Abstract: A projectile machine for use in practicing various activities including the practice of basketball shots from various positions on a basketball court. The projectile machine when practicing basketball shots automatically returns the basketballs to the person practicing shots thereby eliminating the necessity for the practicing player or other players to retrieve the basketballs that have been shot and return them to the player practicing the shots. More specifically, the present invention enables basketballs that have been shot towards the basketball goal or hoop to be automatically collected and mechanically returned to a selected on-court location at varying elevations, trajectories and velocities. The projectile machine can also be used during various activities relating to the practice of various endeavors in which an article is projected in a desired trajectory. The projectile machine may be supported from a support post for the backboard and goal for use as a home unit.

Abstract: The collet-type drill includes improved clamping means having a pressure foot member that is in engagement with the work piece. The pressure foot member is connected with a drill motor and with a feed means. A collet is operably connected to and movable relative to the foot member, and when actuated, connects the drill to the work piece. A clamp bushing has one end pivotally connected with the collet and encircles a cylindrical sleeve that has a transverse slot extending therethrough. The bushing is connected to the pressure foot member. A clamping piston extends through the sleeve and carries a connecting pin that extends through the slot in the sleeve into the clamp bushing whereby the bushing and collet are movable together in response to movement of the clamping piston to force the collet into holding engagement with the work piece.