Patent ID: 7407350
Filing Date: 2008-08-05
Classification: B23B,Y10S,Y10T

Abstract:
1. A rotary cutting tool comprising: a cutting head detachably secured to a shank, the cutting head and the shank having mating cylindrical outer surfaces and leading and trailing flute sections, and a common axis of rotation (A) defining a front-to-rear direction and a direction of rotation (R); the cutting head comprising a cutting portion adjacent a cutting head front face and a mounting portion extending rearwardly therefrom; the shank comprising a receiving portion extending rearwardly from a shank front face; the mounting portion and the receiving portion mate in shape and dimensions, each comprising at least two coupling portions bounded by the cylindrical outer surfaces and by the leading and trailing flute sections; each coupling portion comprising a planar base surface extending transversely to the axis of rotation (A), a torque transmission wall extending generally inwardly from the cylindrical outer surface to a cylindrical inner wall, and a fixation wall extending rearwardly from the base surface and circumferentially relative to the axis of rotation (A); each base surface comprising a first base portion extending generally inwardly from the cylindrical outer surface towards the fixation wall, and from the torque transmission wall to the adjacent leading flute section, and a second base portion co-planar therewith, extending inwardly from the cylindrical inner wall to the fixation wall, and circumferentially from the adjacent trailing flute section towards the first base portion; wherein the cutting head coupling portions and the shank coupling portions engage each other, with their fixation walls, their torque transmission walls, their first base portions and their second base portions abutting each other.