Drilling tool having frictionally rotatable drilling head

Details Drilling tool having frictionally rotatable drilling head Drilling tool having frictionally rotatable drilling head

1989-05-31

1990-07-24

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

175394, E21B 1044, E21B 1722

Patent

active

049429310

ABSTRACT:
A drilling tool is proposed which is preferably suitable for making apertures in concrete work or masonry is fissured rock. To avoid damaging an interchangeable conveying helix (4), the connection between the conveying helix (4) and drilling head (3) is made as a frictional-resistance connection (FIG. 2).

REFERENCES:
patent: 2790623 (1957-04-01), Pate et al.
patent: 3888320 (1975-06-01), Maxwell
patent: 4699226 (1987-10-01), Muller et al.
European Search Report of Oct. 26, 1989, for European Application EP 89 10 9302.

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