B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 51/00 (2006.01) B23B 31/00 (2006.01) B28D 1/14 (2006.01)
Patent
CA 2399353
An object of the present invention is to provide a drill bit which is simple in design, high in rigidity, and superior in durability and whose drilling function is in no way inferior to that of conventional drilling bits. To this end, in a drill bit comprising a cutting blade tip (2) which is united tightly to a tip end of a bit body (1) and a plurality of cutting blade portions (2a, 2b and 2c) which are formed around the cutting blade tip (2), a flat surface portion (3) is formed in a side surface of the drill bit from between adjacent cutting blade portions to a base portion of the bit body (1) so that the bit body (1) is formed into a straight configuration having an approximately polygonal cross section.
L'invention porte sur un foret ayant la même utilisation qu'un foret traditionnel, de structure simple, d'une grande rigidité et d'une excellente durabilité. Une extrémité (2) de lame de coupe est fixée à l'extrémité du corps (1) principal du foret, une pluralité de parties (2a), (2b) et (2c) de lame de coupe sont formées sur l'extrémité (2) de la lame de coupe, des parties (3) plates sont formées sur des surfaces latérales du foret au niveau d'une section s'étendant d'une section médiane située entre les parties de lame de coupe à une partie de base du corps principal du foret, le corps (1) principal ayant une forme droite, à section transversale généralement carrée.
Kabushiki Kaisha Miyanaga
Kirby Eades Gale Baker
LandOfFree
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