The invention relates to a telescopic sistea the type comprising TWO MEMBERS PLUGGED one another, GIFTED ZONES KNURLED longitudinally intermesh, ensuring their interlocking IN GIRO, ONE OF WHICH PROVIDES at least one projection facing the other , arranged to abut at least one of the longitudinal ribs THIS LAST, SO THE POSTING OF ONE OF THOSE MEMBERS TO THE INTERIOR OF OTHER CAN ONLY OCCUR by deforming said rib under the action of AQUEL OUTGOING, AND BASICALLY CHARACTERIZED because one of the members expressed coaxial with the steering wheel and is rigidly secured thereto, WHILE THE OTHER MEMBER IS SUPPORTIVE OF MAIN STEERING SHAFT, extending it axially.
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