Combination drill and screwdriver

Claim 1

A combination device for use with a drive means for forming holes in wallboard material and the like and for driving screws, said device comprising: an elongated core having a forward end, and a rearward end; means for forming a first hole, said means having a plurality of equally spaced wings formed on said forward end, said wings separated by valleys, each said wing having a first portion extending radially outwardly and away from said forward end and each said wing having a second portion extending rearwardly from said first portion, the junction of each said first wing portion and each said valley forming an abrading edge for removing wallboard material when said device is rotated and is pressed with a first axial force directly into engagement with wallboard and rotated to form a first hole having a first diameter; stop means for resisting further penetration by said core into said wallboard when said first axial force is applied to said device, said stop means comprising an annular surface extending radially outwardly from said core, said annular surface spaced a first distance from said forward end; a shank section between said first hole forming means and said annular surface, a portion of said shank section having a reduced cross section for relieving abraded wallboard material when forming said first hole; a counterbore surrounding said core and axially displaced rearwardly from said annular surface, said counterbore for forming a second hole having a second diameter; said stop means being pushable through said wallboard when said device is subjected to a second axial force, whereby said counterbore engages said wallboard to form said second hole; and means formed on said rearward end for connection to said drive means.