DRILLING BIT

PROBLEM TO BE SOLVED: To provide a drilling bit capable of efficiently discharging cuttings around a central axis in the tip surface of a bit body so as to increase drilling speed.SOLUTION: A drilling bit 10 is provided with a cylindrical bit body 1 which is rotated around a central axis O, a plural...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	OTA HIROSHI, HISADA KIMIYA
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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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a drilling bit capable of efficiently discharging cuttings around a central axis in the tip surface of a bit body so as to increase drilling speed.SOLUTION: A drilling bit 10 is provided with a cylindrical bit body 1 which is rotated around a central axis O, a plurality of drilling chips 3 protrusively formed on a tip surface 2 of the bit body 1 and a discharge groove 4 which is recessed from the tip surface 2 of the bit body 1 and which is formed so as to be extended in the radial direction. At least one portion of the discharge groove 4 is arranged in a rotational locus Caround the central axis O of an innermost peripheral chip 31A disposed closest to the central axis O of the bit body 1, among the drilling chips 3.