US2189847A - Adapter for valve bags - Google Patents

Description

Feb. 13, 1940. A. J. VERWY S ADAPTER FOR VALVE BAGS Original Filed Oct. 14, 1936 fmventor.

Anonaw T. Vanms.

Gttomeg,

Patented Feb. 13, 1940 ADAPTER roa VALVE mos Andrew J. Verwys, ilswego, N. 12., assignor to St.

Regis Paper Corn New York, N. Y a corporation of New York Application October 14, 1936. Serial No. 1%,548 Renewed June 22, 1939 42 Claims. (01. 22982.5)

This invention relates to valve bags, and to novel and simple means for controlling the pneumatic filling of the bags, as well as obviating subsequent leaking or sifting of the contents of the bags through the valves.

This invention has particular relation to important improvements in the adapters for valve' bags shown and described in my former patents numbered 2,031,915, dated February 25, 1936, and

any of the contents of the bags from entering and passing through the valves during and after the filling operations. This leaves the passages through the valves substantially empty and the inner ends closed without resort to the forma- 5 tion of the bulky weddings of crumpled fiber, as taught by said former patents.

An important improvement of the present adapters over those of the said patents consists 2,034,217, dated March 1'7, 1936. of creating a circular pocket that substantially 10 The primary object of this invention like my surrounds the main valve body -as well as the former patents, is to prevent the supercharging adapter within the body, and into which there of multiply valve bags, for example, during the is a constant feed of the powdered contents of filling operations, with an excess of pressure that the bags during the final filling periods that tends tends to unduly inflate and distort the bags beto expand the adjacent parts immediately below 15 valves yond the extent normal to the proper filling thereof, and the clogging and sealing of the following the filling operations, by crumpling certain parts of the adapters, and then stuifing the same into the normal valve openings to prevent leakage or sifting.

The adapters of said patents, as well as, of the present case comprise flexible or pliable and tough fibrous elements, having generally the form of fiat or collapsed tubes, that are normally partially split at their bottom edges, and which may be telescopically and permanently inserted in the filling openings or valves of the bags, before or after the bag ends are sewed or pasted; the adapters of both styles of valve bags being preferably made from common blanks, and having their outer end portions pasted to the corresponding inner surfaces of the valves, while their opposite or inner ends preferably project beyond the inner ends of the valves and remain loose throughout the filling of the bags. This enables the main 'bodiesof said adapters to freely expand and contract with the valves when the filling pipes are inserted thereinto provide substantially free V-shaped vents between the pipes and the adapters for the escape of any excess or accumulated pressure, which may bleed away through the hushed valves while the bags are being filled.

After the bags are filled, the filling pipes are withdrawn, and at the start of the withdrawal movements, hooks or grappling means formed at the tips of the pipes engage a free and unpasted crotch, which defines and separates the protruding ends or wings of the adapters, that extend inwardly beyondand aline with the inner ends of the valves, and draw or push said wings back with a slight puckering, towards and across the inner ends of the valves, and in so doing, the loose upper wings are partially crumpled to prevent the stitches. Another important improvement consists of forming weakening slits in the protruding integral wings parallel to the axis of the filling spout, instead of being perpendicular to said axis, as shown in said patents.

The filling pipes are usually cylindrical with pointed free ends, which permit the bags to be placed over the pipes with ease, by holding them with one hand. When a bag fitted with this modified adapter is disposed over a spout, the valve and adapter take the form of the pipe at their tops, while their bottom portions assume the normal diamond-shape of the valve openings.

This new adapter supplants the corresponding parts of both my former patents, wherein the adapters are designed especially for providing relatively bulky crumplings which are created by the hooks or teeth of the filling spouts and are dragged part way through the valves to co-act with said circular pockets to clog and prevent the escape of the contents of the bags, as explained. The supplanting of the perpendicular weakening slits by the parallel slits of the present adapters, the slight crumplings of the crutches which tend to slightly pucker the upper and lower wings, prevents them from bodily entering and packing the passages of the valves, as shown in said patents, but the disposing of the said upper wings across the gaping inner ends of the valve openings, also affords a buffer against which the larger lower wings may be crowded by the contents, and forms a substantially circular pocket into which portions of the contents of the bags are forced by the loading pressure during the final filling of the bags, and which efiects the perfect sealing of the valves, as shown in Fig.

6. When the material is forced towards thevalve corner of the bag, it lifts the adjacent innermost sheet or ply of the valve to which the adapter is pasted, thus making a V-shape of the the adapter which closes the valves tighter and tighter, in case the loaded bags are shipped on cars or trucks, or when the bags are stacked in storage.

I attain these objects by the means set forth in the detailed description which follows, and as illustrated by the accompanying drawing, in which-' Figure 1 is a diagrammatical plan of the common blank from which the adapters may be formed prior to their insertion in the bags. Fig. 2 is a view showing the folding of the blank for insertion in a sewed bag. Fig. 3 is a fragmentary sectional view, taken on line 3-4 of Fig. 4, showing the adapter in the form of a flattened tube inserted in the valve. Fig. 4 is a broken elevation of a sewed bag with the adapter of Fig. 2 operatively disposed in the valve. Fig. 5' is a central vertical section also taken on line 1-3 of Fig. 4, showing the pipe being withdrawn and in the act of lightly crumpling and folding the free end of the adapter. Fig, 6 is a broken side elevation of the bag after it has been filled and the filling pipe removed, showing the two upper and lower wings loosely crumpled and'distributed v throughout the extent of the valve opening to prevent leakage of the valve, also showing the powdered contents ll partially filling the circular pocket 13 that surrounds the adapter and presses the several wings towards each other to seal the inner open end of the adapter.

In the drawing, Figs. 3 to 5 inclusive, show similar broken fragments, as 2, of a sewed bag,

the stitches being indicated at 2', and the tube of the bag being folded inwardly at one corner in the usual manner to form the normally open valve A.

The means for controlling the pneumatic fillin Y of the sewed bag 2, as well as obviating the sifting or. leaking of the contents of the bags, consists of a novel and simple pliable adapter or element. preferably in the form of a substantially flat crinkly paper tube, as 3, which may be telescopically and permanently disposed in the valve A.

either before or after the valve end of the bag is sewed: the said adapter having its outer portion pasted to the corresponding adjacent mouth of the valve, as shown at '8'. The present adapter is preferably formed from a peculiarly shaped standardized blank, as 4, shown diagrammaticaly in Fig. 1. which when folded upon a central crease 4' and upon a parallel lateral crease la, produces the reinforced adapter or bushing 8; the said lateral crease defining an integral oblong fiap or wing 5, that is foldable upon and,

pasted to the adjacent web I of the blank and combining with the two plies of the body, to produce a substantially perfect flat tube, as shown in Figs. 3 and 4; the said body being formed near its free end with similar weakening slits 8 and 8' that parallel the axis of the filling pipe 1, whose purpose will be explained later on. In Fig. 4

- the valve A and also the adapter 3 are shown expanded so as to facilitate the proper and quick insertion of the pipe I, by which the filling of the bag is eiiected, usually by the aid of a strong air pressure.

The pipe I is of the usual type, that is formed at its underside with a relatively long tapered p ning 1' through which cement, lime or other pulverized or granulated products may be blown downwardly into the bag. The free end of the pipe I is preferably formed beak-shaped, and adiacent its tip, said end is also formed with an material that exerts pressure upon the wings of upstanding tooth or hock 8, that faces the mouths of the valve and adapter 3. During the filling operation, the pipe I is usually inserted in the valve to the extent shown by dotted lines in Fig. 3. When the bags are loaded with the material IS, the pressure is shut off and pipe I is withdrawn from the valve A,.and at the start of this movement, the book 8 engages a crotch 9 of the free end of the adapter, and slightly crumples and draws the crotch portion towards the inner end of the valve, as at 8' in Fig. 5, and in so doing, causes the free end to telescope the valve and the pasted end of the adapter, until the hook becomes free. This leaves the mouth of the valve substantially free of the bulky waddings of the said patents.

The hook 8 on the filling pipe that engages and draws the crotch 9 towards the adjacent opening of the valve, is formed with a vertical shoulder l about one sixteenth to one eighth of an inch in height (seeFig. that induces a cam action, which enables the adapter 3 to release itself from the vertical tooth l0 after the short upper wingsare puckered, and the lower wings l2 are pulled or moved towards each other to prevent the contents of the bag i passing between said lower wings, as shown in Fig. 6.

When the crotch 9 at the top of the adapter is puckered, it causes the wings i2 to come together, but the resistance is too great for the hook or tooth 8 to turn back the adapter within ,itself, but it rides upwardly over the face Ill of the hook, because the bag is being discharged from the pipe I, and when the bag drops down clear of the machine, the material IS in the bag pushes the puckered and closed wings l2 up to the top of the circular pocket l3 to make the desired seal. I

The blank 4 of thepresent adapter is made from less paper than my former ones, and as the same is not dragged through the valve, it will make a neater bag end.

It requires a leftward movement of the bag on the spout I, to effect the engagement of portion ill of the hook with the crotch 9, and the valve being located at the extreme upper right corner of the-bag, after a short movement, tends to sag at the lower left corner (see Fig. 5), and the pipe being stationary during this semi-rotary movement, the discharging bag, pivots at the point of engagement of the hook 8 and the crotch, but

this leftward saging of the bag enables the crumpled portion of the crotch to slide up the vertical face or edge ID of the hook, and thence over its curved top III, that frees the bag from the clutch of the hook and crotch, which ends the filling and sealing cycle.

When a filled bag is being removed from the spout I, the hook or tooth 8 draws along the inside of the sewed top of the bag until it encounters the crotch 9 of the adapter and puckers and draws the crotch portion towards and past the mouth of the valve until the spout is freed from the bag. The parallel weakening slits enable the upper and lower angular wing portions '2 and I 2' formed by the hook'to finally come together to prevent leaking or sifting at the end of the filling periods, as shown at X in Fig. 6

The pocket I! begins at the inner'end of the valve A, and thence exte'nds between the upper and lower wings l2 and I2 and the unpasted portions of said wings; thence towards the right until it is stopped by the pasted outer ends of the adapters. This, owing to the stiflness of the valve stops the outward progress of the material ll,

and immediately begins to exert a pressure that forces the lower wings l2 transversely to bring said wings into overlapped contact, to effectually seal the opening through the valve and prevent 5 any of the powdered material from finding a free passage through the valve towards the mouth of same. I

, Having thus described my invention, what I claim, is-

1o 1. An adapter for valve bags composed of a tubular member for securement at its outer por tion to the mouth of the valve, said member having sides provided with slits that extend longitudinally thereof and through the front ends of 15 the sides of the member, and having portions of its sides extending downwardly and outwardly at an angle and terminating at points below the slits, whereby upon outward movement of the front of the member and of the valve by engagement 20 with a projection on a filling pipe, the sides of and terminating at points below the slits, whereby upon outward movement of the front of the member and of the valve by engagement with a projection on a filling pipe, the sides of the member the sides of the member, and having portions 15 of its sides extending downwardly and outwardly at an angle and terminating at points below the slits, whereby upon outward movement of the front of the member and of the valve by engagement with a projection on a filling pipe, 20 the sides of the member above the slits will be puckered and the sides below the slits will be moved toward each other into overlapping relation. r

4. An adapter for valve bags composed of a $5 sheet that, when spread flat, is substantially rectangular in shape with a V-shaped notch in one side and 'with a slit running from each side of the notch and substantially parallel with the .ends of the sheet, the ends of the sheet being secured to- 30 gether to form a tubular member.

ANDltEW J. VERWYS.

Images