JPH0418609Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a safety net that prevents skiers from being killed or injured due to skiers colliding with trees or falling off the course at ski resorts. It is.

(Prior art) At conventional ski resorts, collisions between skiers,
In order to prevent accidents from falling, trees that grow naturally around the course are used, and their trunks are wrapped with foam material, or nets are stretched over stakes or other supports that are set upright in the snow. However, the former is used to provide a cushioning effect when a skier collides with a tree, and the latter is simply used to indicate the width and direction of the downhill course and to separate people other than skiers from the course, so it is important to protect skiers. This was a very passive and inadequate method.

(Problem that the invention attempts to solve) The safety nets traditionally used at ski resorts are
Due to its structure, the elongation of the net fabric is relatively low, so it has poor cushioning properties, and therefore skiers can collide with trees, fall, or fall off the course when skiers are going down the course at a very high speed. are unable to withstand the large impact caused by these accidents, resulting in death or injury.

Therefore, when these accidents occur, the impact is so great that the safety nets are seriously damaged, and as a countermeasure, efforts are now being made to strengthen the materials that make up the safety nets.

In addition, conditions differ depending on the condition of the ski course, but generally speaking, the height of the safety net is required to be around 5 meters in order to protect skiers safely. Trees that grow wild around the site or stakes raised upright from the snow,
In order to stretch the net onto a support such as a pipe, it is necessary for a worker to climb up to a height of about 6 to 7 meters, which makes it difficult to install the net.

Furthermore, ski resorts were originally built halfway up or near the foot of a mountain, and as a result, their courses were topographically hilly, had long nets, and were limited to the winter season. Therefore, the shape of the net must be adjusted according to the terrain.
In addition to the need to adjust the size, it was difficult to install the nets on site because the ground was covered with snow, and the installation work was dangerous.

(Means for Solving the Problems) In order to solve the above problems, the present invention is based on trees that grow naturally around the course, or stakes, pipes, etc. that are set upright in the snow in advance, and are strung at appropriate heights. Snap springs are inserted into the wire rope, and grab rings are attached at regular intervals to the upper side of the reinforcing rope around the net, and then hanging ropes are inserted in a lightning bolt shape between the snap springs and the grab rings to create an integrated structure. It is something.

The width of the safety net of this invention is as follows:
Because the size is often limited to an appropriate size for convenience in manufacturing, transportation, and installation work, it is possible to arrange fasteners on the periphery of the net divided into appropriate sizes in advance in the height direction. The safety net can be easily and rationally installed and removed at a ski resort site.

(Function) Since the present invention has the above-mentioned structure, it is easy and inexpensive to manufacture, and since it is foldable,
In addition to being convenient for transportation and storage, in the event that a skier crashes into the safety net due to an accident such as falling while descending from above the course after the safety net of the present invention is stretched out and hung at a designated location at the ski resort,
The maximum kinetic energy generated by the downhill speed can reach approximately 3 tons or more, so if the net's cushioning properties are poor, the attenuation of the deceleration G is small, resulting in death or injury to the colliding skier. It is a matter of fact.

In order to prevent or reduce the risk of death or injury caused by skier collisions, it is necessary to provide a safety net with cushioning properties. Although it is possible to absorb some impact, that is, reduce the deceleration G, depending on the type of fiber, the twist structure of the net threads, the knot shape, etc., there is a limit to the amount of deformation of the net, and it is difficult to ensure the safety of collision skiers. Since the deceleration G is too large, it is impossible to completely prevent accidents resulting in death or injury.

The structure of the safety net of the present invention is such that a suspension rope is inserted between the wire rope and the net through a snap ring and a bra ring, respectively, and the net is suspended in a lightning bolt shape. The rope is pulled toward the net collision site in proportion to the magnitude of the impact, that is, the degree of deceleration G, and the upper edge of the net is pulled downward, so the deformation of the net fabric near the net collision site increases. At the same time, the load applied to the net is propagated along the entire length of the hanging rope,
This will disperse the impact to other parts of the net, thus instantly reducing the impact on the colliding skier.
It is possible to reasonably and completely prevent accidents resulting in death or injury.

The method for deploying the safety net of this invention is to first stretch a wire rope almost horizontally at a predetermined height on a support such as a tree, pile, or pipe that has been made to stand upright in the snow, and then add the required quantity of wire rope to the wire rope. Then, insert the suspension rope through the snap spring. Since the work up to this stage involves work at a height of 5 to 6 meters above the ground, it is preferable to complete this work in advance when the scaffolding is firm before snowfall, for example between spring and autumn.

The following work can be easily done even on snowy surfaces, and the work continues by connecting the hanging rope between the snap springs fitted into the wire rope,
Using a hook rod, etc., pull down the rope one by one to a position close to the ground, and insert the upper edge reinforcing rope of the net and the grab ring at regular intervals through the lowered hanging rope.

After a predetermined number of grapplings have been installed, by pulling both ends of the hanging rope, the net will be pulled upwards and suspended at a predetermined height below the wire rope stretched between the supports. It is.

In addition, the lower edge of the net is embedded in the snow or stakes are driven into the snow to secure it, and both edges of the net are tied and fixed to supports such as trees, stakes, pipes, etc. at appropriate intervals, making it possible to secure the safety net of this invention. The expansion and suspension work will be completed.

Particularly when pulling up a long net, a large amount of force is required to pull both ends of the hanging rope, but in the case of the present invention, this work can be done easily and quickly by using a portable power winch, etc. It's something you can do with your time.

As mentioned above, the net that has been further divided is
If fasteners are placed on both the left and right edges of the net in advance, the work of connecting the net can be done easily and rationally, even when the length is several hundred meters, for example.

(Example) Fig. 1 is a schematic diagram showing an example of the suspended state of the safety net of the present invention, and Figs. 2 and 3 are a front view and a side view, respectively, showing the deformed state of the safety net of the present invention when a skier collides with the net. Figures 4A and 4B are schematic diagrams of a snap ring and a grab ring, respectively, which are the accessory components of the safety net of the present invention.

To deploy the safety net of this invention, first stretch a wire rope almost horizontally to a predetermined height of a support such as a tree, stake, or pipe that has been raised upright during snowfall, and then Fit the appropriate number of snap springs, and then insert the hanging rope through the snap springs. Since the work up to this stage involves work at a height of 5 to 6 meters above the ground, it is preferable to complete this work in advance when the scaffolding is firm before snowfall, for example between spring and autumn.
The subsequent work can be easily done even on a snowy surface, and the work continues by connecting the hanging rope between the snap springs that are inserted into the wire rope,
The hanging rope is successively lowered to a position close to the ground using a hook rod or the like, and grab rings attached at regular intervals to the upper edge of the reinforcing rope of the net are inserted into the hanging rope.

After a predetermined number of grab rings have been installed, pulling both ends of the hanging rope will pull the net upwards and suspend it at a predetermined height below the wire rope stretched between the supports. Become.

In addition, the lower edge of the net is embedded in the snow or stakes are driven into the snow to secure it in place, and both edges of the net are tied and fixed to supports such as trees, stakes, pipes, etc. at appropriate intervals to ensure safety with this invention. The work to stretch and hang the net will be completed.

Particularly when pulling up a long net, a large amount of force is required to pull both ends of the hanging rope, but in the case of the present invention, this work can be done by using a portable power winch, etc. It can be done easily and in a short time.

Furthermore, as mentioned above, if fasteners are placed on both the left and right edges of the divided nets in advance, the work of connecting the nets can be done easily and rationally, even if the nets are several hundred meters long. You can get it.

In this embodiment, a wire rope 2 is stretched at a predetermined height of 6 to 7 m on a support 1 such as a tree that grows naturally around the course of a ski resort or a pile or pipe that is erected in advance during snowfall, and the wire rope After the required number of snap rings 6 are slidably fitted into the snap spring 2, the hanging rope 5 is inserted into the snap spring 6 in the same manner, and the hanging rope 5 is attached to the upper edge of the reinforcing rope 4 on the periphery of the mesh fabric 3. It is inserted and attached to grab rings 7 attached at regular intervals so as to form a lightning bolt shape.

Further, the mesh fabric 3, which is the main body of the safety net A of the present invention, preferably has a square mesh pattern in order to improve dimensional stability, but if the ski course has good undulations, a diamond mesh pattern may be used.

Nets A and A' may be connected by fastening with a string or wire (not shown), but as mentioned above, fasteners should be attached to both the left and right edges of nets A and A' in advance. With this arrangement, the connection and fixation of nets A and A' can be accomplished more easily and rationally.

The snap ring 6 and grab ring 7, which are the attached components of the safety net A of the present invention, have a shape as shown in FIG. 4, and are normally closed by a spring (not shown). It has portions 6a and 7a.

(Effects of the invention) The invention has the above-mentioned structure and operation, and the wire rope 2 and the safety net A are fitted and inserted through the vertically slidable snap ring 6 and grab ring 7 by means of the hanging rope 5, respectively. By attaching and suspending the net in a lightning-bolt shape, the impact of the skier 9 colliding with the safety net A on a local part of the net, that is, the deceleration G, is absorbed by the main body net of the safety net A by pulling in the suspension rope 5. It is possible and easy to increase the deformation of the ground 3, disperse the transmission layer and other parts of the net 3 over the entire length of the suspension rope 5, and instantly reduce the impact, that is, the deceleration G exerted on the colliding skier. It is.

Due to the above-mentioned structure of the present invention, a distance of approximately 4 m is required from the time the skier 9 traveling at a speed of 70 to 80 km/h comes into contact with the safety net A until the skier comes to an almost complete stop. Since the effect is extremely large, if the skier 9 collides at the above speed, the impact applied to the skier 9, that is, the deceleration G
This makes it possible to keep the damage within a range that does not result in death or injury.

In addition, if the necessary number of snap rings 6 are fitted in advance to the stretched wire rope 5, and the hanging ropes 5 are also inserted through the snap springs 6, the safety net A of the present invention can be stretched easily and efficiently on the ground. It is something that can be done.

Furthermore, the many divided safety nets A and safety nets A' may be connected by using strings, wires (not shown), etc., but fasteners 8 are arranged in advance on both the left and right edges of the net 3. If this is done, the work of connecting safety nets A and A' can be accomplished with extremely high efficiency.

In addition, when the ski season is over and you want to remove the safety net A of this invention, first loosen the hanging rope 5,
By lowering the entire safety net A to a height close to the ground, not only can safety net A and safety net A' be easily separated by ground workers only, but also the safety net can be easily separated during the period of use. Maintenance and inspection can also be carried out easily.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing an example of the use of the ski resort safety net of the present invention, Figs. 2 and 3 are a front view and a side view showing skier collision conditions, respectively, and Fig. 4 shows the attached components snap spring and FIG. 3 is a front view of the grab ring. DESCRIPTION OF SYMBOLS 1... Support column, 2... Wire rope, 3... Net body, 4... Reinforcement rope, 5... Hanging rope, 6... Snatch spring, 6a... Opening of snap spring, 7... Grab ring, 7a... ... Grab ring opening, 8... Fastener, 9...
Skier, A, A'...safety net.

Claims (1)

[Scope of utility model registration request] A wire rope is installed on the support, and a snap ring is inserted into the wire rope, and a hanging rope is inserted in a lightning bolt shape between the grab rings tied at regular intervals to the upper edge of the net and the above-mentioned snap spring. A ski resort safety net characterized by a hanging net.