Drilling device for producing drill holes with undercut

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

1989-01-23

1990-10-23

Dang, Hoang C.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

Fluid or cuttings directing or receiving means engaging bore...

173 33, 175213, 175220, 175323, 175408, 408241G, E21B 1710, E21B 728, E21C 900

Patent

active

049644750

ABSTRACT:
A drilling device for producing drill holes with undercuts comprises a drill having a drill shaft with extending drill blades, a shoulder projecting from the drill shaft, and a guiding sleeve surrounding the drill shaft between the shoulder and the drill blades, the guiding sleeve having two ends provided with openings of different sizes, the guiding sleeve having a sleeve edge which forms a support for the shoulder and a wall abutment for the collar.

REFERENCES:
patent: 4111270 (1978-09-01), Fischer et al.
patent: 4372401 (1983-02-01), Fischer

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