Baking oven with baking oven muffle

• US 6,392,203 B1
• Filed: 09/27/2000
• Issued: 05/21/2002
• Est. Priority Date: 03/27/1998
• Status: Expired due to Term

• Current Assignee: BSH Hausgeraete GmbH (Robert Bosch GmbH)
• Original Assignee: BSH Bosch und Siemens Hausgerã¤Te GmbH (Robert Bosch GmbH)
• Inventors: Schmidmayer, Gerhard
• Primary Examiner(s): PELHAM, JOSEPH MOORE
• Application Number:
  US09/671,826
• Time in Patent Office: 601 Days
• Field of Search: 219/405-407, 219/409-411, 219/391, 126/19.R, 126/273.R, 148/275
• US Class Current: 219/405
• CPC Class Codes: F24C 15/005 Coatings for ovens
• CPC Class Codes: F24C 7/06 Arrangement or mounting of electric heating elements

Abstract

A baking oven includes a metallic baking oven muffle that can be closed off on a front side by a door. The muffle walls have heating elements for heating the cooking chamber to over approximately 180° C. and/or for heating the food disposed therein to be cooked. The muffle has a protective layer covering the muffle walls at least on the inner side. To improve the use properties of the baking oven muffle, the thickness of the protective layer is less than approximately 30 μm. The protective layer is formed as a hard sol-gel layer having a thickness of approximately 10 μm, preferably, between approximately 5 and 10 μm. The protective layer is transparent. The inner sides of the muffle serve as a reflector. A functional sol-gel layer is disposed on the hard sol-gel layer. The functional sol-gel layer has a thickness of approximately 10 μm, preferably, 2 to 3 μm. When the muffle is aluminum, the protective layer is an anodized aluminum oxide layer. The heating elements are applied to an insulating protective layer with thick-film technology. A stabilizing frame is substantially formed by the baking-oven muffle insulation. The frame supports the muffle on its outside. A muffle wall thickness is approximately 0.3 to 0.5 mm, preferably, 0.4 mm. Protective layer thickness is less than 20 μm, preferably, between approximately 5 and 10 μm.

Claims

1. A baking oven, comprising:

a metallic baking oven muffle having a front side and muffle walls defining a cooking chamber and inner sides;

a door for closing off said front side of said muffle;

heating elements for heating said cooking chamber disposed at said muffle walls;

a protective hard sol-gel layer covering said muffle walls at least on said inner sides, said protective layer being transparent and having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector; and

a functional sol-gel layer disposed on said hard sol-gel layer.

2. The baking oven according to claim 1, wherein said functional sol-gel layer is different functional sol-gel layers, said muffle walls have surface regions, and said different functional sol-gel layers are disposed on different ones of said surface regions.

3. The baking oven according to claim 1, wherein said muffle is aluminum, and said protective layer is an anodized aluminum oxide layer.

4. The baking oven according to claim 1, wherein said hard sol-gel layer has a thickness of approximately 10 μ

m.

5. The baking oven according to claim 1, wherein said hard sol-gel layer has a thickness between approximately 5 and 10 μ

m.

6. The baking oven according to claim 1, wherein said functional sol-gel layer has a thickness of approximately 10 μ

m.

7. The baking oven according to claim 1, wherein said functional sol-gel layer has a thickness of approximately 2 to 3 μ

m.

8. A baking oven, comprising:

a metallic baking oven muffle having a front side and muffle walls defining a cooking chamber and inner sides;

a door for closing off said front side of said muffle;

heating elements for heating said cooking chamber disposed at said muffle walls;

a protective layer covering said muffle walls at least on said inner sides, said protective layer being transparent and having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector;

at least part of said muffle walls having an insulating protective layer; and

said heating elements being applied to said insulating protective layer with thick-film technology.

9. A baking oven, comprising:

a metallic baking oven muffle having a front side and muffle walls defining a cooking chamber, outer sides, and inner sides;

a door for closing off said front side of said muffle;

heating elements for heating said cooking chamber disposed at said muffle walls;

a protective layer covering said muffle walls at least on said inner sides, said protective layer being transparent and having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector;

at least part of said outer sides having an insulating protective layer; and

said heating elements being applied to said insulating protective layer with thick-film technology.

10. A baking oven, comprising:

a metallic baking oven muffle having a front side and muffle walls defining a cooking chamber, outer sides, and inner sides;

a door for closing off said front side of said muffle;

heating elements for heating said cooking chamber disposed at said muffle walls;

a protective layer covering said muffle walls at least on said inner sides, said protective layer being transparent and having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector; and

said heating elements being applied to said outer sides with thick-film technology.

11. A baking oven, comprising:

a metallic baking oven muffle having a front side and muffle walls defining a cooking chamber and inner sides;

a door for closing off said front side of said muffle;

heating elements for heating said cooking chamber disposed at said muffle walls;

a protective layer covering said muffle walls at least on said inner sides, said protective layer being transparent and

having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector; and

a stabilizing frame substantially formed by a baking-oven muffle insulation, said muffle having an outside, and said frame supporting said muffle on said outside.

12. A baking oven, comprising:

a metallic baking oven muffle having a front side and muffle walls having a thickness and defining a cooking chamber and inner sides;

a door for closing off said front side of said muffle;

heating elements for heating said cooking chamber disposed at said muffle walls;

a protective layer covering said muffle walls at least on said inner sides, said protective layer being transparent and having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector; and

said thickness of said muffle walls being approximately 0.3 to 0.5 mm.

13. A baking oven, comprising:

a metallic baking oven muffle having a front side and muffle walls having a thickness and defining a cooking chamber and inner sides;

a door for closing off said front side of said muffle;

heating elements for heating said cooking chamber disposed at said muffle walls;

a protective layer covering said muffle walls at least on said inner sides, said protective layer being transparent and having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector; and

said thickness of said muffle walls being approximately 0.4 mm.

14. In combination with a baking oven having a door, a baking oven muffle, comprising:

metallic muffle walls defining a front side, a cooking chamber, and inner sides, said front side disposed to be closed off by the door;

heating elements for heating said cooking chamber disposed at said muffle walls; and

a protective hard sol-gel layer covering said muffle walls at least on said inner sides, said protective layer being transparent and having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector; and

a functional sol-gel layer disposed on said hard sol-gel layer.

15. In combination with a baking oven having a door and heating elements for heating the oven, a baking oven muffle, comprising:

metallic muffle walls defining a front side and inner sides, said front side disposed to be closed off by the door; and

a protective hard sol-gel layer covering said muffle walls at least on said inner sides, said protective layer being transparent and having a thickness less than approximately 30 μ

m, said inner sides serving as a reflector, the heating elements disposed at said muffle walls; and

a functional sol-gel layer disposed on said hard sol-gel layer.