JPH0810297Y2 - rice cooker - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker in which a hot plate is provided in the bottom of an inner case, and the rice cooker is placed on the hot plate.

[0002]

2. Description of the Related Art Conventionally, this type of rice cooker is (a)
As shown in FIG. 6, a hot plate E in which a heater D is embedded is provided on the bottom portion C of the inner case B forming the container body A, and the outer diameter of the hot plate E is smaller than the outer diameter of the bottom surface of the rice cooker. Then, this hot plate E
The bottom portion G of the rice cooker F is placed on the top, and a step is formed between the outer peripheral wall E1 of the hot plate E and the inner bottom surface of the corner portion B1 of the inner case B to form a recess S. It is generally done.

(B) In addition, the actual exploitation Sho 63-171114
As described in the publication, the outer peripheral edge of the heating plate provided in the bottom of the inner case extends upward along the corner of the outer periphery of the bottom of the rice cooker. There is also known a rice cooker provided with an annular ridge that hides a gap between extension portions of a plate.

[0004]

However, in the rice cooker of the conventional example (a), the outer peripheral wall E1 of the heating plate E and the inner case B are formed.
When rice grains, bedcloths, etc. fall into the step-like recess S between the inner bottom surface of the corner B1, the recess S becomes a dead space and is difficult to clean. There was a defect that heat was not easily transmitted to the part and the entire bottom surface of the rice cooker was not uniformly heated.

According to the rice cooker of the conventional example (b), the drawbacks of the conventional example (a) will be solved. However, this (b) requires a troublesome processing step of extending the outer peripheral edge of the hot plate upward to form the extension, and
There was a drawback that the outer diameter of the hot plate had to be increased.

In this invention, the corner portion of the inner case is raised to the height position of the placing surface of the hot plate to be continuously formed with the placing surface of the hot plate without any step, and the corner of the inner case is formed. By providing the portions close to each other along the curved surface of the corner portion of the rice cooker, the recessed portion and the extension of the hot plate of the conventional example are eliminated, thereby providing the one in which the above-mentioned drawbacks are eliminated.

[0007]

In order to solve the above problems, the present invention provides a rice cooker in which a hot plate is provided in the bottom of an inner case, and the rice cooker is placed on the hot plate.
The outer diameter of the placing surface of the hot plate with the rice cooker is smaller than the outer diameter of the bottom surface of the rice cooker, and the corner portion from the bottom surface to the side surface of the inner case is at the height position of the placing surface of the hot plate. Up to the upper surface of the hot plate to form a continuous surface without a step,
It is characterized in that they are arranged close to each other along the curved surface of the corner portion from the bottom surface to the side surface of the rice cooker.

In the above structure, the lid of the container body can be detachably provided on the container body.

[0009]

[First Embodiment] A first embodiment of the present invention will be described with reference to FIGS.
It will be described below based on. In FIG. 2, reference numeral 1 denotes a container body of a rice cooker, and the container body 1 includes an outer case 2, an inner case 3, a shoulder body 4, and a bottom plate 5. A hot plate 1 having a heater 11 embedded in the upper surface of the bottom 3a of the inner case 3.
0 is fixed with screws 12 or the like. The bottom surface 6a of the rice cooker 6 is placed on the hot plate 10.

The outer diameter of the placing surface 13 of the heating plate 10 with the rice cooker 6 is smaller than the outer diameter of the bottom surface 6a of the rice cooker 6. The corner portion 3b extending from the bottom surface to the side surface of the inner case 3 is continuously formed without a step with the mounting surface 13 of the heating plate 10 by rising to the height h position of the mounting surface 13 of the heating plate 10. To do.
At the same time, the corner portion 3b is arranged close to the curved surface of the corner portion 6b extending from the bottom surface to the side surface of the rice cooker 6.

The outer peripheral end surface 14 of the heating plate 10 and the inner bottom surface of the corner portion 3b of the inner case 3 are brought into contact with each other so as to form a substantially smooth surface a without any unevenness. That is, the outer peripheral end surface 14 of the heating plate 10 is inclined and the inner case 3
The corner portion 3b of the hot plate 10 contacts the inclined surface of the outer peripheral end surface 14 of the hot plate 10, and the upper side of this contact portion is the rice cooker 6
6 is formed integrally with each other so as not to cause the recess S shown in FIG. Such a configuration can be simplified by making the outer peripheral end surface 14 of the heat plate 10 an inclined surface and bending the bottom portion 3a of the inner case 3 as described above.

The lid 40 of the container body 1 is not limited to a system in which it is fixed by a hinge so as to be rotatable in an arc, but is also applicable to a lid body 40 detachably provided from the container body 1 as shown in FIG. it can. When used in such a detaching method, the lid can be easily detached, and thus there is an advantage that rice grains and the like dropped on the smooth surface a of the inner case 3 can be more easily cleaned.

Various structures for removing the lid 40 in FIG. 2 can be adopted. As an example, a structure for which the applicant of the present application has already applied for a utility model will be briefly described with reference to FIG. In FIG. 2, an upper arm cover 42 and a lower arm cover 43 are pivotally supported by a pivot shaft 44 on a hinge cover 41 fixed to a rear end portion of the shoulder body 4 so that the upper arm cover 42 and the lower arm cover 42 can be rotated. A leaf spring 45 is interposed between the parts 43. On the other hand, the lid body 40 is integrally formed by an upper lid plate 46 and a lower lid plate 47. A downward projection 45a is formed on the lower surface of the leaf spring 45,
An upward projecting portion 46a is formed on the upper surface of the upper cover plate 46, and the upward projecting portion 46a of the upper cover plate 46 is attached to the leaf spring 4.
The lid 40 is attached to the container body 1 through the upper and lower arm covers 42 and 43 by elastically engaging with the downward protrusion 45a of the container 5. When removing the lid 40 from the container body, the downward projection 45a of the leaf spring 45 and the upper lid plate 46 are
The engagement with the upward protrusion 46a is released.

In FIG. 2, reference numeral 48 is a brake plate which prevents the lid 40 from being opened suddenly, and 49 is a rice cooker lid.
Reference numeral 50 is a shoulder heat retaining heater, and 51 is a side heat retaining heater provided on a side portion of the inner case 3.

An example of an electric circuit of the rice cooking heater 11, the shoulder warmer heater 50, the side warmer heater 51 and the like in this embodiment will be described below with reference to FIG. Electric power from the power source 52 is supplied to the rice cooking heater 11, the side warmer heater 51, and the shoulder warmer heater 50 through a temperature fuse 53 that detects and abnormally heats the rice cooker 6, and
The voltage is stepped down by the step-down transformer 54, rectified by the rectifier 55, and supplied to the microcomputer 56 as its power supply.

The rice cooking heater 11, the shoulder warmer heater 50, and the side warmer heater 51 are connected in parallel with each other. During rice cooking, the side heaters 51 and the shoulder warmer heaters 50 are simultaneously heated at the same time as the rice cooking heater 11 is heated, and the outer peripheral end of the heating plate 10 provided with the rice cooking heater 11 comes into contact with each other. The vicinity of the corner portion 3b of the inner case 3 is also heated by the heat conduction from the rice cooking heater 11 together with the side surface heat retaining heater 51. Therefore, during cooking rice, the heater 11 for cooking rice and the side warmer heater 5
As a result of heating the entire surface of the rice cooker 6 not only from 1 and the shoulder warmer heater 50 but also from the above-mentioned proximity or contact vicinity of the corner portion 3b of the inner case 3, the heat efficiency of cooking rice is improved. Even when the outer peripheral end of the heat plate 10 and the corner 3b of the inner case are close to each other, the radiant heat from the heater 11 for cooking rice has almost the same effect as the case of the conductive heat.

At the time of heat retention, the side warmer heater 51 and the shoulder warmer heater 50 start keeping warm and heat the rice cooker 11 at the same time, and the corner portion 3b of the inner case 3 is provided with the rice cooker 11. Since it is in contact with the heating plate 10, as in the above, not only the side surface warming heater 51 and the shoulder warming heater 50, but also the entire surface of the rice cooker 6 is kept warm from the contact portion with the heating plate 10, Efficiency is improved. Even in this case, as described above, even when the outer peripheral edge of the heating plate 10 and the corner 3b of the inner case are close to each other, the radiant heat from the rice cooking heater 11 has substantially the same effect as in the case of the conductive heat. is there.

A normally open contact 57a of a relay 57 is connected to the heater 11 for cooking rice. Excitation / demagnetization of the relay coil 57b of the relay 57 is controlled by a transistor 58 which is ON / OFF controlled by a command from the microcomputer 56. Reference numeral 59 is a diode for absorbing a counter electromotive force generated when the relay coil 57b is demagnetized.

Reference numerals 60 and 61 in the figure denote triacs, and the gates of these triacs 60 and 61 are turned on / off by a command from the microcomputer 56.
Control signals from the controlled transistors 62 and 63 are provided.

The microcomputer 56 operates on the basis of the clock signal from the reference frequency generator 64, and according to a predetermined program, the transistors 58, 62,
The control of 63 is performed to specifically control the power supply to the heater 11, the shoulder warmer heater 50, and the side warmer heater 51. This power supply control is performed based on the output signal from the temperature sensitive element 65 incorporated in the center sensor 26. Reference numeral 66 is a rice cooker set sensor that detects whether or not the rice cooker 6 is set. 67 is a menu switch, 68 is a heat retention / cancellation switch, 69 is a rice cooking switch, and 70 is a cooking switch.

[0021]

FIG. 4 shows a second embodiment. In this embodiment, an annular step portion 20 is formed at the corner portion 3b of the inner case 3, and the hot plate 10 is attached to the annular step portion 20.
The outer peripheral end surfaces 14 of the above are brought close to each other without making contact with each other, and other configurations are configured as shown in FIG. In this way, even when the corner portion 3b of the inner case 3 and the outer peripheral end surface 14 of the heating plate 10 are brought close to each other, the thermal efficiency is almost the same as the conduction heat due to the radiant heat of the rice cooking heater 11 (heating plate 10). There is.

[0022]

[Third Embodiment] FIG. 5 shows a third embodiment. In this embodiment, an outward flange portion 21 is formed on the outer peripheral end surface 14 of the heat plate 10, while an annular step portion 22 is formed on the corner portion 3b of the inner case 3, and the annular step portion 22 is formed with the external step. Facing collar 21
Are fitted and contacted in a drop shape, and the other configurations are configured as shown in FIG.

[0023]

According to the present invention, (1) the outer diameter of the surface of the hot plate on which the rice cooker is placed is smaller than the outer diameter of the bottom of the rice cooker,
The corner portion from the bottom surface to the side surface of the inner case is raised to the height position of the mounting surface of the hot plate and is formed continuously with the mounting surface of the hot plate without any step. It is difficult for rice grains, sticks, etc. to fall between the mounting surface of the inner case and the inner bottom surface of the inner case, and the mounting surface of the hot plate and the inner bottom surface of the inner case are substantially smooth surfaces with no steps. Easy to clean.

(2) Further, the corner of the inner case is
Since they are arranged close to each other along the curved surface of the corner from the bottom to the side of the rice cooker, the outer peripheral edge of the hot plate faces upward along the corner of the bottom circumference of the rice cooker as in the conventional example (b). There is no need to extend it, and the structure is simple by simply forming the corners on the inner case itself. Moreover, even when the outer diameter of the placing surface of the heating plate is smaller than the outer diameter of the bottom surface of the rice cooker, the corners of the inner case are close to each other along the curved surface of the corner of the rice cooker. The heat from the heater is efficiently heated to the corner portion of the rice cooker by the conduction heat and the radiant heat from the plate.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of FIG. 2 showing a first embodiment of the present invention.

FIG. 2 is an overall vertical sectional view of the first embodiment of the present invention.

FIG. 3 is an electric circuit diagram of the first embodiment.

FIG. 4 is a longitudinal sectional view of a main part of a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a main part of a third embodiment of the present invention.

FIG. 6 is a front view showing a part of a conventional example in a vertical section.

[Explanation of symbols]

 3 Inner case 3a Bottom part 3b Corner part 6 Rice cooker 6a Bottom surface 6b Corner part 10 Heat plate 11 Heater 13 Mounting surface 14 Outer peripheral end face 20 Annular step part 21 Outward flange part 22 Annular step part 24 Annular step part 25 Auxiliary rice cooking heater 50 Shoulder insulation heater 51 Side insulation heater a Smooth surface h Height of hot plate mounting surface

Claims (1)

[Scope of utility model registration request] 1. A rice cooker in which a heating plate 10 is provided in a bottom portion 3a of an inner case 3 and the rice cooker 6 is placed on the heating plate 10, wherein the heating plate 10 is mounted on the rice cooker 6. The outer diameter of the placing surface 13 is the rice cooker 6
Is smaller than the outer diameter of the bottom surface 6a of the inner case 3, and the corner portion 3b extending from the bottom surface to the side surface of the inner case 3 has a mounting surface 1 for the heating plate 10.
3 rises up to the height h position and is continuously formed with the placing surface 13 of the heating plate 10 without any step, and closes along the curved surface of the corner 6b extending from the bottom surface to the side surface of the rice cooker 6. Rice cooker characterized by being made.