Drill element for percussion drilling

Details Drill element for percussion drilling Drill element for percussion drilling

1986-02-21

1988-08-02

Kazenske, E. R.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

403307, 403343, F16B 718, E21B 1702

Patent

active

047608870

ABSTRACT:
The invention relates to a drill element for percussion drilling, the element having a cylindrical screw thread having one single entry. The screw thread, that is intended for thread diameters of less than 30 mm, has a pitch of less than 12 mm, a shoulder angle of less than 69.degree., and a pitch angle of less than 11.degree. but more than 5.6.degree..

REFERENCES:
patent: 3645570 (1972-02-01), Johansson et al.
patent: 3717368 (1973-02-01), Czarnecki et al.
patent: 4295751 (1981-10-01), Holmberg
patent: 4332502 (1982-06-01), Wormald et al.

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