CHUCK COLLAR FOR HOLLOW PILE CHUCKING DEVICE

摘要

PROBLEM TO BE SOLVED: To easily mount a chuck collar to a chucking member. SOLUTION: A pin 19a is protrusively provided at each of the upper faces and lower faces of a plurality of collar members 19, and the pin 19a is inserted in an oblong hole 20a formed in a connecting member 20 to be radially movably supported.