Patent ID: 7556434

Claim:
A bearing structure, comprising: a sphere; a substantially planar base structure having a height smaller than the sphere diameter, said base structure having an opening defined therein and abutted against an outer surface of the sphere at a perimeter thereof, wherein said base structure further includes: (a) a pair of clipping elements receiving said sphere between respective proximal sides thereof, each of said pair of clipping elements having substantially flat opposite top and bottom surfaces, and a side edge extending between said top and bottom surfaces at a distal side thereof, (b) a pair of tightening elements, each having respective top and bottom surfaces and abutting against said side edge of a respective one of said pair of clipping elements, and (c) a pair of substantially planar covering elements sandwiching said pair of clipping elements and said pair of tightening elements therebetween, each of said pair of covering elements having an opening formed therein, wherein, when said each substantially planar covering element is attached to a respective one of said top and bottom surfaces of said pair of clipping elements and in contact with a respective one of said top and bottom surfaces of said pair of tightening elements, a respective portion of said sphere extends externally said base structure beyond each of said pair of substantially planar covering elements through said opening formed therein; and a plurality of adjusting elements disposed at two opposite edges of the base structure in operative coupling with each of said pair of tightening elements, said adjusting elements adjusting a distance between said clipping elements, thereby adjusting the elasticity between the sphere and the base structure, thereby permitting a substantially unrestricted rotation of the sphere in the base structures, thus resulting in a bearing structure with a universal rotating angle.