JPS60181524A - Inner box of cooking appliance - Google Patents

Abstract

PURPOSE:To obtain the cheap inner box of a cooking appliance, which can be manufactured efficiently and at the same time the number of parts of which is small, by a structure wherein the joining portion between a front and a rear plates and a cylindrical shell part are formed at the position recessed from the main surface of the front and the rear plates toward the cylindrical shell part side so as to locate the vicinity of the joining portion between the front and the rear plates and the cylindrical shell part toward the cylindrical shell part side from the tip of bent pieces. CONSTITUTION:Curling margin 16, 11A, 11B and 11C are formed along the rear end edges of a top plate 8 and a shell plate 9. A plurality of stretched-out portions 20 are formed in each curling margin. On the other hand, a bent piece 57a extending in the direction of a cylindrical shell part 6 is formed along the periphery of the rear plate 57. In addition, a groove 58, which dents from the main surface 57b of the rear plate 57 toward the direction of the top plate 8 and the shell plate 9, both of which consist of the cylindrical shell part, is provided on the rear plate 57. Further, upright shaved pieces, each of which is to join to the stretched-out portion 20 provided in each curled lug of the top plate 8 and of the shell plate 9, are provided in the groove 58. Due to the structure as mentioned above, the cheap inner box of a cooking appliance, which can be manufactured efficiently and the number of parts of which is small, can be made.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of an inner box for a medical appliance such as a microwave oven or an oven, which has an improved joint.

Artificial (F) 101 FIG. 1 is an external perspective view showing an example of a microwave oven to which the present invention is applied. The microwave oven 1 consists of a main body 2 and a door 3. The main body 2 includes an inner box 4. A heating cooking appliance such as a microwave oven is provided with an inner box 4 in order to effectively utilize heat and prevent radio wave leakage, and therefore the main body 2 has a double structure.

FIG. 2 is a perspective view showing an example of the inner box 4, and the inner box 4 is composed of a front plate 5, a cylindrical body 6, and a rear plate 7. The body 6 is composed of a top plate 8 and a body plate 9 having a U-shaped cross section, one end of which is joined to the opening 10 of the front plate 5, and the other end joined to the rear plate 7. In the inner box 4 shown in FIG. 2, the front plate 5 and the rear plate 7 have bent pieces 5a*7 bent from the respective main surfaces toward the body 6.
a is formed. The bent pieces 5a and 7a are essential for providing strength to the inner box 4, and by providing these bent pieces 5a and 7a, the front plate 5 and the rear plate 7
can also serve as the front and rear plates of the outer box of the microwave oven body 2 shown in FIG. The reason why the front plate 5 and the rear plate 7 are configured to have a larger area than the opening of the body 6 is to arrange various parts around the cylindrical body 6.

By the way, in the inner box 4 shown in FIG. 2, the front plate 5 and the rear plate 7 also serve as the front plate and the rear plate of the outer box.
This has the advantage that the number of parts can be reduced. However, in the conventional inner box 4 of this type, the front plate 5, the body 6, and the rear plate 7 are joined by spot welding, riveting, screwing, or the like.

Therefore, there is a problem in that the joining work is complicated, and as a result, the cost of the inner box 4 is high. Especially when using spot welding, the parts to be welded are wI! Since the steel plates should not be coated, it is not possible to join them using painted steel plates, and therefore, the complicated painting operation must be performed again after joining, which poses a problem in that the work is forced to be even more complicated.

Therefore, conventionally, the front plate, rear plate, and body are joined by a curling process. f! An inner box for the equipment is proposed. FIG. 3 is a schematic partially cutaway perspective view showing an example of the inner box of the m111 device joined by curling. Here, a front plate 5, a body part 6 and a rear plate 7 are shown.
are joined together by curling. Third
In the inner box 4 shown in the figure, as shown in the exploded perspective view No. 41!1, the body plate 9 has three curling grooves on one side of the plate made of a metal material such as stainless steel. 11A, 118.11C and flange part 12A
.

12B, and three curling margins 13A, 138, 130 and a flange portion 14 on the other side in the direction of the potato.
A, 14B (14A is not shown), and the other 2
One curling margin 15A, 15B is formed on each side, and then the entire board is bent so that the side in the yam direction forms a U-shape.

Curling margins 16, 17, and 18 degrees 19 are formed on the outer peripheral edges of the top plate 8, respectively.

In addition, the curling margin 13A of the top plate 8 and the body plate 9 to achieve the connection with the rear plate 7 is 138°130.16.
A plurality of projecting portions 20 are formed on each of the projecting portions 20, which are overlapped with projecting pieces 21 formed by cutting and bending the rear plate 7, and are then joined by a curling process.

Although not particularly shown in FIG. 4, the opening 10 of the front plate 5
, and the top plate 8 and body plate 9 that constitute the cylindrical IF4 section.
The curling margins 13A, 138, 13G, and 18 are also curled and joined by a known method. Similarly, the top plate 8 and the body plate 9 are joined by a curling margin of 17°19 on the top plate 8 and a curling margin of 15 degrees on the body plate 9.
This is done by curling between A and 15B.

By the way, each joint between the front plate 5, top plate 8, body plate 9, and rear plate 7 is structured as shown in FIG. By arranging them outside of the two, it is possible to join them at almost the same time.

However, as shown in the cross-sectional view of the joint portion between the top plate 8, the front plate 5, and the rear plate 7, the fifth factor is the mold 31 (indicated by an imaginary line) that is in contact with the L direction of the top plate 8. ), the front plate 5 and the rear plate 7 are brought into contact with the top plate 8 from the directions of arrows P and Q (1).

The bales that have been joined by contacting the other mold from the directions of arrows P and Q must be removed, but the bent pieces 5a as described above are formed on the front plate 5 and the rear plate 7, respectively.

7a is formed, it cannot be removed in the direction of arrow R in FIG. However, after each joint is made, the length in the lateral direction in the drawing of FIG. If a mold equipped with this is used, it is easy to remove the mold 31 after joining. However, when this type of special mold is used, there are problems in that the equipment becomes large in size and a drive source is required, resulting in high structural costs.

Therefore, in the conventional inner box 4 which is joined by a curling process, the rear plate 7 is provided with a bent piece 7a as shown in FIGS. 2 to 4, and does not serve as the rear plate of the outer box.
It merely closes the rear opening of the body 6, and the bent piece 7a
It was just a back plate that had no ridges attached. In other words, in the conventional inner box 4 that is joined by curling, the rear plate 7 cannot also serve as the rear plate of the outer box. There was a problem that the number of points could not be reduced and the cost was high.

Therefore, the purpose of this invention is to eliminate the above-mentioned same layer,
The purpose is to provide an inexpensive inner box for W IKB that can be efficiently produced and has a small number of parts.

Set 11111 In summary, the present invention includes a front plate having an opening, a cylindrical body having one end joined to the opening of the front cough plate, and a rear plate joined to the other end of the cylindrical body. , a bent piece is formed around the front plate and the rear plate, each bent from the main surface toward the cylindrical body. In the inner box III, so that the vicinity of the joint of the front plate and the rear plate with the cylindrical body is located closer to the cylindrical I1 part than the tip of the bent piece,
The joint portions of the front plate and the rear plate with the cylindrical body are formed by recessing from the main surfaces of the front plate and the rear plate toward the cylindrical body, and the front plate, the cylindrical body, and the rear plate are l1lIl! is characterized by being joined by curling process. l! This is the internal part of the equipment.

Hereinafter, by describing embodiments with reference to the drawings,
The rits+ of this invention will be clarified.

FIG. 6 is an exploded perspective view showing the process of assembling an embodiment of the present invention, and corresponds to FIG. 4. As is clear from FIG. 6, in this embodiment as well, there are curling margins 16, IIA, 11 on the rear edges of the top plate 8 and the body plate 9.
8.11C is formed, and each curling ring is formed with a plurality of overhanging portions 20. On the other hand, the rear plate 5
7 includes a bent piece 57 extending around the cylindrical part 6 in the direction of the cylindrical part 6.
a is formed. The structure up to this point is the same as that of the conventional inner box. However, the rear plate 57 is provided with a groove 58 that is recessed from the main surface 57b of the rear plate 57 toward the top plate 8 and copper plate 9 that constitute the cylindrical body. In the groove 58, cut and raised pieces to be joined to the overhanging portions 20 provided on each curling ring of the top plate 8 and body plate 9 are provided. FIG. 117 is a view of the rear plate 57 viewed from the rear to show the arrangement of the cut and raised pieces 59. As is clear from FIG. 7, the cut and raised pieces 59 are formed by cutting out the 1& portion of the groove 58 at a plurality of locations on the bottom of the groove 58.

8 and 9 are partially cutaway cross-sectional views showing the joining process of the overhanging portion 20 of the top plate 8 and the cut-and-raised piece 59 of the rear plate 57. FIG. As is clear from FIG. 8, on the rear edge of the top plate 8, a plurality of protruding parts 20 are formed in the car linkage 16 as described above, and on the other hand, a groove 5 in the rear plate 57 is formed.
A cut-and-raised piece 59 is formed at the bottom of 8, which is cut and raised toward the cylindrical body. Now, by bringing the two parts close to each other and abutting the molds from both sides of the joined part, curling can be performed as shown in FIG. 9. Body plate 9
Each curling margin 11A, 11B.

The overhanging portion -20 formed at 11G can also be joined to the cut and raised piece 59 formed at the bottom of the rear plate 57 @58 in the same manner. The joined state is shown in FIG. 10 in a partially cutaway sectional view.

By the way, in this embodiment, as shown in the partially cutaway cross-sectional view in FIG. is formed. Therefore, as is clear from FIG. 11, the joint portion is located closer to the cylindrical body portion 6 than the tip of the bent piece 57a formed around the rear plate 57, so that the front plate 5 also As shown in FIG. 11, the mold 61 disposed between the front plate 5 and the rear plate 57 is provided so that the joint portion is located closer to the cylindrical body than the bent piece 5a of the front plate 5. It can be seen that (indicated by a one-dot chain line) can be easily removed in the direction of arrow A after bonding.

Therefore, in this embodiment, even if the front plate 5 and the rear plate 57 that serve as the front plate and rear plate of the outer box are used, that is, the front plate 5 and the rear plate 5 having bent pieces 5a and 57a on the periphery.
7, the front plate 5, top plate 8, body plate 9, and rear plate 7 can all be joined almost simultaneously by curling. Therefore, it can be seen that the number of component parts can be reduced and the efficiency of the joining operation can be dramatically improved.

In addition, in the above explanation, the connection between the overhanging portion 20 formed in #green at the rear of the top plate 8 and the cut and raised piece 59 of the rear plate 57 was explained, but each overhang formed on the rear end stock of the body plate 9 was explained. part 2
0 and the cut and raised piece 59 of the rear plate 57 are also joined in the same manner.

Wind 11LL As described above, according to the present invention, the vicinity of the joint portion of the front plate and the rear plate with the cylindrical chest is closer to the cylindrical body than the tip of the bent piece formed around the front plate and the rear plate. to be located in
The joint portions of the front plate and the rear plate with the cylindrical body are formed by recessing from the main surfaces of the front plate and the rear plate toward the cylindrical 11 part side, and the front plate, the cylindrical body and the tF rear Since the plates are joined by curling, it is possible to obtain an inexpensive inner box for a cooking VA that has a small number of parts and can be efficiently produced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a microwave oven to which the present invention is applied. 2 is a perspective view schematically showing an example of the inner box of the microwave oven shown in FIG. 1. FIG. Figure 3 shows
FIG. 3 is a partially cutaway perspective view showing the joint structure of the inner box shown in FIG. 2; FIG. 4 is an exploded perspective view for explaining the process of joining the inner box shown in FIG. 3. FIG. 5 is a partially cutaway sectional view for explaining problems when joining the inner boxes shown in FIGS. 3 and 4. FIG. FIG. 6 is an exploded perspective view for explaining the process of joining an embodiment of the present invention, and corresponds to FIG. 4. FIG. 7 is a view of the rear plate of the embodiment shown in FIG. 6, viewed from the dipping direction. 8 and 9 are partially cutaway sectional views showing the process of joining the top plate and the rear plate in the embodiment shown in FIGS. 6 and 7. FIG. FIG. 11 is a partially cutaway cross-sectional view showing the joint portion of the embodiment described with reference to FIGS. 9 to 9. FIG. It is a partially cutaway sectional view for explaining the process. In the figure, 1 is a microwave oven as an example of 111 equipment, 4 is an internal phase, 5 is a front plate, 6 is a cylindrical body, and 8 is a cylindrical chest. , 9 is a printing plate that constitutes the cylindrical body, 10 is an opening in the front plate, 20 is an overhanging portion that is arranged between the top plate and the body plate and joins with the rear plate; 57 is a rear plate, 59 is a cut and raised piece of the rear plate to be joined to the cylindrical body. Patent applicant Enami Seitsuki Co., Ltd. Figure 1 Figure 2 Atsushi 7 Figure 10 Figure 8 Figure 9 Kudzu 110

Claims (1)

[Scope of Claims] A front plate having an opening, a cylindrical body having one end joined to the opening of the front plate, and a rear plate joined to the other end of the cylindrical body; In the inner box of the cooking appliance, in which bent pieces are formed around the plate and the rear plate, each of which is bent from the main surface in the direction of the cylindrical body, the front plate and the rear plate of the front 11a. The joint portions of the front plate and the rear plate with the cylindrical body portion are connected to the front plate and the rear plate such that the vicinity of the joint portion with the cylindrical body portion is located closer to the cylindrical chest than the tip of the bent piece. It is formed by recessing from the main surface of the rear plate toward the cylindrical body, and the front plate, the cylindrical body, and the rear plate are joined by a curling process.
Inner box of W equipment.