Diffuse-pattern radiant heater with non-parabolic reflector apparatus and method
A radiant heater includes a radiant heat source and a reflector to direct the bulk of the heat generated by the radiant source in one direction. The shape of the reflector determines the radiant pattern of the heater, and generally defocuses the output to provide a diffuse heat pattern that is substantially free of hot spots.
1. A radiant heater, comprising:
a heating element configured to radiate heat;
a first reflector support, a second reflector support, a third reflector support, and a fourth reflector support; and
a reflector located proximate to said heating element, said reflector having a shape that is generally parabolic in cross-section with the exception of having a generally middle portion of said reflector displaced, while a first edge and a second edge of said reflector remain approximately in positions associated with the generally parabolic cross-section, wherein said first and second reflector supports configured as a pair comprise a rod, and said third and fourth reflector supports configured as a pair comprise a rod, around both of which rods said reflector passes in part.
2. The radiant heater of claim 1 , further comprising:
a housing enclosing said at least one heating element and said reflector at least in part, wherein said at least one heating element is generally linear in configuration; and
a deflection fitting so displacing said middle portion of said reflector as to render diffuse a pattern of heat distribution by said radiant heater.
3. The radiant heater of claim 2 , wherein a reflector confirmation established by said reflector with said first, second, third, and fourth reflector supports and said deflection fitting establishes a limit of radiation focusing sharpness.
4. The radiant heater of claim 2 , wherein said deflection fitting comprises a fastener that positions said reflector with respect to said housing.
5. The radiant heater of claim 2 , wherein said deflection fitting comprises a protrusion, wherein said protrusion is affixed to or attached to said housing that positions said reflector with respect to said housing.
6. The radiant heater of claim 2 , wherein a multiplicity of deflection fittings position said reflector.
7. The radiant heater of claim 2 , further comprising an electrical power connection to said at least one heating element.
8. The radiant heater of claim 2 , further comprising a protective grille serving as a barrier over said at least one heating element.
9. The radiant heater of claim 2 , wherein said at least one heating element is a resistive wire spirally wrapped around an insulating core, a resistive ribbon, a resistive element with a fused quartz jacket, or a substantially continuous metallic sheath surrounding a resistance wire, with thermally conductive, electrically insulating material between.
10. The radiant heater of claim 7 , wherein said electrical power connection to said at least one heating element comprises one of an electrical cord, an electrical cord terminated in a plug, an electrical connector affixed to said housing, a set of electrical contacts affixed to said at least one radiant heater, and wires.
11. The radiant heater of claim 2 , further comprising at least one of a base, at least one foot, and a handle.
12. The radiant heater of claim 7 , wherein said electrical power connection further comprises one of a thermal circuit interrupter, a circuit breaker, and a fuse.