Pneumatic rock drill

Details Pneumatic rock drill Pneumatic rock drill

2004-03-15

2008-10-28

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S417000, C173S199000, C173S104000

Reexamination Certificate

active

07441611

ABSTRACT:
A pneumatic rockdrill having a housing; a cylinder connected to a compressed air supply inlet by a set of air passages; an impact piston, at least part of which is reciprocable within the cylinder; and a controller for the supply of compressed air from the air supply inlet to the cylinder. At least one pair of contact surfaces are located at the interface between the piston and the cylinder, where those relatively moving parts contact one another. At least one water supply inlet and water paths connected to the water supply inlet(s) are configured so as in operation to convey water to a drilling tool to flush a hole being drilled, and to supply water to wet the contact surfaces.

REFERENCES:
patent: 3983788 (1976-10-01), Andersson et al.
patent: 4429752 (1984-02-01), Bailey et al.
patent: 4530408 (1985-07-01), Toutant
patent: 4819746 (1989-04-01), Brown et al.
patent: 4919221 (1990-04-01), Pascale
patent: 2004/0060740 (2004-04-01), Puttmann
patent: 1 231 192 (1960-09-01), None
patent: 438 013 (1935-11-01), None
patent: 647 023 (1950-12-01), None

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