Patent ID: 6300605
Filing Date: 2001-10-09
Classification: H05B

Abstract:
A radiant electric heater comprising:a base of thermal insulation material having supported relative thereto at least two concentrically-arranged heating elements separated by a dividing wall of thermal insulation material to form an outer heating zone and an inner heating zone, the heater having a peripheral wall of thermal insulation material;a tunnel formed of thermal insulation material extending between the peripheral wall and the dividing wall across the outer heating zone and such that at least one heating element of the outer heating zone is substantially absent from an area occupied by the tunnel;a rod-like temperature-responsive device extending from a periphery of the heater through the tunnel and at least partly across the inner heating zone, through an aperture provided in the dividing wall;at least one portion of at least one heating element of the inner heating zone extending into the tunnel; andventilation means provided for the tunnel intermediate the ends thereof to reduce temperature within the tunnel to a desired level.