Threaded coupling

Details Threaded coupling Threaded coupling

1987-07-14

1989-08-29

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

411366, 403307, 285390, F16B 3504, F16L 1500

Patent

active

048612090

ABSTRACT:
A threaded coupling for a high frequency percussion drill assembly comprises a rod and a sleeve having external and internal threads, respectively. The threads are of the asymmetrical type and make contact along opposing shoulder portions disposed on only one side of each crown portion. The threads have a maximum diameter from 30 to 40 mm, a pitch of 7 to 11 mm, and a height from 1.2 to 1.6 mm. The parts of the root and crown portions located immediate adjacent the contacting shoulder portions have radii from 3 to 5 mm.

REFERENCES:
patent: 1953095 (1934-04-01), Baker
patent: 3586353 (1971-06-01), Lorenz
patent: 3645570 (1972-02-01), Johansson et al.
patent: 4295751 (1981-10-01), Holmberg

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