JPH06313555A - Microwave oven - Google Patents

Abstract

PURPOSE:To release an engagement of a door with a small force by allowing the lower end of an operation board to drop into a recessed part of a release lever so as to lower the operation board, and thereby canceling the engagement between a latch board and the operation board. CONSTITUTION:A release lever 15 is connected to the rear end of a release button 11. There is formed a recessed part 16 neighboring on this side of a boss 15a at the tip. In the upper part of the boss 15a there is laid out a sliding board 18 which acts as an operation board. The sliding board 18 having an engagement part 21 which is laid out above the boss 15a is adapted to drop into the recessed art 16 by operating the sliding board 18, which opens a clutch board 10. This construction makes it possible to carry out a door release operation with a small force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven, and more particularly to a microwave oven having a door release mechanism for opening a door.

[0002]

2. Description of the Related Art Conventionally, some microwave ovens have a microwave oven device body provided with a door release mechanism. As shown in FIG. 5, the door release mechanism includes a door 30 arranged at the front end of the device body 34 and a latch plate 33 having a hook portion 32 formed at the fulcrum 31 of the door 30. A release lever 36 attached to the lower part of the front surface of the device body 34 via a spring 35, a latch lever 38 rotatably connected to a fulcrum 37 of the device body 34, and a latch lever 38 arranged above the latch lever 38. Operating lever 39 and device body 3
Locking part 4 fixed inside 4 and engageable with latch plate 33
It is mainly composed of 0s. The latch plate 33 is urged downward by a latch spring 41 having one end fixed to the door 30. As a result, the operating lever 39 is pushed down via the hook portion 32, and the contact of the micro switch 43 installed inside the device body 34 maintains the closed state. As a result, the high frequency can be supplied.

When the door 30 is opened, the release lever 3
Press 6. Then, the latch lever 38 moves upward around the fulcrum 37 and pushes up the operating lever 39. The operating lever 39 further pushes up the latch plate 33. As a result, the hook portion 32 of the latch plate 33 is disengaged from the locking portion 40, and the door 30 is ready to be opened. At this time, the operating lever 39 is released from the pressing force of the latch plate 32, the contact of the micro switch 43 is released, and the supply of high frequency is set to the suspended state. The release lever 36 returns to the initial position by the spring force of the spring 35.

[0004]

In the above-mentioned conventional microwave oven, the door 30 is pressed against the front surface of the device main body 34 in order to prevent leakage of high frequency waves from the heating chamber during heating and improve heating efficiency in the heating chamber. Must be done. Also, the door 30 must be kept in a locked state in order to ensure safety during heating. Therefore, it is necessary to apply a predetermined spring force to the spring 41 and press the latch plate 32 against the locking portion 40. In addition, the micro switch 4 is operated via the operating lever 39.
The spring force of the spring 41 is also required to operate the contacts of No. 3.

However, when the door 30 is opened, the latch plate 33 must be pushed up above the locking portion 40 against the spring force of the spring 41 to release the latch plate 33 from the locking portion 40. At this time, in the above-mentioned conventional example, the force applied to the release lever 36 by the operator is converted into a right angle direction via the latch lever 38 and the latch plate 33 is pushed up via the operating lever 39. Therefore, friction due to rotation at the fulcrum portion 37 and friction due to slidable movement between the release lever 36 and the operating lever 39 occur, and it is difficult to efficiently transmit the force applied to the release lever 36 to the latch plate 33. For this reason,
A large force is required to operate the release lever 36.

An object of the present invention is to provide a microwave oven which can perform a door release operation with a small force.

[0007]

The present invention is directed to a microwave oven device body, a heating chamber having a front surface opened in the device body, and a high-frequency supplying means for supplying a high frequency to the heating chamber. A door that is rotatably installed on the front of the device body and that closes the opening of the heating chamber so that it can be opened by rotation, an operating plate that is vertically movable inside the device body, and a front surface of the device body. An operating member that is arranged and can return to the state before the operation after the operation, and extends substantially horizontally so as to be interlockable with the operating member
A lever that holds and holds the lower end of the operating plate, and a latch plate that is installed on the door and extends to the heating chamber, and that locks the upper end of the operating plate so that it can be overridden only when moving from the front and maintains the closed state of the door. And a lever is formed adjacent to the lower end mounting / holding portion of the operating plate, and the lower end of the operating plate is slidably dropped from the mounting / holding portion of the lower end of the operating plate by the operation of the operating member. The microwave oven is provided with a recessed portion that unlocks the upper end of the operating plate and the latch plate to open the door.

That is, according to the present invention, the lower end portion of the operating plate is placed and held by the lever so that the latch plate and the operating plate are engaged with each other and a specific concave portion is formed in the lever. The lower end of the actuating plate is dropped into the door, the engagement between the actuating plate and the latch plate is released, and the lower end of the actuating plate is returned to the original position of the lever when the operation is completed, so that the door release operation is performed. Be able to do it with a small force.

[0009]

FIG. 1 shows a microwave oven according to an embodiment of the present invention. The microwave oven 1 includes a device body 2, a heating chamber 3 arranged inside the device body 2, and a high frequency oscillator 4 for supplying a high frequency to the inside of the heating chamber 3. The high frequency oscillator 4 is arranged inside the device body 2 and is opened to the heating chamber 3 via a waveguide not shown. Device body 2
An operation panel 5 and a door 6 are arranged on the front surface of the.

The door 6 is rotatably mounted around a support portion 7 installed at the front end of the apparatus body 2 as a fulcrum, and can close the opening on the front surface of the heating chamber 3. The outer edge portion of the door 6 is composed of a metal frame 6a, and a see-through window 8 is installed in the central portion. A handle 9 is installed on the front surface of the door 6. A latch plate 10, which will be described later, for locking the door 6 is arranged on the rear surface of the door 6. In addition,
A hole 3a through which the latch plate 10 penetrates is formed in the frame portion on the front surface of the heating chamber 3 corresponding to the mounting position of the latch plate 10. Further, a release button 11 as an operation unit is arranged at the bottom of the device body 2.

As shown in FIG. 2, one end of the latch plate 10 is rotatably attached to a support portion 12 in the frame 6a of the door 6, and the other end thereof has a hook portion 13 whose tip projects downward. Has been formed. The hook portion 13 projects toward the device body 2 from a hole (not shown) formed in a part of the frame 6a of the door 6. One end of a latch spring 14 is installed below the supporting portion 12 in the frame 6a. The other end of the latch spring 14 is attached to the outside of the support portion of the latch plate 10.

The release button 11 is arranged so that it can be inserted into a support portion 12 provided at the bottom of the device body 2.
A release lever 15 is connected to a rear end portion (right side in the drawing) of the release button 11, and a columnar portion at the tip thereof serves as a boss portion 15a. The boss portion 15a penetrates a hole 12a formed inside the support portion 12 and having a short tube portion 12b. A recess 16 is formed adjacent to the boss 15a. A taper surface 16 a is formed at the rear end of the recess 16. A button spring 17 is provided inside the support portion 12.
Are arranged. The button spring 17 is arranged outside the boss portion 15a and has one end fixed to the rear end portion of the release button 11 and the other end fixed to the front end portion of the short pipe portion 12b.
Above the boss portion 15a, the slide plate 1 as an operating plate
8 are arranged.

The slide plate 18 is arranged on the side of the inside of the apparatus body 2 corresponding to the hook portion of the door 6 behind the frame in front of the heating chamber 3. An elongated hole 29 is formed inside the slide plate 18. The long hole 29 engages with the pin 20 fixed to the side surface inside the device body 2, and fixes the slide plate 18 so as to be movable in the vertical direction. On the upper end of the slide plate 18, there is formed a protrusion-shaped engaging portion 21 that engages with the hook portion 13 of the latch plate 10. The lower end of the slide plate 18 has an insertion portion 1 that can be inserted into the recess 16 of the boss portion 15a.
9 is formed. A switch operating plate 22 is arranged behind the slide plate 18.

The switch operating plate 22 is a T-shaped member and has a long hole 23 formed therein. The long hole 23 is engaged with a pin 24 fixed to a side surface inside the device body 2, and fixes the switch operating plate 22 so as to be movable in the vertical direction.
An abutting portion 25 with which the tip of the hook portion 13 can abut is formed at the upper end of the switch operating plate 22. Further, an arm portion 26 that protrudes in the horizontal direction is formed in the middle portion of the side surface of the switch operating plate 22. Below the arm portion 26, a micro switch 27 for permitting or prohibiting the supply of high frequency is arranged.

The micro switch 27 is fixed to a side surface inside the device body 2 and has a contact 28 that can abut the arm portion 23. Next, the operation of this microwave oven will be described with reference to FIGS. When the door 6 is opened, when the release button 11 is pressed, the boss portion 15a of the release lever 15 moves rearward through the short pipe portion 12b against the spring force of the button spring 17. The insertion portion 19 arranged above the boss portion 15a is provided with the boss portion 15a as the boss portion 15a moves.
The taper surface 16a moves to the concave portion 16 along the upper surface of the. When the insertion portion 19 descends into the concave portion 16, the upper locking portion 2
1 disengages from the hook portion 13. As a result, the door 6 can be opened (FIG. 3).

When the door 6 is opened, the hook portion 21 is separated from the switch operating plate 22, and the contact 28 of the micro switch 27 is opened. As a result, the supply of high frequency to the heating chamber 3 is stopped. Further, the release button 11 returns to the initial position by the spring force of the button spring 17, and the insertion portion 19 of the slide plate 18 returns from the concave portion 16 to the boss portion 15a via the tapered surface 16a (FIG. 4).

When the door 6 is closed, the hook portion 21 moves while sliding on the upper end portion of the locking portion 21 and engages with the locking portion 21. At the same time, the hook portion 13 presses the switch operating plate 22 to activate the contact 28 of the micro switch 27.
As a result, a high frequency can be supplied to the heating chamber 3. As described above, in this embodiment, the recess 16 is formed in the boss portion 15a, and the slide button 18 having the engaging portion 21 arranged above the boss portion 15a is dropped into the recess 16 by operating the release button 11, thereby latching. The plate 10 is opened. Therefore, as shown in FIG. 5, as compared with the conventional configuration in which the latch plate 33 is released from the locking portion 40 by pushing the latch plate 33 upward against the spring force of the latch spring 41, the release button 11 is released. It requires less force to operate.

Further, the spring force of the latch spring 14 can be set larger than in the conventional case in order to keep the door 6 airtight with respect to the device body 2 and to reliably operate the contact 28 of the micro switch 27. In this case, without increasing the force required to operate the release button 11 compared to the conventional one,
It is possible to prevent leakage of high frequency waves, improve heating efficiency, and increase safety of high frequency cooking.

[0019]

According to the microwave oven of the present invention, the lower end of the operating plate is dropped into the recess formed in the lever so that the operating plate descends to release the engagement between the latch plate and the operating plate. Therefore, compared with the conventional configuration in which the latch plate is pushed up against the spring force of the latch spring, the force required for the door release operation is small.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a microwave oven according to the present invention.

FIG. 2 is an explanatory diagram for explaining a mechanism around a door of a microwave oven according to the present invention.

FIG. 3 is a view corresponding to FIG. 2 showing a different state.

FIG. 4 is a view corresponding to FIG. 2 showing a further different state.

FIG. 5 is a view corresponding to FIG. 2 showing a conventional example.

[Explanation of symbols]

 1 Microwave Oven 2 Microwave Oven Main Unit 3 Heating Chamber 4 High Frequency Oscillator 6 Door 10 Latch Plate 11 Release Button (Operating Part) 14 Latch Spring 15 Release Lever 15a Boss 16 Recess 17 Button Spring 18 Slide Plate (Operating Plate)

Claims (1)

[Claims] 1. A microwave oven device main body, a heating chamber having a front surface opened in the device main body, a high-frequency supply unit for supplying high-frequency waves to the heating chamber, and a heating chamber on the front face of the device main body. A door that is movably installed and closed so that the opening of the heating chamber can be opened by rotation; an actuation plate that is vertically movable inside the device body; and an operation plate that is arranged on the front surface of the device body. An operation member capable of returning to a state before operation after operation, a lever extending substantially horizontally interlockingly with the operation member, and holding and holding a lower end portion of the operation plate, and installed in the door to the heating chamber. A latch plate that extends and is locked to the upper end of the operating plate so as to be able to get over only when moving from the front side and holds the closed state of the door; Operation of the operation member formed adjacently The lower end of the operating plate is slidably dropped from the lower end mounting and holding portion of the operating plate, the upper end of the operating plate and the latch plate are unlocked, and the door is opened. Microwave oven with a recess.