US 12,540,638 B2Granted

Blind type removable fixing device, assembly comprising at least one such fixing device and method of dismantling such a fixing device

AssigneesAirbus Operations GmbH, Ateliers de la Haute Garonne ets Auriol et Cie, S.A.

InventorsJean-Noël Laurent, Julien Bigot, Adrien Fouladoux, Perig Le Henaff, Arnaud Maurice, Bertrand Jehenne, Lucas Gutierrez, François Meric

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Abstract

A fastening device for keeping at least first and second parts assembled, the fastening device comprising a tubular body passing through the first and second parts, an expansion nut and a screw that is seated in the tubular body and cooperates with the expansion nut. To facilitate the removal of the fastening device, the screw has at least one shape, such as a recess positioned on the transverse face thereof, to prevent it from rotating using a first tool, and the expansion nut has at least one shape, such as a flat, to unscrew it using a second tool. Also an assembly comprising at least one such assembly device as well as a removal method.

Claims13

Dependent claims

A fastening device for keeping at least first and second parts assembled, each of which has a through-hole and a bearing surface into which the through-hole opens, said fastening device comprising:

a tubular body;
an expansion nut;
and a screw,
the tubular body extending between a first end and a second end and configured to be seated in the through-holes of the first and second parts, the first end of the tubular body cooperating with the expansion nut, the second end of the tubular body having a head configured to bear against the bearing surface of the first part,
the expansion nut extending between a first end and a second end, having at least one threaded section and an axis of revolution, the expansion nut configured to expand to form a bulb when subjected to a compressive force between the first and second ends thereof,
the screw having a shank extending between a first end and a second end, an axis of revolution, and an end face at the first end of the shank, the shank comprising a threaded section which cooperates with the threaded section of the expansion nut, the second end of the shank having an enlarged shape bearing against the tubular body,
wherein the screw has at least one shape, on a transverse face of the shank, configured to cooperate with a first tool to prevent the screw from rotating about the axis of revolution thereof with respect to the first tool,
wherein the expansion nut has at least one shape designed to cooperate with a second tool to prevent the expansion nut from rotating about the axis of revolution thereof with respect to the second tool,
wherein the expansion nut further comprises a lateral face connecting the first and second ends of the expansion nut, and at least one flat positioned on the lateral face, and
wherein the lateral face comprises a plurality of flats regularly distributed about the axis of revolution of the expansion nut.

7 more elements

A fastening device for keeping at least first and second parts assembled, each of which has a through-hole and a bearing surface into which the through-hole opens, said fastening device comprising:

a tubular body;
an expansion nut;
and a screw,
the tubular body extending between a first end and a second end and configured to be seated in the through-holes of the first and second parts, the first end of the tubular body cooperating with the expansion nut, the second end of the tubular body having a head configured to bear against the bearing surface of the first part,
the expansion nut extending between a first end and a second end, having at least one threaded section and an axis of revolution, the expansion nut configured to expand to form a bulb when subjected to a compressive force between the first and second ends thereof,
the screw having a shank extending between a first end and a second end, an axis of revolution, and an end face at the first end of the shank, the shank comprising a threaded section which cooperates with the threaded section of the expansion nut, the second end of the shank having an enlarged shape bearing against the tubular body,
wherein the screw has at least one shape, on a transverse face of the shank, configured to cooperate with a first tool to prevent the screw from rotating about the axis of revolution thereof with respect to the first tool,
wherein the expansion nut has at least one shape designed to cooperate with a second tool to prevent the expansion nut from rotating about the axis of revolution thereof with respect to the second tool,
wherein the expansion nut further comprises a lateral face connecting the first and second ends of the expansion nut, and at least one flat positioned on the lateral face, and
wherein each flat is positioned closer to the first end of the expansion nut than to the second end of the expansion nut.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/916,784Filed 16 Oct 2024
Priority: FR FR231126118 Oct 2023
Published: US 2025/0129812 A124 Apr 2025
Granted: 3 Feb 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16B 5/04
Joining sheets or plates , e.g. panels, to one another or to strips or bars parallel to them: by means of riveting
F16B 19/1072
Fastened by a pull - mandrel or the like: the pull-mandrel or the like comprising a thread and being rotated with respect to the rivet, thereby…
F16B 19/1054
Fastened by a pull - mandrel or the like: the pull-mandrel or the like being frangible
F16B 19/1063
Fastened by a pull - mandrel or the like: with a sleeve or collar sliding over the hollow rivet body during the pulling operation