Compressed air percussive mechanism for a down hole hammer and down hole hammer

Compressed air percussive mechanism for a down hole hammer and down hole hammer

Pressure-air driven percussion device for a down-the-hole drill ( 1 ) with a hammer-piston ( 86 ) which is axially reciprocally movable in a hammer-piston chamber ( 18 ) through a driving device ( 9 ), said hammer-piston ( 6 ) in operation acting with a hammer-end ( 16 ) against an upper end ( 17 )...

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Hauptverfasser: EKWALL BERNDT, JACOBSSON TORBJORN
Format: Patent
Sprache:eng
Schlagworte:
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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creator EKWALL BERNDT
JACOBSSON TORBJORN
description Pressure-air driven percussion device for a down-the-hole drill ( 1 ) with a hammer-piston ( 86 ) which is axially reciprocally movable in a hammer-piston chamber ( 18 ) through a driving device ( 9 ), said hammer-piston ( 6 ) in operation acting with a hammer-end ( 16 ) against an upper end ( 17 ) of a drill bit ( 2 ) which is positioned inside a chuck ( 3 ), wherein 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 ( 2 ) has been moved passed a predetermined distance in the percussion direction. The drill bit ( 2 ) is sealingly slidingly supported in a drill bit bushing ( 5 ), and the hammer-end ( 16 ) of the hammer-piston ( 6 ) is formed so that it sealingly cooperates with the drill bit bushing ( 5 ) in said positions in order to form said air-cushion ( 19 ). The invention also concerns a down-the-hole drill ( 1 ).
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The drill bit ( 2 ) is sealingly slidingly supported in a drill bit bushing ( 5 ), and the hammer-end ( 16 ) of the hammer-piston ( 6 ) is formed so that it sealingly cooperates with the drill bit bushing ( 5 ) in said positions in order to form said air-cushion ( 19 ). The invention also concerns a down-the-hole drill ( 1 ).</abstract><edition>7</edition><oa>free_for_read</oa></addata></record>
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subjects EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
title Compressed air percussive mechanism for a down hole hammer and down hole hammer
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