JPH0125517Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a microwave oven having a turntable, and particularly relates to an improvement of a support roller stand on which the turntable is placed and rotated.

<Prior art> Figure 5 shows a conventional microwave oven.
Turntable (tray) 2a in heating chamber 1a
is a plurality of support rollers 3 pivotally supported on the bottom plate of the heating chamber.
a, and was rotated by a coupling 6a fixed to a motor shaft 5a that fits into an outer recess 4a in the center thereof. Further, an annular convex portion 7a was formed on the lower surface of the tray 2a to prevent the support roller 3a pivotally supported on the bottom plate of the heating chamber (oven) from being seen from the outside.

However, in the case of this configuration, the tray 2a on which the food to be cooked is placed 2 is driven via a surface contact portion with a large friction coefficient between the tray 2a and the coupling 6a, and When the tray 2a is removed, a plurality of support rollers 3a pivotally supported on the oven bottom plate are exposed, resulting in the inconvenience that cleaning the inside of the oven 1a is time consuming. Further, since the tray 2a needs to be fitted with the coupling 6a of the motor shaft 5a, the shape is complicated and precision is required.If the tray 2a is made of a transparent material such as glass, Since the support roller 3a of the bottom plate was visible through the annular convex portion 7a of the tray 2a, there was an inconvenience that the aesthetic appearance was impaired. Therefore, support roller stands as shown in FIGS. 6 to 9 are being adopted.

FIG. 6 shows a microwave oven 1 according to an embodiment of the present invention, and the turntable 4 inside the oven 3 with the door 2 opened is connected to a motor section 5 provided on the oven bottom plate side, as shown in FIG. A connecting portion 9 is connected to the motor shaft 6 projecting upward from the spacer 7 via a spacer 7.
A support roller stand 8 consisting of three arms 10, 10, 10 and three support rollers 11, 11, 11 is fitted.

As shown in FIG. 8, the support roller stand 8 is provided with three arms 10, 10, 10 protruding outward at an interval of 120 degrees from the connecting portion 9 that fits into the spacer 7, and each arm A support roller 11 is rotatably attached to the tip of the roller 10 . The fit between the spacer 7 and the support roller stand 8 is adjusted so that the support roller 11 is in contact with the oven bottom plate, and when the support roller stand 8 is rotated by the motor section 5, each support roller 11 is placed on the oven bottom plate. It's starting to roll. On each support roller 11 of the support roller stand 8, a width larger than the support roller 11 is provided on the bottom plate portion of the tray 4 corresponding to the support roller 11.
A tray 4 having an annular guide groove 12 with a depth of, for example, about 3 m/m is placed.

Next, the operation of the above configuration will be explained. When the food to be cooked is placed on the tray 4 and the motor section 5 is rotated, the rotation of the motor shaft 6 is transmitted to the support roller stand 8 fitted to the motor shaft 6 via the spacer 7 . At this time, the support roller 11 attached to the tip of the arm 10 so as to be in contact with the oven bottom plate is rotated in the direction of the arrow shown in FIG. 9 with respect to the rotation direction P of the arm 10. The tray 4 placed on top receives the rolling force of the support roller 11 and moves around the motor shaft 6 in the annular guide groove 12.
It rotates in a stable state along the same direction as the rotational direction of the arm 10 at twice the speed of the support roller 11.

Therefore, the weight of the tray 4 and the food to be cooked placed thereon is received by the support rollers 11, 11, 11, and the driving torque required for turning the tray 4 is Since the rolling friction coefficient between Also,
Unlike the conventional case, the support roller 11 is not pivotally supported on the oven bottom plate side, so when the tray 4 and the support roller stand 8 are removed, only the spacer 7 remains inside the oven 3, making it easier to clean the inside of the oven 3. . Moreover, since it is not necessary to fit the tray 4 with a coupling ring, the shape of the tray 4 is not only simple and does not require much precision, but also when the tray 4 is made of a transparent material such as glass. Since the support roller 11 is merely rotated together with the arm 10, the aesthetic appearance is not impaired. Moreover, the tray 4 is two parts of the conventional tray 2a.
Since it rotates at twice the speed, the radio waves from the magnetron (not shown) will evenly hit the food, resulting in more even cooking.

However, the fitting portion 13 of the support roller stand 8 that fits onto the motor shaft 6 (via the spacer 7)
As shown in FIGS. 4 to 4, the support roller stand 8, which was removed to clean the inside of the oven 3, is attached to the motor shaft 6 after the cleaning is completed. Table 8
It was inconvenient because I had to pay attention to what was going on behind the scenes.

<Purpose> The present invention was developed in view of the above, and includes fitting parts that fit onto the motor shaft on both the front and back sides of the support roller stand, so that the attachment of the support roller stand to the motor shaft can be done on both the front and back sides.
The purpose is to make it possible to do both.

<Example> Hereinafter, an example of the support roller stand for a microwave oven of the present invention will be described based on the drawings.

Fig. 1 is a top view of the support roller stand of the microwave oven of the present invention, and Fig. 2 is a cross-sectional view taken along the line A-A' in Fig. 1, and the same or equivalent parts as in the conventional example are given the same reference numerals. and the explanation thereof will be omitted.

The difference from the conventional example shown in FIGS. 3 and 4 is that a fitting part 13 that fits onto the motor shaft 6 via a spacer 7 is provided on both the upper and lower surfaces of the connecting part 9, so that the rotation axis is centered. The support roller stand 8 can be attached to the motor shaft 6 either from the front or the back, so the support roller stand 8 that has been removed to clean the inside of the oven 3 can be cleaned. There is no need to pay attention to the front and back sides of the support roller stand 8 when attaching it to the motor shaft 6 after completion.

In addition, the fitting parts 13 provided on both the upper and lower surfaces of the connecting part 9,
Although it is an essential condition that the shapes of the parts 13 are the same, there is no problem even if the positions in the rotational direction are shifted, and the shapes are not limited to the shapes shown.

<Effects> The present invention includes a support roller stand that is removably fitted onto a drive shaft and rotates, and also rotates a plurality of support rollers provided therein, thereby rotating a turntable placed on the plurality of support rollers. In the microwave oven equipped with the above-mentioned microwave oven, a fitting part that removably fits on the drive shaft is provided on both the upper and lower surfaces of the support roller base so that the rotation axes are the same, and the support roller base is connected to the drive shaft. By making it possible to reverse the installation from front to back,
This is of high practical value as it eliminates the need to pay attention to the front and back of the support roller stand when attaching it to the drive shaft after cleaning the support roller stand that was removed along with the turntable to clean the inside of the oven. .

[Brief explanation of the drawing]

FIG. 1 is a top view showing an embodiment of the support roller stand of the microwave oven of the present invention, and FIG.
3 is a top view showing an embodiment of a conventional support roller stand, and FIG. 4 is a sectional view taken along the line B--
5 is a sectional view of the main parts of a conventional microwave oven, Fig. 6 is a perspective view of the microwave oven with the door open, and Fig. 7 is a sectional view of other main parts of the conventional microwave oven. A cross-sectional view, FIG. 8 is an external perspective view of a conventional support roller stand, and FIG. 9 is a diagram illustrating the rotation of the tray. Code, 6: Motor shaft, 8: Support roller stand, 1
1: Support roller, 13, 13: Fitting part.

Claims (1)

[Scope of utility model registration request] It removably fits onto the drive shaft and rotates, and
In a microwave oven equipped with a support roller stand that rotates a plurality of support rollers and rotates a turntable placed on the plurality of support rollers, a fitting part that is detachably fitted to the drive shaft is provided. A microwave oven characterized in that a support roller stand is provided on both upper and lower surfaces so that the rotation axes are the same, and the support roller stand can be attached to the drive shaft by reversing it from front to back.