Patent ID: 8426779
Filing Date: 2013-04-23
Classification: H05B

Abstract:
1. A cartridge heater comprising: a metal jacket; a dimensionally stable carrier wall consisting of insulating material, the carrier wall having a width coordinated with an internal diameter of said metal jacket; granulated insulating material in the metal jacket; a hot wire coil with two coreless coil strands extending along two sides of said carrier wall, said coil strands being embedded in said granulated insulating material, said hot wire coil having hot wire ends; terminals connected to each of said hot wire ends, said terminals projecting from the same end of said metal jacket, wherein said hot wire coil strands are electrically connected to one another in the area of an end edge of the carrier wall, which said end edge faces a closed end of said metal jacket, said closed end being located away from said terminals; spacers formed of an insulating material, said spacers maintaining, in an insulating manner, said coil strands in a position away from said metal jacket, said spacers being arranged at longitudinal edges of the carrier wall distributed over a length of the hot wire coil; and an attached coil holder at a terminal-side end of said carrier wall, said coil holder being fastened to said hot wire ends under tensile stress and maintaining the windings of the hot wire coil spaced apart, said coil holder having at least one of a filling opening for the granulated insulating material or a contour cooperating with said metal jacket to form a filling passage for the granulated insulating material.