Heater safety control

Details Heater safety control Heater safety control

1976-05-06

1978-01-10

Albritton, C. L.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

134 57D, 134 58D, 219334, F24H 100

Patent

active

040681149

ABSTRACT:
A receptacle such as a dishwasher tub having an improved control for effecting filling of the tub to a preselected full level and protecting the apparatus against undesirable overfill in the event the normal flow control malfunctions. The flow control includes a control valve having two valve elements for cooperatively preventing such undesirable overfill. One of the valve elements may be controlled by an electrically operated solenoid, and the other valve element may be controlled by mechanical control structure. In the illustrated embodiment, the electrically controlled valve element is controlled by a timer, and the mechanically controlled valve element is controlled by a float. A heater is provided for heating liquid in the tub and an improved control is provided for controlling the heater so as to prevent energization thereof whenever the sensed liquid volume in the tub is below a preselected minimum. Illustratively, the volume is sensed by a float sensing the level of liquid in the tub and connected to a switch of the control for selectively energizing the heater.

REFERENCES:
patent: 2877778 (1959-03-01), Kilby
patent: 3160170 (1964-12-01), Sampsel
patent: 3331374 (1967-07-01), Stewart et al.
patent: 3600602 (1971-08-01), Yartz
patent: 3846615 (1974-11-01), Athey et al.

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