JPS634086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a door device for a cooking appliance that ensures the opening and closing operation of a door body.

[Technical background of the invention and its problems]

As heating cookers, microwave ovens that emit high frequency waves using a magnetron to heat and cook food, and microwave ovens equipped with a heater inside the heating chamber are widely used. In these heating cookers, a door body is pivotally supported on the front surface so as to be openable and closable.

In the conventional heating cooker 1, a door body 5 is pivotally supported by shafts 6, 6 so as to be openable and closable so as to cover the opening 3 of the heating chamber 2 and come into contact with the front plate part 4.
A handle 7 is provided on the front surface of the door body, and a handle cover 8 is provided inside the handle 7. Two support arms 9, 9 having holes 9a, 9a formed at their ends, and two protrusions 10, 10 are protruded from the inner surface of the handle 7. The handle cover 8 also has rectangular openings 1 facing the support arms 9, 9 and the protrusions 10, 10, respectively.
1 and 11 and circular through holes 12 and 12 are formed,
The support arms 9, 9 and the protrusions 10, 10 are adapted to fit together. Next, the door body 5 has an opening 1 facing the support arms 9, 9 and the protrusions 10, 10.
3 and 13 are formed, pusher guides 15 and 15 are welded to the handle 7 and slidably support pushers 14 and 14 having hemispherical ends that convert the rotational motion of the handle 7 into linear motion. . Further, a handle hinge 16 and a hook hinge member 17, which rotatably support the handle 7 via the support arms 9, are fixed to the door body 5 by screws 18, respectively. Shafts 19 and 20 protruding from the ends of the handle hinge 16 and the hook hinge member 17 are fitted into the holes 9a and 9a of the support arms 9 and 9 to rotatably support the handle 7. There is. Further, the hook hinge member 17 is integrally formed with hook hinges 21, 21 having shafts 21a, 21a implanted therein.
2 and 22 are rotatably supported. Further, the hook hinge member 17 has the above-mentioned two parts.
A locking portion 24 is integrally formed to lock a hook spring 23 that urges the upper hook 22 downward. A locking portion 25 of a hook spring 23 that biases the lower hook 22 downward is formed integrally with the door body 5.

To explain the operation of the door body 5 configured as described above, grasp the operation part 7a of the handle 7 and
As shown in the figure, when rotated in the direction of arrow a, the protrusion 1
0 presses the pusher 14. The pusher 14 presses the hook 22 against the elasticity of the hook spring 23, the hook 22 rotates around the shaft 21a, the hook 22a at the tip retreats from the locking portion 4a of the front plate 4, and the door body 5 closes. It can be opened and closed freely. Further, when the door body 5 is pressed in the direction a, the door body 5 rotates as shown by arrow A and is opened. By the way, when the handle 7 is rotated as described above, the protrusion 10 moves from the position shown by the solid line to the position shown by the two-dot chain line while maintaining contact with the pusher 14, as shown in FIG. As a result, the initial contact point between the protrusion 10 and the pusher 14 moves from a to b. However, since the contact surface of the protrusion 10 with the pusher 14 is a flat surface, the pusher 14 receives a force in the direction of the arrow B perpendicular to the upper surface of the protrusion 10, which is different from the direction of its linear movement. Therefore, the frictional force between the pusher guide 15 and the pusher 14 increases, and a large force is required to operate the handle 7. In addition, this force in the B direction acts on the pusher 14 using point C as a fulcrum, deforming and wearing out the pusher 14, resulting in a drawback that handle operation becomes uncertain during interlocking motion. Pusher receiving part 22b of pusher 14 and hook 22
The same applies to the relationship with That is, the sixth
As shown in the figure, when the hook 22 rotates from the position shown by the solid line to the position shown by the two-dot chain line, the initial contact point d moves to e while receiving contact friction, so the pusher 14 receives a force in the direction C. It had the drawbacks of deformation and wear.

[Object of the Invention] The present invention aims to provide a door device for a heating cooker that prevents deformation and wear of the pusher that converts the rotational motion of the handle into linear motion.

[Summary of the invention]

This invention forms hemispherical surfaces at both ends of a pusher that moves linearly as the handle rotates, and forms an arcuate surface with a larger diameter than the pusher on a member that interlocks with the pusher so that no lateral pressure is applied to the pusher when the handle rotates. It is composed of

[Embodiments of the invention]

Hereinafter, this invention will be described in FIGS. 7 and 8, in which the same components in FIGS.
This will be explained based on the diagram. In the figure, reference numeral 14 denotes a pusher, and both ends of this pusher 14 are formed into semicircular spheres, one end being in contact with the protrusion 10 of the handle 7, and the other end being in contact with the pusher receiving part 22b of the hook 22. It's summery. A pusher 1 is provided on the upper surface of the protrusion 10 and the pusher receiving portion 22b.
Arc portions 10a and 22c having a larger diameter than the semicircular sphere of No. 4 are formed.

When the handle 7 is rotated in the door body 5 configured as described above, the protrusion 10 moves from the position shown by the solid line to the position shown by the two-dot chain line while maintaining contact with the pusher 14, as shown in FIG. The contact point is a
Move from to b. At this time, the contact point is pusher 1
Since it is located on the linear motion plane of 4, the pusher 14
Pusher 1 due to the direction of linear movement and handle 7
The direction A of the force acting on 4 is the same direction. Therefore, unnecessary frictional force does not act between the pusher guide 15 and the pusher 14, making it easier to operate the handle. Further, since the pusher 14 receives only interlocking force in the linear direction, it is not subjected to shearing force or deformed. It also reduces wear and prevents wobbling even after long periods of use. The same applies to the relationship between the pusher 14 and the pusher receiving portion 22b. That is, hook 22
When the pusher receiving part 22b moves to the position shown by the chain line, it moves from contact point c to d, but contact point d
is located on the plane of linear motion of the pusher 14, and the pusher 14 receives only the interlocking force in the linear direction. Further, since the hook 22 is provided with a hook spring 23, the pusher 14 receives a force in the same direction as the direction of linear movement.

〔Effect of the invention〕

As explained above, in this invention, an arcuate portion having a diameter larger than the semicircular sphere at the end of the pusher is formed on the interlocking surface of either the handle or the hook that comes into contact with the pusher. The direction of the interlocking force can almost always match the direction of the interlocking force, making it easier to operate the steering wheel. Also,
Since wear and deformation of the pusher and pusher guide are prevented, reliable operation is ensured over a long period of time, and radio wave leakage is prevented.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a general heating cooker;
The figure is an exploded perspective view showing the door body of a conventional heating cooker.
Figure 3 is a cross-sectional side view showing the main parts of the door body, Figure 4 is a vertical side view showing the main parts of the door body, and Figure 5 is a cross-sectional side view showing the main parts of the door body.
6 and 6 are side views showing the main parts of the components that convert the rotation of the door body into linear motion, and FIGS. 7 and 8 show an embodiment of the present invention, and FIG. 7 shows the handle. FIG. 8 is a side view showing the direction of the interlocking force as the relative position between the pusher and the hook changes, and FIG. 8 is a side view showing the direction of the interlocking force as the relative position between the pusher and the hook changes. DESCRIPTION OF SYMBOLS 1... Heating cooker, 4... Front plate part, 5... Door body, 7... Handle, 10a... Arc part, 14,
14... Pusher, 15, 15... Pusher guide, 22c... Arc portion, 23, 23... Hook spring.

Claims (1)

[Claims] 1. A handle rotatably supported on the front surface of a door that covers the area around the front plate of the heating cooker and is pivotally supported to open and close freely, and linear movement guided by a plurality of pusher guides provided on the front of the door. A pusher whose end portion is formed into a hemispherical shape is rotatably supported by a hook hinge member fixed to the door body, and a hook portion formed at the tip rotates in conjunction with the linear movement of the pusher. A hook that engages and disengages from the front plate of the heating cooker;
The hook consists of a hook spring that urges the hook of the hook to always be locked to the front plate of the cooking device, and the door body is locked or unlocked from the cooking device, and the hook comes into contact with the pusher. A door device for a heating cooker, characterized in that an arcuate portion having a diameter larger than the semicircular sphere at the end of the pusher is formed on the interlocking surface of either the handle or the hook.