JP2576992Y2 - Microwave oven interlock switch mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlock switch mechanism for a microwave oven.

[0002]

2. Description of the Related Art FIG. 6 shows an appearance of a microwave oven 15, in which 10 is a door, 16 is a high frequency generator provided inside, 17 is a cooling fan, and 18 is a power transformer. FIG. 5 shows a main part of a cross-sectional view taken along the line AA of FIG. 6, and shows an interlock switch mechanism inside the door 10, and the interlock switches are usually a monitor switch 1, a primary switch 2, and a secondary switch. 3 switches.

The monitor switch 1 among the three switches functions to detect the opening / closing of the door 10 and to notify the CPU of the opening / closing of the door 10. The monitor switch 1 is configured to operate prior to the other switches 2 and 3. I have. That is, when the door 10 is closed, the monitor switch 1 is turned on first for the other switches 2 and 3, and when the door 10 is opened, the monitor switch 1 is finally turned off for the other switches 2 and 3. Is configured. The primary switch 2 and the secondary switch 3 are safety switches.
Door opening / closing is detected through the circuit.

In FIG. 5, when the door 10 is closed, the hook link 4 presses the button 1A via the arm 11 of the monitor switch 1 with its lower end 4B, whereby the monitor switch 1 is first turned on. Next, the primary switch 2 is turned on by pressing the button 2A with the tip 4A of the hook link 4, and then the button 3A is pressed by turning the switch lever 12, so that the secondary switch 3 is turned on. Conversely, when the door 10 is opened, the monitor switch 1 is finally turned off after the primary switch 2 and the secondary switch 3 are turned off. In addition, 6 is a door open lever, 7 is a door open button, and 8 is a spring.

[0005]

In the conventional interlock switch mechanism of the microwave oven, the arm 11 pressed by the tip 4B of the hook link 4 is easily deformed.
In this case, there is a problem that the interlock switch does not operate normally.

The present invention has been made in view of the above-described problems, and has as its object to provide an interlock switch mechanism of a microwave oven in which an interlock switch operates normally.

[0007]

In order to achieve the above object, the present invention has a monitor switch and other safety switches. When the door is closed, the monitor switch is turned on first and when the door is opened. In a microwave oven interlock switch mechanism configured to turn off a monitor switch lastly, a hook link that operates in conjunction with opening and closing of a door, and a switch lever that is rotated by being pressed at one end by the tip of the hook link And the monitor switch and other safety switches are disposed near the other end of the switch lever, and the other end of the switch lever has the other end of the switch lever when the door is closed corresponding to opening and closing of the door. The monitor switch is turned on before the safety switch in the vicinity, and when the door is open, the safety switch near the other end of the switch lever is turned on. It is characterized in that the formation of the stepped portion acts to off after the monitor switch than a switch.

[0008]

The switch lever pressed by the hook link in response to the opening and closing of the door is provided with a step which works to turn off the monitor switch last and turn it on first in response to the opening and closing of the door. The switch lever allows the interlock switch to operate normally.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an interlock switch mechanism of a microwave oven according to the present invention. A monitor switch 1 and a secondary switch 3 are connected to a support plate 13 as shown in FIG.
Mounted on top of it. 5 is a switch lever and one end 5 pressed by the tip 4B of the hook link 4.
A, and the other end 5B of pressing the button 1A of the monitor switch 1 or the button 3A of the secondary switch 3 when rotated about the fulcrum P.

Here, the other end 5B of the switch lever 5
A stepped portion 9 is formed to actuate the monitor switch 1 to be turned off last and turned on first in response to opening and closing of the door 10. The same parts as those in FIG. 5 are indicated by the same numbers.

Next, the operation of this embodiment will be described. Door 10
When the door is closed, the hook link 4 moves downward, and as shown in FIG.
Press. As a result, the switch lever 5 rotates about the fulcrum P, and the step portion 9 of the other end 5B first presses the button 1A of the monitor switch 1 based on the above-described operation principle.
Turns on. Next, the button 3A of the secondary switch 3 is pressed by the step portion 9 as shown in FIG. 4 with a slight delay, so that the secondary switch 3 is turned on. Further, when the button 2A is pressed by the tip 4A of the hook link 4, the primary switch 2 is turned on. In any case, among the three switches, the monitor switch 1 is turned on preferentially, and then the primary switch 2 or the secondary switch 3 is turned on.

When the door 10 is opened, after the primary switch 2 and the secondary switch 3 are turned off, the button 1A of the monitor switch 1 is finally released by the step 9 at the other end 5B of the switch lever 5,
The monitor switch 1 turns off.

As described above, according to the present embodiment, the monitor switch 1 is finally turned off and turned on first at the other end of the switch lever 5 pivoting about the fulcrum P in response to opening and closing of the door. Is formed, so that when the door 10 is opened or closed, the tip 4 of the hook link 4
By pressing one end 5A of the switch lever 5 with B to control the switch lever 5, the interlock switch can be operated normally.

[0014]

As described above, according to the present invention, the switch lever pressed by the hook link 4 in response to the opening and closing of the door causes the monitor switch to be turned off lastly in response to the opening and closing of the door, and to be performed first. Since the step portion acting to turn on is formed, the interlock switch mechanism can be operated normally.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of mounting a plurality of switches used in the embodiment.

FIG. 3 is a schematic diagram illustrating the operation of the present embodiment.

FIG. 4 is a schematic diagram illustrating another operation of the present embodiment.

FIG. 5 is a sectional view showing a conventional example.

FIG. 6 is an external view showing a microwave oven.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Monitor switch 2 Primary switch 3 Secondary switch 4 Hook link 5 Switch lever 9 Step part 10 Door

Claims (1)

(57) [Scope of request for utility model registration] 1. A monitor switch and other safety switches.
It has a switch to turn on first monitor switch when the door is closed, and the interlock switch mechanism configured microwave oven so as to turn off the monitor switch last when opening the door, in conjunction with the opening and closing of the door a hook link operating in one end is pressed by the tip of the hook links provided with rotation to Luz switch lever, and
The monitor switch is provided near the other end of the switch lever.
Place another safety switch and the switch
At the other end of the lever, when the door is closed,
The monitor is higher than the safety switch near the other end of the switch lever.
Turn on the switch first, and when the door is open,
Monitor switch rather than safety switch near the other end of the lever
A step portion that works so as to turn off later .