Resistor element assembly for a heating furnace of glass sheets

Details Resistor element assembly for a heating furnace of glass sheets Resistor element assembly for a heating furnace of glass sheets

1985-12-16

1987-09-22

Godici, Nicholas P.

Electrical resistors

With mounting or supporting means

Compensates for or permits resistor

219550, 29762, 294265, H01C 1016

Patent

active

046958215

ABSTRACT:
The invention relates to a resistor element assembly for a glass sheet heating furnace and to a method of replacing a resistor element. A resistor element is built by placing successively in longitudinal direction ceramic elements, with a resistance wire wound therearound. Between the ceramic elements are fitted ceramic spacer blocks whose diameter exceeds that of the resistance wire coils. The resistor element is carried by a support frame upon the spacer blocks. A problem to be resolved is to provide a long resistor element, wherein the major variations in length between the components of various materials caused by major temperature variations do not produce deformations in resistance wires. This problem has been resolved by fitting between one end of the support frame and the corresponding end of the resistor element a tensioned spring which compresses the resistor element at all operating temperatures against a limit stop at the other end of the support frame. The resistor element can be replaced by releasing said spring from the support frame and by pulling the resistor element out of a furnace by utilizing a core pin extending through the entire resistor element, whereby the ceramic elements remain subjected to compression stress. By using an auxiliary spring between the end of said core pin and the end of said resistor element, the compression holding the resistor element together can be maintained also during transportation and installation.

REFERENCES:
patent: 1715018 (1929-05-01), Von Brockdorff
patent: 1884232 (1932-10-01), Rehm
patent: 2571422 (1951-10-01), Cole et al.
patent: 3217279 (1965-11-01), Boggs
patent: 3387116 (1968-06-01), Dupuis
patent: 3846621 (1974-11-01), Roos
patent: 4401883 (1983-08-01), Watson
patent: 4464565 (1984-08-01), Spangler
patent: 4475030 (1984-10-01), Bailey

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