Hole opener with improved rotary cutter mounting

Details Hole opener with improved rotary cutter mounting Hole opener with improved rotary cutter mounting

E - Fixed Constructions

21

B

255/75

E21B 10/00 (2006.01) E21B 10/10 (2006.01) E21B 10/18 (2006.01) E21B 10/28 (2006.01)

Patent

CA 1062698

Abstract This earth boring drill apparatus has a cutter mounting leg extending from one side of a drive stem and a removable cutter assembly, including a fixed shaft and cutter journaled for rotation on the shaft supported between the drive stem and the mounting leg. The stem has a bore for slidably receiving the inner end of the shaft. The cutter mounting leg terminates in an end surface extending parallel to the axis of rotation of the bore and shaft. A shaft supporting lug projecting from the outer end of the shaft has a surface which is parallel to the end surface on the leg. The opposed surfaces respectively have a V-shaped projection and mating groove which provide lateral alignment and prevent shaft rotation while permitting the shaft to be movable in an axial direction by an amount sufficient to permit the shaft to be withdrawn from the bore. Bolts extending between the mounting leg and the shaft at an angle clamp the mating surfaces of the groove and projection together and also clamp a pair of flat spacers between the mounting leg and the outer end of the shaft to lock the shaft in the bore.

278297

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