Hole coring system with lever arm

Details Hole coring system with lever arm Hole coring system with lever arm

2008-01-17

2010-02-09

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Processes

C175S162000, C175S195000, C175S220000, C175S402000, C175S403000, C175S408000

Reexamination Certificate

active

07658242

ABSTRACT:
A hole coring system for drilling large diameter holes with a handheld tool. The drill bit is guided by a mandrel attached to the concrete and serves as a central guidepost that ensures precise centering of the drill bit. Commonly available tools may be used to rotate the drill bit. A lever arm may be attached to the tool and used to resist any torquing action. Additionally, a brace may be attached to the lever arm which may be used to resist any torquing action.

REFERENCES:
patent: 5393175 (1995-02-01), Courville
patent: 7484578 (2009-02-01), Duncan
CS UNITEC, “Core Drill”, 1 pg.
LENOX Company, “Hole Saw Kits”, 2 pgs.

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