초록 ▼

An electrical heating apparatus protected against an overheating condition and a temperature sensitive electrical sensor for the use therewith are disclosed. The electrical heating apparatus includes an electrical heater for generating heat in proportion to the amount of electricity flowing through

An electrical heating apparatus protected against an overheating condition and a temperature sensitive electrical sensor for the use therewith are disclosed. The electrical heating apparatus includes an electrical heater for generating heat in proportion to the amount of electricity flowing through it, and it provides essentially all the heat for the apparatus. An electrical sensor is disposed in a thermally responsive relationship to the electrical heater. The electrical sensor includes a coextruded pair of spaced flexible plastic conductors and a coextruded flexible temperature sensitive electrical impedance material having predetermined temperature coefficient impedance characteristics along its entire length. The temperature sensitive material is in electrical contact with the flexible conductors and controls the flow of electricity between them. A control means associated with the electrical heater and the electrical sensor is responsive to a signal from the electrical sensor to control the electrical current flowing through the heater.

대표청구항 ▼

An electrical heating apparatus protected against an overheating condition and comprising an electrical heating means for generating heat in proportion to the amount of electrical current flowing therethrough, said heating means providing essentially all of the heat for the apparatus; an electrical

An electrical heating apparatus protected against an overheating condition and comprising an electrical heating means for generating heat in proportion to the amount of electrical current flowing therethrough, said heating means providing essentially all of the heat for the apparatus; an electrical sensor in a thermally responsive relationship with respect to said electrical heating means for monitoring the heat generated by said electrical heating means and for providing a signal in response to an overheating condition, said electrical sensor comprising a coextruded pair of spaced parallel flexible elongate conductors of electricity, said flexible conductors comprised of electrically conductive plastic, and a flexible elongate temperature sensitive electrical impedance material having predetermined temperature coefficient impedance characteristics along its entire length, said temperature sensitive material being coextruded parallel and coextensive with and in electrical contact with said flexible conductors along the length of said flexible conductors for monitoring the temperature at any point along the length of said temperature sensitive material by controlling the flow of electricity between said flexible conductors; and control means associated with said electrical heating means and said electrical sensor for controlling the electrical current flowing through said electrical heating means in response to a predetermined signal from said electrical sensor.