Rotary cutting tool, and tool driver and holder.

摘要

A tool driver and holder for rotary cutting tools, such as reamers and drill bits, comprises a shank member (10) having a cylindrical portion (11) projecting axially from one end thereof and this cylindrical portion (11) has at least two tool securing and driving spline members (12) projecting longitudinally from the end thereof remote from the shank (10). These spline members have arcuate outer faces (21) and radially inwardly extending side faces merging into a convex inner face to provide a central axial gap and symmetrically disposed radial gaps therebetween. A cylindrical sleeve member (14) is rotatably mounted on the cylindrical portion (11) and splines (12) and this sleeve member (14) has at the outer ends thereof radially inwardly projecting tool holding tab members (15). The sleeve (14) and associated tab members (15) are positionable between a tool securing and a tool releasing position.

The tool holder is adapted to receive a symmetrical reversible fluted cutting tool (19) of generally cylindrical outer configuration having curvilinear flutes formed in the outer face thereof symmetrically disposed about and extending the length of the tool body, defining peripheral lands between the flutes, retaining indentations (29) formed in the lands at the mid point of the tool body, and cutting edges formed in both end regions of the tool.