Polygonal driving means with inbuilt collar

Patent metadata

Field	Value
Publication number	US-10378574-B2
Application number	US-201816024897-A
Country	US
Kind code	B2
Filing date	Jul 1, 2018
Priority date	Oct 20, 2008
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

It has become apparent that the dimensions of inbuilt-collar driving means of the same nominal size may vary according to the method of manufacture. The dimensions of the collar must therefore be adapted to suit the mode of manufacture, at the expense of its strength or mass. Moreover, the transmissible torque for tightening and loosening operations varies according to a useful wrenching height. In order to have a useful height identical to the height of the shank (7), the idea underlying the invention involves pushing the frustoconical collar (152) of a driving means (151) in towards its center along the extension of the sides of the shank. The inbuilt-collar driving means proposed by the invention is suited to all modes of manufacture, and can be manufactured without adversely affecting the dimensions of the driving means or its installation.

First claim

The invention claimed is:

1. An assembly of a washer and a monolithic nut, wherein the monolithic nut comprises a polygonal shank with lateral sides and an inner wall on the polygonal shank having cylindrical threads along the inner wall of the polygonal shank, the monolithic nut having a frustoconical collar having a spherical lower portion and a bottom surface wherein the threads and the bottom surface are configured such that a threading movement of the nut along a mating threaded surface puts the spherical lower portion into contact with the washer, such that the contact places an axial load on the spherical lower portion of the collar, an upper-most collar surface opposite the bottom surface and a frustoconical curved surface between the bottom surface and the upper-most collar surface, wherein the frustoconical collar comprises a plurality of socket faces hollowed out from and relative to the frustoconical curved surface in an area between the bottom surface and the upper-most collar surface and wherein the socket faces extend to a plane defined by the respective polygonal shank lateral side, each lateral side of the polygonal shank being aligned with a respective hollowed-out socket face, and each lateral side of the polygonal shank terminates at a substantially transverse surface between the lateral side and a respective hollowed-out socket face at the intersection of the upper-most collar surface and the polygonal shank.

2. The assembly of claim 1 wherein the socket faces are planar.

3. The assembly of claim 1 wherein the nut is obtained by forging via a die, machining, casting, sintering or plastic injection molding.

4. The assembly of claim 1 , further comprising fillets fitted between the socket faces of the frustoconical collar and the lateral sides of the polygonal shank.

5. The assembly of claim 1 wherein the nut is made out of titanium alloy, stainless steel, nickel alloy or aluminium alloy.

6. The assembly of claim 1 , wherein the shank is hexagonal or bi-hexagonal.

7. The assembly of claim 6 , wherein the frustoconical curved surface of the frustoconical collar forms an angle of at least forty-five degrees with a circular base of the collar.

8. The assembly of claim 1 , wherein the socket faces are marked or colored.

Assignees

• Lisi Aerospace

Inventors

• Berton Anthony
• Guerin Nicolas

Classifications

• F16B23/0061 Primary

  with grooves, notches or splines on the external peripheral surface designed for tools engaging in radial direction (F16B23/003 takes precedence) · CPC title

• F16B37/00

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

• F16B33/06

  Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure {or fretting (corrosion preventing means F16B33/008; settable coatings for locking threaded members F16B39/225; deformable coatings for locking threaded members F16B39/34)} · CPC title