US2031915A - Adapter for valve bags - Google Patents

Description

Feb. 25, 1936. A. J. VERWYS ADAPTER FOR VALVE BAGS Filed Aug. 14 1934 iimaentor. Auunzw 3', Vznwws.

attorney Patented Feb. 25, 1936 UNITED STATES PATENT OFFICE ADAPTER FOB VALVE BAGS Andrew J. Verwys, Oswego, N. Y.

Application August 14, 1934, Serial No. 739,725

6Claims.

r 10 frequently unduly inflates and distorts or balicons the bags beyond the extent normal to the proper filling thereof; the said preventive means comprising flexible fibrous adapters or elements,

- having the form of split tubes, which may be 15 telescopically and permanently inserted in the valve openings, before or after the bag ends are sewed or pasted; the adapters for both styles of valve bags being made from common blanks, and having their outer end portions pasted to the cor- 20 responding poftihns of the winner surfaces of the mouths of the-vaives, while. their inner or opposite ends preferably remain loose, and the whole of said adapters being free to expand with the valves when the filling pipes are inserted there- '25 in, and therefore occupy the usual spaces between the inner walls of the valves and filling pipes,'

' 35 formed on the tips of the pipes engage the free or unpasted ends of the fibrous adapters and draw said ends back towards the mouths of the valves, and in so doing, these loose ends are crumpled and caused to virtually telescope the pasted ends 40 until the hooks, owing to the increased resistance oifered by said pasted ends, tear the fiber and come free. This leaves the'passage through the valves substantially clogged with waddings of the crumpled adapters, which not only effectually 45 prevent subsequent sifting or leakingof thecontents of the bags, but also obviate all danger of atmospheric moistureenterlng the filled bags and impairing the quality and destroying the usefulness of the various commodities with which the 60 bags are loaded.

I attain these objects by the means set forth in the detailed description which follows, and as illustrated by the accompanying drawing, in which- I 55 Figure 1 is a broken side elevation 01' the valve end of a sewed bag, folded to form the valve. Fig. 2 is a broken vertical section, taken on line 22 of Fig. 4, showing the adapter in the form of a fiattube inserted in the valve. Fig. 3 is a central vertical section, taken on line 2-2 of Fig. 4, showing-the filling pipe being withdrawn and in the act of crumpling the free end of the adapter. Fig. 4 is a broken elevation of a sewed bag, with the adapter of Fig. 13 operatively disposed in the valve. Fig. 5 is a broken side eleva- 'tion of a sewed bag after the same has been filled, and the filling pipe removed, showing the wadding of the adapter left in the mouth of the bag. Fig. 6 is a central vertical section through the valveof a pasted satchel form of bag, and a 15. broken sectional view of the filling pipe, taken on line 66 of Fig. 7, showing the pipe in the act of being withdrawn from the valve and effectfng the initial crumpling of the adapter of vFig. 14. Fig. '1 is a-broken end elevation of the pasted bagwith the adapter bushing the valve, and a cross-sectional view of the filling pipe. Fig,

8 is a plan view, showing the initial folding of the pasted bag blank, the valve flaps being ex tended, also showing the broken lines along which said flaps may be folded to complete the valve. Fig. 9is an enlarged plan view showing the valve fiaps disposed at right angles to the bottom of the valve, and the adapter of Fig. 14 resting on the bottom between the fiaps. Fig. 10 is an enlarged elevation taken in the direction of the arrow in Fig. 9'. Fig. 11 is an enlarged broken plan view,

showing the valve fiaps folded inwardly, overlapped and pasted; also showing the wadding of the adapter protruding from the mouth of the valve, following the withdrawal of the filling pipe. Fig. 12 is a diagrammatical plan of the common blank from which the adapters may be formed prior to their insertion in both the sewed and pasted bags. Fig. 13 is a view showing the folding of the said blank for insertion into the sewed bag. Fig. 14 is a view of a different folding of the blank for insertion in the pasted bag. And

Fig. 15 is a vertical cross-section, taken on line lb -l5 of Fig, 3; showing the natural flare of the wings to provide free escape of the accumulated air pressure from the bag during the filling thereof.

The bags referred to herein, are invariably made by high-speed" machinery, from fiber ,tubescomthroughthe .valves are of too small caliber, and

this causes the air pressure by which the various products are forced into the bags, to accumulate in and unduly expand or balloon the bodies of 4 the bags, which not only slows down the filling,

but strains and so alters the shape of the filled bags, that they will not stack properly and evenly when stored and transported. On the other hand, in many of the bags the valve openings are too'large, and this results in the too free escape of the air around the filling pipe that carries with it more or less of the finely pulverized products, which not only become wasted, but litter up the vicinity of the filling stations. The following description points out novel and simple means for 2 overcoming these and other defects in both the sewed and pasted bags: I

In the drawing, Figs. 1 to 5 inclusive, and Fig. 15, show similar broken tubular fragments, as 2, of a sewed valve bag, the stitches being indicated at 2', and the tube being folded in the'usual manher to form a normally open valve, as A, shown in Figs. 2, 3 and 4. This type of valve bag is preferably formed with lateral tucks,'one of which, as 2a, plays an important part in the manufacture of the well-known Bates valve bags,. wherein the top of the valve opening is'virtually defined by the stitchings 2'.

The means for controlling the pneumatic filling of the sewed bags 2, as well as obviating the subsequent sifting or leaking of the contents of the bags, consists of a novel and simple flexible element or adapter, preferably in the form of a fiat crinkled paper tube, as 3', which may be telescopically anti permanently disposed in the valve A, either before or after the valve-end of the bag is sewed, as shown in Figs. 2, 3 and 4, the said ele-- ment having its outer end portion pasted to the corresponding portions adjacent the mouth ofthe valve, as shown at 3a in Figs. 2, 3 and 13. adapter 3' is preferably formed from a peculiarly shaped standardized blank, as 3, shown diagrammatically in Fig. 12, which, when folded upon a central'crease 31), produces the adapter or bushing 3', of Fig. 13, the latter being formed near its free end with a weakening slot 30, and with transverse weakening slits 3d, whose purposes will be explained later on. In Fig. 4, the valve A, and also adapter 3', are shown partially expanded, so as to facilitate the properv and quick insertion of the pipe, as 4, by which the filling of the bag 2 is effected, usually by the aid of a strong air pres-- sure. The pipe 4 preferably tapers from its midj dle towards its free end 4, and the under side of this portion is formed with a relatively large clear downwardly facing opening 4a, through which cement, lime or other pulverized or granulated products may be blown into the body 2. The end 4' of the pipe 4 is preferably formed beak-shaped, as at 4b, to further aid in its insertion, and adjacent its top said end is also formed with a tooth or hook do, that faces the mouth a of the valve and adapter. During thefilling operations the pipe' 4 is usually inserted in the valve to the extent shown by dotted lines in Figs. 3 and 6. When the bags are loaded with a predetermined'amount of material, the pressure is shut off, and the pipe 4 is withdrawn'from the valve, and at the start of this The causes said free end to telescope the pasted end of the adapter until the hook finally tears the fiber and comes free, the slits 3d facilitating crumpling. This. leaves the mouthof the valve clogged with a. -wadding 3a of the crumpled adapter, as shown in Fig. 5, which efiectually prevents sifting of the contents of the bag, as well as the infiltration of atmospheric moisture, through the valve opening, as explained.

. When the bags are placed erect in the loading position of Fig. 3,they are relatively light and entirely free from restraint of any nature. As the filling of the bags progresses, the weight of the load creates a downward strain on the whole bag that acts to take up the normal slack throughout its entire length and tends to contract the normally free valve opening, and this results in the bag becoming supercharged with the accumulated pressure, that effects the ballooning of the tube,

which the present invention is designed to wings a:, free to'fiex and gape, as shown in Fig. 15,

and thus provide aclear and ample opening that serves to bleed off, to the atmosphere, any accumulated pressure, that might otherwise effect the over-expansion of the bag 2 through the adapterbushed opening of the valve, as hereinabove referred to.

The multiply bags'referred to herein are formed from relatively heavy and stiff sheets of jute fiber, which require deft handling in order to effect the several short folds of the valves. It is characteristic of most of these bags, that the valves immediately after being formed tend to gape, as shown somewhatexaggerated in Fig. 4, and this tendency persists to a considerable extent even after the bags are filled, andhas been found to be the primary cause of much of the sifting through the valvesas A and B. To remedy this defect or fault, the newly made bags have heretofore been passed between press-rolls, which temporarily flatten the folds of the valve parts, reduce the extent of the gaping, and therefore lessen the danger of leakage in which condition the valves remain until filling work begins. It develops, however, that the filling, which is effected pneumatically, acts to expand the bags in all directions, and'in so doing, tends to enlarge the valve openings and renew the danger of sifting, or the infiltration of atmospheric moisture which often impairs the quality and destroys the usefulness of the contents of the bags. From the foregoing, it appears that this type of paper bags lacks any inherent quality or means to prevent either the escape of the contents, or the entrance of moisture, and that the several faults or defects complained of can only be remedied by the use of the present adapters, or other auxiliary elements that will act to supplement the normal combination of parts of the present day valve bags.

In Figs. 6 to 11 inclusive, are shown the usual steps by which a plain pasted satchel fold valve bag. as 5, is constructed, in which Fig. 6 is a central vertical section of the broken valve-end of the bag, 5, taken on line 6,6 of Fig. 7, which is an end elevation and partial vertical crosssection of the same. Fig. 8 shows the primary treatment of the tube 'i, which consists of folding 2,081,915 inwardly a corner portion to form the bottom 5a of the pasted bag, as B. The next step consists of creasing the extended parts in the direction 'of the long way of the valve, as at 51;,

to form right and left flaps, as Sc-fid, which are ultimately folded towards each other, overlapped and pasted, as shown in Fig. 11, to complete the formation of the valve B. The flap 5d is shown treated with paste, as by the stippling 5e, to effect the adhesion of the flaps. Immediately following the creasing of Fig. 8, the flaps 5c-5d are preferably flexed upwardly at right angles to the bottom 5a of the valve, as shown respectively in plan in Fig. 9, and in elevation in Fig. 10. When this partial folding of the flaps is effected, the adapter 6 with paste applied, as at 3a, to its outer end is disposed flat upon the bottom of the valve, as shown in Figs. 9 and 10, in readiness to be permanently attached to the mouth of the valve, when the flaps are finally folded as shown in Fig. 11. The adapter 6 is preferably formed from the standardized blank 3, which when folded inwardly along the parallel creases 6', produces the adapter of Figs. 9, 10 and 14. In Fig. 7 the valve B and also the adapter 6 are shown fully expanded by the filling pipe 41:, by which the bag 5 may be filled, as explained.

The filling pipe do: is in all respects of the same.

construction and performs the same functions as the pipe 4, and when the filled bag is removed from the pipe, the latter acts in exactly .the same way upon the adapter 6, and. when the pipe 4.1: becomes free from the adapter, the crumpled portion of the adapter protrudes from the mouth of the valve, as indicated at 6a: in Fig. 11'.

Having thus described my invention, what I claim, is

1. A valve bag for use with a filling pipe prothe adapter will move therewith and be crumpled and disposed in the mouth of the valve to close same, said adapter having transverse weakened portions to facilitate crumpling.

2. A valve bag for use with a filling pipe provided with a hook or the like, having an adapter folded upon itself and secured at the sides of its front'portion to the valve and having an upwardly facing slot extending through its folded portion adjacent the inner end of the latter, to receive said hook whereby upon withdrawal of the pipe the adapter will move therewith and be crumpled and disposed in the mouth of the valve to close same.

3. A valve bag for use with a filling pipe provided with a hook or the like, having an adapter secured adjacent its outer end to the valve and. having its inner end free, and means formed intermediate the ends of the adapter to engage said hook whereby upon withdrawal of the pipe, the adapter will move therewith and be automatically crumpled and disposed in the mouth of the valve to close same.

4. A valve bag for use with a filling pipe pro-. vided with a hook or the like, having collapsible closure means for the valve associated therewith, said closure means having a part formed to engage the hook and having weakened portions whereby upon withdrawal of the pipe the closure means will move therewith and be automatically collapsed to fill and close the mouth of the valve.

5. A valve bag in accordance with claim 4, wherein the closure means has sides secured at their outer ends to the valve and having inner ends which incline upwardly and inwardly of the bag.

6. A valve bag in accordance with claim 4, wherein the closure means is composed of a member folded upon itself to form a top and having the resultant sides secured at their outer ends to the valve, and having inner ends which incline upwardly and inwardly of the bag.

ANDREW J. VERWYS.

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