JP2020078492A - Portable thermos - Google Patents

Abstract

To provide a portable thermos which prevents deformation due to protrusion of an outer container to an inside and contact with an inner container, even when the portable thermos storing a liquid such as a beverage therein is fallen, and which can surely maintain heat insulation properties.SOLUTION: There is provided a portable thermos 1 in which a heat insulation space is provided between a substantially bottomed cylindrical inner container 2 formed of a metal, and a substantially bottomed cylindrical outer container 3 formed of a metal, a peripheral wall 34 of the outer container 3 comprises: an outer container taper part 321 whose diameter is gradually increased toward a bottom side of the container; and a curvature part 332 which is curved inward toward the bottom side of the container from a lower end of the outer container taper part 321. A bottom plate part 331 of the outer container is continuously provided to the lower end of the curvature part 332, a peripheral wall 24 of the inner container 2 is formed into a shape which substantially follows to the outer container taper part 321 and the curvature part 332, and a bottom plate part 231 of the inner container 2 is formed into a shape which substantially follows to the bottom plate part 331 of the outer container 3. A peripheral reinforcement rib 333 protruding inward, is formed on a position in the vicinity of the lower end of the curvature part 332 on the bottom plate part 331 of the outer container 3.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a double-layered portable thermos.

  Conventionally, as a portable thermos having a double structure, a substantially bottomed cylindrical metal inner container and a substantially bottomed cylindrical metal outer container are provided so as to be separated from each other, and between the inner container and the outer container. There is a portable thermos of Patent Document 1 in which the space is a vacuum heat insulating layer. In this portable thermos, in order to prevent the deformation of the outer container and maintain the space between the inner container and the outer container, the bottom plate portion provided as a step so as to rise inward of the outer container, Reinforcing ribs protruding inward are formed in a circumferential shape. The reinforcing rib is provided at an intermediate position between the center of the bottom plate portion of the outer container and the outer peripheral edge of the bottom plate portion of the outer container (FIG. 2, FIG. 4, FIG. 8, FIG. 9 of Patent Document 1). reference).

Japanese Patent No. 6039251

  By the way, in a portable thermos bottle composed of an inner container and an outer container, a taper portion on the peripheral wall of the outer container is formed so as to gradually expand in diameter toward the container bottom side, and from the lower end of this taper portion toward the container bottom side inward. If a curved portion is provided, the bottom plate portion of the outer container is provided so as to be continuous with the lower end of the curved portion, and further, the peripheral wall of the inner container is formed in a shape that substantially follows the tapered portion and the curved portion of the outer container, When a liquid such as a beverage is stored in the portable thermos, the liquid such as the beverage gathers at the bottom of the portable thermos, and the center of gravity of the portable thermos comes close to the bottom side. Then, when the user accidentally drops the portable thermos containing a liquid such as a drink, basically, the bottom plate of the outer container of the portable thermos or the curved portion near the bottom plate to the ground or It will fall to the floor.

  However, for a portable thermos bottle including an outer container having such a tapered portion and a curved portion and an inner container having a peripheral wall of a shape substantially following the outer container, a bottom plate portion of the outer container as disclosed in Patent Document 1 is used. When the strength is secured by the reinforcing ribs provided in the middle position between the center of the outer container and the outer peripheral edge of the bottom plate of the outer container, the outer container is deformed and protrudes inward, and the inner container comes into contact with the heat insulating property. Is more likely to be compromised. Therefore, in a portable thermos bottle including an outer container having a tapered portion and a curved portion and an inner container having a peripheral wall having a shape substantially similar to the outer container, a structure capable of more reliably preventing the outer container from being deformed is required. ..

  The present invention is proposed in view of the above problems, in a portable thermos bottle composed of an outer container having a tapered portion and a curved portion and an inner container in which a peripheral wall having a shape substantially following this is formed, a liquid such as a beverage is Provided is a portable thermos bottle, which prevents deformation of the outer container protruding inward and coming into contact with the inner container even when the contained thermos container is dropped, and can reliably maintain heat insulation. The purpose is to

The portable thermos bottle of the present invention is a portable thermos bottle in which a heat insulating space is provided between an inner container made of a metal having a substantially bottomed tubular shape and an outer container made of a metal having a substantially bottomed tubular shape, and the outer container. On the peripheral wall of the container, a tapered portion that gradually expands in diameter toward the container bottom side and a curved portion that curves inward from the lower end of the tapered portion toward the container bottom side are provided, and the bottom plate portion of the outer container is The bottom wall of the inner container is formed in a shape substantially following the tapered portion and the curved portion, and the bottom plate portion of the inner container is shaped substantially like the bottom plate portion of the outer container. And a circumferential reinforcing rib protruding inward is formed at a position near the lower end of the curved portion in the bottom plate portion of the outer container.
According to this, by providing a circumferential reinforcing rib that protrudes inward at a position near the lower end of the curved portion in the bottom plate portion of the outer container, the portable thermos container containing the liquid such as a beverage was dropped. In this case, it is possible to increase the strength around the lower end of the curved portion that is susceptible to a drop impact. Accordingly, it is possible to prevent the deformation of the outer container protruding inward and coming into contact with the inner container due to a drop impact, and it is possible to reliably maintain the heat insulating property. Further, since the circumferential reinforcing ribs are provided on the bottom plate portion of the outer container which is difficult for the user to visually recognize, it is possible to secure the aesthetics of the portable thermos bottle while enhancing the resistance to a drop impact. In addition, since it can be configured to basically drop from the container bottom side when storing a liquid such as a beverage, the strength required for the container mouth and the strength required for the lid fitted in the container mouth are allowed. The range can be expanded and the degree of freedom in designing the portable thermos and its lid can be increased.

In the portable thermos bottle of the present invention, the reinforcing rib is provided at a position adjacent to the lower end of the curved portion in the bottom plate portion of the outer container, and another inwardly projecting circumferential reinforcing rib is the reinforcing rib. It is concentric and is provided closer to the center of the bottom plate portion of the outer container than the reinforcing ribs.
According to this, by providing the reinforcing rib at a position adjacent to the lower end of the curved portion, it is possible to more reliably increase the strength around the lower end of the curved portion that is susceptible to a drop impact. Further, by providing both the reinforcing ribs and the other reinforcing ribs concentrically, it is possible to further increase the strength and further improve the resistance to a drop impact.

The portable thermos bottle of the present invention is, on the peripheral wall of the outer container, an arc-shaped curved portion that bends outward in a substantially arc shape from the upper end of the tapered portion toward the container mouth side, and from the upper end of the arc-shaped curved portion to the container mouth side. It is characterized in that another taper portion that gradually expands in diameter is provided.
According to this, by the shape of the taper portion and the arcuate curved portion different from the tapered portion on the peripheral wall of the outer container, it is possible to provide a portable thermos bottle having a substantially drum-shaped appearance and excellent appearance. Also, due to the curved shape composed of the curved part, the tapered part, the arc-shaped curved part and another tapered part, it is possible to exert high strength against the impact from the side of the container and It is possible to prevent deformation of the container protruding inward and coming into contact with the inner container, and it is possible to reliably maintain heat insulation.

  According to the portable thermos bottle of the present invention, a liquid such as a beverage is contained in a portable thermos bottle including an outer container having a tapered portion and a curved portion and an inner container having a peripheral wall having a shape substantially following the outer container. Even when the portable thermos is dropped, it is possible to prevent the outer container from being deformed by protruding inward and coming into contact with the inner container, and to reliably maintain the heat insulating property.

The front view which shows the portable thermos of embodiment by this invention. The longitudinal cross-sectional view which shows the portable thermos of embodiment. The expansion bottom view which shows the portable thermos of embodiment. The expanded sectional view which shows the bottom plate part vicinity of the portable thermos bottle of embodiment. The enlarged view of the AA part of FIG. The expanded sectional view which shows a part of mouth vicinity of the portable thermos of embodiment.

[Portable Thermos Bottle of Embodiment]
As shown in FIGS. 1 to 6, a portable thermos bottle 1 according to an embodiment of the present invention has a metal container 2 having a substantially bottomed cylindrical shape and a metal outer container 3 having a substantially bottomed cylindrical shape. A heat insulating space is provided between the inner container 2 and the outer container 3, and this heat insulating space serves as a heat insulating layer 4. The heat insulating layer 4 in the present 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 large. A vacuum heat insulating layer provided with a heat insulating material is provided by applying a metal foil such as copper or aluminum to the heat insulating layer of the air layer in the atmospheric pressure state or the outer surface of the inner container 2 or the inner surface of the outer container 3. Is also possible. Incidentally, 10 is a lid for closing the mouth of the portable thermos bottle 1. The lid 10 preferably has a tapered outer shape in which the peripheral wall gradually reduces in diameter toward the container bottom side in order to bring it closer to the substantially drum-shaped outer shape described later.

  The inner container 2 includes an opening-side mouth portion 21, a tubular body portion 22, and a bottom portion 23. At the tip of the mouth portion 21 of the inner container 2, a root is provided that is bent outward, and a diameter-expanded portion 211 that extends substantially straight upward is formed. It is provided along the entire circumference along the opening edge. An inner container taper portion 221 having a diameter gradually increasing toward the bottom portion 23 of the inner container 2 is provided below the body portion 22 of the inner container 2. The bottom portion 23 of the inner container 2 has a substantially dish shape, and a curved portion 232 that is convexly curved outward is provided around the bottom plate portion 231. The curved portion 232 of the bottom portion 23 constitutes the peripheral wall 24 of the inner container 2 together with the inner container tapered portion 221 of the body portion 22.

  The entire inner container 2 is formed of a thin material having substantially the same thickness. The inner container 2 of the illustrated example has a mouth portion 21 and a body portion 22 which are formed by deforming a single thin tubular material by pressing or the like. In addition to being formed, the bottom portion 23 is formed by deforming a single thin plate material by pressing or the like, and the lower end edge of the tubular body forming the mouth portion 21 and the body portion 22 has a substantially dish-shaped bottom portion 23. It is formed by being abutted against the upper edge of the curved portion 232 and joined by welding or the like. It should be noted that members forming the mouth portion 21, the body portion 22, the bottom portion 23 of the inner container 2 or the portions obtained by subdividing these predetermined portions are formed, and these are joined by welding or the like to form the inner container 2. Alternatively, from the viewpoint of reducing the manufacturing cost and improving the manufacturing efficiency, the entire 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 pressing or the like. May be.

  The outer container 3 includes an opening-side mouth portion 31, a tubular body portion 32, and a bottom portion 33. A folded-back portion 311 folded back inward is formed at the tip of the mouth 31 of the outer container 3, and the tip of the folded-back portion 311 is fitted inside the expanded diameter portion 211 of the inner container 2. The tip edge 312 of the folded-back portion 311 is substantially in contact with the base of the expanded diameter portion 211, and is welded circumferentially around the tip edge 312 by the welded portion 5 to join the outer container 3 and the inner container 2.

  The body 32 of the outer container 3 is provided with an outer container taper portion 321 whose diameter gradually increases toward the container bottom side, and the outer container taper portion 321 is generally outwardly outward from the upper end of the outer container taper portion 321. An arc-shaped curved portion 322 that bends in an arc shape and another outer-container taper portion 323 that gradually increases in diameter from the upper end of the arc-shaped curved portion 322 toward the container mouth side are provided. The bottom portion 33 of the outer container 3 is substantially dish-shaped, and a curved portion 332 that is convexly curved outward is provided around the bottom plate portion 331. In other words, the bottom plate portion 331 of the outer container 3 is provided at the lower end of the curved portion 332. It is set up in a row. The curved portion 332 of the bottom portion 33 constitutes the peripheral wall 34 of the outer container 3 together with the outer container tapered portion 321, the arcuate curved portion 322, and another outer container tapered portion 323.

  Then, the peripheral wall 24 formed by the inner container tapered portion 221 and the curved portion 232 of the inner container 2 is formed in a shape that substantially follows the outer container tapered portion 321 and the curved portion 332 that form the peripheral wall 34 of the outer container 3, The peripheral wall 24 and the peripheral wall 34 are provided separately. Further, the bottom plate portion 231 of the inner container 2 is formed in a shape substantially following the bottom plate portion 331 of the outer container 3, and the bottom plate portion 231 and the bottom plate portion 331 are provided separately.

  At the position near the lower end of the curved portion 332 of the bottom plate portion 331 of the outer container 3, a circumferential reinforcing rib 333 that is recessed so as to protrude inward is formed, and the reinforcing rib 333 in the present embodiment is the outer container. The bottom plate portion 331 of No. 3 is provided at a position adjacent to the lower end of the curved portion 332. A step bottom plate 335 is provided closer to the center of the reinforcing rib 333 of the bottom plate portion 331 via a step bending portion 334 that bends upward, and another stepped bottom plate 335 has another circumferential reinforcing rib that is recessed so as to project inward. 336 is formed. The other reinforcing rib 336 is concentric with the reinforcing rib 333 and is provided at a position closer to the center of the bottom plate portion 331 of the outer container 3 than the reinforcing rib 333 is.

  A suction hole 337 used when exhausting by vacuum suction from the space between the inner container 2 and the outer container 3 is provided substantially at the center of the bottom plate portion 331 in the center of a concave portion 338 which is recessed inward. A getter 339, which absorbs gas in a space between the inner container 2 and the outer container 3 after the suction hole 337 is sealed, is mounted on the bottom plate portion 331 between the suction hole 337 and another reinforcing rib 336 in 33. It is decorated to be placed. The bottom plate portion 231 of the inner container 2 is provided with a recess 233 that is recessed upward at approximately the center in order to secure a predetermined distance from the recess 338 protruding inward and the getter 339.

  The outer container 3 is entirely formed of a thin material having substantially the same thickness. In the illustrated outer container 3, the tubular body forming the mouth portion 31 and the body portion 32 is made of a single thin tubular material. An outer end of a hem portion 313 that extends outward from the lower end of the mouth portion 31 is formed by deforming by processing or the like, and the member forming the bottom portion 33 is formed by deforming a single thin plate material by pressing or the like. The edge and the upper edge of the body 32 are abutted and joined by welding or the like, and the lower edge of the body 32 and the upper edge of the curved portion 332 of the substantially dish-shaped bottom 33 are butted and joined by welding or the like. Has been done. The mouth portion 31 and the body portion 32 are formed by deforming a single thin-walled tubular material by pressing or the like, and the bottom portion 33 is formed by deforming a single thin-walled plate material by pressing or the like. The outer container 3 may be formed by abutting the lower end edge of the cylinder forming the body portion 32 and the upper end edge of the bottom portion 33 and joining them by welding or the like.

  In the portable thermos bottle 1 in which the inner container 2 and the outer container 3 are joined in a predetermined arrangement, another outer container taper portion 323 whose diameter gradually decreases toward the bottom portion 33 of the outer container 3 and a substantially arcuate convex inward shape. Due to the curved arcuate portion 322 and the outer container taper portion 321 that gradually expands in diameter toward the bottom of the outer container 3, the diameter gradually increases from the middle portion of the peripheral wall 34 of the outer container 3 in the upward and downward directions. It has a drum-like outer shape. Further, by constructing the peripheral wall 34 of the outer container 3 with a curved portion 332 having a large radius of curvature of preferably about 5 to 30 mm, more preferably about 10 to 20 mm, the lower part of the peripheral wall 34 of the portable thermos bottle 1 is formed. Can be rounded and expanded to give a soft and stable appearance.

  According to the portable thermos bottle 1 of the present embodiment, by providing the circumferential reinforcing rib 333 projecting inward at the position near the lower end of the curved portion 332 of the bottom plate portion 331 of the outer container 3, the liquid such as a beverage is stored. When the portable thermos bottle 1 that has been dropped is dropped, the strength around the lower end of the curved portion 332 that is susceptible to a drop impact can be increased. Accordingly, it is possible to prevent the deformation of the outer container 3 protruding inward and coming into contact with the inner container 2 due to a drop impact, and it is possible to reliably maintain the heat insulating property. Further, since the circumferential reinforcing rib 333 is provided on the bottom plate portion 331 of the outer container 3 which is hard to be visually recognized by the user, it is possible to secure the aesthetic appearance of the portable thermos bottle 1 while enhancing the resistance to a drop impact. In addition, since it can be basically configured to drop from the bottom side of the container when a liquid such as a beverage is stored, the strength required for the container mouth portion and the strength required for the lid 10 fitted to the container mouth portion can be reduced. The allowable range can be expanded, and the degree of freedom in designing the portable thermos bottle 1 and the lid 10 can be increased.

  Further, when the reinforcing rib 333 is provided at a position adjacent to the lower end of the curved portion 332, the strength around the lower end of the curved portion 332 that is susceptible to a drop impact can be more reliably increased. Further, by providing both the reinforcing rib 333 and another reinforcing rib 336 concentrically, it is possible to further increase the strength of the bottom plate portion 331 and the curved portion 332 and further improve the resistance to a drop impact.

  Further, the shape of the outer container taper portion 321 and the arcuate curved portion 322 on the peripheral wall 34 of the outer container 3 and the other outer container taper portion 323 makes it possible to provide the portable thermos bottle 1 having a substantially drum shape and excellent appearance. Further, due to the curved surface shape constituted by the curved portion 332, the outer container taper portion 321, the arcuate curved portion 322 and another outer container taper portion 323, it is possible to exert high strength against an impact from the side of the container. Further, it is possible to prevent the outer container 3 from being deformed by coming into contact with the inner container 1 due to the impact from the side, and the heat insulating property can be reliably maintained.

[Inclusive Range of Invention Disclosed in the Present Specification]
The invention disclosed in this specification includes, in addition to the inventions, embodiments, and modifications thereof listed as inventions, the partial contents thereof are changed to other contents disclosed in the specification in an applicable range. What is specified, or what is specified by adding other contents of the present disclosure to these contents, or these partial contents are deleted as a superordinate concept by deleting partial effects Includes those specified. The invention disclosed in the present specification includes the following modifications and added contents.

  For example, the portable thermos bottle of the present invention is not limited to the portable thermos bottle 1 of the embodiment, and is appropriate within the scope of the present invention, and the diameter gradually increases on the peripheral wall 34 of the outer container 3 toward the container bottom side. The outer container tapered portion 321 and the curved portion 332 that curves inward from the lower end toward the container bottom side are provided, and the bottom plate portion 331 of the outer container 3 is provided continuously to the lower end of the curved portion 332. The peripheral wall 24 of the container 2 is formed in a shape substantially following the outer container taper portion 321 and the curved portion 332, and the bottom plate portion 231 of the inner container 2 is formed in a shape substantially following the bottom plate portion 331 of the outer container 3. An appropriate portable thermos bottle in which a circumferential reinforcing rib 333 projecting inward is formed at a position near the lower end of the curved portion 331 in the bottom plate portion 331 of No. 3 is included.

  Further, the bottom plate portion 331 of the outer container 3 in the portable thermos bottle 1 of the above-described embodiment is provided with a step bending portion 334 and another reinforcing rib 336 formed on the step bottom plate 335, and the bottom portion 33 of the portable thermos bottle 1 is provided. Although the strength is further increased, the reinforcing rib 333 and another reinforcing rib 336 may be concentrically provided at the same height position of the bottom plate portion 331. In addition, when the circumferential reinforcing rib 333 is provided separately from the lower end of the curved portion 332, the separation distance is preferably more than 0 mm and 3 mm or less.

[Drop impact test of portable thermos]
Taking the portable thermos bottle 1 of the above embodiment as an example, the reinforcing ribs 333 of the portable thermos bottle 1 of the above embodiment are flat without forming the reinforcing ribs 333, and other configurations are the same as those of the portable thermos bottle 1. Using the above-mentioned portable thermos as a comparative example, both the portable thermos of the example and the portable thermos of the comparative example were closed with the same lid as the lid 10 in the above-described embodiment, and a drop impact test was performed. The portable thermos bottles of Examples and Comparative Examples were made of stainless steel, and were formed to have a bottom plate thickness of the inner container and a bottom plate thickness of the outer container of 0.3 mm, respectively. The radius of curvature was 6 mm, and the radius of curvature of the curved portion of the outer container was 15 mm. The reinforcing rib in the portable thermos bottle of the example was provided at a position adjacent to the lower end of the curved portion in the bottom plate portion of the outer container.

  The drop impact test of the portable thermos bottles of Examples and Comparative Examples was conducted in accordance with JIS S2006:2016 10.5.2.1. Each of the portable thermos bottles of Examples and Comparative Examples was filled with room temperature water to a height of 40 cm. From the above, it was dropped onto a hard wooden board having a thickness of 3 cm or more which was fixed horizontally in a vertical state, and water leakage and a change in appearance were confirmed. Furthermore, in accordance with JIS S2006:2016 10.4.1, the portable thermos bottles of the examples and comparative examples after being dropped were allowed to stand for 2 hours or more, then boiled water was added, and the temperature of the contents hot water after standing for 6 hours was measured. Then, the heat retention effect was confirmed.

  As a result of the drop impact test, water leakage did not occur in both the portable thermos of the example and the portable thermos of the comparative example, whereas the portable thermos of the example did not change in appearance, whereas the comparison In the portable thermos bottle of the example, an inwardly dented recess was formed at the bottom plate portion from the step bend portion to the curved portion of the outer container, and the recess contacted the inner container. Then, boiling water was added to the portable thermos of Example and the portable thermos of Comparative Example after the drop impact test, and it was confirmed that both initial temperatures were 92.1°C. When the temperature was confirmed, it was 71.1° C. in the portable thermos bottle of the example, whereas it was 65.1° C. in the portable thermos bottle of the comparative example.

  Furthermore, when the surface temperature of the outer container of the portable thermos of Example and the portable thermos of Comparative Example were confirmed after 30 minutes, the surface temperature of the outer container after 30 minutes was confirmed. The temperature of the peripheral wall was 33.1°C. On the other hand, the surface temperature of the peripheral wall of the outer container of the portable thermos bottle of the comparative example is 33.4° C., and the surface temperature of the bottom plate portion of the outer container is 62.8° C. It was confirmed that abnormal heat dissipation was occurring at the bottom plate of the container.

  INDUSTRIAL APPLICABILITY The present invention can be used for a portable thermos having a double structure.

DESCRIPTION OF SYMBOLS 1... Portable thermos bottle 2... Inner container 21... Mouth part 211... Expanded part 22... Body part 221... Inner container taper part 23... Bottom part 231... Bottom plate part 232... Curved part 233... Recessed part 24... Perimeter wall 3... Outer container 31 ... mouth part 311... folding part 312... tip edge 313... hem part 32... trunk part 321... outer container taper part 322... arcuate curved part 323... another outer container taper part 33... bottom part 331... bottom plate part 332... curved part 333 ... Reinforcing rib 334 ... Step bending portion 335 ... Step bottom plate 336 ... Another reinforcing rib 337 ... Suction hole 338 ... Recessed portion 339 ... Getter 34 ... Peripheral wall 4 ... Thermal insulation layer 5 ... Welded portion 10 ... Lid

Claims (3)

A portable thermos having a substantially bottomed cylindrical metal inner container and a substantially bottomed cylindrical metal outer container provided with a heat insulating space,
The peripheral wall of the outer container is provided with a tapered portion that gradually increases in diameter toward the container bottom side, and a curved portion that curves inward from the lower end of the tapered portion toward the container bottom side, and the bottom plate of the outer container. A portion is provided continuously to the lower end of the curved portion,
The peripheral wall of the inner container is formed in a shape that substantially follows the tapered portion and the curved portion, and the bottom plate portion of the inner container is formed in a shape that substantially follows the bottom plate portion of the outer container,
A portable thermos, characterized in that a circumferential reinforcing rib projecting inward is formed at a position near the lower end of the curved portion in the bottom plate portion of the outer container. The reinforcing rib is provided at a position adjacent to the lower end of the curved portion in the bottom plate portion of the outer container,
Another circumferentially extending reinforcing rib projecting inward is concentric with the reinforcing rib and is provided at a position closer to the center of the bottom plate portion of the outer container than the reinforcing rib. The portable thermos bottle described in 1. On the peripheral wall of the outer container, an arcuate curved portion that bends outward in a substantially arcuate shape from the upper end of the tapered portion toward the container mouth side, and another diameter gradually increasing from the upper end of the arcuate curved portion toward the container mouth side. The portable thermos according to claim 1 or 2, wherein a tapered portion is provided.

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