A rock-drilling tool, a drill rod and a coupling sleeve

Details A rock-drilling tool, a drill rod and a coupling sleeve A rock-drilling tool, a drill rod and a coupling sleeve

E - Fixed Constructions

21

B

E21B 17/042 (2006.01)

Patent

CA 2652279

In a first aspect, the invention relates to a rock-drilling tool that comprises a drill rod (1;1"') having a male thread (5;5'), and a coupling sleeve (7:7') having a female thread (15:15') for the co-operation with the male thread of the drill rod. The male thread (5;5') of the drill rod (1;1f) may consist of a martensitic, stainless steel. The coupling sleeve consists of hardened low-alloy steel. Axially inside the male thread (5;5'), a waist (32;32') is formed in which the drill rod (1;1') has the smallest diameter thereof. The male thread (5;5') has a wear volume that is larger than the wear volume of the female thread (15; 15'). Furthermore, the invention relates to a drill rod per se as well as a coupling sleeve per se.

Selon un premier aspect, la présente invention concerne un outil de forage de roches comportant une tige de forage (1; 1'') comprenant un filetage mâle (5; 5'), et un manchon de couplage (7; 7') comprenant un filetage femelle (15; 15') pour coopérer avec le filetage mâle de la tige de forage. Le filetage mâle (5; 5') de la tige de forage (1; 1f) peut être constitué d'un acier inoxydable martensitique. Le manchon de couplage est constitué d'un acier de faible alliage endurci. Axialement à l'intérieur du filetage mâle (5; 5'), un étranglement (32; 32') est formé dans lequel la tige de forage (1; 1') présente son plus petit diamètre. Le filetage mâle (5; 5') comprend un volume d'usure qui est plus grand que le volume d'usure du filetage femelle (15; 15'). L'invention concerne également une tige de forage en soi et un manchon de couplage en soi.

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