US1837047A

US1837047A - Crown cap for bottles

Info

Publication number: US1837047A
Application number: US394472A
Authority: US
Inventors: Hoffmann Leonard
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-09-23
Filing date: 1929-09-23
Publication date: 1931-12-15
Anticipated expiration: 1948-12-15

Description

' Dec. 15, 1931. 1 M N 1,837,047

CROWN CAP FOR BOTTLES Filed Sept. 23, 1929 Patented Dec. 15, 1931 I UNITED STATES Leeann norrmlmmor PHILADELPHIA, PENNSYLVANIA cnown car non BOTTLES Application filed September 23, 1929. Serial I To. 394,472.

The present invention relates to bottle closures of the crown cap type wherein a plurality of sealing zones are established between the cork lining or packing of the cap and the cap seating surfaces at the mouth of the bottle after the cap has been aflixed to the bottle by the skirted crimped flange thereof. I have found from practical tests that if the bodyowing to the varying thicknesses of the walls of the mouths of bottles, a crown cap having $0 a depression formed therein prior to its application to the bottle should, in order to form a more perfect seal, have its cork lining or packing normally retained in a convex form throughout, and further, it is necessary that such depression within the cap not only retain the cork in a convex form but cause the latter to be retained in seating contact with the inner surface of the mouth of the bottle after the body ortion'of the cap has been distorted, which latter is caused by the capper applying pressure to the skirted.

crimped flange when sealing the cap to the bottle. Therefore, it is an object of the present invention to provide a crown cap with a central depression capable of extending within the mouthof a bottle and which, prior to its application to the bottle, will normally retain the cork in a convex form and after its application to the mouth of the bottle, will '9 retain the cork lining or packing in seating contact with not only the inner surface but over the entire seating surface at the mouth of the bottle.

Another object of the invention is to provide in a crown cap means whereby the cork lining thereof is concave so as to seat within the mouth of the bottle and afford a greater surface contact between the work and the mouth of ,the bottle whereby a more perfect seal is formed. 7

PATENT OFFICE With the above and such other objects'in v ew as may hereinafter'more fully appear, I have invented the device shown in the accompanying drawings in which:

Figure 1 1s a planview of myimproved bottle cap;

Figure 2 is a sectional view taken on the line 2-2 of Figure 1 showing the cap posi! tioned upon the mouth of a bottle, which latter is also in section, before the application of ressure to the cap;

igure 3 is a similar view showing the cap after it has been scaled or capped to the bote; v I v Figure 4 is an enlarged detail sectional view of the cap inthe position as shown in Figure 2, and

Figure 5 is another enlarged detail section al view showing the cap when in the sealed position as shown in Figure3.

Like reference characters indicate like parts throughout the following specification, arid in the several views-in the drawings in which 1 indicates a bottle cap or closure of the crown type, comprising a metal cap 2, having a clamped flange 3, depending therefrom, which is adapted to be compressed around the mouth of a bottle whereby the cork lining or disk 4, seated within the cap, will be held tightly pressed against the rim 5 of the mouth 6 of the bottle. The central portion 7 of the cap 2, is depressed to a plane below the annular edge 8 of the cap thus pro-' viding a concaved top wall 9 for the cap which wall depresses the disk 4 into the mouth of the cap when the cap is pressed upon the bottle. The body'portion of the cap as is illustrat ed in Figures 1 and 2 of the drawings, and prior to its application to the mouth of a bottle, is entirely depressed fromits outer edge or rim 8 in substantially an inverted truncated conical form, and owingto this particular formation of the body portion of the cap, the cork disk 4 is normally retained in a convex-concave form. 'In tie manufacture of glass b0ttles, the walls thereof are'not of uniform thickness and consequently, the mouths of the bottles vary in diameter. By

providing a convex packing disk it is obvious i that such a disk will readily seat itself within the mouths of bottles having varying di ameters. In the application of thecap to the bottle, pressure is applied to the outer rim 8 as well as the skirted crimped flange 3 by the ordinary capping machine, whereupon the flange 3 will be forced into binding engagement with the outer surface of the bottle and the body portion of the cap distorted or stretched due to this application of pressure, until it assumes the position as is illustrated in Figure 3 of the drawings. From this Figure 3 of the drawings, it will also be noted that after the application of the cap to the bottle, the marginal edges of the cork lining will be retained in sealing contact over the rim 5 of the mouth of the bottle, establishing one sealing zone, whereas the depressed portion of the cap will force this cork lining into sealing engagement with the inner surface of the mouth of the bottle, thereby establishing another sealing zone. Owing to the fact that the cork lining is normally retained in a convex form, the medial portion thereof is retained out of engagement with the central portion or flat wall 7 of the-cap and the partial vacuum created within the bottle after the application of the cap thereto, w ll have a tendency to draw the cork lining into the mouth of the bottle in the manner as shown in Figure 3 of the drawings, establishing a greater sealing zone between the cork lmmg and the inner surface of the mouth of the bottle, and which sealing zone is maintalned due to the conical shape of the body portion of the cap.

In Figure 4 of the drawings, I have shown an enlarged detail View of the cap when first positioned upon the mouth of the bottle, as shown in Figure 2, 'and from this Figure t of the drawings, it is apparent that o w1ng to the colwex form of the cork lining prior to its application to the bottle, that sealing zones are first established at the upper inner edge of the inner wall of the bottle, and'the cork lining at the zone indicated by the numeral The dotted lines 12 are to represent the various thicknesses of the walls of the bottle, which latter is caused during the manufacture of the same, and owing to the convex form of this cork lining, it is quite obvious that varying sealing zones may be readily est-ablished. In the application of the cap to the bottle, the usual capper is employed, whereupon pressure is applied to the marginal rim 8 and the skirted crimped flange 3 of the cap, whereby the marginal edge 8 will he first pressed down over the rim 5 of the bottle in the manner as'is shown in Figure 5 of the drawings, and finally, the-crimped llange 3 engages under this rim 5 for hold: ing the cap to the bottle. From.this, it is also apparent that the cork lining 4 will be forced over the entire upper seating surface the fact that this cork lining is out of contact with the flat wall 7 of the cap, this cork lining will not only be forced down into the bottle but will be forced against the inner wall 10 thereof.

Having described my invention, thatv which I claim to be new and desireto procure by Letters Patent is:

.1. A crown cap formed from a single piece of sheet metal, comprising a circular body portion, askirted crimped flange projecting downwardl from the outer marginal edge of said ody portion, said body portion being entirely depressed beginning at the outer marginal edge thereof in a sub stantially inverted truncated conical form providing a small fiat lower wall concentric with the outer rim of the body portion, a cork disk secured to the lower face of said body portion and normally retained in a convex form by the inverted truncated conical depression of said circular bodyportion.

2. The combination with a bottle having a mouth with a cap seating surface extending from the inner side of the bottle adjacent to the mouth around the latter and down on the outer side thereof, of a sheet metal cap of "the crown type which prior to its application to the bottle is formed to produce a ody the entire portion of which is substantially of an inverted truncated conical configuration having a lowerconcentric flat wall of less diameter than that of the mouth of the bottle, a skirted crimped flange formed with and depending from the outer marginal edge of said body portion of the cap for engaging the outer side of the bottle when the cap is applied thereto, a cork disk secured to the lower face of the body portion of the cap and which prior to its application to the bottle being normally retained in convex form, said cap when applied to the bottle will cause said cork disk to extend into the mouth thereof and said body portion retaining a portion of its original inverted truncated conical form after application of the cap to the bottle whereby said cork disk will be held in seating contact with said inner seating surface adjacent the mouth of the bottle.

In testimony whereof I affix my signature.

' LEONARD HOFFMANN.

of the rim 5 of the bottle, thereby establish