Oven with automatically movable shelf

• US 5,938,959 A
• Filed: 04/07/1998
• Issued: 08/17/1999
• Est. Priority Date: 04/07/1998
• Status: Expired due to Fees

• Current Assignee: Test Rite International Company Limited
• Original Assignee: Testrite Barparoma International LLC
• Inventors: Wang, Ping
• Primary Examiner(s): PELHAM, JOSEPH MOORE
• Application Number:
  US09/056,900
• Time in Patent Office: 497 Days
• Field of Search: 219/401, 219/394, 219/395, 219/403, 219/404, 219/453.11, 126/337 A, 126/337 R, 126/339, 126/20, 126/33, 99/417, 99/467, 426/510, 426/511
• US Class Current: 219/401
• CPC Class Codes: A47J 37/0623 Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity A47J37/0605 takes precedence
• CPC Class Codes: A47J 37/0629 with electric heating elements
• CPC Class Codes: F24C 15/16 Shelves, racks or trays inside ovens; Supports therefor

Abstract

A domestic oven includes a housing defining a cooking chamber, at least one stationary first heating element in the chamber, a shelf movably disposed in the chamber, a second heating element mounted to the shelf, and a drive operatively connected to the shelf for translating the shelf, together with the second heating element, in the housing. The shelf is made of heat conductive metal. A temperature sensor in heat conductive contact with the shelf senses the temperature of the shelf and of a metal tray or pan placed on the shelf in heat conductive contact therewith. The temperature sensor is operatively connected to an energization circuit for the second heating element for de-energizing the second heating element upon detecting a sudden rise in temperature. The second heating element is mounted to the shelf via insulating spacers. The oven is used to perform a hybrid steaming and baking method.

Claims

1. A domestic oven comprising:

a housing defining a cooking chamber;

at least one stationary first heating element in said chamber;

a shelf movably disposed in said chamber;

a second heating element mounted to said shelf; and

a drive operatively connected to said shelf for translating said shelf, together with said second heating element, in said housing.

2. The oven defined in claim 1 wherein said shelf is made of heat conductive metal.

3. The oven defined in claim 2 wherein said shelf is provided with a temperature sensor in heat conductive contact with said shelf.

4. The oven defined in claim 3, further comprising an energization circuit operatively connected to said second heating element, said temperature sensor being operatively connected to said energization circuit for de-energizing said second heating element upon detecting a sudden rise in temperature.

5. The oven defined in claim 4 wherein said second heating element is mounted to said shelf via insulating spacers.

6. The oven defined in claim 5 wherein said shelf is provided with a plurality of land surfaces for receiving a tray or pan containing a food product to be cooked.

7. The oven defined in claim 6 wherein said land surfaces define a horizontal plane, said second heating element being disposed on top of said shelf, said second heating element having an upper surface or rim located in approximately said plane.

8. The oven defined in claim 5 wherein said second heating element is a resistive type heating element.

9. The oven defined in claim 5 wherein said second heating element is disposed on top of said shelf.

10. The oven defined in claim 3 wherein said shelf is provided with a recess for receiving said temperature sensor so that said sensor is in heat conductive contact with said shelf.

11. The oven defined in claim 10 wherein said recess is defined by a heat-conductive sleeve attached to said shelf.

12. The oven defined in claim 1 wherein said shelf and said drive are operatively connected to one another for reciprocating said shelf in a vertical direction in said chamber.

13. The oven defined in claim 12 wherein said drive includes a motor mounted to said housing and disposed outside said chamber, said housing being provided with at least one vertical slot communicating with said chamber and traversed by a drive rod connected to said shelf, said slot being provided with a self-sealing closure.

14. The oven defined in claim 1, further comprising a baking pan disposed on said shelf, said baking pan including a steam generating chamber and at least one aperture in an upper surface in communication with said steam generating chamber for delivering steam to a lower surface of a food article placed over said aperture.

15. The oven defined in claim 14 wherein said baking pan includes a lower pan part and an upper pan part, said upper pan part including said upper surface, said lower pan part and said upper pan part being connected to one another via a steam tight seal.

16. The oven defined in claim 14 wherein said baking pan is in heat conductive contact with said shelf, said shelf being provided with a temperature sensor in heat conductive contact with said shelf, further comprising an energization circuit operatively connected to said second heating element, said temperature sensor being operatively connected to said energization circuit for de-energizing said second heating element upon detecting a sudden rise in temperature.

17. The oven defined in claim 16, also comprising an additional energization circuit operatively connected to said first heating element for energizing said first heating element during a baking cycle overlapping a steaming cycle and continuing after termination of said steaming cycle by said temperature sensor.

18. The oven defined in claim 14 wherein said baking pan includes a lower panel provided with a recess communicating with said steam generating chamber and receiving a predetermined quantity of water prior to a steaming and baking operation in said housing.

19. The oven defined in claim 14 wherein said upper surface is provided with a depression, said aperture being located in said depression.

20. The oven defined in claim 1, further comprising a first energization circuit operatively connected to said first heating element and an independent second energization circuit operatively connected to said second heating element.

21. The oven defined in claim 20 wherein said shelf is provided with a temperature sensor in heat conductive contact with said shelf, said temperature sensor being operatively connected to said second energization circuit for automatically de-energizing said second heating element upon detecting a sudden rise in temperature of said shelf.

22. The oven defined in claim 1 wherein said second heating element is mounted to said shelf via insulating spacers.

23. The oven defined in claim 1 wherein said shelf is provided with a plurality of land surfaces for receiving a tray or pan containing a food product to be cooked.

24. The oven defined in claim 23 wherein said land surfaces define a horizontal plane, said second heating element being disposed on top of said shelf, said second heating element having an upper surface or rim located in approximately said plane.

25. The oven defined in claim 1 wherein said second heating element is a resistive type heating element.

26. The oven defined in claim 1 wherein said shelf is provided with a recess for receiving a temperature sensor so that said sensor is in heat conductive contact with said shelf.

27. The oven defined in claim 26 wherein said recess is defined by a heat-conductive sleeve attached to said shelf.

28. The oven defined in claim 1 wherein said second heating element is incorporated into a tray or pan and is removably mounted to said shelf, said second heating element and said shelf being provided with mating electrical connectors for supplying electrical energy to said heating element.

29. The oven defined in claim 28 wherein said second heating element is incorporated into a lower part of said tray or pan, said tray or pan including an upper part defining, with said lower part, a steam generating chamber.

30. A cooking method comprising:

disposing a tray or pan and a food article on a movable shelf in a domestic-type oven so that said food article is supported on said tray or pan and so that said tray or pan is in turn supported on said shelf;

operating a drive to automatically move said shelf together with a heating element mounted to said shelf; and

energizing said heating element while said food article is disposed on said tray or pan in said oven.

31. The method defined in claim 30, further comprising generating steam in a chamber internal to said tray or pan and dispensing the steam through at least one aperture disposed in an upper surface of said tray or pan, said food article being deposited over said aperture.

32. The method defined in claim 31, further comprising energizing another heating element in said oven while said food article is disposed on said tray or pan.

33. The method defined in claim 32 wherein said another heating element is located at a bottom of said oven, resulting in a baking of said food article.

34. The method defined in claim 32 wherein said another heating element is located above said shelf in said oven, resulting in a browning of an upper surface of said food article.

35. The method defined in claim 32 wherein the energizing of said another heating element occurs during and after the generating of said steam.

36. The method defined in claim 31, further comprising depositing a predetermined aliquot of water into said chamber prior to the generating of said steam, said steam being generated from said aliquot of water mainly owing to heat from said heating element.

37. The method defined in claim 30 wherein the disposing of said tray or pan and said food article on said shelf includes depositing said food article on said tray or pan prior to disposing said tray or pan, together with said food article, on said shelf in said oven.

38. The method defined in claim 30 wherein the moving of said shelf occurs during energizing of said heating element.

39. The method defined in claim 30 wherein the moving of said shelf occurs prior to the disposing of said tray or pan and said food article on said shelf.

40. The method defined in claim 30 wherein the moving of said shelf occurs after the disposing of said tray or pan and said food article on said shelf.

41. The method defined in claim 30, further comprising terminating the energizing of said heating element and continuing to cook said food article in said oven.

42. The method defined in claim 30, further comprising energizing another heating element in said oven while said food article is disposed on said tray or pan.

43. A cooking assembly comprising:

an oven having a baking chamber defined by a plurality of wall panels;

a first electrical connector mounted to one of said panels;

a tray or pan having an upper part and a lower part together defining a steam generating chamber;

a heating element incorporated into said lower part of said tray or pan; and

a second electrical connector permanently connected to said heating element and removably connected to said first electrical connector.

44. The cooking assembly defined in claim 43 wherein said tray or pan is provided with at least one aperture in an upper surface in communication with said steam generating chamber for delivering steam to a lower surface of a food article placed over said aperture.

45. The cooking assembly defined in claim 44 wherein said tray or pan includes a lower part and an upper part, said upper part including said upper surface, said lower part and said upper part being connected to one another via a steam tight seal.

46. The cooking assembly defined in claim 43, further comprising a temperature sensor and an energization circuit, said energization circuit being operatively coupled to said first electrical connector for energizing said heating element, said temperature sensor being in heat conductive contact with said tray or pan and in operative contact with said energization circuit for terminating the energizing of said heating element upon a sudden rise in detected temperature of said tray or pan.