Radiant electric heater arrangement
US5908571A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Apr 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/742
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A radiant electric heater arrangement is provided for connection to a dual voltage supply which provides a first alternating current supply voltage and a second alternating current supply voltage higher than the first. The arrangement includes a heater having at least one heating element and a manually operable multiple discrete position switch means for manually selecting in sequence a predetermined number of discrete different power settings for the at least one heating element from the voltage supply. The arrangement further includes control means co-operating between the switch means and the supply whereby in each position of a first sequential series of discrete positions of the switch means the at least one heating element is selectively energisable from the first supply voltage in such a way that at least one selected proportion of half cycles in a predetermined number of half cycles of the first supply voltage is or are arranged for application to the at least one heating element, and further whereby in each position of a second sequential series of discrete positions of the switch means, following the first sequential series, the at least one heating element is selectively…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.