(19)
(11) EP 4 512 990 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.05.2025 Bulletin 2025/19

(43) Date of publication A2:
26.02.2025 Bulletin 2025/09

(21) Application number: 24219918.0

(22) Date of filing: 29.06.2021
(51) International Patent Classification (IPC): 
E21B 17/02(2006.01)
 E21B 17/042(2006.01)
(52) Cooperative Patent Classification (CPC):
E21B 17/0426; E21B 17/02; E21B 17/042
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 30.06.2020 EP 20183128

(62) Application number of the earlier application in accordance with Art. 76 EPC:
21737073.3 / 4172455

(71) Applicant: Sandvik Mining and Construction Tools AB
811 34 Sandviken (SE)

(72) Inventor:
  • HAMMARGREN, John
    81181 Sandviken (SE)

(74) Representative: Sandvik 
Sandvik Intellectual Property AB
811 81 Sandviken
811 81 Sandviken (SE)

   


(54) THREAD CLEARANCE


(57) A female portion to form part of a thread joint for a percussive drilling tool 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 L1, a thread entrance towards the axial end and a thread exit towards the axial inner wall; a thread clearance section positioned between the axial inner wall and the thread exit having a length L2 and a diameter D1;
a guiding section positioned between the thread entrance and the axial end of the sleeve having a length, L3; characterized in that: 0 mm < L3-L2 < 12 mm.







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Search report