JPH0321277A - Artificial slope for ski - Google Patents

Abstract

PURPOSE:To obtain an artificial slope providing the feel of the same descent and slalom as on the snow by arranging numberless large ball bodies and middle ball bodies, disposing small ball bodies between the ball bodies, and giving some resistance to the descending of a ski on the large ball bodies by the middle ball bodies and small ball bodies. CONSTITUTION:A descending sheet S is mainly formed of a descending base plate 2 and a press plate 3, in which numberless large ball bodies 4, middle ball bodies 4a, and small ball bodies 5 are combined. Recessed parts 6, 6a, 7 to which the large ball bodies 4, middle ball bodies 4a and small ball bodies 5 are fitted are formed on the upper surface of the descending base plate 2. Their upper ends are lowered in the order of the large ball bodies, 4, middle ball bodies 4a, and small ball bodies 5, and as far as a schuss is made, a ski is put on only the large ball bodies 4 most frictionless to slalom, providing a high speed schuss. When the course is changed to descend obliquely, the ski is put on the middle ball bodies 4a and small ball bodies 5 much frictional to slalom to restrain the speed, so that the course change can be easily conducted in the same way as on the snow surface. In traversing, the speed is properly restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an artificial slope for practicing downhill skiing.

[Conventional technology]

Conventionally, using artificial snow for the downhill surface of an artificial slope requires a large amount of money for production of artificial snow, air conditioning equipment, etc., so artificial turf slopes have become the mainstream for downhill skiing practice. .

Artificial turf slopes are made by stacking artificial turf sheets on a slope, and the sheets have soft or semi-hard plastic fibers planted as grass, so when you ski on top of them, the skis and In between, it provided the glide and cushioning necessary for downhill skiing, so I was able to slide down smoothly on it with my skis on.

[Problem to be solved by the invention]

However, on slopes with artificial turf, the skis slide down against the sliding friction between the grass and the grass, which generates a high amount of frictional heat that cannot be ignored.The frictional heat causes the grass to melt and stick to the skis. Especially in places where there is a lot of downhill skiing.
Artificial turf gets damaged prematurely and must be replaced, and melting of the turf reduces ski speed.
There was a problem in that the conditions were significantly different from the snow surface, making it impossible to obtain the desired rotation and speed.

Regarding this point, since the snow surface melts thinly due to frictional heat, and the friction in contact with that thin film is minute,
Skiing allows you to obtain a very high speed from the beginning, but artificial turf has many effects that restrict the speed of skiing, and increasing the slope in order to obtain high speed causes the problem of damage to the turf as mentioned above. Ta.

In view of the above-mentioned circumstances, this invention was developed to create an artificial slope in which the skis slide down by rolling friction, so there is no heat generation due to friction during the skiing, and the feeling of downhill and rotation is almost the same as skiing down on snow. The purpose is to provide the following. [Means for Solving the Problem] After conducting various experiments, the inventor discovered that if a large number of balls are rotatably held on the skiing surface, rolling friction can be obtained when skiing downhill. They discovered that if they had a certain arrangement of large balls, medium balls, and small balls, they could obtain a downhill surface that was very similar in quality to snow, and they were able to complete this invention.

That is, the configuration of the present invention to achieve the above object is to arrange a number of large and medium spheres that support skis alternately or in an appropriate arrangement on a downhill seat placed on a downhill slope. , small balls are arranged between the upper, lower, left and right sides of the spheres, and a recess is formed in the downhill seat to hold the spheres and the small spheres so that they can rotate freely, and the skis on the large sphere are arranged. The gist of this is that the medium and small spheres provide some resistance when sliding downhill.

[For production]

Since the artificial slope for skiing is configured as described above, when the ski is advanced on the slope, the force of the ski trying to descend in the direction of the slope causes the sphere to rotate, and due to this rotation there is a gap between the ski and the sphere. Almost no sliding friction occurs, and the friction between them is rolling friction, so the ski quickly increases its speed and slides downhill. This short acceleration time makes it suitable for artificial slopes with short downhill distances, and especially for indoor slopes where the distance is limited. Further, since no slipping occurs on the contact surface between the ski and the sphere or small ball, no frictional heat is generated on the contact surface between the ski, the ball, or the small ball. Although slipping occurs between the concave surface and the spherical surface, since the time is instantaneous, frictional heat sufficient to damage the sphere or the concave portion is not generated at that time.

Since the sphere and the small ball rotate freely, the downhill direction of the ski can be changed freely.

In addition, since the medium and small spheres are configured to provide some resistance to skis sliding down on the large sphere, speed acceleration is moderately suppressed, making it easier to ski down the snow surface. You will get a feeling that is not much different.

In order to configure the medium sphere and small sphere to act as resistance, it is necessary to make them of a rubber-like plastic with high friction, to make the surface rough, or to improve their adhesion to the inner circumferential surface of the recess. There are ways to make it better. [Example] Next, this invention will be explained based on drawings of an example. Figures 1 to 6 show an example of an outdoor ski slope. A slope of a hill, park, etc. is used to form a downhill slope 1, and 81 layers of downhill seats S are placed on top of it. However, it is also possible to construct a downhill ramp using the framework. The downhill seat S mainly consists of a downhill base plate 2 and a push plate 3, to which numerous large spheres 4, medium spheres 4a, and small spheres 5 are combined.

The downhill board 2 is. It is made of hard plastic,
It includes recesses 6, 6a which are partially hemispherically recessed so that the large sphere 4, medium sphere 4a, and small sphere 5 fit into the upper surface.
7, the spherical recesses 6, 6a are arranged in an angular direction of 45 degrees, and the small spherical recesses 7 are arranged in the middle between the upper, lower, left, and right sides of each spherical recess 6, 6a. It is. Therefore, the small ball recesses 7 are also arranged diagonally at an angle of 45 degrees. Further, a circular tenon hole 8 is provided diagonally in the middle of each spherical recess 6, 6a.

Regarding the arrangement of the large spheres 4 and the medium spheres 4a, as shown in FIG. 2, the medium spheres 4a are arranged diagonally, vertically, horizontally, and vertically.

The sphere recesses 6, 6a are provided with a receiving part 9 on the bottom on which the spheres 4, 4a are placed.
4a and the inner peripheral surfaces of the recesses 6, 6a have a clearance of 10
has. The receiving part 9 has a concave surface 9a into which a part of the spheres 4, 4a fit, and the sphere 4 is formed only by this small area.
, 4a slide, there is little frictional resistance for rotation of the spheres 4, 4a, and the inner peripheral surfaces of the recesses 6, 6a only serve as guides, so the spheres 4, 4a rotate smoothly.

However, among the spheres 4 and 4a, the medium sphere 4a is made of semi-hard plastic with high friction, so its rotational frictional resistance is relatively large, and its rotation is suppressed more than that of the large sphere 4. Further, since the small ball recess 7 has a shape in which the small ball 5 is closely fitted, the frictional resistance against rotation thereof is relatively large, and rotation is similarly suppressed.

The push plate 3 is made of semi-hard synthetic rubber and has a thick wall, and has punched holes 11. corresponding to the recesses 6, 6a, 7 of the sliding board l. 12
11. By forming the inner surface of the recess 12 to be connected to a certain imaginary sphere, the openings of the recesses 6, 6a, and 7 are made narrower than the apertures between them.

However, since the virtual sphere is set to be one size larger than the spheres 4, 4a and the small ball 5, there is also a clearance 14 between the inner surfaces of the holes 11, 12 and the spheres 4, 4a and the small ball 5.
, 15.

In addition, a tenon 16 is provided on the push plate 3 to protrude in correspondence with the tenon hole 8 of the sliding board 2, and the vicinity of the tip of the tenon l6 is shaped like a bulge, so that it does not easily come out from the tenon hole 8. To explain in more detail the relationship between the six large spheres 4, medium spheres 4a, and small spheres 5, which are connected as shown in FIG. The upper end is lower in the order of 4a and small ball 5. Therefore, when skiing normally straight downhill, the skis rest only on the large sphere 4, which has the least rotational friction, resulting in high-speed downhill skiing, but if you change course and ski down diagonally,
Since the ski rests on the medium sphere 4a or the small sphere 5, which have a lot of friction when rotating, the speed is suppressed, and the course can be easily changed in the same way as on the snow surface. Also, the speed is moderately suppressed even when going downhill.

As is well known, the structure of snow crystals has a pyramid structure, but the arrangement of the spheres 4, 4a and the small spheres 5 as described above forms a connected pyramid structure, which makes it difficult to slide down on the snow. You can get the same feeling.

Figures 4 to 6 show the pyramid structure extracted from the arrangement in Figure 2, and as shown in Figure 4, the middle sphere 4a
It has a regular pyramid structure because the small balls 5 are arranged around it. Further, as shown in FIG. 5, the tall large spheres 4 are arranged around the medium sphere 4a, so it has an inverted pyramid structure, and together with the arrangement of the low small spheres 5, it becomes an octahedron. ing. Furthermore, as shown in FIG. 6, since six large spheres 4 are arranged around the medium sphere 4a, a hexagonal inverted pyramid structure also exists.

For the spheres 4, 4a and the small spheres 5, composite vulcanized rubber mixed with antistatic carbon black can be effectively used.

[Other Examples]

FIG. 7 shows another embodiment, in which a large sphere 4, a medium sphere 4a, and a small sphere 5 are arranged diagonally at a 45@ corner in the downhill sea +-S, as in the previous embodiment. There is.

Incidentally, the downhill seat S is composed of a downhill board 2 and a back plate 20, unlike the previous embodiment.

The sliding board 2 does not require a push plate to hold the spheres 4, 4a, and a ridge 18 is integrally formed at the opening of the recesses 6, 6a to prevent the spheres 4, 4a from escaping. Recesses 6, 6
Between the top, bottom, left and right of a, there are holes 12 for holding down the small balls 5.
is formed.

The back plate 20 has a shape to be bonded to the back surface of the sliding board 2, and has a recess 7 into which the small balls 5 are fitted at a location corresponding to the hole l2. Regarding the connection between the sliding board 2 and the back plate 20, the sliding board 2
On the back side, there are recesses 22a, 22 whose upper ends, that is, the inner parts are enlarged.
b, the protrusions 23a, 23b of the back plate 20 are tightly fitted into the recesses 22a, 22b and coupled, and by this coupling, the sliding board 2 and the back plates 20, 21 are integrated, and as a result, The small ball 5 is held down.

〔Effect of the invention〕

As explained above, according to the present invention, countless large spheres and medium spheres supporting skis are arranged alternately or in an appropriate arrangement on the downhill seat placed on the downhill slope, and the spheres are arranged alternately or in an appropriate arrangement. Since the small balls are arranged between the top, bottom, left and right of the ski, when you put your skis on the downhill seat, you can slide down on it as the balls rotate, and the friction between them is rolling friction. The generation of frictional heat is extremely low, and unlike with artificial turf, there is no risk of damaging the downhill surface or skis due to frictional heat, and the acceleration distance of the skis is extremely short, allowing you to gain speed from the beginning. Even if the speed increases, there is no extreme braking, and the unevenness caused by the ball causes moderate changes, so you can enjoy downhill skiing just as much as you would on a snowy slope.

In addition, the structure is such that the medium and small spheres provide some resistance to the downhill movement of the skis on the large sphere, so the speed of the skis is moderately suppressed. Because the structure is arranged in a flexible manner, it has the excellent effect of creating an artificial slope that provides the same feeling as sliding down on snow.

[Brief explanation of the drawing]

Figures 1 to 6 show one embodiment, Figure 1 is a perspective view, Figure 2 is a partially cutaway plan view of the downhill seat, and Figure 3 is an enlarged view of Figure 2 taken along the line A-A. The cross-sectional views and FIGS. 4 to 6 are explanatory diagrams of the arrangement structure of spheres and small spheres, respectively. FIG. 7 is a sectional view corresponding to FIG. 3 showing another embodiment. S...Downhill seat 1...Downhill slope 4...Large sphere r 4a...Medium sphere 5...Small sphere 6, 6
a, 7... recess

Claims (1)

[Claims] 1) On a downhill sheet placed on a downhill slope, numerous large and medium spheres that support skis are arranged alternately or in an appropriate arrangement, and small spheres are placed between the upper, lower, left and right sides of the spheres. A recess is formed in the downhill sheet to hold the spheres and small spheres so that they can rotate freely, and the medium spheres and small spheres provide some resistance to the skiing downhill on the large sphere. An artificial ski slope characterized by being configured to give.