JPH0480293B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a safety device for a high-frequency heating device, and provides a door switch safety device for a high-frequency heating device that is inexpensive, has excellent durability, and is highly mass-producible. be.

Conventional structure and its problems Conventionally, as shown in Fig. 1, when the door 1 is closed, the lever shaft is attached to the hook 4 by the door key 3 which is attached to the door 1 and pulled downward by the spring 2. By pushing downward a metal lever 6 supported by a frame 7, an actuator 9 of a micro switch 8 fixed to a frame 7 with a machine screw 10 is pushed, thereby operating the micro switch 8.

Therefore, since it is composed of several parts, there are many problems of malfunction. In addition, the lever 6 is a rigid body made of sheet metal and has low cushioning properties, so the impact force when the door 1 closes is directly applied to the micro switch 8, causing damage or wear to the actuator 9 of the micro switch 8, contact springs, etc. There was a problem that the life of the micro switch 8 was shortened, such as a significant change in force.

In addition, as a method to solve these problems, Japanese Patent Application No. 1983-137514 (see Japanese Patent Publication No. 2-25101)
The structure (shown in FIGS. 2 and 3) is in practical use. This includes a door key 3 provided on the door 1 for opening and closing the opening of the heating chamber, a switch lever 6 operated by the door key 3, a hook part 12 with which the door key 3 is removably engaged. The micro switch 8 is turned on and off by the switch lever 6, and the switch lever 6, the hook part 12, and a switch fixing part 11 for fixing the micro switch 8 are integrally formed. Therefore, unlike the configuration shown in Fig. 1, the number of parts is greatly reduced due to the configuration consisting only of the micro switch and the integrally molded resin part, but the door key side has the door key 3, the fulcrum shaft 13 of the door key, and the fulcrum shaft 13 of the door key. It is composed of a metal fitting (not shown) that supports the shaft 13, a spring 2, etc., and there remains room for improvement in terms of parts reduction and the like.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a safety device with a structure that is highly mass-producible and to improve its durability.

Structure of the Invention In order to achieve the above-mentioned object, the high-frequency heating device of the present invention operates a plurality of switches provided on the heating chamber side as the door provided on the door for opening and closing the front opening of the heating chamber is opened and closed. A plurality of keys that open and close the power supply, and a key that engages with a catch part provided on the heating chamber side when the door is closed, maintains the closed state of the door, and detaches from the catch part when pulled when the door is opened. The plurality of door keys have a door key, and each of the plurality of door keys is composed of only a fixed protrusion on the door, and includes a catch part, a switch lever operated by the door key, and a switch fixing part for fixing the switch. It is integrally molded from resin, has an extremely small number of component parts, has a door key structure with no moving parts, and is a safety device made of resin, except for the switch, which requires extremely few assembly steps, is highly mass-producible, and is durable. This has the effect of providing an excellent safety device.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below based on the drawings.

FIG. 4 shows the door 21 being closed and the first door key 2
2a, push the first and second levers 23 and 24, turn on the first and second micro switches 8 and 12, and press the second door key 2a.
2b is held by the catch part 25, and the third
This is a diagram in which the third lever 26 is pushed using the door key 22c, and the switch 13 is turned on.

In FIG. 4, the first, second and third levers 2
3, 24, 26, the catch part 25, and the first, second, and third switch fixing parts 2 that fix the first, second, and third micro switches 8, 12, and 13.
7, 28, 29 are integrally molded with resin, and the first, second, and third microswitches 8, 12, and 13 are fitted.

The first lever 23 uses the support part A as a fulcrum,
The actuator of the first micro switch 8 is pressed by the switch operation part B, and the head part C is pressed by the first door key 22a. This allows the first
The door key 22a requires only about 70% of the load required to operate the first micro switch 8, making it easy to operate.

Next, the second lever 24 has a thin wall H near the fulcrum K.
After passing through the bent parts P and Q, there is a surface L part next to the thin part R that comes into contact with the door key, and the thin part R
There is an operation section S that pushes the actuator of the second micro switch 12 in front of the section.

Next, the third lever 26, like the first lever 23, has two thin parts D' and H', and a part B' that presses the actuator of the third switch fixing part 29.
It branches into a portion C' that the third door key 22c comes into contact with, and has two bent portions F' and G'.

When an attempt is made to open the door 21, the first, second, and third door keys 22a, 22 are activated along with the door 21.
b, 22c move to the left in FIG. 4, and the first, second and third switch levers 23,
24, 26 are like dotted lines, the first, second,
The third microswitches 8, 12, and 13 are turned off. The catch portion 25 also opens and separates as shown by the dotted line.

Which of the first, second and third levers 23, 2
4 and 26 also have two thin parts, so they transmit the movement of the door key to a certain extent, and if it exceeds a certain amount,
Other thin parts allow the lever to flex more, reducing impact on the actuator and improving the durability of the micro switch.

Furthermore, the amount of movement of the fulcrum portion of the lever can be reduced even with other thin-walled portions, so durability is improved.

In this way, according to this embodiment, the first, second and third door keys 22a, 22b, 2 on the door 21 side
2c has no movable parts and only needs to be integrally molded with a protruding piece, which has the effect of reducing the number of parts and the number of assembly plants.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) The door key has two functions: a part that presses the switch lever and a part that is held in the catch part, but both are molded with a fixed protrusion that protrudes from the door, so there is no spring or There is no need for a fulcrum shaft or the like, so there is no need to consider their durability, and the number of these parts can be reduced, reducing costs and assembly man-hours, resulting in high mass productivity.

(2) The number of component parts is 2: an integrally molded product and a switch.
Since it becomes a point, workability is extremely good and mass productivity is high.

(3) Since the catch part that holds the door key, the lever part, and the switch fixing part are integrally molded from resin, the assembly is completed by simply fitting the switch without adjusting the design dimensions, resulting in excellent dimensional stability and ease of assembly. is highly mass-producible.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing a safety device of a conventional high-frequency heating device, FIGS. 2 and 3 are partially sectional side views showing a safety device of another conventional high-frequency heating device, and FIG. The figure is a partially sectional side view showing a safety device of a high-frequency heating device according to an embodiment of the present invention, FIG. 5 is an external perspective view of the switch lever and catch portion of the device, and FIG. 6 is an external appearance of the main parts of the device. FIG. 8...First micro switch (for short circuit), 12...Second micro switch (for opening/closing main circuit), 13...Third micro switch (for opening/closing main circuit), 21...Door, 22 ...door key,
23...first lever, 24...second lever,
25...Catch part, 26...Lever, 27...
1st switch fixing part, 28...2nd switch fixing part, 29...3rd switch fixing part.

Claims (1)

[Claims] 1 Consisting of a heating chamber that accommodates food, a high-frequency power supply that supplies high-frequency output to the heating chamber, and a door that can be opened and closed in the front of the heating chamber, and when the door is opened and closed, the door opens and closes on the heating chamber side. a plurality of keys that open and close the high-frequency power supply by operating a plurality of switches provided in the door; and a plurality of keys that engage with a catch portion provided on the heating chamber side when the door is closed to maintain the closed state of the door, and are pulled when the door is opened. Accordingly, the plurality of door keys are composed of only a fixed protruding part of the door, and the plurality of door keys are composed of only a fixed protrusion part and are connected to the catch part provided on the heating chamber side. A high-frequency heating device having a structure in which levers of the plurality of switches operated by the door key and a fixing part for fixing the switches are integrally molded from resin.