A top hammer rock-drilling tool, a drill rod and coupling...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/042 (2006.01)

Patent

CA 2652278

In a first aspect, the invention relates to a rock-drilling tool that comprises a drill rod (1) having a male thread (5) as well as a coupling sleeve having a female thread for the co-operation with the male thread of the drill rod. The male thread (5) of the drill rod may consist of a martensitic stainless steel. Axially inside the male thread (5), a waist (32) is formed in which the drill rod (1) has the smallest diameter thereof. Furthermore, an external, cylindrical guide surface (31) is positioned between the male thread (5) and the waist (32) and has the purpose of co-operating with an internal guide surface positioned between the female thread and a free end of the coupling sleeve. Furthermore, the invention relates to a drill rod as such as well as a coupling sleeve as such.

Dans un premier aspect l'invention comprend une tige de forage (1) avec partie filetée mâle (5) ainsi qu'un manchon d'accouplement avec partie filetée femelle qui se connecte à la partie mâle de la tige de forage. La partie filetée mâle (5) de la tige de forage peut être en acier martensitique inoxydable. Axialement à l'intérieur de la partie mâle (5) une taille (32) est formée dans laquelle la tige de forage (1) a un plus petit diamètre que celle-là. En outre une surface guide cylindrique externe (31) est positionnée entre la partie filetée mâle (5) et la taille (32) afin de travailler de concert avec une surface guide interne située elle entre la partie filetée femelle et une extrémité libre du manchon d'accouplement. La présente invention concerne enfin une tige de forage ainsi qu'un manchon d'accouplement.

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