Lisi Aerospace

Guy Pailhories

Loïc Meiffre

Olivier Gay

Antoine Villet

Nicolas Naretto

Frederic Bigot

Jérôme Couderc

Loic Meiffre

Christophe Vandaele

Frédéric Bigot

Yoann Douard

Jerome Couderc

A rivet may include The shank () of the pin comprises a first cylindrical portion () and a second cylindrical portion () connected by a shoulder (), the first portion being adjacent to the head and having a first diameter, the second portion being adjacent to the threaded portion and having a second, smaller diameter.

Blind rivet having a shoulder shank and associated installation method

A nut () for assembling elements of a structure comprises a collar () capable of coming into contact with a front face of the structure; a tightening zone having an outer diameter () capable of being inserted into a hole of the structure; a deformation zone adjacent to the tightening zone and capable of forming a bulge against a rear face of the structure, opposite the front face; and a tapped portion () adjacent to the deformation zone. The nut may include grooving () on an outer circumference of at least one part of the deformation zone, a maximum diameter of said grooving () being less than or equal to the outer diameter () of the tightening zone.

Grooved nut for blind fastening, rivet and assembly comprising such a nut

The invention concerns a fastener used to attach structural components that have aligned perforations with a nominal diameter (D), where the fastener comprises a minimum grip plane (Gmin) and a maximum grip plane (Gmax), and The deformable area (B) extends over a length (L) greater than a minimum length (Lmin) and less than a maximum length (Lmax), such as:min=/2+2+(max&#x2212;min);max=(/0.092) In particular, the invention applies to the assembly of aircraft structures.

Attachment fitted on a single side

A fastening bolt has a threaded screw () with a terminal portion () whose diameter () is less than that of the threaded portion, and an end surface () of said terminal portion has a transverse opening groove (). The fastening bolt also has a nut () comprising a threaded body () and an unthreaded crown () drilled with at least two holes () diametrically opposite to one another and a rod (), able to fit in the groove of the screw and in the two lateral holes of the nut to lock the bolt. The body of the nut comprises a driving portion (), as well as a cylindrical portion () less thick than the driving portion, and the cylindrical portion () of the nut has an elliptical deformation that was previously a circular shape.

Attachment bolt for positive locking

A rivet for blind fastening may include a screw with a handling element, a break groove, a head separated from the handling element by the break groove, and a threaded part. The rivet may also include a sleeve with a collar and a tubular shank having an internal thread intended to come into engagement with the threaded part of the screw. The handling element includes a first handling portion able to guide introduction of the rivet in a setting tool, and a second handling portion able to transmit a torque, the two handling portions being separated by a blocking portion able to limit an axial movement of the rivet in a setting tool. A setting nose may be used for installing such a rivet, and the rivet, setting nose and a setting method can be used in the assembly of aircraft structures.

Growing community of inventors

Villefranche de Rouergue, France

Guy Pailhories