KR102505488B1 - Double layer type cooking container - Google Patents

Abstract

The present invention relates to a double cooking vessel. The height of an air gap (A) is irreversibly maintained by interposing a sandwich wedge ring (90) between an inner container (70) and an outer container (80), and the sandwich wedge ring (90). The center hole wedge (81b) wraps around the inner periphery and is embedded in the inner container (70), ensuring airtightness through a gap-free structure. In particular, an upward wedge (90a) and a downward wedge (90b) are simultaneously driven upward and downward into the inner container (70) and the outer container (80), thereby firmly fixing the sandwich wedge ring (90). A concealed structure of the sandwich wedge ring (90) completely eliminates exposure to the outside, ensuring neatness and longevity. Furthermore, not only does the present invention have a simple structure, but a simple process of pressing the inner container (70) and the outer container (80) together with the sandwich wedge ring (90) in between completes the assembly, thereby improving assemblyability and productivity.

Description

Double cooking container {DOUBLE LAYER TYPE COOKING CONTAINER}

The present invention relates to a dual cooking container, and more particularly, sandwich wedge rings are interposed between the inner container and the outer container to irreversibly maintain the height of the air gap while covering the inner periphery of the sandwich wedge ring as a center hole wedge. In addition to guaranteeing airtightness by a structure without gaps, especially, the upward and downward wedges are simultaneously driven upwards and downwards into the inner and outer containers, ensuring the firm fixation of the sandwich wedge ring as well as the durability of the sandwich wedge ring. It thoroughly eliminates exposure to the outside due to the concealed structure to ensure neatness and longevity, and furthermore, simple structure as well as a simple process of pressing the inner and outer containers at once with a sandwich wedge ring in between, assembling each other It relates to a double cooking container that has been completed to improve assembly and productivity.

In general, cooking vessels are made of a single layer of material (aluminum casting or aluminum plate). In this case, the heat is concentrated on the lower surface, which not only causes a difference in the degree of cooking food according to the temperature difference with the side surface, but also improves the heat retention after cooking. causes problems that cannot be

In order to solve this phenomenon, a double cooking container has recently been developed.

1A is an exploded perspective view showing a double cooking container according to Prior Art Document 1 (Korean Patent Registration No. 2308622), and FIG. 1B is a longitudinal sectional view showing a double cooking container according to Prior Art Document 1.

As shown in FIGS. 1A and 1B , the double cooking vessel according to Prior Art Document 1 includes an inner container 20 configured in a container shape with an inner side wall 24 connected to an inner bottom 22 and an outer bottom 32 The outer side wall 34 is configured in the shape of a connected container and disposed on the outer surface of the inner container 20, and the outer container 30 having a cap insert hole 32CH on the outer bottom 32, and the outer container 30 It is inserted into the cap insert hole (32CH) formed in the outer bottom 32 of and includes a bottom cap 40 disposed on the outer surface of the inner bottom 22 of the information container 20.

At this time, the bottom cap 40 includes an embedded insert piece 47 embedded in the inner bottom 22 to fix the bottom cap 40 to the inner bottom 22 of the container 20, and the bottom ceiling A bottom side wall 44 extending downward from the circumference of the wall 42 and a bottom flange portion 46 extending radially outward from the circumference of the bottom side wall 44, The lower end of the embedded insert piece 47 is connected so that the embedded insert piece 47 protrudes upward from the upper surface of the bottom ceiling wall 42, and the embedded insert piece 47 is inside the inner bottom 22 of the container 20 It is embedded in the structure to support the upper surface of the bottom ceiling wall 42 to be in close contact with the outer surface of the inner floor 22.

However, when the double cooking vessel according to Prior Art Document 1 is used for a long period of time, the bottom flange portion 46 of the bottom cap 40 bumps into or gets caught on a trivet such as a gas range, and the outer bottom 32 of the outer container 30 ) It is not only easily separated from (tap water permeation), but also has a problem that the outer bottom 32 is not in contact with the flat dining table in a horizontal state by the bottom flange portion 46 and causes a lifting phenomenon.

Figure 2a is an exploded perspective view showing a double cooking vessel according to Prior Art Document 2 (Korean Patent Registration No. 2308627), Figure 2b is a longitudinal cross-sectional view showing a double cooking vessel according to Prior Art Document 2.

The double cooking vessel according to Prior Art Document 2 has an inner container 20 configured in a container shape with an inner side wall 24 connected to an inner bottom 22 and a container shape with an outer side wall 34 connected to an outer bottom 32. It is configured and is configured to have a thinner thickness than the inner container 20 and is connected to the outer container 30 disposed on the outer surface of the inner container 20 and the outer bottom 32 of the outer container 30, so that the inner container ( 20) includes a bottom cap 40 disposed on the outer surface of the inner bottom 22.

At this time, the bottom cap 40 is directly formed by being embedded in the inner bottom 22, and the embedded insert piece 47 fixing the bottom cap 40 to the inner bottom 22 of the container 20 and a bottom sidewall 44 extending downward from the circumference of the bottom ceiling wall 42, the bottom sidewall 44 being connected to the outer floor 32, and an insert piece embedded in the bottom ceiling wall 42. The lower end of 47 is connected so that the embedded insert piece 47 protrudes upward from the upper surface of the bottom ceiling wall 42, and the embedded insert piece 47 is embedded in the inner bottom 22 of the container 20 The upper surface of the bottom ceiling wall 42 is configured to closely support the outer surface of the inner floor 22 .

However, in the double cooking container according to Prior Art Document 2, the outer container 30 should be provided thinner than the inner container 20 in order to form the insert piece 47 of the bottom cap 40 in the outer container 30. , In this case, the outer container 30 cannot be manufactured as an aluminum plate or aluminum casting, and there is a limit in that it must be made of stainless steel. In particular, the heat sensor of the gas range directly fits the bottom cap 40 of the outer container 30 When the heat is applied to the outer container 30 because it is bound to touch, the bottom cap 40 is equally heated by thermal conduction, so that the heat sensor detects the actual inner container 20 much more sensitively than the gas range A problem that causes a malfunction for on/off is generated.

Figure 3a is an exploded cross-sectional view showing a double cooking container in which confidentiality is maintained according to Prior Art Document 3 (Korean Patent Registration No. 2057486), Figure 3b is an assembly showing a double cooking container in which confidentiality is maintained according to Prior Art Document 3 3C is an enlarged view of a coupling portion showing a double cooking vessel in which confidentiality is maintained according to Prior Art Document 3.

As shown in FIGS. 3A to 3C, the airtight double cooking vessel according to Prior Art Document 3 is composed of a bottom 110 and a bowl head 120, and protrudes downward concentrically on the bottom surface of the bottom 110. An inner container 100 having a coupling portion 160 made of a pair of insert protrusions 162 and having an assembly portion 150 on the lower surface of the flange 140 provided on the top of the bowl head 120; It consists of a bottom part 210 and a side wall part 220, and a fixing piece 212 protrudes upward from a circular space in the center of the bottom part 210 and is inserted into the coupling part 160, and the side wall part (220) includes an outer container 200 with a fixing stone frame 222 at the top and inserted into the assembly part 150, and a circular space is provided inside the fixing piece 212 so that the sensor of the gas lens is located, , press the insert protruding portion 162 and the assembly portion 150 to maintain airtightness.

However, in the double cooking container in which confidentiality is maintained according to Prior Art Document 3, the fixing piece 212 of the outer container 200 is fixed only by bending the insert protrusion 162 of the inner container 100, and the fixing force is very weak (tap water penetration).

Figure 4a is an exploded perspective view showing a double cooking container combining gas cooking and induction according to Prior Art Document 4 (Korean Laid-Open Patent Publication No. 2021-0079814), Figure 4b is an exploded perspective view showing a gas cooking and induction combination according to Prior Art Document 4 It is a longitudinal cross-sectional view showing the double cooking container, and FIG. 4B is an enlarged view showing the main part of the double cooking container combining gas cooking and induction according to Prior Art Document 4.

The double cooking vessel combining gas cooking and induction according to Prior Art Document 4 includes an inner container 10 configured in a container shape with an inner side wall 14 connected to an inner bottom 12 as shown in FIGS. 4A to 4C; An outer container 20 configured in a container shape with an outer side wall 24 connected to an outer bottom 22 and disposed on an outer surface of the inner container 10; A bottom cap 40 coupled to the central portion of the outer bottom 22 of the outer container 20 and fixed to the outer surface of the central portion of the inner bottom 12 of the inner container 10; Induction panel 50 coupled to the outer surface of the outer bottom 22 of the outer container 20; and pre-tension is applied to the inner bottom 12 and the bottom cap 40 of the inner container 10 so that the inner The bottom cap 40 is kept airtightly attached to the outer surface of the floor 12, the bottom cap 40 is coupled to the external container 20 by a coupling member 60, and the bottom ceiling wall 42 ) is made of a structure in close contact with the inner bottom (120).

By the way, in the double cooking vessel combining gas cooking and induction according to Prior Art Document 4, the bottom cap 40 is coupled to the outer container 20 by the coupling member 60, and the bottom ceiling wall 42 is the inner bottom ( 120), the configuration of the bottom cap 40 is not only complicated, but also the productivity is remarkably reduced. In particular, when used for a long period of time, the bottom cap 40 collapses due to the weight of food.

Republic of Korea Patent Registration No. 2308622 Republic of Korea Patent Registration No. 2308627 Republic of Korea Patent Registration No. 2057486 Republic of Korea Patent Publication No. 2021-0079814

An object of the present invention is to intervene a sandwich wedge ring between the inner container and the outer container to irreversibly maintain the height of the air gap, and wrap the inner periphery of the sandwich wedge ring as a center hole wedge so that it is embedded in the inner container so that there is no gap. In addition to guaranteeing confidentiality by, in particular, the upward and downward wedges are driven simultaneously upwards and downwards into the inner and outer containers, so that the sandwich wedge ring is firmly fixed and exposed to the outside due to the concealed structure of the sandwich wedge ring. It is thoroughly eliminated to ensure neatness and longevity, and furthermore, assembling is completed with a simple process of pressing the inner and outer containers at once with a sandwich wedge ring in between, as well as a simple structure, improving assemblyability and productivity. It is to provide a double cooking container.

An object of the present invention is that the center hole wedge is more closely fixed to the inner container, and at the same time, it is fixed while closely surrounding the inner periphery of the sandwich wedge ring, so that the inner container and the outer container cover the upper area of the sandwich wedge ring and the lower area of the sandwich wedge ring. The outer circumference of the center hole wedge and the inner periphery of the sandwich wedge ring are compressed in all directions by the sum of the mutual side areas that are in close contact with each other. It is to provide a double cooking container that realizes.

An object of the present invention is to provide an upper hard ring with a thin thickness in manufacturing a sandwich wedge ring so that the sharpness of the upward wedge and the downward wedge can be sharpened. Provided with the sharpness of the downward wedge, between the upper hard ring and the lower hard ring, a center soft ring with a thickness that can secure the height of the air gap is interposed between the sandwich fixing force and the sufficient height of the air gap. It is to provide a double cooking container that can be guaranteed together.

An object of the present invention is to provide a center soft ring that secures the height of the air gap with an aluminum plate material, and to closely fix the center soft ring and the inner container to each other as the lower wedge and upper wedge of the upper hard ring made of stainless steel, At the same time, the center soft ring and the outer container are tightly fixed with the upper and lower wedges of the under-hard ring made of stainless steel to provide a double cooking container that enables a sufficient air gap to be secured as well as a strong sandwich fixing force.

The present invention for achieving the above object,

In the double cooking container comprising an inner container having an inner surface and an inner surface and an outer container having an outer surface and an outer surface and being incorporated into the inner container with an air gap,

A center hole wedge raised from the center hole drilled in the outer surface toward the inner surface;

At the same time as being sheathed in the center hole wedge, while having an upward wedge and a downward wedge protruding toward the inner and outer surfaces, respectively, the upward wedge together with the center hole wedge causes the inner and outer containers to be compressed. It is a basic feature of its technical configuration that it includes a sandwich wedge ring for providing the air gap by sandwich fixing while being wrapped as the center hole wedge by allowing the downward wedge to be driven into the outer surface at the same time.

The present invention interposes a sandwich wedge ring between the inner container and the outer container to irreversibly maintain the height of the air gap, and wraps the inner periphery of the sandwich wedge ring as a center hole wedge so that it is embedded in the inner container. In addition to guaranteeing airtightness, in particular, the sandwich wedge ring is firmly fixed (upper and lower double and triple driven) by allowing the upward and downward wedges to be simultaneously driven upward and downward into the inner and outer containers, as well as the concealed structure of the sandwich wedge ring. It thoroughly removes exposure to the outside according to the process to ensure neatness and longevity, and furthermore, assembling each other is completed with a simple process of pressing the inner and outer containers at once with the sandwich wedge ring in between, as well as the simple structure. This has the effect of improving assemblyability and productivity.

In the present invention, the center hole wedge is more closely fixed to the inner container, and at the same time, it is fixed while closely surrounding the inner periphery of the sandwich wedge ring, so that the inner container and the outer container cover the upper area of the sandwich wedge ring and the lower area of the sandwich wedge ring as well as the center hole. The outer circumference of the wedge and the inner periphery of the sandwich wedge ring are compressed in all directions by the sum of the mutual side areas that are in close contact with each other, realizing thorough guarantee of confidentiality and bonding power with maximized fixing force and maximized adhesion despite the different heterogeneous composition. has the effect of

The present invention has the effect of ensuring that the upward and downward wedges are alternately provided upward and downward along the sandwich wedge ring to maximize the bonding force through fixation in the vertical direction between the inner container and the outer container.

In the present invention, in manufacturing a sandwich wedge ring to sharpen the sharpness of the upward wedge and the downward wedge, an upper hard ring is provided with a thin thickness to give the sharpness of the upward wedge, and an under hard ring is provided with a thin thickness. With the sharpness of the downward wedge, a center soft ring with a thickness that can secure the height of the air gap is interposed between the upper hard ring and the lower hard ring to ensure a sandwich fixing force and sufficient height of the air gap. There is an effect that allows you to do it.

In the present invention, the center soft ring that secures the height of the air gap is provided with an aluminum plate material, and the center soft ring and the inner container are closely fixed as the upper wedge and lower wedge of the upper hard ring made of stainless steel, and at the same time, the center By tightly fixing the soft ring and the outer container with the downward wedge and upper wedge of the under-hard ring made of stainless steel, there is a unique action and effect of ensuring a sufficient air gap as well as a strong sandwich fixing force.

Figure 1a is an exploded perspective view showing a double cooking vessel according to Prior Art Document 1;
Figure 1b is a longitudinal sectional view showing a double cooking container according to Prior Art Document 1;
Figure 2a is an exploded perspective view showing a double cooking container according to Prior Art Document 2;
Figure 2b is a longitudinal cross-sectional view showing a double cooking container according to Prior Art Document 2;
Figure 3a is an exploded cross-sectional view showing a double cooking container in which confidentiality is maintained according to Prior Art Document 3.
Figure 3b is an enlarged view of an assembly unit showing a double cooking vessel in which confidentiality is maintained according to Prior Art Document 3.
Figure 3c is an enlarged view of the coupling portion showing a double cooking container in which confidentiality is maintained according to Prior Art Document 3.
Figure 4a is an exploded perspective view showing a double cooking container combining gas cooking and induction according to Prior Art Document 4;
Figure 4b is a longitudinal cross-sectional view showing a double cooking container combining gas cooking and induction according to Prior Art Document 4;
Figure 4b is an enlarged view showing a main part of a double cooking container combining gas cooking and induction according to Prior Art Document 4.
Figure 5a is an exploded cross-sectional view showing a double cooking container according to an embodiment of the present invention.
Figure 5b is a longitudinal cross-sectional view showing a double cooking container according to an embodiment of the present invention.
Figure 6a is an exploded cross-sectional view showing a double cooking container according to another embodiment of the present invention.
Figure 6b is a longitudinal sectional view showing a double cooking container according to another embodiment of the present invention.

A preferred embodiment of the double cooking container according to the present invention will be described with reference to the drawings, and a plurality of examples may exist, and the purpose, characteristics and advantages of the present invention can be better understood through these embodiments. there will be

5A is an exploded cross-sectional view showing a double cooking container according to an embodiment of the present invention, and FIG. 5B is a longitudinal cross-sectional view showing the double cooking container according to an embodiment of the present invention.

As shown in FIGS. 5A and 5B , the double cooking vessel according to the present invention includes an inner container 70 having an inner surface 71 and an inner surface 72 and an outer surface 81 and an outer surface 82. It includes an outer container 80 that is incorporated into the inner container 70 while holding an air gap (A).

As a combination of the inner container 70 and the outer container 80, the temperature of the outside is prevented from reaching the inner container 70 by the air gap (A), so that the heat preservation power of the food is maintained, while the temperature of the food is maintained in the air gap (A ) so that it does not reach the outer container 80 so that the heat when gripped by hand after cooking can be reduced as much as possible. It allows you to cook well, allowing you to cook delicious and high-quality dishes.

According to the features of the present invention, the double cooking container is enclosed in a central hole wedge 81b raised from the center hole 81a on the outer surface 81 toward the inner surface 71 and the center hole wedge 81b. At the same time, the center hole wedge 81b when the inner container 70 and the outer container 80 are compressed while having the upward wedge 90a and the downward wedge 90b protruding toward the inner surface 71 and the outer surface 81, respectively. ) In addition, the upward wedge (90a) is driven into the inner surface (71) and the downward wedge (90b) is driven into the outer surface (81) so that it is wrapped as a center hole wedge (81b) and sandwich fixing (Fixing) ) and includes a sandwich wedge ring 90 for providing an air gap (A).

As mentioned above, the air gap (A) in the double cooking vessel has various advantages, and in order to maximize these advantages, the inner container 70 and the outer container 80 are kept confidential together with the distance between each other and exposed to the outside. Minimization of cumbersomeness becomes an important factor.

In the present invention, the sandwich wedge ring 90 is interposed between the inner container 70 and the outer container 80 to irreversibly maintain the height of the air gap A, and as a center hole wedge 81b, the sandwich wedge ring ( 90) to be embedded in the inner container 70 while wrapping the inner periphery so that the airtightness is ensured by the structure without gaps, and in particular, the upward wedge 90a and the downward wedge 90b allow the inner container 70 and the outer container ( 80) is driven upward and downward at the same time, so that the sandwich wedge ring 90 is firmly fixed (upper and lower double and triple driven), and the exposure to the outside due to the concealed structure of the sandwich wedge ring 90 is thoroughly eliminated to ensure neatness. In addition, it guarantees the lifespan, and furthermore, a simple process of pressing the inner container 70 and the outer container 80 at once with the sandwich wedge ring 90 in between, as well as a simple structure, completes mutual assembly To maximize assembly and productivity.

Preferably, the center hole wedge 81b is raised from the center hole 81a toward the inner surface 71 and expands outward, so that when the inner container 70 and the outer container 80 are compressed, the sandwich wedge ring 90 The center hole wedge 81b is more closely fixed to the inner container 70 by providing an outward extension 81c embedded in the inner surface 71 while wrapping the inner periphery, and at the same time the inner periphery of the sandwich wedge ring 90 The inner container 70 and the outer container 80 are fixed while tightly wrapping the inner container 70 and the outer container 80 in the upper area of the sandwich wedge ring 90 and the lower area of the sandwich wedge ring 90 and furthermore the outer periphery of the center hole wedge 81b and the sandwich The inner periphery of the wedge ring 90 is compressed in all directions by the sum of the mutual side areas that are in close contact with each other, so that despite the different types of configuration, thorough guarantee of confidentiality and bonding force is realized with maximized fixing force and maximized adhesion.

At this time, the upward wedge (90a) and the downward wedge (90b) are provided alternately upward and downward along the sandwich wedge ring (90) to increase the bonding force between the inner container (70) and the outer container (80) through vertical fixation. Maximization is ensured together.

6A is an exploded cross-sectional view showing a double cooking container according to another embodiment of the present invention, and FIG. 6B is a longitudinal cross-sectional view showing a double cooking container according to another embodiment of the present invention.

Sandwich wedge ring 90 applied to a double cooking vessel according to another embodiment of the present invention is a center soft ring 91 that secures the height of the air gap A, as shown in FIGS. 6A and 6B, and the center An upper hard ring 92 having an upward wedge 90a fixed to the upper side of the soft ring 91 and an under hard ring 93 having a downward wedge 90b fixed to the lower side of the center soft ring 91 include

In the case of manufacturing a double cooking container according to the present invention, the sandwich wedge ring 90 must be hard enough to be directly embedded in the inner container 70 and the outer container 80, and the inner container 70 and the outer container 80 should be relatively soft enough that the upward wedge 90a and the downward wedge 90b can be well driven (acceptable).

Under these conditions, the wedge force of the upward wedge 90a and the downward wedge 90b provided by the piercing of the sandwich wedge ring 90 itself depends on the thickness and material of the sandwich wedge ring 90, and the temperature of the food If the height of the air gap (A) is to be increased for preservation, the thickness of the sandwich wedge ring (90) must be proportionally increased. In this case, the sharpness of the upward wedge (90a) and the downward wedge (90b) is relatively inevitably deteriorate In view of this, when the thickness of the sandwich wedge ring 90 is reduced, the sharpness of the upward wedge 90a and the downward wedge 90b can be sharp, but the height of the air gap A is relatively small, so that the food temperature can be preserved. There is bound to be a phenomenon that cannot be fully realized.

Accordingly, in the present invention, in manufacturing the sandwich wedge ring 90 so that the sharpness of the upward wedge 90a and the downward wedge 90b can be sharpened, an upper hard ring 92 is provided with a thin thickness, and the upward wedge 90a ) In addition to providing the sharpness of the lower hard ring 93 with a thin thickness, the air gap between the upper hard ring 92 and the under hard ring 93 in a state where the sharpness of the downward wedge 90b is given By interposing a center soft ring 91 having a thickness capable of securing the height of A), a sufficient height of the air gap A can be guaranteed together with mutual sandwich fixing force.

Specifically, the center soft ring 91 may be made of an aluminum plate material, the upper hard ring 92 is made of stainless steel and has a lower wedge 92a driven into the center soft ring 91, and the under hard ring ( 93) is made of stainless steel and is provided with an upper wedge 93a driven into the center soft ring 91.

A center soft ring 91 that secures the height of the air gap A is provided with an aluminum plate material, and the center soft ring 91 and the inner container 70 are connected to each other on the lower side of the upper hard ring 92 made of stainless steel The wedge 92a and the upper wedge 90a tightly fix the center soft ring 91 and the outer container 80 to each other, the upper wedge 93a and the lower wedge of the under hard ring 93 made of stainless steel As (90b), it is tightly fixed to simultaneously satisfy the unique action and effect of securing sufficient air gap (A) as well as a strong sandwich fixing force.

With this configuration, the heat sensor of the gas range can directly contact the inner surface 71 of the inner container 70 via the central hole 81a of the outer container 80, thereby determining whether food is present or not. By accurately realizing the temperature detection, safety accidents can be completely eliminated through error-free on-off operation of the gas range.

The present invention can be used in the industrial field related to cooking containers for cooking, boiling, or baking food, and, of course, a multi-stage sandwich structure of sandwich wedge rings is also possible if necessary.

70: contents 71: inner surface
72: inner side 80: outer container
81: outer surface 81a: center hole
81b: center hole wedge 81c: outward extension
82: outer surface A: air gap
90: sandwich wedge ring 90a: upward wedge
90b: downward wedge 91: center soft ring
92: upper hard ring 92a: lower wedge
93: under hard ring 93a: upper wedge

Claims (5)

An inner surface 71 and an inner surface 72 having an inner surface 70 and an outer surface 81 and an outer surface 82 having an air gap (A) incorporated into the inner surface 70 In the double cooking container including the outer container 80,
A center hole wedge (81b) raised from the center hole (81a) drilled in the outer surface (81) toward the inner surface (71), and the inner surface (71) at the same time as being external to the center hole wedge (81b) And while having an upward wedge (90a) and a downward wedge (90b) protruding toward the outer surface (81), together with the center hole wedge (81b) when compressing the inner container (70) and the outer container (80). Sandwich fixing while being wrapped as the center hole wedge 81b by allowing the upward wedge 90a to be driven into the inner surface 71 and the downward wedge 90b to be driven into the outer surface 81 at the same time It includes a sandwich wedge ring 90 providing the air gap (A),
The center hole wedge 81b extends outward while rising from the center hole 81a toward the inner surface 71, and when the inner container 70 and the outer container 80 are compressed, the sandwich wedge ring 90 ) The double cooking vessel characterized in that it has an outward extension (81c) embedded in the inner lower surface (71) while surrounding the inner periphery of the. delete According to claim 1,
The double cooking container, characterized in that the upward wedge (90a) and the downward wedge (90b) are provided alternately upward and downward along the sandwich wedge ring (90). According to claim 1 or 3,
The sandwich wedge ring 90 is
A center soft ring 91 for securing the height of the air gap A;
An upper hard ring 92 having the upward wedge 90a while being fixed to the upper side of the center soft ring 91;
The double cooking vessel characterized in that it includes an under hard ring 93 having the downward wedge 90b while being fixed to the lower side of the center soft ring 91. According to claim 4,
The center soft ring 91 is made of an aluminum plate,
The upper hard ring 92 is made of stainless steel and has a lower wedge 92a driven into the center soft ring 91,
The double cooking container, characterized in that the under hard ring (93) is made of stainless steel and has an upper wedge (93a) inserted into the center soft ring (91).

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