Variable pitch resistance coil heater
AssigneeWatlow Electric Manufacturing Company
InventorsScott Boehmer, Dennis P. Long, Rolando O. Juliano
Life of this patent
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Abstract
A heater includes a first conducting pin, a second conducting pin, and a plurality of resistance coils. Each resistance coil includes a first end connected to the first conducting pin and a second end connected to the second conducting pin. At least one resistance coil among the plurality of resistance coils has a continuously variable pitch. In one form, the plurality of resistance coils are connected in a parallel circuit with the first and second conducting pin. A first resistance coil among the plurality of resistance coils may have a diameter that is different than a second resistance coil among the plurality of resistance coils.
Claims20
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a plurality of resistance coils, each resistance coil including a first end connected to the first conducting pin and a second end connected to the second conducting pin,
- wherein at least one resistance coil of the plurality of resistance coils has a continuously variable pitch.
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a plurality of resistance coils connected in a parallel circuit with the first and second conducting pins such that each resistance coil includes a first end connected to the first conducting pin and a second end connected to the second conducting pin,
- wherein the plurality of resistance coils are aligned along a first direction to define a plurality of heating zones,
- wherein a first resistance coil of the plurality of resistance coils has a continuously variable pitch or a diameter that is different than a second resistance coil of the plurality of resistance coils.
Dependencies are inferred from the claim text.