Abstract: A telescopic column is movable along and installed between a flooring sill rail and a ceiling rail. The column has an upper set of wheels engaging the upper rail and a lower set of wheels engaging the lower sill rail, for guiding the column along the rails. A crimping head according to the invention is provided at both extremities of the column, for anchoring at selected intervals a number of vertical studs on the bottom sill rail and on the upper ceiling rail. Each crimping head is positioned inside the C-shaped corresponding rail, and the studs are positioned so that each crimping head is flanked on both sides by two adjacent rail and stud walls. Each crimping head comprises two knives which can pivot in opposite directions away from the column, so as to pierce simultaneously both the rail and stud walls, thus creating outturned complementary lips and a stud window engaged by the lips so as to prevent relative movement of the stud and the rail.

Abstract: A circular stage platform capable of accommodating one to four dancers is cyclically, vertically reciprocable, a distance of about three feet within a cage which encloses the dancers, the latter remaining visible to the spectators. The system is used in nightclubs or the like.