Can lid

Patent metadata

Field	Value
Publication number	US-11780662-B2
Application number	US-201917259314-A
Country	US
Kind code	B2
Filing date	Apr 18, 2019
Priority date	Jul 12, 2018
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

A can lid is provided for excellence in an explosion-proof function and a suitability for a hammering inspection. A buckling-inducing section that is easily deformed angularly is formed on a plurality of sites in a circumferential portion of a panel section. A score line intersects with a virtual line passing through a center of the panel section and a center of the buckling-inducing section. End portions of the score line are situated closer to the center of the panel section than a virtual boundary line extending perpendicular to the virtual line. A circular depression is formed at the center of the panel section. A slant wall section is formed between the buckling-inducing section and an inner side wall, and the slant wall section is joined to the inner side wall through a curved portion.

First claim

The invention claimed is:

1. A can lid, comprising:
an annular groove that is depressed toward an inner surface of a panel section around the panel section;
a chuck wall that is formed around the annular groove while extending higher than an outer surface of the panel section;
a flange that is formed on a leading edge of the chuck wall while being curled to be seamed to an opening end a can trunk;
a buckling-inducing section that is thinned to be easily deformed angularly to protrude outwardly, and that is formed on a plurality of sites in a circumferential portion of the panel section close to the annular groove; and
a score line that intersects with a virtual line passing through a center of the panel section and a center of the buckling-inducing section, and that is easily to be ruptured, wherein
both end portions of the score line are situated closer to the center of the panel section than a virtual boundary line that is drawn perpendicular to the virtual line while passing through an end portion of the buckling-inducing section,
a circular depression that is depressed toward the inner surface of the panel section is formed at the center of the panel section, in such a manner that a radius of the circular depression reaches neither the score line nor the buckling-inducing section,
a slant wall section is formed between an outer end of the buckling-inducing section in a radial direction of the panel section and an inner side wall of the annular groove, and
the slant wall section is joined to the inner side wall through a curved portion having a predetermined curvature radius to protrude outwardly from the panel section.

2. The can lid as claimed in claim 1 , wherein each intersection between the score line and the virtual line is individually situated on the panel section radially outer side of the center of the buckling-inducing section on the virtual line.

3. The can lid as claimed in claim 1 , wherein the curvature radius of the curved portion is 0.5 mm or longer.

4. The can lid as claimed in claim 2 , wherein the curvature radius of the curved portion is 0.5 mm or longer.

Assignees

• Daiwa Can Co Ltd

Inventors

• Shiotani Masahiro
• Oyanagi Tomohiko

Classifications

• B65D79/0087 Primary

  the deformable part being located in a closure, e.g. in caps or lids · CPC title

• B65D43/14

  Non-removable lids or covers · CPC title

• B65D51/1638

  by means of an element bursting upon a predetermined pressure in the container being exceeded · CPC title

• B65D43/06 Primary

  having a peripheral channel embracing the rim of the container · CPC title

• B65D17/28

  at lines or points of weakness · CPC title