Drill, especially a forstner bit or a multi-spur machine bit

B - Operations – Transporting – 27 – G

Patent

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Details

B27G 15/00 (2006.01)

Patent

CA 2401134

The invention relates to a drill, especially a Forstner bit or a multi-spur machine bit, having a drill shaft (2) and a cutter head (4) which is provided with a central mandrel (1). A first and a second spur cutter (100, 100') radially extend towards the outside from said mandrel and in opposite tool approach directions. A hollow cylinder segment-like wall (10) respectively that has a circumference cutter (8) and defines the circumference of the cutter head (4) is joined to the ends of the first and second spur cutter (100, 100'), whereby said ends face the circumference. Said wall defines a chip space (7) on the end thereof that faces away from the spur cutter (100, 100'). Said space opens to the respective remaining spur cutter and penetrates the drill head. The two circumference cutters (8) are provided with wave-shaped cavities (13) and elevations (14), at least partially along the side thereof.

L'invention concerne une mèche, en particulier une mèche Forstner ou à pointe de centrage, qui comprend une tige de mèche (2) et une tête de coupe (4), laquelle présente une pointe (1) centrale à partir de laquelle une première et une seconde partie faciale de coupe (100, 100') s'étendent radialement, dans des sens d'entrée en contact opposés, vers l'extérieur. Sur les extrémités situées côté périphérie de la première et de la seconde partie faciale de coupe (100, 100') se trouve, respectivement, de façon adjacente, une paroi (10) du type segment de cylindre creux, qui comporte une partie de coupe périphérique (8) et délimite la périphérie de la tête de coupe (4). Cette paroi délimite, à son extrémité éloignée des parties faciales de coupe (100, 100') un espace à copeaux (7) qui s'ouvre respectivement sur l'autre partie faciale de coupe et qui traverse la tête de mèche, les deux parties de coupe périphériques (8) présentant, au moins partiellement, le long de leur tracé, des creux (13) et des élévations (14) formant des ondulations.

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