# US 2011/0031255 A1 · Structure of clinch portion of mounting cup

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- Number: US 2011/0031255 A1
- Document ID: US20110031255A1
- Status: Published application
- Kind: A1
- Application number: 12/988,681
- Filed: 2009-04-17
- Published: 2011-02-10
- Earliest claimed: 2008-04-25
- Assignees: Toyo Seikan Kaisha, Ltd.; Toyo Aerosol Industory Co. Ltd.
- Inventors: Minoru Tasaki; Sunao Morishita; Kouji Kinoshita; Takaho Kumai
- Web page: https://patentgrep.com/patent/US20110031255A1

## CPC

- B65D 83/38: Details of the container body (pressure relief devices B65D83/70)
- 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

The structure of a clinch portion of a mounting cup is provided which can retain a gasket reliably between a curl portion and a can bead, prevent extrusion of the gasket, and obtain a reliable seal. The clinch portion includes a curl portion 7 continuous with an upper end of an outer circumferential wall 6 at an inner circumferential edge of the curl portion, and a curl skirt portion having an upper end continuous with an outer circumferential edge of the curl portion, respectively of the mounting cup 1 and being concentric relative to a center line 2. The curl portion 7 is made of a plurality of curved planes having different radii extending from the inner circumferential edge to outer circumferential edge. A space 31 a portion of the gasket 34 can enter is formed between a virtual curved plane 27 with a radius constituting the inner plane of the curl portion and an inner curved plane 25 or an outer curved plane 26, or between the virtual curved plane and both the inner and outer curved planes.

## Claims

### Claim 1

A structure of a clinch portion of a mounting cup for holding a gasket of said mounting cup clinching a can bead, wherein:
said clinch portion includes a curl portion continuous with an upper end of an outer circumferential wall at an inner circumferential edge of said curl portion, and a curl skirt portion having an upper end continuous with an outer circumferential edge of said curl portion, respectively of said mounting cup and being concentric relative to a center line of said mounting cup;
an inner plane of said curl portion is formed including a curved plane in an inner portion on a side of said inner circumferential edge and a curved plane in an outer portion on a side of said outer circumferential edge; and
a space a portion of said gasket can enter is formed between a virtual curved plane with a single radius constituting the inner plane of said curl portion and a curved plane in said inner portion and/or a curved plane in said outer portion.

### Claim 2 (depends on 1)

The structure of a clinch portion of said mounting cup according to claim 1, wherein a radius of said curved plane in said inner portion and/or said outer portion is set shorter than the radius of said virtual curved plane.

### Claim 3 (depends on 1)

The structure of a clinch portion of said mounting cup according to claim 1, wherein a radius of said curved plane in said outer portion is different from a radius of said curved plane in said inner portion.

### Claim 4 (depends on 1)

The structure of a clinch portion of said mounting cup according to claim 1, wherein an outer diameter of an upper portion of said outer circumferential wall on a side of said curl portion is set larger than an outer diameter of a lower portion continuous with the upper portion to narrow a clearance between said upper portion and said can bead.