Title: Furnace temperature control system

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Claims: What is claimed is:

1. A furnace heating and control system which comprises a furnace heating means;

a first temperature controller, set to a temperature above the required treatment temperature, and connected to a first means for measuring the temperature of the furnace atmosphere, and to the heating means;

a second temperature controller, set to a temperature below the required treatment temperature, and connected to a means for measuring the temperature of an article being treated and via a timing mechanism and a change-over relay, adapted to change control of the heating means from the first temperature controller to a third temperature controller, to the heating means; and

a third temperature controller, set to the required treatment temperature, and connected to a second means, for measuring the temperature of the furnace atmosphere, and to the heating means.

2. A furnace heating and control system in accordance with claim 1, wherein the first temperature controller is set to a temperature just below the maximum operating temperature of the furnace.

3. A furnace heating and control system in accordance with claim 1 wherein the timing mechanism starts when the second temperature controller comes into operation and switches off all power to the heating means when a predetermined time has elapsed.

4. A furnace heating and control system in accordance with claim 1 wherein the temperature controllers are pyrometers.

5. A furnace heating and control system in accordance with claim 1 wherein the means for measuring temperature are thermocouples.

Other info:

Inventors: Biddulph, Richard Hampton (Worcester Park, EN)

Application Number: 524839
Filing Date: 1974-11-18
Publication_date: 1976-04-27
Assignee: United States Borax & Chemical Corporation (Los Angeles, CA)
Primary Class(es): 236/15R 219/491, 236/15BB, 236/46R
Other Classes:
US Patent Ref:

2118642	May, 1938	Flynn et al.	236/46.
3127498	Mar, 1964	Gould et al.	219/491.
3370120	Feb, 1968	Lasch et al.	236/15.

Other Refs:
Primary Examiner: Wayner, William E.
Assistant Examiner:
Attorney: Thornton; James R.