JPH0663567U - Fiber sling with overload indicator - Google Patents

Abstract

(57) [Summary] [Purpose] To make it easier to judge the deterioration status of the core or the disposal. [Structure] A cylindrical sheath 1 accommodates a continuous filament yarn 2 in a meandering or zigzag form with a core 4 formed into a serpentine shape 3 in a shortened state, and is superposed. 1 Join both ends to the core 4 without sewn to the specified length 5
The configuration provided with an overload display section characterized by the above. [Effect] It was found that the lifting load above the set value was applied by cutting the splicing yarn 51 in the superposed splicing part of the cylindrical sheath, and the degree of damage to the inner core part could be found. Is possible. Further, from this, it is possible to prevent a cutting accident from occurring.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fiber sling used when suspending a transported object by a crane hook or the like.

[0002]

[Prior art and problems]

 Conventionally, when lifting a heavy object, a so-called soft type sling is often used, in which a core material made of concentrically wound synthetic fiber yarn with high tensile strength is covered with a sheath material to form a ring shape or both eye types. It was being done. This is because it is more flexible than the processed belt and it is easy to adapt to the shape of the object to be hung, and the lifting state is stable. However, since it is covered with a sheath material, there is a problem. In other words, it was impossible to judge the deterioration state of the core material by appearance. There are several types of fiber slings prepared based on the required length and required strength, depending on the object to be hoisted.However, in some cases, the weight of the hoisted object cannot be determined, and in some cases, a drop accident may occur. Occurrence was seen. Of course, since the safety factor is set to a high level, for example, for 2 tons, even if 3 tons are lifted, it will not be cut, but it is conceivable to cut the core wire. If such a situation is repeated, a considerable number of wire strand breaks will occur, and it is in such a case that a cutting accident will occur even if a heavy object within the specifications is lifted.

[0003]

[Means for Solving the Problems]

 In order to solve the problems of the coated soft type sling as described above, in the present application, an overload indicator is provided on the sheath, and if a heavy object having a weight of a set value or more is lifted, the history remains, It makes it easier to inspect or judge whether to dispose of the product. As a concrete means, the elongation amount of the sheath 1 is set to be smaller than that of the core, and when a hoisting load equal to or more than the set value is applied, the sewing thread at the 5 superposition joints of the cylindrical sheath 1 is cut. The exposed core portion achieves the purpose.

[0004]

【Example】

 To describe an example of the present application, the core portion 4 is made of aramid fiber in order to obtain a high tension, and is composed of continuous filament yarns 2 in a concentric ridge shape 3. The sheath 1 is a double weave of nylon and aramid. Specifically, nylon is used for the front warp and weft, aramid is used for the back warp, and nylon is used for the weft. The storage of the core part 4 in the sheath part 1 is performed by covering the core part 4 of the rib 3 with the woven fabric of the predetermined width of the sheath part 1 and wrapping and sewn both ends in the width direction with predetermined strength over the entire length. Is. The aramid fiber used for the core part 4 has high tension, but has low weather resistance, wear resistance, and elongation, and the nylon used for the sheath part 1 has weather resistance, wear resistance, and high elongation. Therefore, as a share of the sling function, the load is supported by the aramid fiber of the core 4, and the nylon fiber of the sheath 1 protects the core 4 from ultraviolet rays and acid rain. As mentioned above as a means for solving the problem, in order to perform the sewing thread cutting of the overlapped portion of the sheath portion 1 at the time of overloading, the elongation of the sheath portion 1 is reduced so that the sheath portion 1 is loaded earlier than the core portion 4. Therefore, when accommodating the core portion 4 in the sheath portion 1, the core portion 4 is formed in a meandering or meandering shape to increase the distance, and the length is longer than the elongation amount of the sheath portion 1 under a predetermined load load. It is set to become. Generally, the elongation of aramid fibers is around 5% and the elongation of nylon fibers is around 30%. However, since the sheath portion 1 of this embodiment is made of a mixed weave of nylon and aramid, its elongation is Is around 15%. If we now consider the construction of an endless sling with a circumference of 3 meters, the sheath 1 is 3 meters and its maximum extension is 45 cm, and the core 4 is the same length as the sheath 1 but is 3 meters. The amount of extension is 15 cm. Therefore, it is a theory that the splicing yarn 51 of the sheath portion 1 cannot be cut first unless the core portion 4 is expected to have a difference in elongation amount of 30 cm or more. In actual production, 40 cm or more is expected in consideration of factors such as the amount of elongation of the splicing yarn 51 and the contraction of the sheath 1 due to drying, and 40 cm of this is to meander in the sheath 1. Is to be stored by. When the sheath 1 that has finished storing the core 4 is overlapped at both abutting ends, both sides are sewn and joined to the core 4 without sewing. As described above, in the present embodiment, the core portion 4 was made of aramid fiber and the sheath portion 1 was made of a mixed weave of nylon and aramid. It is a structure for obtaining the sheath portion 1 which is flexible and has a small elongation. In order to achieve the object of the present application, it is basically possible to use the core 4 and the sheath 1 having different elongations and to make the overlapping part of the sheath 1 detachable. The use of polyester yarn in part 4 and aramid in sheath 1 reduces the need for meandering if the aramid fiber can be treated for weathering, because the elongation of polyester is higher than that of aramid. is there. Even if the same material is used for both, the purpose can be achieved if the fracture value of the sheath 1 and the polymerized joint is low. In addition, using the sheath 1 woven into a cylindrical shape has the same effect.

[0005]

[Effect of device]

 As described above, when the hoisting work is performed by the endless sling using the present invention, if the weight of the hoisted object is heavy and the inner core material is damaged, the joint part of the sheath material is dissociated and the user is It calls attention. Therefore, it is possible to prevent the occurrence of a cutting accident by reusing the core material without knowing the damage of the core material as in the past.

[Brief description of drawings]

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

FIG. 2 is an enlarged front view of a part of the joint of the present invention with a part cut away.

FIG. 3 is a cut end view of the joint portion of the present invention.

FIG. 4 is a perspective view of a conventional product.

[Explanation of symbols]

 1 Sheath part 2 Filament yarn 3 Ridges 4 Core part 5 Joint 51 Joint yarn

Claims (1)

[Scope of utility model registration request] 1. A cylindrical sheath portion 1 accommodates a continuous filament yarn 2 in a meandering or zigzag form with a core portion 4 formed into a ridge 3 in a shortened state and polymerizes. Sheath part 1 A fiber sling provided with an overload display part, characterized in that both ends are joined to a core part 4 for a predetermined length without being sewn.