Drilling apparatus for producing drilled holes having an undercu

Details Drilling apparatus for producing drilled holes having an undercu Drilling apparatus for producing drilled holes having an undercu

1989-08-28

1991-07-16

Schwartz, Larry I.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

408 80, 408202, E21B 1710

Patent

active

050317091

ABSTRACT:
A drilling apparatus for producing undercut drilled holes and comprising a drill shaft including a bulge portion located between a stop ring mounted on the drill shaft and a drilling head mounted at the free end of the drill shaft, and which narrows towards opposite ends of the drill shaft.

REFERENCES:
patent: 790330 (1905-05-01), Terry
patent: 4010807 (1977-03-01), Fisher
patent: 4039266 (1977-08-01), O'Connell
patent: 4111270 (1978-09-01), Fisher et al.

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