Drill steel

Details Drill steel Drill steel

1974-12-16

1976-06-29

Kundrat, Andrew V.

Joints and connections

Screw or cam

403307, F16B 718

Patent

active

039663418

ABSTRACT:
A drill steel of the type employed in rock drilling and more particularly a drill steel having improved stress distribution and relief means.

REFERENCES:
patent: 2641488 (1953-06-01), Dunn et al.
patent: 3574373 (1971-04-01), LeDerf et al.

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