Rock drill boom structure

Details Rock drill boom structure Rock drill boom structure

E - Fixed Constructions

21

B

255/35

E21B 15/04 (2006.01) E21B 3/04 (2006.01)

Patent

CA 1094541

Abstract A rock drill boom structure has a feed beam mounted on one end of a loom. The boom is carried by a guide bushing with which it forms a kelly joint. The guide bushing is pivotably carried by a rotatable large diameter disc that is supported and guided at its periphery. The boom can be withdrawn to extend rearwardly through a hole in the disc.

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