JPH0233798Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety belt used to prevent falls during work at heights.

The belts currently used as safety belts for work at heights are woven belts such as plain weave and twill weave, but unlike safety belts for transportation vehicles such as automobiles, they are used in electrical work, construction, shipbuilding, etc. As a result, the use of the belt is complicated and must be handled roughly.As a result, the smooth belt loses its shape with frequent use, and becomes thin and string-like in the width direction of the belt. The shortcomings are that the elasticity is lost in the longitudinal direction and the pressure exerted on the worker increases, and the shock to the human body increases in the event of a fall, resulting in an extremely dangerous situation. was. In addition, since the position where the buckle is fastened is almost the same as long as the same worker uses it, only that part becomes fatigued, resulting in thread breakage, fraying, etc. In order to prevent these problems, the belt is treated with resin after weaving to increase its hardness, which is somewhat effective, but due to the rigidity of the process, it becomes difficult to handle when new, and the edges break. The ears on the end surface often come into contact with the body and cause pain, and this resin processing does not improve the material, and the reality is that its effectiveness diminishes with frequency of use and over time. be.

The present invention eliminates such drawbacks of conventional belts and provides a belt that maintains its elasticity over a long period of time.

The present invention is a resin film 1 that shares the elasticity and viscosity shown in FIGS. 1 and 2, and has particularly excellent viscosity.
The folded products are arranged in the center of the cross section of the belt and woven with warp threads 2, weft threads 3, and knotted threads 4, and its structure is as follows.

Belt composition Warp Thread Nylon filament yarn 840 denier x 387 pieces Marking thread Nylon filament yarn (original colored thread) 840 denier x 24 pieces Core film P/P film (equivalent to 3000 denier) x 32 pieces Knotting thread Nylon filament yarn 840 denier x 64 pieces Weft Nylon filament yarn 1260 denier x 22 pieces / 25mm resin film Material Polypropylene Dimensions Width 18mm Thickness 0.02mm Folding 10 times to finish width 2mm thickness 0.25mm Weaving structure Flat double cored Woven Finished dimensions Width 50mm Thickness 2.1mm Physical properties Strength 3325Kg Elongation 20% (at 1 ton load) 36% (at break) The belt of the present invention constructed as described above is more durable than, for example, a homogeneous material due to the mixed weaving of the resin film 1. When compared with a monofilament yarn woven in the same cross-sectional area, as shown in FIG. 3, there is a clear difference in elasticity and viscosity. Third
In the figure, A-B-C-D is a curve of a belt mixed with film 1, and A'-B'-C'-D' is a curve of a belt mixed with monofilaments having the same cross-sectional area. In other words, a belt in which monofilament yarn is mixed in the core is too rigid and has poor viscosity even if it has elasticity. On the other hand, if a film is used, it will deform in response to the external force applied to the belt, but once the external force is removed, it will recover due to its elasticity and viscosity. By using a belt woven with this resin film 1 as a safety belt, it becomes a soft and resilient belt with a natural texture, which means it is moderately thick, fits well around the waist, and does not buckle. Due to its good resilience against tightening, it does not become fluffy or
This results in a belt that is less likely to fray.

Furthermore, when the belt of the present invention is compared with a conventional belt having the configuration shown below, it is superior in its restorability, and the comparison is shown in FIG.

Composition of conventional belt Warp Thread Nylon filament yarn 840 denier x 387 pieces Marking thread Nylon filament yarn (original colored thread) 840 denier x 24 pieces Core thread Polyester filament yarn 1000 denier x 96 pieces Knotting thread Nylon filament yarn 840 denier x 64 pieces Weft Yarn Nylon filament yarn 1260 denier x 22 pieces/25mm Weaving structure Plain double weave with core Finished dimensions Width 50mm Thickness 2.1mm Physical properties Strength 3309Kg Elongation 22% (at 1 ton load) 38% (at break) Figure 4 In the figure, the solid line is the belt according to the embodiment of the present invention, and the broken line is the conventional belt.

The experimental method was to apply the same load for 2 minutes to both circularly bent belts of the same size to cause 100% deformation (completely collapse to a horizontal state), then remove the weight at the same time, and measure the restored state with elasticity. and viscosity were measured.

As a result, the example of the present invention in which resin film 1 was inserted had better repulsion (recovery) immediately after weight removal;
It also has excellent recovery power (viscosity) over time.

From the above, by using a belt with synthetic resin film 1 mixed in the center of the cross section as a safety belt, the process of resin processing on the surface is not necessary, and therefore it has a good texture, is supple, and has a moderate It is possible to provide a belt that has a high repulsion property, provides good contact with the waist, and is safe even in the event of a fall because its elasticity is less likely to deteriorate. Moreover, by eliminating the need for resin processing, there is an economical effect that the cost is reduced accordingly and that sewing machine processing when sewing buckles and the like becomes easier.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the present invention. FIG. 2 is a longitudinal sectional view of this embodiment. FIG. 3 is a graph comparing the state of the belt woven with the monofilament yarn of this example after loading and unloading. FIG. 4 is a graph comparing the states of this example and the conventional product after loading and unloading. In the figure, 1 is a synthetic resin film, 2 is a warp, 3 is a weft, and 4 is a knotted yarn.

Claims (1)

[Scope of utility model registration request] This belt for a safety belt is made by integrally weaving a synthetic resin film 1 which is bent into a weavable state and inserted into the center of the cross section of a narrow fiber cloth.