Burning oven

• US 7,534,028 B2
• Filed: 06/15/2005
• Issued: 05/19/2009
• Est. Priority Date: 10/21/2004
• Status: Active Grant

• Current Assignee: Ivoclar Vivadent AG
• Original Assignee: Ivoclar Vivadent AG
• Inventors: Jussel, Rudolf, Feichtinger, Heinrich K.
• Primary Examiner(s): VERBITSKY, GAIL KAPLAN
• Application Number:
  US11/153,782
• Publication Number:
  US 20060088077A1
• Time in Patent Office: 1,434 Days
• Field of Search: 374/31, 374/36, 374/38, 374 1- 2, 374/141, 374/144, 374/148, 374 10- 12, 374/20, 374/129, 374/30, 374/137, 374/179, 374/160, 374/163, 374/183, 219/201, 432/120
• US Class Current: 374/1
• CPC Class Codes: A61C 13/20 Methods or devices for soldering, casting, moulding or melting A61C13/04, A61C13/081 take precedence
• CPC Class Codes: F27B 17/025 for dental workpieces
• CPC Class Codes: F27D 19/00 Arrangements of controlling devices
• CPC Class Codes: F27D 21/0014 Devices for monitoring temperature
• CPC Class Codes: G01K 15/002 Calibrated temperature sources, temperature standards therefor arrangements with respect to the cold junction of thermo-electric elements G01K7/12

Abstract

A burning oven, especially for dental materials, is provided and includes a temperature detection element and a calibrating device for calibrating the temperature detection element. The calibrating device has a temperature sensor that in turn can be calibrated at a given number of temperature points, especially one or two temperature points.

Claims

1. A burning oven comprising:

a combustion chamber (16) formed by an oven hood (14) for the firing of dental restorations;

an oven base (22) below the combustion chamber;

a temperature detection element (12) disposed in said oven hood; and

a reusable calibrating device (26) for calibrating said temperature detection element, wherein said calibrating device has a temperature sensor (28) that is calibrated at a given number of temperature points, the calibrating device further including an essentially pure substance surrounding the sensor, and a further material that at least partially surrounds a portion of the temperature sensor, wherein said essentially pure substance is disposed at least in a closed space formed between said temperature sensor (28) and said further material, the further material completely surrounding said substance, and the calibrating device being fixedly installed in said burning oven (10) in the region of the oven base, said calibrating device (26) having a stored prescribed temperature profile for calibration of said temperature detection element (12), and wherein said calibration via said calibrating device is effected while starting a temperature profile, one time with overpressure or underpressure, and one time at ambient air pressure, wherein at least one of said temperature points is a melting point of an essentially pure substance (42) that upon reaching its melting point changes its aggregate state, and wherein the temperature of said essentially pure substance, which remains constant during the duration of the aggregate state change, is utilized for the temperature detection, and wherein said temperature sensor (28) is a thermocouple.

2. A burning oven according to claim 1, wherein said given number of temperature points is either one or two temperature points.

3. A burning oven according to claim 1, wherein said essentially pure substance is a metal.

4. A burning oven according to claim 1, wherein said further material is formed from a ceramic layer.

5. A burning oven according to claim 1, wherein said substance is selected from the group consisting of silver, aluminum, gold, magnesium, and zinc.

6. A burning oven according to claim 1, wherein said calibrating device (26), is disposed approximately centrally in the middle of the oven.

7. A burning oven according to claim 1, wherein an automatic adjustment device (30) is provided in said burning oven (10), and wherein by means of said adjustment device said calibrating device (26) adjusts said temperature detection element (12) at a plurality of temperatures.

8. A burning oven according to claim 7, wherein said temperature sensor (28), by said calibration via the given number of temperature points, determines a temperature offset of said calibrating device (26) which offset is stored until a subsequent calibration.

9. A burning oven according to claim 1, wherein said calibrating device (26) is embodied as a retrofittable device for a burning oven.