B - Operations – Transporting – 28 – D
Patent
B - Operations, Transporting
28
D
B28D 1/14 (2006.01) B28D 1/04 (2006.01) B28D 1/26 (2006.01) E21B 10/48 (2006.01)
Patent
CA 2160042
A drilling bit includes a carrier member shaped, for instance, as a hollow annular crown. In such a crown several cutter members are distributed angularly apart around the circumferentially extending leading end of the carrier member. The cutter members project both radially outwardly and inwardly from the wall thickness of the carrier member. A step (S) is formed in the cutter members spaced from the leading end thereof in the drilling direction. The step(S) is located at the trailing end of a region (K) with a continuous reduction in the radial dimension (R) of the cutter member and the radial dimension is further reduced at the step. Due to the further reduction in the radial dimension at the step (S), the length of the cutter member in the drilling direction, causing friction with the wall surface of the borehole to be drilled, is limited after extended use of the drilling bit, so that the drilling bit retains a higher drilling efficiency even after such extended use.
La présente invention a pour objet un outil de forage comportant un porte-outil ayant la forme, par exemple, d'une couronne annulaire. Dans cette couronne, plusieurs outils de forage sont régulièrement espacés à l'extrémité de travail du porte-outil. Les bords d'attaque des outils de forage sont en prolongement radial vers l'extérieur et vers l'intérieur de l'épaisseur de la paroi du porte-outil. Un gradin (S) est formé dans les outils de forage à une certaine distance du bord d'attaque dans la direction du forage. Le gradin (S) est situé à l'extrémité arrière d'une région (K) correspondant à une zone de réduction continue de la dimension radiale (R) de l'outil de forage, la dimension radiale atteignant son minimum au niveau du gradin. Du fait de la réduction de la dimension radiale au niveau du gradin (S), la longueur de l'outil de forage dans la direction du forage, source de friction entre celui-ci et les parois du trou à forer, se trouve réduite après une certaine période d'utilisation de l'outil de forage, ce qui permet à l'outil de forage de conserver plus longtemps son efficacité de coupe.
Kleine Werner
Gierczak Eugene J. A.
Hilti - Aktiengesellschaft
LandOfFree
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