JPH0647040Y2 - Safety rope - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention relates to a safety rope which is used to prevent a fall in high-altitude work or work on a steep slope.

2. Description of the Related Art Conventional safety ropes of this type include, for example, the Japanese Utility Model No.
As shown in Japanese Patent No. 9997, a colored marking yarn is arranged between a core portion and a skin portion of a strand constituting a rope, and when the rope is repeatedly used and worn or damaged, the marked yarn is used. It is known that the rope is exposed on the surface and the strength of the rope is reduced so that it can be visually recognized.

Problems to be Solved by the Invention However, in this type of rope, dyed yarns are used as marker yarns, but when dyeing ordinary yarns, the yarns shrink during the dyeing process, resulting in undyed yarns. Compared to this, the growth is large. Moreover, its elongation has a large tendency of plastic deformation, and once it is stretched under tension, the elongation remains as permanent elongation and does not shrink even if the tension is removed.

Therefore, if such a dyed yarn is placed between the core and the skin of the rope, when the rope is repeatedly tensioned and expanded and contracted, the marker yarn is permanently stretched, and the marker yarn meanders in the strand and the leather part is stretched. May protrude from between the yarns.

In such a state, disturbance occurs also in the direction of the leather yarn in the strand, and the strength is lowered, and it becomes easy to be worn or damaged. In addition, the marking yarn is exposed even though the skin is not yet worn, which may lead to a false recognition of the damaged state of the rope, and the reliability of the damage detection function due to the exposure of the marking yarn is impaired. It can also lead to the danger of continued use of damaged and weakened rope.

The present invention has been made in view of the above circumstances, and the marker yarn does not protrude from the space between the leather yarns even if it is repeatedly expanded and contracted by use, and the marker yarn can be formed only when the leather portion is damaged due to abrasion or the like. It is intended to provide a safety rope that can be exposed and can appropriately display the usable limit.

Means for Solving the Problems In the present invention, a marker yarn layer composed of yarns colored in an appropriate color is formed around a core portion formed by bundling a large number of yarns, and a marker yarn layer is formed around the marker yarn layer. In a safety rope formed by forming a part to form a strand and twisting or braiding a plurality of the strands, a non-stretchable bulky processed yarn is provided at least on the outermost part of the core part and the innermost part of the leather part. It is characterized by being arranged.

The present invention will be described below with reference to the drawings. The drawings show a safety rope 1 of the present invention, which is constructed by twisting three strands 2.

In the following description, a three-strand rope in which three strands 2 are twisted as shown in the drawings will be described.
It may be a twist of four or more strands,
The same applies to a so-called cross rope in which eight strands are braided.

A core portion 3 in which a large number of yarns are bundled is formed at the center of the strand 2. As the yarn forming the core portion 3, a filament yarn or a spun yarn of synthetic fiber yarn can be used.

The non-stretchable bulky processed yarn 4 is arranged at the outermost part of the core 3. The non-stretchable bulky yarn 4 is subjected to bulkiness, and the single fibers constituting the yarn are slightly crimped, but the degree of crimping is low and the crimp can be released even when tension is applied. It is a filament yarn that does not cause expansion and contraction, and has the appearance and texture of spun yarn. This type of yarn is commercially available under the trade names of NSB (Toray Industries, Inc.), HTT (Teijin Ltd.) and the like.

The core part 3 may be formed entirely of the non-stretchable bulky processed yarn 4, but at least the outermost yarn should be formed of the non-stretchable bulky processed yarn 4, and the inside thereof is particularly Not limited.

Next, a marker yarn layer 5 is formed around the core 3. The yarn forming the marker yarn layer 5 is colored in an appropriate color. The color is not particularly limited, but it is suitable to color it in a color that is conspicuous when exposed on the surface of the white rope, for example, red. However, in the case where it is used for an application that tends to stain red or brown, it may be better to color it in another color such as black or green.

Next, a skin portion 6 is formed around the marker yarn layer 5. The non-stretchable bulky processed yarn 4 is arranged in the innermost portion of the skin portion 6 as in the outermost portion of the core portion 3.

By the way, it is conceivable to arrange spun yarn of synthetic fiber at the outermost part of the core part 3 and the innermost part of the leather part 6, but the spun yarn has a large elongation, and when the rope is bent or repeatedly tensioned and stretched, the spun yarn is expanded. At the same time, the marking yarn is easily exposed on the rope surface, which is not suitable.

It is to be noted that the skin portion 6 can be formed only by the innermost portion with the non-stretchable bulky processed yarn 4 and the outside thereof with regular filament yarn or spun yarn. Preferably, it is formed by 4. The non-stretchable bulky processed yarn 4 is a filament yarn and has a texture similar to that of a spun yarn. Therefore, by forming the outermost part of the strand 2 with the non-stretchable bulky processed yarn 4, a safety rope is obtained. It has excellent abrasion resistance, good touch, non-slip and easy to handle.

Example 1 300 d of non-stretchable bulky yarn of polyester fiber (Taisan yarn manufactured by Teijin Ltd.) was twisted together with 4 strands, and further 3 strands were twisted into a yarn, and 16 yarns were bundled to form a core portion. .

Around the core portion, 18 yarns formed by twisting 3 red colored 5th polyester spun yarns were arranged to form a marker yarn layer.

Further, 10 yarns having the same structure as the yarn of the core portion were arranged around the labeled yarn layer to form a leather portion, and a strand was formed.

Three strands of this strand were twisted together to obtain a safety rope having a three-strand rope structure with a diameter of 18 mm.

Effect According to the present invention, since the non-stretchable bulky processed yarn 4 is arranged at the outermost part of the core part 3 and the innermost part of the leather part 6, the marker yarn layer 5 is a layer of the non-stretchable bulky processed yarn 4. It will be in a sandwiched state.

Therefore, when the rope 1 is repeatedly tensioned and stretched, the monofilaments in the non-stretchable bulky processed yarn 4 are entangled with each other, and the adjacent non-stretchable bulky processed yarns 4 are entangled with each other. The marker yarn layer 5 is held in between to prevent the yarn from moving.

Effect of the Invention Therefore, even if the safety rope 1 repeatedly expands and contracts to cause permanent elongation of the marker yarn, it is not held by the non-stretchable bulky processed yarn 4 and does not meander, but moves within the strand 2 or the leather. It does not protrude from between the yarns.

Therefore, there is no risk of erroneously recognizing the degree of damage to the safety rope 1, the damage detection function is excellent, and the strength is not reduced.

[Brief description of drawings]

 The drawing is a cross-sectional view of the safety rope of the present invention. 1 ... Safety rope, 2 ... Strand 3 ... Core part, 4 ... Non-stretchable bulky yarn 5 ... Marker yarn layer, 6 ... Leather part

Claims (1)

[Scope of utility model registration request] 1. A marker yarn layer (5) comprising a yarn colored in an appropriate color is formed around a core portion (3) formed by bundling a large number of yarns, and the marker yarn layer (5) is surrounded. In a safety rope (1) formed by forming a leather portion (6) on a strand to form a strand (2) and twisting or braiding a plurality of the strands (2), at least the core portion (3) Non-stretchable bulky yarn (4) on the outside and the innermost part of the leather part (6)
A safety rope characterized by having