with elastic joining of the drive to the push-rod by double buffer springs

Full Title

Percussion drilling > with a reciprocating impulse member > driven by a rotating mechanism > with spring-mounted reciprocating masses, e.g. with air cushion > with elastic joining of the drive to the push-rod by double buffer springs

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