US2418975A - Valve closure flap - Google Patents

Description

P" 1947- H. M. JOHNSON 2,418,975

VALVE CLOSURE FLAP Filed Oct. 5, 1944 Patented Apr. 15, 1947 VALVE CLOSURE FLAP Harold M. Johnson, Toledo, Ohio Application October 5, 1944, Serial No. 557,265

1 Claim; (01. gas-62.5)

This invention relates to automatic closure means for containers as charged with bulk material, more particularly as impelled or blown thereinto. e This invention has utility when incorporated in extension or flap means inward from the intake valve of the foldable or collapsible type as in the pneumatic charging of valve bags with cement, lime hydrate, gypsum, flour, cereals, etc.

Referring to the drawings: v v Fig; 1 is a side elevation, with parts broken away, of a bag in bulk charge receiving position, and having an embodiment of the invention herein incorporated as a flap extension hanging loosely adjacent the spill'or discharge portion'of' the bag filling tube or nozzle, as protruding thru the valve into the bag;

Fig.;. 2 ;is a section on theline II-'-II,- Fig. 1,: looking in the direction of the, arrow, and showing the flap as pulled out into the central portion of the bag .by the nozzle and with the bulk material circulating back thereof;

Fig. 3 is a fragmentary side elevation of an end portion or ply paper tubing or blank for a bag end or top having a flap of the invention herein, attached at the end offset or extension determining the inner limit for the valve, the flap having a fully loose portion depending below the trough or lower portion of the valve;

Fig. 4 is a plan view of a ply paper bag end, with two flaps, instead of but one, as shown in Fig. 3; and

Fig. 5 is a fragmentary perspective view of the valve portion of a valve bag, equipped with the invention herein, in the form of a single flap.

Those handling the storage of bulk materials, such as flake, granular or powdery products, frequently adopt plural thickness of paper to form bags, a quite considerable proportion being of three or more ply kraft paper stock. In practice, the strip stock has adhesive along longitudinal edge portions, and such are successively brought together in forming say three concentric tubes, in the instance of three-ply bag production. These long strips of tubing as assembled, are cut into lengths for paper bags with opposite fiat or major sides I, 2, (Fig. 4), with V-folds 3 connecting the margins of the sides I, 2. An open end 4 as the top has a valve-defining narrow extension portion 5 which extends across a fold 3 and about as much further than the fold along each of the sides I, 2, therefrom. The opposite end of the tube section may have a stitching 6 to assemble a fold-over or binding strip I, say of crepe stock, in completing an end closure for the bag. The opposite end of the tube which;

has the valve-defining portion 5 beyond the end 4, has a fold line 8 from the junctions 'of the ends 4 of the sides I, 2, with the portion 5. These folds 8 have continuation folds 9 therefrom in the V-fold 3. There is thus located a trough bottom portion Ill at right angles to the general direction of the fold 3, as a terminal section of the fold 3 forming a way with the portion 5 as its inner open end. Additional stitching 6 may now assemble another binding strip 1 at this end in a line determined by the ends 4 of the sides I, 2, and the remote V-fold 3, not involv- 7 ing, the folds 8, 9, except the ends of the folds}.

Under th invention herein, before the stitch ing 6 applies the strip 1' at the end 4, 5, a'ilap II may have an attaching connection, as by ad: hesive. I2 to the inside-the-bag-side of the poi tion 5 inthe extension of the'portion 5 inward from junction with the end 4. The important limit of extent for this connection of the flap II along the portion'5, is to have such t erminate'at the trough bottom portion I0, so "that as"fi1ling tube or nozzle I3 be thrust into valve opening I4, there is a depending loose free end portion I5 in the bag upper portion beyond the valve opening terminus 5.

The velocity pouring or blowing of loose bulk material I6 in being discharged from opening ll of the tube I3, distends the sides I, 2, of the bag for the material to fall freely against the bag bottom portion and accumulate up toward the top. The material I6, in this rise tends to seek upper unfilled or clear regions. The portion 5 in the region of the trough bottom III, is drawn away from the side I, and as so drawn brings with it the connected portion of the flap II, thereby to locate the loose depending flap portion I5 centrally of the bag and below the discharge opening ll of the filling tube I3. The flap portion I5 thereby establishes a quiet region back thereof from the opening I'I into which the loose material I6 piles up into a hump I8.

In the event there be an additional flap I9, similar to the flap II, but for the opposite side of the valve opening I4 along the other portion 5 to the bottom I0, there is thus located centrally of the bag a pair of loose depending flap portions between which the filling tube discharges for the loose material It to lodge into heaps or humps I8 on each side away from the tube I3.

When the determined, or weighed quantity of material has lodged in the bag, the supply may be discontinued, the charged bag removed from the tube I3, and as slumping down, the

humped material l6 of the region I8, flexes the flap portion l across the inner portion of the valve opening l4. Therefore it follows automatically that in the collapsing of the valve upon the withdrawal of the tube I3, the flap l5 serves as an automatic check valve to supplement outflow cut-ofi as partially achieved upon the collapse;

The v ve, op at on her er i euss d or multi-plyfpaperf ba;gs, 'may be for slih gl e ply o'thei flexible stock than paper, as cloth, and even for cartons or rigid wall containers, having a fold: able valve portion or section. Likewise, the flap may be of kraft paper stock, desirably readily; flexible, or of cloth, or other flexible material.

The showing in Fig. 5 discloses thein-turn'ing of the top corner of a bag, towhich there at-i' tached a flexible strip II. In this folding of the bag corner, the end of the strip ll rising from the j unction of the end portion 4 withthe portion bw ii iei fi e w th-the por ebin ii i' tf b u fs -r r n e s "the? stltf ngp he strip l 'thu fhas' att hrnent ail-the top:by'thestitchihgfi' as a side extension into the bag beyond the inneryerid oi t, ening" [4. Furthermore; the adhesi elZ so con sthestrip portion as coming dawn -from iei e s. .v f a t 6i; ih beenm Us qrew a ar em the a sid'e' IL the attachetif portion of the strip-ll is i new Pu d aw y fr m t ee s de-t ewlfllfafl least along'the regionofthe-adhesi-ve 1,2,; 'Ifh'e strip t me its-nag 1-5 dep n ing below '1 f it lQfiS n t'hai j @1 @QQ nection orfatt achment tofthe' ODQll iIjIE SldG mai sf xt name a t; across th r g b tt "we :,.'w m

Uf here v eo em, or the ncl' stitched portion-"4" that as thejsidje oi; the opening M, the inner terminus of such opening is automatically clogged and effectively slilitbr closed by the strip II and its portion [5. What, is claimed and it is desired to secure by Letters Patent is:

An improvement. in valve bags having an intake valve. of foldable collapsible type comprising a flap secured to one side only of the collapsed valve on the bag side thereof and extending beyona andblovv the open inner of thefifalve, saidfi'ap' being also secured at" its""upl er end to the bag" adjacent the upper end of the valve and the closed endof the bag and being otherwise unsecured; the flap terminatinga free edgebel'ow the folded valve in onapsed condition and also terminating in a free edge beyond theinn'er' open; end of the vawe whereey the flap is adapted tolie' fiat 'ag'ain ttne valve in opera tive position and aid 'in"sealing'the valve opening.

" 5 JOHNSON.

CES. CITED,

UNITED STATES, rams Number Name Date 2,143,5 3 Rose Feb. '28," 1939 2,139,847 Verwys Feb; 13, 19,510 2,307,111 Cont'ryman "Jan. 5,;1943

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