JPH0412492A - Door of microwave oven - Google Patents

Abstract

PURPOSE:To efficiently do the work of welding a contact plate and paired hinge plates to the door plate of a microwave oven by forming a mounting piece bent at an angle of 90 degrees to a main plate on the hinge plates, engaging the bent mounting- piece with a recessed portion formed on the external face of the bottom part of a choke groove in the door plate to be welded together and at the same time equalizing the welded direction of each of the hinge plates with that of the contact plate. CONSTITUTION:In order to weld a contact plate 17 and a pair of hinge plates 18 to a door plate 16, the door plate 16 is first set in such a condition to be laid on its side and then a mounting piece 18b is engaged with a recessed portion 20 temporarily positioned together in such a manner that a main plate 18a for the pair of hinge plates 18 may be applied to the upper and lower peripheral faces of a chock groove 19. Thereafter the arm of a welder is allowed to go down, and accordingly a pair of pins mounted onto the arm 21 are inserted respectively into the hinge plates 18, small holes 18d and 20a in the recessed portion 20 so as to give normal positioning of each of the hinge plates 18 to the door plate 16, and accordingly the hinge plates 18 are respectively spot-welded to the bottom part of the recessed portion 20 by means of a movable electrode and a stationary electrode.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is an electronic device which has been improved so that a contact plate and a hinge plate can be fixed to a door plate by spot welding from the same direction. Regarding the microwave door.

(Prior Art) Conventionally, in the door of a microwave oven, the door main body includes a door plate 2 having a choke groove 1 formed along the outer periphery on the back side, and a door plate 2, as shown in FIGS. 7 to 9. A contact plate 3 is fixed to the back side of the plate 2 by welding so as to close the inner circumferential side of the choke groove 1, and one end side is fixed to the door plate 2 by welding, and the other end side is attached to the main body of the microwave oven and can be opened and closed by a shaft 4. It is composed of a pair of hinge plates 5 that are rotatably supported.

When the contact plate 3 is closed, it comes into contact with the periphery of the front opening (opening of the heating chamber) of the main body of the microwave oven, and prevents the microwave from leaking out from the heating chamber. If there is a gap between the microwave oven 3 and the peripheral edge of the front opening of the main body and microwave leaks from the gap, it is attenuated in the choke groove 1.

In such a door body, the contact plate 3 and the hinge plate 5 are conventionally welded to the door plate 2 by welding the hinge plate 5 to the outer peripheral surface of the choke groove 1, as shown in FIGS. 7 and 10. Spot welding is carried out on both the upper and lower sides of one end of the door plate 2 from the direction of the arrow, and for the contact plate 3, the contact plate 2 is stacked on the back side of the door plate 2, and the inner peripheral edge of the choke groove 1 is welded with the arrow ''. There was spora, welding, and contact from the direction of mark B. In addition, in FIG. 10, 6 and 7 are arms of a spot welding machine equipped with electrodes.

(Problem to be Solved by the Invention) However, conventionally, the hinge plate 5 is spot welded to both the upper and lower outer peripheral surfaces of the choke groove 1, whereas the contact plate 3 is spot welded to the back surface of the door plate 2. , the welding direction of the hinge plate 5 and the welding direction of the contact plate 3 differ by 90 degrees.

On the other hand, since the electrode of a spot welder normally operates in the vertical direction, the door plate 2 is set in an upright position when welding the hinge plate 5, and the door plate 2 is placed on its side when welding the contact plate 3. There is a problem in that the orientation of the door plate 2 must be changed by 90 degrees when welding the hinge plate 4 and when welding the contact plate 3, which increases the number of man-hours. Ta.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a microwave oven door in which the contact plate and the hinge plate can be welded from the same direction, and there is no need to change the orientation of the door plate during each welding process.

[Structure of the Invention] (Means for Solving the Problems) The microwave oven door of the present invention is provided with a door plate having a choke groove formed along the outer periphery on the back side, and the inner periphery side of the choke groove is closed. A contact plate fixed by welding is provided on the inner peripheral edge of the choke groove, and recesses are formed on both upper and lower sides of one end of the door plate on the bottom outer surface of the choke groove. It has a main plate rotatably supported via a shaft and a mounting piece formed by bending 90 degrees with respect to the main plate, and the mounting piece is fitted into the recess and fixed to the bottom of the recess by welding. It is equipped with a pair of hinge plates.

(Function) The inner edge of the choke groove to which the contact plate is welded and the bottom of the choke groove to which the hinge plate is welded are both on the door plate.
Since the front-rear direction is the plate thickness direction, the contact plate and the hinge plate can be welded from the same direction.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 6.

First, as shown in FIG. 6, the microwave oven has a heating chamber 12 formed within a main body 11, and a front opening of this heating chamber 12 is opened and closed by a door 13. This door 13 is
The door body 14 shown in FIGS. 1 to 3 and the door body 1
4 and a door frame 15 attached to the front side. Note that a translucent barrier 15a is attached to the door frame 15.

Now, the door body 14 shown in FIGS. 1 to 3 includes a rectangular door plate 16, a rectangular contact plate 17 smaller in circumference than the door plate 16, and a pair of upper and lower hinge plates 18 (only one (as shown in the figure).

A rectangular opening 16a is formed in the door plate 16, and a choke groove 19 recessed in a substantially U-shape along the outer periphery is formed on the back side around the opening 16g.

As shown in FIG. 5, recesses 20 (only one side is shown) are formed on one end side of the bottom outer surface (corresponding to the front side of the door plate 16) of this choke groove 19, for example, on both upper and lower sides of the left end side. , two small holes 20a are provided at the bottom of this recess 20.
is formed.

On the other hand, a contact piece 17a that comes into contact with the front opening periphery of the heating chamber 12 of the main body 11 is formed on the outer peripheral portion of the contact plate 17, and a portion surrounded by this contact piece 17g, that is, an opening 16a of the door plate 16. Numerous small holes 17.a are formed in the portion corresponding to .

Further, as shown in FIG. 5, the pair of hinge plates 18 includes a main plate 18g, a mounting piece 18b formed by bending 90 degrees at one end of the main plate 18a, and a projecting portion from the other end of the main plate 18a. The door plate 1 is attached to the mounting piece 18b.
A small hole 18d corresponding to the small hole 20a of the recess 2o of No. 6 is formed.

Now, in order to weld the contact plate 17 and the hinge plate 18 to the door plate 16, first, the door plate 16 is laid down horizontally, and the main plates 1.8a of the pair of hinge plates 18 are attached to the upper and lower outer peripheries of the choke groove 19. Place the mounting piece 18b in the recess 2 so that it is facing the surface.
0 and perform temporary positioning. Then, the arm 21 of the welding machine shown in FIG. The plate 18 is properly positioned, and in this state, the hinge plate 18 is spot welded to the bottom of the recess 20 using a movable electrode attached to the arm 21 and a fixed electrode (not shown).

Next, the door plate 16 is placed on top of the contact plate 17 which is lying on its side, and both are positioned so that the inner peripheral side of the choke groove 19 is closed by the contact piece 17a of the contact plate 17. Then, instead of the arm 21, another arm 22 attached to the welding machine is lowered to intermittently spot-weld the contact plate 17 to the inner peripheral edge of the choke groove 19 of the door plate 16.

After constructing the door body 14 by welding the contact plate 17 and the hinge plate 18 to the door plate 16 as described above, the door frame 15 is
is attached and assembled to the door 13, and the shaft 18C of the hinge plate 18 is inserted and supported in bearings (not shown) provided on both upper and lower sides of the left end side of the main body 11, so that the door 13 can be rotated to open and close on the main body 11. It is to be attached to.

In this way, according to this embodiment, the main plate 18 of the hinge plate 18
Since the mounting piece 18b is bent at right angles to a and is welded to the bottom outer surface of the choke groove 19, the welding direction of the hinge plate 18 can be the same as the welding direction of the contact plate 17. can. Therefore, the contact plate 17 and the hinge plate 18 can be welded with one welding machine, and there is no need to change the direction of the door plate 16, so welding can be performed efficiently.

Moreover, since the mounting piece 18b is not fixed to the outer peripheral edge of the choke groove 19, but is fixed to the approximately U-shaped portion where the strength is increased, the entire door 13 is supported by the shaft 18c. When this happens, there is no risk of the fixed portion of the hinge plate 18 deforming, and since the recess 20 is formed in the door plate 16 and the mounting piece 18b of the hinge plate 18 is fitted into this recess 20, the temporary fixing of the hinge plate 18 is prevented. Positioning is possible and welding work efficiency is improved.

[Effects of the Invention] As is clear from the above description, according to the present invention, a mounting piece that is bent at 90 degrees with respect to the main plate is formed on the hinge plate, and this bent piece is formed on the outer surface of the bottom of the choke groove of the door plate. By fitting into the recessed part and welding, the welding direction of the hinge plate can be made the same as the welding direction of the contact plate.
Not only can the contact plate and hinge plate be welded with one welding machine, but there is no need to change the direction of the door plate 90 degrees when welding the contact plate and hinge plate, and the mounting piece can be placed in the recess. By fitting, the hinge plate can be temporarily positioned, which has the excellent effect of making welding work more efficient.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention,
Figure 1 is a vertical side view of the main part, Figure 2 is a rear view of the main part,
Fig. 3 is a plan view of the main parts, Fig. 4 is a plan view showing the state during welding, Fig. 5 is an exploded perspective view of the Se=-Yumi-←Hide door plate and hinge plate, Fig. 6 The figure is a perspective view of a microwave oven. In addition, FIGS. 7 to 10 show conventional examples, respectively.
FIG. 4 is a diagram corresponding to FIG. In the figure, 11 is the main body of the microwave oven, 12 is the heating chamber, 13 is the door, 14 is the door body, 16 is the door plate, 17 is the contact plate, 18 is the hinge plate, 18a is the main plate, 18b is the mounting piece, and 18c is the The shaft, 19 is a choke groove, and 20 is a recess. Applicant: Toshiba Corporation

Claims (1)

[Claims] 1. A door plate with chalk grooves formed along the outer periphery on the back side,
a contact plate fixed to the inner peripheral edge of the choke groove by welding so as to close the inner peripheral side of the choke groove and abutting the front opening peripheral edge of the microwave oven body; and a contact plate on the bottom outer surface of the choke groove. It has a recess formed on both upper and lower sides of one end of the door plate, a main plate rotatably supported by the main body of the microwave oven via a shaft, and a mounting piece formed by bending 90 degrees with respect to the main plate. A door for a microwave oven, comprising a pair of hinge plates that fit the mounting piece into the recess and are fixed to the bottom of the recess by welding.