WO2007146108A2 - Élément de fixation et procédé de fixation de matériel à des panneaux d'âme en plastique/alvéolaires renforcés par des fibres - Google Patents

Élément de fixation et procédé de fixation de matériel à des panneaux d'âme en plastique/alvéolaires renforcés par des fibres Download PDF

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Publication number
WO2007146108A2
WO2007146108A2 PCT/US2007/013485 US2007013485W WO2007146108A2 WO 2007146108 A2 WO2007146108 A2 WO 2007146108A2 US 2007013485 W US2007013485 W US 2007013485W WO 2007146108 A2 WO2007146108 A2 WO 2007146108A2
Authority
WO
WIPO (PCT)
Prior art keywords
cap
skin
plug member
top skin
panel
Prior art date
Application number
PCT/US2007/013485
Other languages
English (en)
Other versions
WO2007146108A3 (fr
Inventor
Victor M. Pineiros
Bobby Lamar Waits
Wilhelm Schepergerdes
Original Assignee
Pineiros Victor M
Bobby Lamar Waits
Wilhelm Schepergerdes
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pineiros Victor M, Bobby Lamar Waits, Wilhelm Schepergerdes filed Critical Pineiros Victor M
Publication of WO2007146108A2 publication Critical patent/WO2007146108A2/fr
Publication of WO2007146108A3 publication Critical patent/WO2007146108A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/01—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening elements specially adapted for honeycomb panels

Definitions

  • PATENT APPLICATION TITLE Fastener and Method of Attaching Hardware to Fiber Reinforced Plastic/Honeycomb Core Panels
  • the present invention relates to an apparatus and method for creating hardened attachment points for fiber reinforced plastic (FRP) honeycomb core panels.
  • FRP fiber reinforced plastic
  • honeycomb core panels may comprise a sandwich structure having top skin and a bottom skin with an intermediate honeycomb core.
  • honeycomb sandwich panels are disclosed in United States Patent Nos. 6,267,838 Bl and 6,743,497 B2.
  • Hardened attachment points are often necessary for composite panels typically found on overhead stow bins, galleys or lavatories in commercial aircraft. For example, attaching a hinged access door to an overhead bin made out of composite panel requires such a hardened attachment point for hinges or latching mechanisms.
  • the presently disclosed apparatus and method is not limited to such application but may also be used in aerospace construction where it is necessary to attach hardware to a FRP honeycomb core panel construction.
  • Floating inserts feature a threaded connector component which moves to compensate for misalignment of the corresponding fastener.
  • inserts are potted or mechanically installed in sandwich material, like honeycomb, to allow fabrication of interior secondary structures of the aircraft, such as stow bins, galleys, and lavatories.
  • Floating inserts feature a nut component that can move to compensate for misalignment of the screw.
  • a current practice for providing hardened attachment points is to utilize metallic or non-metallic inserts which are potted in composite panels.
  • the potting compound is typically a two part epoxy type filler material which is soft and pliable in the as-mixed condition, but cures and hardens at room temperature or at elevated temperatures if it is oven cured.
  • debris is removed and the hole is partially filled with potting compound.
  • the insert is then pressed into the partially filled hole and additional potting compound injected into the cavity until potting compound extrudes from the out-gassing holes of the insert.
  • the insert is held in place during the potting and curing cycles by means of an adhesive tab glued to the outer skin of the panel.
  • the potting process is time consuming and unreliable because it depends on the operator's ability to completely fill a cavity invisible from the outside.
  • the curing cycle causes additional problems because it is an exothermic process and generated gases escape from the mixture. In many instances the out-gassing pressures are high enough to push the inserts out of position, causing rejections and rework.
  • the presently disclosed apparatus and method eliminate the need for potting compounds to create hardened attachment points. Instead, the disclosed apparatus and method utilize features in which components of the insert engage the top and bottom fiber reinforced panel skins, resulting in high shear and pull-out values for the panel construction.
  • the disclosed apparatus and method takes advantage of the typical FRP/honeycomb panel construction which has fiber reinforced resin composite top and bottom skins with a honeycomb core sandwiched between the skins. The high mechanical properties of the panels are mostly derived from the strength of the top and bottom skins being structurally spaced by the honeycomb core.
  • the apparatus comprises three basic elements, being the cap member, the plug member, and the connector member which may float laterally to allow for fastener misalignment.
  • the cap member is adhesively attached to the upper surface of the bottom skin of the composite panel.
  • the plug member fits and slides into the cap member.
  • the plug member attaches to the cap member, such as by utilizing various adhesives, such as a pressure activated adhesives.
  • the plug member attaches to the top skin of the composite panel.
  • structural members of the plug member may snap under the top skin of the composite panel. These members may further comprise adhesive which bonds the plug member to the top skin of the panel.
  • the apparatus further comprises a threaded connector member, which may be either male or female and which may float within the apparatus.
  • the threaded connector member is located between the plug member and the cap member and structurally retained while floating within the assembly.
  • the threaded connector member receives and engages a corresponding sleeve nut or screw.
  • the capacity of the threaded connector member to float within the assembly compensates and adjusts for location tolerances or mismatch between the structural elements being joined.
  • Figure 1 shows a perspective view of an embodiment of the components of the apparatus showing internal detail of the cap member.
  • Figure 2 shows a perspective view of an embodiment of the components of the apparatus showing detail of the plug member.
  • Figure 3 shows a perspective view of an embodiment of the components of the apparatus wherein the connector member has male threads.
  • Figure 4 shows a perspective view of an embodiment of the three components of the apparatus in an assembled configuration.
  • Figure 5 shows a sectional view of the embodiment shown in
  • Figure 6 shows a sectional view of an embodiment of the assembled apparatus having internal threads installed within a FRP/honeycomb panel.
  • Figure 7 shows a sectional view of an embodiment of the assembled apparatus having external threads installed within a FRP/honeycomb panel.
  • an embodiment 10 of the apparatus comprises a cap member 12, a plug member .14, and a connector member 16.
  • the materials used for fabrication of these components should be of the type suitable for application in FRP/honeycomb panels utilized in aircraft, such as thermoplastic materials. As shown in the sectional views in Figure 6 and Figure 7, these panels comprise a top skin 18 and a bottom skin 20 in parallel spaced apart facing relation.
  • the panels further comprise a honeycomb core structure 22 bounded between the bottom surface 18 ' of the top skin 18 and the upper surface 20' of the bottom skin 20.
  • top references the side of the panel which is utilized for placement of the hardened attachment point, with other terms used with respect to the "top” as defined.
  • the panel further comprises a blind aperture 24 which penetrates through the top skin 18 and extends through the honeycomb core structure 22 and terminates at the upper surface 20' of the bottom skin 20.
  • a blind aperture 24 which penetrates through the top skin 18 and extends through the honeycomb core structure 22 and terminates at the upper surface 20' of the bottom skin 20.
  • Cap member 12 comprises an abutment end 26 and a receiving end 28, which comprises an opening.
  • the abutment end 26 comprises a first surface 30 which, upon installation of the apparatus into the blind aperture 24 of a panel, abuts the upper surface 20' of the bottom skin 20, as shown in Figure 6 and Figure 7.
  • the first surface 30 comprises an adhesive which bonds the cap member 12 to the upper surface 20' of the bottom skin 20.
  • Suitable adhesives comprise pressure activated adhesives, light activated adhesives, heat activated adhesives and two-part adhesives.
  • Cap member 12 may be a molded component of a cylindrical shape. As shown in Figure 5, abutment end 26 may comprise a rib structure 40 to provide the necessary spacing for a pre-applied or otherwise placed pressure activated adhesive.
  • the receiving end 28 of the cap member 12 is shaped to receive and mate with the plug member 14.
  • the receiving end 28 has an opening which is dimensioned to receive the male portion of the plug member 14, the male portion hereinafter referred to as the cap attachment end 32.
  • the dimensions of the mating portions of cap member 12 and plug member 14 are configured to allow adjustment of the overall length of the assembly to correspond to the thickness of the sandwich panel during the installation process.
  • the end of the plug member 14 opposite from the cap attachment end 32 is referred to herein as the top skin attachment end 34.
  • the plug member 14 may comprise two or more two or more axially extending engagement members 48.
  • the axially extending engagement members 48 may further comprise laterally extending clip member 50.
  • the receiving end 28 of the cap member 12 may comprises an inwardly facing lip member 52 which engages the laterally extending clip member 50 thereby allowing axial movement of the plug member with respect to the cap member but inhibiting withdrawal of the plug member 14 from the cap member once the cap attachment end 32 of the plug member has been placed within the cap member.
  • the top skin attachment end 34 will be generally flush with the top skin 18.
  • the plug member 14 has an axially-aligned opening 36 extending from the cap attachment end 32 to the top skin attachment end 34.
  • the cap attachment end 32 attaches to the cap member 12.
  • the means for attachment may be made mechanically with an interference fit between the cap attachment end 32 and the receiving end 28 of the cap member.
  • the internal surfaces of the cap member 12 may utilize an adhesive such that the cap member 12 and the plug member 14 are solidly joined together when the adhesive cures.
  • Suitable adhesives comprise pressure activated adhesives, light activated adhesives, heat activated adhesives and two-part adhesives.
  • the internal surfaces of the cap member 12 and/or plug member 14 may have air venting slots to prevent hydraulic lock of the adhesive during installation.
  • the plug member 14 may be a molded component of a cylindrical shape with an axially extending concentric cavity 42 within the cylinder which allow deflection of the outside cylinder wall to allow sufficient flexibility for the assembly to pass through the internal diameter of the aperture 24 and then spring back and snap in place to permanently captivate the entire assembly 10 between the top skin 18 and a bottom skin 20 of the sandwich panel.
  • the axially extending cavity 42 is outwardly concentric to axially-aligned opening 36 and is best shown in Figure 5 and Figure 6.
  • the captivation may be improved by utilizing a pre-applied pressure activated adhesive on top skin attachment end 34 which comes in intimate contact with the bottom surface 18' of the top skin 18.
  • the internal portion of the plug member is configured to accommodate and capture a floating threaded connector member 16.
  • plug member 14 may have a first diameter at the cap attachment end 32 and a second diameter at the top skin attachment end.34, such that the plug member has a tapered configuration.
  • the top skin attachment end 34 may comprise a peripheral attachment surface 38 which abuts the bottom surface 18' of the top skin 18 upon installation of the apparatus. Suitable adhesives, such as a pre-applied pressure activated adhesive, may be pre-applied to the peripheral attachment surface 38.
  • the top skin attachment end 34 may further comprise a sleeve member 40 which bounds the peripheral attachment surface 38.
  • the sleeve member 40 may comprise axially extending slots 44 to increase the flexibility of the plug member 14.
  • sleeve member 40 extends through the top skin 18 and may be flush with the exterior surface of the top skin.
  • the threaded connector member 16 is of either male or female configuration depending on the particular embodiment of the invention. As shown in Figure 1 , the threaded connector member 16 may have internal threads 46 for receiving a male fastener. Alternatively, as shown in Figure 3, the threaded connector member 16' may have external threads 46' for receiving a fastener 48 having internal threads (not shown). The connector member 16 is retained within the axially-aligned opening 36 of plug member 14. The connector member 14 has sufficient free lateral movement or "float" necessary to compensate for location tolerances or mismatch of the elements being attached to the invention. As best shown in Figure 2, the connector member 16 may comprise laterally extending ear members 54.
  • the ear members 54 are bounded by the axially extending engagement members 48 which limit rotation of the connector member 14 with respect to the plug member 14.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

Insert d'élément de fixation à utiliser avec des panneaux d'âme alvéolaires en plastique renforcés par des fibres qui élimine la nécessité d'employer un matériau d'enrobement pour retenir l'insert à l'intérieur du panneau. À la place, l'insert utilise des composants structurels qui engagent des enveloppes extérieures de panneau renforcées par des fibres, conférant à la structure des panneaux des valeurs de cisaillement et d'arrachement élevées. L'insert d'élément de fixation comprend un élément de coiffe, un élément de bouchon et un élément de connecteur qui peut flotter latéralement pour tenir compte d'un désalignement de l'élément de fixation. L'élément de coiffe est fixé de façon adhésive à la surface supérieure de l'enveloppe extérieure inférieure du panneau composite. L'élément de bouchon s'agence et coulisse dans l'élément de coiffe. L'élément de bouchon est fixé sur l'élément de coiffe, par exemple en utilisant des adhésifs activés par application de pression. Lors de l'installation, l'élément de bouchon est fixé sur l'enveloppe extérieure du panneau composite. Ces éléments peuvent comprendre un adhésif activé par application de pression pour coller les éléments sur l'enveloppe extérieure du panneau ou les unes aux autres. La configuration de l'élément de bouchon et de l'élément de coiffe peut permettre de régler la hauteur de l'appareil en fonction des variations nécessaires de l'épaisseur totale du panneau typiques dans la fabrication des panneaux alvéolaires/de plastique renforcés par des fibres.
PCT/US2007/013485 2006-06-08 2007-06-07 Élément de fixation et procédé de fixation de matériel à des panneaux d'âme en plastique/alvéolaires renforcés par des fibres WO2007146108A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81192806P 2006-06-08 2006-06-08
US60/811,928 2006-06-08

Publications (2)

Publication Number Publication Date
WO2007146108A2 true WO2007146108A2 (fr) 2007-12-21
WO2007146108A3 WO2007146108A3 (fr) 2008-10-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/013485 WO2007146108A2 (fr) 2006-06-08 2007-06-07 Élément de fixation et procédé de fixation de matériel à des panneaux d'âme en plastique/alvéolaires renforcés par des fibres

Country Status (1)

Country Link
WO (1) WO2007146108A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2221489A1 (fr) * 2009-02-13 2010-08-25 Hettich-Heinze GmbH & Co. KG Procédé d'introduction d'une cheville adhésive dans un panneau de construction léger et dispositif d'exécution du procédé

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179143A (en) * 1960-02-29 1965-04-20 Minnesota Mining & Mfg Adhesive locked fastening devices
US3434261A (en) * 1964-03-30 1969-03-25 Frederick W Rohe Molded-in insert with floating nut

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179143A (en) * 1960-02-29 1965-04-20 Minnesota Mining & Mfg Adhesive locked fastening devices
US3434261A (en) * 1964-03-30 1969-03-25 Frederick W Rohe Molded-in insert with floating nut

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2221489A1 (fr) * 2009-02-13 2010-08-25 Hettich-Heinze GmbH & Co. KG Procédé d'introduction d'une cheville adhésive dans un panneau de construction léger et dispositif d'exécution du procédé

Also Published As

Publication number Publication date
WO2007146108A3 (fr) 2008-10-23

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