Coil spring cassette

A coil spring cassette comprising:

• a partially cylindrical stator housing part, the stator housing part being partially cylindrical in that the stator housing part includes a cylindrical housing part portion and a non-cylindrical housing part portion;
• a cylindrical rotor housing part;
• the rotor housing part is situated coaxially with respect to the stator housing part and the rotor housing part is rotatable relative to the stator housing part;
• a winding gap between by an inner surface of the cylindrical housing part portion of the stator housing part and an outer surface of the rotor housing part;
• a flexible flat cable having at least one electrical conductor;
• a flexible flat ribbon used for mechanical stabilization of the flat cable;
• the flat cable and the flat ribbon are arranged in the winding gap in such a way that their respective first ends are fastened to the stator housing part and their respective second ends are fastened to the rotor housing part and are wound in opposite directions with a respective first section of their length resting against the inner surface of the cylindrical housing part portion of the stator housing part and with a respective second section of their length resting against the outer surface of the rotor housing part, so that a U-shaped turning section which reverses the winding direction is formed in each case between the two respective sections of the flat cable and of the flat ribbon;
• wherein the flat ribbon is a thin steel strip;
• and
• a permanent magnet is mounted in a region of the outer surface of the rotor housing part in such a way that the permanent magnet exerts an attractive effect on the second section of the length of the flat ribbon resting thereon.