JPH0441200Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a multilayer rope with treated ends, and more specifically, a coating layer and a protective layer are provided around the outer periphery of a core formed by braided aromatic polyamide fibers. This invention relates to a multilayer rope formed by sequentially laminating layers, the ends of which are treated with an adhesive.

[Prior art]

Conventionally, wire ropes made by twisting many thin steel wires have often been used as tension ropes for tensioning center nets of tennis and volleyball courts. This wire rope is made by changing the number of twisted steel wires.
It is used in large quantities because it can be made into ropes of various diameters depending on the purpose, and it has high tensile strength and excellent bending resistance.

[Problem that the invention attempts to solve]

However, since wire rope is made of a large number of thin steel wires twisted together, it is susceptible to rust and has problems with durability. In addition, since the weight per tensile strength is relatively large, in the case of a long-span tension structure, a rope with a considerably large diameter must be used to support the weight.

In addition, wire ropes generally have poor flexibility, making them difficult to handle. Furthermore, during use, the steel wire near the winding section of the tensioning winch breaks in places, causing cracks and causing injury to hands. There were also operational risks.

In addition, a waterproof insulating rope with a multilayer structure in which a core fiber rope with high strength properties such as polyamide fiber is coated with an outer layer of resin through a thin fiber layer was proposed in Japanese Utility Model Application Publication No. 61-206697. It is proposed as. Furthermore, as a fiber rope described in JP-A-58-207806, a middle layer of braided fibers is provided around the outer periphery of a core made of a twisted body of fibers, and a covering layer of molten thermofusible resin is provided around the outer periphery of the core. A multilayer rope having a jacket layer has been proposed in which a braid of heat-shrinkable resin fibers is provided around the outer periphery of the jacket layer, and the jacket layer is shrunk by being embedded between the fibers.

Although it is conceivable to use such a multilayer rope as a tensioning rope to stretch a center net of a tennis or volleyball court, it cannot be attached as is in the same manner as a conventional wire rope. According to the inventor's experiments, when the end of such a multilayer rope is formed into an annular shape with a clamp and the annular part is stretched by applying an external force, a gap between the core wire, the intermediate tissue, and the outer skin is created. It was found that misalignment occurred, resulting in the clamp coming off.

Therefore, the present invention solves the disadvantages of multilayer ropes and the problems of wire ropes, and provides a rope that is durable, has high tensile strength, is light in weight, has excellent flexibility and operability, and has a highly safe end treatment. The purpose is to provide ropes that are

[Means for solving problems]

The present invention consists of sequentially laminating a covering layer made of a braided flex-resistant fiber and a protective layer made of a flexible synthetic resin film on the outer periphery of a core made of a braided aromatic polyamide fiber. A multi-layered rope comprising: at the end of the rope, each of the coating layer 3 sufficiently exposed in the longitudinal direction from the tip of the protective layer and the core body sufficiently exposed in the longitudinal direction from the tip of the coating layer 3. An exposed portion is formed, and each exposed portion at the end portion and the exposed portion and the protective layer are all continuously adhesively fixed together with an adhesive to form a joist portion that is thicker than the outer diameter of the protective layer. be done.
At the same time, a portion relatively close to the joist portion 7 is folded back and bent, whereby the pair of portions close to each other are fastened and fixed to each other by a clamp. An annular attachment portion is formed on one side of the clamp, and the joist portion is formed relatively adjacent to the clamp, so that an external force is applied to the attachment portion.

Next, the present invention will be further explained.

The aromatic polyamide fibers used in the core of the present invention are so-called aramid fibers, and are commercially available, for example, under the trade name Kevlar from DuPont, or under the trade name Technora from Teijin. In order to make a core body from this aromatic polyamide fiber, a bundle of filaments of the fiber or a plurality of filaments twisted together to form a filament are used, and a relatively loose braid of a desired diameter is produced using a normal braid manufacturing method. All you have to do is finish it. The diameter of the filament bundle or filament that makes up the braid is
Using 1500 denier, you only need 32 pieces to have a strength of 1000 kg.

A core formed by a braid of aromatic polyamide fibers has a very high tensile strength, and the tensile strength per unit weight is orders of magnitude higher than that of a wire rope.

Next, a covering layer for laminating and covering the outer periphery of the core is formed of a relatively dense braid of bend-resistant fibers. The core formed by braided aromatic polyamide fibers has tensile strength,
That is, although its strength against axial tensile stress is very high, it generally has a weakness in that it lacks durability against bending stress such as bending. Therefore, by forming a covering layer made of braided flex-resistant fibers around the outer periphery of the core, such weak points of the core are covered, and both the core and the covering layer have high tensile strength and bending strength, and a balanced You will get a rope that has been

In the present invention, the bend-resistant fibers are braided fibers that sufficiently cover the weak points of the core and prevent damage to the core due to bending when used as a rope. means a fiber with sufficient bending resistance. Examples of such flexible fibers include polyester,
Synthetic fibers such as polyethylene, polypropylene, or aliphatic polyamides such as nylon 6 and nylon 66, or natural fibers such as linen, cotton, etc. can be used.

In order to form the covering layer, a bundle of monofilament of bend-resistant fibers or a thread-like product twisted together may be braided around the outer periphery of the core body using a conventional method.

Incidentally, the core body formed by the braided cord of aromatic polyamide fibers has a problem that it is relatively weak against external friction, but this problem can be solved at the same time by providing the above-mentioned covering layer. Also,
Since the aromatic polyamide fiber itself is expensive, it is not preferable to make the diameter of the core larger than the required strength. However, by providing the coating layer, even if the diameter of the core body is small, the diameter of the rope as a whole can be increased, so that the handleability of the rope can be improved.

Furthermore, this coating layer also has the effect of blocking ultraviolet rays from the outside and improving the durability of the aromatic polyamide fiber, which is relatively sensitive to ultraviolet rays.

Next, the protective layer that is further laminated on the outer periphery of the covering layer has the effect of bringing the braids of the core body and the covering layer into close contact with each other and integrating them as much as possible, thereby reducing the elongation of both. Separation due to differences can be effectively suppressed. It also functions as a protective layer against damage caused by external forces to the braid and water penetration, and has the effect of improving weather resistance.

The protective layer for this purpose is formed from a durable flexible synthetic resin film without impairing the flexibility of the rope, such as flexible polyethylene, polypropylene, nylon, polyester, etc.
Membranes such as polyvinyl chloride can be used.
Further, an inorganic filler such as glass fiber may be included in this protective layer for reinforcement.

As a method for forming a protective layer on the outer periphery of the coating layer, for example, a laminate in which the core body is coated with the coating layer is run at a constant speed, and the molten synthetic resin for forming the protective layer is poured from around the laminate into a ring-shaped die. There is a method of coating by extrusion. The ring-shaped die used in this method has a laminate passage hole in its center, and the laminate passed through the passage hole is coated with a resin at its outlet. Another method is to push a laminate in which a core body and a covering layer are integrated into a heat-shrinkable tube made of a heat-shrinkable synthetic resin material, and then heat the tube from the outside to shrink the tube. There is a way to get it in close contact with your body.

In this way, a multilayer rope having a three-layer structure in which the covering material and the protective layer are sequentially laminated around the outer periphery of the core can be manufactured. The braided aromatic polyester fibers forming the core are generally not very compatible with the protective layer, which has a smooth, membrane-like inner surface. Therefore, if a protective layer is directly laminated on the outer periphery without interposing a covering layer in between, the two tend to separate, and it is often impossible to obtain balanced strength as a rope. From this point of view as well, laminating the covering layer has great significance.

Note that the multilayer rope of the present invention is not limited to a single protective layer, but can also have two or more layers of the same or different flexible synthetic resin films laminated thereon.

Next, in the multilayer rope manufactured in this way, at least one of the core, the covering layer, and the protection layer is bonded more firmly, and in order to more effectively suppress mutual displacement caused by external stress. The ends are treated with adhesive. It has been found that by carrying out this terminal treatment, the resistance to separation due to tensile stress between the protective layer and the braid forming the internal core and coating layer is significantly improved compared to the case without treatment.

To treat the end of a multilayer rope, first, the protective layer at the end of the multilayer rope is coated with an appropriate length, e.g.
The core body and the coating layer are peeled off by about 30 mm to form exposed portions at the ends of the laminated portions. Then, these exposed parts and the outer periphery of the protective layer which is peeled off at the end part are integrally bonded and fixed with an adhesive such as an epoxy resin.

In this case, the adhesive fixing part is a joist part that is raised so as to be thicker than the outer diameter of the protective layer.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is an enlarged partial perspective view of a structural example of a multilayer rope according to the present invention. multilayer rope 1
The core body 2 is formed by a loose braid of filaments made of monofilament bundles of aromatic polyamide fibers.
, a covering layer 3 made of similar dense braids of bend-resistant fibers laminated on the outer periphery of the core body 2, and a flexible synthetic resin film laminated closely on the outer periphery of the covering layer 3. It is composed of three layers including a protective layer 4.

Note that the multilayer rope shown in FIG. 1 is in a state before its end is treated, and in order to facilitate understanding of its structure, the core body 2, which constitutes three layers,
Each layer of the covering layer 3 and the protective layer 4 is shown cut into steps.

FIG. 2 is a partial perspective view showing an example of a multilayer rope with end treatment. At the end portion 5 of the multilayer rope 1, an exposed portion 6 is formed by peeling off a portion of the protective layer 4 to expose the core 2 and the covering layer 3 from the protective layer 4. This exposed portion 6 at the end portion 5 and the protective layer 4 adjacent thereto are integrally bonded and fixed with an adhesive, and a joist portion 7 that is thicker than the outer diameter of the protective layer 4 is formed.

When forming the joist part 7 with an adhesive, the adhesive penetrates between the fibers of the core body 2 and the coating layer 3 in the exposed part 6 and firmly bonds and fixes them to each other. The body 2 and the covering layer 3 are fixed together. At the same time, these core body 2 and coating layer 3
is also integrally adhesively fixed to the protective layer 4 of the end portion 5 by the joist portion 7 . Therefore, the core body 2, the covering layer 3, and the protective layer 4 are integrally adhesively fixed at the end portion 5.

Figure 3 shows multilayer rope 1 with the end treatment shown in Figure 2.
FIG. 3 is a partial perspective view showing an example in which a mounting portion is attached near the end of the wire for use as a net tensioner. The vicinity of the end of the multilayer rope 1 is folded back to form a loop, and a metal annular body 8 is fixed to the inner periphery of the rope for reinforcement using an epoxy resin adhesive or the like. On the other hand, the ends of the folded multilayer rope 1 are overlapped and clamped with a clamp 9 to be firmly fixed. At least one clamp 9 can be used, and several clamps can be used as necessary.
A mounting portion 10 is formed by the annular body 8 and the clamp 9.

Next, in order to compare the performance of the multilayer rope of the present invention with that of a conventional wire rope, a multilayer rope with the end treated as follows was manufactured. That is, as the core body 2, two filament bundles of Kevlar (trade name), which is an aromatic polyamide fiber commercially available from DuPont, are loosely twisted, and 16 of the twisted filaments are combined. A loose braid is used to create an outer diameter of 2 to 3 mm, and as the covering layer 3 on the outer periphery, a thread of 1.5 to 3 mm is made by twisting polypropylene monofilament fibers into the string.
A 2.5 mm (outside diameter: 4.5 mm) braided cord layer is used, and a protective layer 4 on the outer periphery is made of thermoplastic polyester elastomer (DuPont's Hytrail product), which is a flexible synthetic resin that exhibits rubber elasticity at room temperature. given name))
Using a layer with a thickness of 1.5 mm (outer diameter 6 mm),
We created a multilayer rope with a three-layer structure.

Next, an exposed part with a length of about 20 to 30 mm is formed at both ends, and an outer diameter of about 8 to 30 mm is formed between the exposed part and the surface of the protective layer adjacent thereto using an epoxy resin adhesive. A joist with a diameter of 15 mm and a length of approximately 40 mm was formed. A mounting portion 10 is formed at the end of the rope thus obtained using a clamp 9 and an annular body 8 as shown in FIG.

The weight of a multilayer rope terminated in this way is approx.
It had a tensile strength of 26g/m and approximately 1000Kg. For reference, the tensile strength of the above multilayer rope without end treatment (only the attachment part 10 is formed in the same way) is approximately 450Kg.
It was hot. This is because the core body 2, the covering layer 3, and the protective layer 4 would separate and move from each other in the longitudinal direction in the absence of the earlier end treatment.

From these results, it can be seen that the tensile strength of the end-treated multilayer rope of the present invention is very high.

[Effect of idea]

Since the end-treated multilayer rope of the present invention has the above-described structure, it does not suffer from the dangerous cracking or lack of flexibility, which are the drawbacks of wire ropes. Further, unlike when a conventional multilayer rope is used as it is with a clamp, the clamp part does not come off, resulting in a highly safe product with excellent weather resistance and water resistance. That is, in the multilayer rope of the present invention, the end portions of each layer are fully exposed in the longitudinal direction, and the layers are integrally and continuously joined with an adhesive to form a joist.

Therefore, the layers do not shift from each other, and together support external forces. Therefore,
It is suitable as a rope for stretching outdoors such as tennis courts.

[Brief explanation of drawings]

Fig. 1 is an enlarged partial perspective view showing an example of the structure of a multilayer rope that is subject to the end treatment of the present invention, Fig. 2 is an enlarged partial perspective view showing the main parts of the end treatment of the present invention, and Fig. 3 is an enlarged partial perspective view showing the main part of the end treatment of the present invention. The partial perspective view which shows the whole end treatment part of the same multilayer rope. DESCRIPTION OF SYMBOLS 1... Multilayer rope, 2... Core body, 3... Covering layer, 4... Protective layer, 5... End part, 6... Exposed part, 7... Joist part, 8... Annular body, 9... ...Clamp, 10...Mounting part.

Claims (1)

[Scope of utility model registration request] A covering layer 3 made of a braided flex-resistant fiber and a protective layer 4 made of a flexible synthetic resin film are laminated in this order on the outer periphery of a core 2 made of a braided aromatic polyamide fiber. A multilayer rope 1 consisting of a multi-layered rope 1 comprising: a distal end 5 of the rope 1, the coating layer 3 fully exposed in the longitudinal direction from the tip of the protective layer 4, and the core sufficiently exposed in the longitudinal direction from the tip of the coating layer 3. Each exposed portion 6 of the body 2 is formed, and all of the exposed portions 6 at the end portion 5 and between the exposed portion and the protective layer 4 are integrally adhesively fixed with an adhesive, A joist portion 7 that is thicker than the outer diameter of the protective layer is formed, and a portion relatively close to the joist portion 7 is folded back and bent, whereby a pair of portions close to each other are fastened and fixed to each other by a clamp. an annular attachment portion is formed on one side of the clamp, and the joist portion is formed relatively adjacent to the clamp, and is configured to apply an external force to the attachment portion. rope.