E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
10/25, 255/30
E21B 17/042 (2006.01) F16B 33/02 (2006.01) F16L 15/00 (2006.01) F16L 15/06 (2006.01)
Patent
CA 1316301
P-301 ELLIPTICAL THREAD DESIGN ABSTRACT OF THE DISCLOSURE A screw structure (10) is provided for male and female threads (14) having at least one thread (14) extending helically along a cylindrical support (12) member in spaced thread turns. A root portion (22) extends between adjacent thread (14) turns and has a curvature defined by a portion of an ellipse (24) for providing improved stress reduction during periods of severe loading.
587831
Gowling Lafleur Henderson Llp
Sandvik Rock Tools Inc.
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