Fastener installation in composite panels with fastener insert

Patent metadata

Field	Value
Publication number	US-9850927-B2
Application number	US-201514817980-A
Country	US
Kind code	B2
Filing date	Aug 4, 2015
Priority date	Aug 4, 2015
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

Systems and methods provide for the installation of fasteners in a composite panel with a fastener insert. A fastener insert for a composite panel includes a body and a at least three arms extending from the body. The body has a top face and a central hub extending rearward from the top face. The top face has an outer dimension between opposing edges. The arms extend from the central hub on a rear side of the body. In a retracted configuration, the arms are folded inward toward the central hub so that the arms do not extend beyond the outer dimension of the top face. In an extended configuration, the arms extend outward from the central hub beyond the outer dimension of the top face.

First claim

What is claimed is:

1. A fastener insert for a composite panel, comprising:
a body comprising a top face and a central hub extending rearward from a central portion of the top face, the top face having an outer dimension between opposing edges and the central hub comprising a receiving mechanism configured to receive a fastener through the top face of the body; and
a plurality of arms extending from the central hub on a rear side of the body, the plurality of arms being configured to move, in response to an external force, to a retracted configuration, in which the plurality of arms are folded inward toward the central hub such that the plurality of arms do not extend beyond the outer dimension of the top face, and to move, when the external force is removed, to an extended configuration, in which the plurality of arms are extended outward from the central hub beyond the outer dimension of the top face, wherein each arm is biased toward the extended configuration, wherein each of the plurality of arms comprises a retraction mechanism configured to allow the arm to fold inward to the retracted configuration, wherein the retraction mechanism comprises a notch positioned at a pivot point on one side of the arm such that, when the external force is applied to an outer portion of the arm, the arm folds toward the central hub around the notch at the pivot point, and wherein a material of the arm biases the arm to the extended configuration, such that the arm returns to the extended configuration upon removal of the external force.

2. The fastener insert of claim 1 , wherein the top face is circular, wherein the outer dimension of the top face is a diameter, and wherein the central hub is cylindrical.

3. The fastener insert of claim 1 , wherein the receiving mechanism comprises a threaded recess configured to receive the fastener.

4. The fastener insert of claim 1 , wherein the plurality of arms comprises at least three arms.

5. The fastener insert of claim 1 , wherein the top face comprises a thickness approximately equivalent to a thickness of a top sheet of the composite panel, and wherein the central hub extends a distance from the top face approximately equivalent to a thickness of a core of the composite panel such that a bottom surface of the central hub is proximate to a bottom sheet of the composite panel.

6. The fastener insert of claim 5 , wherein a top sheet contact surface of each of the plurality of arms is proximate to a bottom surface of the top face of the body while in the retracted configuration and proximate to a bottom surface of the top sheet of the composite panel while in the extended configuration and while installed within the composite panel.

7. The fastener insert of claim 1 , wherein the plurality of arms is integrally formed with the body.

8. A method for a fastener within a composite panel, the method comprising:
applying an external force to a plurality of arms of a fastener insert in an inward direction around an axis extending from front to rear through a central hub of the fastener insert to move the arms from an extended configuration, toward which the arms are biased, to a retracted configuration, while installing the fastener insert into an aperture in the composite panel, wherein applying the external force to the plurality of arms of the fastener insert in the inward direction around the axis comprises rotating each arm around a retraction mechanism of the arm configured to allow the arm to fold inward to the retracted configuration, and wherein rotating each arm around the retraction mechanism of the arm comprises rotating the fastener insert while advancing the fastener insert within an installation tool such that the plurality of arms contact an upper portion of the installation tool having a converging diameter and rotate inward in response to rotation and the converging diameter of the upper portion;
positioning the fastener insert within the aperture until a top face of the fastener insert is substantially flush with a top sheet of the composite panel;
releasing the external force to extend the plurality of arms of the fastener insert from the retracted configuration, in which the plurality of arms do not extend beyond an outer dimension of the top face, to the extended configuration, in which the plurality of arms are extended outward from the central hub beyond the outer dimension of the top face; and
installing the fastener through the top face of the fastener insert and into the central hub of the fastener insert.

9. The method of claim 8 , wherein rotating each arm around a retraction mechanism of the arm comprises pressing the fastener insert within an installation tool such that the plurality of arms contact an upper portion of the installation tool having a converging diameter and rotate inward in response to pressure against the upper portion having the converging diameter.

10. The method of claim 9 , wherein each arm comprises an angled surface proximate to an end of the arm configured for contacting the upper portion of the installation tool and in response, rotating the arm around the refraction mechanism to the retracted configuration, and wherein rotating inward in response to pressure against the upper portion having the converging diameter comprises rotating inward in response to pressure from the upper portion applied to the angled surface to rotate the arm around the refraction mechanism.

11. The method of claim 8 , wherein the retraction mechanism comprises a notch positioned at a pivot point on one side of the arm such that, when the external force is applied to an outer portion of the arm, the arm rotates toward the central hub around the notch at the pivot point, and wherein a material of the arm biases the arm such that the arm returns to the extended configuration upon removal of the external force.

12. A fastener insert system for a composite panel, the system comprising:
a fastener insert, comprising
a body comprising a top face and a central hub extending rearward from a central portion of the top face, the top face having an outer dimension between opposing edges and the central hub comprising a receiving mechanism configured to receive a fastener through the top face of the body, and
a plurality of arms extending from the central hub on a rear side of the body and comprising a retracted configuration in which the plurality of arms are folded inward toward the central hub such that the plurality of arms do not extend beyond the outer dimension of the top face, and an extended configuration in which the plurality of arms are extended outward from the central hub beyond the outer dimension of the top face; and

an installation tool comprising an upper portion having a converging diameter and a lower portion having a diameter complimentary to a diameter of the top face of the fastener insert such that the lower portion guides the fastener insert into a fastener insert aperture of the composite panel while maintaining the plurality of arms in the retracted configuration.

13. The system of claim 12 , wherein each of the plurality of arms of the fastener insert comprises a refraction mechanism configured to allow the arm to fold inward to the retracted configuration.

14. The system of claim 12 , further comprising: an insert cartridge configured to maintain a plurality of fastener inserts in position for individual installation via the installation tool; and
a fastener insert insertion tool configured to press or rotate each fastener insert from the insert cartridge through the installation tool and into the fastener insert aperture of the composite panel.

15. A m

Assignees

• Boeing Co

Inventors

• Bradley James S
• Lewis Michael S
• Reeves Brad J

Classifications

• F16B13/0808

  by a toggle-mechanism · CPC title

• F16B5/01 Primary

  by means of fastening elements specially adapted for honeycomb panels · CPC title

• F16B19/1081

  fastened by a drive-pin (F16B19/109 takes precedence) · CPC title

• F16B39/284

  Locking by means of elastic deformation ({F16B39/2825, F16B39/36,} F16B39/38 take precedence) · CPC title

• F16B13/141

  Fixing plugs in holes by the use of settable material · CPC title