Cutting tool with replaceable edge cutting bit

Cutting tool to hold a replaceable, rotatable cutting bit (6) having

• a cutter body (1) formed with
• a plane support surface (3) to support the bit (6);
• lateral abutment surfaces (4, 5) to position the bit thereagainst;
• a bore (10) extending into the cutter body from the support surface in a direction at least generally perpendicular to the support surface and being formed with an enlarged recess portion (19);
• and a clamping bolt (12) to releasably clamp the bit (6) on the support surface and against the abutment surfaces, screwed into the bore (10), said clamping bolt having an at least part-conical clamping head (13, 14, 15) fitting into a clamping opening (8, 9) formed in the bit, and an enlarged conical intermediate portion (25), radially projecting from the shank (25a, 25b) of the bolt and fitting into the enlarged recess portion (19) of the bore (10) in the cutter body (1);
• and wherein, in accordance with the invention,
• the enlarged portion (19) is of elongated shape having a length which is greater than the diameter of the conical intermediate portion (25) of the clamping bolt (12),
• a subportion of said enlarged conical portion extending over part only of said enlarged portion having circular cross section and a circle axis which coincides with the axis (17) of the bore (10) to provide for part-circumferential surface guidance of the conical intermediate portion (25) of the bolt (12);
• and wherein the length axis (24) of the elongated enlarged portion extending transverse to the axis (17) of the bore is directed towards at least one of the lateral abutment surfaces (4, 5) of the body to draw the bit, upon tightening of the bolt (12) in the bore, against the support surface and against the abutment surface, the elongated enlarged portion permitting resilient deflection of the bolt between the part thereof which is screwed into the bore and the clamping head.