JPH08266411A - Lid packing device - Google Patents

Abstract

PURPOSE: To provide a lid packing device which can prevent a lid packing from coming off, and always can keep the sealability to a container such as pot, etc., favorable. CONSTITUTION: This lid packing device is equipped with a lid packing 30 integrally having an annular engaging part 31, and a seal part 32 Whose cross section is approx. a U-shape and which extends from the lower part of the engaging part 31 such as overhanging to the outside, and a lid body 16 which has a recessed part 20 on the lower surface. Then, the engaging part 31 of the lid packing 30 is engaged with the recessed part 20 of the lid body 16 to attach the lid packing 30 to the lower surface of the lid body 16. Then, at a lower part of the engaging part 31 of the lid packing 30, a supporting tongue piece 33 which approx. horizontally extends to the inside of the engaging part 31 is integrally formed, and the supporting tongue piece 33 is brought into contact with the lower surface of the lid body 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid packing device used for a rice cooker, a boiling pot and a heat retaining pot.

[0002]

2. Description of the Related Art In a rice cooker, for example, a lid is attached to an upper end of a rice cooker so as to be vertically rotatable, and is formed into an annular shape by an elastic body such as silicone rubber or fluororubber on the inner surface of the lid. The lid packing is attached.

A pot for cooking rice is stored as a container in the body of the rice cooker, and the lid packing is elastically brought into close contact with the upper edge of the pot so that the pot is sealed. There is.

A conventional lid packing 1 is shown in FIGS.
The lid packing 1 includes an annular locking portion 2 that is locked to a mounting portion of the lid body, and a cross-section that extends from the lower portion of the locking portion 2 to the outside thereof. It has a character-shaped seal part 3 integrally. And the sealing portion 3
As shown in FIG. 5, the extension piece 4 extends substantially horizontally from the lower portion of the locking portion 2 toward the outside thereof, and is bent substantially vertically downward from the tip edge of the extension piece 4. The support piece 5 is composed of a support piece 5 and a lip piece 6 extending obliquely downward from the lower edge of the support piece 5 toward the inside of the locking portion 2.

In this lid packing 1, as shown in FIG. 6, a locking portion 2 is locked to a lower surface of a lid body 7 of a rice cooker, for example, and a lip piece 6 of a sealing portion 3 is closed according to the closing of the lid body 7.
Is elastically abutted on the upper edge of the pan 8 as a container in the rice cooker to seal the inside of the pan 8.

By the way, such a lid packing 1 is manufactured by a method using an extrusion molding machine. That is,
The extrusion molding machine is provided with a molding die having a discharge port corresponding to the cross-sectional shape of the lid packing 1. The material of the lid packing 1 such as silicone rubber or fluororubber is sequentially extruded from the discharge port of the molding die. A long string-like object having the same sectional shape as the lid packing 1 is formed.

Next, the string-like material is cut into a predetermined length,
After this cutting, both end surfaces of the string-like material are joined with an adhesive or the like to manufacture the annular lid packing 1 as shown in FIG. The portion a shown in FIG. 4 is the joining portion of the string-like material. Then, the locking portion 2 is locked to the mounting portion of the lid body 7 while the annular lid packing 1 is slightly tensioned in the circumferential direction.

As described above, the method of manufacturing the lid packing 1 by using the extrusion molding machine has advantages that it can be manufactured easily and efficiently as compared with injection molding, and that the material used does not cause loss.

[0009]

However, a lid packing in which a long string-shaped material is molded by an extrusion molding machine, the string-shaped material is cut into a predetermined length, and both ends thereof are joined with an adhesive or the like. In No. 1, a tensile stress along the circumferential direction is generated in the outer peripheral part of the lid packing 1 and a compressive stress along the peripheral direction is generated in the inner peripheral part due to the joining of the both ends.

When the locking portion 2 is locked and attached to the lower surface of the lid body 7 while applying tension to the lid packing 1, the tensile stress of the outer peripheral portion of the lid packing 1 and the compressive stress of the inner peripheral portion thereof are caused. Is further increased, as shown by the chain line in FIG. 6, the seal portion 3 is deformed so as to fall inside the lid packing 1, and as a result, after the lid packing 1 is attached to the lid body 1, the lid body 1 is attached. The locking part 2 may come off from the lid body 7 due to an impact caused by opening and closing of the lid 7, and the lid packing 1 may drop off from the lower surface of the lid body 7. Further, the deformation of the seal portion 3 may cause the pan 8
The airtightness will be reduced.

The present invention has been made by paying attention to such a point, and an object of the present invention is to reliably prevent the lid packing from coming off and to always keep a good sealing property for a container such as a pot. It is to provide a lid packing device capable of

[0012]

In order to achieve such an object, the present invention has an annular locking portion and a substantially U-shaped cross section extending from the lower portion of the locking portion to the outside thereof. A lid packing made of an elastic material integrally having a sheet-shaped seal portion, and a lid body having a mounting portion on the lower surface capable of locking the locking portion of the lid packing. In a lid packing device in which a stopper is attached to an attaching portion of the lid and attached to a lower surface of the lid, the lid packing is provided at a lower portion of the engaging portion of the lid packing so as to be substantially horizontal toward an inner side of the engaging portion. The extending supporting tongue piece is integrally formed, and the supporting tongue piece is brought into contact with the lower surface of the lid body.

[0013]

[Function] In the lid packing attached to the lid, tensile stress is generated in the outer peripheral portion and compressive stress is generated in the inner peripheral portion,
Due to the difference between the tensile stress of the outer peripheral part and the compressive stress of the inner peripheral part, the seal part tries to deform so as to fall inward of the lid packing. The supporting tongue extending substantially horizontally toward the side is integrally formed, and the supporting tongue is in contact with the lower surface of the lid body, so that the deforming force that causes the seal portion to fall inward of the lid packing is generated. It is received by the supporting tongue and its deformation is prevented.

Therefore, the seal portion is always held in a proper posture, so that the lid packing is surely prevented from falling off, and the seal portion is properly brought into close contact with the upper edge of the container when the lid body is closed. Is securely sealed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a cross-sectional view of the rice cooker, in which 10 is a rice cooker main body made of a synthetic resin such as polypropylene. Inside the rice cooker main body 10 is a bottomed cylindrical inner frame 11 made of metal such as aluminum. The rice cooking heater 12 and the temperature sensor 1 are provided on the bottom of the inner frame 11.
3 is provided, and a cord-shaped body heater 14 is attached to the upper portion of the outer periphery of the inner frame 11.

A pot 15 as a container is removably housed in the inner frame 11, and a lid body 16 is vertically rotated on an upper portion of the rice cooker body 10 via a lid hinge (not shown). It is possible to install.

The lid 16 includes an upper plate 17 made of synthetic resin such as polypropylene, and a lower plate 18 made of synthetic resin such as polypropylene attached to the lower surface of the upper plate 17.
The lower plate 18 is composed of a lower plate 19 attached to the lower surface of the lower plate 18 and made of metal such as aluminum.

The lower plate 18 is formed with a continuous annular recess 20 along the circumferential direction thereof, and a rising piece 21 is integrally formed on the peripheral edge of the lower plate 19 so as to form the recess 20 and the rising end. The piece 21 constitutes an attachment portion of the lid packing 30. Reference numeral 22 is a cord-shaped lid heater attached to the upper surface of the lower plate 19.

FIG. 2 shows the entire appearance of the lid packing 30, and FIG. 3 shows a partial appearance thereof. The lid packing 30 is formed in an annular shape by an elastic body such as silicone rubber or fluororubber. ing. The lid packing 30 includes an annular locking portion 31 and a seal portion 3 extending from the lower portion of the locking portion 31 to the outside thereof.
2 and a supporting tongue piece 33 extending substantially horizontally from the lower portion of the locking portion 31 toward the inner side thereof. The cross-sectional shape of the seal portion 32 is a substantially U shape including a V shape and a U shape.

The seal portion 32 will be described in more detail. The seal portion 32 has an extending piece 34 extending substantially horizontally from the lower portion of the locking portion 31 toward the outer side thereof, and a tip edge of the extending piece 34. From the lower end edge of the support piece 35 and a lip piece 36 extending obliquely downward from the lower end edge of the support piece 35 toward the inside of the locking portion 31. A mounting groove 37 is formed in the engaging portion 31.

As shown in FIG. 1, a rising piece 21 on the peripheral edge of the lower surface plate 19 is press-fitted into the mounting groove 37 of the locking portion 31, and in this state, the locking portion 31 covers the lid body 16. The lid packing 30 is attached to the lower surface of the lid 16 by being fitted and locked in the recess 20 of the lower plate 18. The supporting tongue piece 33 of the lid packing 30 is in contact with the lower surface plate 19 of the lid body 16.

The manufacturing process of the lid packing 30 will be described. An extrusion molding machine equipped with a molding die having the same discharge opening as the cross-sectional shape of the lid packing 30 is used, and a material such as silicone rubber or fluororubber is used for the molding die. Are sequentially extruded from the discharge port to form a long string-like object having the same cross section as the cross section of the lid packing 30.

Next, this string-like material is cut into a length that is slightly shorter than the entire circumferential length of the recess 20 in the lid body 16, and both end surfaces of the cut string-like object are joined with a silicone adhesive or the like. As shown in FIG. 2, an annular lid packing 30 is manufactured. The portion a shown in FIG. 2 is the joining portion of the string-like material.

Then, as shown in FIG. 1, the bottom plate 1 is applied to the lid packing 30 while applying a slight tension in the circumferential direction.
It is attached to the lower surface of the lid body 16 via the rising piece 21 of 9, and the supporting tongue piece 33 of the lid packing 30 is brought into contact with the lower surface of the lower surface plate 19.

Lid packing 3 attached in this way
At 0, tensile stress is generated in the outer peripheral portion and compressive stress is generated in the inner peripheral portion, and the seal portion 32 collapses inward of the lid packing 30 due to the difference between the tensile stress in the outer peripheral portion and the compressive stress in the inner peripheral portion. Try to transform like.

However, in this lid packing 30,
A supporting tongue piece 33 extending substantially horizontally from the lower portion of the locking portion 31 toward the inner side thereof is integrally formed.
Is in contact with the lower surface of the lower plate 19, so that the deforming force of the seal portion 32 tending to fall inward of the lid packing 30 is received by the supporting tongue piece 33, and its deformation is prevented. Is held in a proper posture.

Therefore, the lid packing 30 is surely prevented from falling off, and the lip piece 36 of the sealing portion 32 is properly brought into close contact with the upper edge of the pot 15 when the lid 16 is closed, so that the pot 15 is securely sealed. To be done.

It is needless to say that the lid packing device of the present invention is not limited to the case of being applied to a rice cooker, but can be applied to a cooker such as an electric pan or a boiling water retaining pot.

[0029]

As described above, according to the present invention,
The deforming force of the seal part in the lid packing can be supported by the tongue piece and its deformation can be reliably prevented. Therefore, the seal part is always kept in an appropriate posture to prevent the lid packing from falling off, and At the time of closing, the seal portion can be properly brought into close contact with the upper edge of the container to reliably seal the container.

[Brief description of drawings]

FIG. 1 is a sectional view of a lid packing device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an outer appearance of the entire lid packing in the lid packing device.

FIG. 3 is a perspective view showing an appearance of a part of the lid packing in the lid packing device.

FIG. 4 is a perspective view showing an overall appearance of a conventional lid packing.

FIG. 5 is a perspective view showing an appearance of a part of the lid packing.

FIG. 6 is a cross-sectional view showing a state in which the lid packing is attached to the lid of the rice cooker.

[Explanation of symbols]

 16 ... Lid body 20 ... Recessed portion (mounting portion) 30 ... Lid packing 31 ... Locking portion 32 ... Sealing portion 33 ... Supporting tongue piece

Claims (1)

[Claims] 1. A lid packing made of an elastic material, which integrally has an annular locking portion and a seal portion having a substantially U-shaped cross section which extends from the lower portion of the locking portion to the outside thereof.
A lid body having a mounting portion capable of locking the locking portion of the lid packing on a lower surface, and the lid packing is configured by locking the locking portion to the mounting portion of the lid body. In the lid packing device attached to the lower surface, a support tongue piece that extends substantially horizontally toward the inner side of the locking portion is integrally formed at the lower portion of the locking portion of the lid packing,
A lid packing device characterized in that the supporting tongue is brought into contact with the lower surface of the lid.