KR19980030340U - Microwave Interlock Mechanism - Google Patents

Abstract

The present invention discloses an improved interlock mechanism of a microwave oven.

Conventionally, since the monitor interlock switch and the first interlock switch are directly operated by the upper and lower hooks installed in the door, and the second interlock switch is operated by the lock lever interlocked by the lower hook, the structure is complicated by increasing the number of parts. In particular, there were many concerns about malfunction caused by the change of position of lock lever.

In the present invention, the monitor interlock switch and the second interlock switch are arranged in a substantially V-shape so that their contacts face each other, and the first and second presses of the contacts of the monitor interlock switch and the second interlock switch respectively on the head main surface of the lower hook. The contact surfaces were formed, so that the interlock switches could be accurately operated with only the upper and lower hooks of the door without a separate lock lever.

Description

Microwave Interlock Mechanism

The present invention relates to a microwave oven, and more particularly, an interlock mechanism for blocking the high frequency radiation and preventing the high frequency leakage to the outside when the door is opened during operation. ).

In FIG. 1, the microwave is placed on a tray T provided in a cavity K of a cabinet C, and then oscillated in a magnetron (not shown). A device for cooking by molecular resonance of food by irradiating food to be cooked with high frequency.

By the way, since the high frequency adversely affects the human body, the leakage to the outside of the cooking chamber must be completely blocked. Accordingly, the microwave oven is generally provided with an interlock mechanism for properly controlling the operation of the magnetron by supplying or cutting off power to the high voltage part depending on whether the door D for opening and closing the cooking chamber is opened.

2 shows a conventional configuration of such an interlock mechanism. This is because when the door D is closed, the upper and lower hooks 6 and 7 provided at the free end side of the door D are locked to the locking hole H formed in the front plate P of the cabinet C. Each is fitted. Then, the head 7a of the lower hook 7 presses the contact point of the monitor interlock switch 2 to turn on the monitor interlock switch 2, thereby detecting the closing of the door D. . The upper and lower hooks 6 and 7 are then moved downward by the hook springs 8 to elastically engage the locks 1 to secure the door D. Then, the lock lever (5) hinged to the lock (1) is rotated downward by the lower hook (7) to contact the contact of the second interlock switch (4) by the second interlock switch (4) And the head 6a of the upper hook 6 presses the contact point of the first interlock switch 3 to turn on the first interlock switch 3 to supply power to the high voltage part.

However, such a conventional interlock mechanism operates the second interlock switch 4 by the rotational movement of a separate lock lever 5 that is interlocked by the lower hook 7, thereby increasing the number of components and causing a cost increase. There was a complicated problem. In addition, there is also a problem that there is a lot of concerns that the malfunction caused by the external shock and the like, especially the change of the fixed position of the lock lever (5).

It is an object of the present invention to provide an interlock mechanism of a microwave oven capable of accurately operating a monitor interlock switch and a first and second interlock switch with only an upper and a lower hook without a separate lock lever in view of the above-described conventional problems.

In order to achieve the above object, an interlock mechanism of a microwave oven according to the present invention includes a lock installed in an electrical cabinet of a cabinet, a monitor interlock switch installed in the lock and detecting whether a door for opening and closing a cooking chamber is opened and closed. First and second interlock switches installed on the first and second interlock switches to supply or cut power to the high voltage part according to whether the door is opened or closed, and an upper hook to lock the door and to operate the first interlock switch. And an interlock mechanism of a microwave oven having a lower hook for operating a monitor interlock switch and a second interlock switch, wherein the monitor interlock switch and the second interlock switch are arranged in a substantially V-shape such that the contacts thereof face each other, First and second pressing the contacts of the monitor interlock switch and the second interlock switch on the head main surface, respectively; It characterized in that the two contact surfaces are formed respectively.

Accordingly, the present invention can accurately operate the monitor interlock switch and the first and second interlock switches using only the upper and lower hooks without having a separate lock lever as in the prior art, thereby improving the assemblability of the microwave oven and reducing the cost. It is effective on the back.

1 is a perspective view of a typical microwave oven,

2 is a side view showing a conventional interlock mechanism;

Figure 3 is an exploded side view showing the interlock mechanism according to the present invention,

Figure 4 is a side view of the coupling state.

<Description of the code | symbol about the principal part of drawing>

D: door P: front panel

H1, H2: upper and lower locking holes (of faceplate)

11: lock

12: monitor interlock switch

13, 14: first and second interlock switch

16, 18: upper and lower hooks

19a, 19b: first and second contact surfaces (of the lower hook)

20: hook spring

Hereinafter, a preferred embodiment of the microwave interlock mechanism according to the present invention will be described in detail with reference to the accompanying drawings.

3 and 4, the interlock mechanism of the microwave oven according to the present invention is provided with a lock 11 at the rear surface of the front plate P so that the interlock mechanism of the microwave oven is located in the electrical chamber R of the cabinet C. . A monitor interlock switch for detecting whether the door D that opens and closes the cooking chamber K at a predetermined position of the lock 11, for example, a position corresponding to the lower locking hole H2 of the front plate P ( 12 is provided such that its contact 12a faces the lower locking hole H2. In addition, the lock 11 at a position corresponding to the upper and lower locking holes H1 of the front plate P is provided with a high voltage transformer such as a high voltage trans and a magnetron depending on whether the door D is opened or closed. The first and second interlock switches 13 and 14 for supplying or interrupting the supply are provided so that the contacts 13a and 14a face upwards, respectively.

At this time, the second interlock switch 14 is disposed in close proximity to the monitor interlock switch 12 so as to be substantially V-shaped so that the contact point 14a faces the contact point 12a of the monitor interlock switch 12 according to the feature of the present invention. .

On the other hand, the door D is elastically locked to the lock 11 through the upper and lower locking holes H1 and H2 of the front plate P, thereby locking the door D and simultaneously with the monitor interlock switch 12. The upper and lower hooks 16 and 18 for manipulating the first and second interlock switches 13 and 14 are connected by the hook levers 15 so as to be movable in the vertical direction. The upper and lower hooks 16 and 18 are elastically biased downward by the hook springs 20.

That is, the upper hook 16 presses the contact point 13a of the first interlock switch 13 by moving the head 17 at the distal end thereof by the hook spring 20, and the lower hook 18 The head 19 at the tip presses the contact 12a of the monitor interlock switch 12 and presses the contact 14a of the second interlock switch 14.

Accordingly, the head 19 of the lower hook 18 has a first surface for pressing the contacts 12a and 14a of the monitor interlock switch 12 and the second interlock switch 14 on the main surface thereof according to the characteristics of the present invention. And second contact surfaces 19a and 19b.

When the door D is closed, the inventive interlock mechanism configured as described above moves the upper and lower hooks 16 and 18 upward in contact with the corresponding locking holes H1 and H2 of the front plate P. It is fitted in each locking hole (H1) (H2). Then, the first contact surface 19a of the lower hook 18 head 19 first presses the contact 12a of the monitor interlock switch 12. Accordingly, the monitor interlock switch 12 is turned on so that the door D It will detect the closing of.

Next, the upper and lower hooks 16 and 18 are moved downward by the restorative elasticity of the hook spring 20, so that the head 17 of the upper hook 16 contacts 13a of the first interlock switch 13. Press to turn on, and at the same time, the second contact surface 19b of the head 19 of the lower hook 18 presses the contact 14a of the second interlock switch 14 on. Accordingly, the first and second interlock switches 13 and 14 supply power to the high temperature portion.

On the other hand, when the door D is opened, the locking of the upper and lower hooks 16 and 18 is released, and the interlock switches 12, 13 and 14 are separated from the locking holes H1 and H2 of the front plate P. OFF to detect the opening of the door (D) and at the same time cut off the power supply to the high-pressure unit.

As described above, according to the present invention, the interlock switches can be precisely operated only by the upper and lower hooks without providing a separate lock lever as in the related art, thereby simplifying the structure. In addition, the monitor interlock switch and the second interlock switch are arranged to form a substantially V-shape, and two contact surfaces for pressing both contacts are formed on the head of the lower hook, so that both of them are operated directly. Defects can be effectively prevented.

Therefore, the present invention has an excellent effect of contributing to cost reduction as well as improving assembly and reliability of a microwave oven.

Claims (1)

A lock installed in the electrical cabinet of the cabinet, a monitor interlock switch mounted on the lock to detect whether the door for opening and closing the cooking chamber is opened, and a product installed in the lock for supplying or cutting off power to the high voltage part depending on whether the door is opened or closed. An electronic device comprising a first and second interlock switch, an upper hook installed under the door to be elastically biased to lock the door and operating the first interlock switch, and a lower hook for operating the monitor interlock switch and the second interlock switch. In the interlock mechanism of the range, The monitor interlock switch 12 and the second interlock switch 13, 14 are arranged in a substantially V-shape so that their contacts 12a, 14a face each other, First and second contact surfaces 19a for pressing the contacts 12a and 14a of the monitor interlock switch 12 and the second interlock switch 14 to the main surface 19 of the lower hook 18, respectively. 19b) are each formed interlock mechanism of the microwave oven.