Raise boring head and rolling cutter arrangement therefor

Claim 1

In a rolling cutter; a rotatable outer part, a central support shaft rotatably supporting said outer part and having end portions projecting axially beyond the respective ends of said outer part, saddle means having generally parallel legs fixed relative to each other and spaced to receive said rotatable part therebetween, a slot extending into one end of each said leg part and each having spaced parallel side walls and a bottom wall perpendicular to the side walls, each end portion of said central support shaft being receivable into a respective slot and having flat parallel sides engaging the side walls of the slot and a flat bottom perpendicular to said sides and engaging the bottom wall of the respective slot, each said leg having at least one hole extending therethrough in a direction substantially parallel to said support shaft and spaced downwardly in the respective leg from said bottom wall of said slot, a barrel nut removeably mounted in each hole, and a bolt for each barrel nut extending downwardly through the end portion of the support shaft which is disposed above the nut and downwardly through the portion of the respective leg disposed between the bottom wall of the slot and the said hole in which the barrel nut is mounted and threadedly engaging the barrel nut whereby each said end portion is fixed in the respective slot and clamped against the bottom wall thereof.