KR200149715Y1 - Interlock mechanism of a microwave oven - Google Patents

Abstract

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

Conventionally, since the door open monitor switch is composed of an expensive micro switch, there is a problem of increasing the cost of the microwave oven.

According to the present invention, a door open monitor switch is provided with a circuit board having both edges inserted into two support channels provided in the lock and fixed by a hook formed between the supports, and contact with a push protrusion provided on the circuit board and formed on the door gasket. Tact switch operated on the circuit board and a terminal installed on the circuit board and connected to the microcomputer by connecting to the tact switch, the door open monitor switch is composed of a low-cost tact switch to reduce the cost of the microwave oven The opening and closing can be detected accurately.

Description

Interlock mechanism of microwave oven {INTERLOCK MECHANISM OF A MICROWAVE OVEN}

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 and 3 show 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. Subsequently, the upper and lower hooks 6 and 7 are moved downward by the hook springs 8 to elastically engage the lock 11 to fix the door D. The door open lever (5) hinged to the lock (1) is then rotated downward by the lower hook (7), so that the second interlock switch (4) and the door open monitor switch (door open monitor) By simultaneously contacting the contacts of the switch 9, the second interlock switch 4 and the door open monitor switch 9 are turned on, respectively, and the head 6a of the upper hook 6 contacts the first interlock switch 3. Press to turn on the first interlock switch 3 to supply power to the high voltage portion. In addition, the door open monitor switch 9 detects the closing of the door D.

At this time, the head 7a of the lower hook 7 simultaneously presses the contact point of the interlock monitor switch 2 so that the interlock monitor switch 2 is turned on, so that the first and second interlock switches 3 are turned on. (4) to monitor the normal operation.

However, such a conventional interlock mechanism has a problem of causing a cost increase of the product because the door open monitor switch 9 is composed of a micro switch. That is, since the door open monitor switch 9 merely detects whether the door D is opened or closed, only a minute voltage may be applied. However, the cost of the door open monitor switch 9 may be increased by employing a very expensive micro switch.

The object of the present invention is to provide a microwave interlock mechanism that can reduce the cost of the product by reliably detecting whether the door is opened or closed without configuring the door open monitor switch as a micro switch. To provide.

In order to achieve the above object, the interlock mechanism of the microwave oven according to the present invention includes a lock installed in an electrical cabinet of a cabinet, a door open monitor switch installed on 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 lock to supply or cut off power to the high voltage section according to whether the door is opened or closed, an interlock monitor switch to sense the safe operation of the first and second interlock switches, and an elastic downward downward to the door. In an interlock mechanism of a microwave oven having an upper hook and an interlock monitor switch operating a first interlock switch and a lower hook operating a second interlock switch, the door open monitor switch being biased, It is operated by contact with the circuit board and the pressing protrusion formed on the door gasket and installed in the door gasket. The tact switch (tact switch), and is installed on the circuit board is characterized in that consisting of a terminal (terminal) is connected to the tact switch and connected to the micom (micom).

According to one preferred feature of the present invention, a plurality of supports each having a channel protrudingly formed in the lock and inserted into both edges of the circuit board of the door open monitor switch, and a certain length in the lock It is provided with at least one hook protrudingly formed to elastically support the outer end of the circuit board.

Accordingly, the present invention, since it is possible to accurately detect whether the door is opened or closed without configuring the door open monitor switch as a micro switch as in the prior art, it has an effect on the cost reduction of the microwave oven.

1 is a perspective view of a typical microwave oven,

2 is a side view showing a conventional interlock mechanism;

3 is an excerpted side view taken along III of FIG. 2,

4 is an exploded perspective view showing the interlock mechanism according to the present invention,

Figure 5 is a side view of the coupling state.

* Explanation of symbols for main parts of the drawings

D: door G: gasket

R: Pushpin (of gasket) P: Front of (cabinet)

S: guide slot

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

11: lock

12: door open monitor switch

13: circuit board (of door open monitor switch)

14: Tact switch (of door open monitor switch)

15: terminal (of door open monitor switch)

16: (locked) support 16a: (supported) channel

17: (lock) hooks 18, 19: first and second interlock switches

22, 23: upper and lower hooks

25: interlock monitor switch

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 on the rear surface of the front plate P such that the interlock mechanism of the microwave oven is located in the electrical cabinet of the cabinet C. Detecting whether the door (D) that opens and closes the cooking chamber (K) between the predetermined position of the lock 11, for example, between the upper locking hole (H1) and the lower locking hole (H2) of the front plate (P). The door open monitor switch 12 is installed.

The door open monitor switch 12 only needs to detect whether the door D is opened or closed, and according to a feature of the present invention, a tact switch 14 operated by a low voltage current on one side of the circuit board 13 may be used. The contact point 14a is provided to face the door D side, and the other side is composed of a terminal 15 connected to the tact switch 14 and connected to a microcomputer (not shown) of the microwave oven. In addition, the gasket (G) of the door (D) is formed by pressing a protrusion (R) for pressing a contact (14a) of the tact switch 14 to operate at a predetermined length, the front plate (P) of the cabinet (C) In the gasket G, a guide slot S, through which the pusher R of the gasket G passes, is formed at a position corresponding to the contact 14a of the tact switch 14.

Accordingly, the lock 11 is a means for installing the door open monitor switch 12. For example, two supports 16 each having channels 16a into which both edge portions of the circuit board 13 are inserted are fixed. It is formed to protrude at intervals, and between the supports 16, a hook 17 for elastically hanging and fixing the outer end of the circuit board 13 of the door open monitor switch 12 is formed to protrude. At this time, one side of the circuit board 13 preferably has a cover 13a for guiding the push protrusion R of the gasket G so as to accurately press the contact 14a of the tact switch 14. 14 is formed to protrude to surround the.

On the other hand, 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 18 and 19 for supplying or blocking the first and second interlock switches 18 and 19 are respectively provided so that their contacts (not shown) face upwards, and the first and second interlock switches 18 and 19 are disposed at positions opposite to the lower locking holes H2. An interlock monitor switch 25, which monitors whether the second interlock switches 18 and 19 operate normally, is installed so that its contact faces the front side. Since the first and second interlock switches 18 and 19 and the interlock monitor switch 25 turn on / off power to the high voltage part according to whether the door D is open, It is preferred to be configured.

In addition, the lock 11 between the interlock monitor switch 25 and the second interlock switch 19 has a substantially L-shape for operating the second interlock switch 19 in cooperation with the lower hook H2 of the door D. The door open lever 20 is rotatably supported.

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 at the same time interlocking with the interlock monitor switch 25. The upper and lower hooks 22 and 23 for manipulating the first and second interlock switches 18 and 19 are connected by the hook levers 21 so as to be movable in the vertical direction. The upper and lower hooks 22 and 23 are elastically biased downward by the hook springs 24.

The interlock mechanism of the present invention configured as described above moves the upper and lower hooks 22 and 23 upwards by contact with the corresponding locking holes H1 and H2 of the front plate P when the door D is closed. It is fitted in each locking hole (H1) (H2). Then, the push protrusion R formed on the door gasket G contacts and contacts the contact 14a of the tact switch 14, which is the door open monitor switch 12, thereby pressing the door open monitor switch 12. It is turned on to detect the closing of the door (D).

Next, the upper and lower hooks 22 and 23 are moved downward by the restoring elasticity of the hook spring 24, so that the head 22a of the upper hook 22 presses the contacts of the first interlock switch 18. At the same time, the head 23a of the lower hook 23 is pressed against one end of the door open lever 20. Then, the door open lever 20 rotates the hinge downward to the axis to press the contact point of the second interlock switch 19 to turn on at the same time. Accordingly, the first and second interlock switches 18 and 19 supply power to the high voltage section. At this time, the interlock monitor switch 25 operated by the lower hook 23 monitors the operations of the first and second interlock switches 18 and 19 to operate when the door D is opened. The circuit is configured to stop the operation of the microwave oven by opening a fuse.

On the other hand, when the door D is opened, the locking of the upper and lower hooks 22 and 23 is released, and the switches D, 18, 19 and 25 are released from the locking holes H1 and H2 of the front plate P. ) Is turned off (OFF) to detect the opening of the door (D) and at the same time cut off the power supply to the high-pressure section.

As described above, according to the present invention, since the door open monitor switch is composed of a tact switch which is a lower price than the conventional micro switch, it is possible to accurately detect whether the door is opened or closed while significantly reducing the cost of the product. do.

Claims (1)

A lock to be installed in the electrical cabinet of the cabinet, a door open monitor switch installed on the lock to detect whether the door to open or close the cooking chamber is opened; A first and second interlock switch, an interlock monitor switch for detecting a safe operation of the first and second interlock switches, and an elastic biased downwardly installed on the door to lock the door and to operate the first interlock switch In the microwave interlock mechanism having an upper hook and a lower hook for operating the interlock monitor switch and the second interlock switch, The door (D) has a protruding push protrusion (R), and the door open monitor switch (12) is installed on the circuit board (13) and the circuit board (13) in contact with the push protrusion (R). The tact switch 14 to be activated and the push protrusion R protrude and are formed to surround the tact switch 14 so as to accurately press the contact point 14a of the tact switch 14. Cover 13a for guiding), the circuit board 13 and the terminal 15 is connected to the tact switch 14 and is connected to the microcomputer, the lock 11 is formed to protrude to a predetermined length And a plurality of supports 16 each having a channel 16a into which both edge portions of the circuit board 13 of the door open monitor switch 12 are inserted, and protruded to a predetermined length between the supports 16. At least one that elastically hangs and supports the outer end of the circuit board 13 Interlock mechanisms of the microwave oven comprising: a (17).