US1568790A - Paper and like material container - Google Patents

Description

Jan. 5 1926. 1,568,790

W. L. WRIGHT PAPER AND LIKE MATERiAL CONTAINER Filed April 26, 1924 2 sheets-Sheet 1 Jan. 5 1926.

w. L, WRIGHT PAPER AND LIKE MATERIAL CONTAINER 1924 2 Sheets-Sheet 2 Filed April 26 rfIIH Patented Jan. 19126.

UNITED STATES PATENT OFFICE.-

WILBUR L. WRIGHT, OF FULTON, NEWiYRK. ASSIGNOR T0 OWEGO FALLS COR- FPORATION, OF FULTON, NEW YORK, A CORPORATION 0F NEW YORK. v

PAPER AND LIKE MATERIAL CONTAINER.-

applicaties mea April 2e, 1324. serial No. 705,246.

To all whom it may concern.

Be it known that I, VVILBUR L. WRIGHT, a citizen of the United States of America, and resident of Fulton, county of Oswego, State of New York, have invented certain new and useful Improvements in and I telating to Paper and like Materlal Containers, of which the following is a specification.

This paper container invention relatesparticularly to the end closures for containers and for container covers, composed of fibrous sheet material, such as more or less flexible paper, pulp board, mill board or .the like; and the objects and nature of the invention will be readily understood by those skilled in the art iii the light of the .following explanations of the accompanyin drawings that illustrate the preferred mec anical eX- pressions or embodiments of my invention from among other forms, constructions and arrangements within the spirit and scope thereof.

Heretofore, it has been to all intents and purposes, impossible to produce a satisfac tory really liquid tight paper container having a so-called single bottom, 1.. e. where the end closure is composed of asingle flanged aper disk secured in the end of the barrel y'crimping the end of the barrel wlth, or to enclose, the flange of the disk. I .have discovered that the tendency of such single bottom paper containers to leak, is due to the distortion of the disk flange by the crimping process and the formation therein of slight creases, wrinkles, or surface iissures, that form leads for the liquid from the E container through which the liquid by capillary action, seepage, or otherwise, is caused to penetrate the crimp and work out around the extreme edge of the body wall and onto the outer surfaces of the disk and crimp. The crimping process in securing such single bottoms, always tends to open up a gap or space between the inner surface of the container barrel and the outer surface of the annular angular edge portion of the disk. where the flange depends into the crimp, and this annular gap opening into the container leads directly down into the crimp between the outer surface of the disk flange and the inner'surface of the barrel and increases the tendency to leakage and seepage along or by means of such wrinkles and creases within the crimp.

It is an 'object of my invention to provide a simple, effective and economical paper material (or the like) end closure for paper material or the like) barrels. that will overcome the hereinbefore mentioned difficulty. and that will reduce to the minimum possibility of liquid leakage. y 0 With this and other objects in view, my invention consists in certain novel features in construction, and in combinations and arrangements as more fully and particularly pointed out and specified hereinafter.

Referring to the accompanying drawings, forming a part hereof Fig. lfis a longitudinal sectional view` viding cylindrical containers .with the end closure of my invention.

Fig. 8, is a longitudinal section of a tapered paper container having flanged disks therein preparatory to completing theend closure of my invention.

The cylindrical paper container, partially illustrated, consistsof a body or barrel 1, constructed in any suitable manner of sheet paper, such as suitable pulp board or other iexible sheet or fibrous material or the like, and closed at one end by closure consistin of a main or vmajor sheet paperv materia disk 2 having annular flange or'skirt 2*, and a superimposed cooperating inner packing or sealing sheet paper material disk 3 having relativelyT short plain or smooth Harige 3*, the two disks being locked and secured to and within the barrel, to complete the closure, by any suitable crimp, whereb the lower end of the barrel encloses the ange of the major disk and forms the depending annular rim 4.

Various formations can be utilized or means provided for thus lockin or securing disks to and within 'the barre 1. In the formation of Figs. 1 and 2, the projecting end 1a (Figs. 7 and 8) of the barrel extending beyond the flange 2, is contracted and turned inwardly across the .end edge of flange 2a and 1s then turned toward the outer surface of disk 2 and pressed radially outwardly with end extremity 4a, turned outwardl and tucked into the crimp, forming a lock, and during this crimping operation great pressure is applied to tighten the crimp and compress the same longitudinally toward the flat bodies of the disks.

In the formation of Fig. 3, the disks are secured by crimping the barrel end and flange 2, and the crip 4", is locked by forcing into an annular groove 2b in the major disk 2.

In Fig. 4, there is shown another form of securing crimp 4, wherein the barrel end and flange 2, are rolled and compressed together.

Fig. 5, shows another forni of crimp ld and lock.

Heretofore, the major disk 2 and its flange, and various forms of securing crimps, for instance approximately such as more or less diagrainmatically illustrated among others, bottom containers, and leakage has resulted, as hereinbefore explained because of the annular gap necessarily opened between the inner usually smooth surface of the barrel and the annular outer surface of the disk near the base of the flange, said gap leading into the portion of the crimp Where the paper is necessarily distorted and wrinkled y the crimping process.

I have discovered that this leakage can be prevented and a liquid tight paper container produced, without prohibitive added ex ense or material change in the paper container production method, by the provision of the inner, sealing or packing disk 3, having the short usually smooth flange 3a, with the inner disk facing the inner surface of the major disk 2 and with the short flange 3 tightl held and compressed between the flange o the major disk and the inner surface of the barrel 1 and closing, packing or sealing the hereinbefore mentioned gap, but terminating short of the actual crimp, i. e. the short flange 3, preferably terminates 'short of or above the wrinkled distorted portion of flange 2a that is within or actually forms a part of the crimp. In other words, in the com leted container the major disk 2 is closely tted or nested within the sealin disk 3, with the short comparatively smoot flange 3, exteriorly fitting down around the comparatively smooth exterior surface of the upper or base portion of the flan 2.

T e inner or sealing disk 3 -is usually composed of comparatively thin sheet paper material and is usually Water proofed. The major disk 2 is preferably composed of thicker sheet paper' material, usually of a have been used to form single cheaper grade of pulp board than the inner disk which thin inner disk can be composed of a good grade of paper, for instance a good manila sulphite. However, I do not wish to so limit m f invention. The inner disk 3 is tightly an permanently secured as a part of the closure, by its short flange which is gripped and compressed between the barrel and major disk, rendering the annular joint at this location liquid tight, and furthermore the sealing disk is by its short flange thus permanently held to place and cannot be accidentally displaced, as sometimes happens with the inner nonflanged disks of' a certain double bottom container now extensively made and sold.

Any moisture that may work into and penetrate the short flange of the inner or sealing disk of my present invention will cause said flange to tend to swell and thus the more tightly close the joint against liquid leakage, although if so desired, parafne or other waterproofing material can be employed to aid in cementing the inner disk in position aud sealing against leakage. The sealing disk 3 having a short flange 3, is easy to draw b v dies to disk form with a verysmooth-surfaced flange, a smooth flange that can be tightly compressed between the smooth surface of the barrel and the smooth surface upper or hase portion of flange 2, of the major disk. without the formation of creases or other leads for downward liquid seepage. As the flange 3a is short, it is not so distorted by the crimping process as to produce creases and the like that tend to leakage.

In the process of bottoming paper containers, according to any present invention, the open end cylindrical paper body or barrel 1 1s placed over a mandrel, with the upper end of the barrel projecting the proper distance upwardly above the upper end or top Working face of the mandrel. By the ut1lization of any suitable mechanism, the flanged disks 2, 3, are produced, preferably in flaring or dish form (see Fig. 6) and nested with the major disk 2 within and over the sealing disk 3. The two nested disks as a unit are forced down into the projecting upper end of the barrel, by a suitablel reciprocatin plunger, or in any other suitable way, until seated on the upper end of the mandrel. The flanges of the two disks are thus brought to cylindrical form within the body (Fig. 7) and are tightly wedged and approximately compressed or held under pressure within the body. The mandrel with the body and disks as in Fig. 7, are then brought into operative relation to a lsuitable crimping or spinning head, that completes the bottom closure by the formation of any suitable crimp, such as any one of the forms disclosed by the drawings, or any other suitable for the purpose. In fact I do not wish to limit my invention to any of the bodies.

In .bottoming such tapered barrels, the nested disks are first properly located on the upper end of a mandrel, and the tapered paper body is then forced down on the mandrel, large open end first, and over the nested disks, until the disks are brought to form and the body reaches the longitudinal position, with respect to the disks, about as shownby Fig. 8. The barrel and disks are then ready for the crimping operation, which will produce the formation of Fig. 2, or any other suitable securing crimp or other means. B the use of the term paper material in t e claims, I mean, the material hereinbefore referred to and the equivalent thereof.

It is evident that various departures might be resorted to without departing from the spirit and scope of my invention and hence I do not wish to limit myself to the exact disclosures hereof.

What I claimis:

1. A. thin sheet paper material barrel having a liquid tight permanent inset end closure embodying a flanged imperforate major disk and a correspondingly flanged inner disk enclosing at least the inner end of the major disk and an annular longitudinally and radially compressed locked crimp securing both disks to and in the barrel, said end closure consisting essentially of said major disk drawn from sheet material, and said inner disk drawn from thin flexible sheet paper material tightly fitting and facingA the mner surface of the major disk and having its annular flange throughout its length concealed and compressed between the major disk flange and surrounding inner surface of the barrel and thereby holding the inner disk as a permanent -part of the end closure and sealing the annualar joint between the inner surface of the barrel and the major disk against liquid seepage along the major disk flange to the lock crimp.

2. A thin sheet paper material barrel having a permanent liquid tight double disk end closure consisting essentially of a major disk having an annular flange, said disk drawn from sheet material, and a thin flexible sheet paper material inner disk having a short annular flange, said inner disk being drawn tightly over the major disk with its flange concentric with the major disk fiange and tightly gripped between the major disk flange and the inner surface of the barrel to seal the joint between the inner surface of the barrel and the major disk against liquid seepage and to secure the inner disk as a permanent part of the end closure, said major disk fiange and the barrel end being rolled and longitudinally and radially compressed to form a permanent locked crimp.

3. In the method of forming a permanent liquid tight end closure for a paper container barrel, those steps which consist in draw.- ing a major closure disk with an annular flange from sheet material, drawing an inner disk with an annular flange from thin flexible sheet paper, nesting said two disks with the inner disk enclosing at least the end portion of the major disk, then forcibly driving said two nested disks longitudinally into the container barrel to tightly draw the inner disk over the inner face of the major disk and to tightly compress the inner disk flange between the inner surface of the barrel and the'major disk and thereb seal the annular joint between the major dlsk and surface of the barrel against liquid seepage and to sen cure the inner disk as a permanent part of the end closure, and then permanently securing the disk and barrel together by a rolled locked crimp under longitudinal and radial pressure.

In testimony whereof I have hereunto set my hand at Fulton, N. Y., this 24th day of April, 1924.

WILBUR L. WRIGHT.

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