JPH041850Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heating plate mounting structure for a rice cooker.

(Prior art) As shown in FIG. 3, the heating plate 1 in a conventional rice cooker is constructed by screwing a screw 4 through a hole 11 provided in an outer container 10 into a screw hole 3 in a boss portion 2 provided at the bottom of the heating plate 1. By inserting the heating plate 1 into the outer container 10, the short ribs 5 in the circumferential direction provided on the outer edge of the heating plate 1 were attached to the bottom surface of the outer container 10 by being brought into pressure contact with the bottom surface. In addition, 6 is an annular heater provided on the heating plate 1, 7 is a mounting hole for the temperature detection element 9 of the inner container 8, 14 is a case, 15 is a heat insulating material, and 16 is a bottom member.

Furthermore, in recent years, a coated metal plate is often used for the outer container 10, and the heat resistance temperature of the coating is approximately
The temperature is 180℃.

(Problem to be solved by the invention) By the way, the outer container 10 of the heating plate 1 as described above
In the mounting method, the boss portion 2 of the heating plate 1 comes into contact with the outer container 10 over a considerable area, so the outer container 1
A large amount of heat escapes to zero, resulting in large heat loss,
If foreign matter adheres to the top surface of the heating plate 1, the heat of the heating plate 1 will not be sufficiently transferred to the inner container, but will be transferred from the contact surface to the outer container 10, and in particular, the temperature around the screw fastened portion will increase due to the coating. There are problems in that the heat resistance temperature is exceeded, and the painted surface changes color and a strange odor is generated due to burnt paint.

In order to solve the above problem, for example, a stainless steel pipe or the like is interposed between the heating plate and the outer container,
A method of fixing with screws through the stainless steel pipe or the like may be considered, but this method causes problems in terms of assembly workability and cost.

(Means to Solve the Problems) Therefore, the present invention provides a heating plate mounting structure for a rice cooker in which a heating plate is attached to the bottom of the outer container with screws, in which the outer container 10 comes into contact with the heating plate 1. Screw mounting holes 11 are formed by burring in the burring process, the heating plate is brought into approximately point contact with the cut and raised part 12 formed by this burring process, and the screws 4 are screwed into the screw mounting holes. As a result, the outer container and the heating plate are integrated.

(Operations and Effects) With the above structure, the heating plate 1 and the outer container 10 come into contact with each other in an extremely small area at the tip of the cut-out portion 12 provided on the outer container 10, so that heat is not transferred to the outer container 10. There is little heat, there is no discoloration of the painted surface of the outer container 10, there is no burnout of the paint, and there is no generation of strange odors.

Moreover, since the cut-and-raised portion 12 can be formed at the same time as the outer container 10 is formed, the cost does not increase unlike in the case of using a conventional stainless steel pipe, and there is no problem of poor assembly workability.

(Example) Figures 1 and 2 show an example of the present invention.
The same parts as those in the figure and FIG. 4 are given the same reference numerals.

In the present invention, as shown in the figure, the outer container 1
The screw attachment hole 11 provided in the outer container 10 is made by burring, and a cut-out portion 12 is formed upwardly in the outer container 10. As is well known, a large number of serrations are formed at the tip of the cut and raised portion 12. Therefore, when the screw 4 is screwed into the boss portion 2 of the heating plate 1 through this hole 11, the heating plate 1 will have the lower surface of the boss portion 2 aligned with the protrusion 1.
2, and the rib 5 of the heating plate 1 is connected to the outer container 10.
It will be installed by pressure contact.

That is, the heating body 1 is in contact with the outer container 10 over a very small area (approximately point contact), and a large amount of heat from the heating element 1 is not transmitted to the outer container 10 as in the conventional case. Note that if the ribs 5 provided on the outer edge of the heating plate 1 are provided slightly inward from the outer edge of the heating plate 1 as shown in the figure, even if discoloration occurs in the outer container 10 at this portion, the discolored portion will not be visible from above. You can make it invisible.

Furthermore, in order to further reduce the contact area of the ribs 5 with the outer container 10, as shown in FIG.
It is more effective to provide small ribs 13 in the radial direction on the outer container 10 so as to be orthogonal to the ribs 5 so as to bring them into approximately point contact.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a rice cooker equipped with a heating plate mounting structure according to the present invention, Fig. 2 is a partial sectional view showing a modification of Fig. 1, and Fig. 3 is a partial sectional view of a conventional rice cooker. FIG. 4 is a partially enlarged sectional view of FIG. 3. 1... Heating body, 2... Boss part, 4... Screw, 5
...Rib, 6...Heater, 10...Outer container, 11
... hole, 12 ... incision, 13 ... rib.

Claims (1)

[Scope of utility model registration request] In a heating plate mounting structure for a rice cooker in which a heating plate is attached to the bottom of an outer container with screws, a screw mounting hole is provided by burring at the contact part of the outer container with the heating plate, and the hole is formed by this burring. A heating plate for a rice cooker, characterized in that the outer container and the heating plate are integrated by bringing the heating plate into approximately point contact with the cut edge portion and screwing screws into the screw mounting holes. Mounting structure.