Device for dancing the twist

Claim 1

A SWIVEL FOOT SUPPORTING PLATFORM FOR USE IN DANCING THE "TWIST" AND OTHER LIKE STEPS COMPRISING A BASE PLATE ENGAGEABLE WITH A FLOOR SURFACE, A FOOT SUPPORTING PLATE RELATIVELY LARGER THAN THE BASE PLATE HAVING LENGTH AND WIDTH DIMENSIONS CORRESPONDING SUBSTANTIALLY TO THOSE OF A PORTION OF THE SOLE OF AN INDIVIDUAL FOOT, FORWARDLY THEREOF, POSITIONED ABOVE THE BASE PLATE IN PARALLEL, CLOSELY SPACED RELATION THERETO AND HAVING MEANS HAVING REMOVABLY AND PIVOTALLY CONNECTING IT TO THE BASE PLATE FOR ROTATIVE MOVEMENT ABOUT A VERTICAL AXIS, THE BASE PLATE AND THE FOOT SUPPORTING PLATE HAVING MUTUALLY OPPOSED ANNULAR GROOVES ARRANGED CONCENTRICALLY RELATIVE TO SAID CONNECTING MEANS, SAID GROOVES HAVING A PLURALITY OF BALL BEARINGS RECEIVED THEREBETWEEN WHEREBY THE FOOT SUPPORTING PLATE IS ROTABLY SUPPORTED ON THE BASE PLATE, AND A RELATIVELY THIN PLANAR MEMBER ARRANGED PARALLEL TO AND BETWEEN THE BASE PLATE AND THE FOOT SUPPORTING PLATE, SAID LAST-MENTIONED PLANAR MEMBER HAVING AN OPENING THEREIN THROUGH WHICH SAID CONNECTING MEANS IS PASSED AND HAVING OTHER CIRCUMFERENTIALLY SPACED OPENINGS EACH HAVING ONE OF THE BALL BEARINGS RECEIVED THEREIN WHEREBY THE BALL BEARINGS ARE SPACED CIRCUMFERENTIALLY RELATIVE TO EACH OTHER.