Pull stud bolt installation and removal tool and tubular body manufacturing method thereof

A pull stud bolt installation and removal tool, which is coupled with a torque wrench which is a tool for installing or removing a pull stud bolt onto or from a tool holder used in a machine tool, and which transfers rotational force of the torque wrench to the pull stud bolt when the pull stud bolt is inserted thereinto, the pull stud bolt installation and removal tool comprising:

• a tubular body comprising an inner cylinder into which a knob and a knob lower connecting rod of the pull stud bolt are inserted, and a plurality of locking ball retainer sockets disposed radially to pass through a side surface of the inner cylinder, the locking ball retainer socket being inclined downward toward an inside;
• a locking ball that is movably inserted into the locking ball retainer socket, moves toward an inside of the inner cylinder, comes into contact with the pull stud bolt to restrain the pull stud bolt from being released from the tubular body, and moves toward an outside of the inner cylinder to allow the pull stud bolt to be released from the tubular body;
• a locking sleeve that is coupled with an outside of the tubular body, is movable in a longitudinal direction of the tubular body, and when moving upward, comes into contact with the locking ball moving inside the tubular body, such that the locking ball maintains a locking position preventing the pull stud bolt from being released from the tubular body, and when moving downward, allows the locking ball to move in an outward direction of the tubular body;
• an elastic body that elastically presses the locking sleeve upward;
• and
• a support cover that is coupled with a lower end portion of the tubular body and supports another end portion of the elastic body so that one end of the elastic body presses the locking sleeve.