Release assembly and method of forming drilling tool

摘要

Abstract The invention relates to a release assembly and a method of forming a drilling tool for rock or overburden drilling. The release assembly (18) is arranged axially between two drilling tool components (14a, 14b). The release assembly comprises a release mechanism allowing an initial axial length (Li) to shorten (Ls) when a joint (15) of the drilling tool components (14) provided with connecting threads (20, 21) is turned in an opening direction (Ro). Then the release assembly has a decreased second axial length (L2) and friction forces in the joint decrease. (Figure 3) 5884676_1 (GHMatters) P98148.AU BELAG Rc -21 14a 19 22a24-- 2 R -28 29 22b D1 -- 32 14b 24 2628 9 Ls Ro8 FIG. 4 24-- 30- 31