| 摘要 |
<p>: A tool driver and holder for rotary cutting tools, such as reamers and drill bits, is described, along with rotary cutting tools of a novel design. The driver comprises a shank member having a cylindrical portion projecting axially from one end thereof and this cylindrical portion has at least two tool securing and driving spline members projecting longitudinally from the end thereof remote from the shank. These spline members have arcuate outer faces 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 is rotatably mounted on the cylindrical portions and splines and this sleeve member has at the outer ends thereof radially inwardly projecting tool securing tab members. The sleeve and associated tab members are positionable between a tool securing and a tool releasing position.</p> |
