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US-12624720-B2 - Enhanced flange nut

US12624720B2US 12624720 B2US12624720 B2US 12624720B2US-12624720-B2

Abstract

A nut allowing selective removal of nut material in very specific areas through the use of unusual curvatures and relationships, thereby providing enhanced durability, toughness, resilience to shock, and ability to accept elastic strain, while providing improved stress distribution, increased strength, and resistance to nut dilation. Features of the nut flange and nut transition area, specifically unique combination of radii of curvature, and the placement the curved surfaces, between the planar surfaces of tool engagement surfaces and the flange seat provide enhanced performance.

Inventors

  • Raymond Disantis

Assignees

  • Sky Climber Fasteners LLC

Dates

Publication Date
20260512
Application Date
20230424

Claims (20)

  1. 1 . A nut, comprising: a nut proximal end, a nut distal end, and a nut length between the nut proximal end and the nut distal end; a nut bore extending into the nut from the nut distal end and defining the bore longitudinal axis, with the nut bore having a nut bore proximal end, a nut bore distal end, a nut bore length, defined as the distance between the nut bore proximal end and the nut bore distal end, and a nut bore width; a nut bore thread located within at least a portion of the nut bore and having a NBT crest, a NBT root, and a NBT root wall thickness; a nut tool engagement area having a NTE length, measured parallel to the bore longitudinal axis, that varies from a NTE maximum length to a NTE minimum length, a NTE maximum width, a NTE minimum width, and a plurality of NTE planar surfaces; a nut flange having: a nut flange proximal end at the intersection with the NTE planar surface, a nut flange distal end, a nut flange length between the nut flange proximal end and the nut flange distal end, and a nut flange width; a nut flange seat having a NFS proximal end, a NFS distal end, a NFS length between the NFS proximal end and the NFS distal end, and a NFS width; a nut transition area having a transition length that varies from a maximum transition length to a minimum transition length, wherein the maximum transition length is 25-125% greater than the minimum transition length, and the minimum transition length is at least 7.5% of the nut length; and wherein within a first plane containing the bore longitudinal axis and the location of the maximum transition length, (a) the NBT root wall thickness increases from a first NBT root wall thickness in the nut tool engagement area to a second NBT root wall thickness at a midpoint of the maximum transition length, and the second NBT root wall thickness is no more than 3.0 times the first NBT root wall thickness, and (b) a transition surface of the nut transition area between the nut tool engagement area and the second NBT root wall thickness is concave outward; and wherein a controlled curvature region exists within the nut transition area and is located between a CCR sinistral edge plane and a CCR dextral edge plane, wherein: the CCR sinistral edge plane and the CCR dextral edge plane both contain the bore longitudinal axis and intersect at the bore longitudinal axis with a CCR angle between the CCR sinistral edge plane and the CCR dextral edge plane; a plurality of transition planar deviation points upper are in the controlled curvature region and in contact with the nut tool engagement area representing the points at which the controlled curvature region transitions from one of the plurality of NTE planar surfaces; a plurality of transition planar deviation points lower are in the controlled curvature region and in contact with the NFS proximal end representing the points at which the controlled curvature region transitions from a flat surface of the nut flange seat; the plurality of transition planar deviation points upper and the plurality of transition planar deviation points lower define an upper vertical boundary and a lower vertical boundary of the transition surface; a first analysis section exists in the controlled curvature region between the CCR sinistral edge plane and the CCR dextral edge plane, and the first analysis section includes the bore longitudinal axis, wherein within the first analysis section a first upper transition radius of curvature contacting a first transition planar deviation point upper is at least 0.025″; a second analysis section exists in the controlled curvature region between the CCR sinistral edge plane and the CCR dextral edge plane, and the second analysis section includes the bore longitudinal axis and is different than the first analysis section, wherein within the second analysis section a second upper transition radius of curvature contacting a second transition planar deviation point upper is at least 0.025″; and wherein the first upper transition radius of curvature is not equal to the second upper transition radius of curvature, and the CCR angle is 60 degrees or less.
  2. 2 . The nut of claim 1 , wherein the first upper transition radius of curvature is at least 5% greater than the second upper transition radius of curvature.
  3. 3 . The nut of claim 2 , wherein the first upper transition radius of curvature is greater than the NBT root wall thickness within the nut tool engagement area.
  4. 4 . The nut of claim 3 , wherein within the first plane containing the bore longitudinal axis and the location of the maximum transition length, the transition surface of the nut transition area is entirely concave outward from a transition planar deviation point upper to the NFS proximal end.
  5. 5 . The nut of claim 4 , wherein within the first plane containing the bore longitudinal axis and the location of the maximum transition length, a first transition planar deviation point lower is in contact with the NFS proximal end, a first imaginary straight line extends from the first transition planar deviation point upper to the first transition planar deviation point lower, and the entire transition surface is located between the first imaginary straight line and the bore longitudinal axis.
  6. 6 . The nut of claim 5 , wherein a maximum offset distance measured perpendicularly from the first imaginary line to the transition surface is at least 5% of the NBT root wall thickness located within the nut tool engagement area.
  7. 7 . The nut of claim 1 , wherein the second analysis section is at least 7.5 degrees from the first analysis section.
  8. 8 . The nut of claim 7 , wherein the plurality of NTE planar surfaces includes six NTE planar surfaces, the nut has a nut mass of no more than 3 grams, the second NBT root wall thickness is no more than 2.75 times the first NBT root wall thickness, the maximum transition length is 30-115% greater than the minimum transition length, the minimum transition length is at least 10% of the nut length, the first upper transition radius of curvature is no more than 0.200″, and the second upper transition radius of curvature is no more than 0.200″.
  9. 9 . The nut of claim 8 , wherein the second NBT root wall thickness is no more than 2.5 times the first NBT root wall thickness, the maximum transition length is no more than 100% greater than the minimum transition length, the minimum transition length is no more than 40% of the nut length, the nut length is no more than 0.500″, the nut flange width is at least 0.100″, the NTE minimum width is 0.1000-0.7500″, and the maximum transition length is no more than 0.1500″.
  10. 10 . The nut of claim 9 , wherein the nut has a nut density of less than 4.6 g/cc, the second NBT root wall thickness is no more than 2.25 times the first NBT root wall thickness, the maximum transition length is no more than 90% greater than the minimum transition length, the maximum transition length is 20-50% of the nut length, the minimum transition length is no more than 30% of the nut length, the nut length is at least 0.050″, the nut flange width is no more than 0.850″, and the NBT root wall thickness within the nut tool engagement area is 0.0100-0.0600″.
  11. 11 . The nut of claim 1 , further including a nut locking helix located in the nut bore and engaging a portion of the nut bore thread, and having a nut locking helix proximal end, a nut locking helix distal end, a nut locking helix length between the nut locking helix proximal end and the nut locking helix distal end, wherein the nut locking helix length is 50-100% of the nut length, and at least one full rotation of a full coil of the nut locking helix is located within the nut transition area.
  12. 12 . The nut of claim 11 , wherein the nut locking helix length is 60-90% of the nut length.
  13. 13 . The nut of claim 11 , wherein the nut locking helix includes a plurality of regular coils and a helix locking segment having a plurality of nut locking helix locking segment sections, at least two regular coils are located on each side of the helix locking segment, and the nut locking helix locking segment is closer to the nut proximal end than the nut distal end.
  14. 14 . The nut of claim 11 , wherein a Rockwell C hardness of the nut locking helix is greater than a Rockwell C hardness of the nut.
  15. 15 . The nut of claim 14 , wherein the Rockwell C hardness of the nut locking helix is at least 2 units greater than the Rockwell C hardness of the nut, and the Rockwell C hardness of the nut locking helix is no more than 50 RWC.
  16. 16 . The nut of claim 15 , wherein the Rockwell C hardness of the nut locking helix is no more than 13 units greater than the Rockwell C hardness of the nut, the Rockwell C hardness of the nut locking helix is at least 42 RWC, and the Rockwell C hardness of the nut is no more than 42 RWC.
  17. 17 . The nut of claim 14 , wherein a coefficient of thermal expansion of the nut locking helix is at least 1.5×10 −6 /° C. greater than a coefficient of thermal expansion of the nut, the coefficient of thermal expansion of the nut locking helix is no more than 9×10 −6 /° C. greater than the coefficient of thermal expansion of the nut, and a tensile strength of the nut locking helix is 10-60 ksi greater than a tensile strength of the nut.
  18. 18 . The nut of claim 14 , wherein the nut locking helix has an average Ra roughness value of 39-200 μin.
  19. 19 . The nut of claim 11 , wherein the nut has a nut mass and a nut density, and the nut locking helix has an insert mass of 20-75% of the nut mass and a helix density greater than the nut density.
  20. 20 . A nut, comprising: a nut proximal end, a nut distal end, and a nut length between the nut proximal end and the nut distal end; a nut bore extending into the nut from the nut distal end and defining the bore longitudinal axis, with the nut bore having a nut bore proximal end, a nut bore distal end, a nut bore length, defined as the distance between the nut bore proximal end and the nut bore distal end, and a nut bore width; a nut bore thread located within at least a portion of the nut bore and having a NBT crest, a NBT root, and a NBT root wall thickness; a nut tool engagement area having a NTE length, measured parallel to the bore longitudinal axis, that varies from a NTE maximum length to a NTE minimum length, a NTE maximum width, a NTE minimum width, and a plurality of NTE planar surfaces; a nut flange having: a nut flange proximal end at the intersection with the NTE planar surface, a nut flange distal end, a nut flange length between the nut flange proximal end and the nut flange distal end, and a nut flange width; a nut flange seat having a NFS proximal end, a NFS distal end, a NFS length between the NFS proximal end and the NFS distal end, and a NFS width; and a nut transition area having a transition length that varies from a maximum transition length to a minimum transition length, wherein the maximum transition length is 25-125% greater than the minimum transition length, and the minimum transition length is at least 7.5% of the nut length; a nut locking helix located in the nut bore and engaging a portion of the nut bore thread, and having a nut locking helix proximal end, a nut locking helix distal end, a nut locking helix length between the nut locking helix proximal end and the nut locking helix distal end, wherein the nut locking helix length is 50-100% of the nut length, and at least one full rotation of a full coil of the nut locking helix is located within the nut transition area; wherein within a first plane containing the bore longitudinal axis and the location of the maximum transition length, (a) the NBT root wall thickness increases from a first NBT root wall thickness in the nut tool engagement area to a second NBT root wall thickness at a midpoint of the maximum transition length, and the second NBT root wall thickness is no more than 3.0 times the first NBT root wall thickness, and (b) a transition surface of the nut transition area between the nut tool engagement area and the second NBT root wall thickness is concave outward; and wherein a controlled curvature region exists within the nut transition area and is located between a CCR sinistral edge plane and a CCR dextral edge plane, wherein: the CCR sinistral edge plane and the CCR dextral edge plane both contain the bore longitudinal axis and intersect at the bore longitudinal axis with a CCR angle between the CCR sinistral edge plane and the CCR dextral edge plane; a plurality of transition planar deviation points upper are in the controlled curvature region and in contact with the nut tool engagement area representing the points at which the controlled curvature region transitions from one of the plurality of NTE planar surfaces; a plurality of transition planar deviation points lower are in the controlled curvature region and in contact with the NFS proximal end representing the points at which the controlled curvature region transitions from a flat surface of the nut flange seat; the plurality of transition planar deviation points upper and the plurality of transition planar deviation points lower define an upper vertical boundary and a lower vertical boundary of the transition surface; a first analysis section exists in the controlled curvature region between the CCR sinistral edge plane and the CCR dextral edge plane, and the first analysis section includes the bore longitudinal axis, wherein within the first analysis section a first upper transition radius of curvature contacting a first transition planar deviation point upper is at least 0.025″; a second analysis section exists in the controlled curvature region between the CCR sinistral edge plane and the CCR dextral edge plane, at least 7.5 degrees from the first analysis section, and the second analysis section includes the bore longitudinal axis and is different than the first analysis section, wherein within the second analysis section a second upper transition radius of curvature contacting a second transition planar deviation point upper is at least 0.025″; and wherein the first upper transition radius of curvature is not equal to the second upper transition radius of curvature, and the CCR angle is 60 degrees or less.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. provisional patent application Ser. No. 63/363,508, filed on Apr. 25, 2022, all of which is incorporated by reference as if completely written herein. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT Not applicable. TECHNICAL FIELD OF THE INVENTION The present invention relates generally to the field of fasteners. More particularly, the present invention relates to threaded nuts. Specifically, the present invention relates to thin-walled fastener nuts used in the aerospace and other related industries. BACKGROUND OF THE INVENTION Conventional nut design has generally resulted in the addition of material to strengthen nuts and has failed to recognize that sometimes “less is more” when it comes to improving stress distribution. Further, conventional nut design often leads to specialized heat treatment that results in undesirable attributes such as high hardness values that require precise processing methods to eliminate hydrogen embrittlement and reduce the fracture toughness. As will be disclosed, selectively reducing material from a nut transition area, along with key relationships regarding the removal of this material, can actually improve the performance of a nut. SUMMARY OF THE INVENTION A nut allowing selective removal nut material in very specific areas through the use of unusual curvatures and relationships, thereby providing enhanced durability, toughness, resilience to shock, and ability to accept elastic strain, while providing improved stress distribution, increased strength, and resistance to nut dilation. Features of the nut flange and nut transition area, specifically unique combination of radii of curvature, and the placement the curved surfaces, between the planar surfaces of tool engagement surfaces and the flange seat provide enhanced performance. BRIEF DESCRIPTION OF THE DRAWINGS Without limiting the scope of the present invention as claimed below and referring now to the drawings and figures: FIG. 1 is an isometric view of a prior art nut embodiment; FIG. 2 is an isometric view of a nut embodiment having an enhanced flange; FIG. 3 is another isometric view of a prior art nut embodiment; FIG. 4 is another isometric view of a nut embodiment having an enhanced flange; FIG. 5A is a cross-section isometric view of a prior art nut embodiment; FIG. 5B is another cross-section isometric view of a prior art nut embodiment; FIG. 6 is a cross-section isometric view of a nut embodiment having an enhanced flange; FIG. 7 is another cross-section isometric view of a nut embodiment having an enhanced flange; FIG. 8 is a top plan view of a nut embodiment having an enhanced flange; FIG. 9 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 9-9 in FIG. 8; FIG. 10 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 10-10 in FIG. 8; FIG. 11 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 11-11 in FIG. 8; FIG. 12 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 12-12 in FIG. 8; FIG. 13 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 13-13 in FIG. 8; FIG. 14 is a top plan view of a prior art nut embodiment; FIG. 15 is a cross-section view of a prior art nut embodiment taken along section line 15-15 in FIG. 14; FIG. 16 is a cross-section view of a prior art nut embodiment taken along section line 16-16 in FIG. 14; FIG. 17 is a cross-section view of a prior art nut embodiment taken along section line 17-17 in FIG. 14; FIG. 18 is a cross-section view of a prior art nut embodiment taken along section line 18-18 in FIG. 14; FIG. 19 is a cross-section view of a prior art nut embodiment taken along section line 19-19 in FIG. 14; FIG. 20 is another top plan view of a nut embodiment having an enhanced flange; FIG. 21 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 21-21 in FIG. 20; FIG. 22 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 22-22 in FIG. 20; FIG. 23 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 23-23 in FIG. 20; FIG. 24 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 24-24 in FIG. 20; FIG. 25 is a cross-section view of a nut embodiment having an enhanced flange taken along section line 25-25 in FIG. 20; FIG. 26 is another top plan view of a prior art nut embodiment; FIG. 27 is a cross-section view of a prior art nut embodiment taken along section line 27-27 in FIG. 26; FIG. 28 is a cross-section view of a prior art nut embodiment taken along section line 28-28 in FIG. 26; FIG. 29 is a cross-section view of a prior art nut embodiment taken along section line 29-29 in FIG. 26; FIG. 30 is a cross-section