The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 1987
Filed:
Dec. 16, 1985
O/Y Kyro A/B Tamglass, Tampere, FI;
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.