Down-hole impacting means, e.g. hammers (boring rams E21B11/02)

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Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers (boring rams E21B11/02)

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• E21B 4/08 impact being obtained by gravity only, e.g. with lost-motion connection
• E21B 4/10 continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
• E21B 4/12 Electrically operated hammers
• E21B 4/14 Fluid operated hammers