with spring-mounted reciprocating masses, e.g. with air cushion

Introduced: January 2000

Last revised: January 2006

Full Title

Percussion drilling > with a reciprocating impulse member > driven by a rotating mechanism > with spring-mounted reciprocating masses, e.g. with air cushion

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

1 direct subcode

Child Classifications

Navigate with arrow keys, Enter to open

E21B 1/18 with elastic joining of the drive to the push-rod by double buffer springs