Compressed air percussive mechanism for a down hole hammer and down hole hammer
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United States of America Patent
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Jul 20, 2010
Grant Date -
Aug 11, 2005
app pub date -
Nov 29, 2002
filing date -
Jan 23, 2002
priority date (Note) -
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Abstract
Pressure-air driven percussion device for a down-the-hole drill with a hammer-piston which is axially reciprocally movable in a hammer-piston chamber through a driving device. The hammer-piston in operation acting with a hammer-end against an upper end of a drill bit which is positioned inside a chuck. An air-cushion for reducing percussive power is arranged to be formed at the hammer-end of the hammer-piston in positions where the drill bit has been moved past a predetermined distance in the percussion direction. The drill bit is sealingly slidingly supported in a drill bit bushing, and the hammer-end of the hammer-piston is formed so that it sealingly cooperates with the drill bit bushing in the positions in order to form the air-cushion.
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