Carrier for a motor-vehicle roof

Carrier for a motor-vehicle roof, comprising:

• a bar (1) having end portions and a longitudinal guide rail (3) provided at least along each of said end portions,
• two bar supporting legs (6, 60), which are to be supported on a roof of a motor-vehicle with the bar (1) arranged transversely to the longitudinal direction of the motor-vehicle, each of said legs (6, 60) being slidably mounted within a respective one of said guide rails on said bar (1), and
• screw-and-nut control means (4, 7) operatively interposed between said bar (1) and each of said legs (6, 60) for controlling movement of each leg (6, 60) along the respective guide rail,
• wherein said screw-and-nut control means comprises:
• a threaded longitudinal end channel (4) formed within each end portion of said bar (1),
• two threaded members (7), each screwed into a respective one of said threaded end channels (4) of the bar (1) and operatively connected to the respective bar supporting leg (6, 60) with respect to movements along the longitudinal direction of the bar,
• means (9, 20) for rotating each of said threaded members (7), to move each threaded member (7) axially within the respective threaded end channel (4) and to move the corresponding leg (6, 60) longitudinally along said guide rail.