Drilling component

Abstract

A drilling component includes a first end portion configured to be arranged to face the a first section of a drill string. The first end portion includes a first interconnecting portion configured to engage a corresponding interconnecting portion of the first section of the drill string. The drilling component further includes a hollow interior configured to extend along a length direction of the drill string and to form a part of a passage through the drill string. The drilling component has a wall defining the hollow interior, wherein an area of a first cross-section of the wall is smaller than an area of a second cross-section of the wall and wherein the first cross-section is arranged between the second cross-section and the first end portion.

1 . A drilling component configured to interconnect a first section and a second section of a drill string, the drilling component comprising:
 a first end portion configured to be arranged to face the first section, wherein the first end portion includes a first interconnecting portion configured to engage a corresponding interconnecting portion of the first section of the drill string;   a hollow interior configured to extend along a length direction of the drill string and to form a part of a passage through the drill string; and   a wall defining the hollow interior, wherein a part of the passage is formed by a first region having a first cross-section and a second region having a second cross-section, wherein the first region is arranged at the first end portion and extends at least partially along the first interconnecting portion, wherein the second region extends between the first region and a second end portion of the drilling component, wherein the wall in the first region has a cylindrical profile, wherein the wall in the first region is parallel to the wall in the second region, wherein the area of a first cross-section of the wall is smaller than the area of a second cross-section of the wall, and wherein the first cross-section is arranged between the second cross-section and the first end portion.   
     
     
         2 . The drilling component according to  claim 1 , wherein the first interconnecting portion includes an externally threaded section configured to engage the corresponding interconnecting portion of the first section of the drill string. 
     
     
         3 . The drilling component according to  claim 1 , further comprising a second interconnecting portion configured to engage a corresponding interconnecting portion of a second section of the drill string. 
     
     
         4 . The drilling component according to  claim 3 , wherein the second interconnecting portion includes an internally threaded section configured to engage the corresponding interconnecting portion of the second section of the drill string. 
     
     
         5 . The drilling component according to  claim 1 , further comprising a second interconnecting portion configured to be connected to a rock-drill piston interface. 
     
     
         6 . The drilling component according to  claim 1 , further comprising a shank positioned adjacent to the first interconnecting portion, wherein the first interconnecting portion is arranged between the shank and the first end portion. 
     
     
         7 . The drilling component according to  claim 1 , further comprising a radially outward protruding shoulder configured to transfer a force to the first section of the drill string along the length direction of said drill string. 
     
     
         8 . The drilling component according to  claim 7 , wherein the first end portion includes an end surface configured to transfer a force to the first section of the drill string along the length direction of the drill string. 
     
     
         9 . The drilling component according to  claim 1 , wherein a cross-sectional area of the first region is larger than a cross-sectional area of the second region. 
     
     
         10 . The drilling component according to  claim 1 , wherein the second region of the part of the passage comprises a cylindrical bore. 
     
     
         11 . The drilling component according to  claim 1 , wherein the first region of the part of the passage includes a cross-sectional shape conforming to a circle, an oval or a polygon. 
     
     
         12 . A percussion drill string comprising at least one drilling component as claimed in  claim 1 .