DRILLING DEVICE

PROBLEM TO BE SOLVED: To provide a drilling device capable of drilling with low torque and improving replacement operability for a drill bit.SOLUTION: A reverse gear device 9 can rotate a second drill bit 8 reversely to a rotating direction of a first bit drill 6, so the second drill bit 8 can cance...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	KAWAMURA YOHEI, MIYAJI TOSHIYUKI, MURAKAMI KAZUTOSHI
Format:	Patent
Sprache:	eng
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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