Relay device for rotating members

A relay device comprising:

• a first rotor having an inner cylinder with an axial end;
• a second rotor having an outer cylinder surrounding said inner cylinder at a distance to provide an annular space between the inner and outer cylinders, one of said first and second rotors being immovable while the other of said first and second rotors is rotatable within a predetermined rotational span;
• a flexible flat cable accommodated in the annular space, said flexible flat cable being spirally wound and having one end portion carried by said inner cylinder and another end portion carried by said outer cylinder;
• and
• a cover attachable to the axial end of said inner cylinder so that the one end of said flexible flat cable is drawn out of said annular space;
• said inner cylinder having shroud part for retaining said one end portion of said flexible flat cable therein;
• and
• skid cover having a press part engageable with said shroud part to force said one end portion of said flexible flat cable against said inner cylinder when said cover is attached to said inner cylinder.