JPS5847669Y2 - Koushiyuuhakanetsouchi - 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.

Conventional configuration and problems The door switch of conventional high-frequency heating equipment operates in conjunction with the opening of the door.
It had a door switch pin designed to open the high-frequency oscillator power supply circuit and prevent microwaves from leaking through the gap between the door and the front plate of the heating chamber.

However, the door switch is located inside the rear surface of the front plate of the heating chamber, and the door switch pin passes through a through hole in the front plate of the heating chamber and presses the actuator of the door switch.
It is normal to have a configuration that operates a switch,
Therefore, if the actuator was pushed in with a thin pin-shaped rod while the door was open, the microwave power circuit would be closed, which was extremely dangerous.

Purpose of the Invention It is an object of the present invention to eliminate the above-mentioned drawbacks of the prior art and to make it impossible to operate the safety switch from the outside when the door is opened.

Structure of the Invention In order to achieve the above object, the present invention provides a safety switch at the rear of the front plate of the heating chamber, and a switch pin for operating the safety switch on the door side, so that the heating is activated in conjunction with opening and closing of the door. A door arm that retracts from the front panel of the room is provided, and a roller is provided as a fulcrum for the door arm to rotate.
A cover plate is provided that covers at least an operating part of the safety switch when the door is opened, and a spring is provided that links the cover plate with the protrusion and retraction of the door arm via a connecting rod and always biases the cover plate in the cover direction. The door spring is provided with a biasing force greater than the biasing force of the spring when the door is opened.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing one embodiment thereof.

In the figure, 1 is a high-frequency heating device, and the front plate 3 of the heating chamber 2 is
The door 5 has a through hole 4 in a part thereof, and the door 5 is provided with a door switch pin 6.

In this case, it is a side-opening door, which opens around the axis 7.

A cover plate 8 is provided on the rear surface of the front plate 3 in the heating chamber 2 and slides along the rear surface of the front plate 3 and covers the through hole 4.
is provided.

Reference numeral 9 denotes a door arm whose one end is rotatably supported by the door 5, and whose other end rotatably supports a connecting rod 10 whose one end is rotatably supported by the cover plate 8. There is.

Reference numeral 11 denotes a hole provided in the cover plate 8, and is provided in a position where the door switch pin 6 can penetrate through the through hole 4 and press the actuator 13 of the safety switch 12 when the door 5 is closed.

14 is a spring that always urges the cover plate 8 in the closing direction of the through hole 4; 15 is a support portion for the door arm 9; 16 is a rotatable roller that the door arm 9 is always in contact with; 17 is the door arm A door spring 9 biases the door spring 9 in a direction to rotate the roller 16 as a fulcrum, and a door spring 18 is an exterior bottom plate of the heating chamber 2.

In the above configuration, when the door 5 is opened, the door arm 9 is pulled out in conjunction with this.

At the same time, the cover plate 8 slides in the direction of the arrow shown in FIG. 2 via a connecting rod 10 that is rotatably supported in conjunction with the door arm 9.

Therefore, the hole 11 of the cover plate 8 is moved in the direction of the arrow by the biasing force of the spring 14, and the cover plate 8 closes the through hole 4.

As a result, the actuator 13 of the safety switch 12 cannot be touched from the outside with a pin or a thin rod, thereby preventing mischief.

Next, when the door 5 is closed, the cover plate 8 moves in the direction of arrow b', contrary to when the door 5 is opened, and the through hole 4 and the hole 11 provided in the cover plate 8 match. .

Therefore, the door switch pin 6 passes through the through hole 4 and the hole 11, presses the actuator 13, and closes the microwave power circuit.

Here, in the above embodiment, the cover plate 8 closes the through hole 4 through which the door switch pin 6 passes when the door 5 is opened;
Although the actuator 13 of the safety switch 12 cannot be operated, this configuration can also be applied to a through hole of this type of safety switch operated by a door pin or the like.

Further, the door 5 needs to have a locking structure that can be opened and closed smoothly, can be opened more than a certain level, and can be opened and controlled at an angle so as not to damage the door 5 or other cooking appliances located nearby.

In order to make the locking structure durable and strong, and to minimize the moment force received when the door 5 opens, the door arm 9 of the door 5 is designed to be durable and strong.
Needless to say, the support part 15 is as far away from the shaft 7 as possible and the closer it is to the tip of the door 5, the better.

Further, the opening angle of the door 5 is set to 90° as much as possible so as not to cause any inconvenience when taking items in and out of the heating chamber 2.
The above is desirable.

Therefore, the roller 16 and door spring 17, which restrict the movement of the door arm 9 and also serve to lock the door 5, will be described.

As described above, if the position of the support portion 15 of the door arm 9 and the opening angle of the door 5 are taken into consideration, the shape of the door arm 9 that should fulfill the desired role can be easily determined.

Further, the movement of the cover plate 8 is made smooth and durable, and the cover plate 8 cannot be easily operated from the outside.
Moreover, if the door switch pin 6 is near the actuator 13 and moves away from it, the cover plate 8 immediately moves away from the actuator 13.
If you cover the object and get close to it, you will be required to remove the cover as soon as possible.

Therefore, when the cover plate 8 is covered in conjunction with the movement of the door 5, a certain force (a force that cannot be operated from the outside) must be applied.

In order to guide and evenly irradiate radio waves into the heating chamber 2, a stirrer blade (not shown) or the like is installed above the heating chamber 2, and a duct (
(not shown) is often provided outside and above the heating chamber 2.

Therefore, the mounting location of the cover plate 8 and the like is the exterior bottom plate 18 outside the heating chamber 2.

In that case, if productivity etc. are considered, the door arm 9 and the door switch pin 6 are attached to the door 5, and the cover plate 8. Spring 14. Safety switch 12. The connecting rod 10 and the like are attached to the exterior bottom plate 18.

After attaching the heating chamber 2 to the exterior bottom plate 18, the door 5 will be attached, and the work of connecting and fixing the door arm 9 and the connecting rod 10 will be carried out directly below the heating chamber 2, which is indicated by the dotted line in FIG. must be done.

Moreover, as mentioned above, the support part 15 of the door arm 9 is connected to the door 5.
Must be attached to the tip of the

However, with the above configuration, it is possible to avoid connecting the door arm 9 and the connecting rod 10 directly under the heating chamber 2, and the connecting rod 10 can be connected between the door arm 9 and the cover plate 8. By providing the spring 14., the force of the arrows a and a' is converted into the force of the arrows a and b'. With the help of the door spring 17, this can be done easily and without difficulty.

Next, the relationship between the spring 14 and the door spring 17 will be described.

The door spring 17 must have a force that brings the door 5 into close contact with the front plate 3 of the heating chamber 2 when the door 5 is opened.

Further, the spring 14 is required to always bias the cover plate 8 in one direction (rightward in FIG. 2).

The forces of the spring 14 and the door spring 17 influence each other via the connecting rod 10.

When the door 5 is closed, the force of the door spring 17 is close to the minimum and the force of the spring 14 is maximum.

Therefore, at that time, if the force of the spring 14 is greater than the force of the spring 14, the role of the door spring 17 (to bring the door 5 into close contact with the front plate 3) is not fulfilled, and the door 5 receives a force that tends to separate it from the front plate 3. work.

As a result, a gap is created between the door 5 and the front plate 3, and the role of the door 5 in shielding microwaves is reduced.

Therefore, care must be taken so that the force of the door spring 17 is greater than the force of the spring 14 when the door 5 is closed.

Furthermore, another safety switch (
(not shown), the force of the door spring 17 is greater than the force of the spring 14, so a constant force is always applied to the safety switch in one direction, allowing it to operate smoothly.

As is clear from the above embodiments, the high frequency heating device of the present invention includes a safety switch provided at the rear of the front plate of the heating chamber and a switch pin for operating the safety switch on the door side.
A door arm that protrudes and retracts from the front plate of the heating chamber in conjunction with opening and closing of the door is provided, and a cover plate is provided that covers at least an actuating part of the safety switch when the door is opened, and the cover plate is connected via a connecting rod. A spring is provided on the cover plate that is linked to the protrusion and retraction of the door arm and always biases the cover plate in the cover direction, and has a biasing force greater than the biasing force of the spring when the door is opened. It is equipped with a door spring that always urges the door in the closing direction.

Therefore, when the door is open, the actuator of the safety switch is always covered by the cover plate, and even if a thin rod or the like is pushed through the through hole in this state, the cover plate cannot be pushed away by the rod and the actuator cannot be pressed.

Therefore, no matter what kind of mischief a child may do, the actuator of the safety switch cannot be pressed when the door is open, making it extremely safe. Because of this, we can provide it at a low price.

Further, according to the present invention, such a safety structure can be maintained for a long period of time, and the user does not feel uneasy.

In other words, in the present invention, since the cover plate is linked to the door arm, the door switch pin will not collide with the cover plate, and therefore the door switch pin will be deformed and will no longer fit into the through hole of the front plate of the heating chamber. The length of the door switch pin is shortened by the amount of deformation, so that the opening and closing operations of the safety switch cannot be performed reliably, and the abnormal noise caused by this collision does not make the user feel uneasy.

Furthermore, according to the present invention, the door is provided with only one door switch pin like the conventional one, making it easier to use and more convenient.

In other words, in the case of a door that opens vertically, it is often used as a temporary storage stand when taking food in and out.If this door has many door switch pins, the door switch pins will make it difficult to place food on the door. Otherwise, at this time, the cuffs may get caught on the door switch pin and break, or food may spill, but the present invention does not eliminate these problems.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a high-frequency heating device showing an embodiment of the present invention when the door is opened, and FIG. 2 is a cross-sectional top view taken along line AA' in FIG. 1. 2...Heating chamber, 3...Front plate, 5...
...Door, 6...Door switch pin, 8...
... Cover plate, 9 ... Door arm, 10 ...
... Connecting rod, 12 ... Safety switch, 13.
...Actuator, 14...Spring, 17...Door spring.

Claims (1)

[Scope of utility model registration request] A safety switch is provided at the rear of the front plate of the heating chamber, a switch pin for activating the safety switch is provided on the door side, and a door arm that protrudes and retracts from the front plate of the heating chamber in conjunction with opening and closing of the door is provided, and this door arm A roller serving as a rotating fulcrum is provided, a cover plate is provided to cover at least the actuating part of the safety switch when the door is opened, and the cover plate is interlocked with the protrusion and retraction of the door arm via a connecting rod. 1. A high-frequency heating device comprising: a door spring that always biases a door in a covering direction; and a door spring having a biasing force greater than the biasing force of the spring when the door is opened.