Rope having a spliced eye, corresponding method of forming an eye and use of the rope
10669670 ยท 2020-06-02
Assignee
Inventors
Cpc classification
D07B7/18
TEXTILES; PAPER
International classification
D07B7/18
TEXTILES; PAPER
Abstract
Rope having an eye. The rope comprises a first rope portion and a second rope portion. The first rope portion and the second rope portion are spliced into each other for forming a spliced connection for obtaining the eye. The first rope portion and the second rope portion are formed from an end portion of the rope.
Claims
1. A rope having an eye, the rope comprising a first rope portion and a second rope portion that are spliced into each other for forming a spliced connection for obtaining the eye, wherein: the first rope portion and the second rope portion are formed from an end portion of the rope; the rope is provided with a jacket that comprises yarns; a first portion of the yarns of the jacket is provided around the first rope portion and a second portion of the yarns of the jacket is provided around the second rope portion; the first rope portion has at least one first strand portion and the second rope portion has at least one second strand portion that is distinct from the at least one first strand portion, and the first portion of the yarns of the jacket is provided individually around each first strand portion of the first rope portion so that a yarn of the first portion of the yarns of the jacket surrounds only one of the first strand portions, and the second portion of the yarns of the jacket is provided individually around each second strand portion of the second rope portion so that a yarn of the second portion of the yarns of the jacket surrounds only one of the second strand portions.
2. The rope according to claim 1, wherein the spliced connection extends along substantially the whole eye.
3. The rope according to claim 1, wherein the first rope portion is approximately equal to the second rope portion.
4. The rope according to claim 1, wherein a thickness and/or cross section of the first rope portion and the second rope portion are approximately equal.
5. The rope according to claim 1, wherein splicing comprises weaving and/or braiding the first and second rope portion into each other.
6. The rope according to claim 1, wherein the second strand portions comprised by the second rope portion and the first strand portions comprised by the first rope portion are spliced into each other for forming the spliced connection.
7. The rope according to claim 1, wherein each second strand portion follows a different trajectory through the first rope portion than the other second strand portions.
8. The rope according to claim 1, wherein a total amount of the first strand portions of the first rope portion is approximately equal to a total amount of the second strand portions of the second rope portion.
9. The rope according to claim 1, wherein the first portion of the yarns of the jacket is approximately equal to the second portion of the yarns of the jacket.
10. The rope according to claim 1, wherein the rope contains a core separated in the end portion into two similar core portions, wherein at least part of these core portions are distributed evenly among the first and second rope portions.
11. The rope according to claim 1, wherein at least part of the spliced connection is provided with a cover.
12. The rope according to claim 1, provided with a socket inside the eye.
13. The rope according to claim 1, terminated at opposite end sides by two similarly formed eyes.
14. A method of forming an eye in a rope having a first rope portion and a second rope portion, the method comprising splicing the second rope portion and the first rope portion into each other for forming a spliced connection in the rope for obtaining the eye, wherein: the first rope portion and the second rope portion are obtained from an end portion of the rope; the rope comprises a jacket having yarns; the method comprises releasing at least a first portion of the yarns of the jacket and releasing at least a second portion of the yarns of the jacket, and providing the first portion of the yarns of the jacket around the first rope portion and providing the second portion of the yarns of the jacket around the second rope portion; the method comprises splicing at least one second strand portion of the second rope portion and at least one first strand portion of the first rope portion into each other for forming the spliced connection, wherein the at least one first strand portion of the first rope portion is distinct from the at least one second strand portion of the second rope portion; and the method comprises providing the first portion of the yarns of the jacket individually around each first strand portion of the first rope portion so that a yarn of the first portion of the yarns of the jacket surrounds only one of the first strand portions, and providing the second portion of the yarns of the jacket individually around each second strand portion of the second rope portion so that a yarn of the second portion of the yarns of the jacket surrounds only one of the second strand portions.
15. The method according to claim 14, wherein the first rope portion and the second rope portion are obtained by separating, before splicing, the end portion of the rope into the first rope portion and the second rope portion.
16. The method according to claim 14, wherein the spliced connection extends along substantially the whole eye.
17. The method according to claim 14, wherein the first rope portion is approximately equal to the second rope portion.
18. The method according to claim 14, wherein a thickness and/or cross section of the first rope portion and the second rope portion are approximately equal.
19. The method according to claim 14, wherein splicing comprises weaving and/or braiding the first and second rope portion into each other.
20. The method according to claim 14, comprising splicing the second strand portions of the second rope portion and the first strand portions of the first rope portion into each other for forming the spliced connection.
21. The method according to claim 14, wherein each second strand portion follows a different trajectory through the first rope portion than the other second strand portions.
22. The method according to claim 14, wherein a total amount of the first strand portions of the first rope portion is approximately equal to a total amount of the second strand portions of the second rope portion.
23. The method according to claim 14, wherein the first portion of the yarns of the jacket is approximately equal to the second portion of the yarns of the jacket.
24. The method according to claim 14, wherein the rope contains a core, and wherein separating the end portion of the rope includes separating the core into two similar core portions, wherein at least part of these core portions are distributed evenly among the first and second rope portions.
25. The method according to claim 14, comprising providing a cover over at least part of the spliced connection.
26. The rope according to claim 1, wherein the first rope portion and the second rope portion comprise a synthetic material.
27. The use of a rope according to claim 1, for exerting a force from an object on another object, with which the rope is connected by means of the eye.
28. The method according to claim 14, wherein the first rope portion and the second rope portion comprise a synthetic material.
29. The use of a rope manufactured according to claim 14, for exerting a force from an object on another object, with which the rope is connected by means of the eye.
30. The rope according to claim 1, wherein the whole spliced connection is provided with a cover.
31. The method according to claim 14, comprising providing a cover over the whole spliced connection.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The invention will now be described, in a non-limiting way, with reference to the accompanying drawings, in which:
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DETAILED DESCRIPTION
(14) Unless stated otherwise, like reference numerals refer to like elements throughout the drawings.
(15)
(16) In this embodiment, the at least one second strand portion may be distinct from the at least one first strand portion. Thus, in this embodiment, a second strand portion of the second strand portions and a first strand portion of the first strand portions may not be a portion of one and the same strand. This is contrary to known prior art ropes, wherein the first rope portion and the second rope portion comprise portions of the same strands. In known prior art ropes the strands that are present in the first rope portion continue along the rope over the distance between the first and the second rope portion and are thus also present in the second rope portion.
(17) Contrary to known prior art methods, in the first method the first rope portion 8 and the second rope portion 10 are obtained from an end portion 14 of the rope 4. In general, the end portion 14 typically extends from an end 12 of the rope 4 along the rope 4 until the first rope portion 8 and the second rope portion 10 end. The first and second rope portion 8, 10 may end at a position 16 that approximately coincides with a branching point 32 of the rope. Alternatively, the first and second rope portion 8, 10 may end at another position 16 along rope branches 33 of the rope spaced apart from the branching point 32. The end portion 14 corresponding with the latter situation is shown as well in
(18) The first method may comprise separating the end portion 14 of the rope into the first rope portion 8 and the second rope portion 10. This is illustrated in
(19) Each one of the rope branches 33 may comprise strand portions, as e.g. indicated in
(20) The first method further comprises splicing, after the optional separating, the second rope portion 10 and the first rope portion 8 into each other. Such splicing may comprise bringing the first rope portion 8 and the second rope portion 10 together. Such bringing together is indicated by arrows 15 in
(21) Various ways of splicing the first and second rope portion into each other may be used in the first method. According to a first way of splicing, the second strand portions of the second rope portion 10 may be spliced in the first strand portions of the first rope portion 8 for forming a spliced connection (not shown in
(22)
(23) After separating the end portion 14 as shown in
(24) Preferably, a length of the part 10A of the second rope portion and a length of the part 8A of the first rope portion are approximately equal to a length of the remaining part 8B of the first rope portion and a length of the remaining part 10B of the second rope portion. This is however not necessary.
(25) By splicing, the first strand portions and the second strand portions may be arranged in a uniform pattern. Such splicing is known as such and may be considered as interconnecting a second rope portion with a first rope portion, by weaving and/or braiding. For example, splicing may include guiding a single second strand portion through spaces between the first strand portions while, possibly repeatedly, crossing one or more of the first strand portions. Such guiding may be carried out for each one of the second strand portions. Each one of the second strand portions may be guided through a distinct sequence of spaces between the first strand portions. Thus, each second strand portion may follow a different trajectory through the first rope portion 8 than the other second strand portions. Analogously, splicing may include guiding a single first strand portion through spaces between the second strand portions while, possibly repeatedly, crossing one or more of the second strand portions. Of course, many other methods of splicing may be available and may be used. It may thus be clear that splicing may comprise weaving and/or braiding the first and second rope portion into each other.
(26) More in general, the spliced connection 17 may be formed by splicing mutually separated first and second rope portions 8, 10 terminating in the rope end 12 into each other. As the first and second rope portions 8, 10 in general may have a thickness less than the original rope thickness, the spliced connection can be thinner than for known prior art ropes. As the first and second rope portion 8, 10 may be obtained by longitudinally separating the rope 4 from its end 12 along the end portion 14, the spliced connection that extends along the eye 2 may even have a thickness W.sub.1 being similar to the original rope thickness W.sub.2, i.e. the thickness of a base part 25 of the rope 4 (
(27) More in general, a splicing pattern of the first strand portions and the second strand portions in the spliced connection 17 may be different from a pattern, e.g. a braiding or twisting pattern that strands, of which the first and second strand optionally are a portion, have in the base part 25 of the rope 4. Thus, the strands each comprising one of the first rope portions and the strands each comprising one of the second rope portions may be mutually interconnected in the spliced connection 17 differently than in the base part 25 of the rope 4. In a variation, a method according to the invention, for example the first method, may include optimizing a strength of the eye by varying the splicing pattern of the first and second rope portion, e.g. the splicing pattern of the first and second strand portions, in the spliced connection 17. During such optimizing, the base part 25 may be left substantially unchanged.
(28)
(29) It may be clear that, in the first embodiment of the rope, the second rope portion 10 and the first rope portion 8 are spliced into each other for forming the spliced connection 17 for obtaining the eye 2, wherein the first rope portion 8 and the second rope portion 10 are formed from the end portion 14 of the rope. In the first embodiment of the rope 4, the spliced connection 17 extends along at least part of the eye 2. Variations can be obtained depending on how far the spliced connection 17 extends along the eye 2. For example, the spliced connection 17 may at least extend along the eye 2 between mutually opposing parts 19A, 19B of the eye. An example of such mutually opposing parts 19A, 19B is shown in
(30) As another example, the spliced connection 17 may extend along substantially the whole eye. This can be obtained by minimising, e.g. shortening to be substantially equal to zero, a length of the parts 21A, 21B of the eye 2 along which the spliced connection 17 does not extend. Then, the spliced connection 17 may extend until the branching point 32 and/or the base part 25 of the rope. This can be obtained by choosing in the first method the position 16 at which the first and second rope portion 8, 10 end adjacent to, e. g. approximately coinciding with, the branching point 32. The example wherein the spliced connection 17 extends along substantially the whole eye is considered advantageous as an optimal strength of the eye can be obtained in this way.
(31) In general, the branching point 32 of the rope 4 may be considered as distinguishing the base part 25 of the rope from the eye 2 of the rope.
(32) Preferably, in the first embodiment of the rope having an eye, the first rope portion 8 is approximately equal to the second rope portion 10. This may for example be obtained by having a total amount of the first strand portions of the first rope portion 8 approximately equal to a total amount of the second strand portions of the second rope portion 10. In this way, in use of the rope 4, stress within the eye may be more evenly distributed among the first and second rope portion 8, 10. In this way a strength of the eye may be improved. The total amount of the first strand portions of the first rope portion 8 may for example be in a range from three to twelve, for example three, six, or twelve. Alternatively, the total amount of first strand portions of the first rope portion 8 may be smaller than three or larger than twelve.
(33) There may even be only a single strand portion in the first rope portion 8, and/or only a single strand portion in the second rope portion 10. Then, splicing the second rope portion 10 and the first rope portion 8 into each other may e.g. comprise twisting the first strand portion of the first rope portion 8 and the second strand portion of the second rope portion 10 into each other. The first strand portion may comprise a plurality of first yarns and the second strand portion may comprise a plurality of second yarns. Then, alternatively or additionally to twisting, splicing the second rope portion 10 and the first rope portion 8 into each other may comprise sliding of the first yarns and second yarns with respect to each other. Thus, a bundle of yarns may be obtained wherein the first yarns and the second yarns are rather uniformly distributed.
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(35) The second method may further comprise separating the end portion 14 of the rope into the first rope portion 8 and the second rope portion 10. Then, the rope 4 shown in
(36) When carrying out the first method, the second method, or another method according to the invention, a rope may be used wherein each first strand portion 26A may comprise a plurality of first substrand portions. Additionally, each second strand portion 26B may comprise a plurality of second substrand portions. A single strand may comprise multiple strands, i.e. substrands, itself. The term first substrand portion thus may refer to a portion of a substrand. The term second substrand portion may refer to a portion of another substrand. The first substrand portions of one first strand portion may be mutually braided or twisted or otherwise interconnected. Also, the second substrand portions of one second strand portion may be mutually braided or twisted or otherwise interconnected. This may hold for each first strand portion and each second strand portion.
(37) Substrands may be provided approximately in parallel within the base part 25 of the rope 4. However, in the spliced connection the first substrand portions may be arranged into first strand portions, and the second substrand portions may be arranged into second strand portions. Then, the first strand portion may comprise most of, e.g. all of, its strand. Similarly, the second strand portion may comprise most of, e.g. all of, its strand. A multitude of variations is possible for arranging the first and second substrand portions in the spliced connection. These variations are substantially independent from a configuration that the strands and substrands have in the base portion 25 of the rope. It may thus be clear from these examples that, more in general, a configuration, such as a braiding or twisting pattern, that strands and/or substrands have in the base part 25 of the rope 4 may be different from a configuration, such as a splicing pattern, of first and second strand portions, and/or first and second substrand portions, in the spliced connection. Different configurations of first and second strand portions, and/or first and second substrand portions, in the spliced connection can be tested, so that an optimal strength of the eye can be obtained.
(38) The core 30 may be included in the rope 4. The core may comprise core yarns. In general, the first and/or second method may comprise the step of distributing the yarns of the core 30, preferably evenly, among each individual one of the first strand portions and the second strand portions.
(39) The second method may further comprise providing the first portion 24A of the yarns of the jacket 22 around the first strand portions 26A of the first rope portion 8 and providing the second portion 24B of the yarns of the jacket 22 around the second strand portions 26B of the second rope portion 10. Preferably, the first portion 24A of the yarns of the jacket 22 is approximately equal to the second portion 24B of the yarns of the jacket 22. Thus, a total amount of yarns of the first portion 24A of the yarns of the jacket 22 may be approximately equal to a total amount of yarns of the second portion 24B of the yarns of the jacket 22.
(40) In this example, the first portion 24A of the yarns of the jacket 22 is provided individually around each first strand portion 26A of the first rope portion 8. That means that one yarn of the first portion 24A of the yarns of the jacket 22 may surround only one of the first strand portions 26A when being provided around that first strand portion 26A. Analogously, in this example the second portion 24B of the yarns of the jacket is provided individually around each second strand portion 26B of the second rope portion 10. After this step, the rope 4 shown in
(41) The second method may further comprise forming the eye according to the first method by using the rope 4 shown in
(42) In the second embodiment of the rope 4 having the eye 2, the first rope portion 8 and the second rope portion 10 are formed from the end portion 14 of the rope 4. In the rope 4 thus obtained, the first portion 24A of the yarns of the jacket may be provided individually around each first strand portion 26A of the first rope portion 8. Furthermore, the second portion 24B of the yarns of the jacket may be provided individually around each second strand portion 26B of the second rope portion 10. In this way the first and second portions 24A, 24B of the yarns add to a strength of the eye 2. Cutting the jacket for being able to reach the first rope portion when splicing the second rope portion and the first rope portion into each other, may be prevented.
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(44) The rope 4 may have the jacket 22. The first and second strand portions 26A, 26B may be formed by strands that extend approximately parallel along the rope 4 inside the jacket 22 of the base part 25 of the rope 4, although alternatively they may have a different configuration. Analogously, the first and second substrand portions may be formed by substrand portions that extend inside the jacket 22 approximately parallel along the length of the base part of the rope 4, although alternatively they may have a different configuration.
(45) The fourth method comprises splicing one of the first strand portions 26A.i and one of the second strand portions 26B.i into each other. This may be carried out for each first strand portion 26A.i and each second strand portion 26B.i. In this way a plurality, in this example five, spliced subconnections 17.i can be obtained, as shown in
(46) A cross-sectional area A.i may be associated with a width W.sub.1.i of one of the spliced subconnections 17.i. The sum of the area's A.i may be approximately equal to a cross-sectional area A of the base part of the rope that may be associated with the width W.sub.2 of the base part 25 of the rope 4. The subparts 21A.i, 21B.i of the eye along which the spliced subconnections 17.i do not extend may be substantially minimised, e.g. may be limited to be substantially equal to zero. As a result, the spliced connection 17 of the rope in the third embodiment may extend along substantially the whole eye.
(47) For the first, second, and third embodiment of the rope 4, at least part, and preferably the whole, of the spliced connection 17 may be provided with a cover 28, e.g. shown in
(48) In the first, second, and third embodiment of the rope, only one end side of the rope 4 is described, at which end side the eye 2, the end 12, and the end portion 14 are located. However, the rope 4 may be provided at its other end side with a similar eye 2. Then, the rope 4 may be terminated at opposite end sides by two similarly formed eyes. The first and/or second method may comprise forming similar eyes at both end sides of the rope 4. Such a two-eyed rope 4 is especially suitable for exerting a force, from a ship to one of another ship, an off-shore platform, and an anchor. Then, the rope is connected to the ship with one eye and is connected to the one of the other ship, the off-shore platform, and the anchor with the other eye. More in general the rope 4, with one or two eyes, is especially suitable for maritime applications. The thickness W.sub.2 of the base part of the rope 4 may e.g. be in a range between several, e.g. three, and several tens, e.g. thirty, centimeter.
(49) One or optionally both eyes of the rope 4 may be provided with a socket (not shown but known as such to the skilled person) inside the eye. Such a socket is for example substantially made of a metallic material. Especially in case the spliced connection 17 extends along substantially the whole eye, the rope 4 having the eye 2 may advantageously be provided with the socket. Surprisingly, it turns out that the eye 2 formed according to the invention is better shaped at a branching point 32 of the eye 2 for receiving the socket.
(50) In general, the first rope portion 8 and second rope portion 10 may comprise a synthetic material. The rope may e.g. be substantially made of the synthetic material. Such a material may for example contain polyamide, polyester, polyethylene, polypropylene, high modulus polyethylene, polyaramide, ultra-high molecular weight polyethylene, and aramid. More in particular the synthetic material may, alternatively or additionally, contain Kevlar and/or Dyneema. The jacket 22 and/or the core 30 may for example contain one or more similar synthetic materials. Alternatively or additionally, the jacket, core and strands may comprise mutually different materials.
(51) Three methods of forming the eye, and variants thereof, have been described. Of course many more methods fall within the scope of the invention defined in the claims. The substrands may e.g. themselves comprise strands, i.e. sub-substrands, and/or yarn bundles. These may be employed when forming the spliced connection 17 and possibly when forming one or more, e.g. all, of the spliced subconnections 17.i. These may also be employed for possibly forming sub-subconnections which are comprised by one of the spliced subconnections 17.i. For example, first strand portions, first substrand portions, first sub-substrand portions and/or first yarn bundles of the first rope portion 8 and second strand portions, second substrand portions, second sub-substrand portions and/or second yarn bundles of the second rope portion 10 may be spliced into each other for forming the spliced connection 17. Optimising the strength of the eye may comprises defining a division of the first rope portion 8 and the second rope portion 10 into first and second strand portions, first and second substrand portions, first and second sub-substrand portions, and/or first and second yarn bundles. Such optimising may be substantially independent from a configuration of the base part 25 of the rope. Thus, a configuration that strands, substrands, sub-substrand, and/or yarn bundles have in the base part of the rope may be different than in the spliced connection 17. All such variations of the rope and the method of forming an eye in the rope are considered to fall within the scope of the present invention. The invention is not limited to any embodiment herein described and, within the purview of the skilled person, modifications are possible which may be considered within the scope of the appended claims. For example, the rope may be substantially made of steel instead of the synthetic material. As another example, if e.g. after splicing extremities of yarns and/or strand portions sticking partly out of the eye may be cut to establish a relatively smooth outer surface, the first rope portion and the second rope portion are still considered to be formed from an end portion of the rope. Also, in an embodiment, the branching region of the rope may be provided with a whipping e.g. to protect the branching point. When around the eye a cover is provided, the cover may be connected to the whipping to form an endless cover over the eye and the branching region. Equally all kinematic inversions are considered inherently disclosed and to be within the scope of the present invention. The use of expressions like: preferably, in particular, especially, typically etc. is not intended to limit the invention. The indefinite article a or an does not exclude a plurality. Features which are not specifically or explicitly described or claimed may be additionally included in the structure according to the present invention without deviating from its scope.