SCREW JOINT STRUCTURE OF EXCAVATING TOOL

PROBLEM TO BE SOLVED: To prolong the life of a tool by preventing a sharp edge from being formed at an incomplete thread part even if the wear of a screw is advanced to some degree as well as before the wear, while suppressing the premature promotion of the wear of the screw. SOLUTION: In this screw...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	HISADA KIMIYA, HIWASA YONEO
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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