US1855216A - Apparatus for making paper cans and the like - Google Patents

Description

April 26, 1932. R. A. BENNETT APPARATUS FOR MAKING PAPER CANS AND THE LIKE Filed June 1s, 1927 2 sheds-sheet 1 1"77 ve 77 tor 7770 '77d d 627176Z? LYLkMf-Mu @1'1"973776295 April 26, 1932-- R. A. BENNETT APPARATUS FOR MAKING PAPER CANS AND THE LKE Filed June 13, 192'? 2 Sheets-Sheet 2 I?? v6 77 l/o 24 .Ray 711cm? H6 wnei Patented Apr. 26, 1932l LIUNI'TED STATES 'PATENT' OFFICE nAYxOND A. BENNETT, OF EAST WEYMOUTH, MASSACHUSETTS, AssIGNon To THE BooTmsY FIBRE CAN COMrANY, or BOSTON, MASSACHUSETTS, A CORPORATION or.

MASSACHUSETTS APPARATUS FOR MAKING PAPER CAN'S AND m V Appnenmi inea :une ia, i927. serial'No. 198,388.

This invention relates toimprovem'ents in apparatus for making ,paper cansandthe like. More e'speciallyvitl re ates to apparatus for fastening va disc closure in the end of a tube.

The invention provides a joint between the tube and the closure ldisc which is both tight and secure, in an absolute sense `;that is, so tight that I have not been able to force liquid out from a can thus closed, by leakage through this joint, although in every other type of paper can known to me I have been able to do that.

`Heretofore the tightness of this joint has depended upon either the fit of the edge ot a plain disc against the tube surrounding it or upon the crimping ot the flange of a flanged disc with the end of the can body. Apparatus of the present invention makes a jointwhich combines these types, there being both a crimped flange and also a tight lit to the tube of what may be called the edge of the circular part of the disk, i. e., by a bead at the corner between the flange and body portion of the disk.

An important feature is that the invention makes it now for the first time'possible to apply heavy swedging and creasing pressure in the crimping of the paper material, sufficient to make the oint actually tight. It provides i' or confinin g the material` while being pressed,

and confining it so closely that the pressure effects its acute deformation, beyond the elas tic limit, giving it a permanent set, in a new and impermeable conforn'iation. rlhe invention comprises apparatus for making improved joints havinfr the above and other advantages, some of Wzliich are mentioned hereinafter; and further purposes are to make the apparatus of a simple and durable construction; automatic in action, with certainty as to results: and easily managed by the attendant.

In `the particular embodiment of the invention illustrated in the accompanying drawings, the apparatus comprises a fixed form called a plug, on which are placed the tubular can-body and the flanged-disk endclosure, towardand from which is movable shape preferably a counter-part of, the end of the'plug except as to that part of the plug which isv opposite the annular spinning die. In action, the spring plunger andthes inning die approach the disk on the end of t e plug, with the plungerl in the lead. The plunger engages the disk, presses it firmly against the end of the plug, and then, its advance being thus arrested, remains spring pressed in close contact with the disk while the, annular die continues to advance and in so doing performs its crimping and compressing operation upon the paper lips. The cylindrical ex- A terior ot this plunger cooperates with the approximately cylindrical interior face of the duter wall of the die (which engages the outer face of the outer lip) to make the inner and outer side walls of a closed annular chamber having a length in the axial dimension which steadily diminishes as the die moves toward the plug. With the advancing of the die the lips of paper stock at first are crimped inward, in a manner already known, and are formed, without constraint other than that incidental to the crimping; but this formation later becomes severely compressed both in the radial direction and in the axial direction because of the diminishing axial dimension of the chamber Within which the crimped lips are contained and the perfect resistance to radial escape afforded by the two said cylindrical walls. The dimensions of this chamber may be designed with reference to the length and thickness of paper, lips which are to be crimped, so that the plunger will become tightly pressed against the plug the cylindrical flange of thedisk fits within j form herein `illustrate before lmaterial in the annular chamber is so far `compressed as to tend to escape past the leadin edge of the plunger. The pl-unger thereafter makes the chambertight and affords radialY support up to the limit of any pressure which it may be desired to by further advance of the crimping head, without any contents of said chamber having possibility to escape. There may be special formation of that part of the end of the plug which constitutes one end ofthe chamber sok that under the high pressure it will swedge the crimped material radially inward and outward to prevent any tendency of the lips to unroll after their supporting surfaces have been Withdrawn. The other end of the chamber is made by the crimping die; and if the plunger be non-rotating, 'as in theV preferred its exterior should have a very small clearance, a few one-thou-l sandths of an inch, for example, a radial clearance of four one-thousandths, from the smallest dimension of the head which is ro-4 tating around it, so that there is not space for any substantial extrusion of the compacted paper stock to occur into the annular clearance between spinning head and plunger, but the pressing of the stock into the entrance of this clearance'makes a stiff corner bead or crease in the stock. So constructed, an extraordinarily high pressure can be applied bythe s inning head to compact the contents of the c amber, so as to make the paper lill every portion ofthe die chamber. This may deform kthe paper so acutely,"and so re-shape it at its curves, that, it remains set with no tendency to unroll or open. In consequence thejoint becomes exceedingly rigid and is so tight asl to resist any leakage through it.

It will be understood that details maybe arranged in various ways, so that the drawings-are to be considered more or less diagrammatical. v

Itis intended that the patent shall cover by suitable expressionin the appended claims, whatever features of patentable novelty exist in the apparatus disclosed. v

In the accompanying drawings:

Figure 1 is a side elevation of a machine for making. paper cans embodying the present invention; a i

Figure 2is a plan of the plug, and of the spinning head and driving mechanism therefor;

Figure 3 is a medial section of the plug, plunger and spinning head with the plunger in its initial engagement with the disk of the end closure; and

Figures 4, 5 and 6 are sectional views showing progressive relative positions of the plug, plunger and spinning head and illustra-ting the corresponding formations in the paper as the interlocking and crimping of the material occurs. These are to an extent diaapply;

ythe hollow shaft 18.

grammatic, with certain clearance-exaggerated.

Referring to the drawings, the machine frame lOcarries a yoke. standard12-A whose arms 12 support bearing collars 16 in which a hollow shaft 18 is journaled. Tight and loosepulleys 20, 20on this'shaft provide for the reception of power from any suitable source which can be thrown onor off themachine by the belt shifter 22. The hollow shaft .18 contains a die-carrying sleeve'24 which eX- `of this cylinder 29 is the merest trifle smaller than the 26 carried inner diameter of the annular die on the die-sleeve 24, so that it can move freely with respect thereto and yet'y these two surfaces are too close togetherl for the paper to enter between them when under the very high pressure which isl to be de scribed. Atthe back end of the sleeve24, the

plunger rod 28 carries a coiled spring 30 of the compression type in a cage 32 secured to the back end of the-sleeve 24, so that the sleeve 24 and spinning head 26 can continue to move forwardafter the progress of the plunger ,29 has been stopped by its encountering the end of a plug 46. In this action the back end of the said cage -32 advancing with the said sleeve 24, compresses the spring 30 against across pin 34 on the arrested plunger rod 28. Rotation of the rod and plunger is prevented by a lug 36 engaging al slot in an arm 37 secured i l to the standard 12. 38 may be inserted to Suitable thrust bearings relieve friction. i In this stage of action the annular spinning head 26 moves forward alongthe'stationary plunger` 29, reducing the axial length of the chamber around the plunger is being accomplished. To advance the sleeve, and with it the plunger rod through the medium of the sleeve, .and spring 30, a reciprocat- 29 in-which the crimpingl ing arm 40 is fastened to the' sleeve and is engaged by a rather strong bar spring 42 car-l ried on one arm of a leve-r 44 pivoted on the frame and arranged to be rocked by a cam 45 Y V on a shaft 47 which is driven lby suitable gearing 48 forming a driving connection from Onthe frame at the ment of the spinning head and which the can body 50 ameter corresponding forward end of moveplunger head. on the same axis therewith, is a plug 46 on and its endl closure 52 are mounted. This plug has :1n-outside dito the insidediameter ablyl a raised extending axially easily within the Athe plug causingthe ed against this ridge ragainst the vflange 54 as shown in thrust into the can body as at 66 (Fig. 6). The stock of the latter, thus squeezed by the disk angle'entering it, is in turn forced into thecrevicesbetween the folds of the flange as at 68. If the pressure is carried far enough every bit of space in the chamber may becomesoccupied bythe paper. The ridge 49 on the plug, being between the edge of the plunger 2O and flange 54 of the disk, makes a sharp bend in the lip 50 of the can body which' has been thrust over it, so that it is acutely deformed and its elasticity destroyed at the bend. `Similarly at the other `end of the joint, the inner edge of the can body is severely creased where the paper is compacted at theentrance of the clearance space between the inner edge of thedie 62 and the cylindrical face of theplunger 29.` This corner of the paper can easily be made abrupt, if the metallic angle -between 62 and 29 be so; and also in fact a slight rid e or bead at this inner limit of the folded bo y lip 50may be formed bythe paper stock just entering the narrow space between the die and the plunger and forming a sort` of bead as at 70 (Fig. 6);." The inner face of the compacted mass made of the acutely bent lips 50 and 54 is cylindrical, being formed against the cylindrical surface of the lunger. The edge partof the disk port1on52 is4 sharply inclined inward in accordance withthe inner slopeof the circular rid e 49; and at its very edge is inclined reverse y as' shown, or may be dished-in if preferred,- but near the edge of this face thereis referring forming a bevele ridge 49. When thetube which is to constitute the can body 50 has been slipped onto this plug, and its e'ndclosure, which is then lin theuform of a disk 52 having an out-turned flange 54 toward the Aspinning head along `the inside of the tube, has been seated 49, the circular peak of the ridge is slightly nearer the' axis of the plug than is thelinner surface ofthe disk closure With the tube 50 and its end-closure 152,' 54 on the plug, the cam 45 swings the lever 44 to move the plunger head 29 and spinning head 26 toward the plug, the plunger head passing flange 54 until it abuts against the disk surface 52.v The diameter. of the plunger head being appreciably smaller than the diameter of the ring ridge 49 the disk surface 52 is lpressed against the face of ge por'tion of this disk to bend around the inner bevel of the ridge 49 as seen in Figure 4. `The coiled spring 30 on the. plunger rod should be strong enough to force the plunger head and the disk surface` firmly against the face and ridge ofthe plug.`

Although the plunger head andv disk have thus become bottomed and the plungers ads. va-nce arrested, the spinning head continues to advance.Y This head has anV annular recess with its entrance slightly. beveled as at 60, to make sureof'engaging outside of the can tube according to the outer slope on the said ridge,` 50,and within is of the same diameter as the although this outer bevel is not so pronounced said outside surface of the tube until at lits because at this point the angle of. disk has bottom 62 it curves inward and then fOI'- been forced somewhat into the side 50 ofA Ward to constitute a sp1nn1ng die face, ter# the can, by the extrusion of a sort of bead." minating very close to the plungers convex yen the paper material has been thus Cylindfal ,Slllface- AS the head iS mOVed creased and compressed in the Achamber or forward-by the cam, the cylindrical lips 50, spaced between the plug, plunger and die 54 -Of the can body and its end clOsuleare until its compactness has reached a degreev gradually turned mward by the rotating die which resists further compression, the bar bottom 62, crimped around and forced forspring 42 yields,l allowing the peak ofv thev ward along the cylindrical surface of `the camy 45 to pass y'the rollers onthe actuating plunger 29. The curving of these portionsrlever 44. As the'lever is returned by the gives them a tendency to curl so that when cam 45 the spinning head is first withdrawn the leading edge of the can body lip reaches alone until the compressed spring 30 has been that surface of the disk 52 which is bent outexpanded. This enables the plunger 29 to ward over the ridge 49 on the plug, this leadholdv the closure disk and tube against the 116 ing edge slips outward along t e disk up plug 46 until the spinninghead 26 and plungl Figure 5. er 29 are in the positions relative to each oth- Y he spmnmg head continues to advance; er, shown in Figure 4, with the beveled porand because the crimped edges of tube and tion beside the crimped end of the can. closure are now enclosed on all sides in, a Further withdrawal of the head brings withl chamber of diminishing dimension, the spin- 29 which slips out of the ning head soon begins powerfully to comthe can, which occurs the press the rolled or crimped lips of the body more easily if there be a slight tapering of and disk. This movement of the head imits end portion, poses such compacting pressure on the paper The can may then be removed from the plug. material that the angle of the disk, where It is advantageous to have a plurality of its flat surface 53 joins its cylindrical flange these plugs mounted on a rotating head stock,

54, is forced outward into the space between 4 so that whilethe sealing operation is bein the plug ridge 49 and the can body 50; and performed on one plug a-can body with andl ecause of the bevel of the ridge is actually closure may be being los lr6 i as indicated at 31 in F ig. 5

placed on another plug and the finished can may be being removed from the lug last previously in operation. The use ofa head stock rotatable on an axis perpendicularsto that of the operating parts permits of a plug being swung into alignment With the spinning headl from a lateral position With precisely the proper position! bined with a plunger, movable against the blank on the plug; and a crimping die surrounding the plunger, movable toward the plug independently of the plunger, and acting to compress the associated flange and body-end between itself, the plug and the plunger; the peripheral portion of the plug face, outside of the Aarea overlain by the plunger, being in the same plane as the central portion of the plug face. i A

2. Apparatus for making paper cans and the-like comprising aplug, for supporting a can body and its flanged closure blank, combined with a plunger, movable against the blank on the plug; and a spinningcrimping die surrounding the plunger, movable toward the plug independently of the plunger, and acting to compress the associated flange and body-end between itself, the plug and the plunger; there being a flaring entrance to the clearance between die and plunger, and there being surface of the die having a spinning function ad]acent to said clearance whereby the concentrated pressure is applied l by the die to the material there progressively.

3. Apparatus for making paper-cans and the like comprising a plug, for supporting a can body and its flanged closure blank, combinedl with a plunger, movable against the blank on the plug; and a crimping dic surrounding the plunger, movable toward the plug independently of the plunger, and acting to vcompress the associated flange and body-end between itself, the plug and the plunger; the peripheral portion of the plug face, outside of the area overlain by the plunger, being in the same plane as the central portion of the plug face, and the said die having that portion oit' its crimping surface which terminates against the plunger, located at a substantial distance from the plug when at the end of criinping'stroke, whereby a. substantial extent of surface of the crimped materials then lies against the plungers side wall; there being a small clearance space between plunger and dle'into the entrance of which small space a portion of the material of the body-end may enter and be creased lwhen pressed by continued approach -of the die to the plug.

4. Apparatus for lmaking .paper cans and the like cdmprising,y in combination, ,a5 yplug arranged Ito support a can body and ailanged closure ldisk in. the body, with an end'of the body 'and the flange ,of the closure projecting away from the plug; a spinnigliead movable toward said plug and adaptedto crimp and compress said 'projecting portionsfof the, can andclosure together; and means, .for moving said head toward said plug, having a member adapted to yield when the crimping pressure a is resisted to a predetermined degree by the crimped and compressed stock.

5. Apparatus for making paper cans and the like comprising, in combination, a plug arranged tosupport a can body and a flanged closure disk in the body with an end of the body and the ilange of the closure projecting away from the plug; a spinning die adapted to engage said projecting portions of the can and closure and to crimp them into a tight seam; asleeve carrying said die; a rod in said sleeve; a cylindrical plunger on said rod; means for rotating said sleeve and die; and means for moving said sleeve and rod axially toward said plug, comprising a yieldable connection between the sleeve and rod whereby 'the die may be moved Atoward said plug after said plunger has become seated on the closure.

4 6. Apparatus for making paper cans andy the like comprising, in combination, a plug whose endfor the Inost `part is plane but which has an angular ridge extending around V its edge; a plunger with planeeiid portion' movable kagainst said plane portion of the plug; and a crimping die surrounding'said plunger and movable toward said plug independ'eutlyof the plunger; said die being formed with crimping space between it, the

plunger and the plug, with the side surfacev of theplunger serving as the inner' wall, and

the end of the plug serving as the bottoni wall, of said crimping space; and said ridge on the plug being located adjacent 'to the outer wall of said crimping space, and being 4adapted to eliect a swedging and creasing of material in said crimping space when said die compresses the mass. 1 I

Signed vat Boston, Massachusetts, this fourthday of June, 1927.

`RAYMOND A. BENNETT.

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