EP 2614217 A4 20151007 - IMPROVED ROCK DRILL

Title (en)

IMPROVED ROCK DRILL

Title (de)

VERBESSERTER STEINBOHRER

Title (fr)

FLEURET DE MINE AMÉLIORÉ

Publication

EP 2614217 A4 20151007 (EN)

Application

EP 11822919 A 20110228

Priority

AU 2010904066 A 20100910
AU 2011000220 W 20110228

Abstract (en)

[origin: WO2012031311A1] A rock drill including a first control valve (80), a first fluid circuit (70) suppliable with fluid via the first control valve (80), an impact piston (66) driveable by fluid pressure in the first fluid circuit, a plurality of first fluid circuit feedback paths (72) from the impact piston (66) to the control valve (80), a damping body (50) for damping backpressure from a rock face, a damping fluid chamber (52), associated with the damping body (50), characterised in a second fluid circuit (56) in fluid communication with the damping fluid chamber (52) and a stroke length control mechanism (91) actuable by fluid pressure in the second fluid circuit (56), wherein flow of fluid in said first fluid circuit feedback paths (72) is controllable by the stroke length control mechanism (91), whereby the driveable stroke length of said impact piston 66 may be adjusted.

IPC 8 full level

B23B 45/04 (2006.01); B25D 9/18 (2006.01); B25D 9/26 (2006.01); E21B 1/38 (2006.01); E21B 6/08 (2006.01); E21B 44/06 (2006.01)

CPC (source: EP US)

B25D 9/18 (2013.01 - EP US); B25D 9/26 (2013.01 - EP US); E21B 6/08 (2013.01 - EP US); E21B 44/06 (2013.01 - US)

Citation (search report)

[X] EP 0080446 A2 19830601 - ATLAS COPCO AB [SE]
[X] DE 112004002298 T5 20060928 - KONAN CONSTRUCTION MACHINERY C [JP]
[X] JP 2003311651 A 20031105 - FURUKAWA CO LTD
See references of WO 2012031311A1

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 2012031311 A1 20120315; AU 2011301130 A1 20130307; CA 2810914 A1 20120315; CL 2013000658 A1 20130823; CN 103097654 A 20130508; EP 2614217 A1 20130717; EP 2614217 A4 20151007; JP 2013537266 A 20130930; US 2014144660 A1 20140529

DOCDB simple family (application)

AU 2011000220 W 20110228; AU 2011301130 A 20110228; CA 2810914 A 20110228; CL 2013000658 A 20130308; CN 201180043362 A 20110228; EP 11822919 A 20110228; JP 2013527422 A 20110228; US 201113819389 A 20110228