EXCAVATION WORK ROD

PROBLEM TO BE SOLVED: To surely and easily connect a hydraulic supply path of a screw auger rod against wobbling in a rotating direction of a joint engaging part by matching displacement generated from a gap of male and female joints and absorbing a relief margin.SOLUTION: In an excavation work rod...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	KOBAYASHI MAKOTO, NAKAYAMA KANAME
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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