Patent ID: 8729433

Claim:
An electrical auxiliary heating device for motor vehicles, comprising: an open housing; a layer structure accommodated in the housing, the layer structure comprising at least one radiator element, at least one heat emitting element, and at least one spring element keeping the layer structure under tension, the spring elements having spring tongues and the heat emitting element having at least one PTC heating element, wherein: a spring counter element is provided adjacent and movable with respect to the spring element and exhibits receptacles formed to accommodate the spring tongues, and wherein the layer structure, the spring element, and the spring counter element are arranged in the open housing stress-free as the spring tongues are arranged in associated receptacles of the spring counter element, and wherein during assembly, the spring counter element interacts with the spring tongues of the spring element such that, through a relative sliding displacement of the spring element against the spring counter element, the spring element is raised with respect to the spring counter element to tension the spring element and put the layer structure under tension.