Joints and connections – Distinct end coupler – Separate screw or pin-type connections
Patent
1979-09-21
1981-10-20
Kee Chi, James
Joints and connections
Distinct end coupler
Separate screw or pin-type connections
403307, 403343, 285334, 285390, 411411, F16B 700
Patent
active
042957516
ABSTRACT:
A coupling thread structure for percussion drill elements including a rod (10) having an external thread (14), and a sleeve (24) having an internal thread (26) with the threads, when the sleeve and rod are coupled, having abutting (16) and non-abutting (18) flanks and with the flanks being joined by bottom (22) and crest (20) portions, wherein the threads have at least two starts; the abutting flanks (16) are substantially straight along their whole abutting contact portions (CL) and form an angle of between 10.degree. and 25.degree., preferably 15.degree. to 20.degree., with the drill axis; the pitch angle of the threads is in the range 9.degree. to 20.degree., preferably 11.degree. to 16.degree.; the crest portions (20) are substantially straight and intersect the abutting flank (16) portions at a well defined edge (30); the non-abutting flanks (18) have a flank angle which is considerably greater than that of the abutting flanks (16); the flank angle of the non-abutting flanks (18) is in the range 50.degree. to 80.degree., preferably 65.degree. to 75.degree., with respect to the drill axis; and the bottom portions (22) of the threads (14,26) are curved.
REFERENCES:
patent: Re27284 (1972-02-01), Hjalsten et al.
patent: 3645570 (1972-02-01), Johansson et al.
patent: 3717368 (1973-02-01), Czarnecki et al.
patent: 3822952 (1974-07-01), Johansson et al.
patent: 4040756 (1977-08-01), Donegan
patent: 4084829 (1978-04-01), Falchle et al.
Engineering and Mining Journal, vol. 161, No. 5, May 1960, p. 98-101, Anderson, Floyd "43 Years of Progress in Drill-Steel Thread Design".
Boart International Limited
Chi James Kee
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