Electric heating – Heating devices – Resistive element: igniter type
Patent
1981-08-25
1984-05-01
Reynolds., B.
Electric heating
Heating devices
Resistive element: igniter type
4524, 219365, A61H 3306, F24H 920, G05B 102
Patent
active
044463561
ABSTRACT:
Disclosed is an electric sauna heater which includes control and safety apparatus which can include one or more relays (either temperature or current controlled) for switching power to the heating elements of the heater, a thermostat (mechanical or electronic) for controlling the relay(s), a temperature limiter to disconnect power from the heating elements in the event of excessive temperature, sensor elements for the thermostat and temperature limiter and operating controls. The operating controls can include a potentiometer for setting the thermostat, a potentiometer for setting the timer, light-limiting diodes as power indicators, and push buttons for manually energizing and de-energizing the sauna heater. According to the invention, the operating controls are disposed as a separate unit from heater unit and from the remainder of the control and safety apparatus either inside or outside of the sauna room. Conductors are provided to interconnect the operating controls with the remainder of the control and safety apparatus. Also disclosed is circuitry which enables the operating controls to operate at a low voltage of, for example, 12 volts.
REFERENCES:
patent: 2192144 (1940-02-01), Miller
patent: 2556973 (1951-06-01), Nickells
patent: 3007178 (1961-11-01), Altman et al.
patent: 3066668 (1962-12-01), Richter
patent: 3271786 (1966-09-01), Joy
patent: 3275800 (1966-09-01), Kuoppamaki et al.
patent: 3293666 (1966-12-01), Casalini
patent: 3299443 (1967-01-01), Ketola
patent: 3309503 (1967-03-01), Dow et al.
patent: 3422465 (1969-01-01), Jones et al.
patent: 4288854 (1981-09-01), Burroughs
patent: 4293759 (1981-10-01), Higgins
"Installation Plans" by Normandy Products Co., Oct. 1, 1968.
"Solid State Controls" by John Mungenast, Oct. 1967.
Evans Geoffrey S.
Oy Helo Tehtaat
Reynolds. B.
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