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    THREAD PITCH
    1.
    发明申请
    THREAD PITCH 审中-公开

    公开(公告)号：WO2023088939A1

    公开(公告)日：2023-05-25

    申请号：PCT/EP2022/082078

    申请日：2022-11-16

    Applicant: SANDVIK MINING AND CONSTRUCTION TOOLS AB

    Inventor： HAMMARGREN, John

    IPC: E21B17/042

    Abstract: A female portion to form part of a thread joint for a percussive drilling tool comprising: a mounting sleeve; wherein the mounting sleeve has at least one substantially cylindrical internally threaded section having a length, L1, a thread entrance towards an axial end and a thread exit towards the axial inner wall; wherein the threaded section has a thread form including crests, roots, contact flanks, and non-contact flanks, and having a pitch length, L4, between two axially neighbouring crests and an inner diameter, D2, radially between the roots; 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: the pitch length, L4, is between 12.8 – 14.5 mm.

    ROLLER CUTTING TOOL WITH IMPROVED SEALING
    3.
    发明申请
    ROLLER CUTTING TOOL WITH IMPROVED SEALING 审中-公开

    公开(公告)号：WO2021165323A1

    公开(公告)日：2021-08-26

    申请号：PCT/EP2021/053893

    申请日：2021-02-17

    Applicant: SANDVIK MINING AND CONSTRUCTION TOOLS AB

    Inventor： LOIKKANEN, Joona ,  LINDBLOM, Anders

    IPC: E21B10/25

    Abstract: A roller cutter for a drill head for raise boring said roller cutter having a shaft with a longitudinal centre line; a hub rotatably mounted on the shaft; a seal retainer located between the axial ends of the hub and the shaft at least arranged at one end of the roller cutter; the seal retainer supporting a primary cutter seal providing sealing between the shaft and the hub in both axial and radial directions, a secondary cutter seal located between the seal retainer and the hub, and that the secondary cutter seal provides sealing in the axial direction.

    DRILL BIT WITH DIRECTED FLUSHING HOLES
    4.
    发明申请
    DRILL BIT WITH DIRECTED FLUSHING HOLES 审中-公开

    公开(公告)号：WO2021148597A1

    公开(公告)日：2021-07-29

    申请号：PCT/EP2021/051438

    申请日：2021-01-22

    Applicant: SANDVIK MINING AND CONSTRUCTION TOOLS AB

    Inventor： NORMAN, Andreas ,  LEANDERS, Benneth

    IPC: E21B10/36 ,  E21B10/38

    Abstract: The present disclosure relates to a rock drill bit for percussive drilling comprising a bit head (4), a shank (10) having a cavity (18) centred on an elongate bit central axis; at least one flushing port (24) having a first end proximal to the longitudinal internal surface of the cavity (18) and a second end proximal to the flushing hole and a flushing port central axis; the flushing port central axis at the first end of each flushing port is positioned at a first radial distance, D1, from the bit central axis and the flushing port central axis at the second end of each flushing port is positioned at a second radial distance, D2, from the bit central axis, wherein at least one of the flushing ports distances are different or greater as D2(D1 ≥ D2).

    ROCK BOLT ASSEMBLY COMPRISING A SENSOR ASSEMBLY
    6.
    发明申请
    ROCK BOLT ASSEMBLY COMPRISING A SENSOR ASSEMBLY 审中-公开

    公开(公告)号：WO2021123140A1

    公开(公告)日：2021-06-24

    申请号：PCT/EP2020/086991

    申请日：2020-12-18

    Applicant: SANDVIK MINING AND CONSTRUCTION TOOLS AB ,  SANDVIK MINING AND CONSTRUCTION AUSTRALIA PTY LTD

    Inventor： VALLATI, Osvaldo

    IPC: E21D21/00 ,  E21D21/0033

    Abstract: A sensor assembly for a rock bolt, wherein the rock bolt comprises a central rod, a split tube for being fitted around the central rod, a wedge anchor assembly fitted to the central rod, a rock plate with a hole, and a nut for attachment to an outer end of the central rod, wherein the sensor assembly comprises: a distance sensor, a bracket for attaching the distance sensor to an outer portion of the split tube, an elongate spacing member configured to be fitted around the split tube between the nut and the rock plate to keep the nut and the rock plate spaced apart, wherein the spacing member comprises an opening extending along at least a portion of the length of the spacing member, wherein the opening is sized large enough to allow movement of the bracket along a portion of the length of the spacing member with the distance sensor attached to the outer portion of the split tube by the bracket.

    VISUAL INDICATOR FOR CORRECT TORSION OF A ROCK BOLT
    7.
    发明申请
    VISUAL INDICATOR FOR CORRECT TORSION OF A ROCK BOLT 审中-公开

    公开(公告)号：WO2021089353A1

    公开(公告)日：2021-05-14

    申请号：PCT/EP2020/080013

    申请日：2020-10-26

    Applicant: SANDVIK MINING AND CONSTRUCTION TOOLS AB ,  SANDVIK MINING AND CONSTRUCTION AUSTRALIA PTY LTD

    Inventor： WEAVER, Steven ,  RATAJ, Mieczyslaw ,  VALLATI, Osvaldo

    IPC: E21D21/02 ,  F16B31/02

    Abstract: A rotation indication device (1) for a rock bolt (2) comprising a central rod (3) with a threaded trailing portion (4), wherein the rotation indication device (1) comprises a blind nut (5) comprising a threaded central recess for engaging the threaded trailing portion, and wherein the rotation indication device (1) comprises a visual indication means (7) provided at a bottom portion (8) of the central recess and configured such that upon movement of the threaded trailing portion (4) of the central rod (3) into the bottom portion (8) of the central recess, the central rod (3) forces at least a portion of the visual indication means (7) to move through a passage (9) in the blind nut (5) between the bottom portion of the central recess and the outside of the blind nut (5).

    DRILL BIT
    8.
    发明申请
    DRILL BIT 审中-公开

    公开(公告)号：WO2021004909A1

    公开(公告)日：2021-01-14

    申请号：PCT/EP2020/068753

    申请日：2020-07-03

    Applicant: SANDVIK MINING AND CONSTRUCTION TOOLS AB

    Inventor： HAMMARGREN, John

    IPC: E21B10/36

    Abstract: The present invention relates to a drill bit (100) for percussion drilling comprising: a drill bit body (101) intended to extend along an axis A and comprising a front surface (105), said front surface comprises a first circular area (110) arranged transverse and coaxially to axis A, a second area surface (111) surrounding said first area surface (110), said second area surface (111) is extending in an angle α in relation to a plane transverse to axis A, and a third area surface (112) surrounding said second area surface (111), said third area surface (112) is extending in an angle β in relation to a plane transverse to axis A such that the front surface (105) will have a substantially convex shape; and a number (n) of buttons (200) arranged in said second area surface (111) and third area surface (112), said buttons (200) have a button body (201) extending along an axis B and a length L along axis B, said button body (201) has a circular cross-sectional shape transverse to axis B, a rear end surface (203) and a forward end surface (204), wherein the angle α is within the range of 5 -15°, the angle β is within the range of 30 - 45° and the buttons 200 are arranged in circular recesses (120) extending substantially transverse from the second surface (111) and third area surface (112) into the drill bit body (101), said recesses (120) have a radius corresponding to the button body radius (Rb) and a depth corresponding to 20 the length L of the button body (201) such that the button bodies (201) are fitted within the drill bit body (101) with the forward end surface (204) exposed in the second area surface (111) and third area surface (112).

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