Hollow annular drill bit with hollow cylindrical carrier member

Details Hollow annular drill bit with hollow cylindrical carrier member Hollow annular drill bit with hollow cylindrical carrier member

B - Operations, Transporting

28

D

B28D 1/14 (2006.01) B28D 1/04 (2006.01) B28D 1/26 (2006.01)

Patent

CA 2160044

A hollow annular drill bit is formed of an axially extending hollow cylindrical carrier member and cutter members. The cutter members are secured in recesses in the carrier member, so that they project axially from and radially inwardly and radially outwardly from the leading end region of the carrier member. The carrier member has increased wall thickness sections enclosing the recesses, whereby sufficiently large connecting surfaces are available for securing the cutter members.

Outil de forage annulaire creux constitué d'un support cylindrique creux s'étendant dans le sens axial et d'éléments de coupe. Les éléments de coupe sont fixés dans des évidements du support, de sorte qu'ils font saillie axialement et radialement vers l'intérieur et vers l'extérieur à partir de la région du bord d'attaque du support de l'outil de forage. Le support comporte des sections dont la paroi est plus épaisse autour des évidements, ce qui offre des surfaces de raccordement suffisamment importantes pour fixer les éléments de coupe.

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