Electric heating – Heating devices – With heating unit structure
Patent
1974-07-01
1976-02-24
Baris, A.
Electric heating
Heating devices
With heating unit structure
219205, 219311, 219505, 219536, 219541, 338 22R, 338274, H05B 302, H01C 702
Patent
active
039405915
ABSTRACT:
A self-regulating heater comprising a housing having a chamber therein and a heating element in the chamber. The heating element is a self-heating, positive temperature coefficient (PTC) resistor having low initial resistance which increases abruptly as its temperature rises above a given level. It has first and second substantially parallel surfaces spaced from one another, these surfaces each having a layer of electrically conductive material applied thereto for forming an ohmic contact surface. The heater further comprises a heat sink plate of thermally and electrically conductive material, the plate being positioned within the housing chamber so that one face of the plate is in heat-transfer relation with a first inside surface of the housing and so that the other side of the plate is in electrical contact and in heat transfer relationship with the first surface of the element. Spring means of electrically conductive material is disposed in the chamber between a trough-shaped second inside surface of the housing and the second surface of the element for biasing the heating element and the plate toward and into close heat-transfer relationship with the first inside surface of the housing. The spring means includes a first portion engageable with the surface of the element and a pair of outer marginal portions bent back on the first portion at an acute angle and resiliently engageable with the trough-shaped surface to guide the spring means as it is inserted into the chamber and to hold the spring means substantially centered with respect to the housing after assembly. First and second terminal means are carried by the plate and by the spring means, respectively, for supplying electrical power to the element. A dual-sealant seal comprising an inner cast-in place layer of room-temperature vulcanizing rubber material covered by a layer of cast-in place epoxy resin potting material is provided about the electrical leads connected to the first and second terminal means for closing the housing chamber and sealing the leads with respect thereto.
REFERENCES:
patent: 2606986 (1952-08-01), Sweger
patent: 2933708 (1960-04-01), Elliot et al.
patent: 3338476 (1967-08-01), Marcoux
patent: 3375774 (1968-04-01), Fujimura et al.
patent: 3564199 (1971-02-01), Blaha
patent: 3584189 (1971-06-01), Marcoux
patent: 3720807 (1973-03-01), Ting
patent: 3748439 (1973-07-01), Ting et al.
patent: 3824328 (1974-07-01), Ting et al.
Baris A.
Baumann Russell E.
Haug John A.
McAndrews James P.
Texas Instruments Incorporated
LandOfFree
Self-regulating electric heater does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Self-regulating electric heater, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-regulating electric heater will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2080717