Rope splicing method and rope splice structure

Abstract

To provide a rope splicing method capable of increasing mechanical strength of a sewing part.SOLUTION: In a sewing range SR, a sewing yarn part intersecting with a borderline BL at a certain angle (first angle θ1) is pressed from above by another sewing yarn part intersecting with the borderline BL at an angle (supplementary angle of the first angle θ1) different from the first angle by reciprocating a sewing yarn ST in an axial direction X of a rope while making the sewing yarn proceed in zigzag manner across the borderline BL between a folding back part 12 and a rope body 11.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rope splicing method for sewing together rope sections, and to a rope splice structure in which rope sections are sewn together. [Background technology]

[0002] When working at heights, such as pruning trees, or performing construction or electrical work on tall buildings, some ropes have a loop at the end that workers use as a lifeline.

[0003] There are special knots that tie the ends of a rope together to form a loop, but considering the possibility of the loop coming undone, these are unsuitable for ropes used as lifelines. Also, there are splicing methods known as "hand splices," such as a method of unraveling the rope down to the strands that make up the rope at the end, folding the rope back, and then weaving the unraveled strands into the strands of the rope to form a loop, or a method of tapering the end of the rope, folding the rope back, inserting the end into the core of the rope, and weaving a thread into that part to prevent it from slipping out. However, these methods are extremely time-consuming, and the strength of the resulting loop depends on the skill of the person splicing. Furthermore, hand splicing is difficult for ropes with a large number of constituent strands.

[0004] Therefore, a loop has conventionally been formed at the end of a rope by sewing it with a sewing machine. As shown in Fig. 7, this involves folding a rope 110, arranging a folded portion 112, which is the portion of the rope 110 closer to the tip 119 than a peak 113 at the folding, adjacent to a rope body 111, which is the remaining portion of the rope 110 excluding the folded portion 112, and sewing the folded portion 112 and the rope body 111 together with sewing thread at a position away from the peak 113 to form a sewn portion 120, thereby forming a loop 115. The sewing is performed by moving the sewing needle in one direction along the axial direction X of the rope while alternating between the points where the sewing needle pierces the folded portion 112 and the rope body 111 to entangle the upper thread and the lower thread.

[0005] In a conventional rope 110 in which the loop 115 is formed by sewing in this manner, it was necessary to increase the length of the sewn portion 120 in the rope axial direction X in order to sufficiently resist the tensile force acting to separate the rope body 111 and the turned-back portion 112 from each other. However, increasing the length of the sewn portion 120 poses a problem in that the rope 110 in the vicinity of the sewn portion 120 becomes less flexible.

[0006] For example, when pruning trees, if a lifeline rope is directly hooked around a tree branch or the crotch of a tree, friction would damage both the bark and the rope. Therefore, a ring or pulley is hung from the tree branch or the like using a separate rope, and the lifeline rope is passed through the hanging ring or pulley. When retrieving the lifeline rope from the ground after work is completed, the entire rope 110 must pass through the ring or pulley to be released. However, if the length of the sewn portion 120 used to form the loop 115 is large, and the rope becomes less flexible near the sewn portion 120, that portion is difficult to bend and cannot be passed through the ring or pulley. This creates the problem of being unable to retrieve the lifeline rope from a location away from the ring or pulley, such as the ground, after work at height is completed.

[0007] In addition, a rope in which the rope body and the turned-up portion are sewn together as described above is also subject to shear forces, i.e., forces that cause the rope body and the turned-up portion to slide relative to each other in opposite directions along the rope's axis. The conventional rope 110 described with reference to FIG. 7 also has the problem of insufficient strength against such shear forces. For this reason, there has long been a demand for increased mechanical strength at the sewn portion when forming a loop at the end of a rope. This situation is true not only for splices at the end but also for splices for forming loops in the middle of a rope.

[0008] In addition, rope splices are also used to connect the ends of two ropes together to increase the overall length of the rope, and in this case, the splice must be able to withstand tensile and shear forces without increasing the length of the sewn portion. Summary of the Invention [Problem to be solved by the invention]

[0009] In view of the above-mentioned circumstances, an object of the present invention is to provide a rope splicing method that can increase the mechanical strength of the sewn portion when sewing together portions of the rope, and a rope splice structure formed by the rope splicing method. [Means for solving the problem]

[0010] In order to solve the above problems, the rope splicing method according to the present invention (hereinafter sometimes simply referred to as the "splice method") comprises: "A rope splicing method in which a first rope portion and a second rope portion are adjacent to each other and sewn together with a sewing thread in a sewing range including a boundary line between the first rope portion and the second rope portion, In the sewing range, the sewing thread is advanced in a zigzag pattern across the boundary line while being moved back and forth in the axial direction of the rope, so that a portion of the sewing thread that intersects the boundary line at a certain angle is held down from above by another portion of the sewing thread that intersects the boundary line at a different angle from the first portion of the sewing thread.

[0011] The "axial direction of the rope" is the axial direction of the rope in the portion where the first rope portion and the second rope portion are adjacent to each other, and is a direction parallel to the "boundary line" between the first rope portion and the second rope portion. Hereinafter, when simply referring to the "axial direction," it refers to the "axial direction of the rope."

[0012] When the first rope portion and the second rope portion are sewn together with a sewing thread, even if there was originally a single sewing thread, many linear elements that are parts of the sewing thread are visible lined up in the "sewn area." The "sewing thread portion" refers to the part of the sewing thread that is visible as a line in this way in the sewing area.

[0013] According to this configuration, in order to sew the first rope portion and the second rope portion together in a zigzag pattern with the sewing thread, the sewing thread is reciprocated in the axial direction of the rope, so that the sewing thread portion placed later crosses the sewing thread portion placed earlier and presses it down from above.

[0014] Therefore, although the structure is a "linear" structure of thread, the multiple sewing thread portions intertwine with each other, creating a "planar" structure like cloth, which sews the first rope portion and the second rope portion together. Therefore, the mechanical strength of the sewn portion can be increased without increasing the length of the sewn portion in the axial direction.

[0015] In addition, the sewing area includes a sewing thread portion that intersects the boundary line at a certain angle and another sewing thread portion that intersects the boundary line at a different angle from the first sewing thread portion, so that the rope can not only resist a tensile force that acts to separate the first rope portion and the second rope portion, but also sufficiently resist a shear force that acts to slide the first rope portion and the second rope portion relative to each other in opposite axial directions.

[0016] In addition to the above configuration, the rope splicing method according to the present invention further comprises: "In the folded rope, the folded portion which is the portion on the tip side of the folded mountain portion is the first rope portion, The rope main body, which is the remaining part of the folded rope excluding the folded portion, is the second rope part, The sewing area may be positioned away from the peak of the folded portion to form a loop.

[0017] This is a method of splicing rope to form a loop.

[0018] Next, the splice structure of the rope according to the present invention (hereinafter, sometimes simply referred to as "splice structure") is as follows: "A splice structure of a rope in which a first rope portion and a second rope portion are adjacent to each other and are sewn together with a sewing thread in a sewing area including a boundary line between the first rope portion and the second rope portion, In the sewing area, the sewing thread is arranged in a zigzag pattern so as to straddle the boundary line, and a portion of the sewing thread that intersects the boundary line at a certain angle is held down from above by another portion of the sewing thread that intersects the boundary line at a different angle from the first portion of the sewing thread.

[0019] This is the splice structure formed by the splicing method described above. [Effects of the Invention]

[0020] As described above, according to the present invention, it is possible to provide a rope splicing method that can increase the mechanical strength of the sewn portion when sewing together portions of the rope, and a rope splice structure formed by the rope splicing method. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a plan view of a main part illustrating a splice structure formed by the splicing method of the first embodiment. FIG. [Figure 2] 1A to 1C are diagrams illustrating a splicing method according to a first embodiment. [Figure 3] Continuing from FIG. 2, this is a diagram illustrating the splicing method of the first embodiment. [Figure 4] FIG. 10 is a plan view of a main part illustrating a splice structure formed by a splicing method according to a second embodiment. [Figure 5] 10A to 10C are diagrams illustrating a splicing method according to a second embodiment. [Figure 6] 5A to 5C are diagrams illustrating a splicing method according to a second embodiment. [Figure 7] FIG. 1 is a plan view of a main part illustrating a splice structure formed by a conventional splicing method. DETAILED DESCRIPTION OF THE INVENTION

[0022] A splicing method according to one embodiment of the present invention and a splice structure formed by this splicing method will be described below with reference to the drawings. The splicing method of this embodiment involves folding back a rope 10, aligning a folded back portion 12, which is the portion of the rope 10 closer to the tip 19 than the crest 13 of the folded back portion, with a rope body 11, which is the remaining portion of the rope 10 excluding the folded back portion 12, and sewing the folded back portion 12 and the rope body 11 together with sewing thread ST in a sewing range SR away from the crest 13, thereby forming a loop 15. The sewing with sewing thread ST is performed using a sewing machine. The "folded back portion 12" corresponds to the "first rope portion" of the present invention, and the "rope body 11" corresponds to the "second rope portion" of the present invention.

[0023] Here, the material of the "rope" is not particularly limited as long as it can be sewn with a sewing machine, and examples thereof include ropes made from synthetic fibers such as nylon, polypropylene, polyethylene, vinylon, and polyester, ropes made from natural fibers such as Manila hemp and sisal hemp, ropes made from carbon fiber and glass fiber, and ropes made from metals such as carbon steel and stainless steel. Furthermore, the material of the "sewing thread" is not particularly limited, and examples thereof include nylon thread, polyester thread, silk thread, cotton thread, wool thread, cotton-polyester blend thread, and stainless steel thread.

[0024] First, a splicing method and a splice structure according to a first embodiment will be described with reference to FIGS.

[0025] If the boundary line between the adjacent folded-back portions 12 and the rope main body 11 is defined as the "boundary line BL," the sewing area SR is a rectangle that is symmetrical with respect to the boundary line BL. The end edge of the sewing area SR on the mountain portion 13 side is defined as EL, and the end edge opposite the end edge EL (the end edge on the tip 19 side of the folded-back rope 10) is defined as EB. Furthermore, of the pair of end edges parallel to the boundary line BL in the sewing area SR, the end edge on the rope main body 11 is defined as E1, and the end edge on the folded-back portion 12 is defined as E2.

[0026] The sewing procedure in the splicing method of the first embodiment will be explained by moving the point where the sewing needle pierces and intertwines the upper thread and bobbin thread. First, as shown in Figure 2(a), one of the four corners of the sewing area SR is set as the starting point S. Here, the example shows a case where the intersection of end side E2 and end side EB is set as the starting point S.

[0027] If the next point P1 from the starting point S is on the end edge E1 and away from the end edge EB, the sewing thread ST intersects with the boundary line BL at a first angle, which is an angle other than a right angle. Here, of the two angles formed by the intersection of the sewing thread ST and the boundary line BL, the angle closer to the end edge EL than the sewing thread ST and closer to the end edge E2 than the boundary line BL is referred to as the first angle θ1. Similarly, in the following description, of the two angles formed by the intersection of the sewing thread ST and the boundary line BL, the angle closer to the end edge EL than the sewing thread ST and closer to the end edge E2 than the boundary line BL will be referred to as the angle between the sewing thread ST and the boundary line BL.

[0028] The next point P2 is a point on end edge E2, and the angle that the sewing thread ST between P1 and P2 makes with the boundary line BL is the supplementary angle of the first angle θ1 (180 degrees - θ1). The next point P3 is a point on end edge E1, and the angle that the sewing thread ST between P2 and P3 makes with the boundary line BL is the first angle θ1. As a result, the sewing thread ST between P2 and P3 is parallel to the sewing thread ST between S and P1. In this way, the point where the sewing needle is inserted is moved alternately between a point on end edge E2 and a point on end edge E1, and the point is repeatedly moved so that when moving from a point on end edge E2 to a point on end edge E1, the angle that the sewing thread ST makes with the boundary line BL is the first angle θ1, and when moving from a point on end edge E1 to a point on end edge E2, the angle that the sewing thread ST makes with the boundary line BL is the supplementary angle of the first angle θ1. By this movement, the point moves from the edge EB where the starting point S is located to the opposite edge EL. This movement is called "forward movement."

[0029] When the point approaches the end side EL to a certain extent, the angle that the sewing thread ST makes with the boundary line BL when moving to the next point is set to a second right angle θ2. Here, the angle that the sewing thread ST makes with the boundary line BL when moving from point P3 on the end side E1 to point P4 on the end side E2 is shown as an example, but the angle that the sewing thread ST makes with the boundary line BL may also be set to the second right angle θ2 when moving from a point on the end side E2 to a point on the end side E1.

[0030] 2(b), the needle is moved from point P4 on edge E2 to point P5 on edge E1, to point P6 on edge E2, and finally to point P7 on edge E1. The needle is then moved so that when it moves from the point on edge E2 to the point on edge E1, the angle that the thread ST makes with boundary line BL is the supplementary angle of the first angle θ1, and when it moves from the point on edge E1 to the point on edge E2, the angle that the thread ST makes with boundary line BL is the first angle θ1. This movement causes the needle to move from a position close to edge EL toward edge EB, where the starting point S is located. This movement is called the "return movement."

[0031] By doing this, the sewing thread ST that sewed the rope body 11 and the turned-back portion 12 together as the sewing needle pierces the rope body 11 and the turned-back portion 12 moves forward is pressed down from above by the sewing thread ST that sewed the rope body 11 and the turned-back portion 12 together as the sewing needle moves back. For example, the sewing thread ST between S and P1 (the portion of the sewing thread that intersects with the boundary line BL at the first angle θ1) is pressed down from above by the sewing thread ST between P6 and P7 (the portion of the sewing thread that intersects with the boundary line BL at the supplementary angle of the first angle θ1). Furthermore, the sewing thread ST between P1 and P2 (the sewing thread portion intersecting with the boundary line BL at the supplementary angle of the first angle θ1) is pressed down from above by the sewing thread ST between P5 and P6 (the sewing thread portion intersecting with the boundary line BL at the first angle θ1), and the sewing thread ST between P2 and P3 (the sewing thread portion intersecting with the boundary line BL at the first angle θ1) is pressed down from above by the sewing thread ST between P4 and P5 (the sewing thread portion intersecting with the boundary line BL at the supplementary angle of the first angle θ1). The state of the two sewing thread portions in these combinations corresponds to the "sewing thread portion intersecting with the boundary line BL at a certain angle is pressed down from above by another sewing thread portion intersecting with the boundary line BL at a different angle" of the present invention.

[0032] When the point reaches a point opposite the starting point S across the boundary line BL (in the illustrated example, the intersection P7 between the end side E1 and the end side EB), it then moves to point P8 on the end side E2, which is the end side on which the starting point S is located. At this time, the angle that the sewing thread ST makes with the boundary line BL is set to a third angle θ3 that is smaller than a right angle. The closer the third angle θ3 is to a right angle, the denser the sewing thread ST can be arranged by the subsequent movement of the point. For this reason, it is desirable that the third angle θ3 be greater than or equal to 80 degrees and less than 90 degrees.

[0033] 2(a), the point where the sewing needle is inserted is moved alternately between a point on end edge E2 and a point on end edge E1, and the point is moved forward so that the angle the sewing thread ST makes with the boundary line BL is the first angle θ1 when moving from the point on end edge E2 to the point on end edge E1, and the angle the sewing thread ST makes with the boundary line BL is the supplementary angle of the first angle θ1 when moving from the point on end edge E1 to the point on end edge E2.The point is then moved to the opposite end edge (end edge E2 in this case) so that the second angle θ2 the sewing thread ST makes with the boundary line BL becomes a right angle, and then, as described above with reference to FIG. 2(b), the point is moved backward so that the angle the sewing thread ST makes with the boundary line BL is the supplementary angle of the first angle θ1 when moving from the point on end edge E2 to the point on end edge E1, and the angle the sewing thread ST makes with the boundary line BL is the first angle θ1 when moving from the point on end edge E1 to the point on end edge E2. Furthermore, the point is moved onto the edge (edge E2 in this case) on the side where the start point S is located so that the angle between the sewing thread ST and the boundary line BL becomes the third angle θ3. Thereafter, the point is repeatedly moved forward and backward in this manner.

[0034] In other words, after moving the point forward, the movement direction is switched from forward to backward by moving the point so that the second angle θ2 that the sewing thread ST makes with the boundary line BL becomes a right angle, and after moving the point backward, the movement direction is switched from backward to forward by moving the point so that the angle that the sewing thread ST makes with the boundary line BL becomes a third angle θ3.

[0035] In this way, by repeating the forward and backward movements of the point, the sewing thread ST is advanced in a zigzag manner so as to straddle the boundary line BL, and the sewing thread ST is reciprocated in the axial direction X of the rope 10, and as shown in Figures 2(a) to 2(c) and 3(a) to 3(c), the sewing thread ST gradually becomes denser, and a sewn portion 21 is formed where the rope body 11 and the folded-back portion 12 are sewn together with the sewing thread ST within the sewing range SR. Since the end side EL on the side of the peak portion 13 of the sewing range SR is separated from the peak portion 13, the formation of the sewn portion 21 forms a loop 15 between the end side EL and the peak portion 13.

[0036] In the sewn portion 21, there are many portions where a sewing thread portion intersecting the boundary line BL at a first angle θ1 is held down from above by other sewing thread portions that intersect with the boundary line BL at a supplementary angle to the first angle θ1, portions where a sewing thread portion intersecting with the boundary line BL at the supplementary angle of the first angle θ1 is held down from above by other sewing thread portions that intersect with the boundary line BL at the first angle θ1, portions where a sewing thread portion intersecting with the boundary line BL at a second angle θ2 that is a right angle is held down from above by other sewing thread portions that intersect with the boundary line BL at the first angle θ1 or a supplementary angle to the first angle θ1, and portions where a sewing thread portion intersecting with the boundary line BL at the first angle θ1 or a supplementary angle to the first angle θ1 is held down from above by other sewing thread portions that intersect with the boundary line BL at a third angle θ3. In other words, in the sewn portion 21, there are many portions where a sewing thread portion intersecting with the boundary line BL at a certain angle is held down from above by other sewing thread portions that intersect with the boundary line BL at a different angle from the first sewing thread portion.

[0037] The splice structure shown in Fig. 1 is formed by the splicing method of the first embodiment as described above. That is, in the splice structure of the rope 10, the folded-back portion 12, which is the portion of the folded-back peak 13 closer to the tip 19, and the rope body 11, which is the remaining portion of the rope 10 excluding the folded-back portion 12, are adjacent to each other, and the folded-back portion 12 and the rope body 11 are sewn together with the sewing thread ST in a sewing range SR away from the peak 13, thereby forming a loop 15. In the sewing range SR, the sewing thread ST is arranged in a zigzag pattern so as to straddle the boundary line BL between the folded-back portion 12 and the rope body 11, and a portion of the sewing thread that intersects with the boundary line BL at a certain angle is held down from above by another portion of the sewing thread that intersects with the boundary line BL at a different angle from the first portion of the sewing thread.

[0038] Next, a splicing method and a splice structure according to a second embodiment will be described with reference to Figures 4 to 6. The same components as those in the first embodiment are given the same reference numerals, and detailed description thereof will be omitted.

[0039] The difference between the splicing method of the second embodiment and the splicing method of the first embodiment is the way in which the point at which the sewing needle is inserted is moved when switching from forward movement to reverse movement and when switching from reverse movement to forward movement.

[0040] The second embodiment is similar to the first embodiment in that a start point S is set at one of the four corners of the sewing range SR, the point is moved so that, during the forward movement of the point, the angle that the sewing thread ST makes with the boundary line BL is a first angle θ1 when moving from a point on end side E2 to a point on end side E1, and the angle that the sewing thread ST makes with the boundary line BL is a supplementary angle of the first angle θ1 when moving from a point on end side E1 to a point on end side E2, and the point is moved so that, during the backward movement of the point, the angle that the sewing thread ST makes with the boundary line BL is a supplementary angle of the first angle θ1 when moving from a point on end side E2 to a point on end side E1, and the angle that the sewing thread ST makes with the boundary line BL is the first angle θ1 when moving from a point on end side E1 to a point on end side E2. Note that the "angle that the sewing thread ST makes with the boundary line BL" includes the "angle that an extension of the sewing thread ST makes with an extension of the boundary line BL."

[0041] In the splicing method of the second embodiment, when a certain point reaches either of the end edges EL, EB in the axial direction X of the rope 10 in the sewing range SR, the point is moved so that the angle between the sewing thread ST from the previous point to that point and the sewing thread ST from that point to the next point is a right angle, thereby switching from forward movement to backward movement and vice versa.

[0042] Specifically, as shown in Figure 5(a), the movement of the point starts from the starting point S, and when the point is moved forward, it passes through points P11, P12, and P13 and reaches the edge HL at point P14. The point is then moved so that the angle formed by the sewing thread ST between point P14 and the previous point P3 and the sewing thread ST between point P14 and the next point P15 is a right angle. As a result, point P15 becomes a point on edge E2, and the point can be moved backward from point P15 onwards. In other words, the direction of movement can be switched from forward movement to point P13 to backward movement from point P15 onwards.

[0043] In the second embodiment, the relationship between the size of the sewing range SR and the first angle θ1 is set so that when the point reaches either of the end edges EL, EB (here, the end edge EL) after the first forward movement, it does not coincide with one of the two end points of that end edge.

[0044] 5(b), when point P19 reaches the edge HB as the point moves backward, the point is moved so that the angle formed by the sewing thread ST between P19 and the previous point P18 and the sewing thread ST between P19 and the next point P20 becomes a right angle. This allows the direction of movement to be switched from backward movement to point P18 to forward movement after point P20.

[0045] When the point reaches the edge HL or edge HB as it moves forward or backward, and it becomes the end point of that edge, the point starts moving forward or backward from the end point on the opposite side of the same edge without switching the movement direction as described above. Also, if the end point on the opposite side of the same edge is the starting point S, the point starts moving forward or backward from the adjacent point.

[0046] In this way, by switching the movement of the point from forward movement to backward movement and from backward movement to forward movement while reciprocating the point in the axial direction X of the rope 10, the sewing thread ST gradually becomes denser, and a sewn portion 22 is formed where the rope body 11 and the turned-back portion 12 are sewn together with the sewing thread ST within the sewing range SR, as shown in Figures 5(a) to 5(c) and 6(a) to 6(c). The end edge EL on the side of the crest 13 of the sewing range SR is separated from the crest 13, and therefore a loop 15 is formed between the end edge EL and the crest 13 by the formation of the sewn portion 22.

[0047] In the sewn portion 22, there are many portions where a portion of the sewing thread that intersects with the boundary line BL at the first angle θ1 is pressed down from above by another portion of the sewing thread that intersects with the boundary line BL at a supplementary angle to the first angle θ1, and there are many portions where a portion of the sewing thread that intersects with the boundary line BL at the supplementary angle to the first angle θ1 is pressed down from above by another portion of the sewing thread that intersects with the boundary line BL at the first angle θ1. In other words, in the sewn portion 22, there are many portions where a portion of the sewing thread that intersects with the boundary line BL at a certain angle is pressed down from above by another portion of the sewing thread that intersects with the boundary line BL at a different angle from the original portion of the sewing thread.

[0048] The splice structure shown in Fig. 4 is formed by the splicing method of the second embodiment as described above. That is, in the splice structure of the rope 10, the folded-back portion 12, which is the portion of the folded-back peak 13 closer to the tip 19, and the rope body 11, which is the remaining portion of the rope 10 excluding the folded-back portion 12, are adjacent to each other, and the folded-back portion 12 and the rope body 11 are sewn together with the sewing thread ST in a sewing range SR away from the peak 13, thereby forming a loop 15. In the sewing range SR, the sewing thread ST is arranged in a zigzag pattern so as to straddle the boundary line BL between the folded-back portion 12 and the rope body 11, and a portion of the sewing thread that intersects with the boundary line BL at a certain angle is held down from above by another portion of the sewing thread that intersects with the boundary line BL at a different angle from the first portion of the sewing thread.

[0049] As described above, according to the first and second embodiments, in order to sew the rope body 11 and the folded-back portion 12 together in a zigzag pattern with the sewing thread ST, the sewing needle is moved back and forth in the axial direction X. As a result, the sewing thread portion placed later crosses the sewing thread portion placed earlier and presses it down from above. Moreover, by performing the reciprocating motion multiple times, many such crossing portions are formed, and a sewing thread portion that is pressing down another sewing thread portion from above is in turn pressed down from above by another sewing thread portion, so that many sewing thread portions become entangled with each other.

[0050] Therefore, although the structure is a "linear" structure of thread, the multiple sewing thread portions are intertwined with each other to sew together the rope body 11 and the folded-back portion 12 as a "planar" structure like cloth. Therefore, the mechanical strength of the sewn portions 21, 22 can be increased without increasing the length of the sewn portions 21, 22 in the axial direction X.

[0051] Furthermore, the sewn portions 21, 22 have sewing thread portions that intersect with the boundary line BL at a first angle θ1 that is not a right angle, and sewing thread portions that intersect with the boundary line BL at a supplementary angle to the first angle θ1. Therefore, in addition to being able to resist the tensile force that acts to separate the rope body 11 and the turned-back portion 12, they can also sufficiently resist the shear force that acts to relatively slide the rope body 11 and the turned-back portion 12 in opposite directions in the axial direction X.

[0052] Furthermore, in the first embodiment, the third angle θ3 is set to be an angle smaller than a right angle, and in the second embodiment, the relationship between the size of the sewing range SR and the first angle θ1 is set so that the point reached at the end side HL or end side HB (end side EL in the illustrated example) after the first forward movement does not coincide with the end point of that end side, thereby preventing the sewing thread portions from overlapping vertically even with repeated back-and-forth movements. Therefore, even if the point moves back and forth many times, the sewn portions 21, 22 do not become bulky, and the mechanical strength of the sewn portions 21, 22 can be increased.

[0053] 7, adjacent sewing thread portions do not intersect with each other and all sewing thread portions are aligned in the same direction, so if one portion breaks, there is a risk that the other portions will also come undone. In contrast, in the first and second embodiments, many sewing thread portions that intersect with the boundary line BL at different angles are entangled with each other, so even if one portion breaks, there is an advantage that this is unlikely to lead to breakage of other portions.

[0054] Additionally, in the first embodiment, sewing thread portions that intersect with the boundary line BL at a right angle (second angle θ2) are lined up on the end side EL side, which is the loop 15 side, and sewing thread portions that intersect with the boundary line BL at an angle close to a right angle (third angle θ3) are lined up on the end side EB side, which is the tip 19 side of the rope 10. Therefore, the force that resists the tensile force that acts to separate the rope body 11 and the turned-back portion 12 is stronger. For example, when a force that pushes the loop 15 apart acts when something is inserted through the loop 15, or when a force that pulls the tip 19 of the rope 10 away from the rope body 11 acts, the rope 10 can sufficiently resist these forces.

[0055] The present invention has been described above by citing preferred embodiments, but the present invention is not limited to the above embodiments, and various improvements and design changes are possible as described below, without departing from the spirit of the present invention.

[0056] For example, in the above embodiment, the starting point S in the sewing procedure is the intersection of the end side E2 and the end side EB. However, the starting point may be the intersection of the end side E1 and the end side EB. In this case, the sewing procedure shown in FIGS. 2(a) to 3(c) and 5(a) to 6(c) is inverted vertically in the drawings. Furthermore, the starting point may be the intersection of the end side E2 and the end side EL. In this case, the sewing procedure shown in FIGS. 2(a) to 3(c) and 5(a) to 6(c) is inverted horizontally in the drawings. Furthermore, the starting point may be the intersection of the end side E1 and the end side EL. In this case, the sewing procedure shown in FIGS. 2(a) to 3(c) and 5(a) to 6(c) is inverted vertically and horizontally in the drawings.

[0057] In addition, in the above embodiment, a splice for forming a loop at the end of a rope is exemplified, but the present invention can also be applied to forming a loop at an intermediate position in the rope other than the end.

[0058] Furthermore, the present invention can also be applied to connecting two or more ropes to increase the overall length of a loop. In this case, when focusing on one of the sections where one rope is connected to another rope, the end of one rope corresponds to the "first rope section," and the end of the other rope sewn adjacent to the first rope section corresponds to the "second rope section." [Explanation of symbols]

[0059] 10 Rope 11 Rope body (second rope part) 12 Folded section (first rope section) 13 Mountain section (return mountain section) 15 Loop SR sewing range ST Sewing Thread BL Boundary line (boundary line between the rope body and the folded part) X-axis direction (rope axis direction)

Claims

1. A rope splicing method comprising: placing a first rope portion and a second rope portion adjacent to each other; and sewing the first rope portion and the second rope portion together with a sewing thread in a sewing range including a boundary line between the first rope portion and the second rope portion; In the sewing range, the sewing thread is advanced in a zigzag manner across the boundary line while being reciprocated in the axial direction of the rope, so that a portion of the sewing thread intersecting the boundary line at a certain angle is pressed down from above by another portion of the sewing thread intersecting the boundary line at a different angle from the portion of the sewing thread. A method for splicing ropes, comprising:

2. In the folded rope, the folded portion which is the portion on the tip side of the folded mountain portion is defined as the first rope portion, The rope main body, which is the remaining part of the folded rope excluding the folded portion, is the second rope part, The sewing area is positioned away from the folded peak to form a loop.

2. The method of claim 1, wherein the rope is spliced.

3. A rope splice structure in which a first rope portion and a second rope portion are adjacent to each other and are sewn together with a sewing thread in a sewing range including a boundary line between the first rope portion and the second rope portion, In the sewing area, the sewing thread is arranged in a zigzag pattern so as to straddle the boundary line, and a portion of the sewing thread that intersects with the boundary line at a certain angle is held down from above by another portion of the sewing thread that intersects with the boundary line at a different angle from the first portion of the sewing thread. A rope splice structure characterized by:

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