EP 0003103 A3 19790808 - DOWN-THE-HOLE DRILLING
Title (en)
DOWN-THE-HOLE DRILLING
Publication
Application
Priority
ZA 7891 A 19780106
Abstract (en)
[origin: EP0003103A2] This invention concerns down-the-hole drilling, where there is a persistent problem in providing an adequately controlled flow of flushing fluid to the face of the drill bit. In known down-the-hole drills turbulence and closed circuits of the flushing fluid tend to erode the bit and reduce its lifespan. The invention seeks to lessen these drawbacks by providing for the flow of flushing fluid to be divided into a component directed along a first cavity (22, 24) which terminates at the face (18) of the bit and another component directed along a second cavity (28, 30) which terminates above the face and is deflected up the drill hole. Weakening of the bit is avoided if there is at most one bore through the bit for flushing fluid.
IPC 1-7
IPC 8 full level
E21B 10/38 (2006.01)
CPC (source: EP)
E21B 10/38 (2013.01)
Citation (search report)
- [D] GB 1071418 A 19670607 - P & V MINING & ENGINEERING LTD
- US 3269471 A 19660830 - ALEXANDER ROBERT T
- US 321023 A 18850630
- CA 871004 A 19710518 - HARD METALS CANADA LTD
- US 3299974 A 19670124 - JOHN CLEMMOW RAYMOND
- US 2507221 A 19500509 - ORVILLE PHIPPS
- AU 450556 B2 19740711
- US 3155180 A 19641103 - MACSWEEN GEORGE A
- US 3866746 A 19750218 - CURINGTON ALFRED R
- US 3991834 A 19761116 - CURINGTON ALFRED R
- FR 2200434 A1 19740419 - BOEHLER & CO AG GEB [AT]
- US 1943880 A 19340116 - REA WALTER C
- [AD] US 3225841 A 19651228 - THOMPSON CHARLES T
- [AD] DE 1238864 B 19670420 - FRITZ ZIMMERMANN
Designated contracting state (EPC)
CH DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0003103 A2 19790725; EP 0003103 A3 19790808; EP 0003103 B1 19821222; EP 0003103 B2 19861210; AU 4314779 A 19790712; AU 522330 B2 19820527; FI 69183 B 19850830; FI 69183 C 19851210; FI 790023 A 19790707; NO 151016 B 19841015; NO 151016 C 19850123; NO 790011 L 19790709; ZA 7891 B 19790829
DOCDB simple family (application)
EP 79100010 A 19790102; AU 4314779 A 19790105; FI 790023 A 19790104; NO 790011 A 19790102; ZA 7891 A 19780106