Drilling head

Details Drilling head Drilling head

1976-06-01

1978-03-14

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175409, E21C 1304, E21C 1300

Patent

active

040786218

ABSTRACT:
A drilling apparatus, especially for boring holes in the earth, having a drill as an integral unit including a first portion for starting the hole, a second portion for reaming the hole, and a third portion for maintaining the hole cylindrical. The drill is selectively fastened to a conventional auger. Extension plates may be attached to the third portion for drilling holes of different diameters. As an alternate embodiment, the first portion of the drill may include an auger, the drill and the auger being formed from a flat stock. At least some of the sides or cutting edges of the first, second or third portions being carbided or fabricated from extremely hard steel.

REFERENCES:
patent: 1332841 (1920-03-01), Jansen
patent: 1504852 (1924-08-01), Wright
patent: 1858744 (1932-05-01), Lunsford
patent: 2504978 (1950-04-01), Henning
patent: 2644670 (1953-07-01), Baker et al.
patent: 2644673 (1953-07-01), Baker
patent: 2673717 (1954-03-01), Bacon
patent: 2887300 (1959-05-01), Meredith
patent: 2972389 (1961-02-01), Green et al.
patent: 3117637 (1964-01-01), Mortensen
patent: 3447616 (1969-06-01), Granat

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