Rotary percussion drill bit with a four-groove drill helix shaft

The drill has a convex coil bar (4) projecting from a concave grooving base (5) up to a minimum circumscribed circle radium (H) in a four-fold rotation-and mirror-symmetrical coil cross section, and forming a rear section (7) with respect to a bar width (S). The grooving base is designed in a concav...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	STARKMANN, JOSEF, KOCH, OLAF, DOMANI, GUENTHER
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BORING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERFORMING OPERATIONS TRANSPORTING TURNING
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