Drilling device for producing drill holes with an undercut

Details Drilling device for producing drill holes with an undercut Drilling device for producing drill holes with an undercut

1989-10-13

1990-10-23

Neuder, William P.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With suction pump inlet communicating with bore bottom

408 69, E21B 1026

Patent

active

049644769

ABSTRACT:
A drilling device for producing drill holes with undercuts and comprising a drill bit, a drill bit holder for receiving the drill bit and having a suction chamber, and a suction bell surrounding the drill bit holder and communicating with the suction chamber therein, the stem of the drill bit having a continuous axial bore communicating with the suction chamber and a plurality of slots arranged in a region of a cross-sectional enlargement of the stem.

REFERENCES:
patent: 2919901 (1960-01-01), Sandvig
patent: 3022840 (1962-02-01), Hohes et al.
patent: 3442337 (1969-05-01), Astrom
patent: 3850254 (1974-11-01), Hirdes
patent: 3948330 (1976-04-01), Langford, Jr.
patent: 4097176 (1978-06-01), Wanner et al.

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