F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
61/12.1
F16L 19/02 (2006.01) E21B 17/08 (2006.01) F16L 19/025 (2006.01)
Patent
CA 1262641
ABSTRACT An extended life coupling for joining tubular members in an end-to-end relationship is disclosed. The coupling is of simply design having only three components: a pin, a box and a threaded lock ring. An external compressive axial preload places a torus on the pin in axial compression. Make-up of the lock ring maintains the compressive strain on the torus and the lock ring when the axial make-up force is removed. Thereafter, increased tensile loading on the pin and box is partially absorbed in benign compressive stress of the locking ring. By controlling the geometry of the coupling such that the stiffness of the torus is high compared to the stiffness of the box and the stiffness of the lock ring, the fatigue life of the coupling caused by applied cyclic tensile forces is enhanced.
517063
Lin Shaw-Wen
Roche Joseph R.
Hydril Company
Lin Shaw-Wen
Marks & Clerk
Roche Joseph R.
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