Cup-shaped rock drill head

Details Cup-shaped rock drill head Cup-shaped rock drill head

2006-06-13

2006-06-13

Suchfield, George (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S415000, C299S100000

Reexamination Certificate

active

07059432

ABSTRACT:
A cup-shaped drill head with an inner conical surface (2) for force-locking connection with an exterior conical surface (3) of a driving drill shaft (4), which at the leading end changes over into a cup base (5) with a center point (P), whereby in the change over from the cup base (5) to the inner conical surface (2) a lesser curvature (K) is present than at the center point (P).

REFERENCES:
patent: 3213951 (1965-10-01), Eeles
patent: 4022287 (1977-05-01), Lundstrom et al.
patent: 4223587 (1980-09-01), Deutschenbaur
patent: 4716976 (1988-01-01), Isakov

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