Drilling tools

Details Drilling tools Drilling tools

1986-01-06

1987-09-29

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175410, 175414, 407 42, 408230, E21B 1036, E21B 1044

Patent

active

046963553

ABSTRACT:
A drilling tool for percussion drilling machines is proposed which has an increased endurance strength or fatigue strength when used in percussion drilling machines having a high striking speed. For this purpose, the carbide cutting tip (11) is arranged transversely to the flute runout (12, 13) so that the effective moment of resistance area in the area of the groove root (22) of the recessed groove (14) is not weakened by flute runout surfaces.

REFERENCES:
patent: 3718067 (1973-02-01), Fischer
patent: 3845829 (1974-11-01), Schaumann
patent: 4314616 (1982-02-01), Rauckhorst et al.

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