# US 4,392,580 A · Closure cap

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- Number: US 4,392,580 A
- Document ID: US4392580A
- Status: Granted
- Kind: A
- Application number: 06/285,610
- Filed: 1981-07-21
- Granted: 1983-07-12
- Earliest claimed: 1981-07-21
- Assignees: Anchor Hocking Corporation
- Inventors: Charles S. Ochs
- Web page: https://patentgrep.com/patent/US4392580A

## CPC

- B21D 51/44: Making closures, e.g. caps (folded of thin metal foils in the way of making paper caps B31D5/00; making closures in conjunction with applying same B67B)
- B21D 51/46: Placing sealings or sealing material {(moulding plastic sealing material into closure members B29C70/80)}
- B65D 41/0442: {Collars or rings (B65D41/0457 takes precedence)}
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES

## Abstract

A metal closure cap is described for sealing containers. It is of the lug type having a metal shell with a flowed-in gasket. The cap differs from prior twist caps of this general type by having a tapered corner between the cap top and the cap skirt. This corner design permits a reduced amount of metal to be used and further provides a more rigid closure corner permitting the use of lighter-weight metal. Improved methods of forming the cap shell, including the corner portion are also described.

## Claims

### Claim 1

In a closure cap having a metal shell with a cover and a depending skirt and having a flowed-in plastisol sealing gasket and inwardly projecting lugs formed on the bottom of the skirt for engaging lugs on a container the improvement comprising said cap skirt having a tapered upper portion extending downwardly and outwardly to the top of a generally cylindrical lower skirt portion, said sealing gasket being positioned in a downwardly facing channel extending radially outwardly to the top of said tapered skirt portion and said tapered upper portion having a radial dimension approximately equal to the radial width of the cap lugs and a vertical dimension greater than half the skirt height.

### Claim 2 (depends on 1)

The closure cap as claimed in claim 1 in which said container lugs have a radial width of approximately one-half that of said closure lugs.

### Claim 3 (depends on 1)

The closure cap as claimed in claim 1 in which said tapered upper skirt portion is straight.

### Claim 4 (depends on 1)

The closure cap as claimed in claim 1 in which said tapered upper portion is arcuate.

### Claim 5 (depends on 4)

The closure cap as claimed in claim 4 in which the upper skirt portion includes indentations.

### Claim 6 (depends on 1)

The closure cap as claimed in claim 1 in which said upper skirt portion includes indentations.

### Claim 7 (depends on 6)

The closure cap as claimed in claim 6 in which said indentations are closely and regularly spaced.

### Claim 8

A sealed package comprising the combination of a closure cap and a container where said container has a plurality of projecting lugs extending outwardly from a generally cylindrical rim portion and where said closure cap has a cover with a sealing gasket on its under surface and a depending skirt with inwardly projecting lugs on the skirt bottom engaging said container lugs the improvement comprising an improved cap skirt having a downwardly flaring upper skirt portion terminating in a generally cylindrical lower skirt portion, said upper flaring portion extending downwardly and outwardly from a position above the outer edge of said container rim portion to a position outwardly of said container lugs, said sealing gasket being positioned in a downwardly facing channel extending radially outwardly to the top of said tapered skirt portion and said tapered upper portion having a radial dimension approximately equal to the radial width of the cap lugs and a vertical dimension greater than half the skirt height.

### Claim 9 (depends on 8)

The package as claimed in claim 8 in which said container lugs have a radial width of approximately one-half that of said closure lugs.

### Claim 10 (depends on 8)

The package as claimed in claim 8 in which said tapered upper skirt portion is straight.

### Claim 11 (depends on 8)

The package as claimed in claim 8 in which said tapered upper portion is arcuate.

### Claim 12 (depends on 11)

The package as claimed in claim 11 in which the upper skirt portion includes indentations.

### Claim 13 (depends on 8)

The package as claimed in claim 8 in which said upper skirt portion includes indentations.

### Claim 14 (depends on 13)

The package as claimed in claim 13 in which said indentations are closely and regularly spaced.