Combustion furnace

Abstract

To provide a combustion furnace in which a body having a combustion chamber and an ash receiving box are mutually fixed with no gap therebetween.SOLUTION: A combustion furnace 1 includes: a body 10 having a combustion chamber 15 for burning a solid fuel 5 therein; an upward-opening ash receiving box 30 stored below the body 10 in a communication state with the combustion chamber 15, and having a peripheral wall 32 and a bottom part 31; and a storage support part 40 supporting the ash receiving box 30 stored below the body 10. In a state of being stored below the body 10, the bottom part 31 of the ash receiving box 30 is pressed by the storage support part 40 to be lifted, such that an upper end face 32a of the peripheral wall 32 comes into press-contact with a lower face 10e of the body 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a combustion furnace that uses solid fuel such as charcoal or firewood. [Background technology]

[0002] Various conventional combustion furnaces of this type have been proposed, which have a main body with a combustion chamber at the top and an ash receiving box at the bottom that receives and collects ash that falls from the combustion chamber (see, for example, Patent Document 1).

[0003] In this type of combustion furnace, to allow for easy disposal of ash, a separate ash receiving box is usually placed below the main body, or, as in Patent Document 1, a separate tray-shaped ash receiving box is used as a drawer that can be easily inserted and removed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-283463 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional combustion furnaces of this type do not have a means for tightly fastening the separate ash receiving box to the main body. This means that the ash receiving box can be removed or pulled out even while solid fuel is burning. Therefore, if the ash receiving box is operated incorrectly, there is a risk that it will not be able to receive the ash.

[0006] Furthermore, in the case of an ash receiving box that is separate from the main body and can be freely inserted and removed, even if the ash receiving box is not moved during combustion, if there is a gap between the main body and the ash receiving box, ash falling from the combustion chamber may fly out through the gap and contaminate the area around the combustion furnace.

[0007] Furthermore, in the case of a portable combustion furnace such as a barbecue set, if the ash receiving box is designed to be freely inserted and removed from the main body, there is the problem that it is difficult to move the main body and ash receiving box as a unit.

[0008] The present invention has been proposed in consideration of the above circumstances, and its purpose is to provide a combustion furnace in which the main body having the combustion chamber and the ash receiving box can be fixed to each other without any gaps. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the combustion furnace of the present invention comprises a main body having a combustion chamber inside for burning solid fuel, an ash receiving box having a peripheral wall and a bottom and opening upward, which is stored below the main body so as to be in communication with the combustion chamber, a storage support part that supports the ash receiving box stored below the main body, and an operating part that can freely switch between fixing and releasing the ash receiving box to the main body, wherein the storage support part has a support rod that is rotatably supported by the operating part, and a protrusion that protrudes in one direction in the circumferential direction is provided at the middle part of the longitudinal direction of the support rod, and the ash receiving box is stored below the main body, and the operating part rotates the protrusion to a position where it presses against the bottom of the ash receiving box, thereby lifting the bottom, and the upper end surface of the peripheral wall is pressed against the underside of the main body, fixing it to the main body. [Effects of the Invention]

[0010] Since the combustion furnace of the present invention has the above-described configuration, the main body having the combustion chamber and the ash receiving box can be fixed to each other without any gaps. [Brief explanation of the drawings]

[0011] [Figure 1] 1A is a perspective view of a combustion furnace according to an embodiment of the present invention, FIG. 1B is a perspective view of an ash receiving box, and FIG. 1C is a perspective view of the combustion furnace with the ash receiving box released from the main body. [Figure 2](a) is a front view of the combustion furnace with the ash receiving box in the unlocked state, and (b) and (c) are side views showing the procedure for installing the ash receiving box. [Figure 3] (a) is a front view of a combustion furnace with the ash receiving box fixed, (b) is a side view of the same, and (c) is a front view showing another embodiment of a combustion furnace with the ash receiving box fixed. [Figure 4] (a) is a plan view of the combustion furnace, (b) is a plan view of the combustion furnace with a charcoal holder installed, and (c) is a cross-sectional view taken along line XX in (b). DETAILED DESCRIPTION OF THE INVENTION

[0012] A combustion furnace 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. First, a general basic configuration common to the combustion furnace 1 according to the various embodiments described below will be described.

[0013] The combustion furnace 1 comprises a main body 10 having a combustion chamber 15 therein for burning solid fuel 5, an ash receiving box 30 having a peripheral wall 32 and a bottom 31 and opening upward, which is stored below the main body 10 so as to be in communication with the combustion chamber 15, and a storage support part 40 which supports the ash receiving box 30 stored below the main body 10.

[0014] When the ash receiving box 30 is stored below the main body 10, the bottom 31 is pressed and lifted by the storage support part 40, and the upper end surface 32a of the peripheral wall 32 can be pressed against the lower surface 10e of the main body 10.

[0015] Next, the details of the combustion furnace 1 will be explained using the example of a barbecue stove shown in Figures 1 to 4. In this specification and claims, the combustion furnace 1 and each of its constituent parts will be explained by defining directions such as up and down, front and back, based on the perspective view of Figure 1(a).

[0016] The combustion furnace 1 shown in Figures 1 to 4 has a configuration that further includes an operating unit 46 in addition to the above-mentioned general basic configuration, and is configured so that the ash receiving box 30 can be fixed to or released from the main body 10 by operating the operating unit 46.

[0017] The main body 10 is a box-shaped body made of metal (steel, stainless steel, etc.) with openings at the top and bottom. That is, the outer casing of the main body 10 is formed by a front plate portion 10a, a back plate portion 10b, left and right side plate portions 10c, and a bottom plate portion 10d, and has an upper opening 11, and a lower opening 12 formed in the center of the bottom plate portion 10d (see FIG. 4(a)).

[0018] The main body 10 has a combustion chamber 15 therein. Heat-resistant bricks 19 are arranged on the inner periphery of the main body 10 in the combustion chamber 15, and solid fuel 5 (see FIG. 4(c)) is burned inside the heat-resistant bricks 19 (see FIG. 1(a)).

[0019] The heat-resistant bricks 19 are placed on the bottom plate portion 10d, and the solid fuel 5 is placed in the space surrounded by the heat-resistant bricks 19. An iron plate (not shown) or a grill (not shown) is placed on the heat-resistant bricks 19 so as to cover the upper opening 11 from above, making it possible to grill yakitori or barbecue over charcoal.

[0020] Two rods 13 are arranged on the left and right sides of the rear side of the bottom plate 10d so as to protrude downward (see FIG. 3(b)). These rods 13 serve as stoppers when inserting the ash box 30. The protrusion of the rods 13 can be adjusted by threading a headless bolt with a nut on the inside bottom surface of the main body 10.

[0021] The storage support section 40 comprises a frame plate section 41 formed by processing a strip into an inverted U-shape when viewed from the front, and a support rod 45 for supporting the ash receiving box 30 from below, and is provided with an operating section 46 for operating the support rod 45 (see Figure 1(a)).

[0022] The frame plate portion 41 is disposed below the bottom plate portion 10d of the main body 10 so as to be suspended from the inside of each of both side plate portions 10c of the main body 10 on the bottom plate portion 10d. The frame plate portion 41 is made up of two suspension plate portions 42 and a bridging plate portion 43 connecting their lower ends, and the upper end portion 42b of the suspension plate portion 42 is fixed to the bottom plate portion 10d of the box-shaped body.

[0023] Furthermore, round holes 42a are formed at the lower end of the hanging plate portion 42, i.e., near the bend between the hanging plate portion 42 and the bridging plate portion 43, and a metal support rod 45 is inserted into both round holes 42a and attached so as to be disposed above the bridging plate portion 43. This support rod 45 is a cylindrical rod that is allowed to rotate. To enable the support rod 45 to rotate, the round holes 42a of the two hanging plate portions 42 form bearing portions for the support rod 45. In other words, the frame plate portion 41 forms a bearing frame.

[0024] An operating part 46, which is a rotating lever for rotating the support rod 45, is bent and connected to one end of the support rod 45 in the longitudinal direction. The support rod 45 also has a protrusion 45a at the middle part in the longitudinal direction (approximately the center in this example) that protrudes to one side in the radial direction of the shaft. By operating the operating part 46, the protrusion 45a can be rotated back and forth between a state in which it is facing upward (the state shown in FIG. 1(a)) and a state in which it is facing sideways.

[0025] In the illustrated example, the protrusion 45a is formed by bending the support rod 45, but it may be formed in any manner as long as it protrudes to one radial direction of the support rod 45. For example, the protrusion 45a may be formed by integrating a separate member with the unbent support rod 45 by welding or the like.

[0026] As will be described later, the ash box 30 is supported from below by the protrusions 45a of the support rods 45, so the bridging plate 43 disposed below the support rods 45 is not an essential component, and the frame plate 41 may not have the bridging plate 43. Of course, it is desirable to include the bridging plate 43 to make the frame plate 41 more sturdy.

[0027] The main body 10 further has four legs 21 fixed near the corners of the outer surface of the bottom plate 10d. The four legs 21 support the main body 10 from below and also ensure space for arranging the storage support part 40 and the ash receiving box 30. Note that the legs 21 are not shown in Figures 2 to 7.

[0028] As described above, the ash receiving box 30 has four peripheral walls 32 and a bottom 31, and is open at the top so that it can receive ash 3 generated by the combustion of solid fuel 5 such as charcoal in the combustion chamber 15 of the main body 10. In addition, a ventilation window 33 that can be opened and closed is provided in the front wall 32b of the peripheral walls 32 (see FIG. 1(b)). A handle 34 provided on the ventilation window 33 is used to take the ash receiving box 30 in and out, and to slide the ventilation window 33.

[0029] FIG. 1(c) and FIGS. 3(a) to 3(c) show a fixed state in which the ash receiving box 30 is arranged in the space below the main body 10 and the movement of the ash receiving box 30 is locked.

[0030] In this fixed state, the rotating lever is in an upright position in the same vertical direction as the hanging plate portion 42, and in this state the tip of the protrusion 45a of the support rod 45 faces upward and presses against the bottom 31 of the ash receiving box 30, causing the upper end surface 32a of the peripheral wall 32 of the ash receiving box 30 to be pressed against the underside 10e of the main body 10.

[0031] In addition, reference numeral 42c in Figures 1(a), 2(a), etc. denotes a lever stopper that prevents the rotating lever from rotating too far backward, that is, that prevents the protrusion 45a from falling backward.

[0032] In the fixed state, the main body 10 and the ash receiving box 30 are internally connected by the lower opening 12 of the main body 10 (see FIG. 4) and the opening of the ash receiving box 30, while externally, as shown in FIG. 3(a), no gap 7 is formed between the main body 10 and the upper end of the ash receiving box 30. Furthermore, if a conventionally well-known rail structure that can be retracted forward and backward is applied to the ash receiving box, precision is required to ensure that the rail and the box slide smoothly, and applying it to a main body 10 made of metal would be costly. Furthermore, simply adopting a rail structure alone does not result in a structure that does not form the gap 7. With the above-described configuration, even if it is made of metal, the main body 10 and the ash receiving box 30 can be fixed to each other without any gap 7, despite the simple structure, and the ash receiving box 30 can be easily retracted to dispose of the ash.

[0033] In this way, the following procedure can be carried out to fix the main body 10 and the ash receiving box 30 together. The procedure will be described with reference to Figures 2(a) to 2(c).

[0034] First, the rotating lever (operating part 46) is placed approximately parallel to the bottom surface of the main body 10, with the protrusion 45a of the support rod 45 facing sideways (laying it down). Then, insert the ash box 30 from the front toward the opening surrounded by the frame plate part 41 until it hits the rod-shaped body 13 (stopper) (see Figures 2(a) and 2(b)).

[0035] In this state, the ash receiving box 30 is located below the main body 10, but can be freely moved in and out by sliding. This state is the unlocked state, and a gap 7 is formed between the main body 10 and the ash receiving box 30 (see Figures 2(b) and 2(c)).

[0036] Thereafter, by rotating the rotary lever and raising it, the ash receiving box 30 is pressed and raised by the protrusion 45a, and the upper end surface 32a of the peripheral wall 32 of the ash receiving box 30 is pressed against the lower surface 10e of the main body 10, thereby fixing the box in place. In this state, the gap 7 disappears (see FIG. 1(c) and FIGS. 3(a) to 3(c)).

[0037] In this fixed state, when the solid fuel 5 placed in the combustion chamber 15 is burned, the ash 3 generated by the combustion falls, but since there is no gap 7 between the main body 10 and the ash receiving box 30, the ash 3 does not spray out sideways while falling, and falls efficiently and smoothly into the ash receiving box 30.

[0038] Needless to say, in order to make it possible to switch between the fixed and unlocked states of the ash receiving box 30, it is necessary to adjust the vertical dimensions of the ash receiving box 30, the vertical dimensions of the mounting opening formed by the frame plate portion 41, the protruding dimension of the protrusion 45a, etc. The same applies to the combustion furnace 1 shown in Figures 5 to 7, which will be described later.

[0039] Next, the combustion chamber 15 inside the main body 10 will be described in detail with reference to FIGS. 4(a) to 4(c).

[0040] As shown in Figure 4(a), a lower opening 12 is formed in the bottom plate portion 10d, and in plan view, a portion of the support plate portion 43 of the storage support portion 40 and a portion of the support rod 45 including the protrusion 45a are exposed through the lower opening 12.

[0041] As shown in Figures 4(a) to (c), charcoal holder support parts 18 are formed by cutting and raising a part of the bottom plate part 10d on both front and rear edges (longer edges in the illustrated example) of the lower opening 12. As shown in Figures 4(b) and 4(c), charcoal holder support part 18 is formed with a plurality of fitting receiving parts 18a formed in a roughly semicircular shape so that a plurality of round rod-shaped charcoal holders 16 can be fitted and installed.

[0042] As shown in Figures 4(b) and (c), the charcoal rod 16 is installed so as to span both charcoal rod support portions 18. When multiple charcoal rods 16 are installed, an ash drop opening 17 is formed between adjacent charcoal rods 16. Charcoal (solid fuel 5) can be placed across multiple charcoal rods 16. Conventionally, plate-shaped grates used in charcoal stoves and the like require complete replacement when damaged through use, but the areas susceptible to damage from heat are often limited. Furthermore, because solid fuel is placed on top of the grates, replacing the grates can be difficult as they are covered in ash. With the above configuration, only charcoal rods 16 damaged by heat can be replaced, and replacement is easy because each rod-shaped charcoal rod 16 can be replaced individually. The above configuration also has the advantage of requiring less space when storing replacement charcoal rods 16 than plate-shaped grates.

[0043] In this way, by placing the solid fuel 5 on the charcoal rod 16 and fixing the ash receiving box 30 to the bottom of the main body 10, the solid fuel 5 is ready to burn. During combustion of the solid fuel 5, if a gap is formed on the upper opening 11 side by an iron plate (not shown) or a mesh (not shown), air will be sent into and circulate in the combustion chamber 15. To further promote air circulation, the ventilation window 33 of the ash receiving box 30 can be opened as appropriate (see Figure 3(a)).

[0044] During combustion, ash 3 generated by the combustion of solid fuel 5 falls through ash drop opening 17 and accumulates on the inner bottom surface of bottom 31 of ash receiving box 30. In this fixed state, there is no gap 7 between main body 10 and ash receiving box 30, so the falling ash 3 is prevented from scattering to the outside midway, and almost all of the ash 3 is received by ash receiving box 30.

[0045] Furthermore, since the operating unit 46 must be operated to pull out the fixed ash receiving box 30, it is possible to prevent the ash receiving box 30 from being pulled out by mistake during combustion. This makes it possible to avoid combustion when the ash receiving box 30 is not located below the main body 10, and to prevent the ash 3 from falling to the ground.

[0046] Because this configuration prevents the ash 3 from scattering outside the combustion furnace 1 as it falls, there is little chance of the surrounding area being soiled by the ash 3, making it easier to clean the area around the combustion furnace 1 after use. Furthermore, since the ash collection box 30 can be configured with a larger capacity than conventional thin, dish-shaped boxes, it is ideal for commercial charcoal stoves used daily in restaurants that serve yakitori, for example, or wood-burning stoves used daily in winter, reducing the number of times the ash 3 needs to be disposed of frequently. Furthermore, the ash 3 can be easily disposed of by releasing and removing the ash collection box 30. The main body 10 and the ash collection box 30 can be easily separated, making cleaning each easy.

[0047] Furthermore, by maintaining the main body 10 and the ash receiving box 30 in a fixed state and placing a lid 20 (see Figure 3(c)) on the upper opening 11, the inside can be left as it is (for example, with the remaining charcoal placed there and the ash 3 in the ash receiving box left as it is), thereby shutting down the inflow of air and creating an airtight state, making it a so-called fire extinguisher.

[0048] Although a barbecue stove has been used above as an example of the combustion furnace 1, it can also be applied to various other combustion furnaces 1 such as wood stoves, and it can be smaller or larger than the one shown in the figure, and can be applied to combustion furnaces 1 that use solid fuel 5. Furthermore, it is not necessary for the legs 21 to be able to secure space for the storage support part 40; it is also possible for the main body 10 to be suspended and the storage support part 40 to be disposed below it.

[0049] Furthermore, the configuration and shape of the combustion furnace 1 according to the embodiment described above are merely examples, and it goes without saying that the configuration and shape can be appropriately changed to other than those shown in the drawings. [Explanation of symbols]

[0050] 1. Combustion furnace 3 ash 5 Solid fuel 7. Gap 10 Main Unit 10a Front plate part 10b Back plate part 10c Side plate part 10d Bottom plate part 10e Bottom 11 Top opening 12 Lower opening 13 Rod-shaped body 15 Combustion chamber 16 Charcoal holder 17 Ash fall opening 18 Charcoal holder support 18a Fitting receiving part 19 Heat-resistant bricks 20 Lid 21 Legs 30 Ash box 31 Bottom 32 Peripheral wall 32a Upper end surface 45 Support rod 45a Protrusion 46 Operation unit (rotating lever)

Claims

1. The fire extinguisher comprises a main body having a combustion chamber therein for burning solid fuel, an ash receiving box having a peripheral wall and a bottom and opening upward, which is stored below the main body so as to be in communication with the combustion chamber, a storage support part for supporting the ash receiving box stored below the main body, and an operating part for freely switching between fixing and releasing the fixing of the ash receiving box to the main body, the storage support portion has a support rod rotatably supported by the operation portion, A protrusion protruding in one circumferential direction is provided at a longitudinal intermediate portion of the support rod, A combustion furnace characterized in that the ash receiving box is stored below the main body, and the bottom is lifted by using the operating unit to rotate the protrusion to a position where it presses against the bottom of the ash receiving box, and the upper end surface of the peripheral wall is pressed against the underside of the main body, thereby fixing it to the main body.

2. In claim 1, A combustion furnace characterized in that the storage support section sandwiches the ash receiving box from both sides in one direction and is equipped with a bearing frame that supports the support rod, and the upper end of the bearing frame is fixed to the main body.

3. In claim 1 or claim 2, A combustion furnace characterized in that the combustion chamber is provided with a plurality of removable charcoal placing rods installed so as to form a plurality of ash dropping openings.

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