Monitoring device for flexible heating elements

Electric heating – Heating devices – With heating unit structure

Reexamination Certificate

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Details

C219S490000

Reexamination Certificate

active

07067776

ABSTRACT:
The invention concerns a controlling and monitoring device for avoiding damage through overheating in the case of flexible, textile surface heating elements which include at least two opposed contact conductors (3.1, 3.2) made of electrically conducting, non-insulated fibers or wires between which there extends a plurality of heating conductors (8) which are electrically connected to the contact conductors (3.1, 3.2) and to a current-voltage source. At least one additional conductor (1) is guided along at least one contact conductor over the heating conductors (8), wherein the additional conductor (1) is electrically insulated by a covering material and is connected to an electric or electronic evaluation switch (11). The coating material has a softening range which is above the standard heating temperature of the surface heating element, but below the permissible thermal limit temperature of the surrounding materials and of the base material (12), wherein, in the case of overheating, the coating material melts and wherein the heating conductors (8.1, 8.2), together with the additional conductor, form an electrical contact via which, for the purpose of controlling any overheating, an electric current flows to the electric or electronic evaluation unit which is connected to the current-voltage source.

REFERENCES:
patent: 3472289 (1969-10-01), Riordan et al.
patent: 4538054 (1985-08-01), de la Bretoniere
patent: 4983814 (1991-01-01), Ohgushi et al.
patent: 5422462 (1995-06-01), Kishimoto
patent: 6403935 (2002-06-01), Kochman et al.
patent: 6713733 (2004-03-01), Kochman et al.
patent: 41 01 290 (1992-07-01), None
patent: 90 07 519.6 (1992-07-01), None
patent: 198 31 574 (2000-01-01), None

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