Cutter mounting for a large hole earth boring bit

Details Cutter mounting for a large hole earth boring bit Cutter mounting for a large hole earth boring bit

E - Fixed Constructions

21

B

255/77

E21B 10/00 (2006.01) E21B 10/10 (2006.01)

Patent

CA 1062244

Abstract of the Disclosure A large hole earth boring bit with a clevis-type coupling for mounting the rolling cutters to the bit. The mounting apparatus includes a first member having two ends with aligned holes and a second member having its end in- serted between the two ends. The end of the second member has an aperture that is spaced slightly out of alignment with the apertures in the first member, providing a generally elliptical passage. Bearing surfaces prevent them from coming into alignment. A pair of wedges are inserted into the elliptical passage and drawn together to exert a force in the direction toward alignment of the apertures. The force exerted is transmitted into the base, positively lock- ing the two members together. -2-

288959

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