US2023272678A1PendingUtilityA1

Thread clearance

Assignee: SANDVIK MINING AND CONSTRUCTION TOOLS ABPriority: Jun 30, 2020Filed: Jun 29, 2021Published: Aug 31, 2023

Est. expiryJun 30, 2040(~14 yrs left)· nominal 20-yr term from priority

Inventors:John Hammargren

E21B 17/0426E21B 17/02E21B 17/042

PatentIndex Score

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References

Claims

Abstract

A female portion is arranged to form part of a thread joint for a percussive drilling tool including a mounting sleeve having an axial end, wherein the mounting sleeve surrounds an internal cavity having an axial inner wall at the opposing end of the mounting sleeve compared to the axial end. The mounting sleeve has at least one substantially cylindrical internally threaded section having a length L1, a thread entrance positioned towards the axial end and a thread exit positioned towards the axial inner wall. A thread clearance section is positioned between the axial inner wall and the thread exit and has a length L2 and a diameter D1. A guiding section is positioned between the thread entrance and the axial end of the sleeve and has a length, L3, wherein 0 mm<L3-L2<12 mm.

Claims

exact text as granted — not AI-modified

1 . A female portion arranged to form part of a thread joint for a percussive drilling tool, the female portion comprising:
 a mounting sleeve having an axial end, wherein the mounting sleeve surrounds an internal cavity having an axial inner wall at the opposing end of the mounting sleeve compared to the axial end, wherein the mounting sleeve has at least one substantially cylindrical internally threaded section having a length L 1 , a thread entrance positioned towards the axial end and a thread exit positioned towards the axial inner wall;   a thread clearance section positioned between the axial inner wall and the thread exit having a length L 2  and a diameter D 1 ; and   a guiding section positioned between the thread entrance and the axial end of the sleeve having a length, L 3 , wherein 0 mm&lt;L 3 −L 2 &lt;12 mm.   
     
     
         2 . The female portion according to  claim 1 , wherein L 1  is between 25-56 mm. 
     
     
         3 . The female portion according to  claim 1 , wherein L 2 /L 1 &gt;0.01×D 1 . 
     
     
         4 . The female portion according to  claim 1 , wherein L 2 /L 1 &gt;26%. 
     
     
         5 . The female portion according to  claim 1 , wherein L 2 /L 1 &lt;65%. 
     
     
         6 . The female portion according to  claim 1 , wherein L 2 /D 1 &gt;30%. 
     
     
         7 . The female portion according to  claim 1 , wherein L 2 /D 1 &lt;65%. 
     
     
         8 . The female portion according to  claim 1 , wherein the female portion is part of a drill bit. 
     
     
         9 . The female portion according to  claim 1 , wherein the female portion is a female end of a drill string rod. 
     
     
         10 . A drill string rod comprising a female portion according to  claim 1 . 
     
     
         11 . A drill bit comprising a female portion according to  claim 1 .

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