US1213648A - Closure for paper receptacles. - Google Patents

Description

E. F. HULBERT.

CLOSURE FORPAPER RECEPTACLES.

APPLICATION FILED DEC. 1, 1913.

1,21 3 6%8. Patented Jan. 23, 1917.

I 2 SHEETS-SHEET 2.

V v f I Z WITNESSES HNVENTQR QVNW in eras arana onnron EDWIN F. HULBERT, OF SOUTH NORWALK, CONNECTICUT, ASSIGNOR T0 NATIONAL PAPER CAN COMPANY, OF NORWALK, CONNECTICUT, A CORPORATION OF DELA- WARE.

CLOSURE FOR PAPER RECEPTACLES.

Application filed December 1, 1913.

To all whom it may concern:

Be it known that I, EDWIN F. HULBERT, a citizen of the United States, residing at South Norwalk, Fairfield county, Connecticut, have invented a new and useful Improvement in Closures for Paper Receptacles, of which the following is 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; F ig. 4 is a perspective View of one of the caps removed; Fig. 6 is a vertical sectional view showing a modification; Fig. 7 is aside 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.

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 and down over the flange 4 and substantially parallel therewith, as shown in Fig. 2. An

annular depression or bead 6 (Fig. 3) is then rolled or pressed into the triple-ply wall thus formed. In forming this bead, the disk or cap 3 is expanded and firmly locked in .the wall of the receptacle, being held not only by its interlocking engagement with the groove formed in the said body, but also by the engagement therewith of the bead formed in the folded body portion 5.

I next 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 Specification of Letters Patent.

Patented Jan. 23, 191i 7.

Serial No. 803,914.

receptacle until its peripheral edge snaps into the annular depression 6, as shown in Fig. 5, the disk being preferably dished. As this disk possesses some resiliency, its natural tendency is to resume its original flat 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 of closure particularly adapted as a top closure, to permit 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, 1 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 groove, I avoid weakening the receptacle against end'wise 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 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 considerable shocks and blows which may begiven 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 in vention, the essential feature of which lies in folding the edge of the package body over the flange of the cap and the expanding of the parts with the locking action of the sec- .ondary cap, which firmly holds the flange and primary cap in place and gives a strong structure, braced against shocks or blows.

What I claim is:

1. The combination with a paper can or receptacle, of an outwardly flanged cap or disk within the end portion thereof, the flange of said cap or disk being held between the body of the receptacle and a portion thereof which is turned inwardly within said flange, said parts having a, locking groove formed therein and an auxiliary cap or disk seated within said groove and exerting an outward locking pressure thereon; substantially as described.

2. A paper can or receptacle having its end portion turned inwardly, a cap or disk having an outwardly turned flange held between the body of the receptacle and the inwardly turned portion thereof said parts having a locking groove formed therein .and

'a secondary cap or disk seatedwithin the said inturned portion and exerting an outward locking pressure on the parts; substantially as described.

3. A paper can or receptacle having an inturned end portion, an inner cap or closure member having an outwardly turned flange fitted between said inwardly turned portion and the wall of the body of the receptacle, and said 'parts having a locking bead or groove formed therein to lock the parts together, together with an auxiliary cap or closure whose peripheral edge is engaged with said groove and arranged to hold said parts in locked position; substantially as described.

4. A paper can or receptacle having an inturned end portion, an inner cap or closure member having an outwardly turned flange fitted between said inwardly turned portion and the wall of the body of the receptacle, and said parts having a locking bead or groove formed therein, together with an auxiliary cap or closure whose peripheral edge is engaged withsaid groove, the inner cap or closure having a central opening, and the outer cap or closure having an inset portion fitting within and closing said opening; substantially as described.

5. A paper can or receptacle having an inturned portion, a cap or closure member having an outwardly turned flange fitted between said inturned portion and the wall of the body of the receptacle, said parts being beaded to lock them to each other and provided with an annular groove in the inturned end portion, and an auxiliary bowed cap or closure sprung into said groove and arranged to hold the parts in position, substantially as described.

6. The combination with apaper can or receptacle of an outwardly flanged cap or disk within the end portion thereof, said end portion being turned inwardly over the disk flange, these three parts, namely the end wall of the receptacle, the flange of the disk and the inturned portion of the receptacle having a locking bead, and an auxiliary cap or disk outside the flanged cap and held by said bead.

7 The combination with a paper can or receptacle of an outwardly flanged cap or disk within the end portion thereof, said end portion being turned inwardly over the disk flange, these three parts, namely the end wall of the receptacle, the flange of the disk and the inturned portion of the receptacle having an outwardly formed locking bead having a groove on the interior thereof, and an auxiliary cap or disk outside the flanged cap and held by said groove.

8. The combination with a paper can or receptacle of an outwardly flanged cap or disk within the end portion thereof, said end portion being turned inwardly over the disk flange, and an auxiliary spring cap or disk outside the flanged cap engaging the turned portion the edge thereof being spaced from the main disk.

9. A can or receptacle having a paper body provided with a series of indentations forming a seat or bead, said indentations being formed by bent-in portions of the paper body wall and being spaced apart and separated by strut-like unbent portions of the paper body wall, and a cap or closure inserted in the end of the receptacle body and seated against such seat or 'bead, substantially as described.

In testimony whereof, I have hereunto set my hand.

EDWIN F. HULBERT.

Witnesses:

CHARLES F. GEHRMANN, ALFRED N. J OERG.

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