JPS5928639Y2 - Mechanical parts used in microwave oven turntable mechanisms - Google Patents

Description

[Detailed description of the invention] The present invention is a microwave oven equipped with a turntable that rotates on which the object to be heated is placed so that the object to be heated, which is the cooking material, is uniformly irradiated with high-frequency energy. This relates to mechanical parts used in the mechanism.

If the above-mentioned turntable is molded from metal, there is a risk that leakage current may flow from the rotary drive mechanism to the rotary table, so it is necessary to interpose an insulating material between the rotary shaft and the drive shaft of the turntable. .

The purpose of the present invention is to separate a block of insulating synthetic resin bags into which a connecting member connecting a drive shaft and a rotating shaft of a turntable and a bearing member of the rotating shaft are integrated, and separate them when assembled. By using it as a connecting member and a bearing member, the two parts, the bearing member and the connecting member, can be molded at the same time by molding one block, reducing the number of molding steps and making it easier to assemble the turntable. At the time of attachment, after fixing the bearing member part of the block to the bottom wall of the heating chamber, the rotating shaft of the turntable is inserted into the connecting member part of the block, and the turntable is simply pressed downward. To provide a microwave oven in which a member is separated from a bearing member and fitted onto a drive shaft, and the turntable and the drive shaft can be easily and reliably connected.

An embodiment embodying the present invention will be described below with reference to the drawings. In the drawing, 1 is a case of this microwave oven, 2 is a motor fixed to the inner bottom surface of the case 1, and the motor is connected via a reduction gear mechanism 3. A metal drive shaft 4 projects upward.

Reference numeral 5 denotes a heating chamber fixedly installed within the case 1, and a mounting hole 7 is transparently provided in the center of the bottom wall portion 6 of the heating chamber.

Reference numeral 8 denotes a bearing member of a synthetic resin bag fixed in the mounting hole 7, and a lower small diameter portion 8a is fitted into and supported by a sleeve 9 fixed to the lower surface of the bottom wall portion 6.

Further, this sleeve 9 has a length that is one quarter of the high frequency used to prevent high frequency energy from leaking out of the heating chamber 5, and thus constitutes a choke.

Reference numeral 10 denotes a metal turntable rotatably installed at the bottom of the heating chamber 5 and equipped with an article placement section 11 for placing an object to be heated. A rotating shaft 13 is integrally fixed thereto, and the rotating shaft 13 rotatably passes through the bearing member 8 and projects downward.

Reference numeral 14 denotes a synthetic resin connecting member that connects the rotary shaft 13 and the drive shaft 4 so as to transmit rotation, and the lower end of the rotary shaft 13 and the upper end of the drive shaft 4 are inserted into the upper and lower engagement holes 15, respectively. Small-diameter engagement protrusions 16 and 17 integrally formed to protrude are inserted and locked.

Therefore, the rotating shaft 13 and the drive shaft 4 are electrically insulated by the connecting member 14.

Further, as shown in FIG. 2, the connecting member 14 is integrally connected to the lower end of the bearing member 8 at its upper peripheral edge via the thin wall portion 18 during molding, so that both 8 and 14 constitute one block. It is molded as follows.

Therefore, the two members, the bearing member 8 and the connecting member 14, only need to be molded into one block, and the number of molding steps can be reduced.

When the turntable 10 is assembled and connected to the drive shaft 4, the sleeve 9 and the bearing member 8 portion of the block are assembled to the bottom wall 6 of the heating chamber 5, as shown in FIG. Later, the rotating shaft 13 of the turntable 10 is inserted into the bearing member 8 from above, and the lower end of the rotating shaft 13 is brought into contact with the upper surface of the connecting member 14 integrated with the bearing member 8, and the engaging protrusion 16 is inserted into the upper engagement hole 15, and then the turntable 10 is pressed downward with strong force, the connecting member 14 is separated from the bearing member 8 at the thin wall portion 18, and the lower part of the connecting member 14 is engaged. The hole 15 is fitted into and locked with the engagement protrusion 17 of the drive shaft 4 .

Therefore, just by pushing the turntable 10 strongly downward,
The rotating shaft 13 and the driving shaft 4 can be easily and reliably connected in an electrically insulated state.

In this way, the present invention reduces the number of molding steps by separating the synthetic resin block in which the connecting member and the bearing member are integrated during assembly and using them as the bearing and the connecting member, respectively. It has an excellent effect of making assembly easy and reliable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the microwave oven, FIG. 2 is a sectional view before the bearing member and connecting member are separated, and FIG. 3 is a sectional view after they are separated. Drive shaft 4, bearing member 8, turntable 10, rotating shaft 1
3. Connecting member 14, thin part 18°

Claims (1)

[Scope of Claim for Utility Model Registration] A bearing member for rotatably supporting the rotating shaft of the turntable on which the heated part is placed on the bottom wall of the heating chamber, and a driving shaft for rotating the turntable. A connecting member for connecting the rotary shaft of the turntable in an electrically insulated state is integrated as a single synthetic resin bag block through a thin wall portion that connects the two so that they can be easily separated. A mechanical part used in a turntable mechanism of a microwave oven, characterized by a