Electric resistance heating devices – Heating devices – Convection space heater
Patent
1994-12-28
1998-10-20
Jeffery, John A.
Electric resistance heating devices
Heating devices
Convection space heater
219480, 219508, F24H 302
Patent
active
058259740
ABSTRACT:
An electrical heating apparatus, for example, a fan heater, comprises at least an electrical heating element (14) and a motor (14) for driving a fan. The apparatus also comprises a switch device arranged to provide the apparatus with two operating modes. In the first mode the heating element and the motor are connected in parallel, and in the second mode the heating element and the motor are connected in series. The first mode provides a relatively high heat output and/or high airflow to distribute the heat quickly. The second mode provides quieter operation at a similar or lower output power level, for example, to maintain a given temperature while causing less disturbance to people in the vicinity of the fan heater. A further heating element may be arranged in parallel with the motor in the second mode of operation so as to provide a potential divider for supplying the motor.
REFERENCES:
patent: 1574343 (1926-02-01), Frederics
patent: 1607195 (1926-11-01), Gross
patent: 2552470 (1951-05-01), Wahlberg
patent: 2647198 (1953-07-01), Lautner
patent: 4110600 (1978-08-01), Spotts et al.
patent: 4912300 (1990-03-01), Hennuy et al.
Hingley Richard
Hutton Duncan N.
Franzblau Bernard
Jeffery John A.
U.S. Philips Corporation
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