Rock drill bit

Details Rock drill bit Rock drill bit

E - Fixed Constructions

21

B

255/83

E21B 10/36 (2006.01) E21B 10/56 (2006.01)

Patent

CA 1221681

Abstract A rock drill bit of the impact type comprising a boring head (11), a shaft (12) having ridges (18), a front sur- face (13) and a number of peripherally spaced holes rece- iving inserts (14), said holes extending forwardly and out- wardly at an acute angle ? with respect to the center line (CL1) of the drill bit (10). The guiding surface (25) of the in- sert (14) mainly coincides with the jacket surface (16) of the bit body (10) when the insert (14) has been fixed in the hole which emerges into both the jacket surface (16) and the front surface (13) of the bit body (10). This means that the guiding surface (25) partly extends on both sides of the plane of the front surface (13). (Fig. 1)

463095

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