Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1986-11-05
1989-03-14
Bartis, Anthony
Electric heating
Heating devices
With heater-unit housing, casing, or support means
116252, 219331, 219506, 337361, 337368, 374198, H05B 102, H05B 378, H01H 3752
Patent
active
048126268
ABSTRACT:
A thermostatically controlled electric heater for aquariums includes within an electric waterproof envelope, a heating element and a working unit regulating the temperature, moving axially in order to vary the rest position of a bimetal strip which, depending on its deformation, opens and closes the supply circuit of the heating element. The regulation unit (3) is provided with a threaded pin (13), the end resting against the bimetal strip (7) and with a cylindrical body (11), provided on the side surface with a helical line (12) dividing the surface of the cylindrical body into two differently colored portions (12) covered by a screen (18) provided with a longitudinal slot (19) through which a short portion of said helical line (12) is visible. A grauated scale is provided along the slot and cooperates with the visible portion of the line to indicate the set operating temperature of the heater.
REFERENCES:
patent: 1139185 (1915-05-01), Johnson
patent: 2263988 (1941-11-01), Hardy et al.
patent: 2888537 (1959-05-01), Mears
patent: 3227128 (1966-01-01), Schmidt
patent: 4072847 (1978-02-01), Craven
patent: 4107514 (1978-08-01), Ellson
patent: 4149067 (1979-04-01), Jager
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