JP7179572B2 - Insulated double container and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an insulated double container such as a double structure portable thermos bottle, a desk thermos bottle, a mug cup, a soup cup, a lunch jar, etc., and a method for manufacturing the same.

Conventionally, the structure of the vacuum double container disclosed in Patent Document 1 is known as the structure of the heat insulating double container. In this vacuum double container, the mouth member of the outer container is formed with a folded portion that is folded back inward, and the mouth member of the inner container is formed with an enlarged diameter portion. Fit the folded part of the outer container to the inside of the enlarged diameter part of the inner container until it touches the root of the inner container, and laser the area around the point where the tip of the folded part of the outer container and the root of the enlarged diameter part of the inner container come into contact. It is fixed by welding.

Japanese Patent Application Laid-Open No. 2014-110

By the way, in the vacuum double container of Patent Document 1, the inner surface of the folded portion formed in the mouth member of the outer container and the inner surface of the inner container closer to the bottom than the expanded diameter portion are almost flush with each other. When the mouth is welded from the outside, there is a problem that it is difficult to recognize the point where the tip of the folded portion of the outer container and the base of the expanded diameter portion of the inner container, which serve as a mark for welding, abut against each other. Such obscurity of welding marks increases the possibility of defective welding, which is a factor in lowering the yield of products.

In view of the above problems, the present invention proposes a heat-insulated double container in which the welded portion between the inner container and the outer container is provided inside the container mouth. To provide an insulated double container which can be easily manufactured, can reduce welding defects, and can improve the yield of products, and a method for manufacturing the same.

In the heat insulating double container of the present invention, a heat insulating layer is provided between a substantially bottomed cylindrical inner container made of metal and a substantially bottomed cylindrical metal outer container, and the tip of the mouth of the outer container is provided. The inner container is arranged inside the folded portion with a folded portion that is folded back inward, and the tip of the opening of the inner container is engaged with the inner surface of the folded portion so as to contact the inner surface of the folded portion. is fixed by welding to the folded portion.
According to this, the tip edge of the mouth of the inner container is arranged inside the folded part, and the tip edge of the mouth of the inner container, which is the welding point when welding is performed from the outside of the container mouth, is positioned inside the folded part. Since it projects, the mark of welding can be made easy to understand. Therefore, defective welding can be reduced and the yield of products can be improved. In addition, since it is possible to eliminate a step that protrudes inward from the tip edge of the mouth of the inner container on the mouth side of the container, it is possible to ensure smooth outflow of the liquid such as beverage contained in the container.

In the heat insulating double container of the present invention, an inner container curved portion that is convex inwardly and curved inward is formed at the tip of the mouth portion of the inner container, and the folded portion of the outer container is formed at the tip of the folded portion of the container. A curved portion of the outer container that is convex inward and curved inward is formed, and the curved portion of the inner container is engaged with the curved portion of the outer container so as to cover the inner side of the curved portion of the outer container. characterized by
According to this, the curved portion of the inner container is engaged with the curved portion of the outer container so as to cover the curved portion of the outer container, thereby easily positioning and fixing the outer container, its constituent members, and the inner container at accurate positions. be able to.

In the heat insulating double container of the present invention, a diameter-reduced portion is formed at the tip of the mouth portion of the inner container, and the tip of the folded portion of the outer container is substantially in contact with the base of the diameter-reduced portion. It is characterized in that the folded portion and the diameter-reduced portion are fitted together.
According to this, by fitting the folded portion and the diameter-reduced portion in such a manner that the tip of the folded portion substantially abuts on the base of the diameter-reduced portion, the outer container, its constituent members, and the inner container can be easily positioned at accurate positions. can be positioned and fixed.

In the heat-insulating double container of the present invention, the body portion of the inner container is formed with an inner container taper portion having a portion larger in diameter than the inner diameter of the folded portion and gradually increasing in diameter toward the bottom portion of the inner container. The body of the outer container is formed with an outer container tapered portion that gradually expands in diameter toward the bottom of the outer container, and the inner container tapered portion and the outer container tapered portion are spaced apart from each other and substantially follow each other. It is characterized by being
According to this, even when there is an inner container having a portion larger in diameter than the inner diameter of the folded portion of the outer container and having an inner container tapered portion whose diameter gradually increases toward the bottom, at least the mouth portion of the outer container The inner container can be easily manufactured by inserting the inner container from the bottom side into the cylindrical body constituting the .

In the heat-insulating double container of the present invention, the tip of the mouth of the inner container is engaged with the inner surface of the folded portion of the outer container so as to be biased inward, and the biased portion is The shape of the tip of the opening of the inner container and the shape of the folded portion of the outer container substantially correspond to each other.
According to this, the tip of the mouth portion of the inner container is urged inwardly by the inner surface of the folded portion of the outer container, thereby improving the adhesion between the tip portion of the mouth portion of the inner container and the folded portion of the outer container. , the contact can be enhanced. Therefore, welding such as laser welding between the inner container and the outer container can be performed more reliably.

In the heat-insulating double container of the present invention, the folded portion has a shape in which a small rounded portion is formed at the tip, and an inclined portion that slopes inward downward from the inner end of the small rounded portion is formed. Characterized by
According to this, when the heat-insulating double container is used as a container for storing a liquid such as a portable thermos bottle, the liquid can be easily drained by the small rounded portion.

The method of manufacturing the heat-insulated double container of the present invention is a method of manufacturing the heat-insulated double container of the present invention, wherein the inner container is inserted from the bottom side into a cylinder constituting at least the mouth of the outer container. and placing the inner container curved portion of the inner container on the inner side of the outer container curved portion formed at the distal end of the folded portion of the cylindrical body. and a second step of welding the leading edge of the mouth of the inner container to the folded portion of the cylindrical body.
According to this, by inserting the inner container from the bottom side into the cylindrical body constituting at least the mouth portion of the outer container and engaging the curved portion of the inner container so as to cover the inner side of the curved portion of the outer container, The cylindrical body and the inner container can be easily positioned at accurate positions and welded securely.

The method of manufacturing the heat-insulated double container of the present invention is a method of manufacturing the heat-insulated double container of the present invention, wherein the inner container is inserted from the bottom side into a cylinder constituting at least the mouth of the outer container. a first step of fitting the folded portion and the diameter-reduced portion so that the tip of the folded portion of the cylindrical body substantially abuts the base of the diameter-reduced portion; to the folded portion of the tubular body.
According to this, the inner container is inserted from the bottom side into the cylindrical body that constitutes at least the mouth of the outer container, and the folded portion and the diameter-reduced portion are separated so that the tip of the folded portion substantially abuts the base of the diameter-reduced portion. By fitting them together, the cylindrical body and the inner container can be easily positioned at accurate positions and reliably welded.

The method for manufacturing the heat-insulated double container of the present invention is a method for manufacturing the heat-insulated double container of the present invention, wherein the inner container is inserted from the mouth portion side into a cylinder constituting at least the mouth portion of the outer container. Then, insert the tip of the mouth of the inner container so that the tip of the mouth of the inner container is urged inwardly by the inner surface of the folded part of the cylindrical body, so that the tip of the mouth of the inner container is attached to the folded part of the cylindrical body. It is characterized by comprising a first step of engaging with the inner surface and a second step of welding the leading edge of the mouth portion of the inner container to the folded portion of the cylindrical body.
According to this, by inserting the inner container from the mouth portion side into the cylindrical body constituting at least the mouth portion of the outer container, the degree of freedom in the shape of the cylindrical body when inserting the inner container and the freedom in the manufacturing process. For example, the inner container can be inserted into a cylindrical body without a bottom that constitutes the outer container, or a bottomed cylindrical body that has a bottom and has the shape of the outer container. , the engaging step can be performed.

According to the present invention, in a heat insulating double container in which the welded portion of the inner container and the outer container is provided inside the container mouth, the welding mark when welding from the outside of the container mouth can be made easy to understand, and welding defects can be reduced. , the product yield can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows the heat insulation double container of 1st Embodiment by this invention. FIG. 2 is a longitudinal sectional view showing the heat insulating double container of the first embodiment; FIG. 4 is an explanatory diagram for explaining a step of inserting an inner container into a cylinder constituting an outer container in a manufacturing process of the heat insulating double container according to the first embodiment; FIG. 5 is an explanatory diagram illustrating a process of engaging and welding the inner container to the cylinder constituting the outer container in the manufacturing process of the heat insulating double container according to the first embodiment. FIG. 5 is a partially enlarged explanatory view showing the periphery of the container mouth in FIG. 4; FIG. 11 is a partially enlarged explanatory view showing the periphery of the container opening in the heat insulating double container of the modified example of the first embodiment. The front view which shows the heat insulation double container of 2nd Embodiment by this invention. The longitudinal cross-sectional view which shows the heat insulation double container of 2nd Embodiment. FIG. 10 is a longitudinal explanatory view for explaining the manufacturing process of the heat insulating double container of the second embodiment. FIG. 10 is a partially enlarged explanatory view showing the periphery of the container mouth in FIG. 9; FIG. 4 is a partial enlarged view showing the periphery of the folded portion in the heat insulating double container of the first embodiment.

[Insulated double container of the first embodiment and its manufacturing method]
The heat insulating double container 1 of the first embodiment according to the present invention is used as a portable thermos flask or the like, and as shown in FIGS. It has a bottomed cylindrical outer container 3 made of metal, a space is provided between the inner container 2 and the outer container 3, and this space serves as a heat insulating layer 4. - 特許庁The heat insulating layer 4 in the first embodiment is a vacuum heat insulating layer in which the space between the inner container 2 and the outer container 3 is in a vacuum state or a reduced pressure state, but the space between the inner container 2 and the outer container 3 is A vacuum insulation layer provided with a heat insulation material is provided by applying a heat insulation layer of an air layer in the state of atmospheric pressure, or by applying metal foil such as copper or aluminum to the outer surface of the inner container 2 or the inner surface of the outer container 3. is also possible. A lid 10 closes the mouth of the heat insulating double container 1 .

The inner container 2 is composed of a mouth portion 21 on the opening side, a cylindrical body portion 22 and a bottom portion 23 . At the tip 211 of the mouth portion 21 of the inner container 2 , an inner container curved portion 212 is formed so as to be curved inward and convex toward the inside of the container. It is provided all around along the edge of the opening. The curved portion 212 of the inner container in the illustrated example has a shape that is convex to the inside of the container and bent in a substantially V shape, but the curved portion 212 of the inner container may be any shape that is convex to the inside of the container and bent inward. For example, it may have a shape that is convex toward the inside of the container and bent in a substantially arc shape. At the lower portion of the trunk portion 22 of the inner container 2, there is provided an inner container tapered portion 221 which has a portion larger in diameter than the inner diameter of the later-described folded portion 312 and which gradually expands in diameter toward the bottom portion 23 of the inner container 2. ing.

The entire inner container 2 is made of a thin material having substantially the same thickness. In addition, the bottom portion 23 is formed by deforming a single thin plate material by press working or the like, and the lower end edge of the cylinder constituting the mouth portion 21 and the body portion 22 is the substantially dish-shaped bottom portion 23 . It is formed by butting against the upper edge and joining by welding or the like. In addition, members constituting the mouth portion 21, body portion 22, and bottom portion 23 of the inner container 2 or subdivided portions thereof are formed, and these members are joined by welding or the like to form the inner container 2. Alternatively, from the viewpoint of reducing manufacturing costs and improving manufacturing efficiency, the mouth portion 21, body portion 22, and bottom portion 23 of the inner container 2 are formed by deforming a single thin plate material by press working or the like. may

The outer container 3 is composed of a mouth portion 31 on the opening side, a cylindrical body portion 32 and a bottom portion 33 . A tip portion 311 of the mouth portion 31 of the outer container 3 is formed with a folded portion 312 that is folded back inward. The portion 313 is formed to be curved, and the folded portion 312 and the outer container curved portion 313 are provided over the entire circumference along the edge of the opening of the outer container 3 . The curved portion 313 of the outer container in the illustrated example has a shape that protrudes toward the inside of the container and is curved in a substantially V-shape. Any shape that substantially corresponds to the portion 212 is suitable, and for example, a shape that is convex toward the inside of the container and curved in a substantially arc shape may be used. A first outer container tapered portion 321 whose diameter gradually decreases toward the bottom portion 33 of the outer container 3 is provided at the upper portion of the body portion 32 of the outer container 3 , and the lower portion of the body portion 32 of the outer container 3 , a second outer container tapered portion 322 whose diameter gradually increases toward the bottom portion 33 of the outer container 3 is provided.

Reinforcing ribs 331 and 332 recessed so as to protrude inward are circumferentially provided on the bottom 33 of the outer container 3, and the reinforcing ribs 331 and 332 are concentrically spaced apart. . In addition, the bottom portion 33 is provided with a suction hole 333 used when the space between the inner container 2 and the outer container 3 is evacuated by vacuum suction. A getter 334 is provided to absorb gas in the space between the inner container 2 and the outer container 3 after sealing.

The entire outer container 3 is made of a thin material having substantially the same thickness. In the illustrated outer container 3, the cylinders constituting the mouth portion 31 and the body portion 32 are each pressed from a single thin cylinder. A member that forms the bottom portion 33 is formed by deforming a single thin plate material by press working or the like. The edge and the upper edge of the body portion 32 are contacted and joined by welding or the like, and the lower edge of the body portion 32 and the upper edge of the substantially dish-shaped bottom portion 33 are butted and joined by welding or the like. The mouth portion 31 and the body portion 32 are formed by deforming a single thin tubular material by press working or the like, and the bottom portion 33 is formed by deforming a single thin plate material by press working or the like. The outer container 3 may be formed by joining the lower end edge of the cylindrical body constituting the trunk portion 32 and the upper end edge of the bottom portion 33 by welding or the like.

The tip portion 211 of the mouth portion 21 of the inner container 2 is engaged with the inner surface of the folded portion 312 of the outer container 3 so as to be in contact with the mouth portion 21 of the inner container 2 disposed inside the folded portion 312 . is welded and fixed to the folded portion 312 at the welding portion 5 (see FIGS. 1 to 5). In the first embodiment, the inner container curved portion 212 of the mouth portion 21 of the inner container 2 is engaged with the outer container curved portion 313 so as to cover the inner side of the outer container curved portion 313 of the outer container 3. In this state, the tip edge 213 of the mouth portion 21 of the inner container 2 is circumferentially welded to the folded portion 312 at the welding portion 5 . Further, the tip portion 211 of the mouth portion 21 of the inner container 2 is engaged with the inner surface of the folded portion 312 of the outer container 3 so as to be biased inward. The inner container curved portion 212 of the mouth portion 21 is engaged with the inner surface of the outer container curved portion 313 of the outer container 3 so as to be biased inward.

In the heat insulating double container 1 in which the inner container 2 and the outer container 3 are joined in a predetermined arrangement, the inner container taper portion 221 formed in the body portion 22 of the inner container 2 and the body portion 32 of the outer container 3 are formed. The second outer container tapered portion 322 is spaced apart and provided so as to substantially follow. The heat insulating double container 1 has a first outer container tapered portion 321 whose diameter gradually decreases toward the bottom portion 33 of the outer container 3 and a second outer container tapered portion 321 whose diameter gradually increases toward the bottom portion 33 of the outer container 3. Due to the tapered portion 322, the diameter of the intermediate portion of the body portion 32 is small as a whole, and the diameter gradually increases upward and downward from the intermediate portion of the body portion 32, thereby presenting a substantially drum-shaped outer shape.

When manufacturing the heat insulating double container 1 of the first embodiment, for example, the inner container 2 having a predetermined shape is formed, and the cylindrical body 34m constituting the mouth portion 31 and the body portion 32 of the outer container 3 having a predetermined shape is formed. The inner container 2 held by the jig 62 is inserted into the cylindrical body 34m held by the jig 61 from the bottom side as indicated by the thick arrow in FIG. The inner container curved portion 212 of the inner container 2 is put on the inner side of the outer container curved portion 313 , and the inner container curved portion 212 is engaged with the outer container curved portion 313 . After that, the tip edge 213 of the mouth portion 21 of the inner container 2 is welded to the folded portion 312 of the cylindrical body 34m by laser welding or the like to form and fix the welded portion 5 (see FIGS. 3 to 5). Furthermore, the upper edge of the bottom portion 33 formed in a predetermined shape and having the getter 334 attached thereto is brought into contact with the lower edge of the cylindrical body 34m and welded by laser welding or the like to obtain the heat insulating double container 1. In addition, if laser welding is used to form the welded portion 5, the outer container 3 can be welded and fixed to the inner container 2 precisely with low distortion. This is good because it is possible to prevent deformation, and the same applies to modified examples and a second embodiment, which will be described later.

In the manufacturing process of the heat insulating double container 1, the mouth portion 31 is formed instead of inserting the inner container 2 from the bottom side of the cylinder 34m using the cylinder 34m that constitutes the mouth portion 31 and the body portion 32. The inner container 2 is inserted from the bottom side of the cylindrical body, and the inner container curved portion 212 of the inner container 2 is covered inside the outer container curved portion 313 formed at the tip portion of the folded portion 312 of the cylindrical body. It is also possible to engage the curved portion 212 of the inner container with the curved portion 313 of the outer container in this way, and weld the tip edge 213 of the mouth portion 21 of the inner container 2 to the folded portion 312 . In this case, for example, after welding the inner container 2 to the cylinder constituting the mouth portion 31, the cylinder constituting the trunk portion 32 and the member constituting the bottom portion 33 are attached to the cylinder constituting the mouth portion 31. The heat-insulating double container 1 is obtained by sequentially welding or by welding the members constituting the body portion 32 and the bottom portion 33 .

According to the first embodiment, the tip edge 213 of the mouth portion 21 of the inner container 2 is arranged inside the folded portion 312, and the mouth portion 21 of the inner container 2 serves as a welding point when welding from the outside of the container mouth. Since the tip edge 213 of the protrudes inwardly from the folded portion 312, the welding mark can be easily recognized. Therefore, defective welding can be reduced and the yield of products can be improved. In addition, since it is possible to eliminate a step protruding inwardly from the tip edge 213 of the mouth portion 21 of the inner container 2 on the container mouth side, it is possible to smoothly flow out the liquid such as a beverage contained in the heat insulating double container 1. You can also try to secure it. Furthermore, when the heat-insulating double container 1 is a container such as a portable thermos bottle, the welded portion 5 is at or near the tip of the folded portion 312 and close to the mouth of the container. Since it is provided inwardly, it is possible to prevent the user's mouth from coming into contact with the welded portion 5, thereby providing the user with a good drinking comfort.

In addition, the inner container 2 is inserted from the bottom side into the tubular body constituting at least the mouth portion 31 of the outer container 3, and the inner container curved portion 212 is engaged with the inner side of the outer container curved portion 313 so as to be covered. As a result, the outer container 3, its constituent members, and the inner container 2 can be easily positioned at accurate positions and securely welded and fixed. Further, the distal end portion 211 of the mouth portion 21 of the inner container 2 is engaged with the inner surface of the folded portion 312 of the outer container 3 so as to be biased inward, and the mouth portion of the inner container 2 at the biased portion 21 and the folded portion 312 of the outer container 3 substantially correspond to each other. It is possible to improve reliability of welding such as laser welding between the inner container 2 and the outer container 3. In other words, the heat-insulating double container 1 is manufactured by utilizing the springback of the outer container 3, and the adhesion and contact between the tip portion 211 of the mouth portion 21 of the inner container 2 and the folded portion 312 of the outer container 3 are improved. It is possible to obtain the heat-insulating double container 1 which is high and has high welding reliability such as laser welding of the inner container 2 and the outer container 3 .

In addition, due to the manufacturing process in which the inner container 2 is inserted from the bottom side into the cylindrical body constituting at least the mouth portion 31 of the outer container 3, the inner container 2 has a portion with a larger diameter than the inner diameter of the folded portion 312 of the outer container 3 and the bottom portion. Even the heat insulating double container 1 having the inner container 2 having the inner container tapered portion 221 whose diameter gradually expands toward 23 can be easily manufactured.

[Insulated Double Container of Modified Example of First Embodiment and Manufacturing Method Thereof]
The heat-insulated double container 1 of the first embodiment can be modified as shown in FIG. In the heat-insulated double container 1 of this modification, the tip portion 211p of the mouth portion 21p of the inner container 2 is bent inward and provided with a root, and a diameter-reduced portion 214p extending substantially straight upward is formed. The diameter-reduced portion 214p is provided over the entire circumference along the edge of the opening of the inner container 2. As shown in FIG. The inner container 2 in the heat insulating double container 1 of the modified example is also formed of a thin material having substantially the same thickness as a whole. In addition, the bottom portion 23 is formed by deforming a single thin plate material by press work or the like, and the lower end edge of the cylinder constituting the mouth portion 21p and the body portion 22 is the upper end edge of the bottom portion 23. are butted against each other and joined by welding or the like.

In the outer container 3 of the heat-insulated double container 1 of the modified example, the tip 311p of the opening 31p is also formed with a folded portion 312p that is folded inward. The hanging portion 315p extends substantially straight, and the folded portion 312p and the hanging portion 315p are provided along the opening edge of the outer container 3 over the entire circumference. The outer container 3 in the heat-insulating double container 1 of the modified example is also formed of a thin material having substantially the same thickness as a whole. is deformed by press working or the like, and the member constituting the bottom portion 33 is formed by deforming a single thin plate material by press working or the like. The outer edge and the upper edge of the trunk portion 32 are brought into contact and joined by welding or the like, and the lower edge of the trunk portion 32 and the upper edge of the bottom portion 33 are butted and joined together by welding or the like.

The tip portion 211p of the mouth portion 21p of the inner container 2 is engaged with the inner surface of the folded portion 312p of the outer container 3 so as to be in contact with the mouth portion 21p of the inner container 2 disposed inside the folded portion 312p. is welded and fixed to the folded portion 312p by the welding portion 5. As shown in FIG. In the heat insulating double container 1 of the modified example of the first embodiment, the folded portion 312p and the reduced diameter portion 214p are fitted together such that the tip 316p of the folded portion 312p of the outer container 3 is substantially in contact with the base of the reduced diameter portion 214p. In this state, the tip edge 213p of the mouth portion 21p of the inner container 2 is welded to the folded portion 312p at the welding portion 5. As shown in FIG.

In the fitting structure of the folded portion 312p and the reduced diameter portion 214p, the inner diameter of the hanging portion 315p of the folded portion 312p and the outer diameter of the reduced diameter portion 214p, which extend substantially straight and have substantially corresponding shapes, are fitted together. However, the inner diameter of the drooping portion 315p of the folded portion 312p is slightly smaller than the outer diameter of the reduced diameter portion 214p, and the drooping portion 315p urges the reduced diameter portion 214p inward. In other words, a structure in which the tip end portion 211p of the mouth portion 21p of the inner container 2 is engaged with the inner surface of the folded portion 312p of the outer container 3 so as to be biased inwardly is preferable.

When manufacturing the heat insulating double container 1 of the modified example of the first embodiment, for example, the inner container 2 having a predetermined shape is formed, and the cylinder constituting the mouth portion 31p and the body portion 32 of the outer container 3 having a predetermined shape is formed. The inner container 2 is inserted into this cylindrical body from the bottom side, and the folded portion 312p and the reduced diameter portion 214p are arranged such that the distal end 316p of the folded portion 312p of the cylindrical body substantially abuts the base of the reduced diameter portion 214p. mating. After that, the tip edge 213p of the mouth portion 21p of the inner container 2 is welded to the folded portion 312p of the cylindrical body by laser welding or the like to form the welded portion 5 and fixed. Furthermore, the upper edge of the bottom portion 33 formed in a predetermined shape and having the getter 334 attached thereto is butted against the lower edge of the cylindrical body and welded by laser welding or the like to obtain the heat insulating double container 1 .

In the manufacturing process of the heat-insulating double container 1 of this modified example, instead of inserting the inner container 2 from the bottom side of the cylindrical body using the cylindrical body constituting the mouth part 31p and the body part 32, the mouth part 31p is It is also possible to manufacture the heat-insulating double container 1 by inserting the inner container 2 from the bottom side of the constituting cylindrical body. Other configurations of the heat-insulated double container 1 and the manufacturing method thereof of the modified example are the same as those of the heat-insulated double container 1 of the first embodiment and the method of manufacturing the same. It is possible to use something similar to the double container 1 and its manufacturing method.

According to the heat insulating double container 1 of the modified example of the first embodiment, the corresponding effect can be obtained from the structure corresponding to the heat insulating double container 1 of the first embodiment. In addition, by fitting the folded portion 312p and the reduced diameter portion 214p so that the tip 316p of the folded portion 312p is substantially in contact with the base of the reduced diameter portion 214p, the outer container 3 and its constituent members and the inner container 2 can be accurately connected. The cylinder body and the inner container 2 can be easily positioned at accurate positions and reliably welded.

[Insulated double container of the second embodiment and its manufacturing method]
The heat-insulated double container 1a of the second embodiment according to the present invention is also used as a portable thermos flask or the like, and as shown in FIGS. It has a bottomed cylindrical outer container 3a made of metal, a space is provided between the inner container 2a and the outer container 3a, and this space serves as a heat insulating layer 4a. The heat insulating layer 4a in the second embodiment can be configured similarly to the heat insulating layer 4 in the first embodiment.

The inner container 2a is composed of a mouth portion 21a on the opening side, a cylindrical body portion 22a, and a bottom portion 23a. The tip portion 211a of the mouth portion 21a of the inner container 2a is formed substantially straight toward the mouth of the container, and the tip portion 211a of this substantially straight shape extends along the entire circumference along the opening edge of the inner container 2a. are set across. The body portion 22a of the inner container 2a is substantially cylindrical, and the bottom portion 23a is substantially dish-shaped.

The entire inner container 2a is made of a thin material having substantially the same thickness. In the illustrated inner container 2a, the mouth portion 21a, the body portion 22a, and the bottom portion 23a are made of a single thin plate material and deformed by press working or the like. It is formed by In addition, members are formed to form the mouth portion 21a, the body portion 22a, and the bottom portion 23a of the inner container 2a, or subdivided portions of these predetermined portions, and these are joined by welding or the like to form the inner container 2a. Alternatively, the mouth portion 21a, the body portion 22a, and the bottom portion 23a are each formed of a single thin plate material and joined by welding or the like to form the inner container 2a, or the mouth portion 21a, the body portion 22a, and the bottom portion 23a. may be formed of a single thin plate material and joined by welding or the like to form the inner container 2a.

The outer container 3a is composed of a mouth portion 31a on the opening side, a cylindrical body portion 32a, and a bottom portion 33a. A tip portion 311a of the mouth portion 31a of the outer container 3a is formed with a folded portion 312a that is folded back inward. A portion 317a is provided, and the biasing portion 317a is provided along the entire circumference along the edge of the opening of the outer container 3a. The body portion 32a of the outer container 3a is substantially cylindrical, and the bottom portion 33a is substantially dish-shaped.

The bottom 33a of the outer container 3a is circumferentially provided with reinforcing ribs 335a recessed so as to protrude inward. Further, the bottom portion 33a is provided with a suction hole 333a used when the space between the inner container 2a and the outer container 3a is evacuated by vacuum suction. A getter 334a is provided to absorb gas in the space between the inner container 2a and the outer container 3a after sealing.

The entire outer container 3a is made of a thin material having substantially the same thickness. In the outer container 3a shown in the figure, the cylindrical body forming the mouth portion 31a and the body portion 32a is formed by pressing a single thin cylindrical material. etc., and the member forming the bottom portion 33a is formed by deforming a single thin plate material by press working or the like, and the lower edge of the body portion 32a and the upper edge of the bottom portion 33a are butted and welded. etc. The mouth portion 31a and the body portion 32a are each formed by deforming a single thin cylindrical member by press working or the like, and the bottom portion 33a is formed by deforming a single thin plate member by press working or the like. The upper edges of the mouth portion 31a, the body portion 32a, and the bottom portion 33a may be joined by welding or the like to form the outer container 3a, or from the viewpoint of reducing manufacturing costs and improving manufacturing efficiency, the mouth portion 31a The body portion 32a and the bottom portion 33a may be formed by deforming a single thin plate material by press working or the like to form the outer container 3a.

The tip portion 211a of the mouth portion 21a of the inner container 2a is engaged with the inner surface of the folded portion 312a of the outer container 3a so as to be in contact with the mouth portion 21a of the inner container 2a disposed inside the folded portion 312a. is welded and fixed to the folded portion 312a at the welding portion 5a (see FIGS. 7 to 10). In the second embodiment, the tip end portion 211a of the mouth portion 21a of the inner container 2a is engaged with the inner surface of the folded portion 312a of the outer container 3a, in other words, by the biasing portion 317a so as to be biased inward. , the front end portion 211a of the mouth portion 21a of the inner container 2a, which is biased, and the shape of the folded portion 312a of the outer container 3a, in other words, the shape of the biasing portion 317a substantially correspond to each other. there is

When manufacturing the heat insulating double container 1a of the second embodiment, for example, the inner container 2a having a predetermined shape is formed, and the outer container 3a having a predetermined shape, which is a cylindrical body with a bottom, is formed, and the bottom portion 33a is formed. The getter 34a is provided, and the inner container 2a held by the jig 64 for sucking and transferring the bottom 23a with a suction cup is inserted into the outer container 3a held by the jig 63 from the mouth side of the outer container 3a, The distal end portion 211a of the mouth portion 21a of the inner container 2a is pushed inwardly by the inner surface of the folded portion 312a, in other words, the biasing portion 317a, so that the distal end portion 211a of the mouth portion 21a of the inner container 2a is pushed outward. It engages with the inner surface of the folded portion 312a of the container 3a. After that, the tip edge 213a of the mouth portion 21a of the inner container 2a is welded to the folded portion 312a of the outer container 3a by laser welding or the like to form the welded portion 5a and fixed (see FIGS. 9 and 10).

In the manufacturing process of the heat-insulating double container 1a, the inner container 2a is inserted from the mouth portion side of the cylinder constituting the mouth portion 31a and the body portion 32a of the outer container 3a, and the tip portion 211a of the mouth portion 21a of the inner container 2a is inserted. It is also possible to manufacture by engaging the mouth portion 31a and the inner surface of the folded portion 312a of the cylinder constituting the body portion 32a so as to be biased inward. In this case, after or before welding the inner container 2a to the cylinder constituting the mouth portion 31a and the body portion 32a, the members constituting the bottom portion 33a are welded to obtain the heat insulating double container 1a.

Further, in the manufacturing process of the heat insulating double container 1a, the inner container 2a is inserted from the mouth portion side of the cylinder constituting the mouth portion 31a, and the tip portion 211a of the mouth portion 21a of the inner container 2a constitutes the mouth portion 31a. It is also possible to manufacture by engaging with the inner surface of the folded portion 312a of the cylindrical body so as to be biased inward. In this case, for example, after or before welding the inner container 2a to the cylinder constituting the mouth portion 31a, the cylinder constituting the body portion 32a and the bottom portion 33a are attached to the cylinder constituting the mouth portion 31a. , or by welding the members constituting the body portion 32a and the bottom portion 33a, to obtain the heat insulating double container 1a.

According to the second embodiment, a corresponding effect can be obtained from a configuration corresponding to the first embodiment. Further, the biasing portion 317a can enhance the adhesion and contact between the tip portion 211a of the mouth portion 21a of the inner container 2a and the folded portion 312a of the outer container 3a. Therefore, welding such as laser welding between the inner container 2a and the outer container 3a can be performed more reliably. In other words, the springback of the outer container 3a is used to manufacture the heat insulating double container 1a, and the adhesion and contact between the tip end portion 211a of the mouth portion 21a of the inner container 2a and the folded portion 312a of the outer container 3a are improved. It is possible to obtain a heat insulating double container 1a which is high and has high certainty of welding such as laser welding between the inner container 2a and the outer container 3a. In addition, due to the manufacturing process of inserting the inner container 2a from the mouth portion side into the cylindrical body constituting at least the mouth portion 31a of the outer container 3a, the degree of freedom of the shape of the cylindrical body when inserting the inner container 2a, the manufacturing process degree of freedom can be increased.

[Scope of invention disclosed in this specification]
The invention disclosed in this specification includes, in addition to each invention, each embodiment, and modifications thereof listed as inventions, to the extent applicable, these partial contents are changed to other contents disclosed in this specification. or those specified by adding other contents disclosed in this specification to these contents, or deleting these partial contents to the extent that partial effects can be obtained and generalizing them includes those specified in the The invention disclosed in this specification also includes the following modifications and additional contents.

For example, the folded portion 312 of the heat insulating double container 1 of the first embodiment has a small rounded portion 3121 formed at the tip, and an inclined portion 3122 that slopes downward and inward from the inner end of the small rounded portion 3121 is formed. The folded portion 312p of the modified example of the first embodiment and the folded portion 312a of the heat insulating double container 1a of the second embodiment have the same structure, and the heat insulating double containers 1 and 1a can be used as a portable thermos flask or the like. When used as a container for containing a liquid, the small rounded portion 3121 has a structure in which the liquid can be drained easily. included. The optimum outer diameter of the small rounded portion is 0.9 mm to 1.2 mm.

For example, the shape and configuration of the heat-insulating double container of the present invention are not limited to the first and second embodiments, and are appropriate within the scope of the present invention. The present invention includes an appropriate heat-insulated double container in which the leading edge of the mouth of the inner container disposed inside the folded portion is welded and fixed to the folded portion. . In addition, the present invention can be applied to appropriate heat-insulated double containers such as double-structured portable thermos flasks, desktop thermos flasks, mug cups, soup cups, and lunch jars.

INDUSTRIAL APPLICABILITY The present invention can be used, for example, for heat-insulating double containers such as double-structured portable thermos flasks, desktop thermos flasks, mug cups, soup cups, and lunch jars.

DESCRIPTION OF SYMBOLS 1... Thermal insulation double container 2... Inner container 21... Mouth part 211... Tip part 212... Inner container curved part 213... Tip edge 21p... Mouth part 211p... Tip part 213p... Tip edge 214p... Diameter reduction part 22... Body part 221 Inner container tapered portion 23 Bottom portion 3 Outer container 31 Mouth portion 311 Tip portion 312 Folded portion 3121 Small rounded portion 3122 Inclined portion 313 Outer container curved portion 314 Bottom portion 31p Mouth portion 311p Tip part 312p... Folded part 314p... Bottom part 315p... Drooping part 316p... Tip 32... Body part 321... First outer container taper part 322... Second outer container taper part 33... Bottom part 331, 332... Reinforcement rib 333... Suction hole 334 Getter 34m Cylindrical body 4 Thermal insulation layer 5 Welded portion 10 Lid 1a Thermal insulation double container 2a Inner container 21a Mouth 211a Tip 213a Tip edge 22a Trunk 23a Bottom 3a Outer container 31a Mouth portion 311a Tip portion 312a Folded portion 317a Biasing portion 32a Body portion 33a Bottom portion 333a Suction hole 334a Getter 335a Reinforcement rib 4a Thermal insulation layer 5a Welding portion 61, 62, 63, 64 ... Jig

Claims (5)

A heat insulating layer is provided between a substantially bottomed cylindrical inner container made of metal and a substantially bottomed cylindrical metal outer container,
A folded portion folded inward is formed at the tip of the mouth portion of the outer container,
An inner container curved portion is formed at the tip of the mouth portion of the inner container so as to be convex toward the inside of the container and curved inward,
An outer container curved portion that protrudes toward the inside of the container and curves inward is formed at the tip of the folded portion of the outer container,
The curved portion of the inner container is engaged with the curved portion of the outer container so as to cover the inner side of the curved portion of the outer container, and the tip of the mouth portion of the inner container is brought into contact with the inner surface of the folded portion. is engaged in
A heat-insulating double container, wherein a leading end edge of a mouth portion of the inner container disposed inside the folded portion is welded and fixed to the folded portion. An inner container taper portion having a portion larger in diameter than the inner diameter of the folded portion and gradually increasing in diameter toward the bottom portion of the inner container is formed in the body portion of the inner container,
An outer container taper portion is formed in the body portion of the outer container, the outer container taper portion gradually increasing in diameter toward the bottom portion of the outer container,
2. The insulated double container according to claim 1 , wherein said tapered portion of said inner container and said tapered portion of said outer container are spaced apart from each other so as to substantially follow each other. the tip of the mouth portion of the inner container is engaged with the inner surface of the folded portion of the outer container so as to be biased inward;
3. The insulated double container according to claim 1, wherein the shape of the tip of the mouth portion of the inner container and the shape of the folded portion of the outer container at the biased portion substantially correspond to each other. The folded portion has a shape in which a small rounded portion is formed at the tip, and an inclined portion that slopes downward and inward from the inner end of the small rounded portion is formed. An insulated double container according to any one of the above. A method of manufacturing the insulated double container of claim 1 , comprising:
The inner container is inserted from the bottom side into the cylindrical body constituting at least the mouth of the outer container, and the inner container is inserted inside the curved portion of the outer container formed at the tip of the folded portion of the cylindrical body. a first step of engaging the curved portion of the inner container with the curved portion of the outer container so as to cover the curved portion of the inner container;
A method for manufacturing a heat-insulated double container, comprising a second step of welding a leading edge of the mouth portion of the inner container to the folded portion of the tubular body.

Images