EP 0933497 B1 20030820 - Drill tool
Title (en)
Drill tool
Title (de)
Bohrwerkzeug
Title (fr)
Outil de forage
Publication
Application
Priority
DE 29801700 U 19980202
Abstract (en)
[origin: EP0933497A2] This ground borer (10) has a shaft coaxial with the rotation axis (14), carrying drilling spiral(s) (13). At the pushing end (A), the cutter unit (16), extends radially from the axis. A novel feature is displacement of the radial sections of the cutter away from the axis. This gives rise to an initially-uncut central region (17). The cutters project forward (A), ahead of this central region. The shaft includes a surface (18) angled with respect to the axis. This pushes away the free-standing central core formed during drilling, urging it into the conveying region (20) of the drilling spiral(s).
IPC 1-7
IPC 8 full level
E21B 10/04 (2006.01); E21B 10/44 (2006.01)
CPC (source: EP)
E21B 10/04 (2013.01); E21B 10/44 (2013.01)
Designated contracting state (EPC)
AT DE ES FR GB IT
DOCDB simple family (publication)
EP 0933497 A2 19990804; EP 0933497 A3 20000712; EP 0933497 B1 20030820; AT E247765 T1 20030915; DE 29801700 U1 19980326; DE 59906619 D1 20030925; ES 2205605 T3 20040501
DOCDB simple family (application)
EP 99100208 A 19990107; AT 99100208 T 19990107; DE 29801700 U 19980202; DE 59906619 T 19990107; ES 99100208 T 19990107