Importance

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Abstract

An electric heater (10), especially for heating surfaces of components, over which the electric heater (10) is pushed or on which it is placed, is provided with an inner jacket (21) and an outer jacket (22), which form a double-walled tube, wherein said double-walled tube (20) has a recess (24), which passes completely through the inner jacket (21) and the outer jacket (22), in the direction in which the electric heater (10) extends, and which is delimited by wall surfaces (25, 26) from the space (23) between the inner jacket (21) and outer jacket (22). The heater (10) has at least one tubular heating element (11), which has a metal jacket, and which is arranged in the space (23) between the inner jacket (21) and outer jacket (22). The inner jacket (21), the outer jacket (22) and the wall surfaces (25, 26) are contiguous and are formed of a single piece of material. A process for manufacturing an electric heater is provided including either the steps of inserting a tubular electric heating element into a provided section of a metal strip, whose side edges are connected to one another, and joint shaping of at least the heating element and metal strip into a double-walled tube with a recess passing through the inner jacket and outer jacket of the double-walled tube or the steps of providing a double-walled tube with an inner jacket and an outer jacket, which has a recess, which passes completely through the inner jacket and the outer jacket, in the direction in which the electric heater extends, and which is delimited by wall surfaces from the space between the inner jacket and outer jacket and in which the inner jacket, the outer jacket and the wall surfaces are formed from a single piece of material, and inserting the tubular heating element into an insertion opening provided on the front side of the double-walled tube.

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First Claim