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
  • A47J27/00—Cooking-vessels
  • A47J27/02—Cooking-vessels with enlarged heating surfaces
  • A47J27/022—Cooking-vessels with enlarged heating surfaces with enlarged bottom
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49908—Joining by deforming

Definitions

• Kitchen utensils consisting of a container comprising an inner plate of stainless steel and an outer aluminum plate are known.
• the aluminum plate is deformable under the action of the heat source and the aluminum does not have the electromagnetic properties allowing this type of utensil to be heated by induction.
• FR 2 801 485 describes a cooking utensil composed of a receptacle comprising a bottom composed of an aluminum interlayer plate and a perforated stainless steel outer plate, said plate is embedded in the plate of aluminum so that the perforations of the outer plate are filled by the aluminum of the spacer plate.
• the aluminum plate is reinforced by the outer plate, the utensil allows induction heating.
• the thermal conductivity of the cooking utensil is not optimized because the aluminum is disposed only on the bottom of the container.
• the invention aims to remedy these problems by proposing a cooking utensil usable on a gas stove as well as on an induction plate, having a very good thermal conductivity for optimal use on a gas stove and being relatively simple to achieve.
• the invention provides a cooking utensil comprising a container and a stainless steel bottom having perforations; said bottom being embedded in the outside of the base of the container of in such a way that the perforations are filled with the material of the container, the cooking utensil being characterized in that the wall of the container is formed by superposition of a layer of stainless steel and an aluminum layer, the aluminum filling the perforations of the bottom.
• the utensil has a stainless steel magnetic bottom for use on induction systems and aluminum container that fills the perforations allows good heat conduction when used on a gas stove.
• the aluminum layer is disposed on the entire container for rapidly spreading heat to the entire container.
• the stainless steel layer of the container allows good conservation of heat inside the container.
• FIG. 1 represents a cross-sectional view of a cooking utensil according to the invention
• FIG. 2 shows a cross-sectional view of a cooking utensil according to the invention, illustrating more precisely the bottom of this utensil;
• FIG. 3 shows a bottom view of such a utensil
• FIGS. 4 to 6 show views of the three successive annular zones.
• the cooking utensil 1 comprises a receptacle 2 and a bottom 3 made of stainless steel having perforations 6.
• the wall of the container 2 is formed by superposition of a layer of stainless steel 4 and an aluminum layer 5.
• the embodiment of the container is made by simultaneous stamping of the two layers 4, 5.
• the aluminum layer 5 forms the outside of the wall of the container 2 and the stainless steel layer 4 forms the inside of the container wall 2.
• the aluminum layer 5 has a thickness of between 3 and 5 mm and the thickness of the stainless steel layer 4 is between 0.5 and 1 mm.
• the stainless steel layer 4 of the container 2 is polished.
• the bottom 3 of stainless steel is affixed to the outer base of the container 2 by a hot press exerting a pressure of 2000 tons.
• the aluminum fills the perforations 6 of the bottom 3 and the thermal conductivity of the cooking utensil 1 is improved.
• the aluminum is flush with perforations 6.
• the bottom 3 has for example a section of 200 mm and a thickness of between 0.5 and 1 mm.
• the bottom 3 has a hollow central zone 7. Thus, the spinning effect that occurs in case of deformation of the bottom 3 is avoided.
• the central zone 7 is stamped, forming a depression of about 1 mm, on a section of 50 mm. This depression is formed by stamping flowing aluminum to the peripheral areas. The stamping of a central zone 7 makes it possible to prevent bottom blistering because air remains trapped between the container 2 and the bottom 3.
• the diameter of the central zone 7 stamped is equal to about a quarter of the diameter of the bottom 3.
• the central zone 7 is surrounded by a perforated zone comprising round perforations and elliptical perforations.
• the diameter of the round perforations is less than 0.015 times the diameter of the bottom.
• the particular shape and distribution of the perforations can give rise to many variations guided mainly by aesthetic considerations.
• the diameter of the largest perforation is less than 0.8% of the bottom surface.
• the first annular zone 8 surrounding the central zone 7 has essentially round perforations, with a diameter of 2.6 mm each, and elliptical perforations whose minor axis is about 2.3 mm and the major axis about 10 mm.
• This first annular zone 8 comprises 77 round perforations and 7 elliptical perforations. It has an outer section of 84 mm. The density of perforations is about 10.77% in this first zone.
• this annular zone has an outer diameter of between 0.4 and 0.5 times the diameter of the bottom.
• the median annular zone 9 has a perforation density of about 24.77%. It comprises 3 concentric circular rows each comprising 7 elliptical perforations of increasing size. Between two angular sectors of three radially aligned elliptical perforations, this median zone 9 has a set of 7 round perforations of 2.6 mm in section.
• This median zone 9 therefore comprises 21 elliptical perforations and 49 round perforations.
• the elliptical perforations have small axes respectively measuring 3.2 mm, 3.7 mm and 3.8 mm and major axes respectively measuring 23 mm, 30 mm and 36 mm.
• the median annular zone 9 has an outer diameter of between 0.7 and 0.8 times the diameter of the bottom 3.
• the third annular zone 8 also has 3 concentric circular rows each comprising 7 elliptic perforations of increasing size between two angular sectors of three radially aligned elliptical perforations.
• the elliptical perforations have small axes measuring respectively 4 mm, 4.2 mm and 4.2 mm and major axes respectively measuring 42 mm, 47 mm and 50 mm.
• the perforation density of this peripheral zone 8 is about 21%.
• the density of perforations is greater than 15%.
• the density of perforations is greater than 20% and less than 30%.
• the density of perforations is between 5 and 15% in an annular band 10 surrounding the central zone, between 20 and 30% in the median annular band 9 and between 15 and 25% in the outer annular band 8.
• the maximum density is of the order of 25% in the median annular zone 9.
• the bottom 3 according to the present invention is particularly suitable for heating by various types of stoves: - gas stove, producing a flame whose ridge substantially corresponds to the median annular zone 9, when the fire is well adjusted;
• induction plate exciting the bottom 3 of stainless steel magnetic
• the distribution of the perforations 6 is homogeneous, in particular no zone of more than 10 or 15 mm in section is devoid of perforation 6.
• density of perforations is the ratio between the cumulative area of the perforations 6 formed in a reference zone, and the total area of this reference zone. The density of perforations 6 is zero when the reference zone comprises no perforation 6, and 100% if the reference zone corresponds entirely to a perforation 6.
• the reference zone corresponds to the total surface of the bottom of the utensil 1
• the density of perforations 6 then corresponds to the ratio between the cumulative surface of the perforations 6, and the total surface of the bottom 3.
• aluminum is understood to mean pure aluminum or an aluminum alloy usually used to produce cooking utensils because of its thermal characteristics.

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

Applications Claiming Priority (2)

Publications (1)

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• 2005
  • 2005-07-12 FR FR0552166A patent/FR2888486B1/fr not_active Expired - Fee Related
• 2006
  • 2006-07-12 EP EP06778871A patent/EP1919334A1/de not_active Withdrawn
  • 2006-07-12 US US11/995,485 patent/US20090127267A1/en not_active Abandoned
  • 2006-07-12 WO PCT/FR2006/001706 patent/WO2007006978A1/fr active Application Filing

Non-Patent Citations (1)

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