WO2008013367A1

WO2008013367A1 - A manufacturing method of cookpot

Info

Publication number: WO2008013367A1
Application number: PCT/KR2007/003283
Authority: WO
Inventors: Jong-Oh Lee
Original assignee: Aic Co.; Cheongsu Engineering Co.
Priority date: 2006-07-25
Filing date: 2007-07-06
Publication date: 2008-01-31
Also published as: KR100834413B1; KR20080009790A

Abstract

The present invention relates a method for manufacturing a cookpot comprising a contour portion that forms the contour of the container body and at least an embedded portion that is embedded inside said contour portion and has heat conductivity lower than that of said contour portion. The method comprises a step for molding and manufacturing said embedded portion; a step for postioning said embedded portion inside the mold for container manufacture; a step for casting the container body by injecting into said mold the melt of the contour portion material having heat conductivity higher than that of said embedded portion; a step for removing the mold of said cast container body; and a step for trimming and finishing said contour portion of the container body released from the mold.

Description

Description A MANUFACTURING METHOD OF COOKPOT

Technical Field

[1] The present invention relates to a method for manufacturing a cookpot provided with a contour portion having relatively high heat conductivity and an embedded portion having lower heat conductivity than that of the contour portion, whereby food can be heated up quickly during cooking and heat can be preserved for a long time so that energy can be saved. Background Art

[2] In general, the body of a cookpot is made of a single metal, so the extent of food heating varies with the characteristics of the heat transfer of the metal composing the body. Namely, if the heat transfer of the metal is fast, food can be heated up quickly but also gets cold quickly; conversely if the heat transfer is slow, food can be kept from getting cold for a long time, but the disadvantage is that food is heated up slowly. Fig. 1 is a sectional view showing the construction of a conventional cookpot of the prior art. As shown in Fig. 1, the conventional cookpot comprises a container body 100 usually made of a single metal and a handle G which is fitted on the container body 100 and is easily held by hand.

[3] Meanwhile, a body of a cookpot made of ceramic or stone is also disclosed.

Ceramic or stone, whose raw material is cheap, keeps heat for a long time, so keeps food from getting cold, is strong against heat, and can be made with various colors, but has disadvantages that the speed of heat transfer is slow, so much energy is consumed for heating, that it is hard but is easily broken, and that it is hard to repair so it has to be disposed of as waste even for a small defect.

[4] Relating to this, Korea Utility Model Laid-Open No. 1996-19951 disclosed a container in which a ceramic plate is fixed and attached on the container heating bottom portion to prevent burning or soup overflowing. This container has a complicated structure and many processes of manufacturing, so the problem is that it has a high cost of manufacture and has inconveniences in maintenance.

[5] Also, in improving on the conventional problems, it had limitations as it considers only the bottom portion for container heating. Disclosure of Invention

Technical Problem

[6] To solve the above mentioned problems of the prior art, it is an object of the present invention to provide a method for manufacturing a cookpot, which comprises a contour portion that forms the contour of the container body and at least an embedded portion that is embedded in and encircling the inside of the flank of the contour portion, so that food can be heated up quickly during cooking and heat can also be preserved for a long time so that energy can be saved.

[7] Another object of the present invention is to provide a method for manufacturing a cookpot which further comprises a conductive plate made of conductive material that is attached to the outer bottom surface of the contour portion and allows induction of a magnetic field. Technical Solution

[8] To achieve the above objects, there is provided a method for manufacturing a cookpot comprising a contour portion that forms the contour of the container body and at least an embedded portion that is embedded inside said contour portion and has heat conductivity lower than that of said contour portion, the method comprising: a step for molding and manufacturing said embedded portion; a step for postioning said embedded portion inside the mold for container manufacture; a step for casting the container body by injecting into said mold the melt of the contour portion material having heat conductivity higher than that of said embedded portion; a step for removing the mold of said cast container body; and a step for trimming and finishing said contour portion of the container body released from the mold.

[9] In addition, in the method for manufacturing a cookpot of the present invention, the cookpot further comprises a conductive plate that is attached to the outer bottom surface of said contour portion and made of conductive material that allows induction of a magnetic field.

Advantageous Effects

[10] According to the method for manufacturing a cookpot of the present invention, it is provided with a contour portion having relatively high heat conductivity and an embedded portion having low heat conductivity, so food can be heated up quickly during cooking and heat can be preserved for a long time so that energy can be saved. Brief Description of the Drawings

[11] These and other features, aspects, and advantages of preferred embodiments of the present invention will be more fully described in the following detailed description, taken in conjunction with the accompanying drawings. In the drawings:

[12] Fig. 1 is a sectional view showing the construction of a cookpot of the prior art;

[13] Fig. 2 is a sectional view showing the construction of a cookpot according to a first embodiment of the present invention;

[14] Fig. 3 is a flow chart showing the method for manufacturing a cookpot according to the first embodiment of the present invention;

[15] Fig. 4 is a perspective view according to an embodiment of the embedded portion in a cookpot of the present invention;

[16] Fig. 5 is a sectional view showing the construction of a cookpot according to a second embodiment of the present invention;

[17] Fig. 6 is a sectional view showing the construction of a cookpot according to a third embodiment of the present invention;

[18] Fig. 7 is a perspective view of the embedded portion and an enlarged view of one portion of a cookpot according to a fourth embodiment of the present invention; and

[19] Fig. 8 is a perspective view according to another embodiment of the embedded portion in the cookpot according to a fifth embodiment of the present invention. Best Mode for Carrying Out the Invention

[20] First embodiment

[21] Fig. 2 is a sectional view showing the construction of a cookpot according to a first embodiment of the present invention. As shown in Fig. 2, the cookpot according to the first embodiment of the present invention comprises a contour portion 100 that forms the contour of the container body and an embedded portion 200 that is embedded in and encircling the inside of the flank of the contour portion 100 and has heat conductivity lower than that of the contour portion.

[22] If the contour portion 100 is made of metal or nonferrous metal, it is preferable that the embedded portion 200 is made of nonmetal with heat conductivity lower than material such as ceramic, loess or stone; if the contour portion 200 is made of aluminum, silver or nonferrous metal, it is preferable that the embedded portion 200 is made of metal with heat conductivity lower than material such as cast iron, tin or brass. Namely, the contour portion 100 is characterized by being made of metal or nonferrous metal with heat conductivity higher than that of the embedded portion 200.

[23] For reference, the heat conductivity of aluminum is 175 kcal/mh, that of silver 350 kcal/mh, that of cast iron 41 kcal/mh, that of tin 55 cal/mh, and that of brass 85 kcal/ mh.

[24] Fig. 3 is a flow chart showing the method for manufacturing a cookpot according to the first embodiment of the present invention. As shown in Fig. 3, the cookpot according to the first embodiment of the present invention comprises a contour portion 100 that forms the contour of the container body according to the first embodiment of the present invention and at least an embedded portion 200 that is embedded in and encircling the inside of the flank of the contour portion 100 and has heat conductivity lower than that of the contour portion. The method for manufacturing a cookpot according to the present invention comprises a step SlOO for molding and manufacturing an embedded portion 200; a step S200 for positioning the embedded portion 200 inside the mold for container manufacture; a step S300 for casting the container body by injecting into the mold the melt of the contour portion 100 material having heat conductivity higher than that of the embedded portion 200; a step S400 for removing the mold of the cast container body; and a step S500 for trimming and finishing the contour portion 100 of the container body released from the mold.

[25] The step SlOO for molding and manufacturing the embedded portion 200 includes a step for manufacturing a conductive plate 300, and the step S200 for positioning the embedded portion 200 inside the mold for container manufacture further comprises a step for resting the conductive plate 300 inside the mold for container manufacture. Therefore, it is possible to also manufacture a cookpot for an induction range.

[26] Fig. 4 is a perspective view according to an embodiment of the embedded portion in a cookpot of the present invention. As described above, in the cookpot of the present invention, the embedded portion 200 is embedded in and encircling the inside of the flank of the contour portion 100 that forms the contour of the container body and has heat conductivity lower than that of the contour portion 100. Mode for the Invention

[27] Second embodiment

[28] Fig. 5 is a sectional view showing the construction of a cookpot according to a second embodiment of the present invention. As shown in Fig. 5, the cookpot according to the second embodiment of the present invention comprises a contour portion 100 that forms the contour of the container body, and an embedded portion 200, which is not only provided in and encircling the inside of the flank of the contour portion 100 but is also provided in the inside of the bottom of the contour portion 100, and has heat conductivity lower than that of the contour portion.

[29] It is preferable that the embedded portion 200 provided in the inside of the bottom of the contour portion 100 has through holes or gaps formed therein to make the casting of the contour portion easy and not to obstruct heat transfer from the bottom. Casting hereinafter referred to in the present invention includes not only standard casting but also die casting.

[30] Third embodiment

[31] Fig. 6 is a sectional view showing the construction of a cookpot according to a third embodiment of the present invention. As shown in Fig. 6 a cookpot according to the third embodiment of the present invention comprises a contour portion 100 that froms the contour of the container body, an embedded portion 200 that is embedded inside the contour portion 100 and has heat conductivity lower than that of the contour portion, and a conductive plate 300, which is made of conductive material that is attached to the outer bottom surface of the contour portion 100 and allows induction of a magnetic field. [32] Usually, in the cookpot for an induction range, the container body is made of relatively light dielectric metal material for lightweightness, for example, aluminum or stainless steel, and a conductive plate, which is made of conductive metal material that allows induction of a magnetic field from induction range, for example, iron or alloy containing iron, is installed monolithically on the bottom surface of the container body for heating the content. The conductive plate 300 in the present invention makes it possible to also be used with an induction range.

[33] Fourth embodiment

[34] Fig. 7 is a perspective view of the embedded portion and an enlarged view of one portion of a cookpot according to a fourth embodiment of the present invention. As shown in Fig. 7, the embedded portion in the cookpot of this embodiment of the present invention can have embossments formed thereon to enhance binding force by increasing the contact area with the melt of the contour portion material during casting of the contour portion 100.

[35] Fifth embodiment

[36] Fig. 8 is a perspective view according to another embodiment of the embedded portion of a cookpot of the present invention.

[37] As shown in Fig. 8, the embedded portion 200 in the cookpot of the present invention can have through holes H or gaps formed from the inner surface toward the outer surface to increase castability by facilitating the flow of the melt of the contour portion material during casting of the contour portion 100. As mentioned in Fig. 5, it is preferable that they are formed also in the embedded portion 200 provided inside the bottom of the contour portion 100.

[38] Although the present invention has been described in connection with the exemplary embodiments illustrated in the drawings, it is only illustrative. It will be understood by those skilled in the art that various modifications and equivalents can be made to the present invention. Therefore, the true technical scope of the present invention should be defined by the appended claims. Industrial Applicability

[39] As described above, according to the method for manufacturing a cookpot of the present invention, it is provided with a contour portion having relatively high heat conductivity and an embedded portion having low heat conductivity, so food can be heated up quickly during cooking and heat can be preserved for a long time so that energy can be saved.

[40]

[41]

Claims

[1] A method for manufacturing a cookpot comprising a contour portion 100 that forms the contour of the container body and at least an embedded portion 200 that is embedded inside said contour portion 100 and has heat conductivity lower than that of said contour portion, the method comprising: a step SlOO for molding and manufacturing said embedded portion 200; a step S200 for postioning said embedded portion inside the mold for container manufacture; a step S300 for casting the container body by injecting into said mold the melt of the contour portion 100 material having heat conductivity higher than that of said embedded portion 200; a step S400 for removing the mold of said cast container body; and a step S500 for trimming and finishing said contour portion 100 of the container body released from the mold. [2] The method for manufacturing a cookpot of Claim 1, wherein if said contour portion 100 is made of metal or nonferrous metal, said embedded portion is made of nonmetal with heat conductivity lower than that of said contour portion 100, such as ceramic, loess or stone. [3] The method for manufacturing a cookpot of Claim 1, wherein if said contour portion 100 is made of aluminum, silver or nonferrous metal, said embedded portion 200 is made of metal with heat conductivity lower than that of said contour portion, such as cast iron or brass. [4] The method for manufacturing a cookpot of Claim 1, wherein said embedded portion 200 is also provided inside the bottom of said contour portion 100. [5] The method for manufacturing a cookpot of Claim 1, further comprising a step of attaching a conductive plate 300 to the outer bottom surface of said contour portion 100, wherein the conductive plate is made of conductive material that allows induction of a magnetic field. [6] The method for manufacturing a cookpot of Claim 1, further comprising a step of forming embossments on said embedded portion 200. [7] The method for manufacturing a cookpot of Claim 1, further comprising a step of forming through holes or gaps on said embedded portion from the inner surface toward the outer surface thereof.