Top ring and roaster
The top ring design for roasters addresses excessive air intake by guiding air intake to minimize heated air diffusion and reduce suction force, resulting in lower energy consumption and noise levels.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SHINPO CO LTD
- Filing Date
- 2024-12-04
- Publication Date
- 2026-06-16
AI Technical Summary
Conventional roasters face issues with excessive indoor air suction, leading to increased electricity consumption and noise due to unnecessary air intake, which is not effectively minimized.
A top ring design for roasters featuring a ring-shaped cover with air intake holes and annular walls that partition the suction space, guiding air intake to minimize heated air diffusion and reduce suction force, thereby reducing energy consumption and noise.
The top ring design suppresses the rise in outer casing temperature and minimizes indoor air intake, achieving lower energy consumption and reduced noise levels while maintaining effective smoke extraction.
Smart Images
Figure 2026097052000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a top ring used for a roaster for cooking ingredients such as meat and vegetables by heating, and a roaster.
Background Art
[0002] Patent Document 1 discloses a technique capable of suppressing an increase in the surface temperature of an outer casing by adopting a top ring configured to allow indoor air to flow outside a space through which hot smoke generated during cooking flows, in a smokeless roaster in which a suction space for sucking smoke generated during cooking is formed between an inner casing and an outer casing.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] Although the above conventional technology has made it possible to suppress an increase in the surface temperature of the outer casing, there remains a problem of minimizing the indoor air sucked into the suction space as much as possible. If more indoor air than necessary is sucked into the suction space, there are inconveniences such as an increase in the electricity consumption of the air conditioner for keeping the indoor temperature comfortable, or an increase in the noise generated when sucking air. Therefore, it is important to minimize the indoor air sucked into the suction space.
[0005] The present invention has been made in view of such circumstances, and provides a top ring for a roaster and a roaster capable of suppressing an increase in the surface temperature of an outer casing and minimizing the indoor air sucked into a suction space as much as possible.
Means for Solving the Problems
[0006] The present invention provides the following: [1] A top ring used in a roaster in which a heating and cooking device is positioned below an opening in the tabletop, comprising a ring-shaped cover portion, a first annular wall portion, and a second annular wall portion, wherein the heating and cooking device comprises an inner casing and an outer casing, the inner casing is configured to open upward and to house the heating and cooking unit, the outer casing is configured to open upward and to house the inner casing, a suction space for sucking up smoke generated in the heating and cooking unit is provided between the inner casing and the outer casing, the ring-shaped cover portion is configured to cover the upper part of the suction space, and comprises a canopy portion and a multiple A top ring having a number of air intake holes, wherein the first annular wall portion and the second annular wall portion are configured to extend downward from the ring-shaped cover portion, the first annular wall portion is positioned to overlap the upper end of the inner casing and has a number of smoke intake holes for drawing smoke generated in the heating cooking portion into the suction space, the second annular wall portion is positioned outside the first annular wall portion and is configured to partition the upper part of the suction space into an inner suction space and an outer suction space, the eaves portion is configured to protrude inward from the first annular wall portion, and the number of air intake holes are provided on the outer circumference of the ring-shaped cover portion and are configured to draw air above the ring-shaped cover portion into the outer suction space. A top ring as described in [2][1], wherein a horizontally extending smoke guide surface is provided at the upper part of the inner suction space. A top ring according to [3][1] or [2], wherein the opening formed by the eaves portion is elliptical. A top ring according to any one of items [4][1] to [3], wherein the vertical centers of the plurality of smoke intake holes are located at the same height as the vertical center of the first annular wall portion or below the vertical center of the first annular wall portion. A top ring according to any one of items [5][1] to [4], wherein the plurality of smoke intake holes are elongated vertically. [6] A roaster for heating and cooking, comprising a table, a heating and cooking device, and a top ring, wherein the table has a top plate portion having an opening, the top ring is the top ring described in any one of [1] to [5], the heating and cooking device is positioned below the opening and comprises an inner casing and an outer casing, the inner casing is configured to open upward and to house a heating and cooking section, the outer casing is configured to open upward and to house the inner casing, and a suction space is provided between the inner casing and the outer casing for sucking up smoke generated in the heating and cooking section. [Effects of the Invention]
[0007] In the top ring of the present invention, the overhang provided on the ring-shaped cover prevents the air heated by the cooking section from diffusing onto the top ring. Therefore, even when air is drawn in from above the top ring through the air intake holes, the air heated by the cooking section is less likely to be drawn into the air intake holes. As a result, it is easier to supply low-temperature air with a high cooling effect to the intake space. Furthermore, since the intake path is simple, only drawing the air above the top ring downwards, it is possible to set the suction force of the exhaust fan in the exhaust duct to a lower level. Therefore, it is possible to suppress the rise in the surface temperature of the outer casing while minimizing the amount of indoor air drawn into the intake space. [Brief explanation of the drawing]
[0008] [Figure 1] Figure 1A is a perspective view of a roaster 1 according to one embodiment of the present invention, and Figure 1B is a perspective view of a heating and cooking device 3 located below the opening 2C of the top plate portion 2A of the table 2 of the roaster 1. [Figure 2]Figure 2 is a cross-sectional view AA of the roaster 1 in Figure 1A, showing an enlarged view of the vicinity of the heating and cooking device 3. [Figure 3] Figure 3A is a perspective view from above of the top ring 20 located on top of the roaster 1 in Figure 1A, and Figure 3B is a perspective view from below of the top ring 20. [Figure 4] Figure 4 is an enlarged view of region B in Figure 2. [Figure 5] Figures 5A to 5D show the top ring 20 of Figure 3, representing the front view, top view, left side view, and bottom view, respectively. The right side view and rear view have the same shape as the front view. [Figure 6] Figure 6A is a cross-sectional view of AA in Figure 5B, and Figure 6B is a cross-sectional view of BB in Figure 5B. [Figure 7] Figures 7A to 7D show the top ring 20 of Figure 3, with the front view, top view, left side view, and bottom view being shown respectively. The right side view and rear view have the same shape as the front view. Figures 7A to 7D show an example of a part for which design registration is sought as a partial design, represented by a solid line. [Figure 8] Figure 8A is a perspective view of the top ring 20A of another embodiment, viewed from above, and Figure 8B is a perspective view of the top ring 20A, viewed from below. [Figure 9] Figures 9A to 9D show the top ring 20A from Figure 8, representing the front view, top view, left side view, and bottom view, respectively. The right side view has the same shape as the left side view, and the rear view has the same shape as the front view. [Figure 10] Figure 10 is a perspective view showing the configuration of the mounting ring 2D on which the top ring 20A is mounted. [Modes for carrying out the invention]
[0009] Embodiments of the present invention will be described below. The various features shown in the embodiments below can be combined with each other. Furthermore, each feature constitutes an independent invention.
[0010] <Overview of Roaster 1> As shown in Figures 1A and 1B, the roaster 1 is a cooking device for heating and cooking ingredients such as meat and vegetables, and comprises a table 2 and a cooking device 3. The table 2 comprises a top plate 2A and a support section 2B. The top plate 2A has an opening 2C in the center. The support section 2B has a hollow structure and is configured so that the internal space can be opened by removing the side panels. This internal space houses the cooking device 3, a gas unit that supplies gas to the cooking device 3, sensors, a power unit, etc. The cooking device 3 is positioned below the opening 2C, and the top of the cooking device 3 is open to the top of the table 2 through the opening 2C.
[0011] The gas unit, located in the internal space of table 2, includes, for example, a pilot burner, a spark plug, a valve, a gas supply pipe, etc. The pilot burner is configured to ignite the gas burner 35 used in the heating and cooking device 3 described later. The spark plug is configured to ignite the pilot burner.
[0012] As shown in Figure 2, the cooking device 3 comprises a cooking section 3A and an exhaust section 3B. The cooking section 3A and the exhaust section 3B are arranged vertically so as to overlap in a plan view. The cooking section 3A is positioned so that its upper part is exposed upward from the opening 2C. The exhaust section 3B uses the suction force of an exhaust fan in the exhaust duct to suck up smoke, oil droplets, etc. (hereinafter collectively referred to as smoke) generated in the cooking section 3A. The exhaust section 3B then discharges the smoke to the outside of the roaster 1 via a connecting tube 10 and the exhaust duct connected thereto. The connecting tube 10 is equipped with a fire damper and a fall prevention net. The fire damper activates when the exhaust temperature exceeds a predetermined temperature (e.g., about 140°C) and closes the flow path in the connecting tube 10. This prevents the abnormally hot exhaust from flowing into the exhaust duct. As a result, ignition of oil accumulated in the duct is prevented.
[0013] The cooking device 3 includes an outer casing 31, an inner casing 32, a top ring 20, and a food placement member 34. The outer casing 31 is generally cylindrical and open at the top. The outer casing 31 is configured to accommodate the inner casing 32. The outer casing 31 is configured such that its cross-sectional area decreases from top to bottom, that is, as it approaches the exhaust portion 3B.
[0014] The inner casing 32 is generally cylindrical with a bottom and open at the top. Also, the inner casing 32 is configured to accommodate the cooking section 3A. A suction space 33 is provided between the outer casing 31 and the inner casing 32 to suction the smoke generated in the cooking section 3A. A drain pan 32A is disposed at the bottom of the inner casing 32. The drain pan 32A is configured to hold water inside to prevent overheating and adhesion of dirt.
[0015] A support portion 32B is provided at the upper part of the inner casing 32, and the food placement member 34 is placed on the support portion 32B. In this embodiment, the food placement member 34 is a wire mesh, but it is also possible to use a rost or the like other than the wire mesh. Inside the inner casing 32, a gas burner 35 and a plurality of lava ceramics 36 as the cooking section 3A are arranged. The plurality of lava ceramics 36 are placed, for example, on a lattice-shaped firebed and are heated to red heat by the flame from the gas burner 35.
[0016] <Overview of the top ring 20> The top ring 20 is detachably placed on a placement ring 2D provided at the peripheral edge of the opening 2C of the table 2. The placement ring 2D is generally cylindrical, and a flange portion protruding outward from its upper end is connected to the peripheral edge of the opening 2C of the table 2. Also, the lower end of the placement ring 2D is arranged to overlap the upper end of the outer casing 31 in plan view.
[0017] As shown in Figures 3A and 3B, the top ring 20 is generally cylindrical in shape and comprises a ring-shaped cover portion 21, a first annular wall portion 22, and a second annular wall portion 23. The ring-shaped cover portion 21 is annular in shape in plan view and is configured to cover the upper part of the suction space 33. The ring-shaped cover portion 21 has a visor portion 21A and a plurality of air intake holes 21B. The visor portion 21A is configured to protrude inward from the first annular wall portion 22. The visor portion 21A is configured to protrude in a flange-like manner on the inner circumference of the top ring 20, and the amount of protrusion is adjusted so that the opening formed by the visor portion 21A is elliptical.
[0018] Each of the multiple air intake holes 21B is located on the outer circumference of the ring-shaped cover portion 21. The outer circumference of the ring-shaped cover portion 21 is provided with an inclined surface 21C that slopes outward, and the multiple air intake holes 21B are provided on this inclined surface 21C. The multiple air intake holes 21B are configured to draw air from above the table 2 into the suction space 33 (more specifically, the outer suction space 33B described later).
[0019] The first annular wall portion 22 is configured to extend downward from the lower surface of the ring-shaped cover portion 21. The first annular wall portion 22 is positioned to overlap the upper end of the inner casing 32 in a plan view and has a plurality of smoke intake holes 22A for sucking up smoke generated in the heating and cooking portion 3A. The plurality of smoke intake holes 22A are provided at the lower part of the first annular wall portion 22. In other words, the vertical centers of the plurality of smoke intake holes 22A are located below the vertical center of the first annular wall portion 22, and a predetermined distance (for example, about 10 to 40% of the vertical length of the first annular wall portion 22) is provided between the upper end of the smoke intake holes 22A and the upper end of the first annular wall portion 22. However, as long as a predetermined distance is provided between the upper end of the smoke intake holes 22A and the upper end of the first annular wall portion 22, the vertical centers of the plurality of smoke intake holes 22A may be at the same height as the vertical center of the first annular wall portion 22. Furthermore, each of the multiple smoke intake holes 22A has a vertically elongated shape (in this case, oval or rounded rectangular shape). If the upper end of the smoke intake hole 22A is close to the upper end of the first annular wall portion 22, a problem may occur in which smoke is not smoothly sucked in. This is because although a flow in almost the same direction occurs in the vicinity of the smoke flow sucked in by the smoke intake hole 22A, if the upper end of the smoke intake hole 22A is close to the upper end of the first annular wall portion 22, the smoke in that vicinity is above the eaves portion 21A and therefore flows outward over the top of the top ring 20 without being sucked in by the smoke intake hole 22A. In this embodiment, since vertically elongated smoke intake holes 22A are provided at the lower part of the first annular wall portion 22, such a problem is less likely to occur.
[0020] The second annular wall portion 23 is configured to extend downward from the lower surface of the ring-shaped cover portion 21, similar to the first annular wall portion 22. The second annular wall portion 23 is positioned outside the first annular wall portion 22. The second annular wall portion 23 is configured to divide the upper part of the suction space 33 into an inner suction space 33A and an outer suction space 33B (see Figure 4).
[0021] When the top ring 20 is placed on the mounting ring 2D, the outer casing 31, inner casing 32, and top ring 20 form a suction space 33, and the upper part of the suction space 33 is divided into an inner suction space 33A and an outer suction space 33B. The lower part of the suction space 33 is configured to extend toward a filter 11 provided below the inner casing 32. The filter 11 is composed of, for example, multiple metal rings stacked vertically. Smoke sucked downward in the suction space 33 has oils and other substances contained in the smoke removed by the filter 11 and is then discharged to the connecting tube 10 and exhaust duct.
[0022] <Roaster 1 operation, Top Ring 20 function> When the gas burner 35 of the roaster 1 is activated, the flame from the gas burner 35 heats the air and generates hot air. The flame and hot air from the gas burner 35 heat the multiple lava ceramics 36. The radiant heat emitted from the multiple lava ceramics 36 and the hot air passing between the multiple lava ceramics 36 heat the food on the food placement member 34. The smoke generated from the food is sucked in through the multiple smoke intake holes 22A provided in the top ring 20 and guided into the inner suction space 33A.
[0023] As shown in Figure 4, the high-temperature smoke introduced into the inner suction space 33A is cooled by mixing with ambient temperature air introduced in the suction space 33 through multiple air intake holes 21B and the outer suction space 33B. Furthermore, the flow of ambient temperature air along the inner surface of the outer casing 31 acts like an air curtain, preventing the high-temperature smoke from directly contacting the outer casing 31. This prevents the outer casing 31 from being excessively heated by the high-temperature smoke. In addition, as the high-temperature smoke is cooled by mixing with low-temperature air in the suction space 33, oil droplets (oil mist) are more easily liquefied and can be efficiently collected by the filter 11.
[0024] The ring-shaped cover portion 21 is provided with a large overhang 21A over its entire inner circumference, which prevents air heated by the cooking portion 3A from diffusing onto the top ring 20. In addition, multiple air intake holes 21B are provided on an inclined surface 21C that slopes outward, making it easy to draw in air on the opposite side of the cooking portion 3A, thus preventing air heated by the cooking portion 3A from being drawn in through the air intake holes 21B. Furthermore, because the path from the air intake holes 21B through the outer suction space 33B and suction space 33 to the filter 11 is simple, even if the suction force of the exhaust fan in the exhaust duct is set to a low value, it is possible to smoothly introduce relatively low-temperature air from the air intake holes 21B into the outer suction space 33B. As a result, a suitable cooling effect can be obtained without increasing the amount of air drawn into the exhaust duct.
[0025] Furthermore, a horizontally extending smoke guide surface 21D is provided at the top of the inner suction space 33A. The direction of smoke flow in the inner suction space 33A is determined by the shape of the top of the inner suction space 33A. Then, the direction of smoke flow outside the inner suction space 33A is determined according to the direction of smoke flow in the inner suction space 33A. As in this embodiment, by providing a smoke guide surface 21D to direct the smoke flow in the inner suction space 33A horizontally, it becomes possible to efficiently suck up smoke generated in the heating and cooking section 3A horizontally. For example, if the smoke flow in the inner suction space 33A is inclined downwards toward the outside, it is easy for the inconvenience of sucking up more air above the heating and cooking section 3A than necessary to occur. In contrast, in this embodiment, since the smoke flow in the inner suction space 33A is horizontal and a large overhang 21A is provided, such inconveniences are less likely to occur. In the inner suction space 33A, the smoke drawn horizontally outward strikes the second annular wall portion 23, then changes direction downward and is drawn directly into the suction space 33.
[0026] <Details of the Top Ring 20 configuration> The top ring 20 also possesses design features in terms of its distinctive appearance. Figures 5A to 5D show the top ring 20 of Figure 3, representing the front view, top view, left side view, and bottom view, respectively. The right side view and rear view are omitted as they have the same shape as the front view. In plan view, the opening 24 formed by the above-mentioned eaves portion 21A has an elliptical diameter of 246 mm in the major axis and 230 mm in the minor axis. However, these dimensions are merely examples, and the present invention is not limited thereto. In Figure 5B, the left-right direction is the major axis direction, and the up-down direction is the minor axis direction. The arrangement of the air intake holes 21B is designed to specify the position of the major axis. Specifically, there is a location where the arrangement of air intake holes 21B is missing, as shown in the left side view of Figure 5C. If the air intake holes 21B are arranged at equal intervals along the circumferential surface of the top ring 20, it is possible to provide 48 holes. However, there is a missing section where the air intake holes 21B are not provided, corresponding to the long axis (to the left of the opening 24 in Figure 5B). In this case, the number of air intake holes 21B is 46 (2 missing). Note that the missing section of the air intake holes 21B does not appear in the front view, right side view, and rear view of the top ring 20.
[0027] Figure 6A is a cross-sectional view AA of Figure 5B, and Figure 6B is a cross-sectional view BB of Figure 5B. In Figure 6A, the eaves portion 21A extends more inward than in Figure 6B. By making the eaves portion 21A larger, it becomes more difficult for the air in the room where the roaster 1 is installed to be drawn into the smoke intake hole 22A, but on the other hand, it becomes more difficult to install a round grilling net or the like through the opening 24. Of course, the opening 24 must be larger than the diameter of the food placement member 34, but here, by devising the shape of the eaves portion 21A, the opening 24 is elliptical, so as long as the major axis of the ellipse is larger than the diameter of the food placement member 34, it is possible to pass a round grilling net through the opening 24 while tilting it appropriately, even if the minor axis is smaller than the diameter. When attaching and removing the grilling net, the direction of the major axis of the opening 24 can be immediately determined by looking at the arrangement of the air intake holes 21B.
[0028] The top ring 20 has a novel aesthetic appearance. Any part of the top ring 20 can be designated as a part for which design registration is sought as a partial design, and the part shown in Figure 7 is an example. In Figure 7, the part shown by the solid line is the part for which design registration is sought as a partial design. While the design of the top ring 20 shown in Figure 5 above can be understood as an overall design, the part shown by the solid line in Figure 7 (the eaves portion 21A and the smoke intake hole 22A) can also be understood as the "part for which design registration is sought as a partial design."
[0029] According to the Roaster 1 described above, it is possible to set the suction force of the exhaust fan in the exhaust duct to a weaker setting, thereby reducing noise and saving energy for the air conditioner. For example, even when Roaster 1 is installed in a private room of a high-end restaurant, it becomes easier to maintain quietness and comfortable room temperature.
[0030] <Details of the Top Ring 20A configuration> Next, a top ring 20A of another embodiment will be described using Figures 8 to 10. Figure 8A is a perspective view of the top ring 20A of another embodiment, viewed from above, and Figure 8B is a perspective view of the top ring 20A, viewed from below. The top ring 20A has the same basic configuration as the top ring 20 described above. However, the top ring 20A differs from the top ring 20 described above in that it does not have a gap in the arrangement of air intake holes 21B, and that it is provided with a positioning portion 21E.
[0031] The top ring 20A also has design features in terms of its distinctive appearance. Figures 9A to 9D show the top ring 20A from Figure 8, and represent the front view, top view, left side view, and bottom view, respectively. The right side view is omitted as it has the same shape as the left side view. The rear view is also omitted as it has the same shape as the front view. The ring-shaped cover portion 21 is provided with positioning portions 21E for specifying the long axis direction (left-right direction in Figure 9B) of the opening 24. Here, the positioning portions 21E are notches provided in two places on the ring-shaped cover portion 21.
[0032] On the other hand, as shown in Figure 10, the mounting ring 2D on which the top ring 20A is placed is provided with a protrusion 2D1. The protrusion 2D1 is configured to be engageable with the positioning portion 21E. When placing the top ring 20A on the mounting ring 2D, by placing the positioning portion 21E on top of the protrusion 2D1, the long axis direction will be aligned with the left-right direction, as shown in Figure 9B. Therefore, it becomes possible to immediately determine which direction the long axis direction of the opening 24 is facing. Here, an example is shown in which two positioning portions 21E and one protrusion 2D1 are provided, but this is not the only option. Two positioning portions 21E and two protrusions 2D1 may be provided, or only one positioning portion 21E and one protrusion 2D1 may be provided. It is also possible to replace the positioning portion 21E with a protrusion and the protrusion 2D1 with a recess.
[0033] The top ring 20 and top ring 20A described above have an elliptical opening 24 formed by the overhang portion 21A, but since they are provided with markings to identify the orientation of the opening 24 in the long axis direction (or short axis direction) (such as the absence of the air intake holes 21B mentioned above or the positioning portion 21E), the user will not be confused when placing them on the mounting ring 2D.
[0034] <Other Embodiments> Although an example has been described in which a gas burner 35 and multiple lava ceramics 36 are used as the heating and cooking section 3A, an electric heating element may be used instead of the gas burner 35, or a metal heating plate may be used instead of the lava ceramics 36. In the roaster 1 described above, the table 2 is rectangular in plan view and the heating device 3 is circular in plan view, but the shape is not limited to this. The table 2 may be circular or elliptical in plan view, and the heating device 3 may be polygonal in plan view. • An example was shown in which the missing locations in the arrangement of the air intake holes 21B and the positions of the positioning parts 21E are determined by corresponding them to the major axis of the elliptical opening 24, but these may also be provided corresponding to the minor axis. Alternatively, other markers may be used instead of the missing locations in the arrangement of the air intake holes 21B and the positioning parts 21E. In any case, the direction of the ellipse of the opening 24 becomes easier to determine than when there are no markers, which has the advantage of making it easier for the user to understand the direction in which to tilt the food placement member 34. [Explanation of Symbols]
[0035] 1: Roaster 2: Table 2A: Top panel 2B: Support part 2C: Opening 2D: Mounting ring 3:Heating cooking device 3A:Heating cooking section 3B:Exhaust part 10: Connecting tube 11: Filter 20: Top Ring 21: Ring-shaped cover part 21A: Eaves 21B: Air intake port 21C: Inclined surface 21D: Smoke guide surface 22: First annular wall section 22A: Smoke suction hole 23: Second annular wall section 24: Opening 31: Outer casing 32: Inner casing 32A: Drain pan 32B: Support part 33: Suction space 33A:Inner suction space 33B:Outer suction space 34: Food ingredient placement component 35: Gas burner 36: Lava Ceramics
Claims
1. A top ring used in a roaster in which a heating and cooking device is positioned below an opening in the tabletop, comprising a ring-shaped cover portion, a first annular wall portion, and a second annular wall portion. The aforementioned heating and cooking device comprises an inner casing and an outer casing. The inner casing is configured to open upwards and to house the heating and cooking section. The outer casing is configured to open upward and to house the inner casing. A suction space is provided between the inner casing and the outer casing for sucking up smoke generated in the heating and cooking section. The ring-shaped cover portion is configured to cover the upper part of the suction space and has a visor portion and a plurality of air suction holes. The first annular wall portion and the second annular wall portion are configured to extend downward from the ring-shaped cover portion, The first annular wall portion is positioned to overlap the upper end of the inner casing and has a plurality of smoke suction holes for drawing smoke generated in the heating cooking section into the suction space. The second annular wall portion is positioned outside the first annular wall portion and is configured to divide the upper part of the suction space into an inner suction space and an outer suction space. The canopy portion is configured to protrude inward from the first annular wall portion. The top ring is provided with the plurality of air intake holes on the outer circumference of the ring-shaped cover portion and is configured to draw air from above the ring-shaped cover portion into the outer suction space.
2. The top ring according to claim 1, A top ring having a horizontally extending smoke guide surface at the top of the aforementioned inner suction space.
3. A top ring according to claim 1 or claim 2, A top ring in which the opening formed by the aforementioned overhang portion is elliptical.
4. A top ring according to claim 1 or claim 2, A top ring in which the vertical centers of the plurality of smoke intake holes are located at the same height as the vertical center of the first annular wall portion or below the vertical center of the first annular wall portion.
5. A top ring according to claim 1 or claim 2, The top ring has multiple smoke intake holes that are elongated vertically.
6. A roaster for heating and cooking, comprising a table, a heating device, and a top ring, The aforementioned table has a top surface having an opening, The top ring is the top ring described in claim 1 or claim 2. The heating and cooking device is positioned below the opening and comprises an inner casing and an outer casing. The inner casing is configured to open upwards and to house the heating and cooking section. The outer casing is configured to open upward and to house the inner casing. A roaster having a suction space between the inner casing and the outer casing for sucking up smoke generated in the heating and cooking section.