JPS6336636Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a microwave oven door structure.

(B) Prior Art In FIG. 1, the conventional structure of a door 4 for opening and closing a front opening 3 of a heating chamber 2 disposed in a microwave oven main body 1 is as shown below.

As shown in FIG. 2, a metal door body 6 having a U-shaped cross section and a frame shape has a central opening 5 for looking into the heating chamber 2, and a flange 7 is formed around the central opening 5. A frame-shaped flat metal plate 9 having a plurality of screw holes 8, 8, . . . is spot welded to the flange (X locations). As shown in FIG. 3, a punching plate 10 that covers the central opening 5 and has a large number of small holes at locations corresponding to the opening (mesh pattern area) through which microwaves cannot pass is attached to the flat plate 9.
are fixed with screws 11, 11....

Therefore, the outer circumferential plane portion 1 of the punching plate 10
2 is adapted to come into contact with a front plate 3' on the periphery of the front opening 3 of the heating chamber 2 when the door 4 is closed. Further, the outer circumferential plane part 12 forms a wall space 13 together with the door main body 6, and the wall space, together with the contact between the outer circumferential plane part 12 and the front plate 3', prevents microwaves from flowing from the heating chamber 2 to the outside. Prevents leakage.

In addition, in FIG. 3, the chiyoke space 13 is covered with a dielectric cover (not shown), and a transparent inner door panel 14 made of polyester film is provided at the location where the small hole is formed on the inner surface of the punching plate 10. At the same time, a transparent outer door panel (not shown) made of acrylic resin is fixed to the outer surface of the door body 6.

Next, another conventional structure of the door 4 is shown in FIG. 4, in which the door main body 15 has a circumference 16 bent into a U-shaped cross section, and a central portion 17 with a large number of holes through which microwaves cannot pass. A small hole is drilled. A frame-shaped metal bending plate 18 is spot-welded (×
part) has been done. The outer periphery 19 of such a bent plate 18
Similar to the outer circumferential flat portion 12 of the punching plate 10, it comes into contact with the front plate 3' when the door 4 is closed, and forms a wall space 20 together with the door body 15.

Further, the chiyoke space 20 is covered with a dielectric cover (not shown). The inner edge 21 of the bending plate 18 is bent together with the center portion 17 of the door body 15 so that its cross section is U-shaped.
A rubber door packing 22 is disposed on the inner edge 21, and a transparent inner door panel 23 made of glass is press-fitted into the door body 15 and fixed by pressure. Further, a transparent outer door panel (not shown) made of acrylic resin is fixed to the outer surface of the door body 15.

Here, in any of the above structures, there is a spot welding process (x locations), which requires special equipment, and thus increases the cost of the door 4. Further, in FIG. 3, the inner door panel 14 is stuck and fixed to the punching plate 10, while in FIG. 4, the inner door panel 2 is fixed.
3 is fixed by crimping, and the state in which the panels are fixed is different.As a result, the door structures of the two are significantly different.Therefore, it is difficult to form most of the door parts for each door. Since a mold must be provided, it is not possible to sufficiently reduce costs when producing multiple types of microwave oven doors.

(c) Purpose of the invention The purpose of the invention is to reduce costs by making most of the door parts common to microwave oven doors whose inner door panels are fixed in different ways, that is, using the same mold for forming the door parts. There is a particular thing.

(d) Structure of the invention In order to achieve the above object, the structural features of the invention include a frame-shaped door body having a central opening, and a large number of small holes that cover the central opening of the door body and prevent microwaves from passing through. In a microwave oven door structure for opening and closing a heating chamber opening, the door structure includes a punching plate having a hole, and a transparent panel that closes a small hole in the punching plate, wherein a plurality of claws are formed on the periphery of the center opening of the door body, and A plurality of insertion holes corresponding to the pawls are formed in the punching plate, and the punching plate is attached to the door body so that the pawls are inserted into the insertion holes, and the pawls are bent. The punching plate is fixed to the door body, and the punching plate is further provided with a panel fixing device for fixing the transparent panel when the nail is bent. The reason lies in the fact that the division was formed.

(e) Examples The structure of the door 4 according to an embodiment of the present invention will be explained below.

As shown in FIG. 5, in a metal door body 25 having a U-shaped cross section and a frame-like shape and having a central opening 24 for looking into the heating chamber 2, a flange 26 on the periphery of the central opening 24 is folded toward the heating chamber 2 side. It is curved,
A plurality of claws 28, 28, . . . are formed at regular intervals on the flange bent portion 27. Also, the 6th
As shown in the figure, in a punching plate 29 for covering the central opening 24, a large number of small holes through which microwaves cannot pass are bored in locations corresponding to the central opening 24 (mesh-patterned portion), and the punching plate 29 is provided with a large number of small holes through which microwaves cannot pass. 28,
A plurality of insertion holes 30, 30 corresponding to 28...
...is being formed.

As shown in FIG. 7, the insertion opening 30,
Attach the punching plate 29 to the door body 25 so that the claws 28, 28... pass through the holes 30, and then insert the claws 28, 28... into the door body 25.
By bending in the direction of the outer edge 31 and pressing the flange 26 of the door body 25 with the tip of the claw,
The punching plate 29 is simply and firmly fixed to the door body 25. After such fixing, the door body 25 and the punching plate 29 are painted at the same time.

Therefore, the outer circumferential plane portion 2 of the punching plate 29
As in the conventional case, 9' contacts the front plate 3' at the periphery of the front opening 3 of the heating chamber 2 when the door is closed, and further forms a wall space 32 together with the door body 25.
Since the punching plate 29 is firmly fixed to the door body 25, microwaves are significantly prevented from leaking from the chiyoke space 32 to the outside through the gap between the punching plate 29 and the door body 25. .

Further, in FIG. 7, the chiyoke space 32 is covered with a dielectric cover (not shown), and a transparent inner door panel 33 made of a polyester film is placed on the inner surface of the punching plate 29 where the small hole is formed. is adhered thereto, and a transparent outer door panel (not shown) made of acrylic resin is fixed to the outer surface of the door body 25.

Next, FIGS. 8 and 9 show another embodiment of the structure of the door 4, and when the claws 28, 28, . . . The claws 28, 28 are fitted into mounting recesses 35 formed in the punching plate 29.
The punching plate 26 is fixed at the same time as the punching plate 26. A rubber packing 36 is placed on the fixing fitting 34, and after this placement an inner door panel 37 made of glass is press-fitted. Further, an outer door panel (not shown) made of acrylic resin is fixed to the outer surface of the door body 25.

Here, in the door 4 having the structure shown in FIG. 7, the inner door panel 33 is adhered and fixed, while the
In the door 4 having the structure shown in the figure, the inner door panel 37
are crimped and fixed, and both inner door panels 3
The fixed states of Nos. 3 and 37 are different from each other. However, in this case, the main door components of both, namely the door body 25 and the punching plate 29, are the same, and the only structural difference is that the fixing metal fitting 34 is fitted into the mounting recess 35 when the claws 28, 28... are bent. It is only a matter of fixing or not, and therefore, almost a common mold can be used for different doors.

(f) Effect of the invention As is clear from the above explanation, according to the invention, the punching plate is attached to the door body so that the nail of the door body is inserted into the insertion hole of the punching plate, and the nail is inserted into the door. Since the punching plate is fixed to the door body by bending it toward the outer edge of the body, there are no spot welding points that require special equipment, and the cost of the door can be reduced. Furthermore, most of the door parts can be made to the same specifications for microwave oven doors whose inner door panels are fixed in different states, and therefore the molds for molding the door parts can be used in common, which further reduces costs.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a general microwave oven, Fig. 2 is a perspective view of essential parts of a conventional door, Fig. 3 is a perspective view of the same door, Fig. 4 is a perspective view of another conventional door, and Fig. 4 is a perspective view of another conventional door. 5
6 is a perspective view of another essential part of the door, FIG. 7 is a perspective view of the door, and FIG. 8 is a perspective view of another embodiment of the door. FIG. 9 is a perspective view of the same door. 25...Door body, 28...Claw, 29...Punching plate, 30...Insertion port, 34...Panel fixing fitting, 35...Mounting recess, 33, 37...Inner door panel.

Claims (1)

[Scope of utility model registration request] A heating device comprising a frame-shaped door body having a central opening, a punching plate having a large number of small holes that cover the central opening of the door body and preventing microwaves from passing through, and a transparent panel closing the small holes of the punching plate. In a microwave oven door structure for opening and closing a chamber opening, a plurality of claws are formed on the periphery of the central opening of the door body, and a plurality of insertion holes corresponding to the claws are formed in the punching plate, and the above-mentioned The punching plate is attached to the door body so that the claws are inserted through the insertion openings, and the punching plate is fixed to the door body by bending the claws. A door structure for a microwave oven, characterized in that a mounting portion is formed in which a panel fixture for fixing the transparent panel can be selectively attached and fixed by the claw when the claw is bent.