Percussion drill bit

Details Percussion drill bit Percussion drill bit

1976-04-20

1977-05-10

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

With fluid conduit lining or element

285 18, 285332, 285390, 403334, 403343, E21C 1500

Patent

active

040222870

ABSTRACT:
The invention relates to a drill bit for use in percussion drilling. The drill bit has a solid bit body, has cutting members on its face and a centrally disposed rod-receiving hole in its rear portion. The hole has, in part, a conical internal surface and a cylindrical internal surface in front of said conical internal surface. Said cylindrical internal surface is provided with an internal thread at a distance remote from the bottom of the hole. A cooperating drill rod has a forwardly tapering portion with a conical exterior face complementary to the conical interior surface in the hole of the drill bit and an external thread on its forepart.

REFERENCES:
patent: 1849066 (1932-03-01), Bridges
patent: 3062306 (1962-11-01), Hjalsten
patent: 3213951 (1965-10-01), Eeles
patent: 3876234 (1975-04-01), Harms

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