Core drill

Details Core drill Core drill

2005-09-20

2005-09-20

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Casing shoe type

C175S394000, C175S403000

Reexamination Certificate

active

06945339

ABSTRACT:
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.

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