Patent ID: 7165920

Claim:
A system for attaching an accessory attachment to a rotary hand tool of the type having a generally cylindrical body including a nose end portion, the tool having an output shaft at a nose end thereof, said system comprising: the hand tool nose end portion having a generally cylindrical configuration with a central opening therein, thereby forming a side wall, said side wall having external threads and at least one tapered recess extending from the outer end inwardly in the axial direction, the width of said recess gradually narrowing in the inward direction; the accessory attachment having a generally cylindrical attaching end portion around which a rotatable coupling is positioned, the coupling having limited movement in the axial direction and internal threads configured to engage the external threads of the nose end portion, the attaching end portion having at least one projection extending in the axial direction for engaging said recess during attaching of the accessory attachment to the hand tool to angularly position the accessory attachment before rotating the coupling to secure the attachment to the hand tool.