EP 0657617 B1 19990818 - Rock drill bit
Title (en)
Rock drill bit
Title (de)
Gesteinsbohrer
Title (fr)
Trépan de roche
Publication
Application
Priority
- DE 4342324 A 19931211
- DE 4407119 A 19940304
Abstract (en)
[origin: EP0657617A1] A rock drill bit for hammer drilling machines is proposed, having a spiral shank and a drill head connected to it, on the end face of which a main cutting tip (6) inclined in a roof shape and secondary cutting tips (12, 13) arranged transversely to it are arranged. The drill head contains two laterally opposite flats for forming grooves for the cuttings. In plan view, the drill head is of rectangular configuration in cross-section to the greatest possible extent, an acute angle ss1 being enclosed between the main cutting tip and the lagging secondary cutting tips. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 10/44 (2006.01); E21B 10/58 (2006.01)
CPC (source: EP US)
E21B 10/445 (2013.01 - EP US); E21B 10/58 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE DK FR GB IT LI
DOCDB simple family (publication)
EP 0657617 A1 19950614; EP 0657617 B1 19990818; CN 1056900 C 20000927; CN 1107201 A 19950823; DE 4407119 A1 19950614; DE 59408638 D1 19990923; DK 0657617 T3 20000320; US 5482124 A 19960109
DOCDB simple family (application)
EP 94116965 A 19941027; CN 94119874 A 19941207; DE 4407119 A 19940304; DE 59408638 T 19941027; DK 94116965 T 19941027; US 33664994 A 19941104