Patent ID: 8692163

Claim:
An electrical sleeve heater for heating an elongated part, the sleeve heater comprising: a metallic and tubular casing extending coaxially along an axis with the part and surrounding the part, the casing having a front end and being formed there with a radially inwardly open cutout; a electrical heating element set in the casing and energizeable to heat the casing and the part surrounded by the casing; a thermocouple having a sensing tip in the cutout; and a body of lower thermal conductivity than the casing fitted in the cutout, having an inner surface conforming to a shape of an outer face of the part, holding the tip, and urging the tip radially inward into direct engagement with an outer surface of the part, the cutout having angularly confronting edges formed with grooves receiving ends of the body and opening on the edges only angularly into the cutout.