Abstract: Rock bit for drilling holes in the earth's crust which can be connected to driving means and being provided with supports or rock bit legs in which rotatable cutting elements or cutter cones are journalled, wherein a rock bit support comprises a removable part to which the bearing outer race ring is connected, the support part being a regularly shaped spatial body having edges which, in the assembled position, are situated in boundary planes of the support or rock bit leg.

Abstract: Rock bit assembly comprising a rock bit for drilling holes in the earth's crust mainly consisting of an integral bit body which can be connected to a drive shaft, a number of rotatable cutter cones which, by means of a rolling bearing arrangement, is rotatably connected to said bit body, each of said cutter cones comprising a central shaft or pin forming a part of said rolling bearing arrangement, wherein a cutter cone and bearing arrangement form a unit which is disengageably secured to said bit body by means of the outer race ring of said bearing arrangement.

Abstract: A process for compacting a granular radio-active material into a sealed solid body for use as a heat source, the process carried out in a hot-cell which is partially evacuated.