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US 10,477,622 B2Granted
Variable pitch resistance coil heater
AssigneeWatlow Electric Manufacturing Company
InventorsScott Boehmer, Dennis P. Long, Rolando O. Juliano
Life of this patent
Estimating the term…
Abstract
A heater includes a resistance coil, a first conducting pin and a second conducting pin. The resistance coil includes a first end connected to the first conducting pin, and a second end connected to the second conducting pin. The resistance coil defines a first portion adjacent the first end, a second portion adjacent the second end, and a third portion disposed between the first portion and the second portion. At least one of the first, second, and third portions has a continuously variable pitch along its length.
Claims21
A resistance element for use in a heater comprising:
- a resistance coil having a first end and a second end opposing the first end, the resistance coil defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and the second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch and the first and second portions have a constant pitch.
4 more elements
A resistance element for use in a heater comprising:
- a resistance coil having a first end and a second end opposing the first end, the resistance coil defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and the second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch,
- wherein the first, second and third portions have a constant diameter along an entire length of the resistance coil.
5 more elements
A resistance element for use in a heater comprising:
- a resistance coil having a first end and a second end opposing the first end, the resistance coil defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and the second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch,
- wherein the first and second portions have the same constant pitch.
5 more elements
A resistance element for use in a heater comprising:
- a resistance coil having a first end and a second end opposing the first end, the resistance coil defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and the second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the first portion and the second portion have different pitches.
4 more elements
A resistance element for use in a heater comprising:
- a resistance coil having a first end and a second end opposing the first end, the resistance coil defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and the second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch,
- wherein at least one of the first and second portions has a continuously variable outside diameter and a constant pitch.
5 more elements
A resistance element for use in a heater comprising:
- a resistance coil having a first end and a second end opposing the first end, the resistance coil defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and the second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch,
- wherein at least one of the first portion and the second portion defines a taper having a gradually increasing outside diameter along the length from the first end or the second end toward the third portion.
5 more elements
A resistance element for use in a heater comprising:
- a resistance coil having a first end and a second end opposing the first end, the resistance coil defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and the second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch,
- wherein the first portion defines a taper having a gradually increasing outside diameter along the length from the first end to the third portion, and the second portion defines a taper having a gradually increasing outside diameter along the length from the second end to the third portion.
5 more elements
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a resistance coil disposed between the first and second conducting pins, the resistance coil having a first end and a second end opposing the first end and defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch,
- wherein the first, second and third portions have a constant diameter along an entire length of the resistance coil.
8 more elements
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a resistance coil disposed between the first and second conducting pins, the resistance coil having a first end and a second end opposing the first end and defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the first portion and the second portion have different pitches and the pitch of the first and second portions are greater than or smaller than a pitch of the third portion.
7 more elements
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a resistance coil disposed between the first and second conducting pins, the resistance coil having a first end and a second end opposing the first end and defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein at least one of the first and second portions has a continuously variable outside diameter and a constant pitch.
7 more elements
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a resistance coil disposed between the first and second conducting pins, the resistance coil having a first end and a second end opposing the first end and defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein at least one of the first portion and the second portion defines a taper having a gradually increasing outside diameter along the length from the first end or the second end toward the third portion.
7 more elements
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a resistance coil disposed between the first and second conducting pins, the resistance coil having a first end and a second end opposing the first end and defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch,
- wherein the first portion defines a taper having a gradually increasing outside diameter along the length from the first end to the third portion, and the second portion defines a taper having a gradually increasing outside diameter along the length from the second end to the third portion.
8 more elements
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a resistance coil disposed between the first and second conducting pins, the resistance coil having a first end and a second end opposing the first end and defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch and the first and second portions have a constant pitch.
7 more elements
A heater comprising:
- a first conducting pin;
- a second conducting pin;
- and
- a resistance coil disposed between the first and second conducting pins, the resistance coil having a first end and a second end opposing the first end and defining:
- a first portion adjacent the first end;
- a second portion adjacent the second end;
- and
- a third portion disposed between the first portion and second portion,
- wherein at least one of the first, second and third portions has a continuously variable pitch along its length,
- wherein the third portion has a constant outside diameter and a continuously variable pitch,
- wherein the first and second portions have the same constant pitch and the pitch of the first and second portions are greater than or smaller than a pitch of the third portion.
8 more elements
Dependencies are inferred from the claim text.