Drill bit

Details Drill bit Drill bit

E - Fixed Constructions

21

B

255/68

E21B 10/48 (2006.01) E21B 10/04 (2006.01) E21B 10/44 (2006.01) E21B 10/54 (2006.01) E21B 10/56 (2006.01) E21B 10/60 (2006.01)

Patent

CA 1161428

ABSTRACT A drill bit (10) comprises a cast body (12) with full length wide overlapping integral spiral stabilizer lands (14) between intervening spiral grooves (16), integral short, strong, stubby spiral fingers (18) reinforced by additional web portions (12a) angularly spaced about a short core receiving bore (b) and the longitudinal axis of the body (21). An inclined core ejection passage (P) extends radially outwardly from a spherical inlet end thereof connected to the core receiving bore (b) and at which an inclined hard core cutter breaker inserted within a pocket is situated. The leading sides of the fingers have support surfaces (18a) and shoulders (18b) for supporting engagement with composite abrasive compact cutters comprised of a carbide backing (30a) bonded to the support surfaces (18a) and layers of bonded polycrystalline abrasive particles at opposite cutting sides (30b) inclined at a negative rake angle. The body is also provided with flushing fluid passages (24) and a central bore at its drive end adapted with means (22) to connect drive means, with a flushing fluid passage therein to drive the drill bit (10).

384559

Affiliated with

Also associated with

Rating

Drill bit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drill bit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill bit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-672321