JPH0513312Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention relates to a lid unit for a rice cooker, and in particular,
This invention relates to a reinforcing structure in a lid unit made of synthetic resin.

<Prior art and problems to be solved by the invention> Conventionally, rice cookers have a structure in which a lid unit is attached to the main body of the rice cooker, which removably accommodates the inner pot, with a lid unit that can be opened and closed using connecting bolts. is commonly used.

A known lid unit for such a rice cooker has a structure in which a heat insulating material storage space is formed by an upper cover and a lower cover made of synthetic resin, and a heat sink is attached to the lower surface of the lower cover.

With use, the lid unit with this structure will
The upper cover and lower cover, especially the lower cover, were often thermally deformed due to the hot air from the inner pot and the heat generated by the heat sink. If the lower cover deforms due to heat, there may be a gap between the rice cooker body and the lid unit.
In some cases, the lid could not be closed.

For this reason, some models have a resin flange integrally formed on the lower cover (for example,
No. 132659 (Refer to the micro film of Utility Model Application Publication No. 58-37814)), but even with such a structure, the lower cover could not be sufficiently reinforced.

In particular, the lid unit generally has a steam passage formed therein, and the strength around the passage is not particularly strong.

<Purpose of the invention> This invention was made in view of the above problems, and it is lightweight, has sufficient strength, absorbs errors during molding, and
The object of the present invention is to provide a lid unit for a rice cooker that is designed to prevent thermal deformation.

<Means and effects for solving the problem> The rice cooker lid unit of this invention to achieve the above object includes an upper cover 81 and a lower cover 82 made of synthetic resin, and a heat insulating material storage space between the two covers. In the upper cover 81 and the lower cover 82, a steam passage is formed that vertically penetrates both covers, and the steam passage is formed on the lower surface side of the upper cover 81 or the lower cover 8.
An upper cover 8 is provided on at least one of the upper surfaces of 2.
One or more reinforcing plates 82b, 81a, 81e formed separately from the lower cover 82 are attached at positions that cross the center of the lid unit and reach the outer periphery, and the reinforcing plates 82b, 81a ,81
Upper cover 81 or lower cover 82 depending on e.
It is characterized by a central part that is curved so as to protrude upward.

With this configuration, the sides of the steam passages, which have particularly weak strength, in the upper cover 81 or the lower cover 82 are reinforced with reinforcing plates 82b, 81a, and 81e that cross the center of the lid unit and extend to the outer periphery. , can provide sufficient strength to the lid unit. In addition, reinforcing plates 82b, 81a,
Since the center part of the upper cover 81 or the lower cover 82 is curved so as to protrude upward, the upper cover 81 or the lower cover 82
Errors during molding can be absorbed by attaching the reinforcing plate, and deformation of the upper cover 81 or the lower cover 82 due to heat during cooking can be prevented. As a result, the adhesion of the lid unit including the upper cover 81 or the lower cover 82 to the rice cooker body can be improved.

<Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples.

FIG. 6 is a longitudinal sectional view showing the multifunctional rice cooker, in which a lid unit 7 is connected to the upper part of the casing 1 so as to be openable and closable. More specifically, the casing 1 has a cylindrical side member 2 whose upper part is made of a thin metal plate, and a bottom member 3 whose lower part is made of a rigid resin. An inner pot storage container 5 is attached to the inside of the casing 1, and an inner pot 6 is housed inside the inner pot storage container 5 in a suspended manner and can be taken out.

More specifically, the casing 1 has a bottom member 3 made of synthetic resin attached to the lower end of a side member 2 having a cylindrical shape made of metal, and an upper member 11 made of synthetic resin attached to the upper end. There is.

The bottom member 3 is formed into a deep dish shape that can cover substantially the lower half of the inner pot storage container 5. By recessing a predetermined position near the periphery of the bottom upward, a power supply component accommodating recess 33 for accommodating a power supply component 34 such as a transformer is formed, and a predetermined position on the upper rising portion is recessed inward. By doing so, a control board accommodating recess 35 is formed to accommodate a control board 36 on which a microcomputer chip or the like is mounted. A cover 37 is attached to the power supply board accommodation recess 33 with screws to prevent the power supply components 34 in the housed state from being exposed to the outside. A cover 38 that prevents the control board 36 from being exposed to the outside and also serves as an operating pouch is attached with screws. Note that 39 is an opening for inserting a power cord formed at a predetermined position in the power supply component housing recess 33, and 30 is a cord reel.

The side member 2 is a thin metal plate formed into a cylindrical shape, and the lower end edge and the upper end edge are curved inward so as to have a substantially cylindrical shape to form a ring portion 2.
1 and 22 are formed so as to be engaged with the annular groove 23 of the bottom member 3 and the annular groove 24 of the upper member 11 in a water-tight manner, and the engaged state can be secured by screws 25.

The upper member 11 is made of synthetic resin and has a substantially ring-shaped overall shape, and has a support portion 12 on the upper surface that supports the upper end flange portion 51 of the inner pot storage container 5 in a suspended manner. , upper end flange 61 of the inner pot 6
A support part 13 that supports the holder in a hanging manner is formed concentrically with the support part 13 . A shoulder portion 14 is formed at a predetermined position to support the lid unit 7 in a vertically movable manner, and an engaging portion is positioned directly opposite the shoulder portion 14 to hold the lid unit 7 in a closed state. It has 15.

The inner pot storage container 5 is formed in a shape capable of accommodating the inner pot 6, and has a center sensor 53 attached thereto by penetrating the center of the bottom surface, and a rice cooking container that surrounds the center sensor 53. A heater 54 is installed. The upper end edge portion is curved outward to form an upper end flange portion 51 that can be engaged with the support portion 12 . Note that 55 is a heat shield plate, and a support plate 56 for testing insulation resistance is attached to a predetermined position and brought into contact with the casing of the cord reel 30. 58 is a heat insulating heater attached to a predetermined position on the side surface of the inner pot storage container 5, 59 is a temperature fuse, and 50 is a heat insulating material that surrounds almost the entire side surface of the inner pot storage container 5.

The lid unit 7 has a handle 71 on the top and a heat sink 72 on the bottom.
Then, the lid heater 7 is placed at a predetermined position on the upper surface of the heat sink 72.
4 is attached, and a steam packing 73 is attached to the outer periphery of the heat sink plate 72 so that it can come into contact with the flange portion 61 of the inner pot 6. Further, a one-touch pin 75 is attached to the center of the heat dissipation plate 72, and a one-touch packing 77 attached to the center of the lid plate 76 that contacts the stepped portion 62 of the inner pot 6 is detachably attached to the one-touch pin 75. ing. Note that 78 is an operating lever for opening and closing the lid unit 7, 79 is a lead wire for applying voltage to the lid heater 74, and 70 is a hinge cover that is force-fitted into a predetermined position of the side member 2. It is.

1 to 5 show the upper member 11 and the lid unit 7.
FIG.

The lid unit 7 has an upper cover 81 and a lower cover 82 made of synthetic resin to form a heat insulating material storage space, and a steam passage 81d (see FIG. (see B) is formed, and the heat dissipation plate 72 is attached to the lower surface of the lower cover 82. A flange 83 is provided at a predetermined position on the peripheral edge of the upper cover to prevent the lower cover 82 from coming off, and a plurality of tapered ribs 83a are formed on the lower surface of the flange 83. This makes it easy to force fit. In addition, the above lower cover 8
2 is screwed to the upper cover 81 at a predetermined location, and the heat dissipation plate 72 is screwed to the lower cover 82. moreover,
As shown in FIG. 7, a reinforcing plate 82b is attached which has a hole 82c that engages with a protrusion 82a formed on the upper surface side of the lower cover 82 (protrusion 82a).
When the reinforcing plate 82b and the lower cover 82 remain engaged with each other, the reinforcing plate 82b and the lower cover 82 are set to be separated by a predetermined distance. By screwing the bolt 82e into the screw hole formed in the center of the reinforcing plate 82b, the lower cover 82
is curved so that the center part protrudes upward to absorb errors during molding, prevent deformation due to heat during cooking, and improve adhesion. The reinforcing plates 82b extend across the center of the lower cover 82 to reach the outer periphery thereof, and are attached in parallel and facing each other at positions sandwiching the steam passage 81d. still,
A recess 82 formed at a predetermined position of the reinforcing plate 82b
d is a clearance for the positioning member of the lid heater 74.

A pair of base parts 85a and 85b are formed at a predetermined position of the upper cover 81, sandwiching a protrusion 84 formed protrudingly at a predetermined position of the upper member 11, and a bolt passing through the base part 85a. An insertion hole 85c is formed, and the bolt insertion hole 85c is formed at a predetermined position of the base 85b.
A bolt insertion hole 85d is formed on the extension of the bolt insertion hole 85d. One end opens inward of the upper cover 81 at a predetermined position of the base parts 85a, 8b, and the other end opens into the bolt insertion hole 85, respectively.
reinforcing member insertion hole 85e, which communicates with c, 85d;
85f is formed. In addition, the base 85
As shown in FIGS. 5A to 5C, a substantially cylindrical rib 86 is formed in correspondence with the intermediate position of 85a and 85b, and a screw hole 8 is formed in the center of the rib 86.
6a, and three protrusions 86b are formed to surround the hole 86a.

Further, as shown in FIGS. 4A and 4B, the reinforcing member 87 is attached to a predetermined position of the substantially rectangular metal plate with a substantially T
A letter-shaped hole 87a is formed, and a hanging plate portion is formed continuously on one side of the metal plate,
By bending both ends of the hanging plate portion at right angles, protruding plate portions 87b and 87c are formed which are inserted into the reinforcing member insertion holes 85e and 85f, and are directly opposed to the bolt insertion hole 85c of the protruding plate portion 87b. A large diameter hole 87d into which the bolt 88 can be loosely inserted is formed at a predetermined position, and the protruding plate portion 87c
A screw hole 87e into which a bolt 88 can be screwed is formed at a predetermined position directly facing the bolt insertion hole 85d. Therefore, by installing the reinforcing member 87 so that the T-shaped hole 87a engages with the protrusion 86b, the large diameter hole 87d and the bolt insertion hole 8
5c, the screw hole 87e and the bolt insertion hole 85d are communicated with each other.

Incidentally, as shown in FIG. 8, the lead wires 79 are routed in a crosswise manner by the ribs 86, and the lead wires 79 are routed in a crosswise manner by the ribs 86.
By bending 9 in the twisting direction, the life of the lead wire 79 can be extended. Specifically, in the case of the conventional product without crossing, the lead wires 79 were disconnected after about 20,000 opening/closing operations, but in the case of crossing as described above, the lead wires 79 broke after about 50,000 opening/closing operations. The lead wire 79 did not break even after the opening and closing operations were performed ten thousand times.

In addition, FIG. 9A is a developed view of the inner pot 6, in which water level display scales 63 for white rice are formed at positions facing each other, and are approximately 90 degrees apart from the water level display scale 67 for white rice. A water amount display scale 64 for porridge and a water amount display scale 65 for brown rice and rice are formed at the positions. Therefore, the scales 63 for displaying the amount of water required when cooking white rice, which is the most frequently used method, are positioned facing each other as shown in FIG. It can be prevented.

In the rice cooker having the above configuration, after manufacturing the casing 1 and the lid unit 7 according to the required steps, the protruding portion 84 formed protrudingly at a predetermined position on the upper member 11 is sandwiched between the pair of base portions 85a and 85b. With the upper cover 81 attached in this state, the bolt insertion hole 8 is inserted from the bolt insertion hole 85c passing through the base 85a to the large diameter hole 87d and the bolt insertion hole 8 passing through the protrusion 84.
4a and the bolt insertion hole 85d, and screws into the screw hole 87e, the lid unit 7 can be connected to the casing 1 so that it can be opened and closed manually. Note that when performing the above work, it is not possible to check from the outside how the reinforcing member 87 is attached to the upper cover 81;
a is engaged with the protrusion 86b of the rib 86, the large diameter hole 87d and the screw hole 87e directly face the bolt insertion holes 85c and 85d, respectively. The bolt 88 can be inserted and screwed.

In the lid unit 7 connected so as to be openable and closable as described above, even when the upper cover 81 is made of synthetic resin and the bolt insertion portion is formed into a thin wall, the reinforcing member 87 can effectively Since it is reinforced and has increased strength, it is possible to prevent the lid unit 7 from deforming even if it is opened and closed frequently.

The structure of the reinforcing member 87 is as follows:
As shown in the figure, it is possible to form a circular hole 87f instead of the T-shaped hole 87a.

Further, instead of attaching the reinforcing plate 82b to the lower cover 82, it may be arranged as shown in FIG. 11. In other words, a pair of reinforcing plates 81 are provided on the upper cover 81.
Install a. In this case, the reinforcing plate 81a
is disposed at a position that extends across the center of the lid unit to reach the outer periphery and sandwich the steam passage 81d. Then, both ends of the reinforcing plate 81a are screwed, and the upper protrusion 81b formed at the center of both reinforcing plates 81a and a pair of ribs 81c formed at the lower surface of the center of the upper cover 81 are brought into pressure contact with each other. By doing this, the center part protrudes upward and both sides are curved so as to be pushed downward, which absorbs errors during molding, prevents deformation due to heat during cooking, and improves adhesion. Good too. still,
81d is a pressure regulating section.

Furthermore, instead of the pair of steam reinforcing plates 81a, one wide reinforcing plate 81 is used as shown in FIG.
e may be fixed to the upper cover 81 with screws.

<Effects of the invention> As described above, this invention has one or more wires formed separately from the upper cover 81 or the lower cover 82 on at least one of the lower surface side of the upper cover 81 or the upper surface side of the lower cover 82. reinforcing plate 82
b, 81a, 81e are attached at positions that cross the center of the lid unit and reach the outer periphery, and the upper cover 81 is supported by the reinforcing plates 82b, 81a, 81e.
Alternatively, since the center portion of the lower cover 82 is curved so as to protrude upward, errors in molding the upper cover 81 or the lower cover 82 may be caused by the reinforcing plate 82.
b, 81a, and 81e. That is, the upper cover 81 or the lower cover 8
By attaching the reinforcing plates 82b, 81a, 81e to 2, the upper cover 81 or the lower cover 82 is curved so that its center portion protrudes upward along the reinforcing plates 82b, 81a, 81e,
Even if an error occurs during molding, the error is absorbed by the above-mentioned curvature. As a result, the upper cover 81 or the lower cover 82 can be precisely defined in a predetermined shape. Moreover, the reinforcing plate 82b,
Since 81a and 81e are attached, thermal deformation of the upper cover 81 and lower cover 82 due to heat during rice cooking is effectively prevented. Furthermore, the upper cover 81
Since the lid unit including the lower cover 82 is resistant to thermal deformation, good adhesion of the lid unit to the rice cooker body can be maintained.

Furthermore, since hot steam passes through the steam passage formed in the lid unit, the upper cover 81 and the lower cover 82 are easily deformed.
Reinforcement plates 82b, 81a, 81 are placed next to the steam passage.
Since the lid unit 82 is provided, the upper cover 81 and the lower cover 82 will not be deformed even if steam passes through the steam passage, and the lid unit can be used satisfactorily for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical sectional view showing the attached state of the lid unit (Fig. 6 - line enlarged sectional view), Fig. 2 is an enlarged sectional view taken along - line in Fig. 6, and Fig. 3 is a - line enlarged sectional view in Fig. 6. 4 is a diagram showing the reinforcing member, FIG. 5 is a diagram showing the ribs, FIG. 6 is a schematic vertical sectional view showing the internal structure of the rice cooker, and FIG. 7 is a plane showing the installation state of the reinforcing plate. Figure 8 is a diagram showing how the lead wires are routed, Figure 9 is a diagram showing the inner pot, Figure 10 is a perspective view showing another configuration of the reinforcing member, and Figure 11 is a reinforcing plate for the upper cover. FIG. 12 is a diagram showing how a reinforcing plate of another configuration is attached to the upper cover. DESCRIPTION OF SYMBOLS 1... Casing, 6... Inner pot, 7... Lid unit, 87... Reinforcement member, 87e... Screw hole, 8
8...Bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] In a rice cooker lid unit comprising an upper cover 81 and a lower cover 82 made of synthetic resin, with a heat insulating material storage space formed between the two covers, the upper cover 81 and the lower cover 82 A steam passage is formed that vertically penetrates both covers, and the lower surface side of the upper cover 81 or the lower cover 8
An upper cover 8 is provided on at least one of the upper surfaces of 2.
One or more reinforcing plates 82b, 81a, 81e formed separately from the lower cover 82 are attached at positions that cross the center of the lid unit and reach the outer periphery, and the reinforcing plates 82b, 81a ,81
Upper cover 81 or lower cover 82 depending on e.
A lid unit for a rice cooker, characterized in that the central part of the lid unit is curved so as to protrude upward.