JPH08448A - Rice cooker - Google Patents

Abstract

PURPOSE:To facilitate the cleaning of a bottom surface by simplifying working and assembling. CONSTITUTION:A rice cooker has an external body 3, a bottom 4 mounted at the lower end thereof 3, a cylindrical internal body 5 which is housed in the external body 3 with the upper end thereof being in contact with a shoulder part 8 of the external body 3 and a heating plate 6 which forms the bottom of the internal body 5 being in contact with the lower end of the internal body 5. A heat shielding plate 26 is mounted on the underside of the heating plate 6 while a plurality of fixing columns 13 are hung along the internal body 5 from the internal surface of the shoulder part 8 of the external body 3. A fixing screw 28 is screwed into the fixing columns 13 through the heat shielding plate 26 to press the heating plate 6 toward the shoulder part 8 of the external body 3, thereby grasping the internal body 5 between the heating plate 6 and the shoulder part 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker, and more particularly to a mounting structure for a heating plate of a container body and an inner case.

[0002]

2. Description of the Related Art As shown in FIG. 9, a container body of a conventional rice cooker has an outer case 51, a bottom 52 attached to the lower end of the outer case 51, and a housing 52 housed in the outer case 51. Bottom outer container 53
It consists of The upper end of the outer container 53 is hooked on the shoulder portion 54 of the outer body 51. A heating plate 55 is housed inside the bottom of the outer container 53, and a heat shield plate 56 is located outside the bottom. The heating plate 55 and the heat shield plate 56 are attached to the mounting screw 5
It is attached to the bottom surface of the outer container 53 by 7. Then, from the outside of the bottom 52, attach the fixing screw 58 to the heat shield plate 56.
The bottom 52 is fixed to the lower end of the outer case 51 by being screwed in, and at the same time, the outer container 53 is drawn downward through the heat shield plate 56 in the figure and attached integrally with the outer container 53. The pan 59 is housed in the outer container 53, and the bottom surface of the pan 59 contacts the top surface of the heating plate 55.

[0003]

SUMMARY OF THE INVENTION The conventional container body 5 described above.
Since the outer container 51 of 0 is a bottomed container and is formed from a flat plate by press working, it takes time to process, and a large amount of material is used, which is expensive. Further, in the conventional structure, there is a step between the upper surface of the heating plate 55 and the bottom surface of the outer container 53, which makes it difficult to clean, and rice grains and dust are likely to accumulate in this step portion, which tends to be unsanitary. there were. An object of the present invention is to solve the above problems, and an object thereof is to provide a rice cooker including a container body which is easy to process and assemble and whose bottom surface is easily cleaned.

[0004]

In order to achieve the above object, the present invention provides an outer case, a bottom attached to a lower end of the outer case, and an inside of the outer case as described in claim 1. A cylindrical inner case that is housed and whose upper end abuts the shoulder of the outer case,
A heating plate that abuts a lower end of the inner body to form a bottom of the inner body, and presses the heating plate toward a shoulder portion of the outer body so that the inner body is provided between the heating plate and the shoulder portion. It was something that was held.

As a preferred embodiment, as described in claim 2, an annular flange portion is formed along the outer peripheral edge of the heating plate, and the lower end of the inner case is heated along the inner surface of the flange portion. You may contact | abut the outer peripheral edge. Further, as described in claim 3, while attaching a heat shield plate to the lower surface of the heating plate, a plurality of fixing columns are vertically provided from the inner surface of the shoulder portion of the outer case along the inner case, and the fixing screws are attached. It is preferable that the heating plate is pressed toward the shoulder portion of the outer case by being screwed into the fixing column via the heat shield plate, and the inner case is sandwiched between the heating plate and the shoulder section. Further, as described in claim 4, it is possible to screw the fixing screw into the fixing column through the bottom and the heat shield plate.

[0006]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a rice cooker according to the present invention, which is composed of a container body 1 and a lid 2. The container body 1 roughly includes an outer case 3, a bottom 4, an inner case 5, a heating plate 6, and a pot 7. A shoulder portion 8 extends inward at the upper end of the outer case 3. On the upper front of the outer body 3,
A display / operation panel 9 is provided, and on the back side of the display / operation panel 9, that is, on the inner side of the outer case 3, a display / operation board 10 including a liquid crystal display and switches is attached.

A handle 11 is attached to the side surface of the outer case 3. When the handle 11 is tilted, it hits the handle receiver 12 and is supported.
In addition, inside the outer case 3, a part 4 that hangs downward from the shoulder 8 is formed.
A column 13 for fixing the heating plate of the book is provided so as to project. The bottom 4 is fitted to the lower end of the outer case 3 to cover the outer case 3 from below. A cord reel 14 of a power cord is attached to the lower surface of the bottom 4.

As shown in FIG. 3, the inner case 5 has a cylindrical shape in which a thin plate is wound and both ends thereof are joined together by a cut-out, and curls 5a and 5b are formed at the upper and lower ends thereof. This inner body 5
The upper end curl portion 5 a of the outer shell 3 is in contact with the shoulder portion 8 of the outer shell 3, and the lower end curl portion 5 b is in contact with the outer peripheral edge of the heating plate 6. As shown in FIGS. 2 and 3, a sensor mounting hole 15 is provided in the lower portion of the inner case 5, and a sensor holder 17 holding a temperature sensor 16 is mounted in the sensor mounting hole 15. The temperature sensor 16 is biased inwardly of the inner case 5 by the coil spring 18, and comes into pressure contact with the side surface near the bottom of the pan 7 when the pan 7 is housed in the inner case 5. There is.

The sensor holder 17 is provided with a limit switch 19 for detecting the presence or absence of the pan 7. When the pan 7 is not present, the arm 21 at the tip of the rod 20 integrally provided with the temperature sensor 16 is pressed against the limit switch 19 to detect the absence of the pan 7, and when the pan 7 is accommodated and the temperature sensor 16 is retracted. As a result of the arm 21 being separated from the limit switch 19, the presence of the pan is detected.

The heating plate 6 is formed by integrally molding the sheathed heater 22, and the upper surface thereof is convexly curved so as to match the bottom surface of the pot 7. A flange portion 23 is provided on the outer peripheral edge of the heating plate 6, and the lower end curl portion 5b of the inner case 5 is placed inside the flange portion 23. Eight legs 24 are provided in the vicinity of the outer periphery of the lower surface of the heating plate 6, and two bosses 25 project from the center. Two
Reference numeral 6 denotes a heat shield plate, which is applied to the legs 24 of the heating plate 6 from below and is attached by screwing a mounting screw 27 into the boss 25. The mounting structure of the heating plate 6 integrated with the heat shield plate 26 and the inner case 5 will be described later in more detail. The pot 7 is a bottomed container, which is housed in the inner case 5 and placed on the heating plate 6. The bottom surface of the pan 7 is curved along the top surface of the heating plate 6.

On the other hand, the lid body 2 has a lid ring 30 attached to the inside of the lid outer plate 29 and a lid packing 31 on the outer periphery.
A heat radiating plate 32 provided with is attached to the lower surface of the lid ring 30. A bush 34 having a vent 33 is attached to the heat dissipation plate 32, and the vent 33 is attached to the lid outer plate 2
It communicates with the exhaust port 35 formed in 9. Heat sink 32
A heat retention heater 36 is disposed on the upper surface of the. The lid 2 is attached to the container body 1 so as to be openable and closable with a hinge shaft 37 as a fulcrum. When the lid 2 is closed, the hook 38 at the tip is engaged with the hook lever 39 to maintain the closed state, and the lid packing 31 is pressed against the pot 7 to be sealed. Further, when the hook lever 39 is pushed, the engagement with the hook 38 is released, and the spring 40 automatically opens.

Next, the structure and procedure for attaching the inner case 5 and the heating plate 6 will be described in detail. Three ribs 41 formed in the longitudinal direction of the heating plate fixing column 13
4 is further extended downward as shown in FIG.
Are three guide protrusions 42 protruding from the tip of the. A screw hole 43 is formed at the tip of the fixing column 13.

As shown in FIG. 7, the heat shield plate 26 is provided with guide holes 44 and screw insertion holes 45 corresponding to the guide protrusions 42 and screw holes 43. Further, as shown in FIG. 3, the bottom 4 is provided with a cylindrical projection 46 that corresponds to the heating plate fixing column 13 and projects inward from the bottom surface. The inside of the protrusion 46 is a fixing screw accommodating recess 47 that opens downward. As shown in FIGS. 6 and 7, a notch 48 and a screw insertion hole 49 are formed at the upper end of the protrusion 46, corresponding to the guide protrusion 42 and the screw hole 43 of the fixing column 13. .

To attach the inner case 5 and the heating plate 6 to the outer case 3, first, as shown in FIG. 3, the inner case 5 is inserted into the outer case 3 and its upper end curl portion 5a is inserted into the outer case 3. Abut the shoulder portion 8 of the. Then, the heating plate 6 to which the heat shield plate 26 is attached
To contact the lower end curl portion 5b of the inner case 5. At this time,
As shown in FIG. 4, the guide protrusion 42 of the fixing column 13 is inserted into the guide hole 44 of the heat shield plate 26. As a result, the fixing column 13 and the screw insertion hole 45 of the heat shield plate 26 are aligned with each other. Next, the bottom 4 is attached to the outer case 3. Also at this time, the guide protrusion 42 of the fixing column 13 is inserted into the notch 48 of the protrusion 46. As a result, the screw hole 43 of the fixing column 13 and the screw insertion hole 45 of the heat shield plate 26,
The screw insertion holes 49 of the protrusion 46 are aligned.

In this state, the fixing screw 28 is inserted into the screw insertion hole 49 from the recess 47 of the bottom 4 and screwed into the screw hole 43 of the fixing column 13. As the fixing screw 28 advances, the bottom 4 is pressed upward in FIG. 3, and accordingly the heat shield plate 2
Since 6 is also pressed upward, the heating plate 6 is pressed toward the inner case 5, and the inner case 5 is pressed toward the shoulder 8. On the contrary, the guide protrusion 42 of the fixing column 13 enters the notch 48 of the protrusion 46. In this way, the inner case 5 and the heating plate 6 are firmly sandwiched between the shoulder 8 and the bottom 4 of the outer case 3 via the heat shield plate 26.

In the above embodiment, the inner case 5 and the heating plate 6 are pressed against the shoulder 8 of the outer case 3 via the heat shield plate 26, but as shown in FIG. A plurality of ears 6a may be provided on the outer peripheral portion, and the ears 6a may be screwed into the fixing column 13 through the fixing screws 6b. Further, in the above-mentioned embodiment, the fixing work of the inner shell 5 and the heating plate 6 and the fitting work of the bottom 4 and the outer shell 3 are performed at the same time by the fixing screw 28, but the mounting work of both is performed by separate screws. It may be performed. That is, first, before attaching the bottom 4, the fixing screw 28 is attached via the heat shield plate 26.
After fixing the inner case 5 and the heating plate 6 by screwing into the outer case 3, the bottom 4 is attached to the outer case 3, and separate fixing screws are screwed into the heat shield plate 26 from the screw holes provided at different positions to fix the bottom 4. To do.

[0017]

As is apparent from the above description, according to the invention of claim 1, the inner case is not a bottomed container like the conventional outer container but a cylindrical shape in which a plate is wound. It is easy to process, requires few materials, and is inexpensive. Further, since the heating plate is directly in contact with the lower end of the inner case and the heating plate itself forms the bottom of the inner case, there is no step at the bottom and the surface is flat and easy to clean. Therefore, rice grains and dust can be completely removed, and the rice can be kept clean at all times.

In addition to this, in particular, according to the invention of claim 2, since the heating plate has the flange portion on the outer peripheral edge, thermal deformation of the outer peripheral edge can be prevented, and the flange portion can be prevented. Along the bottom of the inner shell is in contact with the heating plate,
The heating plate can be easily attached to the inner case without being displaced. Further, according to the invention of claim 3, since the heating plate and the inner case are attached using the existing heat shield plate, the structure is simplified. Further, according to the invention of claim 4, the fixing of the inner case and the heating plate to the outer case and the fixing of the bottom to the outer case are performed at the same time, so that the assembly is quick and easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rice cooker according to the present invention.

FIG. 2 is a cross-sectional view showing a mounted state of a temperature sensor.

FIG. 3 is an exploded cross-sectional view showing a mounting structure of an inner case and a heating plate.

FIG. 4 is an enlarged cross-sectional view showing a mounting state of a fixing screw.

5 is a cross-sectional view taken along line I-I of FIG.

6 is a sectional view taken along line II-II of FIG.

FIG. 7 is a partially cutaway bottom view of the bottom.

FIG. 8 is an enlarged cross-sectional view of the contact portion between the inner case and the heating plate.

FIG. 9 is a cross-sectional view showing a structure of a container body of a conventional rice cooker.

[Explanation of symbols]

3 ... Outer body, 4 ... Bottom, 5 ... Inner body,
6 ... Heating plate, 8 ... Shoulder,
13 ... Heating plate fixing column, 23 ... Flange part, 26 ... Heat shield plate, 28 ... Fixing screw.

Claims (4)

[Claims] 1. An outer case, a bottom attached to a lower end of the outer case, a cylindrical inner case housed in the outer case and having an upper end abutting a shoulder portion of the outer case, and the inner case. A heating plate that contacts the lower end of the body to form the bottom of the inner case, and presses the heating plate toward the shoulder of the outer case to hold the inner case between the heating plate and the shoulder. Rice cooker characterized by that. 2. An annular flange portion is formed along an outer peripheral edge of the heating plate, and a lower end of the inner case is brought into contact with an outer peripheral edge of the heating plate along an inner surface of the flange portion. The rice cooker according to claim 1. 3. A heat shield plate is attached to a lower surface of the heating plate, and a plurality of fixing columns are vertically hung from an inner surface of a shoulder portion of the outer case along the inner case, and fixing screws are provided through the heat shield plate. 3. By screwing the heating plate toward the shoulder of the outer body by screwing the heating plate toward the shoulder of the outer body, the inner body is sandwiched between the heating plate and the shoulder. Rice cooker described in either. 4. The rice cooker according to claim 3, wherein the fixing screw is screwed into the fixing column through the bottom and the heat shield plate.