JP3242035B2 - Belt sling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber belt sling having eyes at both ends, which is easy to use, has high durability, and has a long life.

[0002]

2. Description of the Related Art Fiber belt slings (hereinafter abbreviated as belt slings) not only have high strength, but also have a soft property not found in wire ropes and chains. Due to its ease of handling, it is widely used not only for loads that are easily damaged, but also for slinging heavy loads. Conventional belt slings with eyes (suspension rings) at both ends are provided with eyes at both ends of a single-layered or multi-layered and densely woven belt, and when it is necessary to increase wear resistance or weather resistance A cover cloth or a pad cloth is used to cover or attach to a required portion.
The load is received by the belt sling body because the purpose of the cover or patch cloth is to wear or weather. Therefore, in order to increase the strength (withstand load) of the belt sling, conventionally, it has been general to study the fiber material and the weaving method of the belt sling body.

[0003] Many examples of fiber materials and weaving methods of the belt sling body for increasing the strength of the belt sling have been reported. The present inventor has previously described JP-A-7-41279.
In the belt sling for high load proposed in the above item, the structure is much stronger than that of the conventional nylon made even with a narrow width by using an aromatic polyamide fiber for the fiber. In the example using the aromatic polyamide fiber, the fiber is covered with a weather-resistant cover in order to enhance light resistance (weather resistance). In Japanese Patent Application No. 8-84107, a tubular woven fabric is used to provide a sliding action to the weather-resistant cover. Thus, the conventional function of the cover has been to increase the abrasion resistance of the inner fiber fabric or to shield light so that the inner fibers do not undergo photolysis.

[0004]

As described above, many studies have been made on the fiber material and the weaving method of the belt sling body for increasing the strength of the belt sling, and it is considerably difficult to further increase the strength. Have difficulty. The present inventor does not depend on the fiber material and the weaving method of the belt sling body, suppresses the cost of the belt sling, increases the durability,
In addition, we considered enhancing safety.

[0005]

As a result of examining the above-mentioned problems, the present invention provides that a belt belt sling having double-ended eyes has at least one surface of a portion corresponding to a suspended object at an intermediate portion of the belt body in the belt body. It is a belt sling obtained by sewing a low elongation belt woven with fibers having higher strength and lower elongation than the material integrally with the main belt. The term “at least one side” as used herein means having a low elongation belt on one side or both sides of a planar portion that contacts a suspended object.

[0006] In the belt sling, to form a HisokaNui attaching portion by sewing widening in <br/> pot sewing strength equivalent ho sewing portion of the belt sling and low elongation belt end portions and the main body belt A finished belt sling.

[0007]

FIG. 1 is a perspective view of a belt sling of the present invention, FIG. 2 is an enlarged view of a section taken along line XX in FIG. 1, FIG. 3 is an enlarged view of a section taken along line YY in FIG. FIG. 4 shows Z in FIG.
It is a -Z cut end surface enlarged view. The illustrated belt sling of the present invention is a portion of the belt sling having eyes 1,1 at both ends, which is a belt sling and woven from polyester fibers (strength 9 g / d, elongation 15.0%). A low elongation belt 3 woven with an aromatic polyamide fiber (aramid fiber, strength 28 g / d, elongation 4.6%) having a higher strength and a lower elongation than the material of the belt body is integrally sewn with the main belt 2. I'm wearing

The both ends of the low elongation belt 3 and the main body belt 2 are further sewn by a length C substantially equal to the length B of the sewn portion 4 of the belt sling to form a densely sewn portion 5 ( (See FIGS. 1 and 3) Length 2 × of both ends of low elongation belt 3
The length of the low elongation belt 3 is determined by C and the length E of the intermediate portion, and the low elongation belt 3 having this length contributes to load resistance in normal use. The length A of the eye 1,1 is the same as that of a commonly used eye.

The effect when the low elongation belt 3 is provided on the main belt 2 will be described with reference to Table 1.

[0010]

[Table 1]

Example 1, Comparative Examples 1 to 3 Comparative Example 1 is a commercially available belt sling in which a belt body without the low elongation belt 3 is formed by weaving polyester fibers to a width of 50 mm. The length of the sewing part of the belt sling is almost
250 mm. Comparative Example 2 is an example in which a low elongation belt was formed from the same polyester fiber and the same polyester fiber of the same belt body as the above-described example, and was sewn to both sides of the belt body. Example 1 is an aromatic polyamide fiber (aramid fiber).
This is an example in which a low elongation belt woven to a width of 75 mm is sewn to both sides of a belt body used in a comparative example. The sewing length is 250 mm. Comparative Example 3 is an example in which a low elongation belt woven with an aromatic polyamide fiber to a width of 75 mm was sewn to both sides of the belt body used in the comparative examples. The sewing length is 50 mm.

The methods of measuring the breaking strength, elongation and breaking point shown in Table 1 are as follows. Each belt sling is suspended in a basket by hanging the hooks on both sides of the eye so that the belt sling is U-shaped, and the load is applied to the lower part in the middle. The value at the time of breaking was measured by gradually increasing the value. From the results in Table 1, the following is clear. That is, even if a low elongation belt is formed from fibers of the same material as the belt body and sewn to one or both sides of the belt body, the breaking strength cannot be increased. It is necessary to form a low elongation belt with fibers having a higher strength and a lower elongation than fibers of the belt body such as aromatic polyamide fibers. Further, the sewing length of the low elongation belt is also important, and it is necessary to increase the sewing with a length substantially equal to the length of the sewn portion of the belt sling or the same sewing strength as the sewn portion.

Example 2 A portion of the belt main body 2 made of three layers of nylon 66 strong yarn (manufactured by Asahi Kasei Kogyo Co., Ltd.) having a strength of 10 g / d and an elongation of 20.3% is applied to a portion corresponding to an object to be hung. , Polyarylate fiber (strength 26g /
d, a low elongation belt 3 woven with 3.8% elongation, trade name Vectran HT, manufactured by Kuraray Co., Ltd.) was sewn integrally with the main body belt 2 as shown in FIG. In this case, too, the low elongation belt 3 made of polyarylate fiber becomes a strength member, and even if the belt sling tends to elongate, the low elongation belt 3 keeps the elongation constant, and breaks first, the thread of the low elongation belt breaks. Such as starting
As a result, the prevention of breakage of the belt main body and the securing of safety were obtained.

Examples 3 and 4 The fibers of the belt body 2 are the same polyester fibers as in Example 1, and the fibers of the low elongation belt 3 are ultrahigh molecular weight polyethylene fibers (strength 35 g / d, elongation 4.0%, trade name Tekmylon). , Toyobo
Co., Ltd., Example 3) and strong vinylon (strength 17 g / d, elongation
In the case of 5.0%, manufactured by Kuraray Co., Ltd., Example 4), the effect of suppressing the elongation and increasing the durability was obtained even when the belt body had the conventional structure, as in the previous examples. .

[0015]

According to the present invention, the elongation of the belt sling can be suppressed, and the safety and durability can be improved.
That is, since the low elongation belt is integrated with the belt body, the low elongation belt contributes to the load capacity during normal use, and when the low elongation belt wears, the belt body becomes a load-bearing member. Therefore, safety can be maintained for a long time and durability can be exhibited. Further, since the low elongation belt protects the belt main body in the same manner as the conventional cover cloth and patch cloth, the belt main body can always be kept in a new state.

[Brief description of the drawings]

FIG. 1 is a perspective view of a belt sling of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line XX of FIG. 1 of the belt sling of the present invention.

FIG. 3 is an enlarged sectional view taken along the line YY in FIG. 1 of the belt sling of the present invention.

FIG. 4 is an enlarged view of a ZZ cut end surface in FIG. 1 of the belt sling of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Eye 2 Belt main body 3 Low elongation belt 4 Belt sling sewing part 5 Tightly sewing part

Claims (1)

(57) [Claims] At least one surface of a fiber belt sling having eyes at both ends, which is an intermediate portion of the belt body and which is to be hung, is woven with fibers of higher strength and lower elongation than the material of the belt body. the low stretch belt sewn integrally with the body belt, to form a HisokaNui attaching portion by sewing widening in substantially the same sewing strength sewing portion of the belt sling and low elongation belt end portions and the main body belt Belt sling that is finished.