JPS607039Y2 - microwave oven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in microwave ovens, particularly in the rotary table mechanism.

Conventionally, in a microwave oven, the object to be heated, which is a cooking material, was rotated in a heating chamber to uniformly irradiate high-frequency energy to the object in order to heat the object evenly. The rotary table placed on the rotary table and the drive shaft rotated by the motor are made removable by a concave-convex engagement relationship, and the engagement accurately transmits the rotation of the drive shaft to the rotary table. Further, the lower peripheral edge of the rotary table is supported by a plurality of support members disposed on the same circumference so that the rotary table does not tilt during rotation.

The most common example is that a recess is formed in the center of the bottom of the rotary table made of heat-resistant glass, and a coupling made of heat-resistant resin is attached to the drive shaft. The surface is formed with a convex part that engages with the concave part of the rotary table, and since the materials of the rotary table and the coupling that engage with each other are slippery, the rotation of the drive shaft is accurate. At the same time, in order to ensure that the weight of the rotary table (weighs about 1.5 ka) and the object to be heated is not concentrated on the coupling but is distributed only to the plurality of supporting members, the recesses and protrusions are The parts had complicated shapes, the recesses were deeply carved, and the convex parts were prominently protruded.

Therefore, manufacturing these recesses and protrusions naturally takes time and effort, and dust and oil tend to accumulate in the complicatedly shaped recesses, and oil stains in particular tend to solidify when heated, making cleaning them extremely troublesome. Met.

In addition, since the rotary table can be rotated by the engagement relationship of the concave and convex portions, it is possible to drive heat-resistant containers such as regular plates without using the rotary table, especially if the drive shaft side is convex. It is difficult to place the rotary table directly on the drive shaft, and if the rotary table is used for another food or if it is damaged, cooking may be disrupted. When the rotary table is removed from the table and used as a tray, the above-mentioned concave or convex portions spoil its appearance, and this is particularly noticeable when the rotary table has a transparent glass bottom.

The present invention was developed under these circumstances, and its purpose is to connect a coupling rotated by a drive shaft and a rotary table placed on the coupling to which rotational force is transmitted. The parts that contact each other are flat surfaces, and the coupling side is connected to the drive shaft and is made of a material with high mechanical strength, and the coupling part is made of an elastic material with a high coefficient of friction. It is an object of the present invention to provide a microwave oven that is easy to use and eliminates the above-mentioned drawbacks of the conventional microwave oven by being configured with a rotation transmitting member that is detachable and transmits rotational force to the rotary table.

Hereinafter, one embodiment embodying the present invention will be explained with reference to FIGS. 1 to 4. In the drawings, reference numeral 1 denotes a heating chamber fixedly installed inside the case 2, and the front side is open and the open part is opened. A door body 3 is supported on one side so as to be openable and closable.

4 is a coupling that is rotatably supported by a bearing member 6 fixed in a transparent mounting hole in the center of the bottom plate 5 of the heating chamber 1, and the bottom shape is made of a synthetic resin material with low high frequency loss and high mechanical strength. The rotation transmitting member 8 is made of an elastic material such as silicone rubber, which has a low high frequency loss and a high coefficient of friction.

The connecting member 7 is formed with a locking hole 7a for connecting to the drive shaft 9 at the axial center of the portion that passes through the bearing member 6, and protrudes upward from the bearing member 6 (inside the heating chamber 1).
The upper surface of the mounting portion 7b, which is formed to expand in diameter in an umbrella shape, has a concave central portion sandwiching the ring-shaped protrusion 7c to save material, and the outer portion supports the rotation transmission member 8. The donut-shaped rotation transmitting member 8 placed here has six protrusions 8a formed to protrude downward and is a fitting part provided on the placing part 7b. 7d, and has a flat upper surface and a height equal to or higher than the ring-shaped protrusion 7c of the mounting portion 7b.

Note that the bearing member 6 has a length of 4 mm, which corresponds to the high temperature wavelength used, in order to prevent high frequency energy from leaking out of the heating chamber 1.
It has become 1/1.

Reference numeral 10 denotes a mounting piece 2a bent at the center of the bottom wall of the case 2.
The motor is supported by the mounting piece 2a, and is attached in a suspended manner to the connecting fitting 11 interposed between the mounting piece 2a, and rotationally drives the drive shaft 9 via a reduction gear mechanism (not shown).

Note that a rubber backing 12 for vibration isolation is interposed between the mounting piece 2a and the connecting fitting 11, and according to this configuration, the drive shaft 9 side is connected to the case 2, and the coupling 4 side is connected to the case 2. They are each independently supported by the bottom plate portion 5 of the heating chamber 1.

Reference numeral 13 denotes a plurality of (three in this embodiment) support rollers rotatably supported by a support plate 14 fixed to the upper surface of the bottom plate portion 5, which are arranged at equal intervals on a concentric circle with the coupling 4. It is located.

15 is a rotary table formed in a tray shape from heat-resistant glass or the like with low high frequency loss, on which the object to be heated is placed;
In the center of the lower surface, there are two shallow ring-shaped grooves 15a and 15b whose size almost matches the inner and outer diameters of the upper surface of the rotation transmission member 8.
is formed, and the part surrounded by the ring-shaped grooves 15a and 15b becomes a flat surface and a transparent part 15c that can be seen from above, and the ring-shaped grooves 15a and 15b of this transparent part 15c rotate. If the rotary table 15 is placed so that it matches the outer shape of the upper surface of the rotation transmission member 8 or so that the transparent portion 15c almost matches the upper surface of the rotation transmission member 8, the flat surface at the center of the lower surface will match the flat surface of the rotation transmission member 8. In addition to being in close contact with the upper surface so as not to slip, the bottom plate portion 5 is bent so that the coupling 4 sinks slightly downward due to the weight of the rotary table 15 and the object to be heated at this time, so that the peripheral edge of the lower surface of the rotary table 15 touches the support roller. It will be supported by 13.

15d is an annular supporting protrusion formed concentrically with the coupling 4 on the peripheral edge of the lower surface of the rotary table 15,
It has the function of reliably supporting the rotary table 15 when placed on any flat surface such as a dining table or cooking table, and if the rotary table 15 is set so that it is positioned outside of each support roller 13, the rotary table 15 can be rotated. Table 15 is heating chamber 1
It no longer collides with the inner wall, and it also functions as a positioning device when setting the rotary table 15.Furthermore, the rotary table 15 is prevented from colliding with the inner wall due to vibrations caused by the opening/closing operation of the door body 3.
It also prevents abnormal deviation.

To explain this rotary table 15 in more detail, in addition to the transparent portion 15c surrounded by the ring-shaped grooves 15a and 15b mentioned above, the lower surface of the rotary table 15 is also transparent in order to suppress the noise caused by the rolling contact of the support roller 13. It has a smooth surface 15e, and the other part has a transparent part 15c for positioning.
In addition, a satin pattern is applied to each transparent portion of the smooth surface 15e to make it stand out, making it an ingenious design.

In the microwave oven configured as described above, rotation can be transmitted between the rotary table 15 and the coupling 4 only by frictional contact between flat surfaces due to the weight of the rotary table 15 and the object to be heated placed thereon. Due to the connected structure, the production and cleaning of the rotary table 15 and the coupling 4 are facilitated, and a general heat-resistant container can be used as is in place of the rotary table 15. In order to ensure reliable support when placed on a flat surface such as a dining table, an annular support protrusion 15d formed on the lower surface is located outside of the support roller 13 for supporting rotational movement. At the center thereof, there is a transparent portion 1 corresponding to the size of the coupling 4 and visible from above.
By providing the coupling 4 with the drive shaft 9, it is possible to easily perform the mounting operation and obtain stable rotational movement of the rotary table.
The drive shaft 9 is constructed of a connecting member 7 connected to the rotary table 15 and a rotation transmitting member 8 in surface contact with the rotary table 15, and the rotation transmitting member 8 is configured to be removably attached to the connecting member 7. Rotation is reliably transmitted to the rotary table 15, and it is advantageous when cleaning oil stains on the rotation transmission member 8 that impede this rotation transmission or when replacing a deteriorated rotation transmission member 8.

Then, such a coupling 4 and a rotary table 15
When the rotary table 15 is placed on the coupling 4, the support roller 13 for assisting the transmission of rotational force between the heating chamber Since it is installed by utilizing the elasticity of the bottom plate portion 5 of 1, the auxiliary operation can be performed reliably and the contact between the flat surfaces of the coupling 4 and the rotary table 15 is not obstructed.

Regarding the flat surface of the upper surface of the rotation transmission member 8, if the surface is easy to clean and other heat-resistant tableware can be placed on it, it may be a rough surface rather than a smooth surface, or it may have a rough surface to some extent. Of course, it may also have a shape in which fine protrusions are formed.

As mentioned above, the present invention combines the coupling 4 and the rotary table 1.
The coupling member 7 is connected to the drive shaft 9 and is made of a material with high mechanical strength, and the coupling member 7 is made of an elastic material with a large coefficient of friction. The flat surface 15c at the center of the lower surface of the rotary table 15 can be attached to and detached from the connecting member 7.
The rotation transmitting member 8 is configured by a rotation transmitting member 8 that is in approximately planar frictional contact with the rotary table 15 and transmits motion so that the coupling 4 and the rotary table 15 rotate integrally only by the frictional contact. Compared to the motion transmission through the engagement relationship, the manufacturing and cleaning work is easier, and it also produces the various derivative effects mentioned above, and the practical effects of the present invention are great. be.

[Brief explanation of drawings]

Figure 1 is a sectional view of the main parts of the microwave oven according to the present invention, Figure 2 is an enlarged view of the main parts, Figure 3 is a partially exploded perspective view of the microwave oven, and Figure 4 is a partially exploded perspective view of the microwave oven.
The figure is a sectional view showing the positional relationship between the rotary table, the coupling, and the support roller. In the figure, 1 is a heating chamber, 4 is a coupling, 7 is a connecting member,
8 is a rotation transmission member, 9 is a drive shaft, 13 is a support roller which is a support member, and 15 is a rotary table.

Claims (1)

[Claims for Utility Model Registration] A coupling 4 is disposed at the center of the bottom surface of the heating chamber 1 and rotated in a horizontal plane by a drive shaft 9, and an object to be heated is placed thereon, and the center portion of the bottom surface is connected to the cup. A rotary table 15 is mounted so as to be in contact with the ring 4, and a rotary table 15 is provided so as to be able to come into contact with the lower peripheral edge of the rotary table 15 in order to rotatably support the rotary table 15. On the other hand, in a microwave oven equipped with a plurality of support rollers 13 arranged on substantially the same circumference, the coupling 4 is connected to a connecting member 7 connected to the drive shaft 9 and an elastic material having a large coefficient of friction. It has a plurality of protrusions 8a on its lower surface that are removably fitted into the fitting holes 7d provided in the connecting member 7, and its upper surface is located at the center of the lower surface of the rotary table 15. flat surface 15c
1. A microwave oven characterized by comprising a rotation transmitting member 8 that is in frictional contact with the rotary table 15 in a substantially planar manner and transmits motion such that the coupling 4 and the rotary table 15 rotate integrally only by the frictional contact.