JP2002137885A - Sling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost sling having strength and expansion rate similar to those of normal products, and having a function for warning of its limit of use, using colors, based on the elongation and degradation of the product. SOLUTION: The sling is of a three-layered structure consisting of a surface layer part, a core layer part and a back layer part formed of threads made from the same material in the same color. Colored threads whose colors differ from the color of the threads constituting the layers are woven in between adjacent layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-shaped sling used for suspending various heavy equipment and articles.

[0002]

2. Description of the Related Art A belt-shaped sling made of woven fabric is used for lifting heavy objects such as various heavy machines and articles.

[0003] In this sling, there is a so-called signal sling in which a danger is notified in advance before a safe use strength is lost due to wear or breakage.

FIG. 6 shows an example of a conventional signal sling. FIG. 6A is a cross-sectional view cut in the width direction.
(B) is a cross-sectional view cut in the length direction, and the surface layer portion 1,
The core layer 3 has a three-layer structure composed of three parts, that is, the core layer 3, and is used for the other surface layer 1 and the back layer 2 except for both ends of the warp of the core layer 3. The color yarn 6 of a different color from the existing yarn is used.

[0005] As the sling is used, the yarns constituting the outer surface layer 1 and the back layer 2 are rubbed and worn or broken to reduce the strength, or the sling is returned to its original state after being extended after being hung. And so on.

[0006] At this time, if the sling is used beyond its limit, the sling may break during use and the suspended object may fall.

However, in the signal sling, if the yarns constituting the surface layer portion 1 and the back layer portion 2 are rubbed and worn with use, the colored yarns 6 constituting the inner core layer portion 3 become visible to the naked eye from outside. By stopping the use of the sling at this point, the use of the sling exceeding the usage limit can be prevented.

[0008]

In the signal sling described above, the yarn used for the core layer portion 3 uses a color yarn 6 having a different color from the yarns constituting the surface layer portion 1 and the back layer portion 2. However, as the means, only the core layer 3 is made of a material different from that of the other parts.

For example, while the warp yarns 4 and the weft yarns 5 used for the surface layer 1 and the back layer 2 are mainly made of nylon, only the color yarns 6 constituting the core layer 3 are made of tetron. May be used.

By the way, only the core layer 3 is provided with a color yarn 6 of a different material.
When the core layer 3 is used, the physical properties of the yarn are different between the core layer portion 3 and the surface layer portion 1 and the back layer portion 2 on both sides thereof. There have been problems such as different elongation rates and reduced life and durability.

In some cases, the original yarn is used as the color yarn 6 having a different color, but the original yarn is expensive and there is a problem that the cost of the signal sling increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-cost sling having the same strength and elongation as a normal product in a signal sling for warning the use limit due to elongation or deterioration of the product by color.

[0013]

Means for Solving the Problems In order to solve the above problems, the invention of claim 1 is a three-layered sling comprising a surface layer portion, a core layer portion, and a back layer portion. The sling is composed of yarns of the same color and the same color, and between the two layers, yarns of a color different from the yarn constituting each layer are woven in an amount of 25% by weight or less of the warp of the entire sling.

[0014] The invention according to claim 2 provides a surface layer portion, a core layer portion,
And a sling of a three-layer structure consisting of a back layer part, each layer is composed of yarn of the same color and the same color, between any layers,
This is a sling in which a yarn different in color from the yarn constituting each layer is incorporated in an amount of 25% by weight or less of the warp of the entire sling.

Further, the invention of claim 3 is the sling according to any one of claims 1 and 2, wherein color yarns of a color different from the yarn constituting each layer are intermittently arranged between the layers.

In the above-mentioned invention, the three-layered sling has the same elongation and deterioration over the entire sling, and does not have a warning function, because each layer is made of yarn of the same color and the same color. It has the same function, strength and life as conventional slings.

A yarn having a color different from that of the yarn constituting each layer incorporated between the layers can be used when the life of the sling has been extended due to breakage or extension of the sling without affecting the strength of the sling. A warning function is provided to notify the user of the fact that the sling has reached its end of life by being visible from the outside.

Further, the color yarn only needs to be present between the respective layers, the amount used is smaller than that of the conventional color yarn, and the use of a high-cost original yarn does not lead to a large increase in cost.

In the sling according to the second aspect, the colored yarn exists only between the surface layer and the core layer or between the back layer and the core layer. The amount can be reduced, but when the colored yarn is visible from the outside of any layer,
It is possible to judge that the outer surface layer or the back layer has deteriorated and warn that the life of the sling has come.

Further, in the sling according to the third aspect, the color yarns are intermittently arranged between the layers, so that the amount of use can be further reduced. It can be determined that the surface layer portion or the back layer portion has deteriorated, and it is possible to warn that the life of the sling has come.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings, in which the same parts as those in the conventional example in FIG.

FIG. 1 shows a first embodiment of the sling of the present invention, in which (A) is a cross-sectional view cut in the width direction, and (B) is a cross-sectional view cut in the length direction. .

This sling adopts a three-layer structure of a surface layer 1, a back layer 2, and a core layer 3, and the width of the sling is about 5 mm.
It has a thickness of 2 mm and a thickness of about 4 mm in three layers, and is connected in an arbitrary length to form a ring.

Each of these layers is formed by weaving a warp yarn 4 and a weft yarn 5. The warp yarns 4 and the weft yarn 5 are made of the same kind of yarn, for example, nylon, in consideration of the strength and elongation of the sling. It is configured using.

The surface layer and the core layer, and the back layer and the core layer
On one boundary line, the color yarns 7 are arranged in the same direction as the warp yarns 4 of each layer.

The raw material of the color yarn 7 is not particularly limited, but it is necessary that the color is at least different from that of the yarn constituting the surface layer 1 and the back layer 2, and from the warning function, the color is as conspicuous as possible. Preferably, it is

For example, when the warp yarns 4 and the weft yarns 5 forming each layer are light-colored, the color yarns 7 are made darker or have a complementary color.

Then, the color yarn 7 includes the surface layer 1, the core layer 3,
In addition, since the back layer portion 2 retains the strength of the sling, it is merely knitted between the layers, so that it is not necessary to contribute to the strength of the sling, so that a wide range of yarn materials can be selected.

It is sufficient to sew the colored yarn 7 at 25% by weight or less, usually 10% or 5% by weight or less of the warp 4 of the entire sling on each boundary between the layers. Since the function is exhibited, the use amount of the color thread 7 is relatively small.

On the other hand, since it is not necessary to consider the warning function by the colors of the surface layer 1, core layer 3, and back layer 2 of the sling, all three layers only consider the elongation, strength, life, and the like. Since it is possible to use such a material, it exhibits the same elongation, strength, life, and the like as those of the conventional three-layered sling.

When the sling has been used for a long period of time, the surface layer 1 and the back layer 2 are rubbed and worn or damaged, and the predetermined elongation and strength cannot be exhibited. The color thread 7 existing on the boundary between the core layer portion 2 and the core layer portion 3 can be visually confirmed from the outside. At this point, if the use of the sling is stopped and the subsequent use of the sling is stopped, It is possible to prevent accidents caused by the use.

FIGS. 2A and 2B show another example of the sling of the present invention. FIG. 2A is a sectional view cut in the width direction, and FIG.
FIG. 1 is a cross-sectional view cut in the length direction. FIG. 1 shows a color yarn 7 having a different color between the surface layer portion 1 and the core layer portion 3 and the back layer portion 2.
In contrast to the use at two locations between the core layer 3 and the core layer 3, the use at only one location between the surface layer 1 and the core layer 3 is used.

The warp yarns 4, the weft yarns 5, and the color yarns 7 constituting each of the surface layer 1, the core layer 3, and the back layer 2 are exactly the same as those in FIG.

In the case of this embodiment, there is an advantage that the used amount of the color thread 7 can be halved with respect to the sling shown in FIG.

With respect to the warning function, if the yarn of the surface layer 1 is worn out or broken, the colored yarn 7 at the boundary between the surface layer 1 and the core layer 3 can be visually confirmed, and the subsequent use. A warning function for canceling is performed.

In FIG. 2, the colored yarn 7 is arranged on the boundary between the surface layer 1 and the core layer 3, but the colored yarn 7 is arranged only between the back layer 2 and the core layer 3. You may do it.

FIG. 3 is a cross-sectional view showing another example of the sling of the present invention cut in the width direction. The sling has a three-layer structure of a surface layer 1, a core layer 3, and a back layer 2. Is similar to the sling of FIGS. 1 and 2.

As shown in FIG. 1, the colored yarns 7 are present on the boundaries between the surface layer 1 and the core layer 3 and between the back layer 2 and the core layer 3, respectively. Although arranged in the same direction, a group of several colored yarns 7 arranged at predetermined intervals is arranged.

In the case of this embodiment, the used amount of the color thread 7 is shown in FIG.
There is an advantage that it can be greatly reduced with respect to the sling shown in FIG.
The color thread 7 may be arranged only on one of the two layers.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The signal sling belt of the present invention is applied to a surface layer 1 (ground yarn), a core layer 3 (middle) and a back layer portion 2 (ground yarn) as shown in the sectional view of FIG. Each of the yarns was formed into a flat triple woven structure using regular yarns 8, and a small amount of red dyed yarns 9 was inserted between the layers and woven.

Table 1 shows the use of each thread. The regular yarn 8 of 1260de is manufactured by Teijin Limited.
The 1500d original yarn 9 was also manufactured by Teijin Limited.

This belt is heated by a thermoble dyeing machine.
The product was dyed yellow, and then coated with a resin such as a softener and dried to obtain a product.

[0043]

[Table 1]

As is clear from Table 1, the average strength of the belt for sling was 4323.3 kgf.

In order to examine a decrease in strength when the sling belt is damaged, the sling belt is artificially scratched from one side in the thickness direction, and as shown in FIG. 5, the cut portion 10 indicated by the hatched portion is removed. When the reduction in the strength of the belt was measured, it was confirmed that the strength was about 70% (average value: 3080.3 kgf).

The conventional core layer 3 using a different material is:
Although the strength decreases significantly with use, in the signal sling of the present invention, only the strength is reduced in proportion to the cut portion, and based on this result, various sewing products can be manufactured by reflecting the above results. Was.

[0047]

As described above, according to the sling of the present invention, since each layer portion is composed of yarns of the same color and the same color, the elongation and deterioration are uniform over the entire sling and the conventional sling does not have a warning function. While having the same function, strength and life as the sling, when the life of the sling has expired due to breakage or extension, the yarn with a different color from the yarn constituting each layer incorporated between the layers A warning function that indicates that the life of the sling has expired is provided by being visible from the outside.

Since these colored yarns are present only between the respective layers, they do not affect the elongation and strength of the sling, and the amount used is small. Is also low cost.

In some cases, the color yarns are arranged only in one of the two layers, or the color yarns are arranged intermittently in groups of several to use the color yarns. The amount can be further reduced.

[Brief description of the drawings]

FIG. 1 shows an example of a sling of the present invention.
(A) is a cross-sectional view cut in the width direction, and (B) is a cross-sectional view cut in the length direction.

FIG. 2 shows another example of the sling of the present invention.
(A) is a cross-sectional view cut in the width direction, and (B) is a cross-sectional view cut in the length direction.

FIG. 3 is a cross-sectional view illustrating another example of the sling of the present invention, which is cut in a width direction.

FIG. 4 is a cross-sectional view of the sling according to the embodiment of the present invention, cut in a width direction.

FIG. 5 is a cross-sectional view showing a state in which a part of the sling of the present invention is cut away and is cut in a width direction.

FIG. 6 shows a conventional signal sling, wherein (A)
Is a cross-sectional view cut in the width direction, and (B) is a cross-sectional view cut in the length direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface layer part 2 Back layer part 3 Core layer part 4 Warp 5 Weft 6 Color thread 7 Color thread 8 Regular thread 9 Original thread 10 Cut part

Claims (3)

[Claims] 1. A sling having a three-layer structure comprising a surface layer, a core layer, and a back layer, wherein each layer is formed of a yarn of the same color and the same color, and a yarn forming each layer is provided between two layers. Is a sling characterized by incorporating different colored yarns in an amount of not more than 25% by weight of the warp of the entire sling. 2. A sling having a three-layer structure comprising a surface layer, a core layer, and a back layer, wherein each layer is composed of yarns of the same color and of the same color. A sling characterized in that a color yarn different in color from the sling is incorporated in an amount of 25% by weight or less of the warp of the entire sling. 3. The sling according to claim 1, wherein a color yarn different in color from the yarn constituting each layer is intermittently arranged between the layers.