A JIG LOADING SYSTEM

Abstract: The jig loading system comprises an assembly of straps (10) for attachment to a support member (14) so as to hang downwardly in spaced apart positions. Each strap (10) has a releasable holder (16) thereon for supporting aircraft stringers (18) at spaced apart positions to enable the stringers to be positioned at the jig (24) for loading thereon. The holders (16) are loop-like and are openable and closeable by means of releasable spring clips (28).

Description: A Jig Loading System The invention relates to a jig loading system and is primarily concerned with a system which will enable aircraft wing stringers to be positioned at a jig for loading thereon. Aircraft wing stringers are commonly supplied to an aircraft manufacturer in a long box, typically up to twenty metres in length. After unpacking the individual stringers and removing a polythene wrapping, the stringers are traditionally laid on trestles and are then carried individually by hand from the trestle to a jig used for assembling the wing stringers on to a wing structure. The jig is arranged vertically with the wing span extending horizontally. The jig typically extends up to around 2.5 metres above floor level and each stringer needs to be fitted into a prescribed slot and clamped in position. When all the wing stringers have been fitted into the jig, a wing skin is clamped in position on the jig so as to overlie the stringers in known manner. As will be appreciated, the aforesaid traditional method of handling the stringers is totally manual and necessitates the availability of several operatives to handle the long stringers. Also, because of the extreme length and slender cross section of the stringers they can easily bend and whip when being carried. The stringers are also difficult to handle when being mounted on the higher parts of the jig in view of their size. An object of the present invention is provide a jig loading system which will help reduce the problems outlined above and which will support wing stringers more positively at the jig prior to loading. According to one aspect of the invention there is provided a jig loading system comprising an assembly of elongate members for attachment to a support member so as to hang downwardly in spaced apart positions, each elongate member having a releasable holder thereon, the holders of the assembly being ananged to support an aircraft stringer at spaced apart positions to enable the stringer to be supported at the jig for loading thereon. With a system in accordance with the invention, the stringer can be supported along its length by the holders thereby reducing significantly the likelihood of unwanted bending or whip in the stringer during loading on to the jig. Preferably, the holder of each elongate member is loop-like. In such a case the loop may be openable or closeable to enable the stringer to be positioned therein or released therefrom. In a prefened embodiment, the holder is openable or closeable by means of a releasable spring clip. Preferably, the spring clip can be clipped to a ring or the like to close the holder. The spring clip or the ring is preferably ananged at one end of a length of material which is attached to its elongate member and the ring or spring clip is preferably ananged to provide an anchor which may be mounted on the elongate member to which the length of material is attached. In the prefened embodiment, the releasable spring clip is provided at said one end of the length of material. In such a case, a said ring may form the anchor. The anchor may be mounted on the elongate member at a position adjacent an attachment point for an adjacent length of material which forms a said further holder on the elongate member. In a prefened anangement, each elongate member has a plurality of holders thereon at spaced apart intervals. In such a case, each holder on a said elongate member may overlap an adjacent holder to provide a staggered holder anangement. That particular configuration provides increased flexibility with respect to the spacing of stringers supported by the holders. Normally, the holders on one of the spaced apart elongate members will be substantially aligned with conesponding holders on an adjacent elongate member. Preferably, the elongate members are flexible and may conveniently take the form of straps. The flexibility facilitates transfer of stringers to the jig and also allows compact storage. The moving of the stringers from the trestles to the jig involves repetitive journeys all taking up time and increasing the risk of possible damage. One of the advantages of the present invention is that the jig loading system can be assembled for transport as a package with a stringer in the holders. Where each of the elongate members has a plurality of holders thereon, a plurality of stringers may be positioned in the holders which are assembled as a package. For ease of unpacking, the support member is preferably attachable to the elongate members in the package whereby the assembly of elongate members and stringers can be unpacked by hoisting the support member by suitable means to lift the elongate members and the stringer or stringers thereon into a desired position at the jig. In that way, the stringers can be packed by the stringer manufacturer in such a way that the end user receives the stringers in a form ready for lifting straight up to the jig which is particularly useful from the point of view of jig loading time and ease of handling. If desired, the support member may be attached to the elongate members in the package thereby forming part of the package itself. According to another aspect of the invention there is provided a method of packaging aircraft wing stringers for subsequent loading on to a jig, the method comprising providing a plurality of elongate flexible support members each of which has thereon a plurality of releasable holders, spacing the elongate members apart, positioning a plurality of stringers in said releasable holders so that the stringers lie alongside each other, forming the assembled elongate members and stringers as a package, transporting the package to a position near a jig, lifting the elongate members so as to unpack the assembly and positioning the stringers at the jig for loading thereon. The method may include the use of features set out in any of the consistory clauses relating to the first said aspect of the invention. A jig loading system in accordance with the invention will now be described by way of example with reference to the accompanying drawings in which: Fig 1 is a diagrammatic perspective view of a jig loading system in accordance with the invention with wing stringers in position in holders thereof, Fig 2 is an elevation of part of a jig loading system in accordance with the invention in which holders are formed from lengths of material closeable by spring clips, Fig 3 is an elevation of a staggered anangement of holders, Fig 4 is an edge view of one of the holders in an open position, Fig 5 is a perspective view of two straps and the holders thereon supporting a stringer at a jig, Fig 6 is a diagrammatic view showing the way in which the jig loading system can be folded for transport as a package, Fig 7 shows the way in which the package of Fig 6 can be packed into a carrying box and Fig 8 is a diagrammatic plan view of the box of Fig 7. Looking at Fig 1 , the jig loading system comprises a plurality of elongate members in the form of straps 10 which hang downwardly from rings 12 or other suitable connections attached to a support member in the form of a bar 14. Each strap 10 may be formed from a webbing-like fabric such as nylon and carries a plurality of holders 16 for wing stringers 18. It will be noted that the holders 16 on the straps 10 are substantially aligned with respective holders 16 of neighbouring straps 10 so as to support the stringers 18 at intervals over the major length of each stringer. The support bar 14 can be connected to an overhead crane by means of a chain 20. In that way the support bar 14 can be hoisted so as to position the stringers 18 substantially opposite horizontal rows of recesses 22 in a jig 24 (see Figs 4 and 5). Once in that position, the holders 16 are opened one at a time to enable the stringers 18 to be located in the recesses 22, the remaining holders 16 continuing to support the stringers 18 while that is being done. As will be appreciated, such an anangement provides a means of supporting the stringers 18 at the jig 24 without requiring several workers to do so. Referring to Figs 2 to 5 it will be seen in Fig 2 that each hanging strap 10 carries strips of material 26 which are attached at upper ends as viewed in the drawings to the strap 10 and have spring retaining clips 28 of known kind at their lower ends. Immediately above each strip 26 is an anchor 30 comprising a metal ring 32 held in a loop of material 34 attached to the strap 10. As shown in Fig 3, the straps 10 can be made wide to enable the strips 26 and rings 32 to be staggered to keep strap length to a minimum. One of the holders 16 indicated at A is closed and one holder indicated at B is open. In each of the above cases, the strips 26 and associated rings 32 on one strap 10 are substantially in horizontal alignment with conesponding strips 26 and rings 32 of neighbouring straps 10. In order to form a holder 16, a spring clip 28 is lifted as shown by anow L in Fig 4 and is clipped on to the associated ring 32 as shown in Fig 5. A stringer 18 can be retained in the holder 16 as shown in Figs 5 and 6. From Fig 5 it will be seen that when a stringer 18 is supported by the holders 16, the strap 10 is positioned vertically to align the stringer with a row of recesses 22 in the jig 24, only two of such recesses can be seen in Fig 5. Once the stringer 18 has been aligned with the recesses 22, the holders 16 can be opened in turn by releasing the spring clips 28 from the rings 32 to enable the stringer 18 to be placed in the recesses 22 in the jig 24. Referring now to Figs 6 to 8, the holders 16 on the straps 10 can be loaded with stringers 18 at the factory of a stringer manufacturer and the straps 10 can be folded in concertina manner as shown in Figs 6 and 7. Preferably, the upper ends of the straps 10 will be attached to the support bar 14 at suitable spaced positions. The folded straps 10 with the stringers 18 in situ are then packed in a box 34 which is fitted with a lid 36 for transporting to a wing build section at the factory of an aircraft manufacturer. Once the box has reached its destination, the box 34 is positioned near the jig 24 and the lid 36 is removed. An overhead crane is then used to hoist the support bar 14 and lift the straps 10 into positions next to the jig 24 to align the stringers 18 with the recesses 22 in the jig 24 ready for loading. The spacing of the strips 26 on the straps 10 is designed to match the spacing requirements of the stringers 18 for the particular jig 24 concerned. The invention significantly reduces jig loading time and the risks and difficulties involved in having to carry the stringers 18 manually from an unpacking point to a loading position at the jig 24.

Claims: Claims 1. A jig loading system comprising an assembly of elongate members for attachment to a support member so as to hang downwardly in spaced apart positions, each elongate member having a releasable holder thereon, the holders of the assembly being ananged to support an aircraft stringer at spaced apart positions to enable the stringer to be supported at the jig for loading thereon. 2. A jig loading system according to claim 1 in which the holder of each elongate member is loop-like. 3. A jig loading system according to claim 1 or 2 in which the holder can be opened or closed to enable the stringer to be positioned therein or released therefrom. 4. A jig loading system according to claim 3 in which the holder is openable or closeable by means of a releasable spring clip. 5. A jig loading system according to claim 4 in which the spring clip can be clipped to a ring or the like to close the holder. 6. A jig loading system according to claim 4 or 5 in which the spring clip or the ring is ananged at one end of a strip of material which is attached to its elongate member and the ring or spring clip is ananged to provide an anchor. 7. A jig loading system according to claim 6 in which the anchor is mounted on the elongate member to which the strip of material is attached. 8. A jig loading system according to claim 6 or 7 in which the anchor is mounted on the elongate member at a position adjacent an attachment point for an adjacent strip of material which forms a further holder on the elongate member. 9. A jig loading system according to any preceding claim in which each elongate member has a plurality of holders thereon at spaced apart intervals. 10. A jig loading system according to claim 9 in which each holder on a said elongate member overlaps an adjacent holder to provide a staggered holder anangement. 11. A jig loading system according to claim 9 or 10 in which the holders on one of the spaced apart elongate members are substantially aligned with the conesponding holders on an adjacent elongate member. 12. A jig loading system according to any preceding claim in which the elongate members are flexible 13. A jig loading system according to any preceding claim in which the elongate members are in the form of straps. 14. A jig loading system according to any preceding claim assembled for transport as a package with at least one stringer in the holders. 15. A jig loading system according to claim 14 in which the support member is attachable to the elongate members in the package whereby the assembly of elongate members and at least one stringer can be unpacked by lifting the support member by suitable means into position at the jig. 16 A jig loading system according to claim 15 in which the support member forms part of the package with the elongate members being attached to the support member in the package. 17 A method of packaging aircraft stringers for subsequent assembly at a jig, the method comprising providing a plurality of elongate flexible members each of which has thereon a plurality of releasable holders, spacing the elongate members apart, positioning a plurality of stringers in said releasable holders so that the stringers lie alongside each other, forming the assembled elongate members and stringers as a package, transporting the package to a jig, and lifting the elongate members by suitable means so as to unpack the assembly and position the stringers at the jig for loading thereon.

Inventors: MINSHULL ALAN JAMES, MINSHULL, ALAN, JAMES
Applicants: BRITISH AEROSPACE, MINSHULL ALAN JAMES, BRITISH AEROSPACE PUBLIC LIMITED COMPANY, MINSHULL, ALAN, JAMES
Application year: 1999
Main classification: B64F5
IPC codes: B64C3, B64F5, B65G1