Rock drilling press

Details Rock drilling press Rock drilling press

E - Fixed Constructions

21

B

E21B 10/38 (2006.01) B23B 51/06 (2006.01) E21B 17/00 (2006.01) E21B 17/03 (2006.01)

Patent

CA 2364527

A rock drilling tool including a tip formed of a hard material and provided at one end of the tool stem and a shank provided at an opposite end of the stem and having a plurality of entrain grooves extending up to a free end surface of the shank, with an entire recessed surface of an entrain groove being larger than an entire outer surface of a groove-forming rest web, and with a mean rest cross-sectional area, which is measured within an axial section of the drilling tool having a length at least equal to a product of a natural logarithm base and a stem diameter, deviating from a mean rest cross sectional area along the entire tool length maximum by 20%.

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