Down-the-hole rock drill

Details Down-the-hole rock drill Down-the-hole rock drill

E - Fixed Constructions

21

B

E21B 4/06 (2006.01) B25D 17/08 (2006.01) E21B 10/38 (2006.01) E21B 17/00 (2006.01) E21B 17/07 (2006.01)

Patent

CA 2125882

The present down-the-hole rock drill is characterized in a com- bination of features where the first feature is that the lower portion (18a; 18'a) of the shank (18; 18') of the drill bit (19)/guide device (19') is given a cross-sectional shape that is a multi-lobed figure that is continuously non-concave and the second feature is that the upper portion (18b; 18'b) of the shank (18; 18') of the drill bit (19)/guide device (19') is provided with a shoulder means (21; 21') on said sec- ond portion (18b; 18'b) of the shank (18; 18').

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