Claims
- 1. A method of manufacturing an elongated braided structural member having high mechanical strength, including the steps of providing at least three primary elongated cores, parallel and spaced from one another, helically winding a plurality of threads around said cores with at least two threads being wound around any pair of primary cores, providing shaping means and putting the cores and the threads wound around them in contact with said shaping means to shape the member with a predetermined openwork shape, and providing cores and/or threads embedded in a resin and molding the resin for shaping the member.
- 2. A method according to claim 1, wherein at least two threads are wound along helices of opposite winding directions around each pair of cores.
- 3. A method according to claim 2, wherein two threads cross each other on one side of the pair of cores and then on the other side, the thread which lies on the inner side of the other thread at one crossing lying on the outer side thereof at the next crossing.
- 4. A method according to claim 1, wherein at least two threads are wound along helices of the same winding direction around each pair of cores, one of said threads passing on one side of the pair of cores when travelling from a first core of the pair to the other, while the other thread passes on the opposite side of the pair of cores when travelling from said other core to the other core.
- 5. A method according to claim 4, wherein four threads are wound around each pair of cores, two of which are wound in one winding direction and the other two in the opposite winding direction.
- 6. A method according to claim 5, wherein twenty-four threads are wound around four primary cores, four threads being wound around each of the six pairs formed by the four cores.
- 7. A method according to claim 1, including the further steps of providing additional cores between two primary cores and surrounding said additional cores, together with the two primary cores, with the threads wound around the latter.
- 8. A method according to claim 1, including the step of disposing successive shaping means for successive lengths of the structural member being manufactured which correspond each to the half pitch of winding of the threads.
- 9. A method according to claim 1, wherein the resin is a thermoset in a pasty state, and including the step of heating said resin during molding for curing it.
- 10. A method according to claim 1, wherein each core and/or each thread comprises a plurality of parallel filaments.
- 11. An elongated braided structural member having high mechanical strength, comprising at least three primary elongated cores which are parallel and spaced from one another, and a plurality of threads wound helically around said cores, with each thread being wound helically around a pair of primary cores and each pair of primary cores having at least two threads wound around it, the member having parallel longitudinal uprights containing the cores and rungs extending between the upright and in which at least some of the threads pass.
- 12. A structural member according to claim 11, wherein the threads meet the primary cores at nodes lying substantially in transverse node planes uniformly distributed along the lengths of the member.
- 13. A structural member according to claim 12, wherein each of the threads meets alternatively the two corresponding primary cores in successive node planes.
- 14. A structural member according to claim 11, wherein at least two threads are wound along helices of opposite winding directions around each pair of primary cores.
- 15. A structural member according to claim 14, wherein two threads cross each other on one side of the pair of cores and then on the other side, the thread which lies on the inner side of the other thread at one crossing lying on the outer side thereof at the next crossing.
- 16. A structural member according to claim 11, wherein at least two threads are wound along helices of the same winding direction around each pair of cores, one of said threads passing on one side of the pair of cores when travelling from a first core of the pair to the other, while the other thread passes on the opposite side of the pair of cores when travelling from said other core to the other core.
- 17. A structural member according to claim 16, wherein four threads are wound around each pair of cores, two of which are wound in one winding direction and the other two in the opposite winding direction.
- 18. A structural member according to claim 17, wherein twenty-four threads are wound around four primary cores, four threads being wound around each of the six pairs formed by the four cores.
- 19. A structural member according to claim 18, wherein, as viewed in transverse section, the primary cores are disposed at the apexes of a convex quadrilateral, the threads extending along the four sides and the two diagonals of said quadrilateral.
- 20. A structural member according to claim 19, wherein the quadrilateral is a rectangle.
- 21. A structural member according to claim 19, wherein the rungs meet the uprights at nodes lying substantially in node planes uniformly distributed along the length of the member.
- 22. A structural member according to claim 21, wherein the rungs extend obliquely with respect to the length of the member.
- 23. A structural member according to claim 22, wherein twelve rungs each containing two thread extend between two successive node planes and form six pairs of rungs extending respectively along the four sides and the two diagonals of the quadrilateral, the two rungs of each pair crossing each other in the manner of the letter X.
- 24. A structural member according to claim 23, comprising four uprights each containing one primary core.
- 25. A structural member according to claim 23, comprising two uprights each containing two primary cores and at least one additional core disposed intermediate said two primary cores.
- 26. A structural member according to claim 21, comprising two uprights each containing two primary cores and wherein a rund extends along each node plane, all of the threads wound around one core of one upright and one core of the other uprights passing in said rung.
- 27. A structural member according to claim 26 having two oblique struts connected to a rung, each of said struts having two ends one of which is joined to the rung and the opposite one is joined to a respective one of the uprights.
- 28. A structural member according to claim 27, wherein eight threads pass from the first upright to the second upright between a first node plane and a second node plane next to the first one follow successively the rung extending along the first node plane, then the second strut and finally the second upright between said opposite end and the seocnd node plane.
- 29. A structural member according to claim 11, wherein voids are present inside the cores and the threads and between them in the upright and rungs, and said voids are filled with a resin.
- 30. A structural member according to claim 11, wherein each core and/or each thread comprises a plurality of parallel filaments.
- 31. A structural member according to claim 11, wherein additional elongated cores are provides between two primary cores and are surrounded, together with the latter, by the threads wound around time.
- 32. An elongated braided structural member having high mechanical strength, comprising four primary elongated cores which are parallel, spaced from one another and disposed at the apexes of a convex quadrilateral as viewed in transverse section, and six groups of four thread wound helically respectively around the six pairs of primary cores corresponding to the four sides and the two diagonals of the quadrilateral, two threads of a group being wound in one winding direction and the other two in the opposite winding direction, and one of the two threads which are wound in a same direction around a pair of cores passing on one side thereof when travelling from a first core of the pair to the other, while the other thread passes on the opposite side of the pair of cores when travelling from said other core to said first core, the member having parallel longitudinal uprights containing the cores and rungs extending between the uprights and in which at least some of the threads pass.
Priority Claims (1)
Number |
Date |
Country |
Kind |
84 04478 |
May 1984 |
FRX |
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Parent Case Info
This is a continuation-in-part of copending application Ser. No. 912,638 filed on Sept. 26, 1986, now abandoned, which was a divisional application of application Ser. No. 713,667 filed Mar. 19, 1985 now U.S. Pat. No. 4,614,147 issued Sept. 30, 1986.
US Referenced Citations (14)
Divisions (1)
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Number |
Date |
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Parent |
713667 |
Mar 1985 |
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Continuation in Parts (1)
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Number |
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912638 |
Sep 1986 |
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