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WO2017203428A1 - Cooking vessel for induction cooking stoves - Google Patents

Cooking vessel for induction cooking stoves Download PDF

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Publication number
WO2017203428A1
WO2017203428A1 PCT/IB2017/053033 IB2017053033W WO2017203428A1 WO 2017203428 A1 WO2017203428 A1 WO 2017203428A1 IB 2017053033 W IB2017053033 W IB 2017053033W WO 2017203428 A1 WO2017203428 A1 WO 2017203428A1
Authority
WO
WIPO (PCT)
Prior art keywords
insert
points
cooking vessel
flat
thickness
Prior art date
Application number
PCT/IB2017/053033
Other languages
French (fr)
Inventor
Giovanni Sollo
Original Assignee
Pensofal International S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pensofal International S.P.A. filed Critical Pensofal International S.P.A.
Publication of WO2017203428A1 publication Critical patent/WO2017203428A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/002—Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for cooking-vessels

Definitions

  • the present invention relates to a cooking vessel for induction cooking stoves, such as a pot or a pan.
  • this type of cooking vessel comprises a bottom portion, made of relatively soft metallic material, and a flat insert or plate, arranged on the outer surface of the vessel at such bottom, made of relatively hard material .
  • the flat insert in turn, comprises a plurality of points projecting from a surface thereof intended to be adhered to said bottom, so that these points stick in the thickness of the bottom made of soft material.
  • the points are distributed around the edge of holes which are obtained in the thickness of the insert; thus they result to be forcedly penetrated through the thickness of the vessel bottom so that insert and bottom are made integral one another.
  • the vessel bottom portion is covered by a coating, in particular an anti-adherent resin, by way of example a PTFE-based resin.
  • the flat insert which is applied to the bottom instead results from a process of punching the above-mentioned holes which determined, thanks to the particular shape of the punches, a number of points which can be three or four .
  • the insert is subsequently forced, by the action of a press, within the material thereof the vessel bottom portion is formed, so that said points penetrate through the bottom thickness and anchor firmly.
  • the insert carries out the function of reinforcing the bottom by stiffening it but, within the induction cooking, it has the purpose of generating heat by electric conduction.
  • the insert is made of ferromagnetic material, like a ferritic steel.
  • the strict adhesion between insert and bottom allows the generated heat to be transferred by conduction inside the vessel bottom portion, not only by the flat surfaces in contact therebetween, but even by the points which penetrate the material of the bottom portion and which make to increase as a whole the surface of thermal exchange between the insert and the bottom itself.
  • this perfect flatness has to be kept for a long period, notwithstanding the several heating and cooling cycles thereto the vessel is subjected which forcedly determine thermal deformations of different entity in the materials forming the bottom of the vessel and the insert.
  • the technical problem underlying the present invention is to provide a cooking vessel, in particular a pot or a pan, for the induction cooking allowing to obviate the drawback mentioned with reference to the known art.
  • a vessel as specified above wherein the flat insert is limited by a first edge which, in turn, has a first projecting rim, formed by a wall projecting perpendicularly to the plane defined by the insert, and still it comprises a circular opening, centred with respect to the insert, having a second edge which has a second projecting rim, formed by a wall projecting perpendicularly to the plane defined by the insert, said first and second rim being forcedly penetrated through the thickness of the bottom by pressing together with said points.
  • the main advantage of the vessel according to the present invention lies in the fact of allowing to obtain and keep a perfect flatness of the bottom, together with a firm connection between insert and bottom for a long working period .
  • figure 1 shows a cooking vessel, in particular a pan, seen with reference to the bottom thereof;
  • figure 2 shows an insert applied to the pan of figure i
  • figure 3 shows a detail in particular section of the insert of figure 2; • figure 4 shows an insert variant.
  • a cooking vessel according to the invention was designated as a whole with 1 which, in the illustrated case, is constituted by a pan equipped with connection 2 for connecting to a handle 3.
  • the vessel 1 comprises an edge 4 and a circular bottom 5, thereon a flat insert 6, circular too, is applied.
  • the circular bottom 5 of the vessel 1 is made of relatively soft metallic material, for example aluminium, having a given first thickness, whereas the coating layer 6 is made of a relatively hard material, such as for example steel of ferritic type, and it is equipped with a respective second thickness S (figure 3) .
  • the insert 6 is equipped with holes 7 distributed on the whole surface thereof 9, and it is limited by a first circular edge which, in turn, has a first projecting rim 11, formed by a wall projecting perpendicularly to the plane defined by the insert 6.
  • the insert 6 still comprises a circular opening 12, centred with respect to the insert 6, having a second circular edge which, in turn, has a second projecting rim 13, formed by a wall projecting perpendicularly to the plane defined by the insert 6.
  • the holes 7 are implemented by means of a punching procedure which determines the formation of a plurality of points 8 projecting from a surface 9 of the insert 6, opposite to the outer surface 10 therefrom the (not represented) punch penetrates and intended to be adhered to the bottom 5 of the vessel 1.
  • a first variant provides that the hole 7 has the shape of a square, which for example can be obtained with a chamfered punch so as to form a vertex of the point 8 with substantially trapezoidal shape;
  • a second variant provides a square hole obtained with an acuminated punch which, for this reason, produces a vertex of the point 8 with substantially triangular shape and with pointed apex;
  • a third variant is similar to that of the first variant and it provides a triangular hole, obtained with a punch with triangular section, and vertexes of the point 8 with chamfered apex.
  • the vertexes of the points 8 form, from the apex thereof to the plane of the insert 6, a duct with substantially conical shape, with cross section increasing from the apexes to the plane.
  • the plan section of the duct with conical shape that is the base surface thereof, can have a polygonal, for example square or triangular, shape, as explained previously.
  • the opening of such duct with conical shape can be minimum, therefore the vertexes of the points, with the surface of the flat insert 6, form an angle equal to 90° or higher, preferably higher than 90°.
  • the points 8 result to be arranged around each hole 7 and project from the surface 9 with a predetermined height H (figure 3) .
  • the flat insert 6 is applied to the bottom 5 of the cooking vessel 1 by making the points 8 to penetrate through the thickness of the bottom portion 5 which, as illustrated above, is made of a softer metallic material than the one thereof the insert 6 is made.
  • the application of the layer 6 to the bottom portion 5 preferably is performed by means of a press or a hammer. After compression, the adhesion of the flat insert 6 on the bottom portion 5 is induced and, in this phase, a particular behaviour of the bottom material is noted which, being softer than that of the points 8 and being inserted in a duct with growing section, has the tendency to expand inside each hole 7 by creating a sort of rivet which keeps anchored the coating layer to the bottom. This effect is determined by the shape of the conical duct limited by the projecting vertexes of the points.
  • the vertexes of the points are subjected to a slight tilting with respect to the original position thereof, induced by the shifting and by the compression of the material constituting the bottom which is pierced by the points. This contributes to implement a safe anchoring for grasping.
  • the grasping consists in bending the end of each vertex of point 8 which moves away from the original position according thereto the points were made to penetrate through said bottom thickness. Thanks to the rims 11, 13, any possible displacement of the flat insert 6, with respect to the original penetration direction, is compensated. This is valid even and especially for the cyclic thermal deformations accompanying the whole working life of the vessel 1.
  • the height H of the points 8, obtained after the formation of the holes 7, is comprised between 1.5 and 1.9 mm and preferably is 1.7 mm, measured before the layer 7 results to be applied to the bottom portion 6.
  • the diameter of each hole 7 has a size comprised between 2.4 and 2,6 mm and preferably 2.4 mm.
  • said holes 7 are distributed on circumferences concentric therebetween and with respect to the circular edge of said coating layer.
  • the holes have the maximum density on the surface of the insert 6.
  • the holes are arranged according to three peripheries 14 spaced apart therebetween: one adjacent to the first rim 11, one adjacent to the second rim 13 and a third periphery in median position.
  • additional holes are arranged on radial lines. It is to be meant that the radial lines can wholly cross the insert from a rim to the other one, or they can be shorter and extend only from a periphery to an adjacent another one. The number of peripheries can vary.
  • the overall thickness of the cooking vessel bottom is comprised between 1.6 mm and 1.0 mm .
  • the width of the opening 12 will be adapted to the width of the insert 6 and to that of the bottom 5 thereto the insert will be applied.
  • the diameter of the circular opening does not exceed 60 mm, and for example it could be 55 mm for pots or pans having large sizes (for example diameters of 24 ⁇ 32 cm) and 35 ⁇ 40 mm for pots and pans having small sizes (for example diameters of 16 ⁇ 24 cm) .
  • the height of the rims 11, 13 will be in the same intervals of the points 8 and it will be equal or greater than the height of the points 8.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Cookers (AREA)

Abstract

A cooking vessel (1), such a pot or a pan, particularly suitable to be used on induction cooking stoves, allows to obtain and keep the perfect flatness of the bottom, together with a firm connection between insert and bottom for a long operating period, and it comprises a bottom (5), made of relatively soft metal material, and a flat insert (6), made of relatively hard material, said flat insert (6) being provided with a plurality of points (8) projecting from a surface thereof (9) adhered to said bottom (5), the points (8) being distributed around holes (7) obtained through the flat insert (6) and being forcedly penetrated in the thickness of the bottom (5) by pressing, wherein the flat insert (6) is limited by a first edge which, in turn, has a first projecting rim (11), formed by a wall projecting perpendicularly to the plane defined by the insert (6), and still it comprises a circular opening (12), centred with respect to the insert (6), having a second edge which has a second projecting rim (13), formed by a wall projecting perpendicularly to the plane defined by the insert (6), said first and second rims (11, 13) being forcedly penetrated in the thickness of the bottom (5) by pressing together with said points (8).

Description

Cooking vessel for induction cooking stoves
Description
The present invention relates to a cooking vessel for induction cooking stoves, such as a pot or a pan.
Generally, this type of cooking vessel comprises a bottom portion, made of relatively soft metallic material, and a flat insert or plate, arranged on the outer surface of the vessel at such bottom, made of relatively hard material .
The flat insert, in turn, comprises a plurality of points projecting from a surface thereof intended to be adhered to said bottom, so that these points stick in the thickness of the bottom made of soft material.
The points are distributed around the edge of holes which are obtained in the thickness of the insert; thus they result to be forcedly penetrated through the thickness of the vessel bottom so that insert and bottom are made integral one another.
This kind of vessel with an insert of the above-described type is known for example from European patent No. 1, 052, 055.
International application No. WO 2006/126,848 Al describes another example of pot bottom equipped with a metallic insert, wherein the insert has the shape of a plate with a plurality of branched slots and not pointed projections which project from the solid portions of the plate, intended to be forced without deforming in the thickness of bottom of the pot or pan.
In this example of known art, the vessel bottom portion is covered by a coating, in particular an anti-adherent resin, by way of example a PTFE-based resin.
The flat insert which is applied to the bottom instead results from a process of punching the above-mentioned holes which determined, thanks to the particular shape of the punches, a number of points which can be three or four .
The insert is subsequently forced, by the action of a press, within the material thereof the vessel bottom portion is formed, so that said points penetrate through the bottom thickness and anchor firmly.
The insert carries out the function of reinforcing the bottom by stiffening it but, within the induction cooking, it has the purpose of generating heat by electric conduction. To this purpose, the insert is made of ferromagnetic material, like a ferritic steel.
The strict adhesion between insert and bottom allows the generated heat to be transferred by conduction inside the vessel bottom portion, not only by the flat surfaces in contact therebetween, but even by the points which penetrate the material of the bottom portion and which make to increase as a whole the surface of thermal exchange between the insert and the bottom itself.
In the practical implementation of the insert adhesion processes by means of press, however, it was found that the application of such insert on the vessel bottom portion made of softer material, such as for example aluminium, in the finished product determines irregularities to the plane therewith the vessel is rested on the induction device plate.
As it is known, since the induction cooking stoves, to the purpose of a good energy performance, request the use of vessels equipped with a bottom the outer surface thereof could adhere with the maximum possible precision to the plane of the plate of the induction device, possible differences in level can reduce considerably the energy effectiveness of this cooking type.
It is further meant that this perfect flatness has to be kept for a long period, notwithstanding the several heating and cooling cycles thereto the vessel is subjected which forcedly determine thermal deformations of different entity in the materials forming the bottom of the vessel and the insert.
The technical problem underlying the present invention is to provide a cooking vessel, in particular a pot or a pan, for the induction cooking allowing to obviate the drawback mentioned with reference to the known art.
Such problem is solved by a vessel as specified above wherein the flat insert is limited by a first edge which, in turn, has a first projecting rim, formed by a wall projecting perpendicularly to the plane defined by the insert, and still it comprises a circular opening, centred with respect to the insert, having a second edge which has a second projecting rim, formed by a wall projecting perpendicularly to the plane defined by the insert, said first and second rim being forcedly penetrated through the thickness of the bottom by pressing together with said points.
The main advantage of the vessel according to the present invention lies in the fact of allowing to obtain and keep a perfect flatness of the bottom, together with a firm connection between insert and bottom for a long working period .
The present invention will be described hereinafter according to a preferred embodiment example, provided by way of example and not with limitative purposes with reference to the enclosed drawings wherein:
• figure 1 shows a cooking vessel, in particular a pan, seen with reference to the bottom thereof;
• figure 2 shows an insert applied to the pan of figure i;
• figure 3 shows a detail in particular section of the insert of figure 2; • figure 4 shows an insert variant.
By referring to the figures, a cooking vessel according to the invention was designated as a whole with 1 which, in the illustrated case, is constituted by a pan equipped with connection 2 for connecting to a handle 3.
The vessel 1 comprises an edge 4 and a circular bottom 5, thereon a flat insert 6, circular too, is applied.
The circular bottom 5 of the vessel 1 is made of relatively soft metallic material, for example aluminium, having a given first thickness, whereas the coating layer 6 is made of a relatively hard material, such as for example steel of ferritic type, and it is equipped with a respective second thickness S (figure 3) .
The insert 6 is equipped with holes 7 distributed on the whole surface thereof 9, and it is limited by a first circular edge which, in turn, has a first projecting rim 11, formed by a wall projecting perpendicularly to the plane defined by the insert 6.
The insert 6 still comprises a circular opening 12, centred with respect to the insert 6, having a second circular edge which, in turn, has a second projecting rim 13, formed by a wall projecting perpendicularly to the plane defined by the insert 6.
The holes 7 are implemented by means of a punching procedure which determines the formation of a plurality of points 8 projecting from a surface 9 of the insert 6, opposite to the outer surface 10 therefrom the (not represented) punch penetrates and intended to be adhered to the bottom 5 of the vessel 1.
Conveniently, it can be noted that there could be several embodiments of the plurality of points 8. For example a first variant provides that the hole 7 has the shape of a square, which for example can be obtained with a chamfered punch so as to form a vertex of the point 8 with substantially trapezoidal shape; a second variant provides a square hole obtained with an acuminated punch which, for this reason, produces a vertex of the point 8 with substantially triangular shape and with pointed apex; a third variant is similar to that of the first variant and it provides a triangular hole, obtained with a punch with triangular section, and vertexes of the point 8 with chamfered apex.
In each case, the vertexes of the points 8 form, from the apex thereof to the plane of the insert 6, a duct with substantially conical shape, with cross section increasing from the apexes to the plane. The plan section of the duct with conical shape, that is the base surface thereof, can have a polygonal, for example square or triangular, shape, as explained previously.
The opening of such duct with conical shape can be minimum, therefore the vertexes of the points, with the surface of the flat insert 6, form an angle equal to 90° or higher, preferably higher than 90°.
The points 8 result to be arranged around each hole 7 and project from the surface 9 with a predetermined height H (figure 3) .
The flat insert 6 is applied to the bottom 5 of the cooking vessel 1 by making the points 8 to penetrate through the thickness of the bottom portion 5 which, as illustrated above, is made of a softer metallic material than the one thereof the insert 6 is made.
The application of the layer 6 to the bottom portion 5 preferably is performed by means of a press or a hammer. After compression, the adhesion of the flat insert 6 on the bottom portion 5 is induced and, in this phase, a particular behaviour of the bottom material is noted which, being softer than that of the points 8 and being inserted in a duct with growing section, has the tendency to expand inside each hole 7 by creating a sort of rivet which keeps anchored the coating layer to the bottom. This effect is determined by the shape of the conical duct limited by the projecting vertexes of the points.
Moreover, the vertexes of the points are subjected to a slight tilting with respect to the original position thereof, induced by the shifting and by the compression of the material constituting the bottom which is pierced by the points. This contributes to implement a safe anchoring for grasping.
The penetration of the first and the second rim 11, 13, delimiting an area wherein the points 8 of the insert 6 are pierced in the bottom 5, contributes to the grasping too. This limitation prevents the points, which cannot be identical one with respect to the other one and symmetrical with respect to the central axis of the insert 6, from determining even minimum discontinuities in the insert 6.
In fact, in reality the grasping consists in bending the end of each vertex of point 8 which moves away from the original position according thereto the points were made to penetrate through said bottom thickness. Thanks to the rims 11, 13, any possible displacement of the flat insert 6, with respect to the original penetration direction, is compensated. This is valid even and especially for the cyclic thermal deformations accompanying the whole working life of the vessel 1.
In the present embodiment example, the height H of the points 8, obtained after the formation of the holes 7, is comprised between 1.5 and 1.9 mm and preferably is 1.7 mm, measured before the layer 7 results to be applied to the bottom portion 6.
According to the invention, the diameter of each hole 7 has a size comprised between 2.4 and 2,6 mm and preferably 2.4 mm.
Still according to the invention, said holes 7 are distributed on circumferences concentric therebetween and with respect to the circular edge of said coating layer.
In the example of figure 2 the holes have the maximum density on the surface of the insert 6. In the example of figure 4, the holes are arranged according to three peripheries 14 spaced apart therebetween: one adjacent to the first rim 11, one adjacent to the second rim 13 and a third periphery in median position. Furthermore, additional holes are arranged on radial lines. It is to be meant that the radial lines can wholly cross the insert from a rim to the other one, or they can be shorter and extend only from a periphery to an adjacent another one. The number of peripheries can vary.
The overall thickness of the cooking vessel bottom, according to the invention, is comprised between 1.6 mm and 1.0 mm .
The width of the opening 12 will be adapted to the width of the insert 6 and to that of the bottom 5 thereto the insert will be applied.
However, the diameter of the circular opening does not exceed 60 mm, and for example it could be 55 mm for pots or pans having large sizes (for example diameters of 24 ÷ 32 cm) and 35 ÷ 40 mm for pots and pans having small sizes (for example diameters of 16 ÷ 24 cm) .
Advantageously, indeed thanks to the fact of having adopted points 8 having a height H comprised between 1.5 and 1.9 mm, it is possible to use bottoms of vessels equipped with a thickness equal to the lower limit shown above which is sensibly smaller than the thickness of the vessel bottom usually used in the state of art (for example a vessel having a bottom equal to 3 mm) .
The height of the rims 11, 13 will be in the same intervals of the points 8 and it will be equal or greater than the height of the points 8. To the above-described cooking vessel a person skilled in the art, in order to satisfy additional and contingent needs, could introduce several additional modifications and variants, however all comprised within the protective scope of the present invention, as defined by the enclosed claims.

Claims

1. A cooking vessel (1) , such as a pot or a pan, particularly suitable to be used on induction cooking stoves, comprising a bottom (5), made of relatively soft material, and a flat insert (6), made of relatively hard material, said flat insert (6) being provided with a plurality of points (8) projecting from a surface thereof (9) adhered to said bottom (5), the points (8) being distributed around holes (7) obtained through the flat insert (6) and forcedly being penetrated through the thickness of the bottom (5) by pressing, wherein:
the flat insert (6) is limited by a first edge which, in turn, has a first projecting rim (11), formed by a wall projecting perpendicularly to the plane defined by the insert (6), and still it comprises a circular opening (12), centred with respect to the insert (6), having a second edge which has a second projecting rim (13), formed by a wall projecting perpendicularly to the plane defined by the insert (6), said first and second rims (11, 13) being forcedly penetrated through the thickness of the bottom (5) by pressing together with said points (8) .
2. The cooking vessel according to claim 1, wherein the points (8) and the rims (11, 13), before the forced insertion thereof in the thickness of the insert (6), project from the surface (9) of the insert (6) having a height comprised between 1.5 and 1.9 mm.
3. The cooking vessel according to claim 1, wherein said first and second edge are circular.
4. The cooking vessel according to claim 1, wherein said holes (7) are distributed on peripheries concentric therebetween and with respect to the circular edge of said flat insert (6) .
5. The cooking vessel according to claim 1, wherein the diameter of said holes (7) is comprised between 2.4 and
2.6 mm .
6. The cooking vessel according to claim 1, wherein the vertexes of said points (8) form, from the apex thereof to the surface of the flat insert (6), a substantially cone-like shaped duct, with cross section increasing from the apexes to the surface of the flat insert (6) .
PCT/IB2017/053033 2016-05-23 2017-05-23 Cooking vessel for induction cooking stoves WO2017203428A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUA2016A003689A ITUA20163689A1 (en) 2016-05-23 2016-05-23 Cooking container for induction cooktops
IT102016000052713 2016-05-23

Publications (1)

Publication Number Publication Date
WO2017203428A1 true WO2017203428A1 (en) 2017-11-30

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ID=56940265

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/053033 WO2017203428A1 (en) 2016-05-23 2017-05-23 Cooking vessel for induction cooking stoves

Country Status (2)

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IT (1) ITUA20163689A1 (en)
WO (1) WO2017203428A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109757969A (en) * 2019-03-12 2019-05-17 胡拥军 Lightweight Energy Saving Pans
CN118372041A (en) * 2024-04-24 2024-07-23 浙江钱江机器人有限公司 A robot production line for cookware

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1052055A1 (en) * 1999-05-04 2000-11-15 Società Italiana Pentole S.p.A. Process for the manufacture of cooking vessels and vessel obtained according to such process
WO2006126848A1 (en) * 2005-05-26 2006-11-30 Natoyan.Co., Ltd. Cooking vessel for induction ranges and manufacturing method thereof
WO2016013825A1 (en) * 2014-07-22 2016-01-28 오정근 Dual gas and induction cooking apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1052055A1 (en) * 1999-05-04 2000-11-15 Società Italiana Pentole S.p.A. Process for the manufacture of cooking vessels and vessel obtained according to such process
WO2006126848A1 (en) * 2005-05-26 2006-11-30 Natoyan.Co., Ltd. Cooking vessel for induction ranges and manufacturing method thereof
WO2016013825A1 (en) * 2014-07-22 2016-01-28 오정근 Dual gas and induction cooking apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109757969A (en) * 2019-03-12 2019-05-17 胡拥军 Lightweight Energy Saving Pans
CN118372041A (en) * 2024-04-24 2024-07-23 浙江钱江机器人有限公司 A robot production line for cookware

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