JP3205237B2 - microwave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven for heating an object to be heated such as food by microwaves. More specifically, the present invention relates to microwave oscillation corresponding to opening and closing of a door for opening and closing a heating chamber. For controlling the microwave oven.

[0002]

2. Description of the Related Art In a microwave oven which is a kind of a cooking device for heating an object to be heated such as food by microwave, a safety device for preventing microwave from leaking from a heating chamber where food is heated is provided. Equipped. This safety device, for example, controls the oscillation of microwaves in response to the opening and closing of an opening / closing door that opens and closes a heating chamber, and the microwave oscillates only when the opening / closing door closes the heating chamber. When the opening / closing door opens the heating chamber, the oscillation of the microwave is stopped.

An example of such a safety device is disclosed in Japanese Patent Laid-Open No. 5-2
No. 03162. FIG. 8 is a configuration diagram of a main part showing the safety device disclosed in that publication. Three switches 51 are provided in the wall adjacent to the heating chamber 59 of the range main body 55.
Are operated simultaneously by sliding of the switch lever 54. The distal end 54a of the switch lever 54 is urged forward by a tension spring 54b, and the distal end 54a is
a projecting forward from a. The tip 54 a of the switch lever 54 is connected to the heating chamber 59 of the range body 55.
When the opening / closing door 56 that opens and closes the heating chamber 59 is closed, the door 56 is pressed and slid at the rear portion of the peripheral edge of the opening / closing door 56. When the switch 51 is operated by sliding the switch lever 54, the oscillation of the microwave is stopped.

[0006] A choke portion for attenuating microwaves is usually provided at a peripheral portion of the door 56.
FIG. 9 is a perspective view of a main part showing an example of a choke part of the opening / closing door. The choke portion 57 has a rectangular frame shape provided over the entire periphery of the opening / closing door 56, and is formed in a tubular shape having a rectangular cross section by a metal plate. A groove-like opening 57a is provided on the back surface facing the range main body. The depth between the opening 57a and the opposing portion of the choke portion 57 is set to １ ／ of the wavelength λ of the microwave for heating the object to be heated in the heating chamber.

Japanese Unexamined Patent Publication (Kokai) No. 6-168780 discloses that, as shown in FIG.
7e is disclosed. This chalk part 5
7 is a slit 5 in which a plurality of outer peripheral surface portions 57d extending from the outer peripheral side edge of the front portion 57c located on the far side of the range main body to the range main body side are located between the outer peripheral surface portions 57d.
7e provided at a constant pitch.
At the end of each outer peripheral surface portion 57d, a back surface portion 57f bent at a right angle so as to extend into the opening 57a is provided.

As described above, since the choke portion 57 is provided on the periphery of the opening / closing door 56, the switch lever 54 for operating the switch 51 comes into contact with the choke portion 57 and slides. I have.

However, in a state where the choke portion 57 of the opening / closing door 56 is exposed, since it is not preferable in appearance, a choke cover 58 made of synthetic resin for covering the range body side of the choke portion 57 is usually provided. When the door 56 is turned, the choke cover 58 comes into contact with the switch lever 54, and the switch lever 54 is slid.

In Japanese Patent Publication No. 2-28056, FIG.
12, the switch lever 54 is disposed so as not to protrude from the front portion 55 a of the range main body 55, and the choke portion 57 of the opening / closing door 56 is attached to the choke portion 5.
7 is a synthetic resin chalk cover 5 that covers the opening 57a.
8 is provided, and the door key 56a is formed integrally with the choke cover 58. When the opening / closing door 56 is rotated so as to close the heating chamber 59, the door key 56a fits into a small hole 55b provided in the front portion 55a of the range main body 55, and is provided on the range main body 55. By contacting the switch lever 54, the switch lever 54 is slid. Switch lever 5
The slide 51 causes the switch 51 provided on the range main body 55 to operate.

In a configuration in which the switch lever 54 does not protrude from the front portion 55a of the range main body 55, as shown in FIG. 9, when the choke portion 57 of the opening / closing door 56 is exposed, as shown in FIG. As indicated by the dashed line, a door key 56a made of metal may be directly welded to the back surface of the choke portion 57 facing the range main body.

[0010]

As described above, if the door key 56a is directly welded to the choke portion 57 in a state where the choke portion 57 of the opening and closing door 56 is exposed, not only the choke portion 57 but also the choke portion 57 is welded. Since the welded portion of the door key 56a is also visible, there is a problem in appearance, and further, the welding work between the choke portion 58 and the door key 56a is troublesome, and there is also a problem that the manufacturing efficiency is poor.

The front end portion 54a of the switch lever 54 provided on the range main body 55 is
a, the synthetic resin chalk cover 58 provided on the opening / closing door 56 is pressed and slid by the back surface of the synthetic resin chalk cover 58 provided in the opening / closing door 56.
Cover the opening 57a of the choke portion 57, the urging force of the switch lever 54 is
8 only supported. As a result, the choke cover 58 may be deformed by the urging force of the switch lever 54.

In particular, in a microwave oven capable of heating an object to be heated not only by microwaves but also by a heater, the inside of the heating chamber 59 is heated by the heater with the switch lever 54 pressed firmly against the choke cover 58. Therefore, the choke cover 57 that supports the urging force of the switch lever 54 is easily deformed.

Similarly, a chalk cover 57 made of synthetic resin is used.
When the door key 56a is provided integrally with the switch lever 54, the door key 56a is strongly pressed against the switch lever 54, and the door key 56a is supported only by the choke cover 58 in a state of covering the opening 57a of the choke portion 57. The chalk cover 58 may be deformed. Further, at the time of heating by the heater, the possibility that the choke cover 58 is deformed is further increased.

As shown in FIG. 10, even when a slit 57e is provided in the choke portion 57, the choke portion 5
When the urging force of the switch lever 54 is applied to the synthetic resin choke cover 58 that covers the opening 57a and the slit 57e of the seventh, the choke cover 58 is deformed.

When the choke cover 58 is deformed by the biasing force of the switch lever 54, the switch lever 54 is not reliably slid by the choke cover 58 or the door key 56a provided on the choke cover 58, and is opened and closed. Door 56 is heating chamber 59
Is closed, the switch 51 does not operate,
There is a possibility that an object to be heated such as food in the heating chamber 59 cannot be heated by the microwave.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a chalk cover made of synthetic resin.
An object of the present invention is to provide a microwave oven that can be prevented from being deformed by the urging force of a switch lever.

[0017]

According to a first aspect of the present invention, there is provided a microwave oven having a heating chamber for accommodating an object to be heated, wherein the object to be heated in the heating chamber is heated by microwaves. A range body, a frame-shaped choke portion which is attached to the range body so as to open and close the heating chamber, is hollow at the periphery and has a rectangular cross section, and has an opening facing the range body, and the An opening / closing door having a choke cover covering an opening of the choke portion, a safety switch attached to the range main body so as to control microwave oscillation, and slidably disposed on the range main body to operate the safety switch. A switch lever biased so that the tip protrudes from the front of the range body,
In the choke portion of the opening / closing door, a plurality of back portions facing the range main body are arranged at a fixed pitch, and a tip portion of the switch lever faces a predetermined back portion via a choke cover. It is characterized by doing.

In the microwave oven according to the present invention, an inclined portion extending in an inclined direction in a direction away from the range main body is provided at a tip of a rear portion other than a rear portion of the choke portion opposite to a switch lever facing the switch lever. The microwave oven according to claim 3, further comprising a heating chamber in which the object to be heated is accommodated, wherein the microwave oven heats the object to be heated in the heating chamber, and a heating chamber. A frame-shaped choke portion, which is attached to the range body so as to open and close, is hollow with a rectangular cross-section at the periphery, and has an opening facing the range body, and an opening of the choke portion. An opening / closing door with a chalk cover to cover, a safety switch attached to the range body to control microwave oscillation, and a slide to the range body to operate this safety switch A switch lever whose tip end is urged forward of the range main body, wherein the choke portion of the opening / closing door has a plurality of rear portions facing the range main body arranged at a constant pitch. The choke cover is provided with a door key which is opposed to a predetermined rear surface portion and which comes into contact with a tip portion of the switch lever.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic perspective view showing an embodiment of a microwave oven according to the present invention. The microwave oven includes a range body 10 in which a heating chamber 11 having an opening 11a on the front side is provided, and an opening / closing door 20 whose lower part is rotatably supported below the opening 11a of the range body 10. have.

An object to be heated such as food to be heated is accommodated in the heating chamber 11, and the object to be heated accommodated in the heating chamber 11 is heated by microwaves.
Around the opening 11a of the range main body 10, a front surface portion 12 is formed in a rectangular frame shape by a conductive metal plate. On one side of the front part 12,
An operation panel 13 on which a power switch, a timer, a start key, and the like are arranged is provided. And the front part 12
A small hole 12a is provided at a corner near the upper operation panel 13 in FIG. 1, and the tip of the switch lever 14 projects forward from the small hole 12a. The switch lever 14 is a safety switch 1 that controls the oscillation of microwaves for heating an object to be heated in the heating chamber 11.
5 (see FIG. 2).

The opening / closing door 20 is rotated between a horizontal state in which the heating chamber 11 of the range main body 10 is opened and a vertical state in which the heating chamber 11 is closed. The opening / closing door 20 that is in a vertical state so as to close the heating chamber 11 is in contact with the front portion 12 of the range main body 10.

FIG. 2 is a longitudinal sectional view of a main part showing a state in which the heating chamber 11 of the microwave oven main body 10 is closed by the opening / closing door 20 of the microwave oven. The opening / closing door 20 has a door panel 21 made of a single metal plate. The central portion of the door panel 21 except the peripheral portion is a see-through window 21a provided with a see-through window formed by punching.
When the opening / closing door 20 closes the heating chamber 11 of the range main body 10, the see-through window 21 a faces the opening 11 a of the heating chamber 11.

The range body 1 is provided around the transparent window 21a.
A step portion 21b bent at a right angle to the 0 side is provided over the entire circumference, and a connection portion 21c parallel to the see-through window 21a is provided in a rectangular frame shape over the entire circumference around the step portion 21b. Have been. And this connecting part 21
Around the c, a choke portion 21d in the shape of a hollow cylinder having a square cross section is provided in a frame shape over the entire circumference.

A frame-shaped silicon rubber 23 is provided on the step 21b of the door panel 21 over the entire circumference.
The silicon rubber 23 supports the rectangular rear glass 22 covering the see-through window 21a on the step 21b.

FIG. 3 is a perspective view of the choke portion 21d of the door panel 21 of the opening / closing door 20. Chalk part 2
1d is an inner peripheral surface portion 21e horizontally extending from the connecting portion 21c of the door panel 20 in a direction away from the range main body 10.
And a front portion 21f that is bent perpendicularly from the inner peripheral surface portion 21e to the outer peripheral side on the far side of the range main body 10.
A plurality of outer peripheral surface portions 21g extending horizontally toward the range body 10 at a predetermined pitch in the circumferential direction are provided on the front portion 21f.
The outer peripheral surface 21g is provided with a rear surface 21h that is bent perpendicularly to the inner peripheral side. A slit 21m having a predetermined width is formed between each adjacent outer peripheral surface 21g and each rear surface 21h. The front end of each back surface 21h is opposed to the inner peripheral surface 21e over the entire circumference with a predetermined space therebetween, and the space is an opening 21n facing the range main body 11.

In the choke section 21d, the distance between the back section 21h and the front section 21f is set to 1/4 of the wavelength λ of the microwave used for heating the object to be heated in the heating chamber 11.

As shown in FIG. 2, a rectangular outer frame 25 is in contact with the front portion 21f of the choke portion 21d over the entire circumference. A windshield 26 is supported on the inner circumference of the outer frame 25 over the entire circumference. An outer peripheral wall portion 25 extending horizontally to the range body 10 side is provided on an outer peripheral edge portion of the outer frame 25.
a is provided over the entire circumference.

A synthetic resin chalk cover 24 is fitted between the outer peripheral wall 25a of the outer frame 25 and the back surface 21h of the choke 21d. The choke cover 24 is provided on each of the rear portions 21 of the choke portion 21d.
h, so as to cover the choke portion 21d, and the inner peripheral side portion 24b is bent so as to enter the opening 21n between the back surface portion 21h and the inner surface portion 21e. . Also, the outer peripheral side portion 24 of the choke cover 24
a extends horizontally in a direction away from the range main body 10 at an appropriate distance from the outer peripheral surface portion 21g of the choke portion 21d, and abuts on the inner surface side of the outer peripheral wall surface portion 25a of the outer frame 25. It has become. A locking projection 25 provided on the inner surface of the outer peripheral wall portion 25a of the outer frame 25
b is locked to the outer peripheral side portion 24 a of the choke cover 24.

A small hole 12a disposed at an upper corner near the operation panel 13 on the front portion 12 of the range body 10 has a range body 10 covered by the front portion 12.
The tip of the switch lever 14 disposed in the wall portion of FIG. When the opening / closing door 20 closes the heating chamber 11 of the range main body 10, the switch lever 14 protruding from the small hole 12 a opens the door panel 2 of the opening / closing door 20.
It is arranged so as to face one back part 21 h above the choke part 21 d provided in the unit 1 via a choke cover 24. The switch lever 14 is in a state of being urged forward by a spring (not shown), and is pushed rearward by a portion of the choke cover 24 supported by the back surface 21h of the choke portion 21d of the opening / closing door 20. Slided. When the switch lever 14 is slid rearward, the safety switch 15 arranged in the wall of the range main body 10 is operated, and a state is established in which microwaves can be oscillated.

The microwave oven having such a configuration is used as follows. When the opening / closing door 20 of the microwave oven is turned downward and the heating chamber 11 of the microwave oven body 10 is opened, food is stored in the heating chamber 11. Heating room 1
When the food is stored in the inside 1, the opening / closing door 20 is rotated upward, and the opening 11 a of the heating chamber 11 is closed.

As a result, the choke cover 24 of the opening / closing door 20 comes into contact with the tip of the switch lever 14 protruding from the front portion 12 of the range body 10, and the switch lever 14 urged forward is Chalk cover 2
4 and slid backwards. As a result, the safety switch 15 operates and the range body 10
Is in a state where high frequency can be oscillated.

At this time, the door panel 21 of the opening / closing door 20
Is in a state in which one back portion 21h of the choke portion 21d faces the distal end portion of the switch lever 14 via the choke cover 24, and the urging force of the switch lever 14 is supported by the back portion 21h. Become.
Therefore, the urging force of the switch lever 14 is supported by the back surface 21h via the choke cover 24, and the deformation of the choke cover 24 due to the urging force of the switch lever 14 is prevented.

Thereafter, by operating a start key or the like provided on the operation panel 13, a microwave is oscillated in the heating chamber 11, and the food housed in the heating chamber 11 is heated by the microwave. The microwave oscillated into the heating chamber 11 is supplied to the choke portion 21 d of the opening / closing door 20.
This prevents leakage to the outside.

The switch lever 14 is in a state where one back surface 21h constituting the choke portion 21d of the door panel 21 is opposed via the choke cover 24. The rear portion 21h is bent at a right angle from the distal end portion of the outer peripheral surface portion 21g provided between the pair of slits 21x so as to extend horizontally from the front portion 21f of the choke portion 21d. And it is in a state of being urged toward the range main body 11 side by the elastic force of the back part 21h itself. Therefore, the switch lever 1 urged forward is
4 is supported by the back surface 21h via the choke cover 24 and can oppose the urging force of the switch lever 14.

When the heating chamber 11 is opened by rotating the opening / closing door 20 in a state where microwaves are oscillating in the heating chamber 11, the choke cover 24 and the switch lever 14 are opened.
And the switch lever 14 is slid forward. As a result, the operation of the safety switch 15 is released, and the oscillation of the microwave is stopped.

As described above, the front portion 12 of the range body 11
The tip of the switch lever 14 projecting forward from is pressed by a choke cover 24 made of synthetic resin.
Since the biasing force of the switch lever 14 in the choke cover 24 is supported by the back surface 21h of the choke portion 21d provided on the opening / closing door 20, its deformation is reliably prevented. As a result, since the choke cover 24 comes into contact with the switch lever 14 and slides reliably, the safety switch 15 is reliably operated.

The rear portion 21h of the choke portion 21d of the door panel 21 of the opening / closing door 20 is connected to the switch lever 14 via the choke cover 24 as shown in FIG.
Except for those facing the inner peripheral surface, an inclined portion 21y inclined in a direction away from the range main body 10 toward the inner peripheral surface side may be provided at each end portion.
With such a configuration, high-frequency leakage by the choke portion 21d is more reliably prevented.

The rear portion 21h of the choke portion 21d of the door panel 21 is usually not provided at each corner of the choke portion 21d in order to prevent high frequency leakage. For this purpose, the tip of the switch lever 14 is provided at a position close to the corner of the front part 12 so as not to face a part where the back part 21h of the choke part 21d is not arranged.

FIG. 5 is a perspective view showing another embodiment of the microwave oven according to the present invention, FIG. 6 is a longitudinal sectional view of a main part of the microwave oven with an opening / closing door closed, and FIG. FIG. 3 is a perspective view showing an upper part of a door panel 21 of an opening / closing door 20 provided in the microwave oven together with a choke cover 24. In this microwave oven, the front portion 12 of the
The switch key 14 does not protrude from the small hole 12a provided in the opening 12a, but the door key 24d that enters the small hole 12a is integrated with the choke cover 24 of the opening / closing door 20 with the choke cover 24. Is provided. A door key 24d provided on the choke cover 24 is provided to face the back surface 21h of the choke portion 21d of the door panel 21 of the opening / closing door 20. Other configurations are the same as those of the microwave oven of the above embodiment.

In the microwave oven having such a configuration, when the opening / closing door 20 closes the heating chamber 11 of the range main body 10, the choke cover 24 provided on the opening / closing door 20 is provided.
Of the door key 24d is fitted into a small hole 12a provided in the front portion 12 of the range main body 10, and the switch lever 14 provided in the wall of the range main body 10 is slid backward, so that the safety switch 15 is Make it work.

The door key 24d provided integrally with the choke cover 24 is connected to one back portion 2 of the choke portion 21d.
1h, the switch lever 14
Of the rear portion 21h via the door key 24d.
It is surely supported by. Therefore, switch lever 1
The deformation of the choke cover 24 due to the urging force of 4 is prevented, and the switch lever 14 is reliably slid backward. As a result, the safety switch 15 can be operated reliably.

Also in the case of the present embodiment, the back surface 21h of the choke portion 21d in the opening / closing door 20 is usually not provided at each corner of the choke portion 21d in order to prevent microwave leakage. For this reason, the door key 24d of the choke cover 24 is disposed at a position where the rear portion 21h is provided close to the corner of the choke cover 24, and the small hole 12a into which the switch key 24d fits is also provided on the door key 24d. It is arranged correspondingly.

[0044]

As described above, in the microwave oven according to the present invention, the choke cover of the opening / closing door facing the switch lever for operating the safety switch is supported by the back surface of the choke portion. There is no possibility that the choke cover is deformed by the biasing force of the switch lever, and the switch lever can be slid reliably. Therefore, the safety switch is operated accurately and there is no possibility of malfunction.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of an embodiment of a microwave oven according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part in a state where a heating chamber of a microwave oven main body is closed by an opening / closing door of the microwave oven.

FIG. 3 is a perspective view of a choke portion of an opening / closing door of the microwave oven.

FIG. 4 is a perspective view of another embodiment of the choke portion in the opening / closing door.

FIG. 5 is a schematic perspective view showing another example of the embodiment of the microwave oven of the present invention.

FIG. 6 is a longitudinal sectional view of a main part in a state where a heating chamber of a microwave oven main body is closed by an opening / closing door of the microwave oven.

FIG. 7 is a perspective view of a choke portion of the opening / closing door of the microwave oven.

FIG. 8 is a schematic view of a main part showing the inside of a conventional microwave oven.

FIG. 9 is a perspective view of a choke portion provided in a conventional microwave oven opening / closing door.

FIG. 10 is a perspective view showing another example of a choke portion provided on the opening / closing door of a conventional microwave oven.

FIG. 11 is a sectional view showing another example of the inside of a conventional microwave oven.

FIG. 12 is a perspective view of a main part of the opening / closing door of the microwave oven.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Range main body 11 Heating room 11a Opening 12 Front part 12a Small hole 14 Switch lever 20 Opening / closing door 21 Door panel 21d Choke part 21e Inner peripheral part 21f Front part 21g Outer peripheral part 21h Back part 21m Slit 21n Opening 22 Rear glass 24 Choke cover 24d Door key 25 Outer frame 26 Windshield

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24C 7/02 H05B 6/64 H05B 6/76

Claims (3)

(57) [Claims] 1. A heating chamber for accommodating an object to be heated, wherein the object to be heated in the heating chamber is heated by microwaves, and a microwave oven is attached to the microwave oven to open and close the heating chamber. And a frame-shaped choke portion having a hollow rectangular cross section at the periphery and provided with an opening facing the range body, and
An opening / closing door having a choke cover for covering the opening of the choke portion, a safety switch attached to the range main body to control microwave oscillation, and slidably disposed on the range main body to operate the safety switch. A switch lever urged such that the tip protrudes from the front part of the range main body.The choke part of the opening and closing door has a plurality of rear parts facing the range main body at a constant pitch. A microwave oven, wherein a tip end of the switch lever is opposed to a predetermined rear surface via a choke cover. 2. An end portion of the back portion other than the back portion of the choke portion facing the switch lever is provided with an inclined portion extending in a direction away from the range main body in an inclined state. 2. The microwave oven according to 1. 3. A heating chamber for accommodating an object to be heated, wherein the object to be heated in the heating chamber is heated by microwaves; and a microwave oven is attached to the oven body so as to open and close the heating chamber. And a frame-shaped choke portion having a hollow rectangular cross section at the periphery and provided with an opening facing the range body, and
An opening / closing door having a choke cover for covering the opening of the choke portion, a safety switch attached to the range main body to control microwave oscillation, and slidably disposed on the range main body to operate the safety switch. A switch lever whose tip is biased forward of the range main body, wherein the choke portion of the opening / closing door has a plurality of rear portions facing the range main body arranged at a constant pitch, A microwave oven, wherein the choke cover is provided with a door key which is opposed to a predetermined rear surface portion and which comes into contact with a tip portion of the switch lever.