JPS60263037A - High-frequency heating device - Google Patents

Abstract

PURPOSE:To obtain the safety device of door switch for the high-frequency heating device, inexpensive in the cost, prominent in the durability and high in the mass-productivity thereof by a method wherein a door key is constituted by only a protuberance and a switch fixing section is formed integrally by resin. CONSTITUTION:When a door 21 is closed, the door key 22a pushes levers 23, 24 to put microswitches 8, 12 ON, the door key 22b is held by a catching section 25 and the door key 22c puts a switch 13 ON. The levers 23, 24, 26, the catching section 25 and the switch fixing sections 27, 28, 29 are formed integrally by resin and the door key unit is constituted by fitting the microswitches 8, 12, 13 into the integral body. The lever 23 is configurated so as to pivot about a supporting section A, push the actuator of the microswitch 8 by an operating section B and push the head C thereof by the door key 22a. According to this constitution, the door key 22a is loaded with only about 70% of a load necessary to operate the microswitch 8 and the operation thereof may be facilitated. When the door 21 is opened, the switch levers 23, 24, 26 and the catching section 25 are moved as shown by dotted lines in the diagram and the microswitches 8, 12, 13 may be turned OFF.

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. It is.

Conventional structure and its aids Conventionally, as shown in Fig. 1, when the door 1 is closed, the door key 3 is attached to the door 1 and pulled in one direction by a spring 2, and supported by a lever shaft 5 on a hook 4. By pushing down the metal lever 6, the actuator 9 of the microswitch 8 fixed to the frame 7 with machine screws 10 is pushed and the microswitch 8 is operated.

Therefore, since it is composed of several parts, there were many cases 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 microswitch 8, causing damage or wear to the actuator 9 of the microswitch 8, contact springs, etc. There was a problem that the life of the microswitch 8 was shortened, such as by causing a significant change in force.

In addition, as a method to solve these problems, the patent application
Structure of No. 137514 (shown in Figures 2 and 3)
is being put into practice. This consists of a door door 3 provided on the door 1 that opens and closes the opening of the heating chamber, a switch lever 6 operated by the door key 3, and the door key 3.
The switch lever 6, the hook part 12, and the switch fixing part 11 that fixes the micro switch 8 are integrated. This is the configuration to form. Therefore, unlike the configuration shown in Fig. 1, the number of parts is greatly reduced due to the configuration consisting only of microswitches and resin integrally formed parts, but the door key side includes the door key 3, the fulcrum shaft 13 of the door key, and its fulcrum shaft. Metal fittings supporting 13 (
(not shown), a spring 2, etc., and there is still room for improvement in terms of parts reduction, etc.

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

Structure of the Invention In order to achieve the above object, the high frequency heating device of the present invention includes: a plurality of door keys provided on a door for opening and closing a front opening of a heating chamber; a catch portion through which the door keys come out and engage; a plurality of switches operated by a door key, the plurality of door keys each consisting of only a fixed protrusion on the door, a catch part, a switch lever operated by the door key, and a switch fixed to the switch. It has a structure in which the fixed part and the fixed part are integrally molded from resin, and the number of component parts is extremely small.It has a door key structure with no moving parts.It is a safety device that is made of resin except for the switch, which requires extremely little assembly man-hours and is easy to mass-produce. This has the effect of providing a safety device with high safety and excellent durability.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows that the door 21 is closed and the first door key 22& is pressed to open the first door 21. Push the second lever 23.24 and press the first lever 23.24. The second microswitches 8 and 12 are turned on, the second door key 22b is held by the catch part 25, the third lever 26 is pushed by the third door key 22c, and the switch 13 is turned on. It is a figure in which it is in an ON state.

In FIG. 4, 1. Second. Third lever 23.24
．． 26 and the catch part 25, and the first and second parts. The first one which fixes the third microswitch 8, 12, 13. Second
．． The third switch fixing parts 27, 28, and 29 are integrally molded with resin, and the first switch fixing parts 27, 28, and 29 are integrally molded with resin. Second and third microswitches 8, 12
．． It is constructed by fitting 13.

The first lever 23 has a support part A as a fulcrum, a switch operating part S to push the actuator of the first microswitch 8, and a head part C to push the first door key 22a. As a result, the first door key 22a only requires about 70% of the load required to operate the first microswitch 8, making operation easier.

Next, the second lever 24 forms a thin wall H near the fulcrum, passes through bent parts P and Q, and next to the thin wall R, there is a beveled part that comes into contact with the door key, and before the thin wall 8. There is an operation section S that presses the actuator of the second microswitch 12.

Next, the third lever 26, like the first lever 23,
It branches into two thin parts D' and H, a part B' that presses the actuator of the third switch fixing part 29, and a part C' where the third door key 22C comes into contact, and there are also two bent parts F'. , G' are also provided.

When you try to open the door 21, the first .
Second. Third door keys 22a, 22b.

22C moves to the left in Fig. 4, and as a result, the first
．． Second. The third switch levers 23, 24, and 26 are shown as dotted lines, and the first switch levers 23, 24, and 26 are shown as dotted lines. Second. The third microswitch 8i2, 13 is turned off.

The catch portion 25 also opens and separates as shown by the dotted line.

First of all. Second. Third lever 23, 24.26
The lever also has two thin-walled parts, so the movement of the door key is transmitted to a certain extent, and when a certain amount is exceeded, the other thin-walled parts allow the lever to flex even further, reducing shock to the actuator and increasing the durability of the microswitch. will improve.

Furthermore, the amount of movement of the fulcrum portion of the lever can be reduced by combining it with other thin-walled portions, resulting in improved durability.

In this way, according to this embodiment, the first . Second. Third door keys 22a, 22b.

22C has no movable parts and only requires integrally molded protruding pieces, 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 lever has an extremely good buffering effect, and since the impact force when the door closes is not directly applied to the switch, damage to the switch actuator and contact springs can be prevented, and wear on them is significantly reduced, reducing the operating force. There is less change in the temperature and durability is improved.

2 By integrating the resin, it has a double insulation structure, further increasing safety.

■ Since there are only two component parts including the switch, workability is extremely improved and manufacturing is possible at low cost.

■ The durability of the lever is improved because there are thin parts in two places, and the durability of the switch is further improved because the operation part that presses the switch and the lever head that presses the door key are separated. .

(5) Providing a bent part in the middle of the lever, a branched head and operating part, and two thin parts.If the basic structure is followed, it will be possible to adjust the shape of the door key, the large pusher of the micro switch, the shape, the current state of the installation space, etc. It is a highly durable safety device with a unique design that allows for free design.

6) The door key has two functions: the part that presses the switch lever and the part that is held by the catch, but both are molded with fixed protrusions that protrude from the door, so springs, fulcrum shafts, etc. This is unnecessary, there is no need to consider their durability, and the number of parts is reduced, greatly contributing to cost reduction and reduction in assembly man-hours.

■ The catch part that holds the door key, part of the lever, the switch fixing part, the boss part that fixes the safety device to the main body, etc. are integrally molded with resin, so there is no need to adjust the design dimensions and assembly is completed by simply fitting the switch. It is a safety device with good dimensional stability and ease of assembly.

[Brief Description of the Drawings] Fig. 1 is a partially sectional side view showing a safety device of a conventional high-frequency heating device, and Figs. 2 and 3 are side views showing safety devices of other conventional high-frequency heating devices. 4 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 same device; FIG. FIG. 2 is a perspective view of the main part of the device. 8...First microswitch (for short circuit), 12...Second microswitch (for main circuit opening/closing), 13...Third microswitch (
Main circuit opening/closing), 21...Door, 22...
...Door key, 23...First lever, 24.
...Second lever, 25...Catch part, 26...Lever, 27...First switch fixing part, 28... Second switch fixing part, 29...Third switch fixing part. Figure 1 Figure 2 Figure 4 Figure 6

Claims (2)

[Claims] (1) comprising a plurality of door keys provided on a door for opening and closing a front opening of a heating chamber, a catch part into which the door keys appear and engage, and a plurality of locks operated by the plurality of door keys, A high-frequency heating device in which the door keys are located on the door and consist only of fixed protrusions. (2) The high-frequency heating device according to claim 1, wherein the catch part, the switch lever operated by the door key, and the Nui nochi fixing part for fixing the switch are integrally molded from resin.