Formation of fasteners and connections with variable pitch threa

Details Formation of fasteners and connections with variable pitch threa Formation of fasteners and connections with variable pitch threa

1989-03-06

1990-09-18

Eley, Timothy V.

10 86R, B21D 5320, F16B 3930

Patent

active

049568884

ABSTRACT:
A method of forming a composite nut having a threaded connection in which the axial load between a screw and nut in a tightened condition of the connection is distributed more uniformly between different turns of the engaged threads than in a standard threaded connection by forming the nut to have a pitch which increases progressively as the thread advances helically in a predetermined axial direction, while the other thread desirably has a pitch which is uniform along its length. The pitch of the first thread may increase at a rate predetermined to compensate for differences in the tensile force which is applied to the screw and the compressive force applied to the nut at different points along their length when the screw and nut are tightened together to a prestressed condition.

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