Protective device for telescopic shafts

A protective device for telescopic, rotating shafts comprising:

• an outer protective tube and an inner protective tube which are axially inserted into, and overlap, one another, said tubes are adjustable relative to one another along a longitudinal axis and are made of plastic, said outer protective tube on an inner face including at least three grooves which are open towards the longitudinal axis and which are delimited by pairs of ribs on the outer protective tube, said pairs of ribs extend parallel to the longitudinal axis and project from the inner face, said pairs of ribs are arranged so as to be distributed on a circumference of the inner face around the longitudinal axis, the inner face of said outer protective tube between the pairs of ribs further including at least one guiding web formed on and projecting from the inner face towards the longitudinal axis and said inner protective tube including guiding ribs formed on and projecting radially outwardly from the outer face, said guiding ribs of said inner protective tube corresponding in number to the pairs of ribs of the outer protective tube, said guiding ribs of said inner protective tube are arranged to project between said ribs of respective said pair of ribs, said guiding ribs of said inner protective tube engage with play, in the circumferential direction, the region between said pairs of ribs.