JPS5939874B2 - microwave door structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a microwave oven door structure.

FIG. 1 shows a conventional door structure. Reference numeral 1 denotes a rectangular door frame, and a see-through window 2 is provided in the center of the frame to allow the inside of the heating chamber to be seen through when the door is closed.

Reference numeral 3 denotes a metal standing wall that extends parallel and continuous to the four sides of the door frame 1 and is welded to the bottom of the frame.
It is divided into two parts.

6 is a punching plate that is fixed to the inner surface of the door frame 1 with screws and covers the transparent window 2 and regulates the opening of the choke groove 4; T is a ferrite plate that covers the opening of the auxiliary groove 5; 8;
is a backing metal plate fixed to the metal vertical wall 3 and located on the back side of the ferrite plate 7.

Therefore, the radio waves leaking from the heating chamber are first absorbed by the choke groove 4, and the radio waves that are not absorbed are absorbed by the ferrite 7, and at this time, the backing metal plate 8 is made of ferrite □
increases the radio wave absorption effect of However, in the above structure, when the door is provided with a so-called latch for locking the door and the main body when the door is closed, as is clear from the assembly order of the above door structure, the latch is installed only in the choke groove 4, Not only does this have a small degree of freedom in design, but it is also undesirable to house a metal structure such as a latch mechanism in the choke groove from the viewpoint of the choke effect.

Therefore, the present invention makes it possible to store a metal structure such as a latch mechanism in the auxiliary groove in the door structure as described above,
Moreover, the door structure can be easily assembled and disassembled.

In FIGS. 2 to 5 showing this embodiment, reference numeral 10 denotes a rectangular door frame, and a see-through window 11 is provided at the center of the frame to see through the inside of the heating chamber.

12 is a latch that is arranged on one side of the door frame 10 and projects from the inner surface of the door; 13 is a latch that extends parallel to and continuous with the other three sides of the door frame 10, excluding the side where the latch 12 is located, and is welded and fixed to the bottom of the frame. The first metal vertical wall partitions the door frame 10 into a choke groove 14 on the inner circumferential side and an auxiliary groove 15 on the outer circumferential side.

Reference numeral 16 denotes a second metal vertical wall that extends parallel to the side where the latch 12 is located and is detachably arranged on the bottom surface of the door frame 10. The vertical wall similarly connects the side of the door frame 10 with the choke groove 1.
7 and an auxiliary groove 18.

The second metal vertical wall 16 is one of the features of the present invention and will be described later. 19 is welded and fixed to the first metal vertical wall 13,
a first backing metal plate that substantially covers the opening of the auxiliary groove 15;
0 is a second backing metal plate disposed in the auxiliary groove 18 on the side of the door frame where the latch 12 is located, and this metal plate has a horizontal surface 20a that substantially covers the opening of the auxiliary groove 18.

The second backing metal plate 20 is another feature of the present invention and will be described later. A fixing plate 21 is welded to the center of the inner surface of the door frame 10 and has a window aligned with the see-through window 11 of the frame 10 and extends into the yoke grooves 14 and 17. Reference numeral 22 is a see-through window arranged on the back side of the fixing plate. A glass plate 23 covers the glass plate 11, and a plate 23 fixes the glass plate at its periphery.
A metal holding plate is clamped and fixed together with the holding plate 21 and extends over the openings of the yoke grooves 14 and 17 to regulate the opening area thereof.The holding plate is fixed to the fixing plate 21 with screws.

24 is a metal punched thin plate inserted between the glass plate 22 and the fixed plate 23.

Reference numeral 25 denotes a chain yoke groove 14, 1 regulated by a presser plate 23.
A dielectric cover 26 covers the opening of the first
, the auxiliary groove 15 via the second backing metal plates 19 and 20,
This is a ferrite plate that covers the 18 openings.

The above-mentioned projecting peripheral edge of the presser plate 23 is connected to the chiyoke grooves 14 and 17.
It is bent inward, and the inner peripheral edge of the yoke cover 25 is bent into a groove shape, and these bent portions of the holding plate 23 and the yoke cover 25 are engaged with each other. Further, the ferrite cover 26 is in contact with the first and second backing metal plates 19 and 20, and has a stepped portion formed on its inner periphery, while the outer periphery of the yoke cover 25 is in contact with the auxiliary grooves 15 and 18. The bent portion is in contact with the stepped portion of the ferrite cover 26. The ferrite cover 26 further has hook-shaped legs 27 that hang down at appropriate positions on its outer periphery.
The tips of the legs are engaged with holes provided in the peripheral wall of the door frame 10. Reference numeral 28 denotes a decorative frame that covers the front and circumferential sides of the door frame 10. The center of the decorative frame 28 is open, and the glass plate 29 inserted between the decorative frame 28 and the door frame 10 covers this opening.

Reference numeral 30 denotes a door handle fixed to the front surface of the decorative frame 28 corresponding to the side of the door frame 10 where the latch 12 is located.

The door handle 30 operates the latch 12 via a latch mechanism (omitted in FIG. 3) housed in the auxiliary groove 18, and this mechanism will be described below with reference to the second metal vertical wall 16 and the second metal vertical wall 16. This will be explained in particular in FIG. 5 together with the backing metal plate 20.

The second metal vertical wall 16 has a vertical surface 16a1 and the first to third slopes 16.
b to 16d and a horizontal surface 16e, the first to third slopes 16b to 16d are spaced apart from each other and rise obliquely from the upper edge of the vertical surface 16a toward the outside of the door frame 10, and the horizontal surface 16e is located above the vertical surface 16a. It extends horizontally toward the outside of the door frame 10 from the lower edge.

The second backing metal plate 20 has the aforementioned horizontal surface 20a, vertical surface 20b, and first and second slopes 20c and 20d.

The horizontal surface 20a has a long hole 20e, the vertical surface 20b hangs down from the outer edge of the horizontal surface 20a, and the first and second slopes 20c, 2
0d are spaced apart from each other and extend diagonally downward from the inner edge of the horizontal surface 20a toward the inside of the door frame 10. Therefore, the first and second slopes 20c, 2 of the second backing metal plate 20
0d is the first to third slopes 16b to 16 of the second metal vertical wall 16
Therefore, the auxiliary groove 18 is fitted between the second metal vertical walls 16
The second backing metal plate 20 is substantially surrounded by the above-mentioned surfaces.

Note that projecting pieces 20f and 20g further protrude from the inner edge of the horizontal surface 20a of the second backing metal plate 20, and these projecting pieces are inserted into the notches 16e and 16f formed on the upper edge of the second slope 16c of the second metal vertical wall 16. They are mated.

Reference numeral 31 denotes a latch mechanism accommodated in the auxiliary groove 18 surrounded as described above,
A latch 12 pivotally mounted in the center by a shaft 33, a spring 34 biasing the latch in one direction, and a left lever 35 and a right lever 36 for rotating the latch 12 against the spring.
It is made up of

Although such a latch mechanism itself is well known and will not be described in detail, if the ends of the left and right levers 35 and 36 are moved close to the horizontal surface 32b of the latch board 32, these levers 35
, 36 rotate around fulcrums 37 and 38, and their tips push up the lower end 12a of the latch 12, causing the latch 12 to rotate around the shaft 33. The door handle 30 includes a handle cover 30a that is fixed to the decorative frame 28, and an operating lever 30 that is housed within the cover and is movable back and forth with respect to the decorative frame 28.
Fixing screws 40a and 40b are installed at both base ends of the handle cover 30a, and operation rods 41a and 41b are installed at both base ends of the operation lever 30b, respectively.

The fixing screws 40a and 40b pass through the holes provided in the horizontal surface 16e of the decorative frame 28, the door frame 10, and the second metal vertical wall 16, and then pass through the holes 32c and 32d in the horizontal surface 32b of the latch board 32, and the screws pass through the holes 32c and 32d in the horizontal surface 32b of the latch board 32. 42a and 42b, and thus the handle cover 30a is fixed to the decorative frame 28, and the decorative frame 28, the door frame 10, and the second
Horizontal surface 16e of the metal vertical wall and horizontal surface 32b of the latch board
are sequentially laminated and fixed.

On the other hand, the operating rods 41a, 41b pass through holes provided in the decorative frame 28, the door frame 10, the horizontal surface 16e1 of the second metal vertical wall, and the horizontal surface 32b of the latch board, and then pass through the holes at the ends of the left and right levers 35, 36. Pass through 35a and 36a and screw 43
It is locked by a and 43b.

That is, when the door handle 30 is grasped, the operating lever 30b
moves backward, the ends of the left and right levers 35, 36 are pulled, and the latch 12 is rotated. When assembling the above door structure, the front glass plate 29 and the decorative frame 28 are first attached to the door frame 10 to which the first metal standing wall 13, the first backing metal plate 19 and the fixing plate 21 are fixed in advance, and then the door handle is attached. 30
At the same time, the second metal vertical wall 16 and the latch mechanism 31 are installed.
to fix.

Next, the second backing metal plate 20 is inserted through the opening of the auxiliary groove 18. At this time, the latch 12 protrudes from the long hole 20c of the metal plate. Thereafter, the ferrite plate 26 and the chiyoke cover 25 are attached in this order. At this time, the latch 12 protrudes from the notch in the ferrite plate 26. Finally, the holding plate 23 is attached to sandwich the punching plate 24 and the glass plate 22 together with the fixing plate 21, and this is screwed to complete the process. At this time, the second backing metal plate 20 is simply the auxiliary groove 1
8, but it is pressed and fixed with a chiyoke cover 25, a ferrite plate 26, etc. Note that the decorative frame 28 may be screwed to the door frame 10 as appropriate. The door structure can be easily disassembled by following the assembly order in reverse order.

At this time, the ferrite plate 26 is locked to the door frame 10 by its legs 27, but since these legs are flexible, the ferrite plate 26 can be easily separated from the door frame 10 if the ferrite plate 26 is lifted a little forcefully. As is clear from the above description, according to the present invention, the inner and outer circumferences of a rectangular door frame are partitioned by metal vertical walls, and the inner and outer circumferential sides thereof are respectively used as a chiyoke groove and an auxiliary groove. In a door structure in which the opening is covered with a ferrite plate and a lining metal plate is placed on the back side of the ferrite plate, assembly and disassembly of the door is difficult even though a metal structure such as a latch mechanism is housed in the auxiliary groove. easily done.

[Brief explanation of drawings]

Fig. 1 is a sectional view of main parts showing a conventional example, Figs. 2 to 5 show an embodiment of the present invention, Fig. 2 is a rear perspective view of the door, and Fig. 3
The figure is a sectional view, FIG. 4 is an exploded perspective view, and FIG. 5 is an enlarged exploded perspective view of main parts. 10...Door frame, 13,16...
・First and second metal vertical walls, 26... Ferrite plate, 19, 20... First and second lining metal plate, 3
1... Latch mechanism.

Claims (1)

[Claims] 1. The inner and outer peripheries of a square door frame are partitioned by metal vertical walls, and the inner and outer peripheries are used as a choke groove and an auxiliary groove, respectively, and the opening of the auxiliary groove is covered with a ferrite plate, and the back side of the ferrite plate is A door structure in which a metal lining plate is placed on at least one side of the door frame, and the metal vertical wall and the metal lining plate are detachable from each other on at least one side of the door frame, and a metal structure such as a latch mechanism is provided in the auxiliary groove. A microwave oven door structure that houses.