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US 2010/0059285 A1Published application
Top hammer rock-drilling tool, a drill rod coupling sleeve
OwnerBo Carlström, Johan Lindéninventors
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OwnerBo Carlström, Johan Lindéninventors
Estimating the term…
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.
A top hammer rock-drilling tool comprising a drill rod having a male thread, and a coupling sleeve having a female thread for the co-operation with the male thread of the drill rod, wherein the male thread of the drill rod may consist of a martensitic, stainless steel, and that a waist is formed axially inside the male thread, in which waist the drill rod has the smallest diameter thereof, an external, cylindrical guide surface being positioned between the male thread and the waist and having the purpose of co-operating with an internal guide surface positioned between the female thread and a free end of the coupling sleeve.
A top hammer drill rod for rock-drilling tools, comprising a male thread that is formed adjacent to a free end and in the form of a helix thread ridge having a crest and two flanks, which delimit a likewise helix groove having a bottom, wherein said male thread may consist of a martensitic, stainless steel, and that axially inside the male thread, a waist is formed in which the drill rod has the smallest diameter thereof, a cylindrical guide surface being formed between the waist and the male thread, the diameter of which guide surface is larger than the outer diameter of the thread ridge.
A coupling sleeve for top hammer rock-drilling tools, the coupling sleeve comprising two hollow spaces, which terminate in opposite directions and are separated by a partition wall, and in which female threads are formed, wherein a first female thread is spaced-apart from a free end of an internal, cylindrical guide surface, the first female thread being a thread ridge having a crest and two flanks that delimit a helix groove having a bottom, the width of the thread ridge being smaller than the width of the groove.
Dependencies are inferred from the claim text.