Percussive down-the-hole rock drilling hammer and piston therefo

Details Percussive down-the-hole rock drilling hammer and piston therefo Percussive down-the-hole rock drilling hammer and piston therefo

2000-02-14

2000-10-17

Smith, Scott A.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

173 17, 173 78, E21B 406

Patent

active

061316725

ABSTRACT:
A down-the-hole percussive drill comprises a casing, a drill bit mounted at a lower end of the casing, a hollow feed tube fixed within the casing and extending along a center axis thereof, and a piston mounted for axial reciprocation within the casing for transmitting impacts to the drill bit. The upper portion forms a downwardly facing surface at the junction between the upper and lower portions. Passages for conducting lubricant-containing pressurized air are formed in the piston. At least one of those passages constitutes a vertical recess formed in the outer periphery of the piston. The piston includes a radially outwardly projecting rib disposed between upper and lower ends of the recess. Air is blocked from traveling past the rib until the rib becomes located opposite an annular groove formed in an inner surface of the casing.

REFERENCES:
patent: 3712388 (1973-01-01), Curington
patent: 4015670 (1977-04-01), Rear
patent: 4106571 (1978-08-01), Stone
patent: 4446929 (1984-05-01), Pillow
patent: 4790390 (1988-12-01), Sweeny
patent: 4921052 (1990-05-01), Rear
patent: 4923018 (1990-05-01), Meek
patent: 5107944 (1992-04-01), Gustafsson
patent: 5131476 (1992-07-01), Harrington
patent: 6062322 (2000-05-01), Beccu et al.

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