EP 3523496 B1 20201202 - DRILLING CROWN
Title (en)
DRILLING CROWN
Title (de)
BOHRKRONE
Title (fr)
COURONNE DE FORAGE
Publication
Application
Priority
EP 2016074231 W 20161010
Abstract (en)
[origin: WO2018068818A1] The invention relates to a drilling crown (11) for the drilling, more particularly the rotary-percussive drilling, of a hole, more particularly of a tap hole of a melting furnace. The drilling crown (11) has a drilling head (10) comprising at least one hard material insert (16) and a base part (12) for connecting to a drive element, wherein the hard material insert (16) is inserted into a receptacle formed in an axial end face (13) of the drill head (10) such that the hard material insert (16) protrudes, at least by a head cutting edge (18), beyond the axial end face (13), the receptacle having a flank portion and a mating flank portion opposed to the flank portion, between which the hard material insert (16) is arranged. The flank portion, opposed to a cutaway formed in the hard material insert (16), is provided with a material connecting portion (35) formed at least in part from a welding material, integrally connected to the drilling head (10) via the welding material and projecting into the cutaway in order to form an interlocking connection with the hard material insert (16).
IPC 8 full level
E21B 10/38 (2006.01); C21B 7/12 (2006.01); E21B 10/54 (2006.01); E21B 10/56 (2006.01)
CPC (source: EP KR RU US)
C21B 7/12 (2013.01 - EP KR RU US); E21B 10/36 (2013.01 - RU US); E21B 10/38 (2013.01 - EP KR US); E21B 10/54 (2013.01 - EP KR RU US); E21B 10/56 (2013.01 - EP KR US)
Designated contracting state (EPC)
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
DOCDB simple family (publication)
WO 2018068818 A1 20180419; BR 112019007179 A2 20190625; BR 112019007179 B1 20220712; CN 110036175 A 20190719; CN 110036175 B 20200804; EP 3523496 A1 20190814; EP 3523496 B1 20201202; JP 2019534406 A 20191128; JP 6785977 B2 20201118; KR 102291684 B1 20210820; KR 20190062473 A 20190605; RU 2712994 C1 20200203; US 11306541 B2 20220419; US 2019277094 A1 20190912
DOCDB simple family (application)
EP 2016074231 W 20161010; BR 112019007179 A 20161010; CN 201680089969 A 20161010; EP 16787756 A 20161010; JP 2019540488 A 20161010; KR 20197012007 A 20161010; RU 2019112038 A 20161010; US 201616338151 A 20161010