Patent ID: 7607871

Claim:
A rotary tool holder comprising: (a) a drive shaft configured to be rotated by a machine tool; (b) a tool-bit holding mechanism positioned within said rotary tool holder for positioning a tool-bit within a tool-bit depth limiting nosepiece; (c) biasing means for biasing said tool-bit holding mechanism away from said drive shaft in a forward direction extending toward a work-piece; (d) and wherein said tool-bit depth limiting nosepiece has a first coupling means for rigidly attaching said tool-bit depth limiting nose piece to a forward portion of said rotary tool holder in a manner causing said tool-bit depth limiting nosepiece to rotate along with said rotary tool holder, and having a nosepiece passageway for permitting said tool-bit to pass through said tool-bit depth limiting nosepiece passageway and protrude from said tool-bit depth limiting nosepiece; (e) positioning means for adjusting and fixing a desired protrusion distance that said tool-bit is able to protrude from said tool-bit depth limiting nosepiece; and (f) second coupling means for rotationally coupling the drive shaft to a rearward portion of the rotary tool holder while enabling said tool-bit to slide axially in relation to the drive shaft, whereby the tool-bit depth limiting nosepiece, coupled to a forward portion of said tool holder by said first coupling means, is also able to slide axially relative to said drive shaft, thus preventing said tool-bit depth limiting nosepiece from functioning as a hard stop.