ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYALTRBGCZEEHUPLSKBAHRIS..MTNORSMESMMAKHTNMDGE........J0009013-ENDS014800216EUROPEAN PATENT APPLICATIONA320261007EP26185460.820240618enenen2026100720264120260902202636E21B 4/14 20060101AFI20260902BHEP E21B 10/36 20060101ALI20260902BHEP E21B 17/07 20060101ALI20260902BHEP E21B 4/14 20130101 FI20241106BHEP E21B 10/36 20130101 LI20241106BHEP E21B 17/076 20130101 LI20241106BHEP deKEILAUSRICHTUNG FÜR DTH-HAMMERANORDNUNGenSPLINE ALIGNMENT FOR DTH HAMMER ASSEMBLYfrALIGNEMENT DE CANNELURE POUR ENSEMBLE MARTEAU DTH824182804.5466770320240618Sandvik Mining and Construction Oy100784210P16165EPD1Pihtisulunkatu 933330 TampereFIBRUANDET, Olivier33330 TampereFIKOSKINEN, Jouni33330 TampereFISandvik101698233Sandvik Intellectual Property AB811 81 SandvikenSEALATBEBGCHCYCZDEDKEEESFIFRGBGRHRHUIEISITLILTLULVMCMEMKMTNLNOPLPTRORSSESISKSMTRBAGEKHMAMDTN20261007202641

A hammer drill assembly for coupling to a drill string having a drill bit positioned at the forward end having a drill head and a bit shaft; wherein a plurality of axially extending bit splines project radially outwards from a radially outward facing surface of the bit shaft; wherein each of the bit splines comprises a bit spline tip at its axially rearward end having a rearward axially outer edge and a central bit spline longitudinal axis; and a driver sub provided axially rearward of the drill bit comprising a plurality of axially extending driver sub splines projecting radially inwards from an inward facing surface of the driver sub; characterised in that: the rearward axially outer edge on at least of one of bit spline tips is non-perpendicular to the bit spline longitudinal axis along at least 25% of the width of the bit spline tip.

P16165EPD1EP26185460.8Sandvik Mining and Construction OyMN20260903E21BWO2011023829A1MINROC TECHN PROMOTIONS LTD [IE]; PURCELL JOSEPH [IE]20110303X1-3,13A4-12* figures 6, 8 *WO2020016137A1MINCON INT LTD [IE]20200123X1-3,13A4-12* figure 5 *US2012012399A1HOERMAN MAGNUS [SE] ET AL20120119X1-3,13A4-12* figure 2 *KR101960692B1CHANG SIN INT CO LTD [KR]20190320A1-13* figures 17, 19 *Ott, StéphaneMunich20260821WO2011023829A120110303AU2010288420A120120315DE202010017983U120130612EP2473698A120120711US2012186883A120120726WO2011023829A120110303WO2020016137A120200123IES87041B220190821WO2020016137A120200123US2012012399A120120119AU2009337174A120110804CA2750853A120100722CL2011001706A120120203CN102282334A20111214EP2387650A120111123JP2012515281A20120705KR20110122119A20111109PT2387650T20180426SE0900035A120100715US2012012399A120120119WO2010082889A120100722ZA201105856B20120425KR101960692B120190320NONE