EP 0979920 A3 20031210 - Drill apparatus with twin impact system
Title (en)
Drill apparatus with twin impact system
Title (de)
Bohrvorrichtung mit Doppelschlagsystem
Title (fr)
Appareil de forage avec système d'impact double
Publication
Application
Priority
DE 19836389 A 19980812
Abstract (en)
[origin: EP0979920A2] The outer tube (2) can be activated by a striker part (8) displaceable longitudinally and arranged over the inner tube (3). The insert end (5) extending on both sides over the rotary mechanism has on the rotary striking mechanism side a compensation ring (10) which has a hardness below that of the tube material and the striker part. The compensation ring has a curved surface on both sides, corresponding to the abutting end piece (11) of the insert end. In the housing (9) on the curved surface of the compensation ring lubricating holes (12) are provided.
IPC 1-7
IPC 8 full level
E21B 6/00 (2006.01); E21B 6/04 (2006.01); E21B 7/00 (2006.01); E21B 7/20 (2006.01); E21B 17/02 (2006.01); E21B 17/03 (2006.01)
CPC (source: EP US)
E21B 6/04 (2013.01 - EP US); E21B 7/002 (2013.01 - EP US); E21B 7/20 (2013.01 - EP US); E21B 17/03 (2013.01 - EP US)
Citation (search report)
- [AD] DE 3503893 C1 19851024 - KLEMM BOHRTECH
- [A] FR 2002816 A1 19691031 - BOEHLER & CO AG GEB
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0979920 A2 20000216; EP 0979920 A3 20031210; EP 0979920 B1 20050302; AT E290155 T1 20050315; CA 2268400 A1 20000212; DE 19836389 C1 20000413; DE 59812616 D1 20050407; US 6202763 B1 20010320
DOCDB simple family (application)
EP 98121952 A 19981119; AT 98121952 T 19981119; CA 2268400 A 19990407; DE 19836389 A 19980812; DE 59812616 T 19981119; US 29617199 A 19990422