Boring or penetrating the earth – Bit or bit element – Core forming type
Patent
1995-03-24
1996-03-12
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Core forming type
175413, 175428, 175430, E21B 1062, E21B 1046, E21B 1048
Patent
active
054978432
ABSTRACT:
In a hollow earth auger head assembly a plurality of bit-holding pockets are provided, spaced circumferentially from one another around an open mouth of an auger head, and bits taken selectively from a multiplicity of types of cutting teeth, have a shank portion that seats in any and all of the pockets. A retaining pin extends chordally, off set from a diameter, through holes in the pocket and into a retaining pin receiver in the bits. In those bits that are intended to rotate in the pocket, the retaining receiver takes the form of an annular channel. In those bits that are not supposed to rotate, the retaining pin extends through a linear passage in or along a flat on the bit shank. In certain embodiments of sockets a chordal plug or weldment defines a space with one flat side against which a tail of the shanks of certain bits designed not to rotate bear.
REFERENCES:
patent: 1271396 (1918-07-01), Walker
patent: 1512841 (1924-10-01), Gamble
patent: 1765296 (1930-06-01), Berry
patent: 1774084 (1930-08-01), Cooney
patent: 1846177 (1932-02-01), Bascom et al.
patent: 1880215 (1932-10-01), Simmons
patent: 2080116 (1937-05-01), Dean
patent: 2769614 (1956-11-01), Zeni
patent: 3830321 (1974-08-01), McKenry et al.
patent: 4667754 (1987-05-01), Diedrich
Burns Raymond W.
Oberlander Kyle
Central Mine Equipment
Novosad Stephen J.
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