JPH0517079Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention of this application can be incorporated into safety belts used at high places such as power transmission towers and construction sites, or moving ropes for fall prevention, and can be used to prevent the rope from falling in the event of a fall. This invention relates to a fall shock absorber that alleviates the impact load on a human body held back by a fall.

(Prior art and problems) Conventionally used drop shock absorbers are made by polymerizing a predetermined portion of a narrow woven belt in its length direction and sewing it into multiple strips with sewing thread. When weaving the belt, the two belts are configured so that they overlap for a predetermined length and are integrated, so that the drop impact load applied between the attachment parts at both ends of the overlapped part is prevented from disassociating or cutting the threads at the overlapped part. As time passed, the absorption was relaxed.

In other words, as shown in Fig. 5, the attachment parts 1, 1 at both ends of the belt are divided into the human body side of the safety belt and fall prevention moving rope, and the hook side rope which becomes the locking part. The tearing force applied to the part causes the suture thread or woven thread to be separated and cut, thereby absorbing and relieving the impact load.
This belt overlapping part is usually covered with an outer cover 2 made of a synthetic resin sheet, etc., in order to prevent natural deterioration of the sewing threads and woven threads due to ultraviolet rays, wind and rain, etc., and to prevent wear due to contact with structures, etc. However, if you use it for a long period of time, there are times when you feel like you are about to lose your footing and attach yourself to a structure in a hurry, even if you do not fall. However, when transporting safety belts, moving ropes, etc. along with other materials to the site, heavy objects may be loaded onto the floor, and we have seen people pulling on the ropes in an attempt to pull them out. It was also observed that if the stitching to the attachment part of the subject was torn, or if even stronger force was applied, the first few threads of the suture at the overlapping part would come apart. Also, outer cover 2
If it is formed by resin molding and has a capsule shape that can be inserted and fitted from both mounting parts, the fitting part may loosen and raindrops may get in.
If it comes off, it is difficult to fold the long overlapping part and store it in a compact capsule, and if it is used as is, the natural deterioration and abrasion described above will be accelerated, and sometimes the overlapping part will protrude into the structure. It was also conceivable that the polymerization part would get caught and an unexpected situation would occur. Furthermore, if the first few threads of the overlapping portion 3 are separated and a state as shown in FIG. 4 occurs, the initial load will be high in the event of a fall. In other words, it is preferable for the shock waveform when using a buffer to be in the state shown in Figure 6 A, but if the first few threads are in the state shown in Figure 4, the few threads that are not cut completely and are sagging. Load is applied to all the threads,
The initial load is significantly higher than when cutting normally from the first seam. As a result, the impact waveform becomes as shown in FIG. 6B, and ideal impact force absorption and relaxation cannot be achieved. In other words, if the so-called initial impact load becomes high, if there is a flaw in the rope continuous to the shock absorber, it is possible that the high initial load will cause the rope to break at that part, even if this is not the case. However, the shock to the human body was considerable, and even if the fall could be prevented, damage to internal organs remained. In addition, considering the above situation, if the outer cover is constructed with strength, the initial load will increase due to the resistance of the outer cover until the overlapping part starts to dissociate and cut, causing the same problem as described above. It was impossible to achieve the goal.

(Means and effects for solving the problems) In order to solve the above problems, the present invention bridges the connecting members 4 made of a predetermined material and with a predetermined strength across the overlapping portion 3 so that the connection member 4 can be used under low load. This prevents the overlapping portion from disassociating and breaking, and also eliminates the need to set the strength of the outer cover 2 in a difficult manner, thereby solving the various problems of the prior art. In other words, by configuring the connecting member 4 with canvas, resin sheet, PVC leather, etc., a cloth-like strip whose strength can be set, or a string, the falling impact applied before the overlapping portion 3 is sewn or the woven material is separated and cut. It protects the overlapping part 3 from various tensile forces other than loads, and in the event of a fall, sewing, unraveling, and cutting of the weave can be performed according to the settings, making it possible to obtain a stable shock absorption waveform. It is possible.

(Example) In one embodiment of the present invention, a resin sheet is cut into a connecting member 4 so as to have the same width as or less than the narrow woven belt forming the cushioning body, and the overlapping portion 3 is cut into a connecting member 4 so as to have the same width as the narrow woven belt forming the cushioning body.
The connecting member 4 is attached by sewing both ends at a predetermined position between the mounting parts 1 which are the extension ends of both sides. The connecting member 4 can be formed in a short fence shape with a narrow section 5 in the center in the longitudinal direction, or by punching a long hole 6, so that both ends can be sewn more widely and strongly to the belt, and the initial load can be adjusted in the middle, so that the initial load can be easily changed at any time. Normally, it is preferable to set this strength so that it breaks at 100 to 200 kgf. The tongue overlap part is dissociated and cut.
Since the load is between about 300 and 500 kgf, setting the initial load to 100 to 200 kgf allows smooth shock absorption. Also, as another embodiment, it is easy to use a flexible string-shaped material with little stretch, such as a resin string, as the connecting member 4 and connect it between the rings 7 of the mounting parts 1, 1 at both ends.

(Effects of the invention) The shock absorber of the present invention having the above structure can cause the overlapping portion 3 to dissociate under normal tearing force.
There is no cutting or rupture of the outer cover 2, thereby achieving the ideal drop impact load reduction, and providing a long-term stable buffering effect, which also has economic effects.
It has many advantages.

[Brief explanation of the drawing]

Fig. 1 is a side view of the present invention, Fig. 2 is a partially cutaway front view of the present invention, Fig. 3 is a front view showing another embodiment of the connecting member, and Fig. 4 is the initial number of overlapping parts. Fig. 5 is a diagram showing the set-up of the present invention with a part cut away, and Fig. 6 is a waveform diagram of the drop impact. Symbols in the diagram: 1...Both end attachment parts, 5...Narrow width part, 2...Outer cover, 6...Elongated hole, 3...Overlapping part,
7... Ring, 4... Connecting member.

Claims (1)

[Scope of utility model registration request] In a cushioning body constructed by covering a narrow woven belt with an overlapping part by integrally sewing or weaving in the middle part, both ends in the tearing direction are left as attachment parts and covered with an outer covering, bridging the two sides of the overlapping part. A fall impact buffer comprising a connecting member.