Sandvik Ab

Hangkan Engstrom

Jan-Gunnar Hedlund

Goran Palmberg

A rock drill for percussive drilling includes a shank, a collar connected to a front end of the shank, and a rod portion which at one end connects to the collar while the other end carries a rock cutting means. A central flush channel extends from the front free end of the shank in a direction towards the front end. The central flush channel has a substantially constant diameter (d) along essentially its entire length; a ratio of the diameter (d) to a smallest outer cross sectional width (D) of the rod portion being in the range of 0.35 to 0.43.

Growing community of inventors

Gavle, Sweden

Hangkan Engstrom