EP 0156762 B1 19880518 - TREPANING CUTTER
Title (en)
TREPANING CUTTER
Publication
Application
Priority
DE 3408092 A 19840305
Abstract (en)
[origin: EP0156762A1] 1. A hollow drill bit comprising a metallic hollow cylindrical supporting body (2) having an open end in the direction of drilling with positively secured equally shaped support segments (5, 11, 21, 31) spaced apart from each other around the circumference in which cutting teeth of diamond grain are embeded where the support segments protrude beyond the end face of the supporting body (2) in the direction of drilling, characterized in that the end section of the supporting segments (5, 11, 21, 31) at the drilling end tapers over at least a part of its length in the direction of drilling and the free end face forms a line (8, 13, 23, 33) running in the direction of the circumference over at least a part of the tapered end section of the support segments.
IPC 1-7
IPC 8 full level
B28D 1/04 (2006.01); B28D 1/14 (2006.01); E21B 10/48 (2006.01)
CPC (source: EP)
B28D 1/041 (2013.01); E21B 10/48 (2013.01)
Designated contracting state (EPC)
AT BE CH DE LI
DOCDB simple family (publication)
EP 0156762 A1 19851002; EP 0156762 B1 19880518; AT E34329 T1 19880615; DE 3408092 A1 19850919; DE 3562725 D1 19880623
DOCDB simple family (application)
EP 85810026 A 19850125; AT 85810026 T 19850125; DE 3408092 A 19840305; DE 3562725 T 19850125