Patent ID: 7207721

Claim:
An adjustable bearing comprising of a top plate ( 1 ), a top seat ( 2 ), a ball hinge ( 3 ), a stud ( 4 ), a locking nut ( 5 ), a stud seat ( 6 ) and a locking screw ( 52 ); said stud seat ( 6 ) is a hollow cylindrical holder with a flange ( 64 ) at its bottom and threads ( 61 ) on its inner wall, on the top surface of the hollow cylindrical holder are equally disposed at least two threaded holes ( 62 ) for receiving screws, and on the flange ( 64 ) are equally disposed several elongated positioning apertures ( 63 ); outer threads ( 43 ) of the stud ( 4 ) are matched with the inner threads ( 61 ) of the stud seat ( 6 ), thus the stud ( 4 ) may be screwed into the stud seat ( 6 ) at a position of height within a certain range, and at the upper end of the stud ( 4 ) is disposed a central recess ( 41 ) and on the outside wall at the upper portion of the stud is disposed an inserting hole ( 42 ) for adjustment; inner threads of the locking nut ( 5 ) being engaged with the outer threads ( 43 ) of the stud ( 4 ), thus the locking nut ( 5 ) is able to screw onto the stud, screw holes ( 51 ) disposed on the locking nut ( 5 ), corresponding to the threaded holes ( 62 ) disposed on the hollow cylindrical holder are provided for receiving the locking screw ( 52 ) in order to keep the locking nut ( 5 ) and the stud in a locking connection; an upper block ( 31 ) having a convex spherical surface at the central portion of its lower end and is inlaid in a recess ( 21 ) at the lower central portion of the top seat ( 2 ), and a lower bearing seat ( 32 ) having a concave spherical surface pit is set in the recess ( 41 ) at the central portion of the upper end of the stud ( 4 ), the spherical surface of the aforesaid upper block ( 31 ) being engaged with a spherical bowl formed by the concave spherical surface pit of the aforesaid lower bearing seat ( 32 ) to become a ball hinge ( 3 ); said top plate ( 1 ) is placed on the top seat ( 2 ).