LU81731A1 - COMPOSITE SHEET COOKER AND METHOD FOR THE PRODUCTION THEREOF - Google Patents

Description

• V

D. 5o.767

--n. ¥ j | GRAND-DUCHÉ DE LUXEMBOURG

Brevet N "R j J Ο- I

you 27 .... septeinbr.e .. "ia.7 £ (Tgfe Monsieur le Ministre

de l’Économie Nationale et des Classes Moyennes Service de la Propriété Industrielle LUXEMBOURG

Demande de Brevet d’invention I. Requête ...... La-soclété ..... dite: ..... ARDAL · · ..OG. SUNNDAL VERK a „s., ..... S ^ rkedalsseien ....... (i> ...... 6r ..... à-OSLO ..... 3, ... ..Norvège * ..... représentée. Par ... MonsieurJacques ..... de .......................

...... Muyser, ..... agissant. en .... qnalité de mandataire .......................................... .............................................. (2) depose ........ ce ..vAngfc ^ sep.t .... s.ep.tembre .................. (3), à .. ........ 15 .......... .... heures, au Ministère de l'Economie Nationale et des Classes Moyennes, à Luxembourg: 1. la présente requête pour l'obtention d 'un brevet d'invention concernant: ......,. î.Verbundblech.rrKo.ch.gerât ..... and .... Ve.rfahr.en ..... zu .... .â§.ss.en .... & e ^^ (4) déclare, en assumant la responsabilité de cette déclaration, que l '(es) invenieur (s) est (sont): ....... Svein .... ElDE, ..... Asheinveien, ..... Sandve.df à .... 43oQ .... S.MDMS .., ...... N.oi: vêge .. .............. <5) 2. la délégation de pouvoir, datée de ...... OSLO ................. ................................ le ... 3.Q ...._ aQÛt ..... l .97..9 .............

3. la description en langue ....... allemande .................................... . de l'invention en deux exemplaires; 4 .......... 1 .................. planches de dessin, en deux exemplaires; 5th la quittance des taxes versées au Bureau de l'Enregistrement à Luxembourg, le .... 27 ..... septembre ..... 197-9 .............. ......................................... »........ .................................................. .................................................. ....................

revendique pour la susdite demande de brevet la priorité d'une (des) demande (s) de (6) .......................... brevet ........................................... déposée® en (7). ....... Norvège .......................................... ...............................

le ......... 29 ..... septembre .... l9.-7.8 ........... (No ......... 78 .. . 331.7.) .............................................. .................................................. ...................— (8) au nom de. la, ... déposante ............................................ .................................................. .................................................. ........................................... <»* élit domicile pour lui (elle) et, si désigné, pour son mandataire, à Luxembourg .................................— .. ...... 35 * .bld ...... Bayai ................................. .................................................. .................................................. .................................................. ...............- (io) sollicite la délivrance d'un brevet d'invention pour l'objet décrit et représenté dans les annexes susmentionnées, - avec ajournement de cette délivrance à .. ........... U ..................... ...... mois.

Le ... l.mandattaire ........... î: ................>.

lAj: .......... a ......_ l, ....... i ......) ........) Π, Procès-verbal de Dépôt

La susdite demande de brevet d'invention a été déposée au Ministère de l'Économie Nationale et des Classes Moyennes, Service de la Propriété Industrielle à Luxembourg, en date du: A. .. · .......... . · -., Pr. Le Ministre f ", T à ............ 15 ......... heures" ·. de l’Economie Nationale et des Classes Moyennes,

Tto .......................! \ 3Vp) V ...... / '' b. A'iii '——- r— r -: - r -: - -: - r-— -... ______ D. 5o.767

PRESSURE BY PRIORITY

'the patent / 9W' application

In Norway

From: 29. SEPTEMBER 1978

• v -v v 1 v vO

PATENT APPLICATION

in

Luxembourg

Applicant: ARDAL OG SUNNDAL VERK a.s. .

Concerning : "Composite sheet cooking device and process for its production

The text contains:

A description: Pages 4 to 14 followed by:

Claims: Pages 1 to 3 ß I # t.

• #

Composite sheet cooking appliance and method for its production.

i

The invention relates to composite sheet cooking devices and a method for producing such devices and in particular of layered pots, frying pans u. Like., Which is made of a core material such as aluminum, copper, steel of ordinary quality, which on one or both sides with a relatively thin layer of a more corrosion-resistant material such as stainless steel, titanium and the like. Like., Coated.

Cooking appliances made of steel sheet coated with enamel, «

Aluminum or stainless steel are made, all have their advantages and disadvantages. It is known to those skilled in the art that a cooking device made from a layered blank is more advantageous in use than a cooking device made from a homogeneous material. Reference is made, for example, to a report in the magazine "Aluminio", 1973, pages 367-381: "II pentolame die allumino problemi e futuro" and to an article in Métal Progress, May 1975, "Countertop Range" by William Moreland.

- 5 -

When layered cooker (composite sheet cooker) is heated by the bottom, the temperature in the side wall also increases, and the outside diameter of the pot becomes larger, so that the bottom is not stressed unlike that of a cooker is the case that is made of stainless steel and has an extra thick bottom.

A cooking appliance that has a heat-conducting metal layer on the side wall can therefore have a relatively thinner aluminum layer or copper layer in the floor than is necessary for a non-layered cooking appliance made of stainless steel. Cooking devices can therefore be made with a higher temperature sensitivity and a higher cooking efficiency than the conventional cooking devices made of stainless steel.

It is known that cooking utensils can be manufactured from a composite blank obtained by rolling a steel sheet of ordinary quality and two steel sheets of corrosion-resistant steel together at a high temperature. However, this product is not particularly popular in Europe because there is a risk of the food burning, since most of the heat transfer is concentrated in the annular area along the peripheral part of the bottom.

Layered materials for cooking utensils can e.g. be made by "plating". However, a sufficiently strong bond between, for example, aluminum and stainless steel is difficult to obtain, since both metals have relatively thick oxide layers. One plating process that has gained some technical importance is high temperature rolling under vacuum.

A coating (plating) of aluminum and stainless steel can also be done by explosion or explosive! "I

J

i '1- 6 - plating, but this method is even more expensive than "rolling under vacuum.

Cooking equipment of very useful quality can be made by laminating copper and stainless steel or aluminum or stainless steel sheets, but the price of the product is very high. A laminated sheet (a composite sheet) consisting of a core sheet made of aluminum, which is coated on both sides with 0.38 mm (0.15 ") stainless steel, costs three times as much as a corresponding blank made of stainless steel.

When deep-drawing cylindrical devices made of layered blanks consisting of material layers with different modulus of elasticity, such as rust-resistant steel and aluminum, which are bonded together over their entire contact surface, it often happens! that the bond between the stratification layers is loosened or that cracks appear in the weak layer. This

The phenomenon cannot be controlled in deep drawing, 1 so the amount of waste can be quite large.

Laminated sheets cannot be made by brazing in rolling mills. The soldering of individual circular blanks (blanks) over the entire surface is more expensive than rolling together at high pressure and high

Temperature, because the tool is expensive and too! the solder. The layered circular blanks, ["made by soldering, are difficult for one | - To be subjected to deep drawing and the amount of rejects is even higher than when stacking

Rollers.

i! i i - 7 -

A disadvantage of using layered material is that layered waste, cut and cut metals (composite sheet) are difficult to sell to steelworks or steel foundries.

The object of the invention is to develop a cooking device of the aforementioned type which has good heat transfer through the entire floor and less heat loss through the wall than is the case with conventional cooking devices.

It is also an object of the invention to develop a cooking device that can be manufactured from layered material at a more reasonable price than the previously known cooking devices.

It is also an object of the invention to develop a cooking appliance which can be formed by deep drawing without the risk of the layered layers forming cracks in the cooking appliance wall.

Likewise, it is an object of the invention to develop a layered cooking appliance blank in which the amount of the layer material waste is reduced to a minimum.

It is also part of the object of the invention to develop a cooking device which is built from layered material at a reasonable price and in such a way that the coating process can be carried out by the manufacturer of the cooking device.

A cooking device according to the invention differs essentially by the fact that the layer layers Γ - 8 - are firmly connected to one another somewhat upwards via the base surface and the side wall. The layers can also be fixed together along the top of the wall. The outer layer can be "inflated" over part of the wall height, so that there is an insulating space between the outer layer and the wall layer. The bond between the inner layer and the core layer can be less in the radial and possibly in the axial extent than between the core layer and the outer layer. The bond between the layer layers is preferably produced by soldering (hard soldering). The bond at the upper edge of the cooking device can be formed by folding the outermost part of the inner layer or the outer layer, optionally also with the use of a binding agent. The connection can optionally be provided at the upper edge by layering an annular peripheral part of the blank in a manner similar to that for the base surface *

In a method according to the invention, individual circular blank components (circular blanks) are provided with an L5t-N medium or the like and, if appropriate, with a soldering flux over the central part thereof, which corresponds to the cbm bottom and the lower part of the wall of the cooking device, whereupon the circular blanks are simultaneously deep drawn in one and the same drawing press, whereupon the soldering is done by heating. Brazing or brazing can also be carried out before deep drawing.

In a layered circular blank for producing a cooking device according to the invention. the layer layers are molecularly connected to one another via a central / / V "s - 9 - circular zone and optionally along an annular circumferential zone. In a layered round blank consisting of three or more layer layers, one of the outer layers can be loosely attached (not soldered to the other layers ).

If a cooking device according to the invention is manufactured, a circular blank sheet, e.g. made of aluminum and a corresponding sheet of stainless steel covered with a flux and a solder in such a way that a molecular bond is obtained only in the bottom part and in part of the wall of the finished cooking appliance. Deep drawing can be done before or after brazing.

An important advantage of the invention is that the formation of cracks during the deep-drawing of the layered blank is reduced to a minimum, since the bond extends only over a smaller part of the wall. Since the blanks are only layered over the parts to which the bond exists, the cut remnants and blanks of the blank material are practically free of solder and the individual layers of the waste material are not bonded to one another, so that they can be easily sorted and sold.

*

Cooking device blanks can be made by the cooking device manufacturer itself, since it is not particularly difficult to coat the cut circular blanks with foils of solder metal and flux over the surfaces to which the binding is to be brought about. The heating can be done by means of a medium frequency or high frequency furnace. If desired, deep drawing can be done after soldering. The outer edge can be sealed before or after / / Λ t - 10 -

Deep drawing is done. Sealing can be done by

Ultrasonic welding, folding or gluing are done.

As mentioned, in an advantageous embodiment of the invention, the wall of the cooking appliance can be "inflated" after deep-drawing and sealing or sealing the edges, so that an insulating space between the outer layer is made of stainless steel and the inner layer is made of aluminum or copper . In this way a layered cooking device is obtained which has good thermal conductivity in the floor and in the wall, where the wall is effectively insulated from the outside.

Materials other than aluminum and copper can also be used as heat-conducting layers, for example steel of ordinary quality. In addition to brazing, other bonding methods can also be used, for example ultrasonic welding, friction welding, adhesive bonding, etc.

The invention is explained in more detail below in conjunction with the accompanying drawings, in which:

Figure 1 is a sectional view of a half part of a round blank for a cooking device in the form of a stratification on two layers.

Figure 2 is a corresponding sectional view of a round blank from three layers. 3 shows a sectional view of a round blank made of three layers, the inner and outer layers being connected to the core layer at different extents, and / or "t - 11 -

4 shows a view similar to FIG. 3 with the exception of the edge part, and

6 shows a corresponding sectional view through a cooking appliance which has been produced from the blank according to FIG. 4;

Fig. 7 is a folded seam along the upper part of a cooking device and

8 and 9 are sectional views of cooking appliances which have been produced from blanks according to FIGS. 3 and 4, but with a "blown" side wall.

1 and 2 are sectional views of circular blanks, so-called blanks. 1 shows a blank in the form of a layered sheet 1 consisting of a main sheet 2 made of a material with a relatively good thermal conductivity, such as copper or aluminum, and a relatively thin sheet 3 made of stainless steel. The layer plates 2 and 3 are firmly adhered to one another via a central circular region A and an annular circumference region B, at which points a solder or welding agent 4, 5 is arranged between the plates. The round blank according to FIG. 2 differs from the blank according to FIG. 1 due to the fact that the layered sheet 6 is provided in addition to the aforementioned sheets 2 and 3 with a thin outer layer 7 made of stainless steel, which is provided with the core sheet 2 loosely connected (not soldered). Furthermore, the inner 31ech 3 has a free peripheral part 8 to form a folded saint (FIG. 7).

3 shows a layered blank 9 with a / / - 12 -

Core sheet 10 made of aluminum or copper and an outer sheet 11 made of stainless steel. The inner sheet 12 is with the core sheet over a central! j circular region C adhered, which is provided with j a solder 19 which radially somewhat! extends beyond the bottom of the cooking appliance to be manufactured. The outer 3-sheet 11 is connected to the core sheet 10 via a corresponding central circular surface D which has a substantially greater radial extension than the area C. The inner sheet 12 has a free peripheral edge part 13 without the layer sheet 14 to form the hemline shown in FIG. 7.

Fig. 4 shows essentially the same blank 15 as Fig. 3 with the exception that both outer sheets 16 and 17 are connected to the core sheet 18 along an annular circumferential part E, via which part a solder 19 'is arranged between the sheets .

FIG. 5 shows a sectional view of a cooking appliance which has been produced from the round blank shown in FIG. 1. The base surface on which the sheets are adhesively connected to one another is denoted by A, and a corresponding peripheral surface by B as in FIG. 1.

FIG. 6 shows a sectional view of a cooking appliance which has been produced from the blank according to FIG. 4. As can be seen, the bond between the core sheet 18 and the inner sheet 17 (area C) covers the bottom part and the rounded transitions to the wall, while the binding .. D between the core sheet 18 and the outer sheet 16 is somewhat higher along the wall of the Cooking utensil stretches course, the inner binding zone can be of the same

/ A

* - 13 -

Extent like the outer bond zone D or higher.

Fig. 8 shows a cooking appliance which has been produced from the blank according to Fig. 3, the connection between the upper edge parts. 3lëche 10, 11, 12 has been formed by a hem, as shown in Fig. 7. The fold seam can be attached with an adhesive. The space between the core sheet IO of the wall and the *. outer sheet 11 of the wall is inflated so that a

Gap 20, which is filled with gas or air,? is seen. The cooking device according to FIG. 9 is practically identical to the cooking device according to FIG. 8, with the exception that the cooking device according to FIG. 6 has been produced from the blank shown in FIG. 4.

The cooking appliance is formed by simultaneously deep drawing two, three or four round blanks. Brazing can be done in such a way that a foil made of brazing metal, which has been precoated with a flux, is arranged between each layer plate. The heating is preferably done under pressure and can be obtained by a medium frequency or high frequency furnace. The deep-drawing process can be carried out before or after brazing.

In the description, two of the layers were referred to as the inner sheet or the outer sheet, but the scope of the invention also includes embodiments in which the round blank is turned upside down so that the upper sheet becomes the bottom sheet and vice versa. In one embodiment, in which one of the laminated sheets is not firmly adhered to the base of the base sheet, can the effect? /> · I - 14 - i achieved that the floor by a certain amount! is "lifted" off the hotplate when a particular one

Temperature is reached so that the heat transfer to | Content of the cooking appliance is reduced.

; νΛ. .

• ». «

H

Claims (10)

2. Cooking appliance according to claim 1, characterized in that the laminated sheets are connected to one another along the upper edge part of the wall. 3. Cooking appliance according to claim 1 or 2, characterized in that the space between the outer plate (11) and the core plate (10) is "inflated" over part of the wall height, so that an insulating space (20) between the outer! i I sheet and the core sheet of the wall is formed. 4. Cooking appliance according to claim 1, 2 or 3, with a core sheet, an inner sheet and an outer sheet, characterized in that the bond between the inner sheet and the core sheet of less radial and optionally axial extent than between the core sheet and the Outer sheet is. 5. Cooking appliance according to one or more of the preceding claims, characterized in that the bond between the plates is formed by a solder. 6. Cooking device according to one or more of claims 1 and 3-5, characterized in that at the upper edge of the device, the edge part of the inner plate or the Ausseriblech.es over the edge part of the other plate, optionally using an adhesive, is folded to to form a hem. . 7. A method for producing a cooking appliance according to one or more of the preceding claims, characterized in that the individual round blank “components are layered with one another before deep-drawing (firmly connected). 8. A method for producing a cooking appliance according to - 3 - one or more of claims 1-6, characterized in that the individual round blank components with a solder and, if necessary, a flux over the central part of the same, the distant bottom and the corresponds to the lowermost part of the wall of the cooking appliance, be provided and placed on top of one another, whereupon the blanks are simultaneously deep-drawn in one and the same drawing press, whereupon the soldering is carried out by heating, preferably under pressure. 9. Round layered blank for the production of cooking appliances according to one or more of claims 1-6 from two or three layer plates, characterized in that the layer plates are molecularly connected to one another only via a central circular zone. 10. Layered blank according to claim 9, characterized in that the layer plates are connected to one another along annular circumferential parts thereof. * 11. Round blank according to claim 9 with three or more laminated sheets, characterized in that one of the outer layers sits loosely on one of the other (is not adhesively connected). ; LKAààAV