JPS5821074B2 - door latch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a door latch device which is convenient for use in, for example, a high frequency heating device.

In general, in high-frequency heating equipment, a door latch device that has a locking mechanism that locks a door rotatably supported on the main body to the main body in the closed position has an operation to release the lock on the door itself. Means are provided at or near the door bundle for grasping the door bundle to open the door after unlocking.

However, recently, high-frequency heating devices have been put on the market that have an operating means for opening the door on the main body side, which allows the door to be unlocked without having to touch the door each time, and to automatically push the door in the opening direction. ing.

The present invention provides a novel door latch device for devices such as high-frequency heating devices, which is provided with an operating body for unlocking the door on the main body side.

FIG. 1 is an external perspective view of a high-frequency heating device equipped with a door latch device of the present invention, in which a door 2 is rotatably supported on a main body 1 and protrudes from the door 2 at the right end of the door frame. First and second latch heads 3 each having a retaining portion in the shape of a .
, 4 are rotatably provided.

The front right part of the main body 1 includes an operation panel 8 on which a timer 5, a cooking button 6, a door opening button 1, etc. are arranged.
When the cooking button 6 is closed and the cooking button 6 is manually operated, heating cooking is performed for the time set in the timer 5.

FIG. 2 is a longitudinal sectional view showing an embodiment of the door latch device of the present invention installed in the high-frequency heating device of FIG. , 4 are rotatably supported by pins 11 and 12, and both latch heads 3 and 4 are interlocked by a connecting lever 13.

Numerals 14 and 15 are pins that connect the connecting lever 13 and the latch heads 3 and 4. The connecting lever 13 is always urged upward by a spring 16 and is movable up and down.

Reference numeral 17 denotes a rotating lever rotatably supported on the door 2 by a pin 18, one end of which engages with the protrusion 41 of the second latch head 4, and when rotated clockwise, the second latch head Rotate 4 counterclockwise.

This rotation of the second latch head 4 causes the coupling lever 13 to be lowered, so that the first latch head 3 is also rotated counterclockwise.

The other end of this rotating lever 17 has a door 2 facing toward the main body 1.
A protrusion 170 that protrudes more is integrally formed.

Returning to FIG. 1, on the front plate 22 of the oven 9, the first and second latch heads 3, 4 and the protrusion 170 of the rotary lever 17 are movable toward the main body 1 when the door 2 is opened and closed. Openings 19 and 20° 21 for entry are provided in the vertical direction, respectively.

Returning to FIG. 2 again, a support plate 23 is fixed to the back wall of the front plate 22 of the oven 9 and stands vertically therefrom, and above and below the support plate 23 are first and second switch mounting plates 24 . 2
5, whose first and second openings 19.20
First and second latch hooks 26 and 27 near each
are integrally formed.

The latch hooks 26 and 27 have a mechanism in which the hook portions 30 and 40 of the latch heads 3 and 4 engage with each other when the door is in the closed position, thereby locking the door 2 to the main body 1 side.

Further, the first switch mounting plate 24 is provided with a normally open first safety switch 28 and a normally closed monitor switch 29, and the switch mounting plate 25 of the power cylinder 2 is provided with a first safety switch 28 and a normally closed monitor switch 29. A second safety switch 30 having contacts is provided. These switches are incorporated into the locking mechanism of the door so as to operate in conjunction with the latch heads 3 and 4. Of these, a monitor switch 29 is provided. L-shaped switch lever 3 that rotates when pushed by the tip of the latch head 3
Opening/closing is controlled by 1.

Incidentally, an oven lever 32, which will be described later, is provided near the third opening 21 formed in the front plate 22 of the oven 9.

FIG. 3 is a longitudinal sectional view illustrating the operating state of the door latch shown in FIG. 2 when the door 2 is in the closed position and locked to the main body 1, and the first latch is The door 2 is locked to the main body 1 in its closed position by the engagement relationship between the head 3 and the latch hook 26 and the second launch head 4 and the latch hook 27, respectively.

At this time, the actuators of the first and second safety switches 2B and 30 are pressed by the tips of the latch heads 3 and 4, and are closed.

On the other hand, the monitor switch 29 is opened in advance by the rotary lever 31.

Further, the open lever 32 is connected to the protrusion 17 of the rotating lever 17.
It is pushed back by 0.

Next, door 2 locked on the main body 1 side as described above.
The mechanism for opening is explained.

FIG. 4 is a cross-sectional view of the main parts of the door opening mechanism assembled in the door latch device of the present invention, seen from above, in which the mounting board 33 is fixed behind the operation panel 8 on the main body 1 side. There is a slide lever 34 that can be moved forward and backward.
and the open lever 32 which is rotatable by a pin 35.
and is provided.

Further, the spring 36 is an elastic means that connects the open lever 32 and the slide lever 34, and its elastic force acts to constantly push the slide lever 34 forward, and the door opening button 7 fixed to the tip is made to protrude from the operation panel 8.

Now, according to such a mechanism, when the door 2 is closed, the open lever 32 is in the state shown in the figure, but when the door opening button 7 is pressed in the direction of the arrow, the slide lever 34 is retracted, and the slide lever 34 is moved back. The formed protrusion 340 contacts the open lever 32 and rotates the open lever 32 counterclockwise.

This rotation causes the protrusion 170 to move toward the front plate 22 of the oven 9.
The third opening 21 of the button is moved backward in the direction of removal, and the rotating lever 17 is rotated clockwise (FIG. 3).

Therefore, as described above, the first and second latch heads 3.4 are rotated counterclockwise so as to release their hook portions 30, 40 from the latch hooks 26.degree. 27.

In this way, when the engagement between the latch heads 3 and 4 and the latch hooks 26 and 27 is released due to the pressing operation of the door opening button 1, that is, when the lock on the door 20 body 1 is released,
Spring 16 is a connecting lever; -13 is pulled back upwards,
and acts to return the latch head 3゜4 to its initial state,
Furthermore, due to the elastic force, the tip edges of the latch heads 3 and 4 are bent to the inclined surfaces 260° 2 of the latch hooks 26 and 27, respectively.
70 and acts to push the door 2 in the opening direction.

Therefore, the door 2 is automatically opened from the main body 1 by pressing the door opening button 7.

During the operation period for unlocking the door as described above, the first and second safety switches 28 are opened when the door 2 is in the closed position, and the monitor switch 29 starts to operate to close later. ing.

This is designed to stop microwave oscillation before opening the door, thereby preventing microwaves from leaking through the gap between the door 2 and the main body 1.

Figure 5 shows the electric circuit of the high-frequency heating device shown in Figure 1 incorporating these switches, and according to this, drug distribution 1
, the second safety switch 28,30 is connected between the power source 37 and the microwave oscillation circuit 38, while the monitor switch 29 is connected in parallel to the microwave oscillation circuit 38 and connects the fuse 39 to the first safety switch 28. connected in series.

The second safety switch 30 is at the a contact when the door is closed, but is switched to the b contact when the door is opened, so that the oven lamp 40 is turned on and illuminates the inside of the oven 9 when the door is opened.

Further, the timer 5 provided on the operation panel 8 consists of a timer switch 50 and a timer motor 51.
When the cooking button 6 is operated and the cooking switch 60 is closed, the clock is started.

In synchronization with this, the power source 37 is connected to the microwave oscillation circuit 38, the blower motor 41, and the turntable motor 42, and cooking begins.

In addition, when the door is opened during cooking, the first and second safety switches 28, 30 and monitor switch 30 are linked to the door lock mechanism.

Even when the timer switch 50 is closed, the power supply to the microwave oscillation circuit 38 is cut off.

Next, other embodiments of the present invention will be explained with reference to FIGS. 6 and 7.

First, let us explain the example shown in FIG. 6. This is the door 2.

The latch head 100, 101 is attached to the pin 102゜10 at the end.
3, and both latch heads 100 and 101 are always urged to the state shown in the figure by springs 104 and 105.

As in the example shown in FIG.
go inside.

This open lever 106 allows rotation levers 107,1
08 is rotated at pins 109 and 11Q as shown by the arrow, and the latch heads 100 and 101 are rotated counterclockwise.

Rotate.

Of course, the rotation of the latch head 100° 101 releases the engagement with the latch hook on the side of the main body shown in the figure, in other words, the door 20 main body is unlocked, and the door 2 The force pushes it in the opening direction as in the previous example.

According to the example of FIG.
0 and 121 are rotatably supported by pins 122 and 123, and both are connected by a connecting lever 124.

As in the example shown in FIG. 1, when the door opening button is pressed, the open lever 125 protrudes from the main body side and enters the door 2, and the rotatable connecting lever 124 is rotated by the pin 130. direction.

As a result, the latch heads 120 and 121 connected by the pins 126 and 127 are rotated counterclockwise.

As in the previous example, this rotation unlocks the door 2 from the main body.

As described above, the present invention includes a connecting lever that is vertically installed inside a door that is rotatably supported on a main body, and a first lever that is rotatably supported by the connecting lever. a second latch lever, and when the door is in the closed position, the first latch lever
, a latch hook that engages and matches the second latch lever is provided on the main body, and when the door is opened, the latch lever and the latch hook are engaged by pressing a door opening button provided on the main body. When the latch hook is released, the lever that is separated from the latch hook is forcibly moved to the main body side, and the connecting lever is constantly biased upward. When the first and second latch heads and their respective latch hooks are disengaged from each other as the door opening button is pressed, that is, when the door body is unlocked, the elastic body moves the connecting lever upward. The elastic force causes the tips of the first and second latch heads to strike the respective inclined surfaces of the latch hook, The door acts to push the door in the opening direction and automatically opens away from the main body, so you can move the door to the desired opening position by simply pressing the door opening button lightly without touching the door at all. A door hook, which can be rotated and is therefore extremely user-friendly, can provide the entire device.

1 Therefore, by using the door hook of a cooking device such as a high-frequency heating device as a whole device, the power supply to the load can be cut off before the door is opened, which is useful for preventing microwave leakage. It can be of high utility value.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a high-frequency heating device equipped with all the door hooks of the present invention.

FIG. 2 is a vertical cross-sectional view of the main part of the door lock mechanism of the entire device.

FIG. 3 is a vertical sectional view of the main part showing the door locking mechanism of the door hanging device when the door is locked to the main body.

FIG. 4 is a cross-sectional view of the main parts of the door opening mechanism, viewed from above, showing the door opening mechanism of the entire device.

FIG. 5 is an electric circuit diagram assembled in the high frequency heating device.

FIG. 6 is a vertical sectional view of a main part showing another embodiment of the present invention.

FIG. 7 is a vertical sectional view of a main part showing still another embodiment of the present invention.

1: High frequency heating device body, 2: Door, 3, 4: Latch head, 1: Door opening button, 8: Operation panel, 9: Oven, 16: Spring, 11: Rotating lever, 22: Oven front plate , 26.27: Latch hook, 28,30
: Safety switch, 32: Oven lever, 34 Varnish slide lever.

Claims (1)

[Claims] 1. A door rotatably supported on a main body is provided with a connecting lever installed inside the door so as to be able to move up and down, and first and second latch levers rotatably supported by the connecting lever, Latch hooks that engage the first and second latch levers in the closed position are provided on the main body, respectively, and when the door is opened, the latch levers are engaged with the latch hooks by pressing a door opening button provided on the main body. When the engagement with the latch hook is released, the elastic body forcibly moves the latch lever away from the latch hook toward the main body and the elastic body that constantly biases the connecting lever upward. The door hook is a metal device.