DEVICE FOR WIDENING A BOREHOLE IN THE GROUND

The device comprises a drive rod on which are mounted centring rollers, and a widening element whose drive shaft is connected to the drive rod. A series of cam sleeves (7) capable of rotating about the longitudinal axis (10) of the drive shaft (4), together with an end sleeve, are fitted on the driv...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	BOBYLEV, ANDREI LEONIDOVICH, BOBYLEV, LEONID MATVEEVICH
Format:	Patent
Sprache:	eng ; fre ; rus
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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