Earth penetrating rotary drill bit with helical ports

Details Earth penetrating rotary drill bit with helical ports Earth penetrating rotary drill bit with helical ports

E - Fixed Constructions

21

B

E21B 10/58 (2006.01)

Patent

CA 2530872

A drill bit (20) that has a drill bit body (30) with a side wall (36) and opposite ends (32, 34). A distal one (32) of the opposite ends of the drill bit body (30) receives a cutting insert (22). The drill bit body (30) contains at least two helical debris ports (46) in the side wall (36) thereof. The drill bit body (30) further contains a helical scallop (48) that corresponds to each one of the helical debris ports (46). Each one of the helical scallops (48) surrounds so as to define the periphery of its corresponding one of the helical debris ports (46).

L'invention porte sur un trépan (20) comportant un corps (30) présentant: une paroi latérale (36); des extrémités opposées (32, 34); un insert de coupe (22) monté à l'extrémité distale (32); deux orifices (46) hélicoïdaux d'évacuation des débris percés dans la paroi latérale (36); et deux échancrures (48) hélicoïdales correspondant respectivement auxdits orifices (46) et les entourant de manière à en définir le contour.

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