# US 4,397,402 A · Easy opening container lid

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- Number: US 4,397,402 A
- Document ID: US4397402A
- Status: Granted
- Kind: A
- Application number: 06/253,766
- Filed: 1981-01-09
- Granted: 1983-08-09
- Earliest claimed: 1981-01-09
- Inventors: Taniuchi Keiji
- Web page: https://patentgrep.com/patent/US4397402A

## CPC

- B65D 17/401: {characterised by having the line of weakness provided in an end wall}
- B65D 2205/00: Venting means
- 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 present invention provides an easy-opening container lid, having a tear member which is lifted and removed by a small, hard piece, such as a coin, etc. This container lid is specially constructed such that both the container lid body and tear member can be assured with respect to the safety thereof after the container lid has been opened. The container lid is provided with a pressure removing score so as to prevent accidents from occurring due to the internal pressure of the container when the container lid is opened.

## Claims

### Claim 1

An easy-opening container lid, comprising a container lid body made of a thin plate and having a tear portion which consists of an annular, cross-sectionally U-shaped or rectangular groove formed by deep drawing, the bottom wall of which is folded in three layers and caulked, and which is provided with a score on the outer surface of the folded bottom wall; and a tear member having a double-layer side wall also constituting an inner wall of said annular groove, which inner wall thereby forms an annular, uprightly extending double-layer flange, and a recess in the central portion of said tear member, said container lid being characterized in that a tear end of said tear portion and a tear end of said tear member which are left on a container body after said container lid has been broken along said score by inserting a small, hard piece into said annular groove and inclining the same to press the inner wall thereof are assured with respect to the safety thereof.

### Claim 2 (depends on 1)

An easy-opening container lid according to claim 1, wherein said score is provided not continuously in a circular direction but interrupted at certain points.

### Claim 3 (depends on 1)

An easy-opening container lid according to claim 1, wherein said score is provided not continuously in a circular direction but interrupted at certain points; and a pressure removing score is provided in the discontinuous portion of said circular score.

### Claim 4

An easy-opening container lid, comprising a container lid body made of a thin plate and having a tear portion which consists of an annular, cross-sectionally U-shaped or rectangular groove formed by deep drawing, the bottom wall of which is folded in three layers and caulked, and which is provided with a score on the outer surface of the folded bottom wall, said container lid being characterized in that said score is provided not continuously in a circular direction but interrupted at certain points with a pressure removing score provided in the discontinuous portion of said circular score.