Abstract

A radiant electric heater comprises a dish-shaped enclosure (1) formed of a first thermal insulation material and having a base (3) and a peripheral wall (5) and at least one upwardly-extending protrusion (7) formed in the base and defining a channel (9) in the base within the peripheral wall. A layer (11) of a second thermal insulation material, having greaterthermal insulation properties than the first thermal insulation material, is provided in the channel. A radiant electric heating element (13) is supported on or in the layer of the second thermal insulation material.

IPC Classes  ?

• H05B 3/74 - Non-metallic plates

Abstract

A temperature sensor for a radiant electric heater includes switch housing (7), first expansion element (3) secured at one end to the housing, and second expansion element (5) mounted such that free ends of the two elements are immovable relative to each other, the two expansion elements having different thermal expansion coefficients. Snap switch (11) is disposed within the housing and includes switch arm (9) provided with electrical contact (15). Electrically conducting support (29) is provided with counter contact (31), and resilient assembly (25, 27) is disposed in the housing and acts between the electrically conducting support and the switch arm and between the electrically conducting support and the end of the second expansion element. The resilient assembly includes spring (27) restrained against lateral movement and electrically insulating spacer (25) positioned between the spring and one of the switch arm and the electrically conducting support so as to electrically isolate the switch arm and the support.

IPC Classes  ?

• H01H 37/48 - Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes