US1249095A - Method of forming closures for paper receptacles. - Google Patents

Description

E. F. HULBERT.

METHOD or :FORMING CLOSURES FOR PAPER RECEPTACLES.

V APPLICATION FILED AUG-17.1916- I 1,249,095, Patented Dec. 4, 1917.

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METHOD OF FORMING CLOSURES FOR PAPER RECEPTACLES. APPLICATION mm AUG- 11. 1916.

1,249,095.. Patented Dec. 4,1917.

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s imx 'IIIIIIIIIIIIllIIIIIIIIIIIIlIII/IIIIIIIIII EDWIN F. HULBERT, 0F MILWAUKEE, WISCONSIN, ASSIGNOZB. T0 NATIONAL PAPER CAN COMPANY, OF MILWAUKEE,

WISCONSIN, A CORPORATION OF DELAWARE.

METHOD OF FORMING GLOSURES FOR PAPER RECEPTACLES.

Original application filed December 1, 1913, Serial No. 803,914. Divided and this application filed August 17,

Specification of Letters Patent.

Patented Dec. 4:, 11917.

1916. Serial No. 115,388.

To all whom it may concern:

Be it known that I, EDWIN F. HULBERT, a citizen of the United States, residing at Milwaukee, Milwaukee county, Wisconsin, have invented a new and useful Improvement in the Methods of Forming Closures for Paper Receptacles, of which the followingis a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figures 1, 2, 3 and 5 are vertical sections of a portion of a receptacle illustrating different steps in the formation of the closure;

Fig. 4 is a perspective view of one of the caps removed; 7

Fig. 6 is a vertical sectional view'showing a modification;

Fig. 7 is a side elevation, partly in section, illustrating a, further feature which I prefer to employ; and

Fig. 8 is a plan View, partly broken away, showing the form of Fig. 7.

This application is a division of my copending application, Serial No. 803,914, filed December 1, 1913.

The object of my invention is to provide a strong and tight closure for paper cans of round, square, rectangular or other form, without the use of wax, cement or other coating, the closure being secured wholly by mechanical means.

Referring to the accompanying drawings,

' Fig. 1 shows the first step in the operation of forming the closure. In this figure the numeral 2 designates a portion of the body of the paper receptacle, and 3 a disk of paper or other suitable material and having a right-angled flange 4. This'disk is forced into the end portion of the body of the receptacle to any desired distance, which may vary from that flush with the edge up to a distance twice the depth of the flange 4, or any other desirable distance, as shown in Fig. 1, with the flange projecting outwardly. The upper edge portion 5 of the body of the receptacle is then curled or pressed inward anddown over the flange 4 and substantially parallel therewith, as shown in Fig. An annular depression or bead 6 (Fig. 3) 1s then rolled or pressed into the triple-ply wall thus formed. In forming this head, the disk or cap 3 is expanded and firmly locked in the wall of the receptacle, being held not onlyv groove formed in the said body, the engagement therewith of formed in the folded body portion take a flat blank, such as shown at 7 in Fig. 4, of paper or other suitable material, and force this into the end of the receptacle until its peripheral edge snaps into the annular depression 6, as shown in Fig. 5, the disk being preferably dished; As sesses some resiliency, its natural tendency is to resume its original fiat form. This causes it to exert an outward radial pressure at its peripheral edge which acts to firmly pinch the flange 4: between the locking portions of the body. The parts are, in this manner, so tightly seated that when pressure is applied, either inwardly or outwardly on the closure, it remains locked firmly in position.

Fig. 6 shows a modified form or closure particularly adapted as a top closure, to per- Init access to and the removal of the contents of the receptacle. This form is constructed the same as that first described, except that the inner cap or disk 3 is formed with a central opening 8, and the outer cap or disk 7 is formed with a centrally depressed portion 9, which fits within and closes the said central opening.

As shown in the preferred form of Figs. 7 and 8, I form a seat for the inner cap or disk 3 by means of a series of indentations or crimps 10 which are pressed into the body of the Vessel at spaced apart points around the circumference. By forming these as separate indentations, instead of a circular but also by the bead 5. Inext groove, I avoid weakening the receptacle against endwise pressure while obtaining the seat for the disk.

The unbent portions of the receptacle wall between the indentations 10 serve like struts to prevent the bead formed by the indentations from collapsing under pressure or flattening under tension as it would be, likely to do if the bead were formed of a continuous circular groove in the wall, especially if the paper become at all softened by liquid.

The advantages of my invention will be apparent from the foregoing, since it provides a closure for paper receptacles which is strong and tight Without the use of wax, cement or other coating to secure it in place and seal the joints.

This can will withstand considerablethis disk pos-' shocks and blows which may be given it during shaping or otherwise, on account'of the strength of the brace joint closure.

Various changes may be made in the can,

the caps, etc., without departing from my 1. The herein described method of forming a closure for a paper can or receptacle,

' WhiCll'COIlSlStS'lll forcing into the end portion thereof a closure member having an outwardly turned peripheral flange, then turning the end portion of the body of the receptacle downwardly and inwardly over the edge of said flange and within the same, then forming a locking bead in the triple wall previously formed, and finally forcing into the end portion of the receptacle an auxiliary cap or closure of larger diameter than the inner diameter of the said triple -wall, and causing its edge to engage with the said groove; substantially as described.

2. The herein described method of forming a paper can or receptacle, which consists in forcing into the end of the-body portion thereof a closure member having an outwardly turned peripheral flange, then turning the end of the body portion downwardly and inwardly over the edge of said flange and within the same, and finally forcing into the end portion of thearticle an auxiliary cap or closure of larger diameter than the inner diameter of the triple wall, and cansing its edge to exert an outward locking pressure thereon; substantially as described.

3. The herein described method of forming a paper can or receptacle, which consists in forming a seat or bead on the body portion by forming a series of indentations which are spaced apart and separated by strut-like unbent portions of the body wall and in inserting'in the end of the body portion a closure member and seating it against such head or seat, substantially as described.

4. The method of forming a paper can or receptacle, comprising the step of forming a seat or bead ontlie body portion by pressing therein a series of indentations whic are spaced apart and separated by strut-like unbent portions of the body wall.

In testimony whereof, I have hereunto set my hand.

EDWIN F. HULBERT.

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