Easily openable container lid

Abstract

A container lid is configured such that repeated movement of a grip piece and a connecting piece of the lid will not break the connecting piece so that the lid can be removed easily. An extension section extends upwardly from an upper end of the connecting section along an inner peripheral surface of a skirt wall of the lid. When the container lid is on the mouth-neck section of a container, an upper end part of the extension section is sandwiched between an inner peripheral surface of the lid skirt wall and an outer peripheral surface of a locking projection on the container mouth-neck section.

Claims

1. An easily openable container lid for a container having a mouth-neck section having an annular locking projection formed at an upper end part of the mouth-neck section, the locking projection having an outer peripheral surface protruding radially outwardly to have, in a vertical sectional view, an arcuate shape with a diameter gradually increasing downwardly, and having a lower surface with a diameter gradually decreasing downwardly, the container lid comprising: a shell made of a thin metal plate which has a circular top panel wall, a skirt wall hanging down from a peripheral edge of the top panel wall, and a connecting piece extending out from a lower end of the skirt wall in a predetermined region in a circumferential direction, the shell being formed with a pair of scores extending upwardly from the lower end of the skirt wall on both sides of the predetermined region to the top panel wall; a grip piece formed from a synthetic resin which is connected to the connecting piece, the grip piece having a connecting section surrounding the connecting piece at least partially, and a grip section extending out from the connecting section; and an extension section extending out upwardly from an upper end of an inner surface of the connecting section along an inner peripheral surface of the skirt wall, wherein when the container lid is fitted onto the mouth-neck section, an upper end part of the extension section is located opposite the outer peripheral surface of the locking projection, when a lower end part of the skirt wall is deformed radially inwardly, the upper end part of the extension section becomes sandwiched between the inner peripheral surface of the skirt wall and the outer peripheral surface of the locking projection, and when the lower end part of the skirt wall is moved away from the locking projection while the container lid is removed from the mouth-neck section, the upper end part of the extension section moves downwardly along the locking projection outer peripheral surface into intimate contact with the lower surface of the locking projection or with the mouth-neck section below the locking projection lower surface, whereby when breakage of the pair of scores proceeds, the upper end part of the extension section separates from the mouth-neck section.

2. The container lid according to claim 1, wherein at least the upper end part of the extension section of the grip piece is in a state of non-adhesion or weak adhesion to the inner peripheral surface of the skirt wall.

3. The container lid according to claim 2, wherein a whole of the extension section of the grip piece is in the state of non-adhesion or weak adhesion to the inner peripheral surface of the skirt wall.

4. The container lid according to claim 1, wherein at least the upper end part of the extension section of the grip piece extends arcuately in the circumferential direction along an inner surface of the skirt wall, and has a wall thickness of 0.2 to 0.5 mm.

5. The container lid according to claim 4, wherein at least the upper end part of the extension section of the grip piece has a uniform thickness throughout.

6. The container lid according to claim 1, wherein the grip piece is molded from a rigid synthetic resin having a Shore D hardness of 55 to 73.

7. The container lid according to claim 1, wherein the shell is formed from a thin aluminum-based alloy plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a preferred embodiment of a container lid configured in accordance with the present invention.

(2) FIG. 2 is a perspective view of the container lid shown in FIG. 1 which is in an inverted state.

(3) FIG. 3 is a sectional view of the container lid shown in FIG. 1.

(4) FIG. 4 is a view showing a state in which the container lid shown in FIG. 1 has been fitted onto a mouth-neck section.

(5) FIG. 5 is a view showing a state in which a lower end part of a skirt wall has been deformed radially inwardly from the state shown in FIG. 4.

(6) FIG. 6 is a view showing a state in which a grip piece has been somewhat moved radially outwardly or upwardly from the state shown in FIG. 5.

(7) FIG. 7 is a view showing a state in which the grip piece has been further moved radially outwardly or upwardly from the state shown in FIG. 6.

MODE FOR CARRYING OUT THE INVENTION

(8) The present invention will now be described in further detail by reference to the accompanying drawings showing a preferred embodiment of an easily openable container lid configured in accordance with the present invention.

(9) With reference to FIGS. 1 to 3, the illustrated container lid, entirely indicated at 2, is equipped with a shell 4 made of a thin metal plate, and a grip piece 6 formed from a synthetic resin.

(10) The shell 4 is composed of a circular top panel wall 8, a cylindrical skirt wall 10 hanging down from the peripheral edge of the top panel wall 8, and a connecting piece 12 extending out from the lower end of the skirt wall 10 in a predetermined region in a circumferential direction. A main portion of the top panel wall 8 extends substantially horizontally, a main portion of the skirt wall 10 extends substantially vertically, and a boundary region between the top panel wall 8 and the skirt wall 10 extends radially outwardly and downwardly in an arcuate shape in FIG. 3 which is a vertical sectional view. The connecting piece 12 has a vertical section 12a extending substantially vertically downwardly from the lower end of the skirt wall 10, and an inclined section 12b extending out downwardly, while slanting radially outwardly, in succession to the vertical section 12a. On both sides of the predetermined region where the connecting piece 12 is disposed, notches 16a and 16b are formed in a lower end part of the skirt wall 10. Scores 18a and 18b, as a pair, extending from the notched 16a and 16b, respectively, are formed in the skirt wall 10 and the top panel wall 8. Each of the paired scores 18a and 18b has a first part extending from the lower end of the skirt wall 10 to the upper end of the skirt wall 10 in succession to the notch 16a or 16b, a second part extending in a peripheral edge portion of the top panel wall 8 following the first part, and a third part following the second part and further extending out into the skirt wall 10. The shell 4 as described above can be integrally formed by applying suitable machining, such as punching or drawing, to a suitable thin metal plate such as a thin aluminum-based alloy plate, a chromic acid-treated thin steel plate, or a thin tin plate. The paired scores 18a and 18b can be formed by making a tool act on the thin metal plate from its face or back, thereby reducing its thickness.

(11) As will be understood by referring to FIGS. 2 and 3, a liner 20 is disposed on an inner surface of the top panel wall 8 of the shell 4. The liner 20 is formed by supplying a suitable synthetic resin material, such as flexible polyethylene, to the inner surface of the top panel wall 8 of the shell 4, and embossing the synthetic resin material with a desired shape. The liner 20 is disk-shaped as a whole, and has two annular ridges, i.e., an outer annular ridge 22 and an inner annular ridge 24, in a peripheral edge portion thereof.

(12) Further referring to FIGS. 1 to 3, the grip piece 6 has a connecting section 26 surrounding the connecting piece 12 of the shell 4 at least partially, and a grip section 28 extending out from the connecting section 26. In the illustrated embodiment, the connecting section 26 of the grip piece 6 surrounds most of the inclined section 12b of the connecting piece 12. The so configured grip piece 6 is injection-molded or compression-molded from a suitable synthetic resin material such as polypropylene or polyethylene, preferably a synthetic resin having a Shore D hardness of 55 to 73, with the use of the connecting piece 12 of the shell 4 as a so-called core, and can thereby be coupled to the connecting section 26 simultaneously with the molding.

(13) In the container lid 2 of the present invention, it is important for the grip piece 6 to include an extension section 30 extending out upwardly over a required length along an inner peripheral surface of the skirt wall 10 from the upper end of an inner surface of the connecting section 26. Advantageously, the extension section 30 extends arcuately in a circumferential direction along the inner peripheral surface of the skirt wall 10, and at least an upper end part of the extension section 30, preferably the entire extension section 30, has a thickness of the order of 0.2 to 0.5 mm. In the illustrated embodiment, the circumferential length of the extension section 30 gradually decreases upward, and the extension section 30 is in a trapezoidal shape as a whole. It is important that the length of upward extension of the extension section 30 be a dimension which establishes such a relation that the upper end part of the extension section 30 is locked to a locking projection of a mouth-neck section of a container on which the container lid 2 is to be mounted. For example, the upward extension length of the extension section 30 is advantageously of the order of 5 to 6 mm. It is important that the connecting section 26 of the grip piece 6 be firmly connected to the connecting piece 12 of the shell 4. Thus, the connecting section 26 is desirably joined to the connecting piece 12, while the extension section 30 of the grip piece 6 is preferably in a state of non-adhesion or weak adhesion to the inner peripheral surface of the skirt wall 10. To bring the extension section 30 into the state of non-adhesion or weak adhesion to the inner peripheral surface of the skirt wall 10, it is recommendable, for example, to apply a coating, which is non-adherent or weakly adherent to the synthetic resin material making up the grip piece 6, to the site of the thin metal plate forming the shell 4 which the extension section 30 is located to oppose, before molding the grip piece 6 with the use of the connecting piece 12 of the shell 4 as a so-called core. To the site of the connecting piece 12 surrounded by the connecting section 26 of the grip piece 6, it is possible to apply a coating having adhesiveness to the synthetic resin material forming the grip piece 6.

(14) FIG. 4 shows, together with the container lid 2, a mouth-neck section 32 of a container fitted with the container lid 2. The mouth-neck section 32 of the container, which can be formed from glass or a suitable synthetic resin such as polyethylene terephthalate, is in a nearly cylindrical shape as a whole, and an upper end part of its outer peripheral surface is formed with an annular locking projection 34 protruding radially outwardly. The outer peripheral surface of the locking projection 34 of the mouth-neck section 32 has a diameter gradually increased downward, and is in an arcuate shape in a vertical sectional view. A lower surface of the locking projection 34 of the mouth-neck section 32 has a diameter gradually decreased downward, and is in an arcuate shape in a vertical sectional view. Am arcuate concavity is formed in a region ranging from the lower surface of the locking projection 34 to the outer peripheral surface of the mouth-neck section 32 below this lower surface.

(15) To mount the container lid 2 on the mouth-neck section 32 of the container, it is important that the upper end part of the extension section 30 of the grip piece 6 be located above the lower end of the locking projection 34 of the mouth-neck section 32 and opposite the outer peripheral surface of the locking projection 34, with the container lid 2 being fitted onto the mouth-neck section 32 as illustrated in FIG. 4. In the illustrated embodiment, the upper end of the extension section 30 of the grip piece 6 is located opposite a lower end part of the outer peripheral surface of the locking projection 34 of the mouth-neck section 32. In mounting the container lid 2 on the mouth-neck section 32 of the container filled with beer or a gas-containing liquid such as a carbonated beverage, the container lid 2 is fitted onto the mouth-neck section 32 as illustrated in FIG. 4, and then a lower part of the skirt wall 10 of the shell 4 is deformed radially inwardly, with the container lid 2 being kept pressed downward as illustrated in FIG. 5, whereby the lower part of the skirt wall 10 is locked to the locking projection 34 of the mouth-neck section 32. By so doing, the upper end part of the extension section 30 of the grip piece 6 is sandwiched between the inner peripheral surface of the skirt wall 10 and the outer peripheral surface of the locking projection 34 and, in the illustrated embodiment, between the inner peripheral surface of the skirt wall 10 and the lower end part of the outer peripheral surface of the locking projection 34.

(16) In removing the container lid 2 from the mouth-neck section 32 to unseal the mouth-neck section 32 for consumption of the contents, a finger is hooked over the grip section 28 in the grip piece 6 of the shell 4 to move the grip piece 6 radially outwardly or upwardly, as illustrated in FIG. 6. Even if, on this occasion, an undesirable operation is performed, namely, the radially outward or upward movement of the grip piece 6 and the radially inward or downward movement of the grip piece 6 are repeatedly performed, the portion in the connecting piece 12 of the shell 4 which is not surrounded by the connecting section 26 of the grip piece 6, namely, the vertical section 12a or the boundary between the vertical section 12a and the inclined section 12b, is lined with and reinforced with the extension section 30 of the grip piece 6. Thus, the portion in the connecting piece 12 of the shell 4 which is not surrounded by the connecting section 26 of the grip piece 6 is inhibited from being excessively bent there, and is sufficiently prevented from being broken there. Assume that, in the above-mentioned predetermined region, the lower end part of the skirt wall 10 is moved away from the locking projection 34 of the mouth-neck section 32 by moving the grip piece 6 radially outwardly or upwardly. In this case, if at least the upper end part of the extension section 30 of the grip piece 6 is in a state of non-adhesion or weak adhesion to the inner surface of the skirt wall 10, at least the upper end part of the extension section 30 of the grip piece 6 is released from sandwiching between the inner peripheral surface of the skirt wall 10 and the outer peripheral surface of the locking projection 34, is then moved downward from the outer peripheral surface of the locking projection 34, and is finally brought into intimate contact with the lower surface of the locking projection 34, or with the arcuate concavity in the outer peripheral surface of the mouth-neck section 32 below this lower surface, as illustrated in FIGS. 6 and 7. When the grip piece 6 is further moved radially outwardly or upwardly, breakage of the paired scores 18a and 18b formed in the shell 4 proceeds. As a result, the locking of the lower end part of the skirt wall 10 of the shell 4 to the annular locking projection 34 of the mouth-neck section 32 is released, and the container lid 2 is removed from the mouth-neck section 32. During the radially outward or upward movement of the grip piece 6, the leading end of the extension section 30 in intimate contact with the lower surface of the locking projection 34 or the outer peripheral surface of the mouth-neck section 32 below this lower surface functions as a so-called fulcrum of a lever, promoting the radially outward or upward movement of the grip piece 6. When the breakage of the paired scores 18a and 18b proceeds, the extension section 30 is separated from the mouth-neck section 32.

EXPLANATIONS OF LETTERS OR NUMERALS

(17) 2: Container lid

(18) 4: Shell

(19) 6: Grip piece

(20) 8: Top panel wall

(21) 10: Skirt wall

(22) 12: Connecting piece

(23) 18a, 18b: A pair of scores

(24) 26: Connecting section

(25) 28: Grip section

(26) 30: Extension section

(27) 32: Mouth-neck section

(28) 34: Locking projection