Device for transferring a signal between two end points which are movable relative to each other

A device for transferring a signal between two end points between which a coiled conductor is arranged, the device comprising:

• a substantially circular cassette enclosing said conductor, said end points permitting attachment of extending conductors at the two end points, the length of said conductor being substantially greater than the distance between said two points, and at least one of the two end points being movable relative to the other, the cassette comprising a stationary stator and a rotor rotatable relative to the stator;
• a holding element connected to a first part of said cassette, said holding element being activatable under spring force to act, in an assembled position of said cassette, on a second part of said cassette to hold the two parts fixed in a predetermined position relative to each other;
• and
• wherein said holding element can be loosened by a rotation of said rotor against said spring force so that, in an operating position of the cassette, said holding element is separated with clearance space from said second part of said cassette.