Rope, rope manufacturing method, auxiliary rope

Abstract

To provide a rope, which allows uniformity of strands to be held without changing arrangement of the strands and can suppress reduction in breaking strength without changing interval of pitches of a main body rope and make the rope hard to be broken, a manufacturing method thereof, and an auxiliary rope.SOLUTION: An annular eye part of a rope is composed of the folding part by inserting the one of the pair of facing parts into the S side insertion part along the Z strand set and inserting the other of the pair of facing parts into the Z side insertion part along the S strand set so that the pair of facing parts are disposed on one end side and the folding part is disposed on the other end side in a length direction of the auxiliary rope.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a rope having a looped portion in the longitudinal direction, a manufacturing method thereof, and an auxiliary rope. [Background technology]

[0002] A method called an ice splice has been used for some time, in which the end of a rope is bent into a circle and then processed or tied into a loop. For example, Patent Document 1 describes this ice splice.

[0003] The above-mentioned Patent Document 1 describes an ice splice using a three-strand rope, which is constructed by unraveling a three-strand rope consisting of two green strands and one red strand strand by strand to create processing allowances, placing the red strand in the center and the green strands on either side (splitting) and then passing each strand in turn through the main body of the three-strand rope, as shown in Figures 7 to 10. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-236380 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned Patent Document 1, when performing the ice splice, a three-strand rope is disassembled into three strands by creating a processing allowance and preparing the opening (splitting). Therefore, the ice splice described in Patent Document 1 causes problems such as the alignment of each strand becoming disordered, reducing the rope's breaking strength. Furthermore, in the ice splice described in Patent Document 1, for example, in the main body of the three-strand rope through which the strands are threaded, the strands are forced apart to thread the disassembled strands, causing the strand alignment to become disordered, resulting in uneven lengths of each strand within the pitch (lay interval), and each strand no longer bearing an equal load. Furthermore, as the pitch becomes shorter, the strand angle becomes larger, reducing the rope's breaking strength. These problems are not limited to the above-mentioned ice splice described in Patent Document 1, but occur in all cases where a rope is disassembled into strands and the strands are inserted into the rope.

[0006] Therefore, the present invention provides a rope with a ring-shaped portion in the length direction, a manufacturing method thereof, and an auxiliary rope, which can suppress a decrease in the breaking strength of the main rope and make it less likely to break, without disassembling the main rope into strands and without the need to insert the disassembled strands into the main rope. [Means for solving the problem]

[0007] The present invention provides an auxiliary rope that is shorter than the main rope and includes a main rope having a plurality of first strands, a main rope having a plurality of S-strand sets formed by braiding second strands in the S direction, and a plurality of Z-strand sets formed by braiding second strands in the Z direction, and is configured by combining the S-strand sets and the Z-strand sets, and includes an S-side joint portion formed between the parallel S-strand sets where the plurality of Z-strand sets are combined, and an auxiliary rope that is shorter than the main rope and includes a Z-side joint portion formed between the parallel Z-strand sets where the plurality of S-strand sets are combined, and the main rope includes a folded portion formed by folding back in the length direction and a pair of opposing portions, and the pair of opposing portions includes a first opposing portion that receives a tensile force and a free end. and a second opposing portion, wherein the S-side joint portion comprises an S-side insertion portion configured as a space into which either the first opposing portion or the second opposing portion is inserted, and the Z-side joint portion comprises a Z-side insertion portion configured as a space into which the other of the first opposing portion or the second opposing portion is inserted, and one of the pair of opposing portions, the first opposing portion or the second opposing portion, is inserted into the S-side insertion portion so as to be along the Z-strand set, and the other of the first opposing portion or the second opposing portion is inserted into the Z-side insertion portion so as to be along the S-strand set, so that the pair of opposing portions is located at one end side and the turned-back portion is located at the other end side in the longitudinal direction of the auxiliary rope, thereby causing the turned-back portion to form a circular eye portion.

[0008] According to the above configuration, one of the strands is inserted into the S-side insertion portion and the other is inserted into the Z-side insertion portion, and the folded portion forms a circular eye portion. Therefore, the eye portion can be formed without disassembling the main rope into the first strands and without having to insert the disassembled strands into the main rope, thereby preventing a decrease in the breaking strength of the rope.

[0009] Furthermore, in the rope of the present invention, the S-side insertion portion may be configured in a state where at least one of the second strands constituting the Z-strand set is missing from the S-side joint portion, and the Z-side insertion portion may be configured in a state where at least one of the second strands constituting the S-strand set is missing from the Z-side joint portion, and the number of missing second strands may be the same in the Z-strand set and the S-strand set.

[0010] According to the above configuration, since the number of missing second strands in the Z strand set and the S strand set is the same, it is possible to prevent imbalance in the Z direction and the S direction, which are the directions in which the auxiliary rope is assembled, and to maintain the shape of the auxiliary rope.

[0011] The main rope may also include a covering portion that covers the outer periphery of the plurality of first strands.

[0012] According to the above configuration, the covering portion covers the outer periphery of the plurality of first strands, thereby blocking contact between the first strands and the second strands and preventing the first strands and the second strands from contacting and damaging each other, and the eye portion can be formed without peeling the covering portion off the main rope.

[0013] In addition, in the present invention, the second strand constituting the S-strand set may be a Z-twisted strand formed by twisting wires in the Z direction, and the second strand constituting the Z-strand set may be an S-twisted strand formed by twisting wires in the S direction.

[0014] According to this configuration, the strength of the assembled rope can be stably increased without applying excessive twisting to the wires.

[0015] The present invention may also be a rope manufacturing method for manufacturing the above-mentioned rope, comprising a pulling step of pulling out the second strand that constitutes the Z strand set from the S-side joint portion, thereby configuring the space from which the second strand is pulled out as the S-side insertion portion, and pulling out the second strand that constitutes the S strand set from the Z-side joint portion, thereby configuring the space from which the second strand is pulled out as the Z-side insertion portion.

[0016] According to the above configuration, for example, by removing one second strand braided in the Z direction and one second strand braided in the S direction from an eight-strand rope, the spaces left by the second strand braided in the Z direction and the second strand braided in the S direction, respectively, from the S-side joint portion and the Z-side joint portion can form the S-side insertion portion and the Z-side insertion portion.

[0017] The present invention may also be a rope manufacturing method for manufacturing the above-mentioned rope, comprising an auxiliary rope making step of combining the S strand set and the Z strand set to form the auxiliary rope, wherein in the auxiliary rope making step, the S strand set and the Z strand set are combined so that the parallel S strand sets contain a different number of second strands and the parallel Z strand sets contain a different number of second strands, and the S-side insertion portion is configured as a space corresponding to the number of second strands that differ between the multiple Z strand sets being combined, and the Z-side insertion portion is configured as a space corresponding to the number of second strands that differ between the multiple S strand sets being combined.

[0018] According to the above configuration, the S-side insertion portion is configured as a space corresponding to the number of second strands that differ between the Z strand sets that are combined, and the Z-side insertion portion is configured as a space corresponding to the number of second strands that differ between the second strand sets that are combined. Therefore, by performing the auxiliary rope creation process, the auxiliary rope can be constructed and the S-side insertion portion and the Z-side insertion portion can be formed.

[0019] In addition, the rope manufacturing method of the present invention includes an insertion process of inserting the first opposing portion into either the S-side insertion portion or the Z-side insertion portion, and inserting the second opposing portion into the other of the S-side insertion portion or the Z-side insertion portion, and in the insertion process, the first opposing portion may be inserted into either one of the portions from one end side to the other end side of the auxiliary rope in the longitudinal direction, and the second opposing portion may be inserted into the other of the portions from the other end side to one end side of the auxiliary rope in the longitudinal direction.

[0020] According to the above configuration, in the insertion process, for example, the first opposing portion is inserted into the S-side insertion portion from one end side to the other end side in the longitudinal direction of the auxiliary rope, and the second opposing portion is inserted into the Z-side insertion portion from the other end side to one end side in the longitudinal direction of the auxiliary rope, so that the main rope can move back and forth in the longitudinal direction of the auxiliary rope.

[0021] The present invention also provides an auxiliary rope comprising a plurality of S-strand sets formed by braiding strands in the S direction and a plurality of Z-strand sets formed by braiding strands in the Z direction, and formed by combining the S-strand sets and the Z-strand sets, wherein an S-side joint where the plurality of Z-strand sets are combined is formed between the parallel S-strand sets, and a Z-side joint where the plurality of S-strand sets are combined is formed between the parallel Z-strand sets, the plurality of Z-strand sets combined at the S-side joint have a different number of strands, the plurality of S-strand sets combined at the Z-side joint have a different number of strands, and the spaces within the S-side joints corresponding to the number of different strands in the plurality of Z-strand sets are configured as S-side insertion sections into which a separately formed main rope can be inserted, and the spaces within the Z-side joints corresponding to the number of different strands in the plurality of S-strand sets are configured as Z-side insertion sections into which the main rope can be inserted. [Effects of the Invention]

[0022] As described above, according to the present invention, by configuring the eye portion without disassembling the main rope into strands or inserting the disassembled strands into the main rope, it is possible to suppress a decrease in the breaking strength of the rope and make the rope less likely to break. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a diagram showing a main rope and an auxiliary rope according to one embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing details of the auxiliary rope, where (a) is a diagram showing the S-side joint portion, and (b) is a diagram showing the Z-side joint portion. [Figure 3] FIG. 3 is a diagram showing the rope in a state where the main rope is inserted into the S-side joint so as to follow the Z-strand set. [Figure 4] FIG. 4 is a diagram showing the state of the rope in which the main rope has been inserted into the Z-side joint portion so as to follow the S-strand set, following the state shown in FIG. [Figure 5] FIG. 5 is an enlarged view of the V portion of the rope in the state shown in FIG. [Figure 6] FIG. 6 is a table showing comparative strengths in Example 1 and Comparative Examples 1 to 3. DETAILED DESCRIPTION OF THE INVENTION

[0024] An embodiment of the rope of the present invention will be described below. Ropes are used, for example, when mooring ships, mooring floating bodies, etc., when unloading cargo at fishing grounds, and for saving lives.

[0025] In the following explanation, the length direction of the rope will be referred to as the "length direction," and the direction of the rope's thickness or diameter will be referred to as the "radial direction." Furthermore, in the following explanation, the "S direction" refers to the direction extending from one side of the length direction to the other while going counterclockwise around the length direction, and the "Z direction" refers to the direction extending from one side of the length direction to the other while going clockwise around the length direction.

[0026] As shown in FIG. 1 , the rope 1 is constructed by combining a main rope 2 and an auxiliary rope 3, each of which is constructed as a separate body. The main rope 2 includes a rope body 20 and a covering 21 that covers the rope body 20. The main rope 2 of this embodiment is a three-strand rope constructed by twisting together three first strands 20a. Here, a "strand" refers to, for example, a strand constructed by aggregating and solidifying fibers, or a strand constructed by twisting together multiple wires (e.g., first wires and second wires) (specifically, multiple twisting together of yarns constructed by twisting together multiple raw threads). The rope body 20 of this embodiment is a rope constructed from polyester (specifically, PET resin). The main rope 2 of this embodiment has a diameter of 8 mm. In this embodiment, as shown in Figure 1, a main rope 2 is used that is constructed by twisting three first strands 20a together in a Z twist, but this is not limited to this, and the main rope 2 may be constructed by twisting them together in an S twist, or it may be a braided rope that is constructed by arranging multiple strands around a core.

[0027] The covering portion 21 of this embodiment covers the entire length of the rope body 20 (specifically, the three twisted first strands 20a) from the outer periphery. Therefore, the covering portion 21 of this embodiment protects the rope body 20 from the outside and contributes to improving the damage resistance of the main rope 2. The covering portion 21 of this embodiment is made of resin (specifically, polyurethane elastomer).

[0028] As shown in Fig. 1, the main rope 2 of this embodiment is configured so that the ends in the longitudinal direction are tapered. That is, the main rope 2 has both ends in the longitudinal direction tapered by cutting the rope body 20 and the covering portion 21 obliquely at both ends in the longitudinal direction.

[0029] The main rope 2 is configured so that at least the end A in the longitudinal direction can be folded back from a state in which it extends in the longitudinal direction as shown in FIG. 1. Therefore, in this embodiment, as shown in FIGS. 3 and 4, by folding back the end A in the longitudinal direction of the main rope 2, a substantially U-shaped folded-back portion 2α is formed in the middle portion in the longitudinal direction. Furthermore, by folding back the end A in the longitudinal direction of the main rope 2, one end side and the other end side in the longitudinal direction face each other with the folded-back portion 2α in between. Therefore, when the end A in the longitudinal direction is folded back, the main rope 2 has a pair of opposing portions 2a (specifically, a first opposing portion 2b and a second opposing portion 2c) that face each other. The pair of opposing portions 2a includes the end A in the longitudinal direction.

[0030] The first opposing portion 2b is the side of the main rope 2 that receives a tensile force. Specifically, the main rope 2 is used by fixing, for example, the end A side of the first opposing portion 2b in the longitudinal direction and pulling the folded-back portion 2α side. In the second opposing portion 2c, the end A in the longitudinal direction is not fixed and constitutes a free end. Therefore, the second opposing portion 2c includes the free end of the main rope 2.

[0031] The auxiliary rope 3 assists in forming the eye portion I of the main rope 2. This auxiliary rope 3 is used in combination with the main rope 2 that is configured as a separate body. In this embodiment, the auxiliary rope 3 is used to form the eye of the main rope 2. As shown in FIGS. 1 and 2(a) and (b), the auxiliary rope 3 includes a plurality of second strands 3a that are strands. Here, the second strands 3a include a plurality of Z-twisted strands 30 configured by twisting a plurality of element wires in the Z direction and a plurality of S-twisted strands 31 configured by twisting a plurality of element wires in the S direction. The auxiliary rope 3 is also configured by combining the Z-twisted strands 30 and the S-twisted strands 31 in the S direction and the Z direction, respectively. In the auxiliary rope 3 of this embodiment, the Z-twisted strands 30 and the S-twisted strands 31 are arranged in the radial direction so that the Z-twisted strands 30 and the S-twisted strands 31 are parallel to each other, respectively. Specifically, as shown in FIG. 2(a), two Z-twisted strands 30 and one Z-twisted strand 30 arranged side by side are braided in the S direction, and as shown in FIG. 2(b), two S-twisted strands 31 and one S-twisted strand 31 arranged side by side are braided in the Z direction, forming the auxiliary rope 3 of this embodiment. Therefore, the auxiliary rope 3 of this embodiment is composed of six second strands 3a. Note that, for ease of explanation, the second strands 3a braided and arranged in a rope shape will be referred to as a "strand set" below, and the directions in which the strand sets are braided into the rope (S direction, Z direction) will also be referred to as an "S-strand set" and a "Z-strand set." Therefore, two Z-twisted strands 30 arranged side by side are braided in the S direction and will be referred to as an S-strand set 300, and one Z-twisted strand 30 parallel to the S-strand set 300 will be referred to as an S-strand set 301. Furthermore, two S-twisted strands 31 arranged side by side are braided in the Z direction and are therefore referred to as a Z-strand set 310, and one S-twisted strand 31 parallel to the Z-strand set 310 is referred to as a Z-strand set 311.

[0032] As shown in Figures 1 and 2(a), in the auxiliary rope 3 of this embodiment, the Z strand set 311 and the Z strand set 310 are configured to be arranged in the Z direction. Also, as shown in Figure 2(b), the S strand set 301 and the S strand set 300 are arranged in the S direction. That is, in the auxiliary rope 3 of this embodiment, between the start and end of any strand set in the length direction, a strand set parallel to each other in the radial direction is arranged.

[0033] As shown in FIG. 1, the auxiliary rope 3 of this embodiment is configured so that its radial and longitudinal dimensions are different from those of the main rope 2. Specifically, the second strand 3a constituting the auxiliary rope 3 of this embodiment has a diameter of 8 mm, which is approximately the same as the diameter of the main rope 2. As described above, the auxiliary rope 3 of this embodiment is intended to assist in the formation of the eye portion I of the main rope 2. Therefore, the auxiliary rope 3 has a shorter length than the main rope 2. In addition, in the auxiliary rope 3 of this embodiment, the longitudinal ends B, B are fixed by wrapping with adhesive tape, bonding with an adhesive, heat fusion, or the like to prevent the combined strands from coming apart. Therefore, the longitudinal end B of the auxiliary rope 3 includes a fixed fixing portion B1.

[0034] The auxiliary rope 3 of this embodiment is configured by arranging the S strand sets 300, 301 in parallel with each other and the Z strand sets 310, 311 in parallel with each other, and combining the S strand sets 300, 301 and the Z strand sets 310, 311 in the S direction and the Z direction, respectively. Therefore, as shown in Fig. 2(a), the space between the parallel S strand sets 300, 301 is configured as an S-side joint C. Furthermore, as shown in Fig. 2(b), the space between the Z strand sets 310, 311 is configured as a Z-side joint D.

[0035] As shown in Fig. 2(a), in this embodiment, Z strand sets 310 and 311 are inserted through the S-side joint C. Also, as shown in Fig. 2(b), S strand sets 300 and 301 are inserted through the Z-side joint D.

[0036] As described above, in the auxiliary rope 3 of this embodiment, the Z-strand set 310 and the Z-strand set 311 are parallel to each other. In the Z-strand sets 310, 311 combined in the S-side joint C, the number of second strands 3a constituting the Z-strand set 311 is one less than the number of second strands 3a constituting the Z-strand set 310, and the number of second strands 3a is different. Therefore, as shown in FIG. 2(a), a space is formed in the S-side joint C through which the S-twisted strand 31 is inserted between the parallel Z-strand sets 310, 311, corresponding to the difference in the number of S-twisted strands 31. This space is referred to as the S-side insertion portion C1. That is, the S-side joint C of this embodiment includes the S-side insertion portion C1.

[0037] In this embodiment, the parallel S-strand sets 300, 301 also have different numbers of Z-twisted strands 30. Therefore, as shown in Fig. 2(b), the Z-side joint portion D has a Z-side insertion portion D1, which is a space corresponding to the number of different Z-twisted strands 30 in the parallel S-strand sets 300, 301.

[0038] Next, a method for manufacturing the rope 1 of this embodiment will be described. To form the rope 1 of this embodiment, first, as a preliminary step, a main rope 2 and an auxiliary rope 3 are prepared as shown in Fig. 1. The preparation of the main rope 2, which is included in the preliminary step, includes, for example, twisting three first strands 20a into a Z-twist to form the rope main body 20, covering the outer periphery of the rope main body 20 with a covering portion 21, and cutting both ends of the main rope 2 in the longitudinal direction at an angle.

[0039] The auxiliary rope 3 of this embodiment is prepared by an auxiliary rope fabrication process, which fabricates the auxiliary rope 3. The auxiliary rope fabrication process of this embodiment includes an eight-strand fabrication process and a drawing process. The auxiliary rope fabrication process of this embodiment first includes an eight-strand fabrication process, which includes S-strand sets 300, 300 formed by braiding two Z-twisted strands 30 in the S direction and Z-strand sets 310, 310 formed by braiding two S-twisted strands 31 in the Z direction, and then combines the S-strand sets 300, 300 and the Z-strand sets 310, 310 in the S direction and Z direction, respectively, to form an eight-strand fabric.

[0040] In the eight-in-a-strand process, the Z-strand sets 310, 310, which are parallel in the radial direction, are joined to the S-side joints C formed between the S-strand sets 300, 300, which are parallel in the radial direction. The S-strand sets 300, 300, which are parallel in the radial direction, are joined to the Z-side joints D formed between the Z-strand sets 310, 310, which are parallel in the radial direction. In this embodiment, the Z-strand sets 310, 310 are joined to the S-side joints C, and the S-strand sets 300, 300 are joined to the Z-side joints D throughout the entire length. Then, both ends B, B in the length direction are fixed to form the fixed parts B1. An eight-in-a-strand rope is constructed in this manner.

[0041] Next, a removal process is performed in which the S-twisted strand 31 is removed from the S-side joint C and the Z-twisted strand 30 is removed from the Z-side joint D. In the removal process of this embodiment, the same number of second strands 3a (specifically, one strand each) are removed from one S-strand group 300 and one Z-strand group 310 of the 8-strand rope formed in the 8-strand rope process, thereby forming the S-strand group 301 and the Z-strand group 311. Therefore, in this embodiment, the second strands 3a are removed throughout the entire length of the 8-strand rope, thereby forming an auxiliary rope 3 composed of six second strands 3a. Here, as described above, in the removal process, the second strands 3a as the S-twisted strand 31 are removed from the Z-strand group 310 combined at the S-side joint C, and the second strands 3a as the Z-twisted strand 30 are removed from the S-strand group 300 combined at the Z-side joint D. Therefore, at each of the S-side joint C and the Z-side joint D, spaces (specifically, the S-side insertion portion C1 and the Z-side insertion portion D1) are formed in the locations where the second strands 3a are removed and missing. As a result of the removal process, the auxiliary rope 3 of this embodiment has the same strand arrangement as an eight-strand rope with six second strands 3a.

[0042] The above is a description of the preliminary steps. Next, an insertion step is performed in which the main rope 2 is inserted into the auxiliary rope 3. In the insertion step of this embodiment, first, a Z-direction insertion step is performed in which the longitudinal end A including the free end of the main rope 2 is inserted into the S-side insertion portion C1 along the S-twisted strand 31. Specifically, in the Z-direction insertion step, the main rope 2 is inserted into the S-side insertion portion C1 formed between the S-strand sets 300, 301 braided in the S-direction, between the fixing portions B1, B1 provided at both longitudinal ends of the auxiliary rope 3, along the Z-strand set 311 braided in the Z direction.

[0043] In the Z-direction insertion step of this embodiment, the tapered end A of the main rope 2 in the longitudinal direction is inserted into the S-side insertion portion C1 while being aligned with the Z strand set 311 in the Z direction. As a result, the main rope 2 advances from one side to the other in the longitudinal direction of the auxiliary rope 3. Note that in this embodiment, as shown in FIG. 3, the main rope 2 is aligned with the Z strand set 311 for approximately three turns in the Z direction. Therefore, an excess portion E into which the main rope 2 is not inserted is formed on the other side of the auxiliary rope 3 in the longitudinal direction.

[0044] After the Z-direction insertion step is completed by aligning the main rope 2 along the Z-strand set 311 in the Z direction, a folding back step is subsequently performed in which the main rope 2 is folded back in the length direction. As shown in FIG. 3, in this folding back step, the end A side of the main rope 2 in the length direction, which has been inserted into the Z-strand set 311 and moved from end B side on one side of the length direction of the auxiliary rope 3 to end B side on the other side, is folded back in the length direction. As a result, the middle portion of the main rope 2 in the length direction forms a substantially U-shaped folded back portion 2α. The folded back main rope 2 also has a second opposing portion 2c including end A in the length direction, and a first opposing portion 2b inserted into the S-side insertion portion C1. As shown in FIGS. 3 and 4, a pair of opposing portions 2a is arranged on one side in the length direction (the right side in FIGS. 3 and 4), and a folded back portion 2α is arranged on the other side (the left side in FIGS. 3 and 4).

[0045] Next, in this embodiment, the insertion process is performed again. Here, as the insertion process in this embodiment, an S-direction insertion process is performed. In this S-direction insertion process, the main rope 2 is inserted into the Z-side insertion portion D1 along the S-strand set 301 from the other end B toward one end B in the longitudinal direction of the auxiliary rope 3. Here, in this embodiment, since the parallel S-strand sets 300, 301 have different numbers of Z-twisted strands 30, the Z-side joint portion D includes a Z-side insertion portion D1. Therefore, in the S-direction insertion process, the second opposing portion 2c of the main rope 2 is inserted into the Z-side insertion portion D1 from the other end toward one side in the longitudinal direction of the auxiliary rope 3. In this embodiment, the second opposing portion 2c is advanced to one side in the longitudinal direction while aligning it with the S strand set 301 for approximately three turns in the S direction so that an excess portion E where the main rope 2 is not inserted remains on one side in the longitudinal direction of the auxiliary rope 3.

[0046] In the S-direction insertion step, the second opposing portion 2c is inserted radially inward (toward the axial center of the auxiliary rope 3) of the first opposing portion 2b that is along the Z strand set 311 in the Z direction. In particular, in this embodiment, the second opposing portion 2c is advanced to one side in the lengthwise direction while being aligned along the S strand set 301 for approximately three turns in the S direction so that an excess portion E into which the main rope 2 is not inserted remains in the lengthwise direction of the auxiliary rope 3. Therefore, as shown in FIG. 5, the S-direction insertion step is completed when the second opposing portion 2c is inserted into the Z-side insertion portion D1 radially inward (toward the axial center of the auxiliary rope 3) of the first opposing portion 2b.

[0047] In this way, the pair of opposing portions 2a of the main rope 2 are inserted into the S-side insertion portion C1 and the Z-side insertion portion D1 of the auxiliary rope 3, respectively, thereby combining the main rope 2 and the auxiliary rope 3. Therefore, by inserting the pair of opposing portions 2a into the S-side insertion portion C1 and the Z-side insertion portion D1 of the auxiliary rope 3, respectively, and fastening them firmly, the turned-back portion 2α is configured as an annular eye portion I. In the case of mooring a ship, for example, this annular eye portion I is passed through and hung on a mooring bollard or bitt that is erected vertically from the ground.

[0048] As described above, according to this embodiment, the first opposing portion 2b is inserted into the S-side insertion portion C1, and the second opposing portion 2c is inserted into the Z-side insertion portion D1, so that the folded-back portion 2α forms a ring-shaped eye portion I. Therefore, the eye portion I can be formed without disassembling the main rope 2 into the three first strands 20a, and without having to insert the disassembled strands into the main rope 2, thereby suppressing a decrease in the breaking strength of the rope 1.

[0049] Furthermore, according to this embodiment, the same number of S-twisted strands 31 and Z-twisted strands 30 are pulled out, so that the auxiliary rope 3 can be prevented from losing balance and can maintain its shape.

[0050] Furthermore, according to this embodiment, the covering portion 21 covers the outer periphery of the twisted first strand 20a, and thus the covering portion 21 blocks contact between the first strand 20a and the second strand 3a, preventing the first strand 20a and the second strand 3a from contacting each other and damaging each other. As a result, the breaking strength of the main rope 2 can be increased.

[0051] In addition, in this embodiment, by removing the S-twisted strands 31 and the Z-twisted strands 30 one by one from the eight-strand rope, the spaces left by removing the S-twisted strands 31 and the Z-twisted strands 30 from the S-side joint portion C and the Z-side joint portion D can form the S-side insertion portion C1 and the Z-side insertion portion D1.

[0052] Furthermore, in the insertion process of this embodiment, in the Z-direction insertion process (see Figure 3), the second opposing portion 2c is inserted into the S-side insertion portion C1 so as to move from one side to the other in the longitudinal direction of the auxiliary rope 3, and in the S-direction insertion process (see Figure 4), the second opposing portion 2c is inserted into the Z-side insertion portion D1 so as to move from the other side to one side in the longitudinal direction of the auxiliary rope 3, so that the main rope 2 can move back and forth in the longitudinal direction of the auxiliary rope 3.

[0053] In addition, in this embodiment, the longitudinal ends of the main rope 2 are configured to have a tapered shape, making it easy to insert the longitudinal ends into the S-side insertion portion C1 and the Z-side insertion portion D1.

[0054] Moreover, in this embodiment, the second opposing portion 2c is disposed on the inner side (axial center side) of the first opposing portion 2b in the radial direction of the auxiliary rope 3, and the first opposing portion 2b tightens the second opposing portion 2c from the outer side in the radial direction of the auxiliary rope 3, so that the first opposing portion 2b presses the second opposing portion 2c from the outer side in the radial direction, thereby preventing the second opposing portion 2c from slipping out of the Z-side joint D of the auxiliary rope 3. In particular, when the rope 1 is in use, a tensile force is applied to the first opposing portion 2b, and the tensile force allows the first opposing portion 2b to tighten the second opposing portion 2c.

[0055] Furthermore, in this embodiment, a so-called coated rope in which the rope body 20 is coated with the coating portion 21 can be used as the main rope 2, so there is no need to peel off the coating portion 21, and the coated rope can be used as the main rope 2 as is. Conventionally, when forming the eye I with a coated rope, it was necessary to peel off the coating portion 21. This required the effort of peeling off the coating portion 21 and care to avoid damaging the main rope 2 when peeling off the coating portion 21. On the other hand, with the rope 1 of this embodiment, the coated rope can be used as the main rope 2 as is without peeling off the coating portion 21, which reduces the number of work steps and eliminates the need to be careful not to damage the main rope 2.

[0056] In addition, in the rope 1 of this embodiment, there is an excess portion E at the longitudinal end B of the auxiliary rope 3, so that as the tension applied to the main rope 2 increases, it is tightened along its entire length, making it difficult for the main rope 2 to slip out of the auxiliary rope 3.

[0057] Furthermore, in this embodiment, the diameter of the second strand constituting the auxiliary rope 3 is approximately the same as the diameter of the main rope 2, so by removing the second strand 3a in the removal process, the main rope 2 can be inserted tightly into the space (specifically, the S-side insertion portion C1 and the Z-side insertion portion D1) where the second strand 3a is missing. [Example]

[0058] The present invention will be further explained below with reference to Example 1.

[0059] [Example 1] The eye section was formed by inserting the main rope, which was an 8mm polyester rope covered with a coating made of polyurethane, into the auxiliary rope, which had 15 S-side insertion sections and 15 Z-side insertion sections, 15 times in each of the Z and S directions.

[0060] [Comparative Example 1] The main rope, which was an 8 mm polyester rope covered with a coating made of polyurethane, was folded back in the length direction and the eye section was formed by fastening the folded back part with multiple wire clips.

[0061] Comparative Example 2 As described above, the main rope, which was an 8 mm polyester rope covered with a covering made of polyurethane, was folded back in the lengthwise direction and the folded part was tightened with a rope catcher to form an eye section.

[0062] Comparative Example 3 For a rope comprising a rope body made of three twisted strands and a covering covering the rope body, the covering was peeled off at one end and in the middle of the rope in the length direction, and then the one end of the rope was folded back into a loop, and the one end of the rope was disassembled into three strands, and each of the strands was inserted into a braid in the middle of the rope to form an eye portion.

[0063] [Test method] Each rope of the Example and Comparative Examples 1 to 3 was attached to both ends of a 100 kN horizontal tensile tester, and a tensile strength comparison test was conducted once, in which the rope was pulled at a pulling speed of 100 mm per minute, to measure the breaking strength of the Example and Comparative Examples 1 to 3. Specifically, on the driving side of the 100 kN horizontal tensile tester, an eye was attached to a jig with a pin diameter of φ25, and on the fixed, non-driving side of the 100 kN horizontal tensile tester, a drum chuck was attached and the rope was wound around it two times.

[0064] 6 is a table showing the breaking strengths measured by the above-mentioned tensile strength comparison test for the Examples and Comparative Examples 1 to 3. From the results of the above-mentioned test, it was found that Example 1 had the highest breaking strength.

[0065] It can be seen that the rope of Example 1 has a higher breaking strength than the rope of Comparative Example 3. That is, in Comparative Example 3, the spaces between the strands of the rope are pried open and the disassembled strands are inserted, which disrupts the arrangement of the strands on the inserted side of the rope, making the lengths of each strand uneven within the pitch (lay interval), and causing each strand to not bear the load evenly. Also, the rope pitch becomes shorter and the strand angle becomes larger, resulting in a decrease in strength, whereas in Example 1, the arrangement of the strands of the main rope is not disrupted and remains uniform, and the lay interval does not change, preventing a decrease in breaking strength.

[0066] Furthermore, it can be seen that Example 1 has greater strength than the cases where components for fastening the rope, such as wire clips or rope catchers, separate from the rope, are used (Comparative Examples 1 and 2).

[0067] The rope, its manufacturing method, and auxiliary rope of the present invention are not limited to the above-described embodiment or Example 1, and can be modified as appropriate within the scope of the gist of the invention.

[0068] In the above embodiment, the main rope 2 is described as being made of polyester, but this is not limited to this, and the main rope 2 may be made of, for example, nylon, polyethylene, polypropylene, vinylon, metal such as wire, or natural materials (specifically, cotton).

[0069] In the above embodiment, the main rope 2 is described as a so-called coated rope, but this is not limited to this. For example, the main rope 2 may be one in which the outer periphery of the rope body 20 is not coated with the coating portion 21.

[0070] In the above embodiment, the case where the covering portion 21 is made of polyurethane has been described, but this is not limiting, and the covering portion 21 may be made of, for example, vinyl chloride resin. Also, for example, the covering portion 21 may be configured so that it permeates into the inside of the rope body 20 and cannot be peeled off from the rope body 20.

[0071] In the above embodiment, the case where the covering portion 21 covers the entire length of the rope body 20 has been described, but this is not limited to this. For example, the main rope 2 may be one in which the ends of the rope body 20 in the length direction are covered with the covering portion 21.

[0072] In the above embodiment, the auxiliary rope fabricating process includes an eight-strand step and a removal step, and two second strands 3a are removed from the eight-strand rope. However, this is not limiting. For example, in the auxiliary rope fabricating process, Z-twisted strands 30 and S-twisted strands 31 may be formed using fewer strands (e.g., six in total) than the specified number (e.g., eight), and then S-strand sets 300, 301 each including a different number of Z-twisted strands 30 may be constructed, and Z-strand sets 310, 311 each including a different number of S-twisted strands 31 may be constructed. The S-strand sets 300, 301 may be arranged in parallel, and the Z-strand sets 310, 311 may be arranged in parallel, and the S-strand sets 300, 301 and the Z-strand sets 310, 311 may be combined in the S direction and the Z direction, respectively, to construct the auxiliary rope 3.

[0073] 1, the S-strand sets 300, 301 and the Z-strand sets 310, 311 are alternately combined so that an S-strand set 300 consisting of two Z-twisted strands 30 and an S-strand set 301 consisting of one Z-twisted strand 30 are parallel in the radial direction, and a Z-strand set 310 consisting of two S-twisted strands 31 and a Z-strand set 311 consisting of one S-twisted strand 31 are parallel in the radial direction. Also, throughout the entire length, the parallel Z-strand sets 310, 311 are combined at S-side joints C, and the parallel S-strand sets 300, 301 are combined at Z-side joints D.

[0074] As a result, an S-side insertion portion C1 is formed in the S-side joint C as a space corresponding to the number (specifically, one) of S-twisted strands 31 that differ between the combined Z-strand sets 310 and 311. Furthermore, a Z-side insertion portion D1 is formed in the Z-side joint D as a space corresponding to the number (specifically, one) of Z-twisted strands 30 that differ between the combined S-strand sets 300 and 301. Therefore, the S-side insertion portion C1 is formed by an S-twisted strand 31 being missing from the S-side joint C, and the Z-side insertion portion D1 is formed by an Z-twisted strand 30 being missing from the Z-side joint D.

[0075] Therefore, the S-side insertion portion C1 is formed as a space corresponding to the number of the S-twisted strands 31 that differ between the combined Z-strand sets 310, 311, and the Z-side insertion portion D1 is configured as a space corresponding to the number of the Z-twisted strands 30 that differ between the combined S-strand sets 300, 301. Therefore, by performing the auxiliary rope creation process, the auxiliary rope 3 can be constructed and the S-side insertion portion C1 and the Z-side insertion portion D1 can be formed.

[0076] In the above embodiment, the auxiliary rope 3 has been described as having eight strands, but it is not limited to this and may be a rope with various strand counts, such as a four-strand rope or a 16-strand rope. In other words, the auxiliary rope 3 may be configured to have an S-side joint portion C and a Z-side joint portion D.

[0077] In the above embodiment, the Z-direction insertion process was followed by the folding process, and then the S-direction insertion process was performed. However, this is not limiting, and for example, the folding process may be performed in advance to fold the main rope 2 back to form the folded portion 2α and the pair of opposing portions 2a, and then the insertion process may be performed.

[0078] In the above embodiment, a case has been described in which the S-direction insertion process is performed after the Z-direction insertion process, thereby positioning the second opposing portion 2c radially inward (toward the axis of the auxiliary rope 3) from the first opposing portion 2b. However, this is not limited to this, and for example, the S-direction insertion process may be performed first so that the second opposing portion 2c is positioned radially outward from the first opposing portion 2b.

[0079] In the above embodiment, the main rope 2 (specifically, the first opposing portion 2b) is configured to be arranged along the Z-strand set 311 for approximately three turns in the braiding direction of the auxiliary rope 3 (Z direction), and the second opposing portion 2c is configured to be arranged along the S-strand set 301 for approximately three turns in the braiding direction of the auxiliary rope 3 (S direction), but this is not limiting, and for example, the first opposing portion 2b and the second opposing portion 2c may be arranged to be arranged along the Z-strand set 311 and the S-strand set 301 for less than three turns or more than three turns. In this case, it is considered that the first opposing portion 2b and the second opposing portion 2c are inserted into the S-side insertion portion C1 and the Z-side insertion portion D1, respectively, for the number of turns that the first opposing portion 2b and the second opposing portion 2c are arranged along.

[0080] In the above embodiment, as shown in Fig. 4, the case where the eye I is formed on one side of the rope 1 in the longitudinal direction has been described, but for example, the eye I may be formed on both ends of the rope. In this case, it is conceivable that two auxiliary ropes 3 are used and both ends of the main rope 2 in the longitudinal direction are folded back.

[0081] In the above embodiment, the second strands 3a are removed from the entire length of the eight-strand rope in the removal step. However, this is not limiting, and for example, the second strands 3a may be cut at the ends B in the length direction so as not to be removed, and this portion may be left as the excess portion E. In other words, the ends B in the length direction of the auxiliary rope 3 may be eight-stranded, and the middle portion of the auxiliary rope 3 excluding the ends B in the length direction may be six-stranded. This more reliably prevents the auxiliary rope 3 from coming undone at the ends B in the length direction of the auxiliary rope 3.

[0082] In the above embodiment, the case where the diameter of the second strand 3a is approximately the same as the diameter of the main rope 2 has been described, but this is not limiting, and for example, the diameter of the second strand 3a may be larger or smaller than the diameter of the main rope 2. Here, if the diameter of the second strand 3a is smaller than the diameter of the main rope 2, the diameter of the auxiliary rope 3 can be made thinner, which is preferable from the perspective of the aesthetic appearance of the rope.

[0083] In the above embodiment, a space for inserting the main rope 2 is formed by performing an auxiliary rope creation process in which six strands are combined into an eight-strand rope and a removal process in which two strands are removed from the eight-strand rope, but this is not limiting. For example, when forming an eight-strand rope by alternately combining multiple Z-twisted strands 30 and multiple S-twisted strands 31, the strands may be loosely woven to the extent that a space for inserting the main rope 2 is formed between each strand. In this case, the main rope 2 may be inserted into the space formed by the loose weaving, to form the eye I.

[0084] In the above embodiment, the second strands 3a constituting the S-strand groups 300, 301 are Z-twisted strands 30 formed by twisting multiple wires in the Z direction, and the second strands 3a constituting the Z-strand groups 310, 311 are S-twisted strands 31 formed by twisting multiple wires in the S direction. However, this is not limiting. For example, the second strands 3a constituting the S-strand groups 300, 301 may be S-twisted strands 31, and the second strands 3a constituting the Z-strand groups 310, 311 may be Z-twisted strands 30. When the twist direction (S direction, Z direction) when constructing the strands is the same as the braiding direction (S direction, Z direction), additional twisting can be added to stiffen the rope, thereby emphasizing abrasion resistance. Furthermore, the second strands 3a constituting the S-strand groups 300, 301 and the Z-strand groups 310, 311 may be strands 3a with the same twist direction. [Explanation of symbols]

[0085] 1: rope, 2: main rope, 2a: pair of opposing portions, 2b: first opposing portion, 2c: second opposing portion, 2α: folded portion, 20: rope main body, 20a: first strand, 21: covering portion, 3: auxiliary rope, 3a: second strand, 30: Z-twisted strand, 300: S-strand set, 31: S-twisted strand, 310: Z-strand set, A: end portion in the length direction, B: end portion in the length direction, B1: fixing portion, C: S-side joint portion, C1: S-side insertion portion, D: Z-side joint portion, D1: Z-side insertion portion, E: remaining portion, I: eye portion

Claims

1. a main rope including a plurality of first strands; an auxiliary rope comprising a plurality of S-strand sets formed by braiding second strands in the S direction and a plurality of Z-strand sets formed by braiding second strands in the Z direction, the auxiliary rope being shorter than the main rope and being formed by combining the S-strand sets and the Z-strand sets, wherein an S-side joint portion where the plurality of Z-strand sets are combined is formed between the parallel S-strand sets, and a Z-side joint portion where the plurality of S-strand sets are combined is formed between the parallel Z-strand sets; The main rope has a folded portion formed by folding back in the length direction and a pair of opposing portions, The pair of opposing portions includes a first opposing portion that receives a tensile force and a second opposing portion that includes a free end, the S-side coupling portion includes an S-side insertion portion configured as a space into which either the first opposing portion or the second opposing portion is inserted, the Z-side coupling portion includes a Z-side insertion portion configured as a space into which the other of the first opposing portion or the second opposing portion is inserted, A rope in which one of the pair of opposing portions, the first opposing portion or the second opposing portion, is inserted into the S-side insertion portion so as to be aligned with the Z-strand set, and the other of the first opposing portion or the second opposing portion is inserted into the Z-side insertion portion so as to be aligned with the S-strand set, so that the pair of opposing portions is positioned on one end side and the folded portion is positioned on the other end side in the longitudinal direction of the auxiliary rope, whereby the folded portion forms a circular eye portion.

2. the S-side insertion portion is configured in a state in which at least one of the second strands constituting the Z-strand set is missing from the S-side coupling portion, the Z-side insertion portion is configured in a state in which at least one of the second strands constituting the S-strand set is missing from the Z-side coupling portion, 2. The rope according to claim 1, wherein the number of missing second strands in the Z strand set and the S strand set is the same.

3. The rope according to claim 1 or 2, wherein the main rope includes a covering portion that covers the outer periphery of the plurality of first strands.

4. The second strand constituting the S-strand set is a Z-twisted strand formed by twisting wires in the Z direction, 4. The rope according to claim 1, wherein the second strand constituting the Z-strand set is an S-twisted strand formed by twisting wires in an S direction.

5. A method for manufacturing the rope according to claim 1, comprising the steps of: A method for manufacturing a rope, comprising a pulling out step of pulling out the second strand constituting the Z-strand set from the S-side joint portion, thereby configuring the space created by the pulled out second strand as the S-side insertion portion, and pulling out the second strand constituting the S-strand set from the Z-side joint portion, thereby configuring the space created by the pulled out second strand as the Z-side insertion portion.

6. A method for manufacturing the rope according to claim 1, comprising the steps of: An auxiliary rope preparation step of combining the S strand set and the Z strand set to form the auxiliary rope, In the auxiliary rope preparation step, the S strand sets and the Z strand sets are combined so that the number of second strands included in the parallel S strand sets is different from each other and the number of second strands included in the parallel Z strand sets is different from each other, The S-side insertion portion is configured as a space corresponding to the number of the second strands, which differ among the plurality of Z strand sets to be combined, A method for manufacturing a rope, wherein the Z-side insertion portion is configured as a space equal to the number of second strands that differ between the multiple S strand sets that are combined.

7. an insertion step of inserting the first opposing portion into one of the S-side insertion portion and the Z-side insertion portion, and inserting the second opposing portion into the other of the S-side insertion portion and the Z-side insertion portion, A method for manufacturing a rope as described in claim 5 or claim 6, wherein in the insertion process, the first opposing portion is inserted into one of the auxiliary ropes from one end side toward the other end side in the longitudinal direction of the auxiliary rope, and the second opposing portion is inserted into the other of the auxiliary ropes from the other end side toward the one end side in the longitudinal direction of the auxiliary rope.

8. An auxiliary rope is provided with a plurality of S strand sets formed by braiding strands in the S direction and a plurality of Z strand sets formed by braiding strands in the Z direction, and is formed by combining the S strand sets and the Z strand sets, Between the parallel S strand pairs, an S-side joint portion is formed in which a plurality of Z strand pairs are combined, Between the parallel Z strand sets, a Z-side joint portion is formed in which a plurality of the S strand sets are combined, The number of strands is different among the plurality of Z strand sets combined with the S-side joint portion, The number of strands is different among the plurality of S strand sets combined at the Z-side joint portion, In the S-side joint portion, a space corresponding to the number of different strands in the plurality of Z strand sets is configured as an S-side insertion portion into which a main rope configured as a separate body can be inserted, An auxiliary rope in which a space in the Z-side joint portion, equal to the number of different strands in the plurality of S-strand sets, is configured as a Z-side insertion portion into which the main rope can be inserted.

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