Patent ID: 8226456

Claim:
A power tool packing apparatus run through by an output shaft of a power tool, the output shaft including a distal end connected to an application tool, the packing apparatus providing a packing force to form a compact coupling between the application tool and the output shaft, and the packing apparatus comprising: a pressing disk including an engaging surface in contact with the application tool, a force applying surface on another side opposite to the engaging surface, and an orifice in the center; a crank set including a sleeve run through by the output shaft and a plurality of pins extended radially, the sleeve running through the orifice to couple with the crank set and the pressing disk; a movable wheel and a plurality of steel balls, the movable wheel including an opening run through by the crank set for coupling therewith, a plurality of anchor troughs, a plurality of pin movable notches, a plurality of spring holding troughs and a plurality of retraction notches abutting the anchor troughs; the steel balls being held in the anchor troughs between the movable wheel and the force applying surface of the pressing disk, the pins running through the pin movable notches, the spring holding troughs holding a plurality of compression springs which provide elastic forces to confine the steel balls between the anchor troughs and the pins so that the steel balls provide a packing force on the force applying surface such that when the movable wheel is turned by a user, the steel balls slide into the retraction notches and move away from the force applying surface to provide the pressing disk an inward retraction room.