Patent ID: 6402625
Filing Date: 2002-06-11
Classification: A63G

Abstract:
A motion linkage apparatus having an x axis, a y axis and a z axis, each of which axes is perpendicular to each other, said apparatus comprising:(a) a base having a central leg substantially in the â€œzâ€  axis; (b) at least three shaft and ball assemblies associated with the central leg, each assembly comprising: (i). ball having a spherical outer surface and a centreline parallel to the â€œx-yâ€  plane; and (ii). a rotating shaft fixed to the ball parallel to but offset from the centreline of the ball; wherein the axes of the shafts converge on a centre point and radiate outward from the leg and wherein rotation of the shaft displaces the ball eccentrically about the axis of the shaft; and(c) a platform which has an outer circumference and at least three receptacles, wherein each receptacle engages a corresponding ball such that movement of each ball causes movement of the platform; and (d) means for independently rotating each shaft associated with the base or leg.