JP7257084B1 - metal can - Google Patents

Abstract

[Problem] When a container body filled with a water-based paint is covered with a lid and shipped and transported as a product, the water-based paint adheres to the tip surface of the curled portion, which is not sufficiently rust-proofed, due to vibrations, etc. during transportation. To solve the problem that the tip surface of a curled part and its surroundings are rusted, and the metal can and the water-based paint are deteriorated or deteriorated. A metal can (1) according to the present invention comprises a container body (2) formed by winding a top plate (23) having an opening (20) and a bottom plate (22) at both upper and lower ends of a cylindrical can body (21), and a top plate. and a lid body 3 that detachably closes the opening 20 of 23 . An inward flange portion 27 protruding radially inward is formed on the peripheral portion of the opening 20 . The inward flange portion 27 is formed with a curled portion 28 that is wound inward by folding the extended portion outward in the radial direction. The curled portion 28 comprises at least one corner 41,42. The corner portions 41 and 42 abut on the inward flange portion 27 . [Selection drawing] Fig. 9

Description

TECHNICAL FIELD The present invention relates to a metal can for containing contents such as paints and chemicals.

Conventionally, metal cans used as containers for paints, chemicals, etc. are composed of a cylindrical can body with a top plate having an opening and a bottom plate rolled up at the upper and lower ends of the can body, and a top plate. and a lid that detachably closes the opening (see, for example, Patent Literature 1, etc.). In the metal can described in Patent Literature 1, a curled portion is formed in the peripheral portion of the opening of the top plate, which is bent inward in the radial direction to form a spiral cross-sectional shape. The tip surface of the curled portion is located on the inner side of the container body. Metal cans of this type are usually treated to prevent rust. However, in many cases, the antirust agent is not sufficiently applied to the end face portion (for example, the tip end face of the curl portion described above).

JP-A-2002-37251

By the way, in recent years, water-based paints have been used more and more as paints, which are one example of items to be contained in metal cans. In this case, when the main body of the container filled with the water-based paint is covered with a lid and shipped and transported as a product, the water-based paint adheres to the tip surface of the curled portion where the anti-corrosion treatment is not sufficient due to vibrations during transportation. There is a problem that the tip surface of the curled portion and its surroundings are rusted, and the metal can and the water-based paint are deteriorated or deteriorated.

An object of the present invention is to provide a metal can that has been improved in consideration of the above-mentioned current situation.

The present invention comprises a container body constructed by winding a top plate having an opening and a bottom plate on both upper and lower ends of a cylindrical can body, and a lid body detachably covering the opening of the top plate. In the metal can, an inward flange projecting radially inward is formed on the peripheral edge of the opening, and the inward flange extends radially from the inward flange. A curled portion is formed which is folded outwardly and rolled inwardly, the curled portion having at least one corner portion, and the corner portion abuts the inwardly directed flange portion.

In the metal can of the present invention, the top plate has a downward recessed fitting recess surrounding the opening on the outer peripheral side of the opening. A downwardly protruding fitting projection that is detachably fitted into the fitting recess is formed, and when the container body is closed with the lid, a flat plate on the inner diameter side of the fitting projection is formed in the lid. and a curved portion of the curled portion formed on the far side from the inward flange portion.

According to the invention of the present application, even if an object such as a liquid adhering to the back surface of the lid attempts to enter the curled portion, the abutting portions between the corners of the curled portion and the inward flange serve as barriers. It can block the infiltration of contents. For this reason, even if the stored material is water-based, it is possible to greatly suppress the possibility that the stored material will adhere to the tip surface of the curled portion and cause rust.

It is a schematic perspective view which shows the container main body of embodiment of this invention. It is a partly notched reference perspective view which shows the container main body of embodiment of this invention. It is a front view concerning an embodiment of the invention in this application. It is a rear view which concerns on embodiment of this invention. It is the right and left side view which concerns on embodiment of this invention. It is a top view concerning an embodiment of the invention in this application. It is a bottom view concerning an embodiment of the invention in this application. It is a sectional view concerning an embodiment of the invention in this application. 1 is a partially enlarged view of a first embodiment of the present invention; FIG. It is the elements on larger scale in 2nd Example of this invention. It is the elements on larger scale in 3rd Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, terms indicating directions such as up and down, left and right are terms for convenience based on the states shown in the drawings, and are not intended to limit the technical scope of the present invention.

First, the metal can 1 of the embodiment will be described. As shown in FIG. 1 , the metal can 1 of the embodiment includes a cylindrical container body 2 that opens upward, and a lid 3 that closes the opening 20 of the container body 2 . The container body 2 is composed of a cylindrical can body 21 , a bottom plate 22 attached to the lower end of the can body 21 , and a top plate 23 attached to the upper end of the can body 21 . The bottom plate 22 is connected to the lower end of the can body 21 by seaming. The top plate 23 is connected to the upper end of the can body 21 by seaming. A connecting portion between the can body 21 and the bottom plate 22 on the lower end side is configured as a lower seaming portion 24 . A connecting portion between the can body 21 and the top plate 23 on the upper end side is constituted by an upper seaming portion 25.例文帳に追加For example, after joining one end of a rectangular metal plate to the other end to form a cylindrical can body 21, the bottom plate 22 and the top plate 23 are wound around the upper and lower ends of the can body 21. Then, the container body 2 is assembled.

As shown in FIGS. 1 and 9, an annular opening 20 is formed on the central side of the top plate 23 . A fitting concave portion 26 having a downward concave shape (U-shaped cross section) surrounding the opening portion 20 is formed by bending on the outer peripheral side of the opening portion 20 . The fitting recess 26 is formed in a ring shape in plan view surrounding the opening 20 of the top plate 23 . On the other hand, the lid 3 closing the opening 20 of the top plate 23 is formed in a substantially disk shape. The cover 3 is bent to form a downward convex fitting projection 36 that is detachably fitted into the fitting recess 26 of the top plate 23 . The fitting convex portion 36 of the lid 3 is also formed in an annular shape in plan view corresponding to the fitting concave portion 26 of the top plate 23 .

The fitting projection 36 of the lid 3 is fitted into the fitting recess 26 of the top plate 23 from above, and the opening 20 of the container body 2 is closed with the lid 3. As a result, the metal can 1 is sealed. The main body 2 is sealed with the lid 3). As described above, the metal can 1 of the embodiment includes a container body 2 formed by winding a top plate 23 having an opening 20 and a bottom plate 22 at both upper and lower ends of a cylindrical can body 21, and a top plate. It is provided with a lid body 3 that detachably closes the opening 20 of 23 .

An inward flange portion 27 that protrudes radially inward is formed continuously with the fitting recess 26 on the inner diameter side of the fitting recess 26 on the top plate 23 . The inward flange portion 27 of the embodiment includes a horizontal piece portion 27a formed by bending the upper end of the inner wall portion 26a on the radially inner side of the fitting recess 26 in a diameter-reducing direction, and a vertical piece portion 27a formed by bending upward from the horizontal piece portion 27a. It is composed of a piece portion 27b. Therefore, the inward flange portion 27 has an L-shaped cross section with the horizontal piece portion 27a and the vertical piece portion 27b.

A curled portion 28 having a spiral cross section is arranged on the inward flange portion 27 on the inner diameter side of the fitting recess 26 on the top plate 23 . The curled portion 28 of the embodiment is formed in a shape (a spiral cross-section) in which the extended portion of the vertical piece portion 27b of the inward flange portion 27 is folded radially outward and wound inward. That is, the curled portion 28 is formed continuously with the longitudinal piece portion 27b of the inward flange portion 27 . A front end surface 40 on the inner diameter side of the top plate 23 is positioned in a first sealed space S1 (details will be described later) surrounded by the curled portion 28 on the inner side of the cross section.

The curled portion 28 has at least one corner. The curled portion 28 of the embodiment has two corners 41 and 42 called first and second corners at a location near the inward flange portion 27 . The first corner portion 41 abuts on the horizontal piece portion 27 a of the inward flange portion 27 . The second corner portion 42 abuts on the vertical piece portion 27 b of the inward flange portion 27 . Since the second corner portion 42 is in contact with the vertical piece portion 27b of the inward flange portion, the space S1 on the inner side of the cross section surrounded by the curled portion 28 is in a sealed state (the first sealed space S1). ing). A tip surface 40 on the inner diameter side of the top plate 23 is accommodated in the first sealed space S1. In addition, in the embodiment, the second corner portion 42 abuts the vertical piece portion 27b of the inward flange portion, and the first corner portion 41 abuts the horizontal piece portion 27a of the inward flange portion. The space S2 on the inner side of the cross section surrounded by the first corner portion 41 to the second corner portion 42 and the inward flange portion 27 is also in a sealed state (is a second sealed space S2). .

For example, even if the liquid adhering to the back surface of the lid body 3 as a contained object tries to enter the curled portion 28 from outside the curled portion 28 along the fitting convex portion 36 or the like, the first corner portion 41 of the curled portion 28 The abutting portion of the inward flange portion 27 and the lateral piece portion 27a serves as a first barrier to block the infiltration of liquid. Further, the abutting portion between the second corner portion 42 of the curled portion 28 and the vertical piece portion 27b of the inward flange portion 27 serves as a second barrier to block the infiltration of liquid. Therefore, the curl portion 28 and the inward flange portion 27 can form a double junction. Even if the liquid to be stored is water-based, it is possible to greatly suppress the risk of the liquid adhering to the tip surface 40 in the first sealed space S1, which is located further inside the second sealed space S2, and causing rust. Even if the liquid passes through the contact portion between the first corner portion 41 of the curled portion 28 and the horizontal piece portion 27a of the inward flange portion 27, the second checkpoint, that is, the curled portion 28, would not pass through. The abutting portion between the second corner portion 42 and the vertical piece portion 27b of the inward flange portion 27 not only blocks the infiltration of the liquid, but also the second sealed space S2 serves as a liquid pool space to form the first sealed space. It is possible to more reliably suppress the risk of liquid entering S1.

The curled portion 28 of the embodiment is configured such that the extension portion (the portion to be the curled portion 28) is connected to the vertical piece portion 27b of the inward flange portion 27, and the pair of metal fittings are vertically extended from the vertical direction in which the vertical piece portion 27b extends. By sandwiching between the molds, the extended portion of the vertical piece portion 27b is curled while being folded radially outward. Then, the sandwiching process between the pair of upper and lower molds is advanced, and the end surface 40 on the inner diameter side of the top plate 23 is abutted and bent in order from the horizontal piece 27a to the vertical piece 27b of the inward flange 27. The curled portion 28 is formed to have a spiral cross-section while bending the first corner portion 41 contacting the horizontal piece portion 27a and the second corner portion 42 contacting the vertical piece portion 27b.

A curved portion 28 a having an arcuate cross section is formed on the side of the curled portion 28 farther from the inward flange portion 27 . When the container body 2 is closed with the lid 3 , the flat plate portion 35 of the lid 3 and the inner wall portion 36 a of the fitting convex portion abut against the curved portion 28 a of the curled portion 28 . The side of the curved portion 28a facing the inner wall portion 36a of the fitting projection 36 and the inner wall portion 26a of the fitting recess 26 in the top plate 23 are located on the same plane. Therefore, when the container body 2 is closed with the lid 3, the inner wall portion 36a of the fitting projection 36 and the inner wall portion 26a of the fitting recess 26 are in close contact with each other, and the flat plate portion 35 of the lid 3 and the fitting projection The inner wall portion 36 a of the portion 36 contacts the curved portion 28 a of the curl portion 28 . Therefore, when the container body 2 is closed with the lid 3, even if the container body 2 is tilted or turned upside down, the liquid in the container body 2 does not leak to the outside.

First to third embodiments will be described with reference to FIGS. 9 to 11. FIG. In addition, since the configurations and functions other than the inward flange portion 27 are the same as those described in the above embodiment, the same reference numerals are given and detailed description thereof will be omitted.

<First embodiment>
The inward flange portion 27 of the first embodiment includes a horizontal piece portion 27a that is bent obliquely downward in the radially decreasing direction from the upper end side of the inner wall portion 26a on the radially inner side of the fitting recess 26, and a horizontal piece portion 27a that extends upward from the horizontal piece portion 27a. It is composed of a vertical piece portion 27b that is bent vertically. Therefore, even if the liquid enters the second sealed space S2, the horizontal piece 27a extends obliquely downward in the diameter-reducing direction and the vertical piece 27b extends upward. It will accumulate in the space S2. Therefore, even if the liquid as the content is water-based, it is possible to more reliably prevent the liquid from entering the first closed space S1.

<Second embodiment>
The inward flange portion 27 of the second embodiment includes a lateral piece portion 27a formed by bending the upper end side of the inner wall portion 26a on the radially inner side of the fitting recess portion 26 in parallel with the diameter-reducing direction, and a lateral piece portion 27a extending vertically upward from the lateral piece portion 27a. It is composed of a vertical piece portion 27b that is formed by bending. Therefore, even if the liquid enters the second sealed space S2, the vertical piece 27b extends upward, so that the liquid stays in the second sealed space S2. Therefore, even if the liquid as the content is water-based, it is possible to prevent the liquid from entering the first sealed space S1, as in the first embodiment.

<Third embodiment>
The inward flange portion 27 of the third embodiment includes a horizontal piece portion 27a that is bent obliquely upward in the diameter-reducing direction from the upper end side of the inner wall portion 26a on the radially inner side of the fitting recess 26, and a horizontal piece portion 27a that extends upward from the horizontal piece portion 27a. It is composed of a vertical piece portion 27b that is bent vertically. Therefore, even if the liquid enters the second sealed space, the horizontal piece 27a extends obliquely upward in the diameter-reducing direction so that the liquid climbs the horizontal piece 27a in the diameter-reducing direction. no infiltration. Therefore, the liquid does not accumulate in the second sealed space S2, and even if the liquid contained therein is aqueous, the liquid does not reach the first sealed space S1 as in the first and second embodiments. can be suppressed more reliably.

As is clear from the above, according to the embodiment, the liquid as the content adhering to the back surface of the lid body 3 flows from the outside of the curled portion 28 into the curled portion 28 along the fitting convex portion 36 and the like. Even if it tries to infiltrate, the abutting portions between the corners 41 and 42 of the curled portion 28 and the inward flange portion 27 serve as barriers to block the infiltration of the liquid. Therefore, even if the liquid contained therein is water-based, it is possible to greatly suppress the risk of the liquid adhering to the tip surface 40 in the first closed space S1 and causing rust. Even if the liquid passes through the abutting portions (checkpoints) between the corners 41 and 42 of the curled portion 28 and the inward flange portion 27, the second sealed space S2 becomes a liquid pool space, and the first sealed space S2 becomes a first sealed space. It is possible to more reliably suppress the risk of liquid entering the space S1.

Furthermore, according to this embodiment, when the container body 2 is closed with the lid 3, the inner wall 36a of the fitting projection 36 and the inner wall 26a of the fitting recess 26 are in close contact with each other, and the flat plate of the lid 3 The portion 35 and the inner wall portion 36a of the fitting convex portion 36 abut against the curved portion 28a of the curl portion 28 . Therefore, when the container body 2 is closed with the lid 3, even if the container body 2 is tilted or turned upside down, the liquid in the container body 2 will not leak to the outside.

The configuration of each part in the present invention is not limited to the illustrated embodiment, and various modifications are possible without departing from the gist of the present invention. For example, as another embodiment, the curled portion 28 may have two or more (n≧2) corners, namely first to n-th corners, near the inward flange portion 27 . That is, the first to n-th corners may be in contact with the horizontal piece 27a or the vertical piece 27b of the inward flange 27, respectively. Further, the container body 2 may be in the shape of a rectangular tube or the like. The lid 3 may also be in the shape of a rectangular tube or the like. There is no particular limitation on the type of items to be stored in the container body 2 .

1 Metal Can 2 Container Body 3 Lid 20 Opening 21 Can Body 22 Bottom Plate 23 Top Plates 24, 25 Winding Part 26 Fitting Recess 26a Inner Wall 27 Flange 27a Horizontal Piece 27b Vertical Piece 28 Curl 28a Curvature Part 35 Flat plate part 36 Fitting convex part 36a Inner wall part 40 Tip surface 41 First corner part 42 Second corner part S1 First sealed space S2 Second sealed space

Claims (2)

A metal can comprising a container body constructed by winding a top plate having an opening and a bottom plate on both upper and lower ends of a cylindrical can body, and a lid that detachably closes the opening of the top plate. There is
An inward flange projecting radially inward is formed on the peripheral edge portion of the opening. A curled part is formed in the
said curled portion having at least one corner, said corner abutting an inwardly directed flange;
metal cans. A downward concave fitting recess surrounding the opening is formed on the outer peripheral side of the opening in the top plate, and the lid is detachably fitted into the fitting recess of the top plate. A downward convex fitting projection is formed,
When the container body is closed with the lid, a flat plate portion of the lid on the inner diameter side of the fitting convex portion and a curved portion of the curl portion formed on the side far from the inward flange portion are formed. abutting the
A metal can according to claim 1.

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