IPC Subgroup
E21B 4/1 continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
Introduced: January 1980
Last revised: January 2006
Full Title
Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers > continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS