Firing oven

Abstract

The present invention provides a kiln equipped with a foldable furnace body, which can be easily folded for convenient portability and storage. Furthermore, it provides a heating device that can heat the firing space and simultaneously heat the area above the top lid. [Solution] In a kiln comprising a base, a foldable furnace body, a top lid, and a heating device, the base has an upper storage tank, the foldable furnace body has multiple wall plates that can change between an unfolded state and a folded state, the top plate of the top lid is recessed to form a heating tank, the heating device is provided inside the top lid and is located on the opposite side of the heating tank, when the foldable furnace body is in the unfolded state the wall plates are formed together to surround the firing space and are detachably inserted into the upper storage tank, and the top lid detachably covers the upper side of the foldable furnace body. At this time the heating device faces the firing space and heats the firing space and the heating tank simultaneously with the generated thermal energy.

Description

Technical Field

[0001] The present invention relates to a baking furnace, and more particularly to a folding baking furnace capable of heating both the inside and outside of the upper lid in both directions.

Background Art

[0002] Conventional baking furnaces include a housing and a heater. A firing space for placing the object to be fired is provided inside the housing. The heater is provided inside the housing to heat the firing space and heat the object to be fired within the firing space.

[0003] Taking a household baking furnace as an example, the baking furnace brings convenience and enjoyment to the baking of food. However, the housing of the baking furnace is composed of a plurality of plate pieces, and the plate pieces are fixedly connected to each other. Therefore, the shape of the housing is fixed and occupies a considerable volume. When it is necessary to move the baking furnace, the user usually has to carry the housing, which is inconvenient to move. Furthermore, when storing the baking furnace, since the housing occupies a considerable volume, a larger storage space is required for storing the baking furnace.

[0004] Thus, due to the inconvenience of moving and storing the baking furnace, it can usually only be used at a fixed position within the home and is rarely carried outdoors for camping or the like. Also, even after taking food out of the baking tray, the baking furnace cannot continuously heat or keep warm these foods.

[0005] Therefore, the design of the conventional baking furnace is not yet perfect and there is room for improvement.

Summary of the Invention

Problems to be Solved by the Invention

[0006] In view of the above, an object of the present invention is to provide a baking furnace having a foldable furnace body that can be easily folded to facilitate portability and storage. Further, an object is to provide a heating device capable of realizing heating above the upper lid while heating the firing space. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a kiln comprising: a base comprising a bottom plate and a plurality of side plates, the side plates being connected to the bottom plate and together with the bottom plate forming an upper storage tank; a folding furnace body comprising a plurality of wall plates that can be changed between an unfolded state and a folded state, the wall plates being formed to collectively surround a firing space in the unfolded state, and the bottom side of the wall plates being detachably inserted into the upper storage tank; an upper lid comprising a top plate, the top plate being recessed to form a heating tank having a tank surface; and a heating device provided inside the upper lid and located on the opposite side of the tank surface of the heating tank, wherein when the folding furnace body is in the unfolded state, the upper lid detachably covers the upper side of the wall plates, the heating device faces the firing space, and the thermal energy generated by the heating device heats the firing space and the tank surface of the heating tank. [Effects of the Invention]

[0008] The kiln of the present invention has the effect of having a heating device on the top lid that can heat both the firing space and the surface of the heating tank simultaneously. This design overcomes the limitation of conventional kilns, which could only fire inside the kiln. In addition, the foldable kiln body can be flexibly converted between an unfolded and folded state, giving the kiln high portability. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of a kiln according to a first preferred embodiment of the present invention. [Figure 2] This is a partially exploded perspective view of a furnace according to the above preferred embodiment of the present invention. [Figure 3] This is a rear view of a furnace according to the above preferred embodiment of the present invention. [Figure 4] This is a perspective view of the top lid according to the above preferred embodiment of the present invention, showing the top lid in an inverted position. [Figure 5] This is a perspective view of a foldable furnace body according to the above preferred embodiment of the present invention. [Figure 6]This is a perspective view of the base according to the above preferred embodiment of the present invention. [Figure 7] This is a cross-sectional view in the direction of 7-7 in Figure 3. [Figure 8] This is a cross-sectional view in the 8-8 direction in Figure 2. [Figure 9] This is a perspective view of a kiln according to the above preferred embodiment of the present invention, showing the kiln plate placed on the top cover. [Figure 10] This is a side view of a foldable furnace body according to the above preferred embodiment of the present invention, showing the folded state. [Figure 11] This is an exploded perspective view showing the storage state of the furnace according to the above preferred embodiment of the present invention. [Figure 12] This is a perspective view showing the storage state of the kiln according to the above preferred embodiment of the present invention. [Figure 13] This is a perspective view from the bottom direction showing the storage state of the oven according to the above preferred embodiment of the present invention. [Figure 14] This is a perspective view of a foldable furnace body according to a second preferred embodiment of the present invention. [Modes for carrying out the invention]

[0010] To more clearly explain the present invention, preferred embodiments are given below and described in detail with reference to the drawings. As shown in Figures 1 to 13, the oven 100 of the first preferred embodiment of the present invention includes a base 10, a foldable oven body 20, a top lid 30, and a heating device 40. Furthermore, the oven 100 may include at least one baking plate 50. In this embodiment, there are multiple baking plates 50, including a first baking plate 502 and a second baking plate 504. The surface of the first baking plate 502 has multiple mesh holes 502a, and the first baking plate 502 can be used in combination with a handle 502b in a detachable manner. The surface of the second baking plate 504 is recessed downwards and does not have mesh holes, and the surface of the second baking plate 504 can be used to place food or to receive liquids such as oil and water.

[0011] The base 10 includes a plurality of side plates 12 and a bottom plate 11. These side plates 12 are connected to the bottom plate 11 and together with the bottom plate 11 form the upper storage compartment 13 (see Figures 6 and 7). The side plates 12 of the base 10 include a front side plate 121, a rear side plate 122, a left side plate 123, and a right side plate 124. The bottom plate 11 is provided with a plurality of fixed seats 111, each adjacent to each side plate 12, and a gap 112 is formed between each fixed seat 111 and the side plate 12. In this embodiment, the fixed seats 111 of the base 10 include two front fixed seats 111c, two rear fixed seats 111d, one left fixed seat 111a, and one right fixed seat 111b. In some embodiments, the number of front fixed seats 111c and rear fixed seats 111d may be one each.

[0012] Furthermore, the base 10 is equipped with a plurality of fasteners 14, which include at least one front fastener 141 and at least one rear fastener 142. In this embodiment, it is composed of two front fasteners 141 and two rear fasteners 142, with the two front fasteners 141 provided on the front side plate 121 and the two rear fasteners 142 provided on the rear side plate 122.

[0013] Refer to Figures 6, 8, and 13. A lower storage compartment 15 is formed at the bottom of the base plate 11, and two leg supports 16 are pivotally supported in the lower storage compartment 15. The two leg supports 16 are rotatable between a first position P31 shown in Figure 8 and a second position P32 shown in Figure 13. When the two leg supports 16 are rotated to the first position P31, a portion of the leg supports 16 is located outside the lower storage compartment 15, and the leg supports 16 abut against two opposing compartment walls 151 of the lower storage compartment 15, causing the two leg supports 16 to be open to each other. When the two leg supports 16 are rotated to the second position P32, the leg supports 16 are folded horizontally and stored inside the lower storage compartment 15.

[0014] Refer to FIGS. 5 to 7. The folding furnace body 20 has a plurality of wall plates 21, and these wall plates 21 include a front wall plate 211, a rear wall plate 212, a first left side wall plate 213, a second left side wall plate 214, a first right side wall plate 215, and a second right side wall plate 216. Both ends of the front wall plate 211 are pivotally attached to the first left side wall plate 213 and the first right side wall plate 215 respectively, and both ends of the rear wall plate 212 are pivotally attached to the second left side wall plate 214 and the second right side wall plate 216 respectively. Left support frames 22 are provided on the inner surfaces of the first left side wall plate 213 and the second left side wall plate 214 respectively, and right support frames 23 are provided on the inner surfaces of the first right side wall plate 215 and the second right side wall plate 216 respectively. Each left support frame 22 has at least one left support portion 22a, and each right support frame 23 has at least one right support portion 23a. In this embodiment, there are a plurality of left support portions 22a of the left support frame 22, and each left support portion 22a is a left guide groove 221. There are also a plurality of right support portions 23a of the right support frame 23, and each right support portion 23a is a right guide groove 231.

[0015] When the folding furnace body 20 is in the unfolded state, the wall plates 21 are formed to jointly surround the firing space S1, and the bottom side of the wall plates 21 is detachably inserted into the gap 112 of the base 10. The left fixed seat 111a abuts against the pivoting portion between the first left side wall plate 213 and the second left side wall plate 214, and the right fixed seat 111b abuts against the pivoting portion between the first right side wall plate 215 and the second right side wall plate 216. At this time, the corresponding two left support portions 22a extend along the first axis A1, the corresponding two right support portions 23a extend along the second axis A2, and the first axis A1 is parallel to the second axis A2.

[0016] Refer to FIGS. 3, 5 and 6. A plurality of second latching seats 25 are provided on the folding furnace body 20, and these second latching seats 25 respectively correspond to the latches 14. The second latching seat 25 includes at least one front latching seat 251 and at least one rear latching seat 252. In this embodiment, two front latching seats 251 and two rear latching seats 252 are provided. The two front latching seats 251 are provided on the front wall plate 211, and the two rear latching seats 252 are provided on the rear wall plate 212. When the folding furnace body 20 is in the unfolded state, the furnace body 20 is arranged in the upper storage tank 13 of the base 10, and each latch 14 is detachably locked to each second latching seat 25. That is, each front latch 141 is locked to each front latching seat 251, and each rear latch 142 is locked to each rear latching seat 252, whereby the folding furnace body 20 is more stably installed on the base 10.

[0017] Refer to FIGS. 5 and 9. An inlet 211a is provided on the front wall plate 211 of the folding furnace body 20, and the front latching seat 251 is located below the inlet 211a. The inlet 211a corresponds to two left guide grooves 221 and two right guide grooves 231. A door plate 217 is pivotally supported on the front wall plate 211, and at least one avoiding notch 217a is provided at the lower part of the door plate 217. In this embodiment, two avoiding notches 217a are formed. The door plate 217 is rotatable between a closed position P21 and an open position P22. When the door plate 217 rotates to the closed position P21, the inlet 211a is closed, and the door plate 217 abuts against the front wall plate 211. When the door plate 217 rotates to the open position P22, the inlet 211a is opened, and the avoiding notch 217a surrounds the front latching seat 251. And when the door plate 217 rotates to the open position P22, both sides of the first baking tray 502 are inserted from the inlet 211a along the first axis A1 and the second axis A2, and are mounted in the left guide grooves 221 of the two left support parts 22a and the right guide grooves 231 of the two right support parts 23a. Both sides of the second baking tray 504 can also be inserted into another set of left guide grooves 221 and right guide grooves 231.

[0018] Refer to Figures 1, 3, and 4. The top cover 30 includes a top plate 31 and a wall 33. The top plate 31 is recessed to form a heating tank 32, which has a tank surface 321. The wall 33 is connected to the top plate 31 and has a notch 331. When the top cover 30 covers the upper side of the wall plates 21 of the collapsible furnace body 20, one of the wall plates 21 closes the notch 331. A fixing hook 34 is provided inside the top cover 30, and the fixing hook 34 is located on the opposite side of the tank surface 321 of the heating tank 32.

[0019] Furthermore, multiple fixing parts 332 are pivotally supported on the enclosure wall 33 of the top lid 30, and multiple fixing rings 26 are provided on the foldable furnace body 20, with the fixing rings 26 provided on the front wall plate 211 and the rear wall plate 212. When the foldable furnace body 20 is in the unfolded state and the top lid 30 covers the upper side of the wall plate 21, each fixing part 332 is rotatable between an engagement position P41 and a release position P42. When a fixing part 332 rotates to the engagement position P41, it engages with the fixing ring 26, and when a fixing part 332 rotates to the release position P42, it disengages from the fixing ring 26. In addition, multiple first locking seats 35 are provided on the enclosure wall 33 of the top lid 30, and these first locking seats 35 correspond to the second locking seats 25 of the bottom seat 10, respectively.

[0020] The heating device 40 is located inside the top lid 30, on the opposite side of the tank surface 321 of the heating tank 32. A flexible conduit 41 is connected to the heating device 40, and the flexible conduit 41 extends outside the enclosure wall 33. In this embodiment, the heating device 40 is a gas burner, the flexible conduit 41 is a gas conduit, and the gas conduit communicates with the gas canister 1. In other embodiments, the heating device 40 may be an electric heater. When the top lid 30 is removed from the wall plate 21 of the foldable furnace body 20, the flexible conduit 41 can be stored inside the top lid 30 through the opening 331, and the flexible conduit 41 is secured by fixing hooks 34.

[0021] As shown in Figures 1, 8, and 9, when the top lid 30 is detachably covered by the wall plate 21 of the foldable furnace body 20, the heating device 40 faces the firing space S1, and the thermal energy generated by the heating device 40 heats the firing space S1 and the surface 321 of the heating tank 32. For example, the flame generated by the combustion of gas in the heating device 40 is directed upward, heating the surface 321 of the heating tank 32 on the top plate 31, and this heat simultaneously heats the firing space S1 downward. This allows a pot 4 to be placed on the surface 321 and heated. Alternatively, a baking plate 50, for example, a second baking plate 504, can be placed in the heating tank 32, with the second baking plate 504 in contact with the periphery of the heating tank 32 and maintaining a distance from the surface 321. Some of the thermal energy generated by the heating device 40 is transferred to the second baking plate 504 via the heating tank 32, and as a result, food on the second baking plate 504 can be heated or kept warm. In other preferred embodiments, the container placed on the tank surface 321 is not limited to a grill or pot 4, but may be a plate, box, bowl, or other heatable container for holding food.

[0022] Refer to Figure 10. The foldable furnace body 20 can also be transformed into a folded state. In the folded state, the outer surfaces of the first left wall plate 213 and the second left wall plate 214 face each other, the inner surface of the first left wall plate 213 faces the front wall plate 211, and one left support frame 22 is located between the first left wall plate 213 and the front wall plate 211. The inner surface of the second left wall plate 214 faces the rear wall plate 212, and another left support frame 22 is located between the second left wall plate 214 and the rear wall plate 212. Similarly, the outer surfaces of the first right wall plate 215 and the second right wall plate 216 face each other, the inner surface of the first right wall plate 215 faces the front wall plate 211, and one right support frame 23 is located between the first right wall plate 215 and the front wall plate 211. The inner surface of the second right-side wall panel 216 faces the rear wall panel 212, and another right support frame 23 is located between the second right-side wall panel 216 and the rear wall panel 212.

[0023] Refer to Figures 11 to 13. When the foldable furnace body 20 is in the folded state, the furnace body 20 is secured by the strap 28 and stored in the upper storage compartment 13 of the base 10. The top lid 30 can then be detachably attached to cover the side plates 12 of the base 10. Furthermore, the first baking plate 502, the second baking plate 504, and the handle 502b can also be stored in the upper storage compartment 13 of the base 10. When the top lid 30 covers the side plates 12 of the base 10, each fastener 14 of the base 10 is detachably attached to each first fastener 35. The two leg supports 16 are folded into the lower storage compartment 15. This effectively reduces the volume of the furnace 100 when it is stored.

[0024] As shown in Figure 14, a second preferred embodiment of the present invention is provided: a kiln 200. This kiln 200 has a structure that is generally similar to that of the first preferred embodiment, but the differences are as follows.

[0025] Each left support section 22a has a left support plate 222, and each right support section 23a has a right support plate 232. When the foldable furnace body 20 is unfolded, the two corresponding left support plates 222 extend along the first axis A1, the two corresponding right support plates 232 extend along the second axis A2, and the first axis A1 is parallel to the second axis A2. When the door plate 217 is rotated to the open position P22, both sides of the first baking plate 502 are positioned along the first axis A1 and the second axis A2 from the entrance 211a to the left support plates 222 of the two left support sections 22a and the right support plates 232 of the two right support sections 23a. Both sides of the second baking plate 504 can also be positioned to another set of left support plates 222 and right support plates 232. In this embodiment, the design of the left support plate 222 and the right support plate 232 allows the firing plate 50 to be more easily installed in the firing space S1 and to be stably placed on these support plates. The support plates provide a larger contact surface and effectively distribute the load, thereby reducing the risk of deformation of the support parts due to temperature and load when the firing furnace 200 is used at high temperatures.

[0026] As described above, the heating device 40 of the top lid 30 can simultaneously heat the firing space S1 and the tank surface 321 of the heating tank 32, and this design overcomes the limitation that conventional kilns could only fire inside the kiln. Furthermore, the foldable furnace body 20 can be flexibly switched between an unfolded state and a folded state, giving the kilns 100 and 200 high portability.

[0027] The foregoing describes only preferred and feasible embodiments of the present invention, and any equivalent modifications based on the specification and claims of the present invention should be included within the technical scope of the present invention. [Explanation of Symbols]

[0028] 1 gas can 4 Pot utensils 100,200 kilns 10 Bottom seat 11 Bottom plate 111 Fixed seat 111a Left fixed seat 111b Right fixed seat 111c Front fixed seat 111d Rear fixed seat 112 Gap 12 Side panels 121 Front side panel 122 Back side plate 123 Left side plate 124 Right side plate 13 Upper storage tank 14. Fasteners 141 Front hook 142 Rear hook 15 Lower storage tank 151 Tank wall 16 Leg rest 20 Foldable furnace body 21 Wallboard 21a Upper side 21b lower side 211 Front wall board 211a entrance 212 Rear wall board 213 1st left wall plate 214 2nd left side wall plate 215 1st right side wall plate 216 2nd right side wall plate 217 Door plate 217a Avoidance cut 22 Left support rack 22a Left support part 221 Left guide groove 222 Left support plate 23 Right support rack 23a Right support part 231 Right guide groove 232 Right support plate 24 burners 25 2nd latch seat 251 Front latching seat 252 Rear hanging seat 26 Fixed ring 28 obi 30 Top lid 31 Top plate 32 Heating tank 321 Tank surface 33 Enclosure 331 Missing mouth 332 Fixed part 34 Fixing hooks 35 1st hanging seat 40 Heating device 41 Flexible conduit 50 burners 502 First Burning Plate 502a mesh hole 502b Handle 504 Second Burning Plate P21 Closed position P22 Open position P31 1st position P32 2nd position P41 Engagement position P42 Release position S1 Firing Space A1 1st axis A2 2nd axis

Claims

1. A base comprising a bottom plate and multiple side plates, wherein the side plates are connected to the bottom plate and together with the bottom plate form an upper storage compartment, A foldable furnace body comprising multiple wall panels, which can be changed between an unfolded state and a folded state, wherein in the unfolded state the wall panels are formed to collectively surround the firing space, and the bottom side of the wall panels is detachably inserted into the upper storage tank, A top lid comprising a top plate, the top plate being recessed to form a heating tank having a tank surface, The heating device is provided inside the upper lid and is located on the opposite side of the heating tank surface, When the foldable furnace body is in the unfolded state, the top lid detachably covers the upper side of the wall plate, the heating device faces the firing space, and the thermal energy generated by the heating device heats the firing space and the surface of the heating tank. A kiln.

2. The furnace according to claim 1, wherein the base is provided on the bottom plate and includes a plurality of fixed seats adjacent to the side plates, the fixed seats form a gap between them and the side plates, and when the foldable furnace body is in an unfolded state, the bottom side of the wall plate is inserted into the gap.

3. The folding furnace body's wall plate includes a front wall plate, a rear wall plate, a first left wall plate, a second left wall plate, a first right wall plate, and a second right wall plate, the ends of the front wall plate being pivotally attached to the first left wall plate and the first right wall plate, the ends of the rear wall plate being pivotally attached to the second left wall plate and the second right wall plate, the first left wall plate being pivotally attached to the second left wall plate, the first right wall plate being pivotally attached to the second right wall plate, the fixing seat including a left fixing seat and a right fixing seat, the configuration such that when the bottom side of the wall plate is inserted into the gap, the left fixing seat abuts against the pivot point between the first left wall plate and the second left wall plate, and the right fixing seat abuts against the pivot point between the first right wall plate and the second right wall plate, as described in claim 2.

4. The folding furnace body includes two left support frames and two right support frames, the two left support frames being provided on the inner surface of a first left wall plate and the inner surface of a second left wall plate, the two right support frames being provided on the inner surface of a first right wall plate and the inner surface of a second right wall plate, the left support frames each having a left support portion, and the right support frames each having a right support portion, and when the folding furnace body is unfolded and the bottom side of the wall plate is inserted into the gap, the two left support portions extend along a first axis, the two right support portions extend along a second axis parallel to the first axis, the front wall plate has entrances corresponding to the two left support portions and the two right support portions, and further includes a baking plate that is inserted on both sides from the entrances along the first axis and the second axis and is positioned on the two left support portions and the two right support portions.

5. The furnace according to claim 4, wherein the left support portion is a left guide groove, the right support portion is a right guide groove, and when the foldable furnace body is in an unfolded state and the bottom side of the wall plate is inserted into the gap, the two left guide grooves extend along the first axis and the two right guide grooves extend along the second axis, and the baking plate is configured to be inserted from the entrance into the two left guide grooves and the two right guide grooves along the first axis and the second axis.

6. The furnace according to claim 4, wherein the left support portion each has a left support plate, the right support portion each has a right support plate, and when the foldable furnace body is in an unfolded state and the bottom side of the wall plate is inserted into the gap, the two left support plates extend along the first axis, the two right support plates extend along the second axis, and the baking plate is arranged on the two left support plates and the two right support plates along the first axis and the second axis from the entrance.

7. The furnace according to claim 4, wherein when the foldable furnace body is in a folded state, the outer surface of the first left wall plate and the outer surface of the second left wall plate face each other, the inner surface of the first left wall plate faces the front wall plate, one of the left support frames is located between the first left wall plate and the front wall plate, the inner surface of the second left wall plate faces the rear wall plate, the other left support frame is located between the second left wall plate and the rear wall plate, the outer surface of the first right wall plate and the outer surface of the second right wall plate face each other, the inner surface of the first right wall plate faces the front wall plate, one of the right support frames is located between the first right wall plate and the front wall plate, the inner surface of the second right wall plate faces the rear wall plate, and the other right support frame is located between the second right wall plate and the rear wall plate.

8. The oven according to claim 1, wherein when the foldable oven body is in a folded state, the foldable oven body is stored in the upper storage tank of the base, and the upper lid is configured to detachably cover the side plate of the base.

9. The oven according to claim 8, comprising a plurality of fasteners, a plurality of first fastener seats, and a plurality of second fastener seats, wherein the fasteners are provided on the bottom seat, the first fastener seats are provided on the top lid, and the second fastener seats are provided on the foldable oven body, wherein when the top lid covers the side plate of the bottom seat, the fasteners are each detachably locked to the first fastener seats, and when the foldable oven body is unfolded and the bottom side of the wall plate is inserted into the upper storage tank, the fasteners are each detachably locked to the second fastener seats.

10. The side plate of the base includes a front side plate, the fastener includes a front fastener provided on the front side plate, the wall plate of the foldable furnace body includes a front wall plate having an entrance, and the second fastener includes a front fastener provided on the front wall plate and located below the entrance. The oven according to claim 9, further comprising a door plate pivotally supported on the front wall plate, wherein a relief notch is formed at the bottom of the door plate, the door plate is rotatable between a closed position and an open position, in the closed position the door plate abuts against the front wall plate to close the entrance, and in the open position the entrance is opened, and the relief notch surrounds the front fastening seat.

11. A lower storage tank is formed at the bottom of the bottom plate of the base, two leg supports are pivotally supported in the lower storage tank, the two leg supports are rotatable between a first position and a second position, in the first position a part of the leg supports is located outside the lower storage tank and the two leg supports are extended from each other, and in the second position the leg supports are located inside the lower storage tank, as described in claim 1.

12. The oven according to claim 1, wherein the top cover comprises an enclosure wall connected to the top plate and having a notch formed therein, and when the top cover covers the upper side of the wall plate, one of the wall plates closes the notch, a flexible conduit is connected to the heating device, the flexible conduit extends outside the enclosure wall, and when the top cover is removed from the upper side of the wall plate, the flexible conduit is housed inside the top cover through the notch.

13. The oven according to claim 12, wherein a fixing hook is provided inside the top lid, and the fixing hook is configured to fix the flexible conduit when the flexible conduit is housed inside the top lid.

14. The oven according to claim 1, wherein the top lid is connected to the top plate and comprises an enclosure wall to which a plurality of fixing parts are pivotally supported, the foldable oven body is provided with a plurality of fixing rings, and when the foldable oven body is in an unfolded state and the top lid covers the upper side of the wall plate, the fixing parts are rotatable between an engaged position and a released position, when the fixing parts are rotated to the engaged position, the fixing parts engage with the fixing rings, and when the fixing parts are rotated to the released position, the fixing parts disengage from the fixing rings.

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