Patent ID: 9689208
Date: 2017-06-27
CPC Classifications: E21B,Y10T

Claim:
1. A hole opener comprising: a shaft comprising a first axial portion having a first diameter and a second axial portion having a second diameter, the second diameter being greater than the first diameter, the second axial portion including a plurality of axial slots extending from a surface of the second axial portion radially inwardly and spaced circumferentially about the second axial portion, the second axial portion including a pair of fastening wings for each of the plurality of axial slots that extend outwardly from the surface of the second axial portion, adjacent facing surfaces of the pair of fastening wings aligned with adjacent facing surfaces of one of the plurality of axial slots; a blade assembly comprising a straight edge configured to engage one of the plurality of axial slots and extend radially outwardly therefrom between the pair of fastening wings associated with the axial slot, the blade assembly comprising an at least partially arcuate cutting edge configured to engage an inner surface of a bore hole, the first axial portion, the second axial portion, and the plurality of pairs of fastening wings being integrally formed.