Patent · US Expired

Temperature switch

US5055819A · kind A · utility

6Cited by

3References

15Claims

0Family size

Assignee

E.G.O. Elektro-Gerate Blanc u. Fischer · DE

Inventors

Gerhard Goessler · Oberderdingen, DE
Eugen Wilde · Knittlingen, DE

Key dates

Filing date	Dec 12, 1990
Grant date	Oct 8, 1991
Priority date	—
Expiry date	Dec 12, 2010

Classification

Technology area (CPC H)Electricity
CPC primaryH01H37/48
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A temperature switch, used more particular as a temperature limiter for a radiation heating element (11) for heating a glass-ceramic plate (12), has radiation heaters (13, 14). Its rod-shaped temperature sensor (20) has an expansion rod (24) which is disposed in a tube (25) acting as a comparison norm and can be made of a chromium-iron-aluminum alloy and is heat-treated above 1100.degree. C. The tube (25) can be made of a radiation-absorbing material or is coated with such a material, for example, cordierite, non-transmissive glass-ceramics or quartz material. The result of both steps is that the temperature switch has an enhanced switching amplitude and therefore a reduced switching frequency.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.