Hole coring system

Details Hole coring system Hole coring system

2006-12-27

2009-02-03

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Casing shoe type

C175S403000, C175S408000

Reexamination Certificate

active

07484578

ABSTRACT:
An apparatus for drilling holes in a substrate wherein a mandrel is anchored to the substrate. A hollow drill bit rotates about the mandrel via a drive motor and is a guided along a length of the mandrel.

REFERENCES:
patent: 3094179 (1963-06-01), Lines
patent: 3810514 (1974-05-01), Viscovich
patent: 5393175 (1995-02-01), Courville
patent: 5735645 (1998-04-01), Dungs
patent: 6881016 (2005-04-01), May
patent: 2004/0191014 (2004-09-01), May
Core Drill Rig and Hand-held Core Drill, C.S. Unitec, Inc., 1 page.
Bi-Metal Hole Saw Kits with Pilot Drill, Lenox Co., 2 pages.

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