Threaded fastener having a thread crest greater than its thread root and v angles on the crest and root
An interlocking thread with a tooth-cross-section that is wider at its crest than at its root and with “V” angles located both along the crest and the root which tightens into a tapped hole that has a similar thread cross-section.
1. A fastener, comprising:
a shaft having a first end including means to rotate said shaft,
said shaft having a thread pattern defined by a thread projecting from an outer periphery of said shaft and spiraling along its length, and a root gap separating adjacent threads;
said thread defined by an upper flank, a lower flank, a root adjacent said shaft and crest remote from said shaft,
said upper and lower flanks being separated by a “V” shaped indentation and diverging outwardly from each other away from said root and defining a dovetail, wherein an apex of said “V” shaped indentation has an acute angle; and
a “V” shaped protrusion protruding from said shaft in said root gap, the “V” shaped protrusion having a shape complementary to said “V” shaped indentation.
2. The fastener of claim 1 , wherein said “V” shaped indentation is defined by facing inner surfaces of said upper and lower flanks, the inner surfaces converging towards said root to form said “V” shape.
3. The fastener of claim 2 , wherein said two surfaces converge at said apex.
4. A method of fabricating the fastener of claim 1 , comprising:
a first flank forming step wherein said upper and lower flanks are formed on said shaft parallel to one another; and
a second flank forming step wherein said upper and lower flanks are swaged outwardly to define said “V” shaped indentation and dovetail.