Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00)

Child Classifications

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• E21B 10/003
• E21B 10/006
• E21B 10/02 Core bits (characterised by wear resisting parts E21B10/48)
• E21B 10/08 Roller bits (E21B10/26 takes precedence; roller core bits E21B10/06; characterised by wear resisting parts E21B10/50)
• E21B 10/26 Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B10/40)
• E21B 10/36 Percussion drill bits ( characterised by wear resisting parts E21B10/46)
• E21B 10/42 Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits (characterised by wear resisting parts E21B10/46; by conduits or nozzles for drilling fluid E21B10/60; by detachable or adjustable parts E21B10/62)
• E21B 10/44 Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts (E21B10/42 takes precedence)
• E21B 10/46 characterised by wear resisting parts, e.g. diamond inserts
• E21B 10/60 characterised by conduits or nozzles for drilling fluids (for roller bits E21B10/18; for percussion drill bits E21B10/38)
• E21B 10/62 characterised by parts, e.g. cutting elements, which are detachable or adjustable (E21B10/64 takes precedence; for roller bits E21B10/20; for augers E21B10/44)
• E21B 10/64 characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe