JPH07265200A - Rice cooker - Google Patents

Abstract

PURPOSE:To provide the simple rice cooker having an earthing structure capable of serving a stable earthing function irrespective of variability of processing and thermal elasticity of the components such as the bottom frame. CONSTITUTION:In this rice cooker having the earthing structure of the electric system including a rice cooker heater 8 and a heat insulating heater 12 in the main body, parts of the conductive members each between the electric parts mutually adjacent are pressure welded each other to form the earth connection of the earthing structure.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Generally, a rice cooking heater and a heat-retaining heater are provided near the outer pot in the main body of the electric rice cooker, and electric parts constituting an electric circuit such as a control board and a cord reel are provided at the bottom of the main body. Installed. When insulation failure occurs in these electric systems, an electric shock may occur due to electric leakage. Therefore, it is usually adopted that the above-mentioned outer pot and metal parts are brought into contact with each other with a conductive material or connected with a lead wire and electrically connected to a ground terminal provided on the bottom surface of the main body to form a ground structure. ing. The present invention relates to a rice cooker, and more particularly to a rice cooker having a ground structure inside a main body.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view of a rice cooker having a conventional ground structure. In FIG. 8, 1 is a lid, 2 is a main body,
3 is an upper frame and 4 is a hinge pin. 5 is an outer pot, 6 is a mounting plate, 7 is a mounting screw, 8 is a rice cooker heater, 9 is an insulator on which the rice cooker heater 8 is mounted, 10 is a holding plate for the insulator 9, 11 is screwed to the mounting plate 6. A screw for attaching the insulator 9 and a heat-retaining heater 12 wound around the outer pot 5.

Reference numeral 15 is a bottom frame, 17 is a cord reel, and 17a.
Is a metal cover of the cord reel, 18 is a bottom plate, and 20 is a lead wire. Further, 22 and 24 are connection plates, 23 and 25 are screws, 26 is a ground terminal, and 27 is a ground wire. Metal plates are used for the connection plates 22 and 24. One end of the connection plate 22 is fixed to the mounting plate 6 with a screw 23, and the other end is integrally fixed to the connection plate 24 with the screw 25 sandwiching the bottom frame 15. . The free end of the connection plate 24 is in contact with the metal cover 17a.

As described above, the outer pot 5 is connected to the mounting plate 6 by the screw 7, and the rice cooking heater 8 is electrically connected to the mounting plate 6 by the holding plate 10 and the screw 11. The mounting plate 6 is connected to the bottom plate 18 by the lead wires 20 on the one hand, and the connecting plate 2 on the other hand.
2, 24 are connected to the metal cover 17a. Even if the insulation of the rice cooking heater 8 and the warming heater 12 is broken, the metal parts such as the outer pot 5 and the rice cooking heater 8 are touched by the screw 26 and the ground wire 27 attached to the bottom plate 18 by the connection between the parts. Also, the earth structure works and there is no safety problem.

[0005]

Since the conventional grounding structure is constructed as described above, the contact pressure between the metal cover 17a and the connecting plate 24 varies depending on the degree of processing precision of the connecting plates 22 and 24. Change. If the processing accuracy decreases, the assembly of the cord reel becomes hard, and the connecting plates 22, 24
A gap is created in the contact, making contact unstable. Also, when the bottom frame 15 is thermally expanded by the heating of the rice cooking heater 8, the contact pressure between the connection plate 24 and the metal cover 17a changes. Therefore, in the conventional ground structure, there is a problem that the ground structure may malfunction due to deterioration of processing accuracy and thermal expansion of the constituent members.

The present invention has been made in order to solve the above-mentioned problems, and it has a simple structure and can provide a stable grounding function even when variations in processing and components such as a bottom frame expand and contract due to heat. The purpose of the present invention is to realize a rice cooker with a grounding structure that can be used.

[0007]

The present invention relates to a rice cooker provided with a grounding structure for electric parts of an electric system including a rice cooking heater and a heat retaining heater provided in a main body, and a conductive property of adjacent electric parts in the electric parts. This is a rice cooker in which parts of the members are pressed against each other to form a ground connection of a ground structure.

Further, a lid for covering the upper part of the main body, an upper frame for supporting a cylindrical outer pot with a bottom, an inner pot removably accommodated in the outer pot, and an inner pot provided between the outer pot and the outer pot. Cooked rice heater,
Insulation heater attached to the outer periphery of the outer pot, main body case attached to the upper frame and having an opening on the bottom, and attachment of a cord reel that closes the opening of the main body case and fixes the control board housing and metal cover A rice cooker comprising a bottom frame having a portion, a bottom plate for covering the control board housed in the bottom frame and fixing the cord reel, and a grounding structure of an electric system including a rice cooking heater and a warming heater The bottom part of the rice cooker is provided with a projecting piece and is pressed against the metal leg of the cord reel to form an earth connection. In addition, the rice cooker is formed by forming the protruding piece into a V shape.

Further, a lid for covering the upper part of the main body, an upper frame for supporting a bottomed cylindrical outer pot, an inner pot removably housed in the outer pot for receiving food to be cooked, an inner pot and an outer pot The rice cooking heater provided between the pots, the heat retaining heater provided on the outer periphery of the outer pot, the main body case attached to the upper frame and having the opening portion on the bottom surface, the opening portion of the main body case is closed, and the control board storage portion and In a rice cooker provided with a bottom frame provided with a cord reel mounting portion to which a metal cover is fixed, a bottom plate that fixes the cord reel and covers the control board, and a grounding structure of an electric system including a rice cooking heater and a warming heater, This is a rice cooker in which the screw for fixing the metal cover to the cord reel is also used as the ground terminal.

[0010]

In the bottom plate according to the present invention, the projecting piece is provided at a position facing the metal leg of the cord reel at the time of mounting. Therefore, even if variations in processing occur, the assembly work is little affected and the contact between the projecting piece and the metal leg is stable. is doing.

[0011]

【Example】

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. Figure 1
1 is a configuration explanatory view of a first embodiment of the present invention, FIG. 2 is a bottom view of a main body according to the first embodiment of the present invention, and FIG. 3 is an exploded perspective view showing a configuration of a main part of the main body of the first embodiment of the present invention. . The structure of the main part of the embodiment of the present invention is the same as that of the conventional device and the same reference numerals are given, but it will be described in a little more detail.

1 to 3, 1 is a lid, 2 is a main body, 3 is an upper frame of the main body 2, and 4 is a hinge pin. Lid 1
Is connected to the upper frame 3 by hinge pins 4 so as to be openable and closable, and covers the upper opening of the main body 2. 5 is a cylindrical outer pot with a bottom,
Reference numeral 6 is a mounting plate, and 7 is a mounting screw. The outer pot 5 is fixed by mounting a flange on the upper frame 3, and a mounting plate 6 is mounted on the bottom surface by mounting screws 7. Reference numeral 8 is a rice cooking heater, 9 is an insulator, 10 is a holding plate, 11 is a screw, and 12 is a heat retaining heater. The rice cooking heater 8 is held on the insulator 9 by being held by the circular arc portion of the holding plate 10 by the screw 11 screwed to the mounting plate 6, and the warming heater 12 is wound around the outer periphery of the outer pot 5 near the upper portion. ing.

Reference numeral 13 is an inner pot, and 14 is an outer case. The inner pot 13 is housed in the outer pot 5 so that the bottom face is spaced apart from the rice cooking heater 8 by a predetermined distance and can be taken out freely. Also, the outer case 14
Is fixed to the upper frame 3, and the bottom surface is open. 15
Is a bottom frame, 16 is a control board, 17 is a cord reel for supplying AC power, 17a is a metal cover of the cord reel 17,
Reference numeral 18 is a bottom plate, and 20 is a lead wire for grounding. Bottom frame 1
Reference numeral 5 is a flange piece 15 attached to the bottom surface of the outer case 14 to close the opening and into which the storage portion of the control board 16 and the cord reel 17 fit.
A circular mounting part forming a is provided.

The cord reel 17 is molded by a resin case 17d into a circular disk shape having an open upper surface, and a circular arc groove 17b for preventing rotation is formed on the peripheral surface. Further, three metal legs 17c are provided on the upper surface of the metal cover 17a,
A cord fixed inside the resin case 17d with a screw and covering the opening of the circular upper surface is housed. Further, the bottom plate 18 is formed by machining a metal plate as shown in the drawing, and a claw piece 18a corresponding to the circular arc groove 17b is formed in the circular arc portion facing the outer periphery of the cord reel 17. The bottom plate 18 covers the control board 16 stored in the storage portion of the bottom frame 15, and the cord reel 1 is attached to the attachment portion so that the control board 16 is rotated by fitting into the attachment portion.
The area around 7 is suppressed.

Particularly, in the embodiment of the present invention, the main body 1
The following measures have been taken for the ground structure inside the car.
Reference numeral 21 is a protruding piece. As shown in FIG. 5, the protruding piece 21 is formed in a dogleg shape, and the bottom plate 18 has the metal leg 17c.
It is integrally molded at the position corresponding to. Then, as described above, the claw piece 18a is engaged with the circular arc groove 17b so that the bottom plate 1
When 8 is fixed, the bottom plate 18 and the cord reel 17 are integrated with each other, and at the same time, the projecting piece 21 is pressed against the metal leg 17c so that both are mechanically and electrically fixed. Reference numeral 26 is a terminal screw forming a ground terminal, and 27 is a ground wire for grounding.

Next, the operation of the embodiment of the present invention will be described. Since both the conductive materials are crimped by the screw 7 screwed to the mounting plate 6, the outer pot 5 and the mounting plate 6 are electrically connected. The rice cooking heater 8 is fixed to the mounting plate 6 by a holding plate 10 and screws 11, and the mounting plate 6 is connected to the bottom plate 18 by a lead wire 20. Further, the protruding piece 21 is pressed against the metal leg 17c, and the bottom plate 18 is the metal cover 17a of the cord reel 17.
Connected to. As a result, all the electric components to which the current is supplied inside the main body 1 are electrically connected to form the ground structure E having the same potential.

Here, even if the insulation of the heaters 8 and 12 is destroyed, a leakage current is grounded through the earth wire 27 by the earth structure E composed of the electric parts such as the mounting plate 6 and the like, and there is a safety problem. Absent. Since the cord reel 17 and the bottom plate 18 are substantially integrally coupled with each other by screwing the claw piece 18a into the circular arc groove 17b, the projecting piece 21 and the metal leg 17c are not loosely pressed. In addition, since the electrical connection between the cord reel 17 and the bottom plate 18 is achieved at the same time as assembling, it is possible to save the trouble of ground connection. Further, since the connecting plates 22 and 24 of the conventional structure are not necessary, the number of parts is reduced and the number of assembling steps can be further reduced.

Embodiment 2 FIG. 7 is a plan view of a cord reel according to another embodiment of the present invention. Although the ground structure E in which the bottom plate 18 and the metal leg 17c are in contact with each other is shown in the first embodiment, the fixing screw 28 for fixing the metal cover 17a to the resin case 17d is fixed to the ground terminal T.
The structure is applied to. And the fixing screw 28
However, it is used for both fixing and grounding. According to the second embodiment, since the structure is not affected by the processing accuracy of the parts and the heat, the stability of the electrical connection is significantly improved, and the first embodiment is improved.
It is possible to obtain the same effect as described above and further simplify the structure.

Incidentally, if the connection state of the earth structure E of the present invention and the conventional one is shown, it can be expressed as follows, and the construction of the earth connection from the mounting plate to the earth terminal can be simplified. Conventional structure → Lead wire 20 → Metal cover 17a Mounting plate 6 → → Connection plate 22 → Connection plate 24 → Bottom plate 18 → Ground terminal 26 Inventive structure Mounting plate 6 → Lead wire 20 → Bottom plate 18 → Ground terminal 26 ↑ ↓ Metal cover 17a

In the above-described embodiment, the case where the "V" -shaped protruding piece of the bottom plate and the metal leg of the metal cover are pressed to form the ground connection has been described, but they are provided adjacent to each other in the main body. It is not necessarily limited to the embodiment as long as it is an electric component.

[0021]

According to the present invention, in a rice cooker provided with a grounding structure for electric parts of an electric system including a rice cooker and a heat retaining heater provided in a main body, a part of conductive members of adjacent electric parts in an electric part is provided. To form a ground connection of the earth structure by pressing each other.

Further, a lid for covering the upper part of the main body, an upper frame for supporting a cylindrical outer pot with a bottom, an inner pot removably accommodated in the outer pot, and an inner pot provided between the outer pot and the outer pot. Cooked rice heater,
Insulation heater attached to the outer periphery of the outer pot, main body case attached to the upper frame and having an opening on the bottom, and attachment of a cord reel that closes the opening of the main body case and fixes the control board housing and metal cover In a rice cooker comprising a bottom frame having a portion, a bottom plate for covering the control board housed in the bottom frame and fixing the cord reel, and a ground structure for an electric part of an electric system including a rice cooking heater and a warming heater A rice cooker having a ground plate provided with a protruding piece on a bottom plate and being pressed against a metal leg of a cord reel to form a ground connection was constructed. In addition, a rice cooker was formed in which the protruding pieces were formed in a "V" shape.

Further, a lid for covering the upper part of the main body, an upper frame for supporting a cylindrical outer pot with a bottom, an inner pot removably housed in the outer pot for receiving food to be cooked, an inner pot and an outer pot The rice cooking heater provided between the pots, the heat retaining heater provided on the outer periphery of the outer pot, the main body case attached to the upper frame and having the opening portion on the bottom surface, the opening portion of the main body case is closed, and the control board storage portion and In a rice cooker provided with a bottom frame provided with a cord reel mounting portion to which a metal cover is fixed, a bottom plate that fixes the cord reel and covers the control board, and a grounding structure of an electric system including a rice cooking heater and a warming heater, A rice cooker was constructed in which the screw that fixes the metal cover to the cord reel was also used as the ground terminal.

As a result, according to the present invention, the bottom plate 18 has a protruding piece 18a which comes into pressure contact with the metal leg 17c of the cord reel 17.
Since the above is provided, it is possible to reduce the number of parts, reduce variations in processing of component parts in the main body and influence of heat, obtain a stable ground structure, and provide inexpensive parts.

[Brief description of drawings]

FIG. 1 is a configuration explanatory diagram of a first embodiment of the present invention.

FIG. 2 is a bottom view of the main body according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view showing the configuration of the main part of the main body according to the first embodiment of the present invention.

FIG. 4 is a plan view showing the relationship between the cord reel and the bottom plate according to the first embodiment of the present invention.

5 is a side view of the bottom plate protruding piece in the X direction of FIG. 4. FIG.

FIG. 6 is a side view of the metal leg in the X direction of FIG.

FIG. 7 is a plan view of a cord reel according to another embodiment of the present invention.

FIG. 8 is an explanatory diagram of a configuration of a conventional rice cooker.

[Explanation of symbols]

 2 Main body 3 Upper frame 5 Outer pot 6 Mounting plate 7 Mounting screw 8 Rice cooker heater 9 Insulator 10 Holding plate 11 Screw 12 Heat retention heater 14 Outer case 15 Bottom frame 16 Control board 17 Code reel 17a Metal cover 17b Arc groove 17c Metal leg 17d Resin case 18 Bottom plate 18a Claw 20 Lead wire 21 Projecting piece 26 Ground terminal 27 Ground wire E Ground structure

Claims (4)

[Claims] 1. A rice cooker provided with a grounding structure for electric parts of an electric system including a rice cooking heater and a warming heater provided in a main body, wherein parts of conductive members of adjacent electric parts of the electric parts are pressed against each other. The rice cooker is characterized in that the ground connection of the above-mentioned ground structure is formed. 2. A lid for covering the upper part of the main body, an upper frame for supporting a cylindrical outer pot with a bottom, an inner pot removably accommodated in the outer pot, and a gap between the inner pot and the outer pot. A rice cooking heater, a warming heater attached to the outer periphery of the outer pot, a main body case attached to the upper frame and having an opening at the bottom, and an opening of the main body case to close the storage of the control board. Frame and a bottom frame provided with a cord reel mounting part to which a metal cover is fixed, a bottom plate that covers the control board housed in the bottom frame and fixes the cord reel, and an electric system including the rice-heating heater and the warming heater A rice cooker provided with a grounding structure for electric parts according to claim 1, wherein a protruding piece is provided on the bottom plate of the grounding structure, and the grounding is formed by press-contacting the metal leg of the cord reel. 3. The rice cooker according to claim 2, wherein the protruding piece is formed in a V shape. 4. A lid for covering an upper part of the main body, an upper frame for supporting a cylindrical outer pot with a bottom, an inner pot detachably accommodated in the outer pot for receiving a food to be cooked, and the inner pot. And a rice cooker provided between the outer pot and the outer pot, a heat retaining heater provided on the outer periphery of the outer pot, a main body case attached to the upper frame and having an opening at the bottom surface, and the opening of the main body case is closed and controlled. A bottom frame provided with a board reel and a cord reel mounting portion to which a metal cover is fixed; a bottom plate that fixes the cord reel and covers a control board; and electric components of an electric system including the rice cooking heater and the heat retaining heater. A rice cooker having a ground structure, wherein a screw for fixing the metal cover to the cord reel is also used as a ground terminal.