CORE DRILL

CORE DRILL

A plurality of chip evacuating grooves ( 16, 26, 36, 46a, 46b ) in a vertical direction in parallel with a rotational axis of a core main body ( 14 ) are formed at an outer peripheral face of the core main body ( 14 ) in a circumferential direction from a lower end portion to an upper end portion of...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HIRANUMA, TOSHIO, KOSHIBA, TOMOHIRO, TSUTSUMI, KOUICHI, ISHIZEKI, MASAKAZU
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BORING
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
TRANSPORTING
TURNING
WORKING CEMENT, CLAY, OR STONE
WORKING STONE OR STONE-LIKE MATERIALS
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Beschreibung
Zusammenfassung:A plurality of chip evacuating grooves ( 16, 26, 36, 46a, 46b ) in a vertical direction in parallel with a rotational axis of a core main body ( 14 ) are formed at an outer peripheral face of the core main body ( 14 ) in a circumferential direction from a lower end portion to an upper end portion of the core main body ( 14 ) in a cylindrical shape provided with a drilling blade ( 15 ) at a lower end edge thereof. Further, a sectional area of the chip evacuating groove ( 16 ) is formed to gradually increase from a lower end to an upper end of the core main body ( 14 ). Further, a number of projections ( 52, 62, 70, 72 ) are formed at the outer peripheral face of the core main body ( 14 ) between the chip evacuating grooves.