Self-regulating electric heater
US4626666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1984 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | Oct 18, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A self-regulating electric heater includes a plurality of ceramic PTC resistors having flat contact surfaces on their opposite sides disposed between a pair of flat electrode plates with the contact surfaces in electrical and thermal contact with the plates. A support frame of electrically insulative material is formed with receiving portions respectively for the PTC resistors and the electrode plates to positions and hold the resistors and plates in assembled relationship for insertion as a single assembly into a closed-end cavity in a metallic radiator with the electrode plates in good heat transfer contact with the inner wall surface of the cavity. The frame is provided with spring seats receiving springs which coact with the radiator to bias the support frame into the cavity to insure stable intimate thermal contact between the electrode plates and inner cavity wall. The PTC resistors may be provided with chamfered edges along the peripheries of the flat contact surfaces thereof. The electrode plates may be provided with a beveled corner adjacent to the closed end of the cavity to avoid stress between the plates and cavity wall when the support frame is inserted into the cavity…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.