JPH0869876A - Door body of high-frequency heating apparatus - Google Patents

Abstract

PURPOSE: To reduce equipment cost by forming extendedly arranged parts for spot welding on both ends of boards of slit metal fittings. CONSTITUTION: Slit metal fittings 22 are installed on a bottom surface of a choke groove 5 of a main body panel 1 by spot welding. Extendedly arranged parts 29 for spot welding exist on both ends of boards 23, and are fixed to a bottom surface of the groove 5 by spot welding. Locking holes 30 are formed in first bending parts 27, and a shielding part is bent at a proper angle in the outside direction of the panel 1 in a specific height from the bottom surface of the groove 5, that is, in an end position of a slit 25, and a wall plate 24 has an oblique angle to the depth direction of the groove 5. When the boards 23 are fixed to the bottom surface of the groove 5 by spot welding, the extendedly arranged parts 29 become a spot margin. Therefore, since boring and insulating processing for a welding electrode becomes unnecessary, production manhours are reduced, and equipment cost is reduced, and since an unnecessary contact short circuit is not caused, the service life of the welding electrode is lengthened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door of a high frequency heating device such as a microwave oven.

[0002]

2. Description of the Related Art Conventionally, there is a door body of a high frequency heating apparatus of this type, which is constructed as shown in FIGS. 4 to 6 in order to prevent radio wave leakage. In those drawings, 1
Is a metal main body panel that opens and closes the front opening of the cooking cabinet in a freely openable and closable manner, and 2 is a punching hole formed in the central portion of the main body panel 1 for preventing electric wave leakage.

Reference numeral 3 denotes a translucent rear panel provided on the rear side of the central portion of the main body panel 1, the peripheral portion of which is adhered to the main body panel 1 by an adhesive material 4 from an air punching hole 2 in the cooking cabinet. To prevent the outflow of heat and keep the cooking cabinet warm. Reference numeral 5 denotes a choke groove for preventing electric wave leakage, which is formed by bending the peripheral portion of the main body panel 1, and is open toward the back surface of the main body panel 1.

Reference numeral 6 is a slit metal fitting provided on each side of the choke groove 5 along the choke groove 5 for preventing electric wave leakage, and 7 is a substrate of the slit metal fitting 6, both ends of which are shown by a mark in FIG. Are spot-welded to the bottom surface of the choke groove 6.

Reference numeral 8 denotes a wall plate formed by bending the outer edge of the substrate 7 at right angles to the opening direction of the choke groove 5, and 9 denotes a plurality of portions of the wall plate 8 as shown in FIG. The slits are formed by cutting out in the depth direction, and their dimensions and the like are set in consideration of the frequency (wavelength) of leaked radio waves.

Reference numeral 10 denotes a shield portion formed between both ends of the wall plate 8 and the adjacent slits 9. Reference numeral 11 denotes a first portion formed by bending the tip end portion of the shield portion 10 at a right angle to the inside of the main body panel 1. Reference numeral 1 is a bent portion, and 12 is a second bent portion formed by bending the front end portion of the first bent portion 11 at a right angle in the direction of the substrate 7.

Reference numeral 13 is a first bent portion 11 at both ends of the wall plate 8.
Square hole for welding electrode formed in the
Locking hole formed in the bent portion 11 of the choke groove 15
Is a choke dielectric that covers the opening of the above-mentioned, and the locking claws at a plurality of positions are locked in the locking holes 14.

Reference numeral 16 denotes a side surface cover body at the peripheral portion of the main body panel 1, 17 denotes a translucent front panel of the main body panel 1,
The peripheral edge portion is fitted into the locking groove 18 of the side surface cover body 16. Reference numeral 19 denotes a translucent front cover body provided on the front surface of the front panel 17.

When attaching the slit metal fitting 6, a plurality of places including both ends of the substrate 7 are spot-welded to the bottom surface of the choke groove 5 by abutting the tip of the welding electrode 20 on the opening side surface of the choke groove 5. To be done. The mark 7 in FIG.
The welding points of are shown.

At this time, since the upper portions of both end portions of the substrate 7 are covered with the first bent portion 11, a square hole 13 is formed in the first bent portion 11 and is shown in FIG. As described above, spot welding is performed by the welding electrode 20 inserted in the square hole 13.

By the spot welding of the both ends, the slit metal fitting 6 is brought into close contact with the bottom surface of the choke groove 5, that is, the main body panel 1, and the performance of preventing radio wave leakage due to the gap between the slit metal fitting 6 and the main body panel 1 is deteriorated. Is prevented. By the way, the welding electrode 20 is coated with, for example, an insulating film 21 on its side surface, as shown in FIG. 5, in order to prevent an unnecessary contact short circuit with the edge of the square hole 13 or the like.

[0012]

In the case of the conventional door body shown in FIGS. 4 to 6, when the slit metal fitting 6 is attached to the bottom surface of the choke groove 5 of the main body panel 1, especially the substrates 7 at both ends are spot-welded. The first bent portion 1 that covers the upper part of the
1. A large square hole 13 into which the welding electrode 20 is to be inserted must be formed in the welding electrode 1, and the insulating treatment film 2 is formed on the welding electrode 20.
It is also necessary to perform an insulation treatment such as formation of 1.

Therefore, there is a problem that not only the number of man-hours for production is increased, but also the equipment cost for production is high and it cannot be formed inexpensively. Moreover, since the welding electrode 20 easily contacts the square hole 13 and the like, there is a problem that the life of the welding electrode 20 is shortened due to unnecessary contact short-circuiting.

Further, since the welding electrode 20 is surely brought into contact with the substrate 7 through the square hole 13, the wall plate 8 of the slit metal fitting 6 must be perpendicular to the substrate 7 and the square hole 13 must be held parallel to the substrate 7. As a result, it is impossible to adjust the attachment state (angle) of the slit fitting 6 to adjust the prevention performance of radio wave leakage.

For this reason, when a situation occurs in which desired radio wave leakage prevention performance cannot be obtained during mass production due to slight dimensional deviation from the time of trial manufacture, differences in materials, etc., the slit metal fitting 6 is remade by changing the dimensions or the like. However, there is a problem that it is necessary to modify the mold for that purpose, and the production plan is delayed.

Further, the slit fitting 6 must be prepared for each model even when the dimensions and the like are slightly different, and there is a problem that parts cannot be shared among a plurality of models.

According to the present invention, spot welding of both ends of a slit fitting for preventing electric wave leakage can be performed without forming a conventional square hole for a welding electrode or insulating a welding electrode.
The objective is to reduce the production equipment cost and extend the life of the welding electrode. It is also an object to adjust the mounting state of the slit metal fittings and to adjust the radio wave leakage prevention performance and standardize parts.

[0018]

In order to achieve the above object, in the door of the high-frequency heating apparatus of the present invention, an extension portion for spot welding is provided at both ends of the base plate of the slit fitting for preventing radio wave leakage. To form. Further, in order to adjust the mounting state of the slit metal fitting, the wall plate of the slit metal fitting is inclined at an angle to the depth direction of the choke groove.

[0019]

In the case of the door body of the high-frequency heating apparatus of the present invention constructed as described above, when the slit metal fitting for preventing electric wave leakage is attached to the bottom surface of the choke groove of the main body panel by spot welding, especially at both end portions thereof. Spot welding is performed at the extension formed for each spot welding.

At this time, since the upper portion of the extended portion is not covered with the first bent portion or the like, spot welding can be performed without forming a square hole for a welding electrode and insulating treatment of the conventional welding electrode. .

Further, since the conventional square holes are not required to be formed, the wall plate of the slit metal fitting can be obliquely angled with respect to the depth direction of the choke groove. The mounting state can be changed, the radio wave leakage prevention performance can be adjusted, and parts can be shared.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. In these drawings, the same reference numerals as those in FIGS. 4 to 6 indicate the same or corresponding ones. The difference from FIGS. 4 to 6 is that the slit metal fitting 22 is spot-welded instead of the conventional slit metal fitting 6. 1 is attached to the bottom surface of the choke groove 5.

The slit fitting 22 is similar to the board 7, the wall plate 8, the slit 9, the shield 10 and the first and second bent portions 11 and 12 of the conventional fitting 6 in the conventional fitting 6 and the wall plate 2.
4, the slit 25, the shielding portion 26, and the first and second bent portions 27 and 28, and the conventional metal fitting 6 and the following (i) to (iii)
Are different.

(I) An extended portion 29 for spot welding is formed at both ends of the substrate 23, and the extended portion 29 is spot welded to the bottom surface of the choke groove 5.

(Ii) No holes such as the square holes 13 for welding electrodes at both ends of the conventional metal fitting 6 are formed, and the first bent portions 27 at a plurality of locations have the same engagement as the conventional engagement holes 14. The point where the stop hole 30 is formed.

(Iii) As shown in FIG. 2, at a position where each shield 26 has a constant height from the bottom surface of the choke groove 5, that is, at the position of the end of the slit 25, an appropriate angle .theta. A point where the wall plate 24 is bent and forms an angle with the depth direction of the choke groove 5.

When the board 23 of the slit metal fitting 22 is attached to the bottom surface of the choke groove 5 by spot welding, extended portions 29 as so-called "spot margins" are formed at both ends thereof. The extended portion 29 is spot-welded and attached as shown in FIG.

At this time, since the upper portion of the extending portion 29 is not covered with the first bent portion 27 or the like, the conventional square hole 13 or the like through which the welding electrode is inserted is not formed, and the extending portion 29 is slit. Spot welding is performed in the same manner as other welding points of the metal fitting 22.

Therefore, the conventional formation of holes such as the square hole 13 through which the welding electrode passes and the insulation treatment of the welding electrode are unnecessary and can be omitted, and the production man-hour is reduced and the production facility cost is reduced. . Moreover, since unnecessary contact short-circuiting of the welding electrode unlike the conventional case does not occur, the life of the welding electrode can be extended.

Further, since it is not necessary to hold the wall plate 24 at a right angle to the substrate 23, the wall plate 24 can be formed at an angle θ with respect to the depth direction of the choke groove 5, and this angle θ
Can be adjusted to change the mounting state of the slit metal fitting 22 to adjust the radio wave leakage prevention performance.

Therefore, the angle .theta. Can be changed to obtain desired electromagnetic wave leakage prevention performance without recreating the slit fitting 22 during mass production, and the cost required for mold correction and the like can be significantly reduced. It is possible to prevent delays in production planning.

Moreover, by adjusting the angle θ, it is possible to share the slit metal fitting 22 with the doors of a plurality of models to exhibit the desired electromagnetic wave leakage prevention performance, and it is possible to reduce the production cost by using common parts. There is also. The slit metal fitting 22
The intervals of the slits 25, the bending angle θ, etc. are not limited to those in the embodiment.

[0033]

Since the present invention is configured as described above, it has the following effects. First, since the extension portions 29 for spot welding are formed at both ends of the board 23 of the slit metal fitting 22, when the slit metal fitting 22 is attached to the bottom surface of the choke groove 5 of the main body panel 1 by spot welding, particularly, at both end portions thereof, Spot welding is performed in each extension portion 29, and at this time, since the upper portion of the extension portion 29 is not covered with the first bent portion 27 and the like, the conventional formation and welding of square holes for welding electrode insertion are performed. Spot welding can be performed by omitting the electrode insulation process, reducing the number of production steps and increasing the slit metal fitting 22.
Can be attached to the main body panel 1, the production facility cost can be reduced, and unnecessary contact short-circuiting of the welding electrode can be reduced to prolong the life of the welding electrode.

Further, when the wall plate 24 of the slit metal fitting 22 has an angle with respect to the depth direction of the choke groove 5, the mounting state of the slit metal fitting 22 is changed by the adjustment of this angle to prevent radio wave leakage. Since the adjustment can be performed, during the mass production, the mounting condition of the slit metal fitting 22 is adjusted so as to exhibit the desired radio wave leakage prevention performance, and the cost of the die modification of the slit metal fitting 22 is greatly reduced and the production plan Delays can be prevented.

Moreover, the slit fitting 22 can be commonly used to prevent radio wave leakage in a plurality of types of high frequency heating devices, and there is an advantage that parts can be shared.

[Brief description of drawings]

FIG. 1 is a rear view in which a choke dielectric according to an exemplary embodiment of the present invention is removed.

FIG. 2 is a partial cross-sectional view of FIG.

FIG. 3 is a partially cutaway perspective view of the slit fitting of FIG.

FIG. 4 is a rear view in which a choke dielectric of a conventional example is removed.

5 is a cross-sectional view for explaining attachment of the slit fitting of FIG.

6 is a partially cutaway perspective view of the slit fitting of FIG. 4. FIG.

[Explanation of symbols]

 1 Main Body Panel 5 Choke Groove 15 Choke Dielectric 22 Slit Metal Fitting 23 Substrate 24 Wall Plate 25 Slit 26 Shielding Part 27 First Bending Part 28 Second Bending Part 29 Extended Part

Claims (2)

[Claims] 1. A main body panel for opening and closing a front opening of a cooking cabinet so as to be openable and closable, and a choke groove for preventing electric wave leakage, which is formed in a peripheral portion of the main body panel so as to open toward a rear side of the main body panel. A slit metal fitting for preventing electric wave leakage is provided on each side of the choke groove for preventing electric wave leakage, and a choke dielectric covering the opening of the choke groove, wherein the slit metal fitting includes a plurality of ends. A substrate spot-welded to the bottom surface of the choke groove at a location, a wall plate formed by bending an outer edge of the substrate toward the opening direction of the choke groove, and a plurality of locations of the wall plate at the choke groove. A plurality of shields formed by notching slits in the depth direction, a first bent portion formed by bending each of the shields inward of the body panel, and the first fold The tip of the bent part is A door body of a high-frequency heating device having a second bent portion formed by bending in the bottom direction of the groove, wherein extension portions for spot welding are formed at both ends of the substrate. The door of the high frequency heating device. 2. The door body of a high frequency heating apparatus according to claim 1, wherein the wall plate is obliquely angled with respect to the depth direction of the choke groove.