JPS59197263A - Cable body for retreaving shock - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a shock-reducing cable body used, for example, as a so-called lifeline by workers working at heights.

[Technical background of the invention and its problems]

Generally, people who work in high places such as double-story buildings wear a safety belt and hook a rope connected to the safety belt to the steel frame of the work site. Ensure safety by securing the human body. Conventionally, nylon ropes have been mainly used for this type of application. The reason for this is that nylon rope has excellent elongation characteristics with respect to loads, so it absorbs the rapid and large energy that occurs in a fall through its elongation, alleviating the impact on the human body and at the same time preventing the rope from breaking unexpectedly. This is because it can be done.

Now, a nylon three-stripe rope with a thickness of 16 mm and a length of 5 m is used as a safety belt rope, a 75 kg human dummy is attached to this rope, and the dummy is lifted 1 m from the reference ground and allowed to fall with a drop of 6 m. The impact load on the rope and dummy was approximately 850 to 9. Furthermore, when the length of the rope was 7m and the drop was 8m, the load was measured to be approximately 870 Yu. Comparing the two, even if the head changes relatively significantly from 6 m to 8 m, there is no large difference in the impact load. This shows that when the rope is long from 5 m to 7 m, the increase in potential energy due to the change in head is almost absorbed by that difference. The longer the pickle and rope are, the more they stretch, which improves the shock absorption rate and makes them more desirable.

However, if the rope is too long, it will get in the way of the work and cause a big problem, and if the rope is shortened and a separate mechanical shock absorber is installed in the middle, the weight will increase significantly. Various restrictions are added to work operations, and costs are considerably increased.

[Purpose of the invention]

The present invention was made with attention to these points, and its purpose is to significantly improve the shock absorption rate without particularly increasing the length of use, and to reduce the weight. To provide a shock-reducing cable body which is hardly accompanied by an increase in cost or cost, can be handled conveniently, and can be produced at low cost.

[Summary of the invention]

The present invention involves folding a cable such as a fiber rope into a meandering or spiral shape, integrally covering this folded part with an elastic resin material, and using the resin material to extend the cable in the folded part. The elastic resin material is broken by the load applied between both ends of the cable, and the folded part is extended by intervening in each adjacent curve of the cable and connecting the cables to each other.

[Embodiments of the invention]

First, a first embodiment will be described with reference to FIGS. 1 to 3. In the figure, 1 is a nylon rope used as a cable, which has a thickness of 16 mm, a length of 6 m, and a tensile strength of 530.
It is composed of a 3-stripe structure weighing 0 kg. And, approximately 1 meter in the middle of this rope 1 is folded in a meandering manner.

Therefore, the apparent length l of rope 1 is approximately 6 tt
r 11 Z is there. Meandering Ilv;< h(q!:
The rope length is approximately 50 m, and the adjacent ropes 1 in this meandering portion 2 are bound together by binding threads 3 . For example, a rubber cord is used as the binding thread 3,
The ropes 1 are bound together in such a state that the contraction force becomes 25 to 9 by stretching the ends.

An elastic resin material 4, such as a two-component polyurethane resin (hardness 801i-), is injected into the outer periphery of the meandering portion 2 using a mold, and the meandering portion 2 is encapsulated by solidification. This resin material 4 covers the outer periphery of the meandering portion 2, and
It also densely intervenes in each adjacent curve of the rope 1 to completely fill the gap therebetween, thereby integrally connecting the adjacent rows f1 to each other.

The impact-reducing cable body configured as described above is used in actual use by connecting one end to a safety belt and hooking the other end to a steel frame or the like at a work site.

Now, when a 75 yuan human body dummy was attached to the rope 1 and the dummy was dropped at a height of 6 m, the impact load applied to the rope 1 and the dummy was approximately 450 kg. At this time, the elastic resin material 4 broke with cracks 5 occurring on both sides thereof as shown in FIG. 3, and the meandering portion 2 of the rope 1 was extended. As mentioned above, in the case of a simple rope, the impact load was 850 ky, but in this example it was 4.50 kg, which means that the impact load of 400 I<g was absorbed and reduced. become. The reason why the impact load is significantly reduced in this way is that firstly, due to the addition of the impact, the elastic resin material 4 causes cracks 5 that extend from both side edges toward the center from the lower end of the resin material 4 at different times. Second, each binding thread 3... is broken at the same time.
Furthermore, thirdly, the meandering portion 2 extends and the total length of the row f1 increases, and the load is no longer received by the extension of the entire length section.

As described above, in this example of actual performance flj, the impact load can be significantly alleviated, and therefore, the risk of damage to the human body can be reliably reduced. During normal use, the rope 1 does not fold in the middle and its total length does not become particularly long, so it can be handled conveniently without interfering with work.

Since it has a simple structure in which the meandering part 2 in the middle of the rope 1 is covered with an elastic resin material 4, it is lightweight and easy to handle, unlike the case where a mechanical shock absorber 117 is installed separately. The pros are that it is easy and inexpensive.

Figure '-4 shows a second embodiment in which the rope 1 is folded in a meandering manner in the middle, the width of the meandering is relatively thick, the number of meanderings is a little less than The ropes 1 are tied together at a plurality of places using binding threads 3, and the meandering portions 2 are covered with an elastic resin material 4 formed into a cylindrical shape. One part of the resin material 4 is drawn out into the upper blood part of the resin material 4, one part thereof is extended upwardly, the other part thereof is extended downwardly along the side surface of the resin material 4, and a part thereof is secured to the '64/Itr material 4 through the Chisoro. Furthermore, FIG. 5 shows a third embodiment in which the rope 1 is folded in the middle in a spiral shape, and the adjacent ropes 1 are tied together with a concluding thread 3 in this spiral portion 2.
It is covered with an elastic resin material 4.

Even in this third embodiment, the effects of the above-mentioned first skill kakumono and 1i-iJ can be obtained.

In addition, the binding thread 3 used in each of the above examples is as follows:
It acts as an element to absorb shock, and it also has the function of adjusting the meandering and spiral folding conditions to make it easier to mold the elastic resin. (Consider the hardness or folding density of rope 1, etc.)
E-sliding is not necessarily necessary, and it is also possible to omit it. The elastic resin material 4 is not limited to polyurethane resin, but synthetic rubber such as butyl rubber may also be used.

Incidentally, in each of the above embodiments, fiber ropes are used as an example of cables, but fiber ropes are not necessarily used; other examples include fiber belts, wire ropes, It may also be a chain or the like. When using a chain, it is difficult to expect a shock absorption effect due to its elongation, but it is equally possible to expect an absorption effect based on the destruction of the broken part of the resin material and the extension of that part. If you can do it, you will fully achieve your intended purpose. The first shock absorbing rope body of the present invention is n
i; Not only for one-time use for the safety of office workers;
For example, it can also be used as a mooring line for ships.

〔Effect of the invention〕

As explained above, according to the present invention, the rope is folded in a spiral shape in the middle of the cable, and this folded part is integrally covered with an elastic resin material. Then, the resin material is interposed between adjacent parts of the cable in the folded part, and the resin material is bonded to each other, and the load applied between both ends of the cable causes the resin material to break. 1Iilj +, since the above-mentioned folded part is extended to absorb and soften the impact, the absorption rate of *j impact can be improved to that of the dog 11ii without particularly increasing the length of the cable in use. '71. ! , S'+ and cost threads/dogs are hardly involved (therefore, it can be handled easily and produced at a low cost), which is a practical effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the first embodiment of the present invention, FIG. 2 is a cross-sectional view, FIG. 3 is a front view showing the progress of fracture of the elastic resin material in the same embodiment, and FIG. 4 is a main view of the present invention. FIG. 5 is a sectional view showing the second embodiment of the invention, and FIG. 5 is a sectional view showing the third embodiment. 1... Fiber rope (rope) 4... Elastic resin rope Applicant's agent Patent attorney Takehiko Suzue 632 Figure 3 Figure 5 Figure 4

Claims (1)

[Claims] The cable is folded in a meandering or spiral shape in the middle, the folded part is integrally covered with an elastic resin material, and the resin material is placed between each adjacent space of the cable in the folded part. A cable body for impact mitigation, characterized in that the elastic resin material is broken by the load applied between both ends of the cable, and the folded part is extended by intervening the cables and connecting them to each other. .