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AssigneeKennametal Inc.
InventorsHorst Jager, Berthold Zeug
Estimating the term…
A twist drill or drill/chamfer tool that comprises a drill (1) with a shaft section (2) that is provided with a twisted flute, and a clamping ring (4) as the retainer of a facing cutter (5). Said clamping ring tubularly encloses the shaft section (2) or the drill shaft (30) and can be fixed thereon in different axial adjustable positions. The clamping ring (4) can be tensioned on the drill (1) by means of tension screws (6) that extend therethrough substantially radially to the axis (7) of the drill. The tension screws (6) impinge the surfaces of the twisted flutes (9, 10) which are enclosed by the clamping ring (4) indirectly with a clamping shoe (19, 20) that is interposed in a twisted flute (9, 10).
A twist drill for drilling, with a clamping ring (4) that surrounds the spiral fluted shaft portion (2) of the drill (1) on which said clamping ring (4) can be mounted in any axial adjustment position as a holder for a countersink drill or a countersink cutter body (5), where the clamping ring (4) is braced, by means of a locking screw (6) that penetrates it essentially radially, against the surfaces of the spiral flutes (9, 10) tunneled through by the clamping ring (4) or which form tunnels with and run through the clamping ring (4), and a clamping shoe (19, 20) is positioned between the locking screw (6) and the surface of a spiral flute (9, 10).
Cutting-chamfering tool with a clamping ring (4) that surrounds the spiral fluted shaft portion (2) of a drill (1) on which said clamping ring (4) can be mounted in any axial adjustment position as a holder for a countersink drill or a countersink cutter body (5), where the clamping ring (4) is braced, by means of a locking screw (6) that penetrates it essentially radially, against the surfaces of the spiral flutes (9, 10) tunneled through by the clamping ring (4) or which form tunnels with and run through the clamping ring (4), and a clamping shoe (19, 20) is positioned between the locking screw (6) and the surface of a spiral flute (9, 10).
Tool as claimed in one or more of the preceding claims, characterized by the fact that the chip deflecting end (27′) at its side facing the clamping ring (4) and projecting beyond the spiral flute (9, 10) and the counter-flank (37) of the spacer rib (28), forms an acute angle (35), which closes in the direction of rotation (34) of the drill.
Dependencies are inferred from the claim text.