EP 0575922 A3 19940427 -
Publication
Application
Priority
DE 4220976 A 19920626
Abstract (en)
[origin: EP0575922A2] A displacement drill (10) has a displacement head (22) with a central, cylindrical displacement section (24) and frusto-conical displacement sections (26, 28) adjoining thereto. A lower drill section (12) bears a helical rib (16) which extends at a uniform height over the lower displacement section (26). The upper displacement section (28) is designed with conical-spiral displacement walls (32). <IMAGE>
IPC 1-7
IPC 8 full level
E21B 7/26 (2006.01); E21B 10/44 (2006.01)
CPC (source: EP US)
E02D 5/36 (2013.01 - EP US); E21B 7/26 (2013.01 - EP US); E21B 10/44 (2013.01 - EP US)
Citation (search report)
- [A] EP 0228138 A2 19870708 - COELUS GASPAR JOZEF [BE]
- [A] DE 9002781 U1 19910704
- [A] DE 576831 C 19330518 - WILHELM STRAUSS
- [A] US 4458765 A 19840710 - FEKLIN VALENTIN I [SU], et al
- [A] DE 1193081 B 19650520 - FRANK ARNOLD NIX DIPL ING
- [PX] DE 4107834 A1 19920917 - DELMAG MASCHINENFABRIK [DE]
Designated contracting state (EPC)
BE FR GB IT NL
DOCDB simple family (publication)
DE 4220976 C1 19930715; EP 0575922 A2 19931229; EP 0575922 A3 19940427; EP 0575922 B1 19970319; US 5353883 A 19941011
DOCDB simple family (application)
DE 4220976 A 19920626; EP 93109825 A 19930619; US 8333493 A 19930628