Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1975-09-03
1977-08-30
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
4160, 219342, 219364, 219367, H05B 102, F24H 300, F24H 920
Patent
active
040456528
ABSTRACT:
An arrangement for preventing overheating in electric air heaters of the type having a plurality of electric heating elements disposed in a casing defining a vertical air flow path having a lower air inlet and an upper air outlet includes the placement of a temperature sensing device in a vertical air channel located adjacent and external to the casing. The vertical air flow channel communicates with the vertical air flow path intermediate the inlet and outlet via an aperture in the casing wall. A flow duct is provided in the casing below the aperture for preventing, during normal operation of the heater, heated air from the interior of the casing from reaching the sensing device in the air channel. If the outlet of the flow path is obstructed, a portion of the hot air well travel from the casing through the aperture to the sensing device to activate the sensing device to deenergize the heating elements.
REFERENCES:
patent: 2492774 (1949-12-01), Wild
patent: 2849589 (1958-08-01), Lancaster
patent: 3277274 (1966-10-01), Raabe
patent: 3348021 (1967-10-01), Skogland et al.
patent: 3769494 (1973-10-01), Janson
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