JPH036418B2 - - 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 Problems Conventionally, as shown in FIG. 1, when the door 1 is closed, a door key 3 is attached to the door 1 and pulled downward by a spring 2, and a lever is attached to the hook 4. By pushing downward a metal lever 6 supported by a shaft 5, an actuator 9 of a micro switch 8 fixed to a frame 7 with machine screws 10 is pushed and the micro switch 8 is operated. 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 because it has little cushioning properties, the impact force of closing the door 1 is directly applied to the micro switch 8, and the actuator 9 of the micro switch 8, contact springs, etc. are damaged or worn, resulting in operating force. causing significant changes, etc.
There was a problem that shortened the life of the micro switch 8.

In the control circuit shown in FIG. 6, as one of the safety devices for the power transformer 11 forming the oscillation circuit of the high-frequency heating device, a micro switch A1 is used which is linked to the opening and closing of the door for loading and unloading the heated object at the front of the heating chamber.
2, B13 and micro switch A12, B1
3 has an abnormality due to contact welding or the like and is fired, a micro switch 8 is provided that turns on when the door opens before supplying power to the power transformer 11 that generates radio waves.
13 and short circuit is formed and fuse 14 is connected.
It is turned off and there is no radio waves.

Therefore, there are at least three micro switches 12, 13, and 8 that are linked to the opening and closing of the door. There is a state of Therefore, each of them had the problem of shortening the life of the microswitch 8 as described above.

OBJECT OF THE INVENTION The present invention overcomes the above-mentioned conventional drawbacks.
The purpose is to create 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 present invention provides a heating chamber, a door for opening and closing a front opening of the heating chamber, a door key provided on the door, a switch lever operated by the door key, and a switch lever operated by the door key. The switch lever is equipped with a switch that is turned on and off, and a switch mounting member to which the switch is attached.The switch lever has a contact part that comes into contact with the door key, an operation part that operates the switch, and a support part that serves as a fulcrum for the switch lever to move. Further, an elastic structure is provided between the operation part and the contact part, and the elastic structure has a
The operating part, the contact part, and the support part are integrally molded with the switch mounting member, and the operating part and the contact part of the switch lever are formed into a substantially U-shape. , the switch has a structure in which a thin wall portion or the like is provided between the operating section and the abutting section, and has the advantage of high mass productivity and excellent durability of the switch.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2, 3, 4, and 5.

Figure 2 shows the door 1 closed by the door key 3.
It is a diagram in which the lever 6 is pressed and the switch 8 is turned on.

In FIG. 2, the switch fixing part 1 fixes the hook 4, lever 6, and micro switch 8.
1 is integrally molded with resin, and a micro switch 8 is fitted into it. The lever 6 has a support part A as a fulcrum, a switch operating part B to push the actuator 9 of the micro switch 8, and a lever contact part C to be pushed by the door key 3. As a result, the door key 3 only requires about 70% of the load required to operate the micro switch 8, making operation easier.

When an attempt is made to open the door 1, the door key 3 moves upward as indicated by the dotted line, the door 1 is released, the switch lever 6 becomes as indicated by the dotted line, and the switch 8 is turned off. Next, the shape of the switch lever 6 will be described. A thin section D is formed near the fulcrum A section, and a bent section F is formed.
When the lever is pushed beyond a certain amount of movement, it branches into a lever contact part C that contacts the door key 3 and an operation part B that pushes the actuator 9 of the micro switch 8. , Since there is a thin walled part H which is a resilient structure on the side of the lever C of the contact part near the branching point to provide further elasticity, the lever of the contact part C can further move, so the actuator 9 There is less impact on the microswitch, and the durability of the microswitch is improved.

In addition, since the thin wall portion is provided in areas other than the vicinity of the fulcrum A, the amount of movement of the thin wall portion D near the fulcrum A is also small.
In addition, the thin wall portion H was also reduced. As a result, the repeated flexibility of the resin lever 6 when opening and closing the door 1 could be significantly improved. Furthermore, by providing both thin wall portions D and H, the durability, restorability, and cleaving characteristics of the switch lever 6 itself are improved.

FIG. 5 shows a perspective view of the exterior with only the switch lever 6 taken out.

Next, the other micro switch 12 will be described.

In Figure 2, hook 4 and micro switch 1
The switch fixing part 15 that fixes the micro switch 12 and the rotation center axis 17 of the hook spacer 16 are integrally molded with resin, and the micro switch 12 is fixed to the switch fixing part 1.
It is constructed by fitting in 5.

When the hook spacer 16 is inserted as shown by the arrow in FIG. 3 of the A-A' partial cross-sectional view in FIG.
When the hook spacer 16 is pushed inward and pushed in further, the hook spacer 16 is engaged with the L-shaped protrusion 18, as shown in FIG. 3, and is prevented from falling off.

Therefore, the unit can be mass-produced because it can be temporarily stocked and the operation of the microswitch 12 can be checked in the assembled state shown in FIG. 4.

When the entire unit shown in FIG. 4 is fixed to the main body, two parts are fixed to the main body: the integrally formed boss 18 and the rotation center shaft 17. Therefore, due to the advantages that the main body and the door 1, the door key 3 and the hook 4, and the door key 3 and the hook spacer 16 are each integrally molded, and the rotation center shaft 17 also serves as a boss for fixing the main body, the dimensions are stably fixed. It can be done.

As described above, the hook 4, the lever 6, the switch fixing parts 11, 15, the pivot axis 17 of the hook spacer 16, the main body fixing boss, etc. are integrally molded with resin, and the switches 8, 12 are fitted into the structure. With its simple structure and reliable operation, an inexpensive and durable safety device has become possible.

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

(1) When the door is closed, the door key is directly touched by the contact part of the switch lever that contacts the door key, and the door key does not come into direct contact with the operating part of the switch lever that operates the switch. Since an elastic structure is provided between the contact part and the contact part, the force applied to the switch is reduced, preventing damage to the switch's actuator and contact springs, and significantly reducing wear on these parts, making the switch's operation easier. There is less change in force and durability is improved.

(2) By integrating the resin, it has a double insulation structure.

(3) Since the number of component parts is 2 including the switch, assembly workability and parts inventory management are extremely simple, resulting in inexpensive manufacturing.

(4) Up to two of the three micro-switches are molded from the same resin, and the switches are attached using the springiness of the resin, and the operating levers and hook spacers are also made using the elasticity of the resin. Since each part is integrally molded with resin, there is no need to adjust the installation between each part, so it can be manufactured with high precision and at low cost.

(5) The durability of the lever is improved because there are thin parts in two places.Also, the durability of the switch is further improved because the lever is separated from the operation part that presses the switch and the lever contact part that presses the door key. It is.

(6) If the basic idea of providing a bent part, a branched contact part and an operating part, and two thin parts in the middle of the lever is followed, the shape of the door key, the size and shape of the two micro switches, and the installation space will be reduced. It is a highly durable safety device that has a high degree of design freedom and can be designed freely taking into account the current situation.

[Brief explanation of the drawing]

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 partially sectional side views showing a safety device of a high-frequency heating device according to an embodiment of the present invention. FIG. 4 is a perspective view of the main parts of the device, FIG. 5 is a perspective view of the switch lever 6 of the device, and FIG. 6 is a control circuit diagram of a general high-frequency heating device. 1...Door, 2...Spring, 3...Door key, 4
...Futsuku, 6...Lever (switch lever),
8...Micro switch, 9...Switch actuator, A...Support part, B...Switch operating part, C...Contact part, D...First thin part, H...Second thin part, F ...Bending part, G... Branching point, 10...
...Machine screw, 12, 13...Micro switch, 1
1...Power transformer, 15...Switch fixing part,
16...Hook spacer, 17...Rotation center shaft,
18...L-shaped protrusion.

Claims (1)

[Scope of Claims] 1. A heating chamber, a door for opening and closing a front opening of the heating chamber, a door key provided on the door, a switch lever operated by the door key, and a switch lever operated by the switch lever. The switch lever is equipped with a switch that is turned on and off by turning it on and off, and a switch mounting member to which the switch is attached, and the switch lever serves as a contact part that comes into contact with the door key, an operating part that operates the switch, and a fulcrum on which the switch lever moves. furthermore, an elastic structure is provided between the operation section and the contact section, and the elastic structure, the operation section, the contact section, and the support section are integrated into the switch mounting member. A high-frequency heating device configured to perform molding. 2. The high-frequency heating device according to claim 1, wherein the operating portion and the contact portion of the switch lever are formed in a substantially U-shape. 3. The high-frequency heating device according to claim 1, wherein the elastic structure of the switch lever has a thin wall portion formed between the operating portion and the contact portion.