Device for forming an undercut in a drilled hole

Details Device for forming an undercut in a drilled hole Device for forming an undercut in a drilled hole

1990-06-29

1991-09-03

Bilinsky, Z. R.

Boring or penetrating the earth

With above-ground guide for relatively advancing tool

175417, 408 56, E21B 100

Patent

active

050444514

ABSTRACT:
A device for forming an undercut in a drill hole includes a drilling tool having a shank receivable in a chuck of a drilling machine and having a convex collar supported on a corresponding concave bearing surface of a bearing element of the device. The bearing element has a bore that communicates the bearing surface with an opening which communicates with a source of a lubricant liquid. The collar has at least one groove for conducting the liquid into the drill hole to the drill bit head of the tool.

REFERENCES:
patent: 4111270 (1978-09-01), Fischer et al.

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