EXCAVATION METHOD OF HAMMER GRAB, AND HAMMER GRAB

PROBLEM TO BE SOLVED: To provide a hammer grab that can clamp a shell before the start of closure to securely prevent the shell from floating, and is adjustable in pressing force for clamping.SOLUTION: There is provided an excavation method of a hammer grab including: positioning an up-down moving b...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	AKIBA TOSHIYASU, TORIKAI MITSUTOSHI, MINAMI MITSUSHIGE, SAITO MAMORU
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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