EXTENSIBLE SUPPORT STRUCTURE

摘要

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 rod and cam arrangement extending through aligned apertures in the first and second members and slots in the third member for forcing the first and second members into clamping engagement with the third member to frictionally lock the third member in a selected axial position within the housing. Preferably, each of the members forming the housing has a pair of flat surfaces extending the length which coact with four flat surfaces provided on the third member to provide engagement surfaces through which the clamping force is applied.