JPS5824587B2 - 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 hook-shaped engagement portion on the tip side
, 4 are rotatably provided.

An operation panel 8 is provided on the front right side of the main body 1 and includes a timer 5, a cooking button 6, a door opening button 7, etc.
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, 12, and both latch heads 3, 4 are interlocked by a connecting lever 13.

Reference 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 vertically movable.

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 front surface of the front plate 22 of the opening 9 and stands vertically from the support plate 23, and above and below the support plate 23, there are first and second switch mounting plates 24, 2
5, whose first and second openings 19, 20
First and second latch hooks 26, 27 near each
are integrally formed.

The latch hooks 26 and 27 engage the hook portions 30a and 40a of the latch heads 3 and 4, respectively, when the door is in the closed position, thereby providing a mechanism for 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 second switch mounting plate 25 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 built into the locking mechanism of the door so as to operate in conjunction with the latch heads 3 and 4, and among them, the monitor switch 29 is operated in conjunction with the latch heads 3 and 4.
L-shaped switch lever 31 that rotates when pushed by the tip of
Opening/closing is controlled by

Incidentally, an open 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 in the closed position on the main body 1 side by the engagement relationship between the head 3 and the latch hook 26, and the second latch head 4 and the latch hook 27, respectively.

At this time, the actuators of the first and second safety switches 28 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 will be 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.
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 always acts to push the slide lever 34 forward, thereby opening the door opening button 7 fixed at the tip. It 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 retreated, and the slide lever 34 is integrally formed therewith. The protrusion 340 is the open lever 3
2 and rotate the open lever 32 counterclockwise.

This rotation causes the protrusion 170 to move toward the front plate 22 of the opening 9.
The third opening 21 of the rotary lever 1
7 clockwise (Fig. 3).

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

As described above, when the latch heads 3, 4 and the latch hooks 26, 27 are released from each other as the door opening button 7 is pressed, that is, the door 2 is unlocked from the main body 1,
The spring 16 acts to pull back the connecting lever 13 upward and return the latch head 3 to the initial state, and furthermore, due to its elastic force, the tip edges of the latch heads 3 and 4 adjust to the inclinations of the latch hooks 26 and 27, respectively. Surface 260.27
Hit 0.

Therefore, the door 2 is pushed out in the opening direction by the reaction.

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.

FIG. 5 shows an electric circuit of the high-frequency heating device shown in FIG. 1 incorporating these switches, and according to this, the first
, the second safety switches 28 and 30 are connected between the power supply 37 and the microwave oscillation circuit 38, while the monitor switch 29 is in parallel with 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 point when the door is closed, but is switched to the b contact point when the door is opened.Therefore, when the door is opened, the open lamp 40 lights up and illuminates the inside of the open door 9.

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.

Similarly, when the door is opened during cooking, the first and second safety switches 2B and 30 and the monitor switch 30 are linked to the door lock mechanism, so the timer switch 5
0 is closed, the power supply to the microwave oscillation circuit 38 is cut off.

FIG. 6 is an enlarged side view of the latch heads 3, 4 and the connecting lever 13, which are the most characteristic parts of the present invention.

According to this, the latch heads 3 and 4 are connected to the pin 1 as described above.
The hook portions 30a and 40a are formed at the dimension positions L from 1 and 12, respectively, but the dimensions 11 and 12 of the sides 30' and 40' that abut and engage with the latch hooks 26 and 27 are designed to be 11= 5.5 mm12=6.5 ynm, and the latch head 4 is formed longer.

This difference in shape (dimensions) of the latch heads 3 and 4 produces the following effects.

As explained in FIGS. 3 and 4, when the door opening button 7 is depressed to open the door 2, the open lever 32 is rotated counterclockwise, pushing the protrusion 170 and retracting the latch head 3, 4. However, due to a design error, the latch head 4 is first disengaged from the corresponding latch hook 27, and as shown in FIG. There is a time lag in the disengagement operation in which the door 2 remains engaged, and in the worst case, the door 2 is opened in a distorted state due to the pressing force of the open lever 32 without being completely unlocked as shown in FIG. There will be situations where you won't get it.

Therefore, as shown in FIG. 6, the difference in dimensions is improved so that the engagement between the latch head 3 farther from the open lever 32 and the latch hook 26 is released first.

Such a difference in size causes the latch head 3 to be disengaged first or simultaneously, and then the other latch head 4 to be disengaged immediately or simultaneously.

In this case, even if the disengagement on the latch head 4 side is delayed, distortion will not be induced because the point of action of the pressing force of the open lever 32 that causes the door 2 to distort is close to the latch head 4.

As explained above, the present invention can provide a complete door hanging device that is extremely easy to use and has excellent operability by providing an operating body for unlocking the door on the main body side. The length of the side where the tip of the second latch head abuts and engages the latch hook is slightly longer than the length of the side where the tip of the first latch head abuts and engages the latch hook. As a result, the first latch head, which is installed at a position farther from the operating body, is released first, so even if the release of the second latch head is delayed, the pressing force of the operating body that causes the door to warp is reduced. Since the point of application of is close to the second latch head, no distortion is induced.

Therefore, since the door can be opened stably without incomplete unlocking, when a door latch such as a high-frequency heating device is used as a locking device, it is possible to reliably cut off the power supply to the load before the door is opened. It is extremely safe.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a high-frequency heating device equipped with a door hook device of the present invention. FIG. 2 is a vertical sectional view of the main part showing the door lock mechanism of the door lock device. FIG. 3 is a vertical cross-sectional view of the main part showing the door locking mechanism of the door latch 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 of the door latch device, viewed from above. FIG. 5 is an electric circuit diagram assembled in the high frequency heating device. Figure 6 is an enlarged side view of the main parts of the door hook device. FIG. 7 is a vertical sectional view of the main part showing the state of the door latch device when the door is opened with distortion. 1: High frequency heating device body, 2: Door, 3, 4: Latch head, 30a, 40a: Hook portion of latch head, 7: Door opening button, 8: Operation panel, 9: Oven, 16: Spring, 17: Rotating lever, 22: Oven front plate,
26, 27: latch hook, 28, 30: safety switch, 32: oven lever, 34 varnish slide lever.

Claims (1)

[Scope of Claims] 1. A connecting lever is rotatably supported by pins at the upper and lower parts of the door, which is rotatably supported on the main body and is always urged upwardly by a spring and is installed inside the door so as to be movable up and down. first and second latch heads having hook-shaped tips that engage and lock the latch hook on the main body side when the door is in the closed position; a rotating lever that engages with a protrusion on the latch head;
an operating body for operating the rotary lever, which releases the door lock by disengaging the latch hook from the first and second latch heads when the door is in the closed position;
. A door latch device, characterized in that the hook-shaped tip portions formed on each of the second latch heads have different lengths on the side that abuts the latch hook. 2. The door latch used in the high-frequency heating device is a metal device, and the upper and lower parts of the connecting lever are always biased upwardly by a spring and installed inside the door, which is rotatably supported on the main body and can be moved up and down. first and second latch heads each having a hook-shaped tip that are rotatably supported by pins and engage and lock the latch hook on the main body side when the door is in the closed position; It is freely supported and one end is connected to the second
The rotation lever is engaged with a protrusion of the latch head, and the latch hook is disengaged from the first and second latch heads when the door is in the closed position, thereby releasing the door lock. an operating body for operating a moving lever;
The hook-shaped tips formed on each of the second latch heads are formed to have different lengths on the side that abuts the latch hook, and when the door lock is released, the safety switch is opened and a high frequency signal is activated prior to opening the door. The door hanger is a device that cuts off the oscillations.