Control system for an electrical heating device, and particularly for an electrical sauna stove
Abstract
Abstract A control system for an electrical heating device and in particular for an electrical sauna stove. The system comprises three heating resistances or groups of heating resistances connected to different phases as well as a coil switch arrangement which can be controlled by means of a control switch and possibly by means of a temperature limiter. A temperature controller has been arranged so as to connect and disconnect, respectively, the loads of the different resistances stepwise, for example, with intervals of 5* to 10*C. Each of the said loads consists of a resistance connected to one phase or of a part of such resistance. The temperature controller consists of an at least three-pole controller arrangement for each phase and the coil switch arrangement consists of one three-pole coil switch connected in series with the controller arrangement.
Inventors
- 👤 Pentti Ilmari Rimmi
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |