JP7526487B2 - Burner cap manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a burner cap.

The stove burner disclosed in Patent Document 1 includes a burner cap and a burner cover. The burner cap is an annular member placed on the burner body. An annular wall is provided on the underside of the burner cap. A plurality of flame ports are formed in the annular wall. The upper surface of the burner cap is provided with three circumferential holes of the same diameter. The burner cover covers the burner cap from above. An annular plate is attached to the underside of the burner cover. Claws that protrude downward are provided at three circumferential locations on the outer periphery of the annular plate. The burner cover is fixed to the burner cap by pressing the claws of the burner cover into the holes of the burner cap.

JP 2017-116193 A

In a configuration like that of Patent Document 1, a process of fixing the upper plate (burner cover) and the lower plate (annular plate) together is required to manufacture the members (burner cover and annular plate) that cover the burner cap. One possible method of fixing the upper plate and the lower plate is to fix them by welding. However, this fixing method is likely to leave weld marks on the surface of the upper plate (burner cover), which can easily lead to a deterioration in aesthetics. It is also possible to carry out a separate process of removing the weld marks to prevent the deterioration in aesthetics, but in this case, the number of steps will increase and the manufacturing process is likely to become complicated.

This disclosure provides a manufacturing method that can employ a method for fixing the cover body to the burner cap body in a simpler configuration that is less likely to cause a loss of aesthetic appeal.

A method for manufacturing a burner cap according to the present disclosure includes:
A manufacturing method for manufacturing a burner cap including a burner cap body having a cylindrical portion and a flange portion extending from the cylindrical portion,
A manufacturing method in which a post-process is performed according to either a first method of attaching a cover body to the burner cap body or a second method of not attaching the cover body to the burner cap body,
When performing a post-process according to the first method, an assembly process is performed in which the cover body is assembled to the burner cap body,
When performing a post-process according to the second method, a surface treatment process is performed on at least the upper surface of the flange portion of the burner cap body,
the cover body is configured to be integral with an annular main body portion that covers the flange portion from above and a protrusion that protrudes downward from an inner edge portion of the main body portion,
In the assembly process, the protrusion is inserted into the cylindrical portion, and the cover body is fixed to the burner cap body in a configuration in which the protrusion and the cylindrical portion are in contact with each other inside the cylindrical portion.

A method for manufacturing a burner cap according to the present disclosure includes:
A manufacturing method for manufacturing a burner cap including a burner cap body having a cylindrical portion and a flange portion extending from the cylindrical portion,
A body forming process which is a process of forming the burner cap body;
a cover body forming step for forming a cover body to be attached to the burner cap body;
an assembling step of assembling the cover body formed by the cover body forming step to the burner cap body;
Including,
In the cover body forming step, the cover body is formed by integrally providing an annular main body portion that covers the flange portion from above and a protrusion portion that protrudes downward from an inner edge portion of the main body portion,
In the assembly process, the protrusion is inserted into the cylindrical portion, and the cover body is fixed to the burner cap body in a configuration in which the protrusion and the cylindrical portion are in contact with each other inside the cylindrical portion.

The manufacturing method of the burner cap, which is one aspect of the present disclosure, can employ a method that can fix the cover body to the burner cap body in a simpler configuration that is less likely to cause a loss of aesthetic appeal.

FIG. 1 is a perspective view that illustrates a schematic example of a gas stove according to a first embodiment of the present invention. FIG. 2 is a perspective view illustrating a gas burner used in the gas stove of FIG. FIG. 3 is a schematic cross-sectional view of the gas burner of FIG. FIG. 4 is a perspective view of a burner cap of a first embodiment used in the gas stove of FIG. FIG. 5 is a cross-sectional view that shows a schematic cross section passing through the central axis of the burner cap of the first embodiment. FIG. 6 is a plan view of the burner cap of the first embodiment. FIG. 7 is a cross-sectional view showing the AA section of FIG. FIG. 8 is a cross-sectional view that illustrates a cross section passing through the central axis of the burner cap body. FIG. 9 is a perspective view of the cover body as seen obliquely from above. FIG. 10 is a perspective view of the cover body as viewed obliquely from below. FIG. 11 is a cross-sectional view of the cover body. FIG. 12 is a perspective view that illustrates a schematic example of a gas stove according to a second embodiment of the present invention. FIG. 13 is a perspective view illustrating a gas burner used in the gas stove of FIG. FIG. 14 is a schematic cross-sectional view of the gas burner of FIG. FIG. 15 is a perspective view of a burner cap of a second embodiment used in the gas stove of FIG. FIG. 16 is a plan view of the burner cap of the second embodiment. Figure 17 (A) is an explanatory diagram illustrating the state after the first preparation process and the second preparation process when manufacturing a burner cap of the first embodiment, and Figure 17 (B) is an explanatory diagram illustrating the insertion process, which is part of the assembly process. Figure 18(A) is an explanatory diagram illustrating the process of inserting a jig into the cover body in the forming process, which is part of the assembly process, and Figure 18(B) is an explanatory diagram illustrating the process of forming a convex portion using the jig. FIG. 19 is a cross-sectional view of a burner cap according to another embodiment.

Below, embodiments of the present disclosure are listed and exemplified. Note that the features [1] to [7] exemplified below may be combined in any compatible combination.

[1] A method for manufacturing a burner cap including a burner cap body having a cylindrical portion and a flange portion extending from the cylindrical portion,
A manufacturing method in which a post-process is performed according to either a first method of attaching a cover body to the burner cap body or a second method of not attaching the cover body to the burner cap body,
When performing a post-process according to the first method, an assembly process is performed in which the cover body is assembled to the burner cap body,
When performing a post-process according to the second method, a surface treatment process is performed on at least the upper surface of the flange portion of the burner cap body,
the cover body is configured to be integral with an annular main body portion that covers the flange portion from above and a protrusion that protrudes downward from an inner edge portion of the main body portion,
A manufacturing method for a burner cap, wherein in the assembly process, the protrusion is inserted into the cylindrical portion, and the cover body is fixed to the burner cap main body in a configuration in which the protrusion and the cylindrical portion are in contact with each other within the cylindrical portion.

When the first method is adopted, the manufacturing method of the burner cap described in [1] can fix the cover body to the burner cap body in a simpler configuration that is less likely to cause a loss of aesthetics. On the other hand, when the second method is adopted, the burner cap can be constructed in a form that omits the cover body. Moreover, with this manufacturing method, the burner cap body that has a common basic structure can be used in both the first and second methods, making it possible to standardize parts.

[2] A method for manufacturing a burner cap including a burner cap body having a cylindrical portion and a flange portion extending from the cylindrical portion,
A body forming process which is a process of forming the burner cap body;
a cover body forming step for forming a cover body to be attached to the burner cap body;
an assembling step of assembling the cover body formed by the cover body forming step to the burner cap body;
Including,
In the cover body forming step, the cover body is formed by integrally providing an annular main body portion that covers the flange portion from above and a protrusion portion that protrudes downward from an inner edge portion of the main body portion,
A manufacturing method for a burner cap, wherein in the assembly process, the protrusion is inserted into the cylindrical portion, and the cover body is fixed to the burner cap main body in a configuration in which the protrusion and the cylindrical portion are in contact with each other within the cylindrical portion.

The manufacturing method of the burner cap described in [2] can fix the cover body to the burner cap body with a simpler configuration that is less likely to cause a loss of aesthetic appeal.

For example, the stove burner of Patent Document 1 has a plate-shaped portion of the cover body that covers the flange portion of the burner cap, and this plate-shaped portion is configured by integrally stacking an upper plate, which is the exposed portion, and a lower plate, which is the portion that engages with the flange portion. In such a configuration, in order to manufacture the cover body, it is necessary to fix the upper plate and the lower plate together, and welding is often used as a fixing method. However, when fixing the upper plate and the lower plate by welding, there is a concern that welding marks will remain in areas that are visible to the user (for example, the surface of the upper plate). If welding marks remain in areas that are visible to the user, it will affect the aesthetic appearance of the stove, so a separate process is required to remove the welding marks, which results in a more complicated manufacturing process and increased manufacturing costs. In contrast, when the first method is adopted in the manufacturing method [1] above, or when the manufacturing method [2] above is used, a protrusion is provided on the cover body so as to protrude downward from the inner edge of the main body, and this protrusion can be fixed by contacting the inner circumference of the tube portion. This means that the above-mentioned welding is not essential, and the problem of Patent Document 1 is unlikely to occur.

[3] The manufacturing method of the burner cap described in [1] or [2] above includes a cover body forming process, which is a process of forming the cover body. In the cover body forming process, the cover body is formed with a configuration in which the main body portion, the protrusion portion, and a second protrusion portion that protrudes downward from the outer edge portion of the main body portion and surrounds the protrusion portion in an annular shape are integrally provided.

The manufacturing method of the burner cap described in [3] can provide a second annular protrusion that protrudes downward from the outer edge of the main body, thereby preventing broth from entering between the main body of the cover body and the flange of the burner cap from the outside.

[4] In the manufacturing method of the burner cap described in [3] above, the assembly process is a process of assembling the cover body to the burner cap body so that the second protrusion is in contact with the flange portion.

The manufacturing method of the burner cap described in [4] can increase the stability of the cover body when placed on the burner, and can more effectively prevent the broth from entering from the outside.

[5] The manufacturing method of the burner cap described in any one of [1] to [4] above further includes a body forming step, which is a step of forming the burner cap body. When the assembly step is performed, the body forming step is performed before the assembly step, and a recess is formed in the inner peripheral part of the cylindrical part in the body forming step. In the assembly step, a part of the protrusion is hooked so as to enter the recess.

The manufacturing method of the burner cap described in [5] can fix the cover body with a simple structure in which the hook part is inserted into a recess formed on the inner circumference of the cylindrical part. If the hook part formed on the protrusion is inserted into a recess inside the cylindrical part and hooked, the fixing structure is less likely to affect the aesthetics of the exposed parts (especially the main body of the cover body).

[6] In the manufacturing method of the burner cap described in any one of [1] to [4] above, in the assembly process, the protrusion is pressed into the cylindrical portion and fixed to the cylindrical portion.

The manufacturing method of the burner cap described in [6] allows the cap to be fixed by press fitting, so the structure for fixing can be simplified and the parts involved in fixing are less likely to cause a loss of aesthetic appeal.

[7] A method for manufacturing a stove, comprising a step of attaching a burner cap manufactured by any one of the manufacturing methods described in [1] to [6] above to a stove body.

First Embodiment
A gas stove and a manufacturing method thereof according to a first embodiment will be described below.
1. Overview of the Gas Stove Fig. 1 illustrates a gas stove 1 of a first embodiment. Fig. 12 illustrates a gas stove 201 of a second embodiment. The first embodiment gas stove 1 and the second embodiment gas stove 201 differ only in the configuration of the burner cap, and the other configurations are the same. The first embodiment gas stove 1 and the second embodiment gas stove 201 share some of the manufacturing processes in common, specifically, the manufacturing processes other than the burner cap are common.

2. Overview of the Gas Stove of the First Embodiment The gas stove 1 shown in FIG. 1 corresponds to an example of a stove, and is configured as a built-in stove that is built into a cabinet (not shown in FIG. 1).

The gas stove 1 has a stove body 1A in which many parts are integrated. The stove body 1A has gas burners (stove burners) 4, 5, and 6, a housing 2, a top plate 3, etc.

In the following description, in the gas stove 1 shown in Figure 1, the first direction (in the example of Figure 1, the short direction when the top plate 3 is viewed in a plan view) of the plate-shaped top plate 3 (planar direction parallel to a specified flat surface that forms the upper surface of the top plate 3) is the front-rear direction. The second direction perpendicular to the first direction (in the example of Figure 1, the long direction when the top plate 3 is viewed in a plan view) is the left-right direction. Furthermore, the direction perpendicular to the front-rear direction and the left-right direction is the up-down direction. Note that in the example of Figure 1, the up-down direction is the plate thickness direction of the top plate 3.

The housing 2 is mainly made of, for example, a known metal material, forms the outer shell of the gas stove 1, and houses the gas burners 4, 5, 6 and other components. The housing 2 has a pair of side walls on both the left and right sides, and a rear wall (not shown in FIG. 1) is provided in a manner connected to the rear ends of the side walls. The front part (not shown in FIG. 1) of the housing 2 is configured in a frame or wall shape, and has, for example, a frame portion arranged in a manner spanning the pair of side walls. Furthermore, a bottom wall (not shown in FIG. 1) is connected to the lower parts of the front part, pair of side walls, and rear wall. The housing 2 has an internal space surrounded by the front part, pair of side walls, rear wall, and bottom wall, and has a box-like shape with an open top.

The top plate 3 is fixed to the upper end of the housing 2 and is arranged on the housing 2 in a configuration that partially blocks the opening at the upper end of the housing 2. The top plate 3 has a rectangular plate shape in a plan view and is configured to have multiple openings (through holes) 4A, 5A, 6A for exposing the gas burners 4, 5, 6.

The gas burners 4, 5, and 6 are provided to correspond to the openings 4A, 5A, and 6A formed in the top plate 3. Specifically, the gas burner (right burner) 4 is provided in a form inserted into the opening 4A formed in a position near the right end and the front end of the top plate 3. The gas burner (left burner) 5 is provided in a form inserted into the opening 5A formed in a position near the left end and the front end of the top plate 3. The gas burner (rear burner) 6 is provided in a form inserted into the opening 6A formed in the center rear side of the top plate 3. Furthermore, a grill section 8 is provided near the center of the housing 2. The grill section 8 includes a box-shaped grill chamber, a grill door 8A for opening and closing the grill chamber, and a grill burner (not shown in FIG. 1) that is configured as a gas burner and is arranged in the grill chamber.

As shown in FIG. 1, two ignition buttons 11, 14 (ignition operation section) are provided near the right end of the front of the housing 2, and two more ignition buttons 12, 13 are provided near the left end of the front of the housing 2. The ignition button 11 is an operation button for performing the ignition and extinguishing operation of the gas burner 4. The ignition button 12 is an operation button for performing the ignition and extinguishing operation of the gas burner 5. The ignition button 13 is an operation button for performing the ignition and extinguishing operation of the gas burner 6. The ignition button 14 is an operation button for performing the ignition and extinguishing operation of the gas burner of the grill section 8. Each ignition button 11, 12, 13, 14 is arranged in a configuration that is visible from the front side and can be operated from the front side. Each of the ignition buttons 11, 12, 13, and 14 is configured to be displaceable between a protruding position in which it protrudes forward and a retracted position in which it retreats rearward from the protruding position, and each of the ignition buttons 11, 12, 13, and 14 is also configured to be rotatable.

Burner caps 10 that form the heads of gas burners 4 and 5 are disposed in the multiple openings (through holes) 4A, 5A formed in the top plate 3. Similarly, burner cap 20 that forms the head of gas burner 6 is disposed in opening 6A. Burner caps 10 and 20 have the same configuration. Metal trivets 7 are provided on the top plate 3 to surround each of the burner caps 10, 20. Gas burners 4, 5 have substantially the same configuration as gas burner 6, except that they differ in size. Gas burner 6 will be described in detail below.

The gas burner 6 is provided with a mixture chamber (not shown) in which a throat portion for inhaling fuel gas and primary air is connected to mix the fuel gas and primary air, and the burner body 6B is connected in communication with the mixture chamber. The burner body 6B is provided with a gas flow path. As shown in Figs. 2 and 3, the burner cap 20 is placed on the burner body 6B. As shown in Fig. 2, the burner cap 20 is provided with a burner cap body 30 having a flame hole 33 formed on its outer periphery. The burner cap body 30 has a number of flame holes 33 formed on its outer periphery. As shown in Fig. 1, an ignition electrode 6C and a thermocouple (not shown) for flame detection are provided near any of the flame holes 33. The multiple flame holes 33 include a main flame hole 33a and a flame transfer hole 33b as shown in Fig. 4. The main flame hole 33a is a hole that forms a relatively large flame and is a flame hole for generating a main flame that contributes greatly to heating. In addition, between adjacent main flame holes 33a, a flame support hole, which is a groove smaller than the main flame hole 33a, is formed. The flame transfer hole 33b is a hole smaller than the main flame hole 33a, and has the function of transferring the flame generated in the main flame hole 33a on one side to the main flame hole 33a on the other side to continue the flame. In addition, although only some of the flame holes 33 are shown in Figs. 2 and 4, a large number of flame holes 33 are formed over the entire circumferential direction of the burner cap body 30. Furthermore, a temperature sensor 9 is arranged so as to penetrate the center of the burner body 6B and the burner cap 20. This temperature sensor 9 abuts against the bottom of a cooking utensil (such as a cooking pot) placed on the trivet 7 to detect the temperature of the bottom of the cooking utensil. In Fig. 3, components other than the temperature sensor 9 are shown in cross section, and the temperature sensor 9 is shown in a schematic side view. FIG. 3 is a schematic diagram of a cross section taken along a cutting plane passing through the main flame hole 33a and the central axis G.

When the ignition button 13 is operated to ignite, fuel gas is supplied to the burner body 6B together with primary air through the mixture chamber (not shown), and the mixture flows out from the numerous flame holes 33 of the burner cap 20 placed on the burner body 6B. Then, a controller (not shown) installed inside the stove body 1A sparks the electrodes 6C of the burner cap 20 to ignite the mixture, generating a flame around the burner cap 20. This allows the bottom of the cooking utensil placed on the trivet 7 around the burner cap 20 to be heated, making it possible to cook.

3. Burner Cap of the Gas Stove of the First Aspect The following description relates to the detailed configuration of the burner cap 20.
As shown in Figures 4 to 6, the burner cap 20 comprises an annular burner cap body 30 and a cover body 40 fixed to the burner cap body 30. The burner cap 20 is formed by assembling the burner cap body 30 and the cover body 40 together. The burner cap 20 is configured in an annular shape as a whole. The cover body 40 is disposed on the upper side of the burner cap 20. The cover body 40 is configured as a circular annular plate. The burner cap body 30 is disposed on the lower side of the burner cap 20. The burner cap body 30 is cylindrical.

The burner cap body 30 is attached to the burner body 6B from above. The burner cap body 30 is placed on the burner body 6B. The burner cap body 30 shown in FIG. 8 is made of a metal material such as aluminum die casting. The burner cap body 30 is located below the cover body 40. The cover body 40 is fixed to the burner cap body 30. The burner cap body 30 comprises a cylindrical tube portion 31 and a flange portion 32 that protrudes from the upper end side of the tube portion 31.

As shown in FIG. 8, the tubular portion 31 is configured in a cylindrical shape with the central axis G as the center of the cylinder, and extends along the central axis G. For example, the direction of the central axis G is the vertical direction. The inner peripheral surface of the tubular portion 31 is configured as a cylindrical surface centered on the central axis G or an annular surface along the cylindrical surface centered on the central axis G. The outer peripheral surface of the tubular portion 31 is also configured as a cylindrical surface centered on the central axis G or an annular surface along the cylindrical surface centered on the central axis G. The upper end of the tubular portion 31 forms the opening of the upper end of the burner cap 20. The lower end of the tubular portion 31 forms the opening of the lower end of the burner cap 20. The inner peripheral portion of the tubular portion 31 forms a hole portion continuing from the upper end to the lower end of the burner cap 20.

8, the flange portion 32 is configured as a portion that protrudes radially outward from a portion near the upper end of the tubular portion 31 around the central axis G. Specifically, the flange portion 32 is connected to the upper end of the tubular portion 31 and is configured as a portion that protrudes radially outward from the upper end around the central axis G. The flange portion 32 and the tubular portion 31 are integrally configured, for example, from the same metal material. The flange portion 32 has an upper surface portion 34. The upper surface portion 34 is a portion that constitutes the upper plate surface of the flange portion 32. A part of the upper surface portion 34 (a portion excluding a raised portion 35 described later) is disposed at a distance from the main body portion 41 of the cover body 40 and constitutes an annular opposing surface (upper surface) that faces the lower surface of the main body portion 41 at a distance. The upper surface portion 34 is in contact with a second protruding portion 43 of the cover body 40 described later. The surface (top surface) of the top surface portion 34 is an annular surface along a plane perpendicular to the central axis G.

8, a circular raised portion 35 is provided integrally with the upper surface portion 34 of the flange portion 32. The raised portion 35 constitutes the upper end portion of the tube portion 31. The raised portion 35 protrudes upward from the inner edge of the upper surface portion 34 of the flange portion 32. The upper surface of the raised portion 35 is an annular surface along a plane perpendicular to the central axis G. The upper surface 35a of the raised portion 35 is an annular surface along a plane perpendicular to the central axis G. The inner surface (side surface on the central axis G side) 35b of the raised portion 35 extends along the axial direction (up and down direction) of the central axis G. The upper end of the inner surface 35b is provided with an inclined portion 35c that slopes downward toward the central axis G. The outer surface (side surface opposite the central axis G) 35d of the raised portion 35 slopes downward toward the opposite side of the central axis G.

As shown in FIG. 8, a through hole 36 extending vertically is formed in the center of the burner cap body 30, allowing gas to pass vertically through the through hole 36.

As shown in FIG. 4, in the burner cap body 30, a large number of the above-mentioned flame holes 33 are formed on the underside of the flange portion 32 over the entire circumferential direction. In addition, most of the outer periphery of the flange portion 32 is circular in plan view, and an extension piece 38 is formed on part of the outer periphery, extending outward from the outer edge portion that is circular in plan view. This extension piece 38 is the portion that faces the electrode 6C shown in FIG. 1.

8, a recess 50 is provided on the inner peripheral portion 39 of the tube portion 31. The inner peripheral portion 39 is a portion that constitutes the cylindrical wall surface of the through hole 36. The recess 50 is a groove portion formed in the circumferential direction centered on the central axis G. The recess 50 is provided at a position near the upper end of the inner peripheral portion 39. The recess 50 is provided at a position that overlaps with the flange portion 32 in the horizontal direction (direction perpendicular to the central axis G). Specifically, the flange portion 32 is located in the region between the upper end and the lower end of the recess 50 in the vertical direction. The recess 50 is recessed radially outwardly centered on the central axis G. The recess 50 is continuously formed throughout the entire circumferential direction on the inner peripheral portion. The inner peripheral wall surface 50a in the recess 50 is an annular surface extending along the vertical direction (axial direction of the central axis G), specifically, a cylindrical surface centered on the central axis G. The inner peripheral wall surface 50a is also the inner peripheral surface of the portion of the recess 50 where the inner diameter is the largest. The lower wall surface 50b of the recess 50 is a tapered surface configured so that the inner diameter becomes smaller toward the lower side, and is an annular inclined surface that is reduced in diameter so as to approach the central axis G toward the lower side. The upper wall surface 50c of the recess 50 is an annular surface along a plane perpendicular to the central axis G. The upper wall surface 50c is connected to the inner surface 35b of the raised portion 35 so as to be perpendicular. The upper wall surface 50c of the recess 50 (the upper end of the recess 50) is located at a position equivalent to the upper surface of the flange portion 32 in the vertical direction or at a position higher than the upper surface. The recess 50 is located below the upper surface 35a of the raised portion 35. In the radial direction centered on the central axis G, the position of the inner peripheral wall surface 50a of the recess 50 is located inside the outer edge of the upper surface 35a.

The cover body 40 is made of metal (e.g., stainless steel). As shown in Figs. 9 to 11, the cover body 40 has a main body 41, a first protruding portion 42, and a second protruding portion 43. The main body 41 is configured as a circular annular plate that covers the flange portion 32 of the burner cap main body 30 from above. In the cover body 40, the main body 41, the first protruding portion 42, and the second protruding portion 43 are integrally formed of the same material. The first protruding portion 42 is configured to be bent from the main body 41 by, for example, metal processing (bending processing, etc.). The second protruding portion 43 is configured to be bent from the main body 41 by, for example, metal processing (bending processing, etc.). In this way, in the cover body 40, no joining such as welding is required between the main body 41 and the first protruding portion 42. Also, no joining such as welding is required between the main body 41 and the second protruding portion 43. The main body 41 has approximately the same shape as the circular portion of the flange 32. A bulge 41b is provided on the inner edge 41a side of the main body 41. The bulge 41b protrudes upward (in the opposite direction to the protruding direction of the first protrusion 42 and the second protrusion 43). The outer portion of the bulge 41b (the portion on the second protrusion 43 side) slopes downward toward the second protrusion 43 side.

As shown in FIG. 5, when the cover body 40 is fixed to the burner cap body 30, the raised portion 35 is inserted from below into the inside (lower side) of the bulging portion 41b of the main body 41. The upper surface 35a of the raised portion 35 is in contact with the lower surface of the bulging portion 41b of the main body 41.

The cover body 40 has been subjected to a surface treatment (e.g., barrel polishing) to give it a smooth and glossy structure. As shown in Figures 9 to 11, a through hole 44 of approximately the same diameter as the through hole 36 of the burner cap body 30 is formed in the center of the cover body 40, penetrating in the thickness direction of the main body 41. As shown in Figure 5, the through hole 44 is arranged in communication with the through hole 36 so as to continue above the internal space of the above-mentioned through hole 36.

The first protrusion 42 corresponds to an example of a protrusion. As shown in Figures 9 to 11, the first protrusion 42 protrudes downward from the inner edge 41a of the main body 41. The protruding length of the first protrusion 42 is greater than the protruding length of the second protrusion 43 described below. The first protrusion 42 is cylindrical with a central axis extending in the vertical direction (the axial direction of the central axis G when the cover body 40 is fixed to the burner cap main body 30). The first protrusion 42 is inserted into the tube portion 31 and fixed to the tube portion 31 while contacting the inner peripheral portion 39 of the tube portion 31.

As shown in FIG. 5, when the cover body 40 is fixed to the burner cap body 30, the first protrusion 42 has a hook portion 45 and an extension portion 46. The hook portion 45 constitutes the lower end portion of the first protrusion 42. The hook portion 45 is bent outward (in FIG. 5, radially outward from the center axis G) relative to the extension portion 46. The hook portion 45 enters the recess 50. The hook portion 45 is hooked on the recess 50 while entering the recess 50. The hook portion 45 is bent so as to incline from the lower end of the extension portion 46 toward the opposite side to the center axis G. The hook portion 45 is expanded so that its outer diameter is larger than that of the extension portion 46. The hook portion 45 is located below the upper wall surface 50c of the recess 50. Specifically, the portion that bends from the lower end of the extension 46 is expanded in diameter so as to enter the recess 50, and this expanded portion is positioned so as to hook onto the upper wall surface 50c or the inner end of the upper wall surface 50c.

As shown in FIG. 5, the extension portion 46 constitutes the upper end portion of the first protrusion 42. The extension portion 46 is a cylinder with a predetermined outer diameter. The extension portion 46 extends downward from the inner edge portion 41a of the main body portion 41. The extension portion 46 has a protruding length (vertical length) that is approximately the same as the protruding length (vertical length) of the raised portion 35. The extension portion 46 is cylindrical with a central axis extending in the vertical direction (axial direction of the central axis G). The extension portion 46 faces the inner surface 35b of the raised portion 35 from the inside (the central axis G side). The extension portion 46 may be in contact with the inner surface 35b of the raised portion 35 or may be spaced apart.

As shown in Figs. 5 and 7, the hook portion 45 has six protrusions 47. The protrusions 47 correspond to an example of a locking portion. The protrusions 47 are formed by pushing the lower end portion of the first protrusion 42 radially outward with, for example, a jig 70, as described below. The six protrusions 47 protrude radially from the center of the central axis G. The six protrusions 47 are arranged at equal intervals in the circumferential direction of the tube portion 31. The six protrusions 47 are arranged at equal angles of 60° around the central axis G. The protrusions 47 protrude diagonally downward (in a direction inclined with respect to the axial direction of the central axis G and in a direction away from the central axis G) from the lower edge of the extension portion 46. The protrusions 47 are in the shape of an arc along the circumferential direction of the tube portion 31. The six protrusions 47 enter the recess 50. The tip (lower end) of the protrusion 47 is in contact with the inner peripheral wall surface 50a of the recess 50. The protrusion 47 is caught in the recess 50 while inserted inside the recess 50. The protrusion 47 is located below the upper wall surface 50c of the recess 50.

As shown in Figs. 9 to 11, the second protrusion 43 protrudes downward from the outer edge 41c of the main body 41. The second protrusion 43 is annular. The second protrusion 43 surrounds the first protrusion 42 from the outside of the first protrusion 42 in an annular shape. As shown in Fig. 5, the second protrusion 43 contacts the flange 32 from the upper side. The protruding length (vertical length) of the second protrusion 43 is approximately the same as the protruding length (vertical length) of the extension 46. The second protrusion 43 surrounds the first protrusion 42 in an annular shape from the outside of the first protrusion 42. The second protrusion 43 is located slightly inside (towards the central axis G) the outer edge of the flange 32. The tip (lower end) of the second protrusion 43 contacts the outer edge of the upper surface 34 of the flange 32 from the upper side.

4. Overview of the gas stove of the second embodiment Fig. 12 illustrates a gas stove 201 of the second embodiment. The gas stove 201 differs from the gas stove 1 of the first embodiment (Fig. 1, etc.) only in that the burner caps 10 are changed to burner caps 210 and the burner cap 20 is changed to burner cap 220. The configuration of the gas stove 201 is the same as that of the gas stove 1 of the first embodiment (Fig. 1, etc.) except for the burner caps 210 and 220.

5. Burner Cap of the Gas Stove of the Second Embodiment The following description relates to the burner cap 220 constituting the gas stove 201 of the second embodiment. The burner cap 210 and the burner cap 220 have the same configuration.

As shown in Figures 13 to 16, the burner cap 220 has a configuration in which the cover body 40 is omitted from the burner cap 20 in the gas stove 1 of the first embodiment. That is, the burner cap 220 is composed of a burner cap body 30. The burner cap body 30 constituting the burner cap 220 may have a completely identical configuration to the burner cap body 30 of the gas stove 1, or may be slightly different. In the representative example below, in the burner cap body 30 constituting the burner cap 220, a surface treatment is applied to the surface (upper surface) of the upper surface portion 34 of the flange portion 32. The surface treatment is, for example, polishing.

The burner cap 220 is a burner cap that is attached from above to the burner body 6B (gas burner body) inside the gas stove 201. The burner cap body 30 that constitutes the burner cap 220 is used in both the first embodiment (first embodiment in which the cover body 40 is attached in a configuration that covers the flange portion 32) and the second embodiment (second embodiment in which the cover body 40 is not attached). The burner cap body 30 of the burner cap 220 has a cylindrical portion 31 and a flange portion 32 that protrudes from the cylindrical portion 31.

As described above, an annular raised portion 35 is formed on the upper surface 34 of the flange portion 32. The raised portion 35 is raised with its upper end positioned above the outer edge of the flange portion 32. The raised portion 35 functions as a support portion that supports the cover body 40 from below when the burner cap body 30 is used in the first mode. The raised portion 35 functions as a dam that blocks liquid from flowing along the upper surface of the flange portion 32 toward the tube portion 31 when the burner cap body 30 is used in the second mode.

6. Overview of Manufacturing Method and Common Steps The following description relates to the manufacturing steps for the burner caps 20,220.
The burner cap 20 is manufactured by a first method in which the cover body 40 is attached to the burner cap main body 30. The burner cap 220 is manufactured by a second method in which the cover body 40 is not attached to the burner cap main body 30. In the method of manufacturing the burner caps 20 and 220, a post-process is performed according to either the first method or the second method.

When manufacturing the burner caps 20, 220, a decision process is carried out to determine which of the burner caps 20, 220 to manufacture. Which of the burner caps 20, 220 to manufacture may be determined manually by an operator in a prior manufacturing plan, for example, or may be determined by automatic control. The decision process may be carried out before the first preparation process described below, after the first preparation process, or at the same time as the first preparation process.

When manufacturing the burner cap 20, 220, in addition to the above-mentioned determination step, a first preparation step is performed to prepare the burner cap body 30. The first preparation step corresponds to an example of a body forming step. In the first preparation step, the burner cap body 30 is formed. In the first preparation step, the burner cap body 30 is produced, for example, by pressing molten metal (e.g., aluminum or aluminum alloy) into a die and molding (casting). In the burner cap body 30, the inner surface of the cylindrical portion 31 before forming the recess 50 may be an inner surface with a constant inner diameter, or may have a slightly tapered surface. The recess 50 is formed by performing cutting processing on the upper end side of the inner surface of the cylindrical portion 31 after forming the inner surface of the cylindrical portion 31. The method described here is merely an example, and any known metal processing method may be used as long as it is a method that can form the burner cap body 30 (see FIG. 8) having the above-mentioned shape. In this way, the determination step and the first preparation step are performed as a common step.

7. Processes for manufacturing the burner cap 20 of the first embodiment When manufacturing the burner cap 20 of the burner caps 20 and 220, in addition to the above-mentioned determination process and first preparation process, a second preparation process and an assembly process are performed. That is, the second preparation process and the assembly process are post-processes according to the first method, and specifically, they are processes that are essential when manufacturing the burner cap 20 by the first method.

The second preparation step is a step of preparing the cover body 40. The second preparation step corresponds to an example of a cover body forming step. In the second preparation step, the cover body 40 (see Figures 10 and 11) having the above-mentioned shape is formed by metal processing. Specifically, the cover body 40 is formed so that the annular main body portion 41 covering the flange portion 32 from above, the first protrusion portion 42 protruding downward from the inner edge portion of the main body portion 41, and the second protrusion portion 43 protruding downward from the outer edge portion of the main body portion 41 are integrally provided. In the second preparation step, for example, the cover body 40 is formed by processing a stainless steel plate material. Note that the cover body 40 having the above-mentioned shape (see Figures 10 and 11) may be formed by any known metal processing method as long as it is a method capable of forming the cover body 40. The cover body 40 shown in Figures 10, 11, and 17(A) is the cover body 40 before the protrusion 47 is formed, and in the second preparation step, the "cover body 40 before the protrusion 47 is formed" is formed. In the "cover body 40 before the protrusion 47 is formed," the first protrusion 42 is configured as a cylindrical portion that continues from the base end to the tip end with a constant inner diameter and a constant outer diameter.

When manufacturing the burner cap 20 of the first embodiment, an assembly process is performed after the first preparation process and the second preparation process to assemble the cover body 40 to the burner cap body 30. In this process, the cover body 40 (cover body 40 before forming the convex portion 47) and the burner cap body 30 prepared as shown in FIG. 17(A) are assembled to each other. In the assembly process, first, as shown in the solid line portion shown in FIG. 17(B), an insertion process is performed to insert the first protrusion 42 (first protrusion 42 before forming the convex portion 47) in the cover body 40 before forming the convex portion 47 into the tube portion 31 (through hole 36) of the burner cap body 30 from the upper end side of the burner cap body 30 (from the flange portion 32 side).

17B, in the insertion step, the first protrusion 42 is inserted into the tubular portion 31 (through hole 36) so that the upper surface 35a of the raised portion 35 contacts the lower surface of the bulging portion 41b of the main body portion 41. That is, the cover body 40 (the cover body 40 before forming the convex portion 47) is arranged relative to the burner cap main body 30 in a configuration in which the raised portion 35 is arranged to support the inner edge portion of the cover body 40 from below. More specifically, in the insertion step, the tip (lower end) of the second protrusion 43 contacts the outer edge portion of the upper surface portion 34 of the flange portion 32 from above, and the first protrusion 42 is inserted into the tubular portion 31 (through hole 36) so that a part of the base end side (upper end side) of the first protrusion 42 fits into the inner surface 35b of the raised portion 35 (the surface constituting the inner periphery 39 of the tubular portion 31) from the inside (the central axis G side). After being inserted by the insertion process, the tip of the first protrusion 42 is in a position overlapping with the recess 50 in the horizontal direction (direction perpendicular to the central axis G) (slightly above the vertical center of the recess 50). That is, in the state of FIG. 17(B) after being inserted by the insertion process, the tip of the first protrusion 42 is below the upper end of the recess 50 and above the lower end of the recess 50.

In the assembly process, after the above-mentioned insertion process, a forming process is performed to form the convex portion 47 as shown in FIG. 18 from the state shown in FIG. 17(B). In the forming process to form the convex portion 47, the first protrusion 42 inserted as shown in FIG. 17(B) is deformed by a jig 70 to form the convex portion 47 so as to protrude outward. The jig 70 is configured as a known diameter expansion jig. As shown in FIG. 18(A), the jig 70 has, for example, six divided pieces 71. The cross section of the divided pieces 71 (cross section seen from the axial direction of the central axis G) is fan-shaped. The cross-sectional shape of each divided piece 71 is the same. The six divided pieces 71 arranged in a circle form a pressing portion 72. The multiple divided pieces 71 shown in FIG. 18 can be displaced so as to switch between a reduced diameter state approaching the central axis G as shown in FIG. 18(A) and an expanded diameter state moving away from the central axis G so that the distance from the central axis G becomes larger than in the first state as shown in FIG. 18(B). In FIG. 18, the guide portion for displacing the plurality of split pieces 71 in this manner is omitted. The plurality of split pieces 71 are configured so that the diameter of the outer edge in the expanded diameter state as shown in FIG. 18(B) is larger than the diameter of the outer edge in the contracted diameter state as shown in FIG. 18(A). In the example of FIG. 18(A), the six split pieces 71 are combined into a cylindrical shape in the contracted diameter state. In the example of FIG. 18(B), the six split pieces 71 are divided in the circumferential direction in the expanded diameter state. Specifically, in the contracted diameter state as shown in FIG. 18(A), the plurality of split pieces 71 are formed into a disk shape and a cylindrical shape, and the inner periphery is formed as a hole with a predetermined inner diameter. Then, the shaft member 73 is arranged so as to be inserted into the inner periphery (hole) of the plurality of split pieces 71. The shaft member 73 is configured in a rod-like and cylindrical shape, and has a small diameter portion that is inserted into a hole formed in the inner periphery of the multiple divided pieces 71 when in the diameter-reduced state as shown in FIG. 18(A), and a large diameter portion with an outer diameter larger than that of the hole. The outer diameter of the small diameter portion of the shaft member 73 is approximately the same as the inner diameter of the inner periphery (hole) of the multiple divided pieces 71 when in the diameter-reduced state, and as shown by the two-dot chain line in FIG. 17(B), the small diameter portion of the shaft member 73 can be inserted into the inner periphery (hole) when in the diameter-reduced state. On the other hand, the large diameter portion of the shaft member 73 is configured to continue to the small diameter portion, and has a tapered portion whose outer diameter increases as it moves away from the small diameter portion. As shown by the two-dot chain line in FIG. 17(B), when the small diameter portion of the shaft member 73 is inserted into the inner periphery (hole) when in the diameter-reduced state, the multiple divided pieces 71 maintain the diameter-reduced state. Then, when the shaft member 73 is displaced in its own axial direction from this state and the large diameter portion (tapered portion) is pushed inside the multiple segments 71, the multiple segments 71 are displaced in a direction away from the central axis G as shown in FIG. 18(B) and change to the expanded diameter state. From a state in which the multiple segments 71 are arranged inside the tip of the first protrusion 42 in a reduced diameter state as shown by the two-dot chain line in FIG. 17(B) and FIG. 18(A), the multiple segments 71 are pushed inside the multiple segments 71 as shown in FIG. 18(B) and change to an expanded diameter state, so that the multiple segments 71 expand radially and the protrusion 47 is formed in a configuration in which the tip of the first protrusion 42 is expanded.

In the forming process of the protrusion 47, the jig 70 is inserted into the through hole 44 of the cover body 40 after the process of assembling the cover body 40 to the burner cap body 30, with the multiple divided pieces 71 arranged inside as shown by the two-dot chain line in FIG. 17 (B). More specifically, the pressing portion 72 and the recess 50 are arranged in a state where they overlap in the horizontal direction (direction perpendicular to the central axis G) so that the recess 50 is arranged outside the pressing portion 72 (multiple divided pieces 71). The outer diameter of the pressing portion 72 is slightly smaller than the inner diameter of the first protrusion 42 before the formation of the protrusion 47 when in a reduced diameter state (combined state), and is larger than the inner diameter of the first protrusion 42 before the formation of the protrusion 47 when in an expanded diameter state (divided state). As shown in FIG. 18B, the pressing portion 72 (multiple divided pieces 71) presses the inner surface near the tip of the first protrusion 42 radially outward as the diameter-reduced state (combined state) changes to the diameter-enlarged state (divided state). When such pressing is performed, as shown in FIG. 5, multiple points (e.g., six points) of the tip of the first protrusion 42 protrude obliquely downward (in a direction inclined with respect to the axial direction of the central axis G and in a direction away from the central axis G). This forms the hook portion 45 and the extension portion 46 having six protrusions 47. The six protrusions 47 enter the recess 50. The tips (lower ends) of the protrusions 47 come into contact with the inner peripheral wall surface 50a of the recess 50. The protrusions 47 are hooked on the recess 50 while entering the recess 50. In this way, in the forming process, the raised portion 35 contacts the vicinity of the inner edge of the main body 41 of the cover body 40 from below, while the raised portion 35 (support portion) supports the vicinity of the inner edge, and the convex portion 47 is crimped to enter the concave portion 50 (specifically, crimped to push the convex portion 47 into the concave portion 50 (groove portion)). As a result, the first protrusion 42 is inserted into the cylindrical portion 31 and fixed to the cylindrical portion 31 while contacting the inner peripheral portion 39 of the cylindrical portion 31. In this way, the burner cap 20 of the first embodiment is manufactured. Note that, although an example of a method for forming the convex portion 47 is shown in FIG. 17(B) and FIG. 18, any enlargement direction may be used and any enlargement tool may be used as long as the method can form the convex portion by pushing the first protrusion 42 from the inside in a direction away from the central axis G at multiple circumferential portions or the entire circumferential direction.

8. Processes relating to the manufacture of the burner cap 220 of the second embodiment When manufacturing the burner cap 220 out of the burner caps 20 and 220, in addition to the above-mentioned determination process and first preparation process, a surface treatment process is performed. That is, the surface treatment process is a post-process according to the second method. The surface treatment process is a process of performing a surface treatment on at least the upper surface of the flange portion 32 of the burner cap body 30. Specifically, in the surface treatment process, the upper surface of the flange portion 32 is polished. Note that in the surface treatment process, exposed parts other than the upper surface of the flange portion 32 may be polished. In the surface treatment process, various known polishing processes such as barrel polishing, buff polishing, and lapping polishing may be used.

When the first method is adopted, the manufacturing method of the burner caps 20, 220 described above can fix the cover body 40 to the burner cap main body 30 in a simpler configuration that is less likely to cause a loss of aesthetics. On the other hand, when the second method is adopted, the burner cap 220 can be constructed in a form that omits the cover body 40. Moreover, with this manufacturing method, the burner cap main body 30, which has a common basic structure, can be used in both the first and second methods, making it possible to standardize parts.

When the first method is adopted, the cover body 40 can be fixed to the burner cap main body 30 with a simpler configuration that is less likely to cause a loss of aesthetic appeal. Specifically, a protrusion (first protrusion) is provided on the cover body 40 so as to protrude downward from the inner edge 41a of the main body 41, and this protrusion can be fixed by contacting the inner periphery of the tubular portion, so that the cover body can be fixed to the burner cap without requiring the above-mentioned welding.

When the first method is adopted, a second annular protrusion can be provided that protrudes downward from the outer edge of the main body, thereby preventing broth from entering between the main body of the cover body 40 and the flange of the burner cap body from the outside.

When the first method is adopted, the cover body can be attached to the burner cap body so that the second protrusion is in contact with the flange portion, which increases the stability of the cover body and more effectively prevents broth from entering from the outside.

When the first method is adopted, the cover body can be fixed with a simple configuration in which the hook portion fits into a recess formed on the inner circumference of the tubular portion. If the hook portion formed on the protrusion fits into a recess inside the tubular portion and hooks onto it, the fixing configuration is less likely to affect the aesthetics of the exposed area (especially the main body of the cover body).

<Other embodiments>
The present invention is not limited to the embodiments described above and in the drawings. For example, the features of the above or later described embodiments can be combined in any combination within a range that does not contradict. Furthermore, any feature of the above or later described embodiments can be omitted unless it is clearly stated as essential. Furthermore, the above described embodiments may be modified as follows.

In the above description of the embodiment, a gas stove 1 configured as a built-in stove is given as an example of a stove, but the stove may be other types of stoves, such as a tabletop stove.

In the above embodiment, the hook portion 45 has six protrusions 47, but other shapes are also acceptable as long as the hook portion 45 is configured to hook into the recess 50 of the burner cap body 30. For example, as shown in FIG. 19, the hook portion 45 may have an annular protrusion 247. The protrusion 247 protrudes outward (opposite the central axis G) from the extension portion 46. The entire circumferential direction of the protrusion 247 is inserted into the recess 50. The tip (lower end) of the protrusion 247 may or may not be in contact with the inner peripheral wall surface 50a of the recess 50.

In the above embodiment, the first protrusion 42 may be configured to be fixed to the tubular portion 31 in a state where it is pressed into the tubular portion 31. For example, the first protrusion 42 without the hook portion 45 (cylindrical with a uniform diameter over the entire axial direction) may be configured to be pressed into the tubular portion 31 without the recess 50. In this case, the outer diameter of the first protrusion 42 is the same as or slightly larger than the inner diameter of the tubular portion 31. Also, for example, the first protrusion 42 may be configured to be provided with an elastic deformation portion (such as a leaf spring that can elastically deform in the radial direction). The elastic deformation portion that is elastically deformed at the start of insertion into the tubular portion 31 may elastically return to its original state and enter the recess 50 to be caught. Since these gas burners 6 can be fixed by press-fitting, the structure for fixing can be simplified, and the part involved in fixing is less likely to cause a deterioration in aesthetics.

In the above embodiment, the hook portion 45 is formed after the first protrusion 42 is inserted into the tubular portion 31 (through hole 36), but the first protrusion 42 may be provided in advance with a configuration for hooking onto the inner periphery 39. For example, the first protrusion 42 inserted into the tubular portion 31 (through hole 36) may be rotated to hook onto the inner periphery 39. As an example, a locking portion (e.g., an L-shaped hook portion that protrudes outward) may be formed on the outer periphery of the first protrusion 42, and a locked portion that hooks onto the locking portion may be formed on the inner periphery 39. The first protrusion 42 may then be inserted into the tube 31 so that the locked portion in the tube 31 and the locking portion of the first protrusion 42 do not interfere with each other. The first protrusion 42 may then be rotated relative to the tube 31 so that the locking portion and the locked portion hook together, and the first protrusion 42 may be fixed so that it does not come off the tube 31.

In the above embodiment, the first protrusion 42 is provided with a convex portion 47, and the tubular portion 31 is provided with a concave portion 50, but the first protrusion 42 may be provided with a concave portion, and the tubular portion 31 may be provided with a convex portion.

In the above embodiment, the protrusion 47 contacts the inner peripheral wall surface 50a of the recess 50, but it does not have to be in contact. For example, the corner between the hook portion 45 and the extension portion 46 may be in contact with the upper end of the recess 50 (the corner between the upper wall surface 50c of the recess 50 and the inner surface 35b of the raised portion 35).

In the above embodiment, the first protrusion 42 is cylindrical, but it does not have to be cylindrical. For example, it may be configured so that only the portion that hooks onto the inner periphery 39 of the tube portion 31 protrudes.

In the above embodiment, the second protrusion 43 is cylindrical, but it does not have to be cylindrical. For example, the second protrusion may be configured to protrude downward from a portion of the outer edge of the main body 41.

In the above embodiment, the first protrusion 42 is configured to have six protrusions 47, but a number of protrusions other than six may be provided. In this case, the jig 70 only needs to have a number of divided pieces 71 that matches the number of protrusions.

In the above embodiment, the cover body 40 has the second protrusion 43, but the cover body 40 does not have to have the second protrusion 43.

In the above embodiment, the second protrusion 43 contacts the upper surface 34 of the flange portion 32, but it may be configured not to contact.

In the above embodiment, a configuration in which the burner cap body 30 is provided with a flame hole 33 is exemplified, but a configuration in which the flame hole is formed by a part of the burner cap body 30 and a part of the burner body 6B may also be used.

In the above embodiment, polishing is given as an example of a surface treatment process, but a process other than polishing may also be used. For example, the process may involve plating, painting, anodizing, or other treatment on the upper surface 34 of the flange portion 32.

The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is not limited to the embodiments disclosed herein, but is intended to include all modifications within the scope of the claims or within the scope equivalent to the claims.

1,201...Gas stove 4, 5, 6...Gas burner (stove burner)
6B... Burner body 10, 20, 210, 220... Burner cap 30... Burner cap body 31... Cylindrical portion 32... Flange portion 33... Flame hole 34... Upper surface portion 39... Inner peripheral portion 40... Cover body 41... Main body portion 41a... Inner edge portion 41c... Outer edge portion 42... First protrusion (protrusion)
43: Second protruding portion 45: Hook portion 46: Extension portion 47, 247: Convex portion (locking portion)
50...Recess

Claims (5)

A manufacturing method for manufacturing a burner cap including a burner cap body having a cylindrical portion and a flange portion extending from the cylindrical portion,
A manufacturing method in which a post-process is performed according to either a first method of attaching a cover body to the burner cap body or a second method of not attaching the cover body to the burner cap body,
When performing a post-process according to the first method, an assembly process is performed in which the cover body is assembled to the burner cap body,
When performing a post-process according to the second method, a surface treatment process is performed on at least the upper surface of the flange portion of the burner cap body,
the cover body is configured to be integral with an annular main body portion that covers the flange portion from above and a protrusion that protrudes downward from an inner edge portion of the main body portion,
A manufacturing method for a burner cap, wherein in the assembly process, the protrusion is inserted into the cylindrical portion, and the cover body is fixed to the burner cap main body in a configuration in which the protrusion and the cylindrical portion are in contact within the cylindrical portion. A manufacturing method for manufacturing a burner cap including a burner cap body having a cylindrical portion and a flange portion extending from the cylindrical portion,
A body forming process which is a process of forming the burner cap body;
a cover body forming step for forming a cover body to be attached to the burner cap body;
an assembling step of assembling the cover body formed by the cover body forming step to the burner cap body;
Including,
In the cover body forming step, the cover body is formed by integrally providing an annular main body portion that covers the flange portion from above and a protrusion portion that protrudes downward from an inner edge portion of the main body portion,
A manufacturing method for a burner cap, wherein in the assembly process, the protrusion is inserted into the cylindrical portion, and the cover body is fixed to the burner cap main body in a configuration in which the protrusion and the cylindrical portion are in contact with each other within the cylindrical portion. A cover body forming step is a step of forming the cover body,
A manufacturing method for a burner cap as described in claim 1 or claim 2, wherein in the cover body forming process, the cover body is formed in a configuration in which the main body portion, the protrusion portion, and a second protrusion portion protruding downward from the outer edge portion of the main body portion and surrounding the protrusion portion in a ring shape are integrally formed. The method for manufacturing a burner cap according to claim 3 , wherein the assembling step is a step of assembling the cover body to the burner cap main body so that the second protrusion is in contact with the flange portion. A body forming step is a step of forming the burner cap body,
When the assembling step is performed, the main body forming step is performed before the assembling step, and a recess is formed in an inner peripheral portion of the cylindrical portion in the main body forming step.
The method for manufacturing a burner cap according to any one of claims 1 to 4, wherein in the assembling step, a part of the protrusion is hooked so as to enter into the recess.

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