CHUCK FOR HOLLOW BASE BODY

摘要

PROBLEM TO BE SOLVED: To provide a chuck capable of keeping the grasp of a hollow base body surely vertical and being used for a dip coating apparatus. SOLUTION: The chuck for a hollow base body is constituted so that a recessed part is provide on a tip part brought into contact with the upper end of the hollow base body and inserted into an upper end opening of the base body, an O-ring is mounted at the inside face forming an outside wall of the tip part in the recessed part and is pressed to be expanded in the outer diameter direction of the tip end part to be in pres-contact with the inner circumferential surface of the hollow base body, a piston having an outside surface forming the bottom surface of the recessed part housing the O-ring is provided inside and the O-ring is guided by the outside wall of the piston to be pressed and expanded while being rotated in the pressing direction in the pressing.