Cooking oven with anti-condensation door

• US 8,091,543 B2
• Filed: 06/04/2007
• Issued: 01/10/2012
• Est. Priority Date: 08/04/2006
• Status: Expired due to Fees

• Current Assignee: Electrolux Professional SPA (AB Electrolux)
• Original Assignee: Electrolux Professional SPA (AB Electrolux)
• Inventors: Baumann, Udo, Raus, Dragan
• Primary Examiner(s): Bomberg, Kenneth
• Assistant Examiner(s): BERNSTEIN, DANIEL A
• Application Number:
  US11/757,480
• Publication Number:
  US 20080029078A1
• Time in Patent Office: 1,681 Days
• Field of Search: 126/200, 126/190, 126/194, 993/41
• US Class Current: 126/200
• CPC Class Codes: F24C 15/04 with transparent panels
• CPC Class Codes: F24C 15/045 being dismountable, e.g. giving access for cleaning
• CPC Class Codes: H05B 2203/013 Heaters using resistive films or coatings
• CPC Class Codes: H05B 2203/016 Heaters using particular connecting means
• CPC Class Codes: H05B 3/84 Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields

Abstract

The present invention generally relates to a cooking oven, which is provided with a cooking cavity and a door adapted to close the cooking cavity. The door is provided with an outer frame and one or more glass panes supported by such frame along the periphery thereof. On the surface of at least one of the glass panes there are applied heating means, which include a layer of substantially clear, e.g. transparent resistive material, and means adapted to connect two sides of such layer of resistive material to appropriate terminals energizable by an electric voltage supplied from a source available inside the oven.

Claims

1. Cooking oven comprising:

a cooking cavity;

a door adapted to close said cooking cavity and provided with an outer frame;

one or more glass panes supported by said frame along the periphery thereof;

a first layer of substantially transparent resistive material provided on a first portion of the surface of at least one of said glass panes;

conductive members provided on the surface of at least one of said glass panes,

wherein the first layer of substantially transparent resistive material is coupled to the conductive members such that the first portion is kept free of condensate forming thereon; and

a second layer of resistive material provided on a second portion of the surface of at least one of the glass panes,

wherein the second layer of resistive material is not electrically connected to any power source and is not capable of being electrically connected to any power source such that it does not take part in a condensate removal process and is not capable of taking part in the condensate removal process.

2. Cooking oven according to claim 1, wherein said first layer of resistive material is applied along a vertical strip extending centrally on the glass pane on which it is applied.

3. Cooking oven according to claim 1 or 2, wherein said first layer of resistive material has a surface resistance comprised between 15 and 25 Ohm/m².

4. Cooking oven according to claim 2, wherein at two opposite, preferably vertical edges of said vertical strip there are provided two respective conductive members or bus bars, each one of which is electrically connected to a respective one of said edges.

5. Cooking oven according to claim 1, wherein between the structure of said oven and said door there are provided electrically connecting means, and in that each one of said conductive members is electrically connected to a respective one of said electrically connecting means.

6. Cooking oven according to claim 5, wherein said electrically connecting means comprise two pairs of automatic-release fit-in moving connectors adapted to separate automatically whenever said door is opened.

7. Cooking oven according to claim 1, wherein said door is provided with two mutually opposing glass panes, an inner glass pane and an outer glass pane, extending parallel to each other at a definite distance from each other, so that a hollow space is defined therebetween, and in that said first layer of resistive material is applied on the surface of the inner glass pane that faces into said hollow space.

8. Cooking oven according to claim 7, wherein said inner glass pane is adapted to be selectively hinged on to said outer frame of the door, with the aid of hinging means between a vertical corner of said inner glass pane and a vertical edge of said outer frame, so as to be able to open out relative to said vertical edge of said outer frame.

9. Cooking oven according to claim 1, wherein said first layer of resistive material is prevailingly comprised of stannous oxide.

10. Cooking oven according to claim 1, wherein said oven is provided with power supply means adapted to energize said first layer of resistive material at a low voltage not exceeding 48 V.

11. Cooking oven according to claim 1, wherein the cooking oven is adapted to supply said first layer of resistive material with a power comprised between 1500 and 2200 W/m².

12. Cooking oven according to claim 1, wherein a remaining portion of the surface of the inner glass pane, which is not covered by said heating means, is coated with the second layer of resistive material that is of the same resistive material as said first layer of substantially transparent resistive material.

13. Cooking oven according to claim 1, wherein the cooking oven comprises electric conductors adapted to connect a lower region of the conductive members to the electric terminals.

14. Cooking oven according to claim 1, wherein the conductive members are positioned within the viewing area of at least one of the one or more glass panes.

15. Cooking oven according to claim 1, wherein the second layer of resistive material surrounds the first layer of resistive material.