JPH049527A - Door for electronic oven - Google Patents

Abstract

PURPOSE:To improve the assembling and welding work and facilitate the automation of assembling by fitting a welder jig in two fitting recessed proportions of a hinge plate, and positioning a main plate part of the hinge plate to a plate part among door body plates directed substantially parallely to a predetermined surface part. CONSTITUTION:A door inner plate 24 is of a rectangular shape, and a frame part 24b comprising a hole free plate part 24b comprising is formed around a porous plate part 24a. The door inner plate 24 is fused to a predetermined surface part fused to a prescribed surface part 23c. Hinge plates 27, 28 are fused to two adjacent corner parts of the periphery of the door body plate 23. Further, a position fit hole 29 is formed in the door body plate 23 at two locations of a deep wall part 26a of a chalk groove 26. Further, a welding jig 30 includes a rectangular box-shaped body 30a, positioning shafts 30b, 30c protruded at the adjacent two corners, and positioning shafts 30d protruded at two locations of the bottom. Then, the fit hole 29 of the door body plate 23 is fitted to the positioning shaft 30d. Hereby, to a flat plate part 23b of the door body plate 23.

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention is constructed by attaching a hinge plate to a door body plate,
The present invention relates to a microwave oven door that is pivotally installed on the microwave oven main body via this hinge plate.

(Prior Art) Conventionally, in a microwave oven, a door 2 is attached to a microwave oven main body 1, as shown in FIG. This door 2 has an inner door plate 4 welded to the back side of a door main plate 3, and
It is constructed by attaching a frame 5 to the periphery of the door body plate 3.

The door body plate 3 has a rectangular overall shape,
As shown in FIGS. 5 to 7, the outermost periphery is bent into an L-shape, and a well-known concave choke groove 6 for attenuating microwaves is formed in a portion closer to the inner periphery. At the two adjacent corners of this door body plate 3 (see Fig. 6),
Hinge plates 8 (only one is shown) each having a shaft insertion hole 7 are attached. Specifically, this hinge plate 8
is welded to the side plate 3a (side H1 of the choke groove 6) of the door body 3, and in order to position the hinge plate 8 to the side plate 3a, three positioning holes 9 are provided. is formed. Positioning is performed by fitting a bottle of a welding jig (not shown) into this hole 9. In addition, three positioning holes 10 are formed in the side plate part 3a of the door body 3 in the same arrangement as the positioning holes 9, and when positioning the hinge plate 8, a bottle of a welding jig is inserted into these holes 1o. , and the door body 3 is also positioned.

Spot welding is usually used to weld the hinge plate 8 to the door body 3, but in this case, the hinge plate 8 is attached to the seventh
Spot welding is performed from the direction shown by arrow A in the figure. Note that the door inner plate 4 is not welded at this time of welding, and after the hinge plate 8 is welded, the choke groove 6 is welded as shown in FIG.
It is placed on a predetermined surface portion 3b of the door body plate 3 and welded by spot welding so as to close a part of the door body plate 3.

Therefore, this door 2 has a shaft insertion hole 7 of each hinge plate 8.
It is pivotally installed in the microwave oven main body 1 via a shaft 11 (see FIG. 6) that passes through the microwave oven body 1 .

(Problems to be Solved by the Invention) However, in the conventional structure described above, the hinge plate 8 is welded to the side plate portion 3a of the door main body 3, so the welding work is troublesome. In other words, the parts of the door of a microwave oven are generally joined by spot welding, but in this case, the direction of welding to the main structural members such as the inner door plate 4 (the direction in which the welding electrodes butt together) is as follows:
This is the direction shown by arrow B in FIG. 7 (the direction perpendicular to the predetermined surface portion 3b). On the other hand, the welding direction for the hinge plate 8 is a direction different from the above-mentioned arrow B, that is, a direction perpendicular to the above-mentioned arrow B (indicated by arrow A), and welding workability is poor. Since it is perpendicular to the direction of arrangement with respect to the main body 3 (the same direction as the arrow S), it is difficult to assemble it, and as a result, it is not easy to automate the assembly.

The present invention has been made in view of the above circumstances, and its purpose is to provide a door for a microwave oven that can improve assembly and welding operations and facilitate automation of assembly.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a door body plate having a rectangular overall shape, a door inner plate disposed on a predetermined surface of the door body plate and welded to the door body plate, and the door body plate having a rectangular overall shape. A hinge plate is welded to two adjacent corners of the door body plate and each has a shaft insertion hole. The hinge plate extends from the main plate part in an angular relationship substantially orthogonal to each other, and the main plate part is welded to a plate part of the door body plate that is substantially parallel to the predetermined surface part. and two pieces having the shaft insertion hole, and a fitting recess is formed at the extending end of each piece for positioning the main plate part to the substantially parallel plate part. It has the following characteristics.

(Function) The two fitting recesses of the hinge plate are fitted with the welding jig, and the main plate portion of the hinge plate is positioned with the plate portion of the door body plate that is substantially parallel to the predetermined surface portion.

In this case, since the fitting recesses are orthogonal to each other, there is no positional deviation in two-dimensional directions.

Since the main plate part, which is the welding part of the hinge plate, is welded to the plate part of the door body plate that is almost parallel to the predetermined surface part, the welding direction is the positioning direction of the door inner plate with respect to the door body and the welding direction. The same direction as .

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 4, a door 22 is rotatably mounted on a microwave oven main body 21, and this door 22 roughly consists of:
The door inner plate 24 is welded to the back surface of the door body plate 23, and a frame 25 is attached to the periphery of the door body plate 23.

Now, as shown in FIG. 1, the door main body plate 23 has a rectangular frame shape as a whole, and the outermost peripheral edge is bent into an L shape from the bent plate part 23a and the flat plate part 23b,
A well-known concave choke groove 26 for attenuating microwaves is formed in a portion closer to the inner periphery.

Further, the door inner plate 24 has a rectangular shape, and the perforated plate portion 24
A frame portion 24b made of a non-perforated plate portion is formed around a. As will become clear from the description below, this door inner plate 24 is welded to a predetermined surface portion 23c (in this case, the surface portion on the inner peripheral side) of the door body 23.

The hinge plates 27 and 28 are attached to two adjacent corners (in FIG. 4, the upper and lower corners, the first
In the figures and FIG. 2, the hinge plates 27 and 28 are welded to the front and rear corners), and the hinge plates 27 and 28 are symmetrical. Now, the hinge plate 27 will be described as a representative.

This hinge plate 27 is a portion of the door body plate 23 that is substantially parallel to the predetermined surface portion 23C, in this case, the flat plate portion 2
The main plate part 27a is welded to the main plate part 3b, and two pieces 27b and 27c extend downward in FIG. has been done. A shaft insertion hole 27d is formed in one piece 27b. Furthermore, each piece 27b, 2
The main plate part 27a is connected to the flat plate part 2 at the extending end of the main plate part 7c.
Fitting recesses 27e and 27f are formed for positioning 3b. In this case, since the pieces 27b and 27c are orthogonal to each other, the fitting recesses 27e and 27f are also orthogonal to each other. In addition, in the other hinge plate 28, the same subscripts are attached to the same parts as those of the hinge plate 27.

Further, in the door body plate 23, two positioning fitting holes 29 (only one shown) are formed in the rear wall portion 26a of the choke groove 26.

The door inner plate 24 and hinge plates 27 and 28 are the door main plate 2.
3 is welded by spot welding, and the welding procedure will be described below. First, regarding the welding jig 30, this welding jig 30 has a rectangular box-shaped main body 30a with an open top surface, and an angular relationship that is perpendicular to two adjacent corners of this main body 30a. A protruding positioning shaft 30b.

30c, and positioning shafts 30d protruding from two locations on the bottom of the main body 30a.

Therefore, first, the fitting recess 27e of the hinge plate 27.28
, 27f, 28e, and 28f, respectively, are connected to the respective positioning axes 30.
b, fits into 30c. In this case, the fitting recesses 27e, 2
7f are perpendicular to each other, so the movement of the hinge plate 27 in the two-dimensional direction is restricted. The same applies to the hinge plate 28.

Next, the fitting holes 29 of the door body plate 23 are aligned with each positioning shaft 30d.
Fits in.

As a result, the hinge plates 27 and 28 are positioned relative to the flat plate portion 23b of the door body plate 23. In this case, as described above, since the movement of each hinge plate 27, 28 in two-dimensional directions is restricted, the positioning accuracy is good.

Thereafter, the door inner plate 24 is placed on the predetermined surface portion 23c of the door body plate 23 from the direction of the arrow U in FIG.
, 28a are welded to the flat plate portion 23b of the door body 23 by spot welding. These welding directions are the directions of arrows v and W in FIG. 3, respectively. As is clear from the above description, the direction in which the door inner plate 24 is arranged relative to the door body 23 and the direction in which the door inner plate 24 and hinge plates 27 and 28 are welded to the door body plate 23 are all in the same direction. As a result, according to this embodiment, it is possible to improve assembly and welding operations, and automation of assembly is also facilitated.

The door 22 manufactured in this way has each of the hinge plates 2
It is pivotally installed in the microwave oven main body 21 via shafts 31 (see FIG. 2) passed through shaft insertion holes 27d of 7.28.

In particular, according to this embodiment, the door body 2 with respect to the welding jig 30
The fitting hole 29 for positioning in step 3 is inserted into the door body 2.
3, it is formed on the back wall part 26a of the choke groove 26, which is a plate part that is almost parallel to the predetermined surface part 23c, so that it is possible to perform the hole drilling process at the same time as the drawing process of the door body 23 using a press. Manufacturability is improved compared to the conventional method in which holes are formed in the side wall in post-processing.

[Effects of the Invention] As is clear from the above description, the present invention comprises a door body plate having a rectangular overall shape, a door inner plate placed on a predetermined surface of the door body plate and welded thereto, and the door. A hinge plate is welded to two adjacent corners of the main body plate and each has a shaft insertion hole, and is pivotally mounted to the microwave oven main body via a shaft passed through each of the shaft insertion holes of the hinge plate. wherein the hinge plate is welded to a plate portion of the door body plate that is substantially parallel to the predetermined surface portion, and the hinge plate extends from the main plate portion in an angular relationship substantially orthogonal to each other; It is composed of two pieces having the shaft insertion hole, and
A fitting recess is formed at the extending end of each of the pieces for positioning the main plate to the substantially parallel plate, which facilitates assembly and welding operations. The assembly can be easily automated, and the positioning performance can also be improved.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
FIG. 1 is an exploded perspective view of the door, FIG. 2 is a perspective view of the main part of the door, FIG. 3 is a sectional view of the main part, and FIG. 4 is a perspective view of the microwave oven. Figures 5 to 8 show conventional examples, where Figure 5 is an exploded perspective view of the main parts, Figure 6 is a perspective view of the main parts, Figure 7 is a sectional view of the main parts, and Figure 8 is a cross-sectional view of the main parts. This is a diagram equivalent to Figure 4. In the drawing, 21 is the range body, 22 is the door, 23 is the door body,
23b is a flat plate portion (a plate portion substantially parallel to the predetermined surface portion), 23c
2 is a predetermined surface portion, 24 is a door inner plate, 27 is a hinge plate, 27a is a main plate portion, 27b and 27c are pieces, 27d is a shaft insertion hole, 2
7e and 27f are fitting recesses, 28 is a hinge plate, 28m is a main plate portion, and 28b. 28c is a piece, 28d is a shaft insertion hole, 28e and 28f are fitting recesses, and 31 is a shaft. Applicant: Toshiba Corporation

Claims (1)

[Claims] 1. A door body plate having a rectangular overall shape, a door inner plate placed on a predetermined surface of the door body plate and welded thereto, and a door inner plate welded to two adjacent corners of the door body plate and each having a shaft inserted therein. A hinge plate having a hole formed therein and pivotally installed on the microwave oven main body via a shaft passing through each of the shaft insertion holes of the hinge plate, wherein the hinge plate is connected to the door main body plate through the shaft through the shaft insertion hole. Consisting of a main plate part welded to a plate part substantially parallel to a predetermined surface part, and two pieces extending from the main plate part in an angular relationship substantially orthogonal to each other and having the shaft insertion hole on one side. A door for a microwave oven, characterized in that a fitting recess for positioning the main plate part to the substantially parallel plate part is formed at the extending end of each of the pieces.