EP 0864723 A1 19980916 - Boring bit and boring casing
Title (en)
Boring bit and boring casing
Title (de)
Bohrmeissel und Bohrfutterrohr
Title (fr)
Trépan de forage et cuvelage de forage
Publication
Application
Priority
JP 5596097 A 19970311
Abstract (en)
A boring bit 2 includes a cutter 24 which is in contact with the face of the ground to be bored to substantially conduct crushing of the ground and a shank 20 for holding the cutter 24. The cutter 24 comprises a disk-shaped cutter main body 24A, and journals 24B which are formed integrally with and on the opposite sides of the cutter main body 24A. Only a boring blade 24a projects beyond the distal end of the shank 20. The cutter 24 is rotatable born by the journals 24B. The wear of chip is less in comparison with the prior art chip. Extension of life time of the chip is achieved. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 10/48 (2006.01); E21B 10/02 (2006.01)
CPC (source: EP)
E21B 10/02 (2013.01)
Citation (search report)
- [X] US 3830321 A 19740820 - MC KENRY R, et al
- [A] US 1717271 A 19290611 - SIMMONS RICHARD P
- [A] DE 4301191 A1 19940721 - HAWERA PROBST KG HARTMETALL [DE]
- [A] PATENT ABSTRACTS OF JAPAN vol. 015, no. 437 (M - 1176) 7 November 1991 (1991-11-07)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 97304951 A 19970707; JP 5596097 A 19970311