Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1978-05-08
1980-08-19
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
119 73, 137301, 137341, 138 32, 138 33, 138113, 138116, 219299, 219341, 222146HE, 237 80, F22H 112, A01K 706, F16L 5300
Patent
active
042186072
ABSTRACT:
An animal watering apparatus has an exterior housing with a water pipe disposed therein leading from a below ground source of water under pressure to an above ground outlet valve mechanism which can be actuated by an animal to release water directly into the animal's mouth. A longitudinally extending electric heating element disposed within the housing in immediate heat exchange relationship with one side of the water pipe continually supplies heat to the pipe to prevent freezing of the water therein. Thermal insulation surrounds the heating element and pipe. A circuitous passageway, provided within the heated portion of the pipe by means of an open-ended tubular member disposed therein, causes continuous water circulation in the pipe for preventing build-up of heat at the water outlet valve of the watering device. The tubular member includes a pair of external longitudinal ribs in sealing contact with the interior of the water pipe adjacent to the heating element for forming a convection flow passageway between the interior surface of the pipe and the exterior surface of the tubular member, whereby the hotter water in the pipe rises through the passageway and the cooler water falls through the tubular member to establish the continuous circulation.
REFERENCES:
patent: 2062246 (1936-11-01), Atkinson
patent: 2351544 (1944-06-01), Revard
patent: 2932313 (1960-04-01), Noland
patent: 3784785 (1974-01-01), Noland
patent: 3932727 (1976-01-01), True
patent: 3949707 (1976-04-01), Armstrong et al.
patent: 4069409 (1978-01-01), Noland et al.
patent: 4091261 (1978-05-01), Noland
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