Device for producing drill holes having an undercut

Details Device for producing drill holes having an undercut Device for producing drill holes having an undercut

1989-10-27

1990-10-16

Neuder, William P.

Boring or penetrating the earth

With above-ground guide for relatively advancing tool

408 72R, E21B 100

Patent

active

049628208

ABSTRACT:
A drilling device for producing drill holes having an undercut and comprising a drilling tool including a drilling shaft, a drilling head with a drilling plate located at the free end of the drilling shaft, a stop sleeve mounted on the drilling shaft and having an opening for guiding the drilling shaft, a stop collar fixedly connected with the drilling shaft and located inside of the stop sleeve, and an annular spring for securing the stop collar in the area of an opening of the stop sleeve which is located above the guide opening.

REFERENCES:
patent: 2402353 (1946-06-01), Trantmann
patent: 3334948 (1967-08-01), Qvarnstrom
patent: 4154311 (1979-05-01), Fischer et al.

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