Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Patent
1981-07-06
1983-02-08
Novosad, Stephen J.
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
Fluid or cuttings directing or receiving means engaging bore...
175211, 175408, E21C 700
Patent
active
043724019
ABSTRACT:
A tool for drilling a cylindrical hole with an enlarged end undercut portion comprises a shank with cutting edges and a drill collet screwed to the shank by a knuckle thread. The collet is provided with a stop collar having a semispherically-shaped face supported in a matingly configurated recess provided in a stop plate so as to form a swivel bearing. A portion of the collet is closed by a bell connected to the stop plate and formed with a central hole to receive the shank of the tool.
REFERENCES:
patent: 1373996 (1921-04-01), Clore
patent: 1774884 (1930-09-01), Hansen
patent: 1983488 (1934-12-01), Pedigo
patent: 3536149 (1970-10-01), Laird
patent: 4010807 (1977-03-01), Fischer
patent: 4111270 (1978-09-01), Fischer et al.
patent: 4209069 (1980-06-01), Smith
patent: 4223748 (1980-09-01), Barendsen
Falk Joseph
Novosad Stephen J.
Striker Michael J.
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