Sandvik Intellectual Property Ab

Susanne Lejon

Tomas Sh Jansson

Jens Sundin

Bo Carlström

Magnus Persson

A rock drilling shank adaptor includes an elongate body having an internal flushing bore and an entry hole through the sidewall of the adaptor in fluid communication with the internal bore. The adaptor wall at the region of the entry hole is reinforced such that an internal diameter of the flushing bore at the reinforced region is less than an internal diameter of the bore at a position axially beyond the reinforced region.

Shank adaptor with reinforced flushing slot

The invention relates to a drill bit () for percussive rock drilling, which comprises: &#x2014;a drill head (); &#x2014;a skirt (), which has a first end and an opposite second end, the skirt being connected to the drill head at said first end; &#x2014;a recess () extending axially through the skirt from the second end of the skirt towards the first end thereof, the recess being provided with an internal, cylindrical female thread (); and &#x2014;an impact surface () at the bottom of the recess. Every cross-section of the recess () between the impact surface and the part of the recess where the female thread has its full thread profile has a cross-sectional area which is smaller than the cross-sectional area of a cross-section of the recess at the part of the recess where the female thread has its full thread profile.

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Kungsgarden, Sweden

Susanne Lejon