EP 0233038 A3 19881123 - DOWN-THE-HOLE-DRILL
Title (en)
DOWN-THE-HOLE-DRILL
Publication
Application
Priority
ZA 86768 A 19860203
Abstract (en)
[origin: EP0233038A2] A down-the-hole drill is hydraulically powered with air flushing. The rotation motor (16) is on the drill string (10) and rotates a percussion hammer (20) to which the drill bit is chucked. Hydraulic fluid flows in umbilicals (11) clipped into grooves on the sides of the drill rods. The shuttle valve (26) for the hammer is in line with the piston (25).
IPC 1-7
E21B 4/16; E21B 21/12; E21B 21/14; E21B 17/18; E21B 17/10; E21B 4/14; E21B 21/08; E21B 44/00
IPC 8 full level
E21B 4/14 (2006.01); E21B 4/16 (2006.01); E21B 17/10 (2006.01); E21B 17/18 (2006.01); E21B 21/08 (2006.01); E21B 21/12 (2006.01); E21B 21/14 (2006.01); E21B 44/00 (2006.01)
CPC (source: EP)
E21B 4/14 (2013.01); E21B 4/16 (2013.01); E21B 17/1035 (2013.01); E21B 17/18 (2013.01); E21B 21/12 (2013.01); E21B 21/14 (2013.01); E21B 44/005 (2013.01)
Citation (search report)
- [X] DE 3416513 A1 19851107 - FRUEHLING OTTO
- [X] DE 3011263 A1 19801009 - HANSSON GOETE INGEMAR
- [X] DE 3416514 A1 19851107 - FRUEHLING OTTO
- [X] US 3978931 A 19760907 - SUDNISHNIKOV BORIS VASILIEVICH, et al
- [A] GB 2142364 A 19850116 - CHEVRON RES
- [A] DE 2733199 A1 19790201 - ROTTER ADOLF
- [A] DE 2430519 A1 19750123 - JOY MFG CANADA
- [A] DE 3143943 A1 19830511 - STROBEL CHRISTIAN
Designated contracting state (EPC)
AT CH DE FR GB IT LI SE
DOCDB simple family (publication)
EP 0233038 A2 19870819; EP 0233038 A3 19881123; AU 581800 B2 19890302; AU 6807387 A 19870806; FI 870444 A0 19870202; FI 870444 A 19870804; NO 870405 D0 19870202; NO 870405 L 19870804
DOCDB simple family (application)
EP 87300928 A 19870203; AU 6807387 A 19870128; FI 870444 A 19870202; NO 870405 A 19870202