JPS5846321Y2 - microwave door lock - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a microwave oven door lock for locking the microwave oven door to the main body.

Generally, in a microwave oven, the magnetron oscillates after the door is completely closed, but the structure is complicated and expensive, or the magnetron oscillates even when the door is not completely closed. This caused safety problems due to malfunctions.

In view of these points, it is an object of the present invention to provide a door-side lock for a microwave oven that has a simple structure and does not cause malfunction.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, a door 1 is in contact with and separated from a main body side casing 2 of the microwave oven, and a handle 3 that rotates around an axis 3a is provided on the front surface of the door 1. hook 5 via connecting rod 4 that slides left and right
This causes the hook 5 to rotate up and down about the shaft 6.

The left end 5a of the hook 5 in the figure abuts the connecting rod 4, and the hook 5 is urged by a spring 7 in a direction such that a throat 5b provided at its right end descends.

On the other hand, an opening 2a is provided at a position corresponding to the throat 5b of the hook of the main body casing 2, and a locking plate 8 to which the throat 5b is hooked is fixed to the lower back side of the opening 2a. There is.

Further, a cover 10 is attached to the casing 2, which defines a space 9 into which the hook throat 5b is inserted on the back side of the opening 2a, and a gap 11 formed between the lock plate 8 and the lower end of the cover 10. The throat portion 5b protrudes from the.

Below the gap 11 is an L-shaped lock switch support plate 13 that supports a microswitch 12 (lock switch) that starts and stops oscillation of the magnetron.
A biased portion 13a of the hook faces, and a regulation plate 14 is formed on this biased portion 13a to be in contact with the throat portion 5b of the hook.

The actuator 12a of the microswitch 12 extends along the side 14a of the regulation plate 14, and its tip enters below the regulation plate 14, so that the actuator 12a does not come out above the regulation plate 14. It looks like this.

The right end portion 13b of the support plate 13 forms a hinge with the fixed plate 15, both members are connected by a shaft 16, and a spring 17 is fitted onto the shaft 16.

The fixed plate 15 is rotatably supported by a shaft 50, and the support plate 13 is biased clockwise by a tension spring 51, so that the regulation plate 14 is brought into contact with the lower end of the cover 10.

Further, a locking piece 18 is formed at the lower end of the short piece 13C along the casing 2 of the support plate 15, and the locking piece 18 is connected to the arcuate surface 20a of the pressing piece 20 forming a part of the cooking switch 19.
The pressing piece 20 and the knob 21 are attached to both ends of the shaft 22 so as to sandwich the casing 2.
A coil spring 23 is attached on the shaft 22 between the knob 21 and the knob 21.

Next, the effect will be explained.

In FIG. 2, when the door 1 approaches the casing 2, the throat 5b of the hook 5 is lifted upward and inserted into the space 9 while stretching the spring 7 along the curved surface 8a of the locking plate 8.

When the throat portion 5b of the hook passes over the tip of the lock plate 8, the throat portion 5b falls into the gap 11 by the action of the spring 7, contacts the regulating plate 14, and pulls the support plate 13 around the shaft 50. Rotate the spring 51 counterclockwise while stretching it.

This state is shown in FIGS. 3 and 4.

When the cooking switch 19 is pressed inward with a finger in the state shown in FIGS. 3 and 4, the locking piece 18 is pressed by the arcuate surface 20a of the pressing piece 20, so that the support plate 13 is rotated clockwise as shown in FIG. Rotate to.

Therefore, the throat portion 5b of the hook is detached from the regulation plate 14 and transferred onto the actuator 12a, and the throat portion 5b is removed from the support plate 13.
is returned to its original position by the action of the tension spring 51.

Therefore, the microswitch 12 is turned on.

Note that the force F1 for lowering the throat portion 5b of the hook is generated by the tension spring 5.
1 is larger than the force F2 that pulls up the support plate 13 clockwise, and the above F2 is the resistance force F3 of the actuator 12a.
is larger than

Conversely, when opening the door 1, the operator hooks his finger onto the bundle 3 and rotates the bundle 3 counterclockwise, as shown in FIG.

Then, the connecting rod 4 slides to the right in the drawing, the throat 5b of the hook 5 is lifted upward, and the hook between the lock plate 8 and the throat 5b is released.

Therefore, the door 1 can be opened. If the support plate 13 is made rotatable in this way, the hook 5 is completely locked in one action, so reliable operation can be obtained, and the hook 5 does not move when the cooking switch 19 is pressed, so the door 1
Since neither the bundle nor the bundle 3 moves, there is an effect that reliable closing is possible.

Since the present invention is constructed as described above, the structure is simple and the door can be opened and closed reliably without malfunction.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the lock portion of the microwave oven, FIG. 2 is a longitudinal cross-sectional view of the same portion, and FIGS. 3, 4, and 5 are illustrations of operating states. 1...Door, 2...Casing, 3...
...Bundle, 5...Hook, 8...
...Lock plate, 12...Micro switch, 1
3...Support plate, 14...Regulation plate, 19
......Cooking switch, 50...Shaft, 51
...Tension spring.

Claims (1)

[Scope of utility model registration request] A hook attached to the microwave oven door that rotates when the handle is operated, a lock plate attached to the microwave oven body to which the hook is hooked when the door is closed, and a lock that starts and stops cooking. a lock switch support member that supports the switch and is reversibly rotated in the same direction as the rotation direction of the hook and in a direction perpendicular to the rotation direction when the hook and the cooking switch are operated; When the door is closed and the hook is hooked to the lock plate, a regulating plate is formed that comes into contact with the throat of the hook, and when the door is closed, the tip of the hook comes into contact with the regulating plate and locks the lock switch. When the support member is rotated in the same direction as the hook rotation direction, the hook is hooked to the lock plate at the same time, and then when the operator operates the cooking switch, the lock switch support member is rotated in the direction perpendicular to the hook rotation direction. A door-side lock of a microwave oven, which is characterized in that the throat of the hook is rotated to disengage from the regulating plate, and an actuator of a lock switch is pressed.