Threaded fastening element

Patent metadata

Field	Value
Publication number	US-2016201711-A1
Application number	US-201414913360-A
Country	US
Kind code	A1
Filing date	Sep 1, 2014
Priority date	Aug 30, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

This threaded fastening element ( 2 ) comprising a threading ( 14 ) extending along a central axis (A), the threading ( 14 ) having at least one screw thread having an apical angle decreasing gradually, continuously and monotonously, between a first apical angle (α 1 ) and a second apical angle (α 2 ) strictly smaller than the first apical angle. The threaded fastening element is a screw or a nut.

First claim

1 . A threaded fastening element comprising a threading extending along a central axis, the threading having at least one screw thread, wherein said screw thread has an apical angle decreasing gradually, continuously and monotonously, between a first apical angle and a second apical angle strictly smaller than the first apical angle.

2 . The threaded fastening element according to claim 1 , wherein the decrease in the apical angle occurs with a constant pitch between the turns of the screw thread.

3 . The threaded fastening element according to claim 1 , wherein the threading comprises at least one variation segment over which the decrease in the apical angle occurs, and at least one other segment over which the screw thread has a constant apical angle.

4 . The threaded fastening element according to claim 3 , wherein the threading comprises a first segment extending from the variation segment and over which the screw thread has a constant apical angle equal to the first apical angle.

5 . The threaded fastening element according to claim 4 , wherein the first segment has a constant diameter or a diameter increasing gradually moving away from the variation segment.

6 . The threaded fastening element according to claim 4 , wherein the screw thread has a constant pitch over the first segment.

7 . The threaded fastening element according to claim 3 , wherein the threading comprises a second segment extending from the variation segment and over which the screw thread has a constant apical angle equal to the second apical angle.

8 . The threaded element according to claim 7 , wherein the screw thread has a constant pitch over the second segment.

9 . The threaded fastening element according to claim 7 , wherein the diameter of the second segment decreases gradually moving away from the variation segment.

10 . The threaded fastening element according to claim 3 , wherein the variation segment is an end segment of the threading.

11 . The threaded fastening element according to claim 1 , wherein the apical angle decreases gradually, continuously and monotonously, between the first apical angle and the second apical angle over the entire length of the threading.

12 . The threaded fastening element according to claim 1 , the threaded fastening element being a screw and comprises a threaded shank, the threading being an outer threading formed on the threaded shank.

13 . The threaded fastening element according to claim 12 , wherein the apical angle of the threading decreases from a first end of the shank to which a screw head is connected toward a second end of the shank that is free.

14 . The threaded fastening element according to claim 12 , wherein the shank has a free end that tappers while being truncated.

15 . The threaded fastening element according to claim 12 , wherein the screw is self-forming or self-tapping.

16 . The threaded fastening according to claim 1 , the threaded fastening element being a nut, the threading being an inner threading formed inside the nut.

17 . The threaded fastening element according to claim 1 , wherein the first apical angle is equal to 60°.

18 . The threaded fastening element according to claim 1 , wherein the threading is triangular.

19 . The threaded fastening element according to claim 1 , wherein the decrease in the apical angle is done over several turns.

20 . A threaded fastening element comprising:
a shank that extends along a central axis from a first end to a second end; and a screw head fixed to the first end of the shank; wherein the shank includes an outer surface comprising a screw thread that extends along the central axis, and wherein the screw thread has an apical angle that decreases continuously over a plurality of turns of the screw thread in a direction toward the second end of the shank between a first apical angle and a second apical angle that is smaller than the first apical angle.

Assignees

• Faurecia Interieur Ind

Inventors

• Lard Frédéric

Classifications

• F16B25/0047 Primary

  the ridge being characterised by its cross-section in the plane of the shaft axis · CPC title

• F16B37/002 Primary

  cutting threads during screwing; removing paint or dirt layers covering threaded shanks · CPC title

• F16B25/0057

  the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections · CPC title

• F16B37/00

  Nuts or like thread-engaging members {(specially shaped for rotations by a tool F16B23/00)} · CPC title

• F16B25/0021

  the material being metal, e.g. sheet-metal or aluminium (F16B25/0031 takes precedence) · CPC title