Method for correcting translational misalignment between male and female fastening components

Abstract

A method for correcting translational misalignment between a male fastening part (10) and a female fastening part (30) to prevent wrong screwing, the method comprising: placing a male fastening part (10) ) of the leading end (14) is inserted into the female fastening part (30), wherein the female fastening part (30) includes: at least one female fastening thread formed on the female fastening part In the interior of (30); at least one female lead thread (31 ) formed in said interior of said female fastening part (30), said at least one female lead thread (31 ) at the crest has a groove (32) in it, and wherein said male fastening part (10) comprises: a shank having a leading end for insertion into said interior of said female fastening part (30); at least a male fastening thread formed on the exterior of said shank as a plurality of thread turns adapted to mate with said at least one female fastening thread; Formed on said outer portion of said shank at said leading end (14), said at least one male leading thread (17) is at least half a turn around said shank and includes a curved profile defined by an arc, The arc has a radius approximately equal to the radius of the arc tangent to both flanks of the thread profile of the at least one male fastening thread and located below the pitch diameter of the at least one male fastening thread ; and rotating said fastening parts (10, 30) relative to each other while said at least one male lead thread (17) of said male fastening part (10) passes over said female fastening part ( 30) of said groove (32) in said crest of said at least one female lead thread (31 ) and does not screw into said groove (32).

Description

technical field [0001] The present invention relates generally to the field of threaded fasteners, such as screws and bolts, and more particularly, to mistake-tightening resistant fasteners. Background technique [0002] Threaded fastener technology is fundamental to the construction or fabrication of most manufactured items such as machines, automobiles, trains, airplanes, engines, and the like. Threaded fasteners may be bolts, screws, studs, rods, or have uniform, non-uniform, or Other generally circular components of tapered external helical threads. For proper engagement of an externally threaded fastener with an internally threaded fastener, the longitudinal axis of the externally threaded component must generally be substantially collinear with the longitudinal axis of the internally threaded component. Furthermore, proper engagement of an externally threaded fastener with an internally threaded fastener typically requires alignment of the peaks of the external threa...

AI Technical Summary

Problems solved by technology

[0010] Third, the relative helix angles of the peaks at the crests of the inner and outer lead threads can lead to mistightening failures

As the lead threads grow in height, these lead threads tend to become embedded in the grooves at the tips of the internal female lead threads, which leads to mis-tightening

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