Rotational coupling device for two telescopic shafts

摘要

The coupling for two telescopic shafts (1,2) comprises a first rotating connection (11) between the shafts which is constituted by a rotational frictional system. A second rotational connection (12) between the shafts is constituted by internal (21) and external (22) flutings. The internal flutings are in the periphery of the interior shaft end and the external flutings are in the internal surface of the outer tube constituting the outer shaft. In normal operation transmission is effected by friction and in exceptional operation the transmission is effected in addition by the flutings.