JP3009236U - Soft sling with overload indicator - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To prevent overload and perform safe work. [Structure] An identification piece 4 is arranged on a superposed sewing portion of a soft sling in which a ridge-shaped core portion 1 is covered with a cylindrical sheath portion 2. [Effect] The appearance of the identification piece calls attention to the user and, in a more dangerous state, informs that the overlapped portion is separated and cannot be reused. It is possible to prevent accidents such as cutting accidents by reusing without notice. Further, it is not necessary to easily apply an overload to separate the polymerized portion and dispose of it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sling used when hoisting a transported object by a hook of a crane or the like, and particularly relates to a method of displaying an overload load history of an endless soft sling in which a ridge-shaped core is covered with a sheath. It is a thing.

[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, which is formed by concentrically winding a synthetic fiber yarn having high tensile strength, is covered with a sheath material to form a ring shape or both eye types. Was there. This is because it is more flexible than the processed belt, and it is easier 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. Several types of fiber slings are prepared based on the required length and required strength, depending on the object to be hoisted.However, sometimes the weight of hoisted objects cannot be determined, and sometimes a cutting drop accident occurs. Was seen. Of course, since the safety factor is set to be high, for example, even if 3t is lifted for 2t, it will not be cut, but it is conceivable to cut the core wire of the core. If this kind of situation is repeated, a considerable number of wire breaks have occurred, and it is in such a case that a cutting accident will occur even if a heavy object within the specifications is lifted. Therefore, when materials with different elongations are used for the core and the sheath, and the elongation of the sheath is set smaller than that of the core, when a lifting load above the set value is applied, the overlapped joint of the sheath is The sewing thread was cut first and the core was exposed, so it was used as a guide for disposal. However, with this configuration, it is only possible to select either usable or discarded, and it is judged that it is safe if the overlapped joint is in a polymerized state, and it is used in a dangerous state immediately before separation. Sometimes I continued. In addition, it was also considered that the situation immediately before separation could not be accurately grasped, and an overload was applied, and the overlapping part separated and was unavoidably unavoidable.

[0003]

[Means for Solving the Problems]

 In order to eliminate such a dangerous condition and uneconomical situation, the red tape is sewn at the same time as an identification piece at the end of the overlapped joint, and the red tape appears visible with a slight overload until separation. This is to give a warning.

[0004]

【Example】

 To describe an example of the present application, the core portion 1 is made of aramid fiber in order to obtain high tension, and is formed into a concentric ridge shape with continuous filament yarn. The sheath 2 is a double weave of nylon and aramid. The core part 1 is stored in the sheath part 2 by covering the sheath-shaped core part 1 with the cloth of the predetermined width of the sheath part 2 and wrapping it, and stitching the overlapped widthwise ends at a certain strength over the entire length. is there. The aramid fiber used for the core part 1 has high tension but low weather resistance, wear resistance and elongation, and the nylon used for the sheath part 2 has weather resistance, wear resistance and high elongation. Therefore, as a share of the sling function, the aramid fiber of the core 1 supports the load, and the nylon fiber of the sheath 2 protects the core 1 from ultraviolet rays and acid rain. In order to perform the sewing thread cutting of the overlapped portion of the sheath 1 under overload, it is necessary to set the elongation of the sheath 2 to be small so that the load is applied to the sheath 2 before to the core 1. In housing the sheath 2 in the sheath 2, the core 1 is formed in a meandering or zigzag shape to increase the distance, and its length is set to be longer than the amount of extension of the sheath 2 when a predetermined load is applied. The sheath 2 which has finished accommodating the core 1 is superposed for a predetermined length on both ends, and is sewn to a predetermined strength with the red tape being sandwiched between the overlapped portions 3 as a discriminating piece 4 at a position about 1 cm. In order to prevent the thread 6 of the sewing portion from being cut due to wear and to maintain the strength of the overlapping portion 3 as designed, the protective cloth 5 is further wound. The operation of the configuration of the present application shows that if a 4t tape is used, the sheath 2 extends when a load of about 4.5t is loaded, and a red tape appears from the end of the overlapping part 3 Call attention to. This will stop the immediate use and replace it with one designed for higher loads to carry out lifting work. If the red tape is not noticed and a larger load is applied, the sewing thread 6 of the overlapping part 3 will be cut and separated at 6 t, and the creases of the core part 1 with different color tones will appear, and the dangerous load will be easily applied. You will notice that. In addition, in the ring-shaped sling, the overlapped joints are set at two places, so even if one place is in contact with the load when the load is suspended and the overlapped part 3 cannot extend, the other place is It can function and achieve its purpose. Further, although red tape is used in the embodiment, the color can be arbitrarily selected and set, but it is desirable that the color has a complementary color relationship with the sheath 2.

[0005]

[Effect of device]

 As described above, by performing the hoisting work with the endless sling using the present invention, when the weight of the hoisted object is not sufficient for the sling, the red tape on the overlapped portion appears to alert the user. However, if it is in a more dangerous state, it informs that the polymerized part is separated and cannot be reused. 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 before, and it is also easy to apply an overload to separate the overlapping part. However, there is no need to dispose of it.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an overlapping portion of the present invention.

FIG. 2 is a side view of the overlapping portion of the present invention.

FIG. 3 is a front view of the polymerized portion of the present invention when pulled.

FIG. 4 is a perspective view of a soft sling according to the present invention.

[Explanation of symbols]

 1 Core 2 Sheath 3 Overlap 4 Identification piece 5 Protective cloth 6 Sewing thread

Claims (1)

[Scope of utility model registration request] 1. A soft sling having a structure in which a ridge-shaped core portion 1 is covered with a cylindrical sheath portion 2, and the sheath portion 2 is divided into two parts and corresponding ends are polymerized by a predetermined length, and the polymerized part is formed. A soft sling provided with an overload display section characterized in that an identification piece 4 is arranged inside 3 and is sewn to a predetermined strength and covered with a protective cloth 5.