JPH0810145A - rice cooker - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rice cooker with a lid body that reduces the restrictions on the appearance design, saves material and is lightweight, and is inexpensive by reducing the number of parts while improving the durability of the hinge part. The purpose is to do. [Structure] Rice cooker main body 1 that detachably accommodates a pan 3 for heating cooked food, hollow molded resin lid 5 that covers rice cooker main body 1 openably and closably, and is fixed to lid 5 One of the heat sink 12 and the rice cooker body 1 and the lid body 5, the hinge portion 7 that pivotally supports the hinge shaft 7a provided on the lid body in the rice cooker body 1, and the hinge portion 7 is substantially opposite to the hinge portion 7. Is provided on the side, the engaging means for engaging the rice cooker body 1 and the lid body 5, the lid body 5 is provided with a steam discharge port 19 for discharging steam during cooking, and the hinge shaft 7a is attached to the lid body 5. Bearing part 6 provided integrally
I'm supposed to be supported by only.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker routinely used in ordinary households.

[0002]

2. Description of the Related Art In recent years, rice cookers are required to have many functions, their usability and excellent design. Therefore, the structure is complicated, the weight is increased, and it is found that the appearance quality and durability are not always satisfactory.

In the conventional rice cooker, as shown in FIG. 5, there is known a rice cooker main body provided with a hook lever for opening the lid with one touch.
That is, in the figure, the rice cooker main body 51 is the body 52
And an inner frame 53 provided inside thereof and an upper frame 54 on the upper side. A heating element 55 for heating rice and a thermostat 56 for detecting the completion of rice cooking are provided on the inner bottom portion of the inner frame 53, and a removable rice cooking pot 57 is further provided.

Reference numeral 58 denotes a lid, which is composed of a substantially box-shaped outer lid 58a, an outer lid cover 58b and a seal packing 58c. The outer lid cover 58b is provided with an inner lid 59 and is hinged. In the portion 60, a shaft 61 is pivotally supported on one side of the rice cooker main body 51 so as to be openable and closable. In addition, a spring 62 that constantly urges the lid body 58 in the direction of opening the lid body 58 in relation to the shaft 61.
A damper 63 and a damper spring 64 are provided in the vicinity of the shaft 61 for absorbing a shock when the lid 58 is opened.
Is provided.

On the other hand, inside the rice cooker main body 51 located on the side opposite to the side on which the lid 58 is rotatably supported, a hook lever 65 for engaging the lid 58 in the opened state is provided with a shaft 66 and an attached. The hook lever 65 is attached using a biasing spring 67, and the hook lever 65 is exposed to the outside from the side wall of the rice cooker main body 51 as an operating portion 68 for partially pressing the hook lever 65. Further, a hook 69 for engagement is provided on the lid 58 facing the hook lever 65.
Is provided. When the operating portion 68 is pushed, the hook lever 65 and the hook 69 are disengaged, and the lid 58 is opened.

[0006]

However, in the above-mentioned conventional structure, both the outer lid 58a and the outer lid cover 58b are made of a thermoplastic resin, so that the warp at the time of molding and the temperature rise at the time of heating the heating element 55 by energization. Due to the temporary thermal deformation of the lid 58 due to the above, a gap with the upper frame 54 is likely to occur.

In order to prevent this gap, it is necessary to use a metal fitting, for example, to improve the rigidity in the vicinity of the hook 69, and to take a countermeasure, and there is a drawback that the shape of the metal fitting restricts the design in many cases. It was

Further, since the lid body is composed of the outer lid and the outer lid cover, it is heavy and it is necessary to increase the moment of the spring when the lid is automatically opened.
There was a problem that the life of the spring was short and the material cost of the lid was high.

The present invention solves the above-mentioned problems of the prior art by taking advantage of the hollow molding, reducing the constraint conditions of the external design, saving material and weight, and reducing the number of parts, which is inexpensive and the hinge portion. In addition to providing a lid cooker with improved durability, the lid's rigidity is increased to make it even stronger, and appearance defects such as sink marks and welds on the lid surface, which are peculiar to hollow molding. The present invention aims to provide a rice cooker with improved appearance quality.

[0010]

[Means for Solving the Problems] A first means of the present invention for achieving the above object is a pan for heating a food to be cooked, and a rice cooker having an upper surface opened and the pan being detachably accommodated. The main body and the top opening of the rice cooker main body are openably and closably covered,
A cover body hollow-molded with a resin and a gas for hollowing, a heat dissipation plate fixed to a heat dissipation plate mounting boss of the cover body by a mounting screw, and provided on the cover body on one side of the rice cooker body and the cover body. A hinge part for pivotally supporting the hinge shaft on the rice cooker body, engaging means for engaging the rice cooker body and the lid body on a side substantially opposite to the hinge part, and for the lid body. The hinge shaft is provided with a steam outlet for discharging steam during cooking, and the hinge shaft is supported only by a bearing portion integrally provided on the lid.

The second means comprises a hinge spring on the lid side of the hinge portion on the lid side, and the hinge spring is penetrated and supported by a hinge shaft.

The third means is a structure in which the hinge spring lid side acting portion is fixed by a cover attached to the lid.

A fourth means is to open a pan for heating the food to be cooked, a rice cooker main body for opening the upper surface and accommodating the pan in a detachable manner, and opening and closing the upper opening of the rice cooker main body with a hinge portion. A lid body that is freely formed by resin and a gas for hollowing, a radiator plate that is fixed to a radiator plate mounting boss of the lid body by a mounting screw, and the rice cooker body is substantially opposite to the hinge portion. An engaging means for engaging the lid body, a steam discharge port for discharging steam during cooking in the lid body, and a concealing member. The lid body is provided with a hollow gas injection part. A resin injection part provided on the inner surface side of the lid in the vicinity of the coupling means, and a resin injection part provided on the outer surface side of the lid part near the vapor discharge port between the hollow gas injection part and the vapor discharge port. This is due to the structure in which a hidden member is attached so as to cover the portion.

The fifth means is to open a pan for heating the food to be cooked, a rice cooker main body for opening the upper surface of the rice cooker and detachably accommodating the pan, and opening and closing a top opening of the rice cooker main body with a hinge. A lid body which is freely formed by resin and a gas for hollowing, an engagement means which engages the rice cooker body and the lid body on a side substantially opposite to the hinge portion, and a resin body on the lid body. An injection part, a hollow gas injection part, and a steam discharge port are provided, and a cross-sectional area of a direction perpendicular to the resin flow direction is provided only on the inner surface side of the lid body from the resin injection part toward the hollow gas injection part. This is due to the configuration in which the thick portion having a large size is provided.

A sixth means is that the thick portion of the lid body has a smaller cross-sectional area as the distance from the hollow gas injection portion increases.

The seventh means is that the radiating plate mounting boss of the lid is
This is because the rib is not connected to other high-strength portions at a position higher than the tip of the mounting screw.

[0017]

According to the present invention, since the hinge shaft is supported only by the bearing portion of the lid, the rattling and the reduction in rigidity due to the use of separate parts are eliminated, and the rigidity of the bearing portion is secured by the integral structure. Therefore, the strength of the hinge shaft and the bearing can be secured.

Further, since the lid can be made lightweight by hollow molding, the moment of the hinge spring for the automatic opening operation can be made small. Therefore, the stress applied to the periphery of the hinge portion can be reduced, and the impact when the lid is opened can be reduced.

By fixing the lid-side acting portion of the hinge spring to the cover attached to the lid, the shape and material of the cover can be made different from that of the lid, and the strength of the hinge can be increased. Can be improved.

Further, since the hollow gas injection portion is provided on the inner surface side of the lid, the gas injection trace can be hidden by the heat radiating plate. Further, by disposing the resin injecting portion in the vicinity of the vapor discharge port, it is possible to hide the resin injecting portion by the concealing member without a feeling of strangeness.

Further, since the cross-sectional area in the direction perpendicular to the resin flow direction becomes large only in the direction from the hollow gas injection portion to the resin injection portion, the hollow gas injection portion, which has an uneven thickness, flows during molding. Since it does not become the end, it is possible to prevent the occurrence of welds and sink marks.

Since the cross-sectional area of the thick portion becomes smaller as the distance becomes larger than that of the hollow gas injecting portion, turbulent flow is less likely to occur in the resin flow toward the hollow gas injecting portion. It is possible to prevent surface unevenness and the like caused by the flow.

Further, since the heat radiating plate mounting boss is not connected to another high strength portion by a rib or the like at a position higher than the tip of the mounting screw, it can be easily deformed. Therefore, it is possible to relieve the stress caused by the dimensional change of the lid and the heat dissipation plate at high temperature, and it is possible to prevent the occurrence of cracks or cracks.

[0024]

An embodiment of the present invention will be described below with reference to the drawings.

1 to 4, reference numeral 1 denotes a main body of a rice cooker, a body 2 having an open upper surface, and an upper frame 4 which is located inside the upper opening of the body 2 and constitutes a storage portion for a pan 3. It is composed of Reference numeral 5 denotes a lid that covers the upper opening of the body 2 so as to be openable and closable, and is made of polypropylene and is hollow-molded with nitrogen gas.

Reference numeral 7 denotes a hinge portion, and a hinge shaft 7a inserted in a bearing portion 6 formed integrally with a part of the lid 5 is rotatably supported by an upper frame 4 so as to be openable and closable. Further, 7b is a hinge spring, and the spring portion is penetrated and supported by the hinge shaft 7a. The hinge spring lid side acting portion 7c has a higher strength than the lid 5, and is made of a polypropylene-containing lid cover 8 of a reinforcing material.
The upper frame side action portion is fixed to the upper frame 4 to urge the lid body 5 in the opening direction to automatically open the lid body 5.

A hook lever 9 is provided on the upper frame 5 at a position substantially opposite to the hinge portion 7.
Is rotatably supported on the upper frame 5 by a hook lever shaft 10. Reference numeral 9a is a claw provided at the tip of the hook lever 9. Reference numeral 9b is a hook lever spring which is provided on the opposite side of the claw 9a via the hook lever shaft 10 and biases the hook lever 9 toward the lid body 6.

Reference numeral 11 denotes a hook portion provided on the lid 5, which together with the hook lever 9 constitutes an engaging means for engaging or disengaging the rice cooker main body 1 and the lid 5. 12 is a heat sink,
Reference numeral 12a is a mounting screw, which is a radiating plate mounting boss 1 provided on the lid 5.
The radiator plate 12 and the lid 5 are fixed at 3.

Reference numeral 14 denotes a cylindrical portion for fixing the heat dissipation plate 12 to the lid 5, and reference numeral 15 denotes an inner peripheral hollow portion provided on the surface side of the lid 5 of the cylindrical portion 14 having a hollow structure, so that high strength is secured. are doing.

Here, from the heat sink mounting boss 13 to the cylindrical portion 1
No reinforcing ribs or the like are provided at a position higher than the tip of the mounting screw 12a, and the heat dissipation plate mounting boss 13 can be easily deformed at a position higher than the tip of the mounting screw 12a.

Reference numeral 16 denotes an outer peripheral hollow portion, and inner peripheral hollow portion 15
And the connection portion 17 having an uneven thickness. Reference numeral 18 denotes a hollow gas injection portion for injecting nitrogen gas immediately before the material for injection molding tries to contract when it cools and solidifies, and prevents sink marks at the time of contraction, in the vicinity of the hook portion 11.
It is provided on the inner surface side of the lid body 5. A steam discharge port 19 is for discharging steam generated from the inside of the rice cooker body 1 during cooking.

Reference numeral 20 denotes a resin injection portion, which is an outer surface side of the lid body 5,
It is arranged between the hollow gas injection unit 18 and the steam discharge port 19 near the steam discharge port 19. 20a is a steam discharge caution seal, which is used when steam is discharged from the steam discharge port 19.
It displays a danger prevention notice such as burns and calls attention, and hides the mark of the resin injection part.

Reference numeral 21 denotes an inner surface side of the lid body 5, which is a thick portion provided from the hollow gas injection portion 18 to the vicinity of the resin injection portion 20, and has a cross-sectional area as the distance from the hollow gas injection portion 18 increases. It will be small. Reference numeral 22 denotes a pan packing which is provided on the outer periphery of the heat dissipation plate 12 and is brought into pressure contact with the pan 3 when the lid body 6 is closed.

Reference numeral 23 is an induction coil provided on the inner bottom of the rice cooker body 1, and reference numeral 24 is an inverter circuit for exciting the induction coil. 25 is a thermistor for detecting the completion of rice cooking.

The operation of the rice cooker configured as above will be described below. When the pan 3 is heated by the induction coil 23 excited by the inverter circuit 24 during rice cooking, the lid 6 tends to be deformed by the heat, but the lid 5
High strength can be ensured by the inner peripheral hollow portion 15, the outer peripheral hollow portion 16 and the connecting portion 17 provided at, and deformation can be prevented.

On the other hand, since the hinge shaft 7a is supported only by the bearing portion 6 which is integrally formed by only the lid body 5, there is no rattling or reduction in rigidity due to the use of another component, and the strength of the hinge portion 7 is improved. Can be secured. Further, as described above, the lid body 5 is hollow and lightweight while maintaining high strength, so that the spring moment of the hinge spring 7b can be weakened. Therefore, the stress applied to the hinge portion 7 can be reduced, and the hinge spring lid side acting portion 7c can be fixed by the lid cover 8 having higher rigidity than the lid body 5, so that the hinge portion 7 can be further secured.
The durability can be improved and the number of components around the lid 5 can be reduced.

Further, since the hollow gas injection portion 18 is provided on the inner surface side of the lid body 5, the surface of the lid body 5 can be kept smooth and the gas injection traces on the inner surface can be hidden by the heat radiating plate 12. By arranging the resin injection part 20 near the steam discharge port 19, it can be hidden by the steam discharge caution seal 20a or the like.

Here, since the cross-sectional area in the direction perpendicular to the resin flow direction becomes larger only in the direction of the resin injection part 20 from the hollow gas injection part 18, the hollow gas injection part 18 having uneven thickness is formed. Since it does not become a flow end at the time of molding, it is possible to prevent the occurrence of welds, sink marks and the like.

Further, the thick portion 2 whose cross-sectional area changes gradually
According to 1, the resin can be filled in the vicinity of the hollow gas injection portion 18 early and smoothly, that is, in a laminar flow without causing a turbulent flow. And the like can be prevented.

In addition, since the heat dissipation plate mounting boss 13 is not connected to other high-strength portions by ribs or the like at a position higher than the tip of the mounting screw 12a, it can be deformed independently. Therefore, the stress due to the dimensional change of the lid 5 and the heat dissipation plate 12 at a high temperature can be relaxed by the deformation, occurrence of cracks and cracks can be prevented, and the durability of the lid 5 can be improved.

[0041]

As is apparent from the description of the above embodiments, according to the present invention, since the hinge shaft is supported only by the bearing portion of the lid, there is no play or reduction in rigidity due to the use of another component. It is possible to secure the rigidity of the bearing portion by eliminating the above and to provide a rice cooker with more improved hinge portion durability.

Further, since the lid body can be made lightweight by hollow molding, the moment of the hinge spring for the automatic opening operation can be made small. Therefore, it is possible to reduce the stress applied to the periphery of the hinge portion, reduce the impact when the lid is opened, improve the durability of the hinge portion, and provide the rice cooker with less impact when the lid is opened.

By fixing the lid-side acting portion of the hinge spring to the cover attached to the lid, the shape and material of the cover can be made different from that of the lid, and the strength of the hinge can be increased. Can be improved.

Further, since the hollow gas injection portion is provided on the inner surface side of the lid, the gas injection trace can be hidden by the heat radiating plate. Further, by disposing the resin injecting portion in the vicinity of the steam outlet, it is possible to hide the resin injecting portion by the concealing member without a feeling of incongruity, so that it is possible to realize a lid body which is hollow and has a high quality.

Further, since the cross-sectional area in the direction perpendicular to the resin flow direction becomes large only in the direction of the resin injection part from the hollow gas injection part, the hollow gas injection part having an uneven thickness flows during molding. Since it does not become the end, it is possible to prevent the occurrence of welds, sink marks, etc., and it is possible to obtain a lid body having no appearance defect.

Since the cross-sectional area of the thick wall portion becomes smaller as the distance becomes larger than that of the hollow gas injection portion, turbulent flow is less likely to occur in the resin flow toward the hollow gas injection portion. It is possible to obtain a lid body having no appearance defect.

Further, since the heat radiation plate mounting boss is not connected to other high-strength portions by ribs or the like at a position higher than the tip of the mounting screw, it can be easily deformed. Therefore, stress due to dimensional changes of the lid and the heat sink at high temperature can be relieved, cracks and cracks can be prevented from occurring, and the durability of the lid can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rice cooker showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an internal configuration of a main part of a lid of a rice cooker showing an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing an internal configuration of a main part of a lid of a rice cooker showing an embodiment of the present invention.

FIG. 4 is a plan view of a lid of a rice cooker showing an embodiment of the present invention.

FIG. 5 is a vertical sectional view of a conventional rice cooker.

[Explanation of symbols]

 1 Rice Cooker Main Body 2 Body-3 Pan 4 Top Frame 5 Lid 6 Bearing 7 Hinge 7a Hinge Shaft 7b Hinge Spring 7c Hinge Spring Lid Side Action 8 Lid Cover 9 Hook Lever 10 Hook Lever Shaft 11 Hook 12 Radiating Plate 12a Mounting screw 13 Radiating plate mounting boss 14 Cylindrical part 15 Inner hollow part 16 Outer peripheral hollow part 17 Connection part 18 Gas injection part for hollow 19 Steam discharge port 20 Resin injection part 20a Steam discharge caution seal 21 Thick part 22 Pan Packing 23 Induction coil 24 Inverter circuit 25 Thermistor

Front page continuation (72) Inventor Hachiro Yoshida 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Haruo Ishikawa, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A pot for heating an item to be cooked, a rice cooker main body having an upper surface opened so as to detachably accommodate the pan, and a hollow-molded resin which covers the upper opening of the rice cooker main body in an openable and closable manner. Made of a lid, a radiator plate fixed to a radiator plate mounting boss of the lid by a mounting screw, and a hinge shaft provided on the lid body on one side of the rice cooker body and the lid body. A hinge portion pivotally supported by the main body, engagement means for engaging the rice cooker main body and the lid body, which is located substantially opposite to the hinge portion, and steam for discharging steam during cooking to the lid body. A rice cooker having a discharge port, wherein the hinge shaft is supported only by a bearing portion integrally provided on the lid body. 2. The rice cooker according to claim 1, wherein a hinge spring is provided on the lid side of the lid side hinge portion, and the hinge spring is penetrated and supported by a hinge shaft. 3. The rice cooker according to claim 2, wherein the hinge spring lid side acting portion is fixed by a cover attached to the lid. 4. A pot for heating an object to be cooked, a rice cooker main body having an upper surface opened to accommodate the pan in a detachable manner, and a hollow covering an upper opening of the rice cooker main body with a hinge portion so as to be openable and closable. A molded resin lid body, a heat radiation plate fixed to a heat radiation plate mounting boss of the lid body by a mounting screw, and the rice cooker body and the lid body are engaged substantially on the opposite side of the hinge portion. An engaging means, a steam outlet for discharging steam during cooking to the lid, and a concealing member are provided, and a hollow gas injecting portion is provided on the inside of the lid near the engaging means. A rice cooker provided with a resin injection part on the outer surface side of the lid near the steam discharge port between the hollow gas injection part and the steam discharge port, and a hidden member attached so as to cover the resin injection part. . 5. A pan for heating a food to be heated, a rice cooker main body having an upper surface opened to accommodate the pan in a detachable manner, and a hollow covering an upper opening of the rice cooker main body with a hinge portion so as to be openable and closable. A molded resin lid, and engaging means for engaging the rice cooker main body and the lid on substantially the opposite side of the hinge portion,
The lid is provided with a resin injection part, a hollow gas injection part, and a vapor outlet, and only the direction from the resin injection part to the hollow gas injection part is provided in the resin flow direction on the inner surface side of the lid. A rice cooker provided with a thick portion that has a large cross-sectional area in the direction perpendicular to it. 6. The rice cooker according to claim 5, wherein the thick portion of the lid body has a smaller cross-sectional area as the distance from the hollow gas injection portion increases. 7. The rice cooker according to claim 1, wherein the heat radiating plate mounting boss of the lid is not connected to another high strength portion by a rib or the like at a position higher than the tip of the mounting screw.