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A sail
EP0224729A1
European Patent Office
- Other languages
German French - Inventor
Terry L. Cronburg John C. Sparkman, Jr. - Current Assignee
- Bainbridge Aquabatten Inc
Description
translated from
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[0001] A very significant consideration in sail making is to so fabricate the sail that it will absorb maximum stress with minimum distortion. This is generally done by cutting the fabric into panels so that the yarns in the fabric run parallel to the stress lines in the sail. Near the corners of the sail, the stress lines generally run radially outward from the corners. It is, accordingly, the purpose of this invention to so construct a sail fabric that it has yarns which run radially outward and so approximate the stress pattern at the corner of the sail. -
[0002] As herein illustrated, the invention resides in a sail fabric in which are incorporated warp yarns which radiate from a central apex outward. The sailcloth may be comprised of warp yarns adhesively bonded to one side of a dimensionally stable sheet of plastic or between two sheets of dimensionally stable sheets of plastic or between a sheet of dimensionally stable plastic and a woven fabric or combined with weft yarns and bonded thereto at their crossings. -
[0003] The invention will now be described in greater detail with reference to the accompanying drawings, wherein: - FIG. 1 is a fragmentary plan view of a fabricated material wherein waro yarns are disposed in a radiating array on a film substrate and adhered thereto;
- FIG. 1A is a fragmentary section of the warp yarns disposed between two films;
- FIG. 1B is a fragmentary section of the warp yarns disposed between a film and a woven fabric; ;
- FIG. 2 is a plan view of a fabricated panel wherein the warp yarns are disposed in a radiating array on a woven fabric and adhered thereto;
- FIG. 3 is a plan view of a fabricated panel wherein the warp yarns are disposed in a radiating array in conjunction with a substrate of weft yarns and adhesively secured thereto at their crossing;
- FIG. 4 is a plan view depicting how this fabric is used to form the corners of a sail to provide for efficient use of the warp yarns with regard to the stresses concentrating in the corners of the sail;
- FIG. 5 diagrammatically illustrates in plan view the formation of successive panels; and
- FIG. 6 diagrammatically illustrates structure for disposing the warp yarns in radiating arrays.
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[0004] Referring to the drawings, FIG. 4, there is shown a sail of generally triangular configuration, the threecorners triangular panels 18 structured according to this invention with radiatingwarp yarns 20. At thehead 16 of the sail, there are threepanels 22. At thetack corner 14, there are fourpanels 24 and at theclew corner 12, there are fourpanels 26. Thepanels 18 are sewn together side-by-side along their adjacent edges. Thebody 28 of the sail is comprised ofpanels 30 of conventionally woven fabric wherein thewarp yarns 32 are parallel. As thus fabricated, theradiating warp yarns 20 in the panels comprising the corners of the sail carry the tensile load from the body of the sail to the corners thereof, thereby reducing and controlling the stretch and distortion of the sail and the sail camber. As illustrated, there are three triangular panels at the peak of the sail and four in each corner at the foot of the sail. It is to be understood, however, that there may be a lesser or greater number of panels at the head and foot of the sail. -
[0005] In accordance with the invention as herein illustrated, thewarp yarns 20 in the aforesaid truncated triangular panels are arranged in arrays in which the yarns radiate, that is, diverge with resoect to each other in a direction toward the base of the panel. The triangular panels at the head and foot of the sail are structured by laying thewarp yarns 20 in radiating arrays relative to each other as shown in FIG. 1 and securing them to a substrate P. The substrate P may be comprised of a sheet of plastic. Thewarn yarns 20 are adhesively secured to the sheet of plastic. Alternatively, the radiating arrays of waro yarns 20may be interposed between two sheets of plastic as shown in FIG. 1A or between a sheet of plastic and a woven fabric F as shown in FIG. 1B. FIG. 2 illustrates incorporating the radiatingwarp yarns 22 in a conventionally woven fabric F comprised ofwarp yarns 20 and weft orfilling yarns 34. FIG. 3 illustrates a fabric wherein theradiating warp yarns 20 are combined withweft yarns 36 and adhesively secured at their crossings. -
[0006] The warp yarns comprising the arrays of radiating lengths of yarn are disposed in radiating relation to each other and bonded to a substrate or incorporated in a woven fabric by employing awarp yarn guider 38, FIG. 6, with variable spacing. The composite structure is then cut and trimmed to appropriate length and configuration, FIG. 5, according to location in the sail structure. -
[0007] The yarns may be natural or synthetic and the sheet . material is desirably a dimensionally stable plastic, for example, dacron.