EP 0345096 A1 19891206 - Drill bit.
Title (en)
Drill bit.
Title (de)
Bohrmeissel.
Title (fr)
Trépan de forage.
Publication
Application
Priority
ZA 883939 A 19880603
Abstract (en)
This invention relates to a drill bit which comprises a shank (2) which has a thread (18) down the centre and a head (3), the shape of which is defined by a flat central front face (4) and a chamferred peripheral surface (5). The front face has at least one eccentrically located face button approximately 8mm in diameter, and the peripheral surface has at least six gauge buttons, approximately 10mm in diameter, spaced typically at radial angles of 54 DEG and 66 DEG . The drill bit also has typically two flushing holes, the first extending from a flushing chamber (16) to an eccentrically located opening (15) at the front face and the second extending from the flushing chamber and opening at the peripheral surface. Also associated with the peripheral surface are flushing flutes which extend along the axis of the head.
IPC 1-7
IPC 8 full level
E21B 10/38 (2006.01); E21B 10/56 (2006.01)
CPC (source: EP)
E21B 10/38 (2013.01); E21B 10/56 (2013.01)
Citation (search report)
- [X] FR 983901 A 19510629 - JOY MFG CO
- [X] EP 0140849 A2 19850508 - SANTRADE LTD [CH]
- [A] US 4730682 A 19880315 - DITZIG JOSEPH R [US]
- [A] US 4296825 A 19811027 - LARSSON LARS E
- [A] US 4304312 A 19811208 - LARSSON LARS E
Designated contracting state (EPC)
DE FR SE
DOCDB simple family (publication)
EP 0345096 A1 19891206; FI 892721 A0 19890602; FI 892721 A 19891204; NO 892223 D0 19890601; NO 892223 L 19891204
DOCDB simple family (application)
EP 89305634 A 19890605; FI 892721 A 19890602; NO 892223 A 19890601