Trepanning tool

B - Operations – Transporting – 23 – B

Patent

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77/36

B23B 41/02 (2006.01) B23B 51/04 (2006.01)

Patent

CA 2012678

A trepanning tool having a hollow, cylindrical body having a central axis with a drive means on one end and a means supporting cutting inserts on the other end. The cutting inserts are arranged to cut in groups of three. Each insert has at least one generally straight cutting edge, the second insert of each said group being disposed generally perpendicular to the central insert, the cutting edge of the first and third insert each being disposed at an acute angle in a vertical plane to the cutting edge of the first insert whereby the three inserts cut a concave circular groove as the tool rotates.

Couronne de coupe possédant un corps cylindrique creux à axe central. Elle est équipée d'un mécanisme d'entraînement à une extrémité et d'un moyen de support des plaquettes de coupe à l'autre. Les plaquettes de coupe sont placées de manière à fonctionner par groupe de trois. Chaque plaquette possède au moins un bord coupant généralement droit; la deuxième plaquette de chaque groupe est généralement perpendiculaire à l'axe central; le bord coupant des première et deuxième plaquettes est placé à angle aigu dans un plan vertical par rapport au bord de coupe de la plaquette du milieu. De cette manière, les trois plaquettes taillent une rainure circulaire concave pendant la rotation de la couronne.

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