JPS5852406Y2 - microwave cooking oven door latch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a door latch device for a microwave cooking oven.

In a microwave cooking oven, the oven body,
It is necessary to prevent leakage of radio waves between the door and the door, and in the past, there was no door latch device that completely prevented leakage of radio waves, and many of them caused leakage of radio waves, especially when used for a long period of time.

A conventional door latch device will be explained based on drawings, and its shortcomings will be clarified.

In FIG. 1, a door 51 is attached to an oven main body 50 so as to be openable and closable, and a bundle 52 is attached to the door 51.

A latch head 54 having a hook portion 54' at the tip is fixed to the door 51 at two locations, upper and lower, so that the latch head 54 can be removably engaged with a hook 55 fixed to the oven body 50.

A switch 56 is provided adjacent to the hook 55, which is switched by the hook portion 54' during the engagement.

In the door latch device described above, when opening the door 51, the button 53 is pressed to unlock the latch head 54 and the bundle 52 is pulled.

However, in such a configuration, the force of pulling the door 51 causes wear on the joint between the latch head 54 and the hook 55, and the oven body 50 and the door 51 become damaged after long-term use.
Radio wave leakage will occur between the two.

Next, in FIG. 2, the door 51 is attached to the oven body 50 so as to be openable and closable, and the latch head 54 is attached to the hook 55.
This is the same as in FIG. 1 in that it is removably engaged with.

In this example, the latch head 54 is always pressed and locked by the force F due to the spring 57 attached to the plate 58, which is fixed to the oven body 50.

However, the force F of this spring 57 has a horizontal component H, and this force always acts in the direction of separating the door 51 from the oven main body 50. Therefore, due to long-term use, radio waves may leak from between the oven main body 50 and the door 51. The first thing that will result in
It is similar to the one shown in the figure.

The present invention aims to provide a door latch device that eliminates the above-mentioned drawbacks.

In FIG. 3, the door latching device of the present invention is shown with the door 51 and oven body 50 open.

That is, the door 51 is provided with a latch head 54 having a hook portion 54' at two locations, upper and lower, so as to be swingable on the pin 3 of the pivot base.

Further, the lower end of the hook portion 54' is formed into an inclined surface 59 that descends to the right with respect to the arm portion of the latch head 54.

The other ends of the two latch heads 54 are rotatably attached to the connecting plate 4 by pins 2, and a spring 1 is attached to the upper end of the connecting plate 4, so that the connecting plate 4 is constantly lifted upward. There is.

On the other hand, a mounting plate 6 is fixed to the open body 50 at a position corresponding to the latch head 54.

A hook 55 and a switch 56 are fixed to the upper mounting plate 6 .

A lever 8 is attached to the lower mounting plate 6 so as to be rotatable about a shaft 9 along with a hook 55 and a switch 56 .

At the other end of the lever 8 is a connecting rod 1 which is rotatably mounted on a pin 10.
1 is attached, and a protrusion 7 is attached above the end.
is provided and is in contact with the inclined surface 59 of the latch head 54.

One end of an open lever 12 is connected to the other end of the connecting rod 11.
It is rotatably mounted at pin 14.

The open lever 12 is rotatably attached to the oven body 50 on a shaft 13, and one end thereof protrudes below the operation panel 15.

Referring next to FIG. 4, the lower latch head 54 is shown with the door latching device shown in FIG. 3 in a latched condition.

That is, the oven main body 50 and the door 51 are in close contact.

In this state, the hook portion 54' of the latch head 54 rotatably attached to the door 51 is moved by the spring 1 (not shown in this figure) attached to the upper end of the connecting plate 4, so that the hook portion 54' of the latch head 54 is attached to the oven main body 50. It is engaged with a hook 56 attached to.

Further, the lever 8 is pressed down in contact with the lower end of the hook portion 54', and the switch 56 is actuated.

In this state, the open lever 12 shown in FIG.
The state of force when pushing down the connecting rod 11 and attempting to lift the connecting rod 11 is as follows.

That is, the protrusion 7 on the top surface of the tip of the lever 8 applies a force F perpendicularly to the inclined surface 59 at the lower end of the hook of the latch head 54.

(arrow 7 in the figure) This force F (Figure 4) is inclined to the right and directed upward.

(arrow 7 in the figure) The reason for this is that, as described above, the inclined surface 59 is configured to descend to the right with respect to the arm portion of the latch head 54.

Therefore, the force F includes not only the vertical component V but also the horizontal component H directed to the right (FIG. 4).

That is, this horizontal component force H acts in a direction that brings the door 51 into close contact with the oven body 50.

In this state, the lever 8 is lifted to a certain extent and the switch 56 is
The switching protrusion 56' protrudes and remains there until the switch 56 is switched.

Furthermore, the state in which the lever 8 is lifted will be explained based on FIG. 5.

That is, the inclined surface 59 of the latch head 54, which is in contact with the protrusion 7 on the upper tip of the lever 8, is inclined upwardly to the right (FIG. 5).

As a result, the force F transmitted from the open lever 12 through the connecting rod 11 and the projection 7 of the lever 8 is perpendicular to the inclined surface 59 of the latch head 54, as in the case of FIG. Figure F\) It slopes to the left and faces upward.

Therefore, the component of this force F is the vertical component V (↑V in Figure 5).
) and the horizontal component H, but the horizontal component H is (the fifth
The latch head 54 is used as a force to separate the door 51 from the oven main body 50.
can be conveyed to.

That is, the switching protrusion 56' of the switch 56 protrudes,
After the lever 8 has been lifted enough to switch the switch 56, the force acting on the door 51 from the door latching device will be switched in the direction of moving the door 51 away from the oven body 50.

Next, another embodiment of the present invention is shown in FIG.

This is a structure in which the connecting plate 4 shown in FIG. 3 is further extended and an open head 17 that can swing around a shaft 19 is rotatably attached to the pin 1. Although not shown, the open lever 12 shown in FIG. A lever 8 that rotates in conjunction with the operation contacts the tip of the open head 17 and rotates it counterclockwise, thereby releasing the latch head 4 from the latch hook 55 via the connecting plate 4. be.

The present invention has the following effects in the above configuration and operation.

a hook 55 fixed to the oven main body 50; a hook rotatably attached to the door; the hook 1 has an inclined surface 59 that is removably engaged with the hook 55 at its tip and descends toward the main body 50; a latch head 54 having a latch hook 55; a spring 1 provided on the door for biasing the latch head 54 to engage the latch hook 55;
A switch 56 which is switched via a switching protrusion 56' when the latch head 54 is engaged with the latch head 54 is brought into contact with an inclined surface 59 of the hook portion of the latch head 54, and one end of the switch 56 is rotatably attached to the oven main body 50. The latch head is pressed against the lever 8, and until the lever protrudes the switching protrusion of the switch and switches the switch, the retaining portion between the lever and the latch head is pressed so as to generate a force that pulls the latch head toward the oven body. Since the door latch device is configured, there is no need to worry about radio wave leakage caused by a gap between the oven body and the door even after many years of use.

[Brief Description of the Drawings] Fig. 1 is a conceptual diagram of a conventional door latch device, Fig. 2 is a conceptual diagram of the same as above, and Fig. 3 is a front view of the door latch device of the present invention.
4 is a diagram of the door latching device shown in FIG. 3 in a latched state, FIG. 5 is a diagram of the door latching device shown in FIG. 3 in a released state, and FIG. 6 is a front view of another door latching device of the present invention. figure. 1... Spring, 2... Pin, 3...
...Axis 4...Connecting plate, 6...Mounting plate,
7...Protrusion, 8...Lever, 9...
...Shaft, 10...Pin, 11...Connecting rod, 12...Open lever, 13...
...Axis, 14...Pin, 15...Operation panel, 17...Open head, 18...
... Pin, 19 ... Shaft, 50 ... Oven body, 51 ... Door, 52 ...
Bundle, 53... Button, 54...
Latch head, 54'... Hook part, 55...
...Hook, 56...Switch, 57...
・・・Spring, 58...Spring installation is plate, 59...
...Slope view.

Claims (1)

[Scope of utility model registration request] It has a hook 55 fixed to the oven main body 50, and a hook portion rotatably attached to the door and having an inclined surface 59 at the tip that is removably engaged with the hook 55 and descends toward the main body 50 side. a latch head 54, which is provided on the door and urges the latch head 54 to engage with the latch hook 55; A door latch device for a microwave cooking oven, characterized in that an inclined surface 59 of a hook portion of 54 forcibly contacts a protrusion 7 of a lever 8 that drives a switch 56.