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 using solid fuels such as charcoal and firewood.

Background Art

[0002] As conventional combustion furnaces of this type, various types have been proposed that include a main body having a combustion chamber at the upper part and an ash receiving box at the lower part for receiving and storing ash falling from the combustion chamber (see, for example, Patent Document 1).

[0003] In this type of combustion furnace, in order to easily discard ash, an ash receiving box separate from the main body is arranged below the main body, or, as in the case of Patent Document 1, a separate dish-shaped ash receiving box is of a pull-out type that can be freely taken in and out.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, conventional combustion furnaces of this type do not have means for fixing a separate ash receiving box to the main body without a gap. That is, even during the combustion of solid fuel, the ash receiving box can be taken out or pulled out. Therefore, if an incorrect operation is performed, there is a risk that ash cannot be received by the ash receiving box.

[0006] Also, in the case where the ash receiving box separate from the main body can be freely taken in and out, 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, there is a risk that ash falling from the combustion chamber during the fall scatters to the outside through the gap, which may stain the periphery of the combustion furnace.

[0007] Furthermore, in the case of portable combustion furnaces such as barbecue sets, if the ash box is designed to be easily inserted into and removed from the main unit, there is a problem in that it is difficult to move the main unit and the ash box as a single unit.

[0008] This invention was proposed in consideration of these circumstances, and its objective is to provide a combustion furnace in which a main body having a combustion chamber and an ash receiving box can be fixed to each other without any gaps. [Means for solving the problem]

[0009] To achieve the above objective, the combustion furnace of the present invention comprises a main body having a combustion chamber for burning solid fuel inside, an ash receiving box having a peripheral wall and a bottom and opening upward, housed below the main body so as to communicate with the combustion chamber, a storage support part for supporting the ash receiving box housed below the main body, and an operating part for switching between fixing and releasing the ash receiving box to the main body, wherein the storage support part has a support rod pivotally supported by the operating part so as to be rotatable, and a projection is provided at the middle of the longitudinal direction of the support rod, projecting in one direction in the circumferential direction, the ash receiving box is housed below the main body, and the bottom is lifted by rotating the operating part so that the projection is pressed against the bottom of the ash receiving box, and the upper end surface of the peripheral wall is pressed against the lower surface of the main body and fixed to the main body. [Effects of the Invention]

[0010] Since the combustion furnace of the present invention has the configuration described above, 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 drawing]

[0011] [Figure 1] This is an explanatory diagram of a combustion furnace according to an embodiment of the present invention. (a) is a perspective view of the main body, (b) is a perspective view of the ash receiving box, and (c) 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 box released, and (b) and (c) are side views showing the procedure for installing the ash box. [Figure 3] (a) is a front view of a combustion furnace with the ash box fixed in place, (b) is a side view thereof, and (c) is a front view showing another configuration of the combustion furnace with the ash box fixed in place. [Figure 4] (a) is a plan view of the combustion furnace, (b) is a plan view of the combustion furnace with the charcoal support rods installed, and (c) is a cross-sectional view taken along line XX in (b). [Modes for carrying out the invention]

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

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

[0014] The ash receiving box 30 is stored below the main body 10, and its bottom 31 is pressed and lifted by the storage support part 40, allowing the upper end surface 32a of the peripheral wall 32 to 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 barbecue grill shown in Figures 1 to 4 as an example. In this specification and the claims, the combustion furnace 1 and each of its constituent parts will be described with reference to the perspective view in Figure 1(a), defining directions such as up and down, front and back.

[0016] The combustion furnace 1 shown in FIGS. 1 to 4 has a configuration further provided with an operation unit 46 in the above-described schematic basic configuration, and is configured such that, by operating the operation unit 46, switching between fixing and releasing the fixing of the ash receiving box 30 to the main body 10 is performed.

[0017] The main body 10 is a box-shaped body made of metal (such as steel or stainless steel) with openings at the top and bottom. That is, the main body 10 has an outer shape 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, has an upper opening 11, and a lower opening 12 is formed at the center of the bottom plate portion 10d (see FIG. 4(a)).

[0018] The main body 10 includes a combustion chamber 15 inside. Combustion of the solid fuel 5 (see FIG. 4(c)) is performed inside the combustion chamber 15 with the heat-resistant bricks 19 arranged on the inner peripheral side of the main body 10 (see FIG. 1(a)).

[0019] The heat-resistant bricks 19 are placed on the bottom plate portion 10d, the solid fuel 5 is arranged in the space surrounded by the heat-resistant bricks 19, and an iron plate (not shown) or a net (not shown) is placed on the heat-resistant bricks 19 so as to cover the upper opening 11 from above, enabling roasting chicken or barbecue by charcoal burning.

[0020] Rod-shaped bodies 13 are arranged so as to project downward one by one on the left and right of the rear part side of the bottom plate portion 10d (see FIG. 3(b)). These rod-shaped bodies 13 serve as stoppers when inserting the ash receiving box 30. The rod-shaped bodies 13 are formed by screwing headless bolts with nuts on the inner bottom surface side of the main body 10 so that the protruding degree can be adjusted.

[0021] The storage support portion 40 includes a frame plate portion 41 formed by processing a strip plate into an inverted U shape in a front view, and a support rod 45 for supporting the ash receiving box 30 from below, and an operation unit 46 for operating the support rod 45 is provided (see FIG. 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 inner sides of both side plate portions 10c of the main body 10 in the bottom plate portion 10d. The frame plate portion 41 includes two suspension plate portions 42 and a bridging plate portion 43 that connects their lower ends, and the upper end portions 42b of the suspension plate portions 42 are fixed to the bottom plate portion 10d of the box-shaped body.

[0023] Also, round holes 42a are formed in the vicinity of the lower end portions of the suspension plate portions 42, that is, in the vicinity of the bent portions between the suspension plate portions 42 and the bridging plate portion 43. A metal support rod 45 is inserted through both round holes 42a and is attached so as to be disposed above the bridging plate portion 43. This support rod 45 is a cylindrical rod body and rotation is allowed. In order to enable the support rod 45 to rotate, the round holes 42a of the two suspension plate portions 42 constitute the bearing portions of the support rod 45. That is, the frame plate portion 41 constitutes a bearing frame.

[0024] An operation portion 46 formed of a rotation lever for rotating the support rod 45 is bent and integrally formed with the support rod 45 at one end in the longitudinal direction of the support rod 45. Further, the support rod 45 has a protrusion 45a protruding to one side in the radial direction of the axis at the intermediate portion in the longitudinal direction (substantially the center in this illustrated example). By operating the operation portion 46, reciprocating rotation is possible between a state where the protrusion 45a is directed upward (the state shown in FIG. 1(a)) and a state where it is directed in the lateral direction.

[0025] In this 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 side in the radial direction of the support rod 45. For example, a separate member may be integrated with the non-bent support rod 45 by welding or the like to form the protrusion 45a.

[0026] As will be described later, since the ash receiving box 30 is supported from below by the protrusion 45a of the support rod 45, the bridging plate portion 43 disposed below the support rod 45 is not an essential component, and a frame plate portion 41 without the bridging plate portion 43 may be used. Of course, in order to make the frame plate portion 41 more robust, it is desirable to include the bridging plate portion 43.

[0027] The main body 10 is further fitted with 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 secure space for the storage support section 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 perimeter walls 32 and a bottom 31, and is shaped with an opening at the top, so that it can receive the 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 on the front wall 32b of the perimeter walls 32 (see Figure 1(b) above). A handle 34 provided on the ventilation window 33 is used for inserting and removing the ash receiving box 30 and for sliding the ventilation window 33.

[0029] Figures 1(c) and 3(a) to 3(c) show the ash receiving box 30 positioned in the space below the main body 10, and the ash receiving box 30 in a fixed state where its movement is locked.

[0030] In this fixed state, the rotating lever is upright in the vertical direction, similar to the upright direction of the suspension plate portion 42. In this state, the tip of the projection 45a of the support rod 45 points upward, and presses against the bottom 31 of the ash receiving box 30 with its tip. As a result, the upper end surface 32a of the peripheral wall 32 of the ash receiving box 30 is in contact with the lower surface 10e of the main body 10.

[0031] In Figures 1(a), 2(a), etc., the reference numeral 42c indicates a lever stopper designed to prevent the rotating lever from rotating too far backward, that is, to prevent the projection 45a from tilting backward.

[0032] In the fixed state, the main body 10 and the ash receiving box 30 are in communication internally through the lower opening 12 of the main body 10 (see Figure 4) and the opening of the ash receiving box 30, while externally, as shown in Figure 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 conventional, well-known rail structure that can be pulled out forward and backward is applied to the ash receiving box, precision is required for the rail and box to slide smoothly, and applying it to the main body 10, which is made of metal, would be costly. Moreover, simply adopting a rail structure does not result in a structure that does not form the gap 7 mentioned above. With the above 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 a gap 7, and the ash receiving box 30 can be easily pulled out to dispose of the ash, while maintaining a simple structure.

[0033] In order to fix the main unit 10 and the ash receiving box 30 in place, the following procedure should be followed. The procedure will be explained with reference to Figures 2(a) to (c).

[0034] First, position the rotating lever (operating part 46) so that it is roughly parallel to the bottom surface of the main body 10, and place the projection 45a of the support rod 45 sideways (lay it flat). Then, insert the ash receiving 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) above).

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

[0036] Subsequently, by rotating the rotary lever to raise the ash receiving box 30, the ash receiving box 30 is pressed and lifted by the projection 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, resulting in a fixed state. In this state, the gap 7 disappears (see Figures 1(c) and 3(a)-(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 down. However, 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 during its descent, but falls efficiently and smoothly into the ash receiving box 30.

[0038] It goes without saying that 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 mutual dimensions of the ash receiving box 30, the vertical dimensions of the mounting opening created by the frame plate portion 41, and the protruding dimension of the projection portion 45a. The same applies to the combustion furnace 1 shown in Figures 5 to 7, which will be described later.

[0039] Next, the details of the combustion chamber 15 inside the main body 10 will be explained with reference to Figures 4(a) to (c).

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

[0041] As shown in Figures 4(a) to 4(c), charcoal support rods 18 are formed on both front-to-back edges (long edges in the illustrated example) of the lower opening 12 by cutting and bending a portion of the bottom plate 10d. As shown in Figures 4(b) and 4(c), the charcoal support rods 18 have multiple fitting receiving portions 18a formed in a substantially semicircular shape so that multiple round bar-shaped charcoal support rods 16 can be fitted and installed.

[0042] As shown in Figures 4(b) and 4(c), the charcoal support rods 16 are installed so as to span across both charcoal support rod support sections 18. When multiple charcoal support rods 16 are installed, ash drop openings 17 are formed between adjacent charcoal support rods 16. Charcoal (solid fuel 5) can be placed across multiple charcoal support rods 16. Conventionally, plate-shaped grates used in charcoal stoves and the like require the entire grate to be replaced when it becomes damaged from use, but the parts that are easily damaged by the heat are often limited. Also, since solid fuel is placed on the grate, replacing the grate is difficult and messy. With the above configuration, only the charcoal support rods 16 that have been damaged by the heat can be replaced, and even when replacing them, the rod-shaped charcoal support rods 16 can be replaced one at a time, making replacement easy. Furthermore, with the above configuration, there is the advantage that replacement charcoal support rods 16 take up less space when stored compared to plate-shaped grates.

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

[0044] During combustion, the ash 3 generated by the combustion of the solid fuel 5 falls through the ash drop opening 17 and accumulates on the inner bottom surface of the bottom 31 of the ash receiving box 30. In this fixed state, there is no gap 7 between the main body 10 and the 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 caught in the ash receiving box 30.

[0045] Furthermore, since the operation of the control unit 46 is required to pull out the ash collection box 30, which is in a fixed position, it is possible to prevent accidentally pulling out the ash collection box 30 during combustion. Therefore, combustion can be avoided when the ash collection box 30 is not located below the main body 10, and the ash 3 falling to the ground can be prevented.

[0046] This configuration prevents the ash 3 from scattering outside the combustion furnace 1 as it falls, thus reducing the likelihood of the surrounding area being contaminated by ash 3, and making it easier to clean the area around the combustion furnace 1 after use. Furthermore, the ash receiving box 30 can be configured with a larger capacity compared to conventional thin, dish-shaped boxes, making it suitable for commercial charcoal grills used daily in restaurants serving yakitori, or wood-burning stoves used daily in winter, thus reducing the frequency of ash 3 disposal. In addition, ash 3 can be easily disposed of by releasing the ash receiving box 30 and removing it. The main body 10 and the ash receiving box 30 can be easily separated, making it easy to clean each of them.

[0047] Furthermore, by maintaining the fixed state between the main body 10 and the ash receiving box 30, and by placing the lid 20 (see Figure 3(c)) over the upper opening 11, the interior can be kept as is (for example, with the remaining charcoal and the ash 3 in the ash receiving box left as is), while shutting off the inflow of air and creating a sealed state, thus enabling it to function as a so-called fire extinguishing pot.

[0048] Although a barbecue grill was used as an example of the combustion furnace 1 above, it can be applied to various combustion furnaces 1 such as wood-burning stoves, and can be smaller or larger than the illustrated example, and can be applied to combustion furnaces 1 that use solid fuel 5. Furthermore, it is not necessary for the legs 21 to secure space for the storage support section 40, and the main body 10 may be suspended and the storage support section 40 may be placed 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 configurations and shapes other than those shown in the figures can be appropriately modified. [Explanation of Symbols]

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

Claims

1. The device comprises a main body having a combustion chamber for burning solid fuel, an ash box having a peripheral wall and a bottom and opening upward, housed below the main body so as to be in communication with the combustion chamber, a storage support part for supporting the ash box housed below the main body, and an operating part for switching between fixing and releasing the ash box to the main body. The storage support section has a support rod that is rotatably supported by the operating section, The support rod has a projection in the middle of its longitudinal direction that protrudes in one direction in the circumferential direction. A combustion furnace characterized in that the ash receiving box is housed below the main body, and the bottom is lifted by rotating the projection of the operating unit to a position where it presses against the bottom of the ash receiving box, thereby pressing the upper end surface of the peripheral wall against the lower surface of the main body and fixing it to the main body.

2. In claim 1, The aforementioned storage support section is characterized in that it sandwiches the ash receiving box from both sides in one direction and is equipped with a bearing frame that pivotally 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, The combustion chamber is characterized by having a plurality of removable charcoal resting rods, which are installed so as to form a plurality of ash drop openings.

Images