KR20010057190A - Latch device for door of microwave oven - Google Patents

Abstract

PURPOSE: A latch device is provided to operate at least two microswitches by using a latch having a single hook and to eliminate the need of an external pin for the operation of the microswitches. CONSTITUTION: A latch device comprises: a latch board having at least one connecting parts(18) for connecting a door hook(20); a pair of microswitches(Ma,Mb) installed in the upper and lower portions of the connecting parts in the latch board; a first actuating member(12) rotatably supported on a first rotating shaft(12a) in the latch board to operate the upper microswitch; and a second actuating member(14) rotatably supported on a second rotating shaft(14a) in the latch board to operate the lower microswitch by rotating the second rotating shaft via the hook connected to the connecting part. The first and second actuating members are restrained from contacting to the microswitches while the hook is displaced.

Description

Latch device for door of microwave oven

The present invention relates to a latch used in a door of a microwave oven, and more particularly, to a latch device configured to operate three microswitches using one hook.

Since microwaves used as heating sources in microwave ovens have a lethal effect on the human body, it is not good to leak them from the inside of the microwave oven to the outside. When the door is opened in the microwave, the microwaves must be cut off to prevent the microwaves from leaking out.

By stopping the generation of the microwave in this way, it is implemented in the latch device of the door to prevent the microwave from leaking. The latch of a door means the part which catches the main body of a microwave oven so that a door may be kept closed by the main body of a microwave oven. When the door of the microwave oven is opened, the latch of the door releases the engagement state with the main body so that the door can be opened.

When the door of the microwave oven is opened as described above, a plurality of micro switches are installed to cut off the current supplied therein, and at least two micro switches are installed. That is, when one microswitch is installed, there is a risk of malfunction. At least two or more microswitches are provided, and when any one of the microswitches is turned off, the current supplied to the microwave is turned off so that the micros It is configured to prevent fatal damage caused by the wave.

Generally, the door of a microwave oven is provided with the latch provided with a pair of hooks. A fastening hole for fastening the pair of hooks is formed on the front surface of the microwave oven body, and the pair of hooks are fastened through the fastening holes to operate the micro switch.

And when the hook formed in the latch of the door is removed from the main body of the microwave oven, at least one side of the at least two or more microswitch is configured to be cut off the power supplied to the microwave oven.

According to such a conventional configuration, it can be seen that at least one pair of microswitches are provided, which constitute a pair of hooks and each hook is engaged with the microwave oven body. However, according to the conventional structure, the conventional door is provided with a pair of hook members, there is a disadvantage that the configuration of the latch mounted to the door is complicated.

It is an object of the present invention to provide a latch device for a microwave oven, which is configured such that at least two or more microswitches can be operated by a latch having a single hook.

Another object of the present invention is to provide a latch device for a microwave oven, wherein for testing reasons, at least one of the plurality of micro switches is configured not to operate by an external pin.

1 is a front view showing the configuration of a latch device according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ..... Latch Board 12 ..... First operating member

12a ..... 1st rotating shaft 14 ..... 2nd operating member

14a ..... 2nd rotating shaft 16 ..... blocking member

18 ..... Fastening Ma, Mb ..... Micro Switch

S ..... Spring

A latch device for a door of a microwave oven according to the present invention for achieving the above object comprises: a latch board having a fastening part mounted on a main body of a microwave oven and fastening a hook of a door; A pair of micro switches installed in the latch board, the upper and lower parts of the fastening part; A first operating member rotatably supported by a first rotation shaft in the latch board, the first operating member being rotated about the first rotation shaft by a hook fastened to the fastening unit to operate an upper micro switch; And a second operating member rotatably supported by the second rotating shaft inside the latch board, and operated by the hook fastened to the fastening unit about the second rotating shaft to operate a micro switch below. Became; The first operating member and the second operating member are not in contact with the micro switch when the hook is detached.

The first operating member is rotated by its own weight about the first rotating shaft in the detached state of the hook and spaced apart from the microswitch. The second operating member, in the detached state of the hook, moves the second rotating shaft by a spring. Rotate away from center.

Next, the present invention will be described in more detail with reference to the embodiments of the present invention shown in the drawings.

Referring to Figure 1, the latch board 10 according to the present invention is installed inside the front of the microwave oven, the hook 20 of the door is fastened. A plurality of micro switches Ma and Mb is installed inside the latch board 10. That is, one micro switch Ma is installed on the upper side of the latch board 10, and one micro switch Mb is installed on the lower side of the latch board 10. The microswitches Ma and Mb on both sides are operated by hooks mounted to the door, as mentioned in the prior art. In other words, when the door of the microwave oven is opened in the main body, the micro switch is turned off to operate to cut off the current supplied to the entire microwave oven. Therefore, if any one of the plurality of micro-switch is turned off, the entire current supplied to the microwave is cut off, so that microwaves can never be generated.

In addition, although the micro switch Mb installed below the latch board 10 looks like one in the illustrated state, another micro switch may be located on the lower surface side of the micro switch Mb. Therefore, it is also possible to comprise three micro switches operated by the latch apparatus according to the present invention. In addition, the microswitch installed under the lower microswitch Mb is operated by the same member, which will be described later.

On the front of the latch board 10 according to the present invention, the fastening portion 18 to which the hook is fastened is molded while the hook 20 attached to the door enters and exits. Through the fastening part 18, the hook 20 installed on the door is fastened. In the closed state, the hook 20 turns on the micro switches Ma and Mb as described above, and the inside of the microwave oven is turned on. This is the part configured to supply current to the furnace.

In addition, inside the latch board 10, a first operating member 12 and a second operating member 14 operated by the hook 20 are rotatably provided. The first operation member 12 is configured to turn on and off the micro switches Ma and Mb provided at an upper portion thereof, and is rotatably supported around the first rotation shaft 12a. The first operating member 12 pivotably supported by the first rotating shaft 12a rotates downward (counterclockwise) by its own weight in a state in which the hook 20 of the door is not engaged. As a result, the microswitch Ma can be turned off.

The second operation member 14 is configured to be rotatable about the second rotation shaft 14a and is configured to be elastically supported in the counterclockwise direction by the spring S. As shown in FIG.

On the upper side of the second operation member 14, the blocking member 16 is formed integrally with the latch board. The blocking member 16 is configured such that the lower micro switch Mb is not turned on by an external pin. That is, for example, it is necessary to perform a constant test in order to prevent the current from being supplied while the door is open. At this time, an external standard pin P may be inserted through the fastening part 18. In this case, the micro switch Mb of the lower portion is not turned on by the pin P. If at least one switch is not turned on by the pin (P) for the standard, since the current is not supplied to the inside of the microwave oven as a whole, at least one micro switch Mb is formed using the blocking member 16. It can be seen that it is not operated by an external pin.

Next, a single hook 20 is inserted into the fastening part 18 and will be described with respect to an operation occurring inside the latch board 10 while being fastened.

When the door of the microwave oven is closed, the hook 20 installed in the door will be fastened while being inserted through the fastening portion 18 of the latch board 10. This fastening structure is substantially the same as the conventional one.

And when the hook 20 is inserted into the fastening portion 18 of the latch board 10, the insertion end of the hook 20, and one side of the first operating member 12 and the second operating member 14 and Contact. Therefore, the second operation member 12 turns on the upper microswitch Ma while rotating clockwise about the first rotation shaft 1a.

At the same time, one end of the hook 20 is in contact with the second operating member 14, thereby rotating the second operating member 14 in a clockwise direction about the second rotating shaft 14a. As the second operating member 14 rotates in the clockwise direction, the second micro member Mb is turned on. As described above, the microswitch Mb installed below may be configured as a pair. In the case of configuring a pair of microswitches as described above, a pair of microswitches may be provided by the second operation member 14. Will work simultaneously.

In this state, when the hook 20 of the door is fastened to the latch board 10, the micro switches Ma and Mb are both turned on, and the current may be supplied to the inside of the microwave oven. .

In this state, when the door of the microwave oven is opened, the hook 20 is removed from the fastening portion 18. When the hook 20 is separated, the first operating member 12 is rotated counterclockwise about the first rotation shaft 12a. Such rotation of the first operating member 12 is substantially caused by its own weight. That is, by the installation position of the first rotary shaft 12a, the first operating member 12 is moved to its original position while rotating counterclockwise by its own weight, and by this rotation the upper microswitch ( Ma) is off.

In addition, while the first operating member 12 is rotated by its own weight, the second operating member 14 is rotated counterclockwise about the second rotating shaft 14a by the elastic restoring force of the spring S. do. Therefore, the micro switch Mb at the bottom is also turned off by the counterclockwise rotation of the second operation member 14.

In this way, since the door of the microwave oven is opened and the micro switches Ma and Mb are turned off at the same time, the power supplied to the inside of the microwave oven is turned off, and the magnetron becomes impossible to operate. Thus, as with the moment of opening the door, the generation of microwaves is stopped.

In addition, even when the standard pin P is inserted through the fastening portion 18 of the latch board 10 while the door is opened, the pin P is formed by the blocking member 16 formed on the latch board. Contact with the lower microswitch Mb is prevented. Therefore, since at least the lower microswitch Mb cannot be turned on in the open state of the door, the current supplied to the microwave is cut off, and the generation of the microwave can be absolutely prevented.

As described above, according to the present invention, it can be seen that the basic technical idea is to configure at least two or more microswitches Ma and Mb to be simultaneously turned off by one hook 20 installed in the door. There will be.

Within the scope of the basic technical idea according to the present invention, of course, many other modifications are possible to those skilled in the art.

For example, the first operation member 12 described above is configured to rotate by its own weight when the hook 20 is detached, but also configured to operate using a spring in the same manner as the second operation member 14. Of course it is possible.

According to the present invention as described above, it can be seen that at least two or more microswitches are configured to operate simultaneously by using one hook installed in the door of the microwave oven. Therefore, it is expected that the present invention can have a significantly simpler structure as compared to the conventional one, and can also constitute a door latch device for a microwave oven that can sufficiently secure reliability in terms of operation.

Claims (4)

A latch board mounted to the main body of the microwave oven and having one fastening part 18 to which the hook 20 of the door is fastened; In the latch board, a pair of micro switches (Ma, Mb) are installed on the upper and lower portions of the fastening portion (18); The latch switch is rotatably supported by the first rotation shaft 12a in the latch board and rotates about the first rotation shaft 12a by a hook fastened to the fastening portion 18 to operate the upper microswitch. A first operation member 12 to make; And Rotatingly supported by the second rotary shaft 14a in the latch board, and rotated about the second rotary shaft 14a by a hook fastened to the fastening portion 18 to operate a micro switch below. It comprises a second operating member 12 to make; The first operating member (12) and the second operating member (14), the latch device for a door of a microwave oven, characterized in that the contact with the micro switch in the state that the hook (20) is removed. The latch of claim 1, wherein the first operating member 12 is rotated by its own weight about a first rotational axis in a detached state of the hook 20 and spaced apart from the microswitch. Device. The method according to claim 1 or 2, wherein the second operation member 14, characterized in that rotated in the direction of separation about the second axis of rotation by a spring (S) in the detached state of the hook (20). Latch device for a door of a microwave oven. 4. The latch apparatus for a door of a microwave oven according to claim 3, wherein the lower micro switches (Mb) are constituted by a pair installed side by side and driven simultaneously by the second operating member (14).