EP 2751368 B1 20171227 - PNEUMATIC DOWN-THE-HOLE DRILL
Title (en)
PNEUMATIC DOWN-THE-HOLE DRILL
Title (de)
PNEUMATISCHER IMLOCHBOHRER
Title (fr)
OUTIL DE FORAGE PNEUMATIQUE POUR FOND DE TROU
Publication
Application
Priority
- FI 20115980 A 20111006
- FI 2012050954 W 20121004
Abstract (en)
[origin: WO2013050657A1] A pneumatic down-the-hole drill having a frame (21 ), a pneumatic percussion piston (24) that moves in a reciprocating manner as pressurized air is fed into the DTH-drill and strikes a tool in the front end of the frame (21), mounted movably in the longitudinal direction of the frame (21 ), a feed channel for feeding compressed air to the DTH-drill, and shoulders in the frame (21 ) and in the percussion piston (24) for controlling compressed air to provide an impact movement. In the rear end of the frame (21 ) the DTH-drill comprises a combustion chamber (26) and an acceleration piston (25) which is arranged to push the percussion piston (24) during the impact movement for a portion of the percussion piston (24) travel, means for feeding combustion air and fuel into the combustion chamber (26), whereby the percussion piston (24) is arranged to push the acceleration piston (25) after the impact into the combustion chamber (26) and to compress the air in the combustion chamber (26) prior to feeding the fuel into the combustion chamber (26).
IPC 8 full level
E21B 4/06 (2006.01)
CPC (source: EP FI US)
E21B 4/06 (2013.01 - FI); E21B 4/14 (2013.01 - FI US); E21B 4/20 (2013.01 - EP 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 2013050657 A1 20130411; AU 2012320368 A1 20140522; AU 2012320368 B2 20160204; CA 2850907 A1 20130411; CA 2850907 C 20160412; CL 2014000837 A1 20140912; CN 103842606 A 20140604; CN 103842606 B 20160224; EP 2751368 A1 20140709; EP 2751368 A4 20160629; EP 2751368 B1 20171227; FI 123555 B 20130715; FI 20115980 A0 20111006; FI 20115980 A 20130407; JP 2014531543 A 20141127; JP 5854536 B2 20160209; KR 101513843 B1 20150420; KR 20140067167 A 20140603; US 2014224544 A1 20140814; ZA 201402459 B 20150325
DOCDB simple family (application)
FI 2012050954 W 20121004; AU 2012320368 A 20121004; CA 2850907 A 20121004; CL 2014000837 A 20140404; CN 201280049234 A 20121004; EP 12838275 A 20121004; FI 20115980 A 20111006; JP 2014533955 A 20121004; KR 20147011982 A 20121004; US 201214350060 A 20121004; ZA 201402459 A 20140402