JPS59197264A - 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] ￥子 [Technical layer of the invention] [Technical background of the invention and its problems] Generally, people who work in high places such as high-rise buildings wear safety belts and The connecting ropes are anchored to a steel frame at the work site, so that if a person accidentally falls from a height, the rope will secure the person's body and ensure safety.

Traditionally, nylon ropes have been primarily used for this type of application. The reason for this is that nylon rope has a very strong elongation characteristic under load, and therefore, the rapid and large energy that occurs in a fall is absorbed by its elongation, reducing the impact on the human body, and at the same time preventing the rope from breaking unexpectedly. This is because it is possible.

A nylon three-stroke rope with a thickness of 16 mm and a length of 5 m was used as a safety belt rope, a 75 kg human dummy was attached to this rope, and the dummy was lifted 1 m from an elevated reference point and dropped to a height of 6 m. The impact load on the rope and dummy was approximately 850 kg. Furthermore, when the length of the rope was Vm and the drop was 8m, the load was measured to be approximately 870kg. Comparing the two, even if the drop changes relatively significantly from 6 m to 8 m, there is not much 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 rope is, the more it stretches, which improves its shock absorption rate, making it 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 increase considerably.

[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 stretches out the middle of a cable, such as a fiber rope, in a root shape, and connects both ends by locking both ends of this loop part to an annular body, thereby reducing the load applied between both ends of the cable. The present invention is characterized in that the ring body is broken and the loop portion is extended.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a nylon rope used as a cable, which has a thickness of 16 ropes and a length of 6 meters.

It has a three-strike structure with a tensile strength of 5300 to 9. A length of 1 m in the middle of this rope 1 is stretched out in the form of a loop. Therefore, the apparent length of the rope 1 is approximately 5 m.

Both ends 2a, 2a of the loop portion 2 are respectively locked to a ring body 3, and thereby both ends 2a, 2th are connected via the ring body 3.

As shown in FIG. 2, the toroidal body 3 is made by inserting a nylon fiber bundle 5 through the center of an outer cover layer 4 made of an elastic resin material such as polyurethane resin, and is made in advance so that it will break under a predetermined load. It is composed of

The impact-mitigating rope body constructed in this manner 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 75kg human body dummy was attached to a rope rope and the rope was dropped at a height of 6m, the impact load on the Loaf '7 and the dummy was measured to be approximately 500-.

At this time, the toroidal body 3 was broken and the loop portion 2 of the roots 1 was extended. As mentioned above, in the case of a simple rope, the impact load was 850 kg, but in this example, the impact load was 500 kg, which means that the impact load of 350 kg was absorbed and reduced. The reason why the impact load is greatly reduced is due to the energy required when the ring body 3 breaks, and the first stage of impact absorption is achieved first, and then the loop portion 2 is expanded and the loaf 01 is This is because the overall length increases, and the second stage of shock absorption is achieved due to the elongation burden borne by the entire length section.

As described above, in this embodiment, the impact load can be significantly reduced, and therefore, the risk of damage to the human body can be reliably reduced. During normal use, the middle part of the roots 1 is stretched out in a loop shape, so if the total length is particularly long, there is no limit, so it is convenient to use without interfering with work. can be handled. Since it has a simple structure in which a loop part 2 is formed in the middle of the roots 1 and its both ends 2a, 2a are connected by an annular body 3, it is different from the case where a mechanical shock absorber is installed separately. Lightweight and easy to handle.
It also has the advantage of being inexpensive.

In addition, in the above-mentioned embodiment, explanation was given using a fiber rope as an example, but the rope is not necessarily limited to fiber rope, and may also be used, for example, a fiber belt, wire roots, etc.
Furthermore, a chain or the like may be used. When using a chain, it is difficult to expect a shock absorption effect due to its elongation, but it is possible to expect a similar absorption effect based on the destruction of the torus and the extension of that part. The objectives of the period will be fully achieved. The impact-reducing rope body of the present invention is not limited to being used for the safety of workers at heights, but can also be used as a mooring rope for ships, for example.

〔Effect of the invention〕

As explained above, according to the present invention, the middle part of the cable is stretched out in a loop shape, both ends of this loop portion are respectively locked to the annular body, and the both ends are connected, and the load applied between the both ends of the cable is The above-mentioned ring pier is broken and the above-mentioned loop section is extended to absorb and alleviate shock, so the shock absorption rate is greatly improved without particularly increasing the length of the cable in use. It can be easily handled, with almost no increase in weight or cost, and can be handled conveniently.
It also has two practical effects: it can be produced at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
It is a sectional view taken along the line ■-■ in the figure.

Claims (1)

[Claims] The middle part of the cable is stretched out in a loop shape, both ends of this loop portion are locked to the ring body, and the two ends are connected, and the load applied between both ends of the cable causes the ring body to break. A shock-reducing rope body, characterized in that the loop portion is extended by the force of the shock absorber.