Abstract: The innermost of two telescoping sub-portions of the steering shaft of an adjustable-length, tiltable steering column is received within the outermost shaft sub-portion, as is a wedge plug which interacts with the innermost sub-portion to wedgingly lock the linkage in adjusted, telescoped position when a threaded actuating rod is turned in one direction. The rod is interlocked with the innermost shaft sub-portion or the wedge plug to prevent relative axial movement between the rod and innermost shaft sub-portion or plug at least when the rod is turned in the other direction.

Abstract: An extensible support structure comprising a housing formed of a pair of U-shaped members arranged to form an elongated passageway which telescopically receives a third member characterized by a cam member extending through aligned apertures in the first and second member and slots in the third member, overcenter means received in the housing and coacting with the cam member to urge it into a first position clamping the first and second members onto the third member to frictionally lock the third member in a selected axial position within the housing and a second position releasing the clamping engagement and the frictional lock of the third member.