Adjustable bearing

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).