JPS61272011A - Production of packing for inner lid of rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing a packing for an inner lid of a rice cooker.

[Technical Background of the Invention] Conventionally, in a rice cooker, as shown in FIG. 6, an inner lid 2 that closes an opening 11 has a curled portion 3 curved upward in an arc shape on a peripheral edge thereof. A ring-shaped packing 4 made of silicone rubber is removably attached to the curled portion 3 by fitting, and this packing 4 is in contact with the mounting stage 5 of the upper opening of the pot 1. It is designed to maintain airtightness.

[Problems with the Background Art] However, in this conventional configuration, when cleaning the inner lid 2, the packing 4 must be removed to also clean the curled portion 3, and the packing 4 must be reattached after cleaning. In addition, the packing 4 tends to deteriorate because the packing 4 has to be installed and removed every time cleaning is done, and the packing 4 is often reinstalled. Since it is likely to be incomplete, airtightness is often insufficient and steam leaks, and there is also the problem that the packing 4 comes off when the inner 12 is handled.

[Object of the Invention] The present invention has been made in view of the above points, and its object is to provide excellent cleaning workability, extend the life of the packing,
A packing for the inner lid of a rice cooker that maintains sufficient airtightness, eliminates the problem of the packing coming off, and also eliminates the need to attach the packing to the inner lid, reducing man-hours. To provide a manufacturing method.

[Summary of the Invention] The present invention provides a method in which a plurality of through holes are arranged in a row in the inner lid so as to be arranged along the mounting position of the packing, and the packing is injection molded by filling material through the through holes. It is characterized in that a plurality of stopper parts having diameters larger than the through-holes are integrally formed on the upper surface of the inner lid at parts corresponding to the through-holes in the packing. This is a method for producing a frame-shaped packing for sealing between the pot and the inner lid.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In FIGS. 1 and 2, 6 is the rice cooker main body, which consists of an outer case 7, an inner case 8, a heat insulating material 9 disposed on both cases 7 and 8111, and an outer case 7.
The bottom case 10 is attached to the lower part of the bottom case 10. Reference numeral 11 denotes an outer cover rotatably mounted on the top opening of the rice cooker main body 6 to open and close it, and two steam venting vibes 12, for example, are attached to this outer cover. Reference numeral 13 denotes a steel piece housed in the inner case 8, and a mounting step part 14 is formed at the upper opening of the steel piece. 15 is an inner lid, which will be described below with reference to FIGS. 3 and 4. That is, the reference numeral 16 denotes the main part of the inner lid which is made of aluminum and has a circular shape, and around the main part of the inner lid there are formed a plurality of through holes 17 in a frame shape, for example, an annular shape.
are installed in a row. 18 is a packing made of a heat-resistant material such as silicone rubber, which is manufactured by the method described below.
A seal portion 18a formed in an annular shape on the lower surface of the inner lid main portion 16
and a plurality of hemispherical stopper portions 18b, which are located on the upper surface of the inner lid main portion 16 and formed in a portion corresponding to the through hole 17 and have a diameter larger than that of the through hole 17. Here, the lower surface of the seal portion 18a is formed to be in airtight contact with the mounting step portion 14 of the pot 13. Further, a through hole 19 is previously formed in the inner lid main portion 16 in correspondence with the steam venting vibe 12, and the through hole 19 has a through hole 2 in the center.
A bushing 20 made of a heat-resistant elastic material such as silicone rubber having a diameter of 0a is attached. Inner lid 15 configured in this way
is removably attached to the outer lid 11 by elastically fitting the through hole 20a of the bushing 20 into the small diameter portion 12a at the lower end of the steam venting vibe 12.

Although not shown, an electric heater for heating the pot 13 is provided at the inner bottom of the inner case 8, and a temperature detection mechanism is provided for controlling the electric heater in the rice cooker main body 6. It is being

Next, a method for manufacturing the packing 18 will be described with reference to FIG. Reference numeral 21 denotes an upper mold having a cavity shape corresponding to the stopper portion 18b, and a gate 22 for filling material is provided on the upper mold. 23 is the seal portion 18a
This is a lower mold having a cavity shape corresponding to . Then, the inner lid main part 16 is held between the upper mold 21 and the lower mold 23, and the material such as silicone rubber is applied to the gate 2 while applying pressure.
When the material is filled into the cavity from 2, the stopper part 18b and the seal part 18a are integrally formed by filling the material through the through hole 17, and the packing 18 is injection molded.

When the top opening of the rice cooker main body 6 is opened by rotating the outer lid 11 downward, the inner portion 1115 is inserted into the mounting stage 14 of the steel 13 through the packing 18. It is placed and supported, and at this time, the steam release vibe 12
Since the inner lid 15 is pressed through the bushing 20, the packing 18 elastically comes into close contact with the mounting step 14, thereby maintaining airtightness.

According to this embodiment having such a configuration, the following effects can be obtained. That is, since the stopper part 18b and the seal part 18a of the packing 18 are integrally formed by injection molding by filling material through the through hole 17, there is no need to remove and reinstall the packing 18 when cleaning the inner lid 15. The cleaning workability is excellent, and since it is not necessary to attach and remove the packing 18 every time cleaning is performed, the life of the packing 18 can be extended. Furthermore, since there is no need to reattach the packing 18, incomplete attachment of the packing 18 will not result in a situation, and sufficient airtightness can be maintained. Lid main part 1
There is no longer any problem of falling outside of 6. In particular, since a gate is provided above the stopper part 18b of the packing 18 for injection molding, there is no possibility of burrs occurring on the lower surface of the seal part 18a due to injection molding, and the seal part 18a and the mounting step part 14 are The airtightness between the two is further improved. Moreover, since the stopper part 18b is formed on the upper surface of the inner lid main part 16, even if an external force is applied to the packing 18, the packing 18
is prevented from coming off from the inner lid 15. In addition, since the packing 18 is attached to the inner lid main portion 16 during molding, the number of man-hours can be reduced accordingly. Furthermore, in order to prevent the packing 18 from coming off, the stopper part 18b is formed on the back side of the inner lid main part 16 when the packing 18 is molded. The packing 18 will not be damaged as would be the case if it is inserted from the inside, and from this point of view as well, the life of the packing 18 can be extended.

In the above embodiment, the packing 18 is formed into an annular shape, but the packing 18 may be formed into a frame shape instead.

In addition, the present invention is not limited only to the embodiments described above and shown in the drawings, and it goes without saying that the present invention can be implemented with appropriate modifications within the scope of the invention.

[Effects of the Invention] As is clear from the above description, the present invention molds a frame-shaped packing by injection molding by filling material through a plurality of through holes arranged in a row in the inner cover, and Since the packing is integrally formed with a plurality of stopper parts having a diameter larger than the through hole, the cleaning workability is excellent, the life of the packing can be extended, the airtightness is sufficiently maintained, and the packing is prevented from coming off. There are no problems with this, and furthermore, it has many excellent effects such as being able to eliminate the trouble of attaching the packing to the inner lid and reducing the number of man-hours.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention, where Figure 1 is a longitudinal side view, Figure 2 is a side view of the entire rice cooker, and Figure 3 is a side view of the entire rice cooker.
The figure is an enlarged longitudinal sectional side view of the main part, FIGS. 4(a) and 4(b) are a plan view and a bottom view of the inner cover, respectively, and FIG. 5 is an enlarged longitudinal sectional side view showing the manufacturing method. Further, FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional configuration. In the drawing, 6 is the rice cooker body, 13 is the pot, 15 is the inner lid, 16
17 is a main portion of the inner lid, 17 is a through hole, 18 is a packing, 18b is a stopper portion, and 22 is a gate. 1st Figure 1j Il! 13 Figure 1ζ (a) ('b)
Figure 4 Fufu

Claims (1)

[Claims] 1. In a method for manufacturing a frame-shaped packing provided around the lower surface of an inner lid that is attached to an opening on the upper surface of a pot and for sealing between the pot and the inner lid, the inner A plurality of through holes are arranged in a row in the lid so as to be arranged along the mounting position of the packing, and the packing is formed by injection molding by filling material through the through holes, and at this time, the packing is from the through hole located on the upper surface of the inner lid in a corresponding part with each through hole in,
A method of manufacturing a packing for an inner lid of a rice cooker, characterized in that a plurality of large-diameter stopper parts are integrally formed.