 3 essences cram Thefollowing references are-of record in the file of this. patent:

p "t Number- Name -Date 907.557 'Bates Dec. 22, race 1,852,026 'Redington Apr. 5, 1932- 1,783,624 Menke et al Dec. 2, 1930 2,275,505 Crawford et al-.--.. Mar. 10, 1942 1,993,377 McNulty\ Mar. 5, 1935 2,148,648 Rose Feb. 28, 1939 I FoR IGNPA Number Country Date 358,454 British Apr. 4, 1930 307,483

British Mar. 11, 1930 L y Certificate of Correction Patent No. 2,415,862. February 18, 1947. DANIEL BELOHER It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Column 5, line 19, claim 1, before tucked-in insert the article a; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 2nd day of September, A. D. 1947.

LESLIE FRAZER,

F ii'st Assistant Commissioner of Patents.

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