Pin and process for its manufacture

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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85/4, 10/5

F16B 31/02 (2006.01) F16B 39/06 (2006.01) F16B 39/28 (2006.01) F16B 39/02 (2006.01)

Patent

CA 1251343

ABSTRACT OF THE DISCLOSURE A threaded pin has flutes along the threads formed by roll-forming threads over a preformed section having either flat sides or dished sides. The major diameter of the threads lies along ridge crests bordering the flutes, and the minor diameter of the threads lies at the base of the flutes. The threads extend along the major diameter in each of the ridge crests for a distance on an order of magnitude of the distance across the mouth of each flute. The preformed section is formed by extrusion. The flutes provide space for material from a threaded collar forced into them to provide a thread lock. The circumferential extent of each ridge crest at the major diameter of the threads is of the order of the extent of the flutes at the major diameter of the threads. Thus, the distance across the mouths of the flutes is about the same as the distance along the major diameter of the thread on the ridge crest flanking each flute. The major diameter of the thread is the maximum diameter of the thread and this diameter is maximized in the ridge crest to maximize the area of the threads that resists axial tensile forces. The flutes are concave outward to provide a steep slope to the flutes, so that the material displaced therein provides high resistance to turning.

397204

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