JPS6363823B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a high frequency heating device, and more particularly to a high frequency heating device with improved safety against external emission of high frequency waves in the event of a failure.

TECHNICAL BACKGROUND OF THE INVENTION Microwave ovens are generally equipped with a cooking start operation section on an operation panel provided on the main body, and a cooking start switch connected to the cooking start operation section on the main body. When cooking, the object to be heated such as food is stored in the heating chamber provided in the main body, the opening of the heating chamber is closed with a door provided in the main body, and the cooking start operation section is operated. When the cooking start switch is closed, the object to be heated is heated and cooked using high frequency waves.

Problems with the Background Art However, with this technology in which the cooking start operation section is provided on the main body side, if there is some kind of failure in the main body of the microwave oven, such as a failure in the door switch, the cooking start switch can only be opened and closed. Since the operation is controlled, there is a problem in that even if the door is closed and no cooking is performed, the cooking operation will start if the cooking start switch is operated. , there is a risk of being exposed.

OBJECTS OF THE INVENTION An object of the present invention is to provide a high-frequency heating device with excellent safety that can eliminate radiation of high-frequency waves to the outside in the event of a failure.

Summary of the Invention This high frequency heating device includes a hook rotatably protruding from the back side of the door, a latch provided on the main body corresponding to the position of the hook for locking the closed door. a switch disposed near the latch with its on/off part facing in the opposite direction to the latch; a movable switch mounting plate provided with the switch and pressed by the end of a hook that engages with the latch; and a door body. a button member whose tip protrudes to the rear surface of the door body when pressed, and a slider which is movably provided adjacent to the on/off side of the switch mounting plate and moves in response to the movement of the button member only when the door is closed. and a recess provided on the switch mounting plate side of this slider, and a recess provided in the switch mounting plate corresponding to this recess, which fits into the recess when the slider is moved by the pressing operation, and the hook a convex portion that moves the switch mounting plate pressed by the slider toward the slider, and a switch operating portion that is provided on the slider and presses an on/off portion of the switch to close the switch as the switch mounting plate moves. Therefore, the heating operation does not start unless the heating chamber is closed with the door body.

Embodiment of the Invention FIGS. 1 to 4 show an embodiment of the present invention. In the figure, 1 is a main body of a microwave oven which is a high-frequency heating device. Room 2 is provided. Furthermore, a high frequency oscillation circuit (not shown) is disposed within the main body 1 to oscillate high frequency microwaves within the heating chamber 2. Further, on the front side of the main body 1, an operation panel 4 is provided adjacent to the opening of the heating chamber 2 and a cooking timer 4a is provided on the right side. Furthermore, on the front side of the main body 1, there is a side-opening door body 5 that opens and closes the opening of the heating chamber 2.
is rotatably pivoted. A door opening/closing mechanism 3 is provided on the free side of the door body 5. This door opening/closing mechanism 3 has a pair of rotatable hooks 6, 6 protruding from the back side of the door body 5 so as to be positioned vertically and facing each other, and a U-shaped handle 7 on the front side of the door body 5. is rotatably provided, and the base portions of both ends of the handle 7 are rotatably engaged with the rear ends of the hooks 6, 6. Hook insertion holes 8, 8 are provided in the front wall of the heating chamber 2 corresponding to the positions of the hooks 6, 6, and latches 8a, 8a are provided inside the hook insertion holes 8, 8, respectively. By closing the door body 5, each hook 6,
The tips of the hooks 6 can be detachably engaged with the latches 8a, 8a through the hook insertion holes 8, 8. In other words, when the door is closed, the hook 6 and the latch 8a engage to lock the closed door body 5,
Also, by rotating the handle 7, each hook 6,
The lock is released by the rotational drive of 6.

A cooking start operating section 15 is provided on the door 5 of the microwave oven, and a switch system 10 that receives the operation of the cooking starting operating section 15 is provided on the main body 1 side.

As shown in FIGS. 1 to 3, the cooking start operation section 15 is located at the most easily operated position on the surface side of the door body 5, for example, between the handles 7, and is operated by a slide rod 20 that is a button member. It is provided movably along the thickness direction. Then, the slide rod 20 is supported using a coiled return spring member 27a so that its back end (tip) can protrude from the back surface of the door body 5, and its front end is attached to the surface of the door body 5. It has a structure in which the button operation section 20a faces toward the front. In other words, by pressing the button operation part 20a, the tip of the slide rod 20 projects to the back surface of the door body 5.

On the other hand, if we explain the switch system 10, 9
A is a door switch placed directly below the upper latch 8a, and 9b is a door switch placed directly above the latch 8a. The door switch 9a is fixed with the on/off portion 9c facing the latch 8a, and is closed when the hook 6 engages with the upper latch 8a. Also door switch 9b
is arranged with the on/off portion 9c facing in the opposite direction to the latch 8a, that is, facing upward. A mounting plate 22 (corresponding to a switch mounting plate) directly above the latch 8 to which the door switch 9b is attached is movable in the vertical direction, and a return spring member 27
b is biased toward the lower latch 8a, and when the hook 6 engages with the lower latch 8a, the tip of the hook 6 is pressed upward. Further, a slider 25 is provided above the mounting plate 22 at a portion corresponding to the slide rod 20. The slider 25 is movable along the opening/closing direction of the door body 5. The slider 25 is biased toward the door body 5 by the elastic force of a coil-shaped return spring member 26 provided at the rear end, and its tip end is connected to the opening 17 formed in the front wall of the heating chamber 2.
is coming. However, the slider 25 is adapted to slide in response to the movement of the slide rod 20 only when the door body 5 is closed. At the center of the lower part of this slider 25 is a stepped portion 24.
a is provided at the upper end of the mounting plate 22, and when the slider 25 slides backward, the previous step 2
4a (corresponding to a recess) and a convex portion 23 at a position that fits with the concave portion.
(corresponding to a convex portion) is provided, and when the slide rod 20 is pressed, the mounting plate 22 pressed by the hook 6 can be moved upward by fitting into the convex portion. In other words, the mounting plate 22, which is restricted when the door is closed, can be moved by fitting the recesses and recesses. At the bottom of the slider 25, there is a switch operation section 2 that presses the on/off section 9c of the door switch 9b at a portion corresponding to the on/off section 9c when the slide rod 20 is pressed.
4b is provided so that the door switch 9b can be closed as the mounting plate 22 moves upward. In this way, the lower door switch 9b of the two is also used as the cooking start switch 18.

Therefore, when performing high-frequency cooking using the microwave oven configured as described above, the door body 5 is closed after the object to be heated is stored in the oven. This results in
As shown in FIG. 3, the upper and lower hooks 6, 6 engage with the latches 8a, 8b, and accordingly, the upper door switch 9a is closed at the tip of the hook, and the lower door switch 9b (cooking start switch 18 is closed). The mounting plate 22 (which also serves as a hook) is pressed upward by the tip of the hook. Note that since the slider 25 is not operated at this time, the slider 25
The movement of the mounting plate 22 is now restricted. Thereafter, when the button operation part 20a is pressed, the slider 25 is moved rearward by the protruding slide rod 20, and the stepped part 24a is guided to the convex part 23. As a result, the convex portion 23 comes off the lower surface of the slider 25 and fits into the step portion 24a one step lower than the convex portion 23, and the restriction of the mounting plate 22 is released. However, as shown in FIG. 4, the mounting plate 22 moves upward. Then, the on/off portion 9c of the door switch 9b is pressed against the switch operating portion 24b, and the closing operation is performed. Here, since the door switch 9b also serves as the cooking start switch 18, it is possible to drive the high frequency oscillation circuit for the time set by the cooking timer 4a.

Thus, the heating operation will not start unless the door body 5 is closed. As a result, even if there is a failure on the main body 1 side, the microwave will not be emitted from the heating chamber 2 to the outside, and there will be no danger of accidentally irradiating the microwave. Moreover, since there is an operation section on the side of the door body 5 that starts cooking, it is impossible to close the cooking start switch 18 when the door is opened, making it impossible to perform an erroneous operation. It is also very safe.

In addition, since the cooking start switch 18 is removed from the operation panel 4, the operation panel 4 can be made smaller, and it is possible to eliminate space constraints when attaching various operation parts such as a defrosting device. This makes it possible to improve the degree of freedom of use, and the effect is extremely large for microwave ovens.

Moreover, since the cooking start switch 18 is mechanically maintained in the closed state following the engagement of the hook 6, its functionality as a safety switch is high. Moreover,
Since the door switch 9b also serves as the cooking start switch 18, it is cost-effective.

However, when opening the door body 5, if the door body 5 is rotated toward the opening side while rotating the handle 7, the mounting plate 22, slider 25, and slide rod 20 will be returned to their original states by the elastic force of each return spring member. Return to

Note that the two door switches 9a and 9b may be used as the cooking start switch 18.

Further, the button operating portion 20a may be provided over a part of the handle 7 as in another embodiment shown in FIG.

Further, in the embodiment, the present invention is applied to a high-frequency heating device having a door body that opens horizontally, but it may also be applied to a high-frequency heating device having a door body that opens vertically.

Effects of the Invention This invention has a structure in which a button member is provided on the door body so that the switch on the main body side cannot be closed unless the door body is closed. Since no high frequency waves are emitted from the door, and the switch cannot be operated with the door open, there is no risk of injury from exposure to high frequency waves.

Therefore, safety can be improved. In addition, the operation panel of the main body can be made smaller, and restrictions related to the installation of various operation parts can be eliminated, which has great effects in terms of functionality.

Moreover, since the switch is mechanically maintained in the closed state following the engagement of the hook, its functionality as a safety switch is high. Moreover, since it can also be used as a door switch, it is cost-effective.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a high-frequency heating device according to an embodiment of the present invention, Fig. 2 is a perspective view showing the structure of its main parts, and Figs. 3 and 4 show the status transition when the switch is turned on. The sectional view shown in FIG. 5 is a perspective view showing the main parts of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Main body, 2...Heating chamber, 5...Door body, 6...Hook, 8a...Latch, 9a, 9b...Door switch (switch), 9c...On/off part, 20...Sliding rod (button member), 22...Mounting plate ( switch mounting plate),
23...Convex part, 24a...Step part (recessed part), 24b...Switch operation part, 25...Slider.

Claims (1)

[Claims] 1. A main body including a heating chamber for accommodating a heated part;
A door body is rotatably supported on the main body and opens and closes the opening of the heating chamber, a hook rotatably protrudes from the back side of the door body, and a hook is provided on the main body side corresponding to the position of the hook. a latch that locks the closed door body by engaging with the latch, a switch disposed near the latch with an on/off part facing in the opposite direction of the latch, and a switch provided together with the switch that engages the latch. a movable switch mounting plate that is pressed by the tip of the mating hook; a button member that is provided on the door body and whose tip protrudes to the back side of the door body when pressed; and a button member that is adjacent to the on/off side of the switch mounting plate. a slider that is movable along the door opening/closing direction and moves in response to the movement of the button member only when the door is closed; a recess provided on the switch mounting plate side of the slider; a convex portion provided on the mounting plate that engages with the concave portion when the slider is moved by the pressing operation, and moves the switch mounting plate pressed by the hook toward the slider; A high-frequency heating device comprising: a switch operation section that presses an on/off section of the switch to close the switch as a mounting plate moves.