Patent ID: 6929077
Filing Date: 2005-08-16
Classification: E21B

Abstract:
1. A boring head for rotary drilling in earth and rock formations comprising: a main body having a mounting surface and at least one saddle carried by the main body, the saddle including a pair of spaced apart legs, each leg having a first curved support surface and a first hole extending through the first curved support surface; a shaft defining a longitudinal axis and including spigots at its opposite ends, the spigots being mounted in respective legs, each spigot including a second curved support surface seated on a respective first curved support surface, each spigot provided with a second hole formed therein; each spigot and its associated leg having interengaging stop surfaces for preventing rotation of the shaft relative to the legs in one direction about the longitudinal axis of the shaft, wherein the first hole of each spigot is aligned with the second hole of its respective leg when the stop surfaces are engaged; a fastener spaced from the stop surfaces and extending through each first hole and its associated second hole aligned therewith for holding the stop surfaces together; and a rotary cutter body rotatably journalled on the shaft.