Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent
1986-05-12
1988-06-14
Novosad, Stephen J.
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
E21B 1722, E21B 17046
Patent
active
047505729
ABSTRACT:
A drilling tool is proposed which is provided with an interchangeable conveying spiral and an axial supporting device of the conveying spiral. To achieve a cost-effective and simply constructed, but at the same time reliable axial support of the conveying spiral (14), an elastic sleeve (15) is held in a recessed groove (19) in the drill shank (11) against axial slipping by a support ring (17).
REFERENCES:
patent: 1116154 (1914-11-01), Stowers
patent: 2116359 (1938-05-01), McCann
patent: 2400478 (1946-05-01), Beck
patent: 2675257 (1954-04-01), Specht
patent: 2831659 (1958-04-01), Kukuchek et al.
patent: 3372763 (1968-03-01), Fisher
patent: 4393947 (1983-07-01), Lutze et al.
Hawera Probst GmbH & Co.
Novosad Stephen J.
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