Electrically heated portable lunch box

Claim 1

A food storage chest comprising a chest having a pair of adjacent thermally and electrically insultated chambers separated by an insulated partition, an inner lid for each of said chambers, an outer housing and an outer cover enclosing said chambers, one of said chambers being for storing food in cold condition and the other of said chambers having electric heating means, said heating means comprising a first pair of terminals across which the main voltage is applied, a transformer having primary and secondary windings, an electric switch connected between the first pair of terminals and the primary winding, a second pair of terminals and a rectifier bridge connected between the secondary winding and the second pair of terminals, including a third pair of terminals and a plug connected to said third pair adapted for connection to a cigarette lighter socket in an automobile, in further combination with an electric coil heater and a power selector switch for serially connecting the second or third pair of terminals to the coil heater, further including a heat selector switch in series with the power selector switch, said coil heater comprising a plurality of coils in electrical parallel arrangement connected to corresponding heater terminals, said heater selector switch having a plurality of positions wherein one or more of said coils may be connected to the power source switch.