Dual bushing centralizer

A sound insulating rock drill front centralizer comprising:

• a stinger rigidly attached to the structure of a rock drill feed comprising a resilient elastomeric material having an axial bore therethrough allowing passage of a drill rod, said stinger also having a generally centrally located cavity intersecting with said axial bore and an aperture intersecting with said cavity allowing drilling effluent to exit said stinger in a direction generally perpendicular to said axial bore, and said stinger having a face toward a drilling surface capable of deformation providing a seal about a drill bit at the end of said drill rod when said drill bit engages the drilling surface;
• a first bushing encapsulated within said elastomeric material for engaging the drilling surface and coaxially aligning the drill bit with said axial bore as the drill bit enters the drilling surface, said first bushing allowing a drill bit and drill rod passage therethrough, said first bushing encapsulated within said stinger between said cavity and said drilling surface;
• a second bushing encapsulated within said elastomeric material for coaxially aligning said drill rod with said axial bore in said stinger, said second bushing allowing said drill rod passage therethrough, said second bushing encapsulated within said stinger between said rock drill feed structure and said cavity whereby said second encapsulated bushing is maintained out of contact with said rock drill feed structure and said first encapsulated bushing;
• and
• means for rigidly attaching said stinger to the structure of the rock drill feed.