EP 0439821 B1 19931013 - CUTTING CROWN FOR CASINGS WITH EASILY EXCHANGEABLE TEETH
Title (en)
CUTTING CROWN FOR CASINGS WITH EASILY EXCHANGEABLE TEETH
Publication
Application
Priority
DE 4002907 A 19900201
Abstract (en)
[origin: EP0439821A1] The invention relates to a cutting crown for drill rods for sinking cased boreholes, with a basic body which is designed as an essentially cylindrical ring, can be welded to a drill pipe in extension of the same or can be detachably connected to this drill pipe, if need be indirectly via a connecting ring, by means of threaded bolts or the like and is provided at its free front end with cutting teeth projecting beyond this front end and beyond its outer side and arranged in a distributed manner over the periphery at uniform distances apart, characterised in that the teeth (4) are indirectly connected to the basic body via sleeves (1) welded in and completely filling relieved portions of the basic body, the sleeve being provided with a recess (2) for the adapted accommodation and fastening of tooth roots (5) formed on the teeth. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 10/02 (2006.01); E21B 10/48 (2006.01); E21B 10/62 (2006.01)
CPC (source: EP)
E21B 10/485 (2013.01); E21B 10/62 (2013.01)
Citation (examination)
DE 537686 C 19311109 - HANIEL & LUEG GMBH
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0439821 A1 19910807; EP 0439821 B1 19931013; AT E95889 T1 19931015; DE 4002907 A1 19910808; DE 4002907 C2 19920102; DE 59003087 D1 19931118; DK 0439821 T3 19940307; ES 2047236 T3 19940216
DOCDB simple family (application)
EP 90125346 A 19901222; AT 90125346 T 19901222; DE 4002907 A 19900201; DE 59003087 T 19901222; DK 90125346 T 19901222; ES 90125346 T 19901222