Sandvik Mining and Construction Tools Patente

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A tension indication device 1 for a rock bolt 2 wherein the tension indication device 1 comprises a support washer 5, a cover member 6 with a central hole for receiving a trailing portion of the rock bolt 2, and an indicator substance 7 provided in a first space 8. The first space 8 is provided in the cover member 6 or in a recess in the support washer 5 for facing the nut 4. Upon rotation of the nut 4, indicator substance 7 is forced out of the first space 8 such that the indicator substance 7 is visible at inspection of the rock bolt 3, thereby indicating the rock bolt 3 has been tensioned.

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A shank adapter to form part of a drilling assembly, the shank adapter comprising: a main body extending axially between a first end and a second end; a male spigot portion provided at the second end having an externally threaded section and a non-threaded shank positioned axially intermediate the main body and the threaded section; a radially projecting shoulder positioned axially between the main body and the male spigot portion; the shank having a transition section positioned adjacent to the shoulder at the second end, the transition section having an outside diameter that increases in a direction from the spigot portion to the shoulder; wherein the cross-sectional shape profile of the outer surface of the transition section in the plane of the longitudinal axis comprises a segment of an ellipse having semi-major axis (a); a semi-minor axis (b) and an exponential factor (n) according to the equation: xan+ybn=1 characterised in that the ratio of the semi-major to semi-minor axes (a:b) is within the range 2b<a<8b.

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A rock drill bit for percussive drilling comprising a central flushing channel wherein the central flushing channel has an endmost surface; wherein the endmost surface of the flushing channel has an angle α measured between a first surface and a second surface on a longitudinal cross section of the bit; there is at least one identification marker positioned on the end most surface of the central flushing channel.

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A down the hole drilling assembly comprising: an elongate casing (15); a fluid powered piston (19) arranged moveably inside the casing (15) having a piston nose (24); a driver sub (34) provided with a set of axially extending driver sub splines (30) on its internal surface; a drill bit (14) comprising an elongate shank (29) provided with a set of axially extending shank splines (31) for engagement with the driver sub splines (29) to form a spline area (32); a guide sleeve (23) for forming a first seal (25) with the piston nose (24); wherein, the guide sleeve (23) forms a second seal with the outer surface of the shank (29) and there is at least one air passageway (55) extending through the guide sleeve (23) and / or the casing (15) for fluidly connecting the bottom chamber (22) to the spline area (32) to provide lubrication thereto.

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A drill string rod (1) to form part of an assembly (10) of connected such drill string rods (1, 1b), the drill string rod (1) comprising: an elongate central rod portion (2) extending axially between a male end (3) and a female end (4), wherein the central rod portion (2) is hollow-cylindrical defined by an inner first diameter (d<rod>) and an outer second diameter (D<rod>), wherein the male end (3) comprises a spigot (5),wherein the spigot (5) comprises a base (6) projecting axially from a shoulder (7) that axially separates the spigot (5) and the central rod portion (2), wherein the female end (4) comprises a sleeve portion (8) configured to fit to the spigot (5), wherein the base (6) is provided with an outer thread and wherein the sleeve portion (8) is provided with an inner thread, wherein the inner thread corresponds to the outer thread such that the inner thread of the sleeve portion (8) is attachable to the outer thread of the base (6) of the spigot (5) of a further drill string rod (1b) of the assembly (10), wherein, in a radial plane (P) to the longitudinal axis (9) of the drill string rod (1), the base (6) of the spigot (5) is defined by an outer third diameter (D<spigot>) and an inner fourth diameter (d<spigot>) and the sleeve portion (8) is defined by an outer fifth diameter (D<sleeve>) and an inner sixth diameter (d<sleeve>), wherein the second diameter (D<rod>) is between 30 and 60 mm, and wherein the six diameters mentioned are selected within specific constraints.

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A drill string rod comprising:an elongate hollow main length section (101);a male spigot portion (108) provided at the second end (106) having an externally threaded section (107) and a non-threaded shank (109) positioned axially intermediate the main length section (101) and the threaded section (107);the shank (109) having a transition section (206) positioned adjacent the main length section (101) or a radially projecting shoulder (110) at the second end (106), the transition section (206);wherein the cross-sectional shape profile of the outer surface of the transition section (206) in the plane of the longitudinal axis (204) comprises a segment of an ellipse having semi-major axis (a); a semi-minor axis (b) wherein the ratio of the semi-major to semi-minor axes (a:b) is within the range 2b<a<8b.

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A tension indication device (1) for a rock bolt (2), wherein the tension indication device (1) comprises a deformable body (6) to be compressed at tensioning of a nut attached to a trailing portion of a central rod of the bolt (2).