Accessory tool apparatus for use on power drills

An apparatus for attachment to an electric drill for providing at least one additional tool therefor, the apparatus of the type being selectively attached to the chuck holes of the drill, without requiring removal of a drill bit therein, for rotation of a tool-holding shaft by the drill;

• the apparatus comprising:
• a plurality of balls, each such ball configured for at least partial entry into a respective chuck hole of said drill;
• a ball holder of a hollow, generally cylindrical shape and having a first end for holding said shaft and a second end having sockets for holding said balls against adjacent said chuck holes;
• a housing positioned in coaxial surrounding engagement with the exterior radial surface of said ball holder, the relative axial positions of said housing and said ball holder determining the radial position of said balls within said sockets;
• and
• a spring positioned within said housing for resisting relative axial motion between said housing and said ball holder, a first compression position of said spring corresponding to a radial position of said balls for locking said balls into said chuck holes and a second compression position of said spring corresponding to a radial position of said balls for releasing said balls from said chuck holes;
• and
• a magnet in said shaft for selective retention of a tool therein.

An apparatus for attachment to an electric drill for providing at least one additional tool therefor, the apparatus of the type being selectively attached to the chuck holes of the drill, without requiring removal of a drill bit therein, for rotation of a tool-holding shaft by the drill;

• the apparatus comprising:
• a plurality of balls, each such ball configured for at least partial entry into a respective chuck hole of said drill;
• a ball holder of a hollow, generally cylindrical shape and having a first end for holding said shaft and a second end having sockets for holding said balls against adjacent said chuck holes;
• a housing positioned in coaxial surrounding engagement with the exterior radial surface of said ball holder, the relative axial positions of said housing and said ball holder determining the radial position of said balls within said sockets;
• and
• a spring positioned within said housing for resisting relative axial motion between said housing and said ball holder, a first compression position of said spring corresponding to a radial position of said balls for locking said balls into said chuck holes and a second compression position of said spring corresponding to a radial position of said balls for releasing said balls from said chuck holes;
• and
• wherein said shaft is serrated for increased frictional engagement with said first end of said ball holder.

An apparatus for attachment to an electric drill for providing at least one additional tool therefor, the apparatus of the type being selectively attached to the chuck holes of the drill, without requiring removal of a drill bit therein, for rotation of a tool-holding shaft by the drill;

• the apparatus comprising:
• a plurality of balls, each such ball configured for at least partial entry into a respective chuck hole of said drill;
• a ball holder of a hollow, generally cylindrical shape and having a first end for holding said shaft and a second end having sockets for holding said balls against adjacent said chuck holes;
• a housing positioned in coaxial surrounding engagement with the exterior radial surface of said ball holder, the relative axial positions of said housing and said ball holder determining the radial position of said balls within said sockets;
• and
• a spring positioned within said housing for resisting relative axial motion between said housing and said ball holder, a first compression position of said spring corresponding to a radial position of said balls for locking said balls into said chuck holes and a second compression position of said spring corresponding to a radial position of said balls for releasing said balls from said chuck holes.

An apparatus for attachment to an electric drill for providing at least one additional tool therefor, the apparatus of the type being selectively attached to the chuck holes of the drill, without requiring removal of a drill bit therein, for rotation of a tool-holding shaft by the drill;

• the apparatus comprising:
• a plurality of balls, each such ball configured for at least partial entry into a respective chuck hole of said drill;
• a ball holder of a hollow, generally cylindrical shape and having a first end for holding said shaft and a second end having sockets for holding said balls against adjacent said chuck holes;
• a spring-biased exterior housing having means for controlling the respective radial positions of said balls for selective locking and unlocking said balls relative to said chuck holes depending upon the relative axial position of said housing and said ball holder;
• and
• a stabiizing sleeve positioned along the exterior radial surface of said housing and adapted for rotational slippage relative to said housing for grasping of said apparatus during rotation of said drill.

An apparatus for attachment to an electric drill for providing at least one additional tool therefor, the apparatus of the type being selectively attached to the chuck holes of the drill, without requiring removal of a drill bit therein, for rotation of a tool-holding shaft by the drill;

• the apparatus comprising:
• a plurality of balls, each such ball configured for at least partial entry into a respective chuck hole of said drill;
• a ball holder of a hollow, generally cylindrical shape and having a first end for holding said shaft and a second end having sockets for holding said balls against adjacent said chuck holes;
• a spring-biased exterior housing having means for controlling the respective radial positions of said balls for selective locking and unlocking said balls relative to said chuck holes depending upon the relative axial position of said housing and said ball holder;
• and
• a magnet in said shaft for selective retention of a tool therein.