JPH0255056B2 - - Google Patents

Abstract

1. Spring board for gymnastics, wherein a curved top board (6) having a jumping-off area and a curved supporting board (1) form an acute angle and are separated at a distance from the angle apex by means of an S-shaped spring leaf (2), the top board (6) and the supporting board (1), the top board (6) and the spring leaf (2), as well as the spring leaf (2) and the supporting board (1) forming an abutment area in each case where they rest against one another, and a resiliently compressible, interposed spring element (4) is associated with at least one of the abutment areas, characterised in that the spring element (4) is interposed in at least one of the abutment areas, shears, and comprises a resilient property, which is softer than that of the spring board without the spring element.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gymnastics take-off board, and more particularly, a headboard and a floorboard are joined at one end of each at an acute angle, and a spring plate is interposed between the headboard and the floorboard. One end of this spring plate is connected to the longitudinal center of the bottom plate, while the other end is connected to the other end of the headboard via an elastic member, thereby reducing the impact load applied to the headboard. The present invention relates to a gymnastics take-off board that can effectively absorb energy by an elastic member.

Regarding conventional gymnastics take-off boards, for example, West German Patent Publication No. 1032140, West German Patent Publication No.
As disclosed in No. 2725401 and Japanese Unexamined Patent Publication No. 1983-56734, the head plate, bed plate, and spring plate are fixed in contact with each other at each joint, and relative displacement at each joint is permissible. It has not been. Due to its spring characteristics, this railroad crossing board is
It can only be set for a relatively narrow jumping load range. Therefore, if a light person uses a stepping board set for a heavy person, the results will not be good, and vice versa.

Therefore, one of the objects of the present invention is to create a new type of takeoff board that exhibits spring characteristics that are as uniform as possible even when the jump load range is expanded. The level crossing board according to the present invention solves this problem and is characterized by the following. That is, a spring element (elastic member) that can be elastically contracted and restored is interposed in at least one joint between the head plate, the floor plate, and the spring plate, and this spring characteristic makes the spring element It should be more flexible than a level crossing board that does not hold.

When loaded, a spring element inserted between the headboard and the tread, the headboard and the spring plate, or the spring plate and the tread absorbs a downward or pressing force. This spring element is more effective when flying by a lighter person.

Since the spring elements absorb the pushing forces, the amount of deflection of the headboard and/or the floorboard can be increased without damage occurring at the joints as a result of the pushing movements. The fact that it is now possible to amplify the deflection or curvature of the board not only increases the amplitude of the board, but also contributes to extending the range of loads for which the board can be used.

In addition, when a spring element (elastic member) is interposed between the headboard and the spring plate, it is possible to arrange the spring element over the entire width of the railroad crossing board, so the effect of the spring element is most noticeable. becomes. On the other hand, when a spring element is interposed between the headboard and the tread plate, or between the spring plate and the tread plate, the tread plate is usually made from two crosspieces arranged parallel to each other and spaced apart from each other. Because of this structure, it is not possible to arrange the spring element over the entire width of the board, which results in a reduction in the effectiveness of the spring element.

The spring element can also be made of a series of steel coils, for example. However, it is difficult to assemble and makes a loud noise when in use.
Therefore, it is desirable to use a block element made of a material that can be elastically contracted and restored as the spring element. This spring block element is easy to assemble and does not make noise during use.
The spring block element is made, for example, of rubber or of a suitable plastic, for example polyurethane.

The spring element may, for example, be a plastic square extending over the entire width of the crossing board. However, it is more preferable that the spring element comprises a plurality of mutually independent elastic bodies arranged over the entire width of the takeoff board. Their independent and spaced apart elastic bodies improve the spring properties of the spring element and of the stepping board.

The spring element may be solid, for example. However, it is more effective to make the spring block element hollow. for example,
The desirable spring properties are particularly well achieved with relatively thick-walled, cylindrical block elements.

In the take-off board according to the invention, the spring properties are generally softer than in conventional take-off boards. The spring characteristic here refers to the ratio of load to spring amplitude. Under a certain maximum load, the amplitude of the spring of the level crossing plate according to West German Patent Publication No. 2745401 is 80 mm
However, the level crossing board according to the embodiment of the invention described below exhibits a spring amplitude of 120 mm at the same maximum load. This is about a 50% larger total amplitude, but it occurs when the total height of the takeoff board is correspondingly larger.

The amplitude of the spring element is 35% of the total amplitude of the crossing board.
However, if we take into account the increased amount of curvature of the headboard made possible by the inclusion of the spring element as mentioned above, the amplitude of the spring element is 20 to 40% of the total amplitude of the take-off board. %. As a result, when the same load is applied, this level crossing board sinks (amplitude) approximately 40% more on average than the level crossing board disclosed in West German Patent Publication No. 2725401. Become.

If desired, the spring element can also be left unfixed, but only interposed. In order to prevent the spring element from changing its position unexpectedly, the spring element is pasted or attached to the plates between which it is sandwiched.

In either case, it is desirable to provide a flexible frame for holding the joint in a state that allows the spring element to contract and restore its shape at the joint in which the spring element is interposed.

1 and 2, suitable embodiments of the invention are shown.

The level crossing board shown in Figures 1 and 2 has a long and narrow bottom board 1, which rests on a platform and is made up of two crossbars running parallel and apart from each other. There is. The floor plate 1 is curved upward between its ends. Or it's crooked.
It is flexible throughout its length, resting only on the ends. A single spring plate 2 is fixed on the floor plate 1, and the shape of this spring plate is a shallow S-shape. The lower end portion rests on the bottom plate 1 and is screwed to the bottom plate 1. The spring plate 2 is solid over its entire width, elastic and pliable over its entire length, and is located in the front half of the floor plate 1.

The spring plate 2 carries a series of elastic bodies 3 at its upper front end. This series of elastic bodies together forms one spring element 4. Each elastic body 3 is cylindrical with a cavity 5, but is otherwise solid or in the form of a block and made of plastic, for example polyurethane. The elastic body 3 is aligned with the vertical central axis of the cavity 5 and is thereby attached with one front face to the upper end portion of the spring plate. The elastic bodies 3 are separated from each other. A piece of foam rubber tape 9 is attached to the lower end of the spring plate 2, which functions as a buffer member and softens the shock against which the headboard hits.

A front end portion of an elongated head plate 6 is attached to the upper front surface of the elastic body 3. The headboard 6 is
It is solid over its entire width, elastic and pliable over its entire length, and curved or curved between its ends. The rear end of the headboard 6 rests on the rear end of the bed plate 1 and is fixed thereto with screws. At the corner between the headboard 6 and the floorboard 1, a spacing block 7 made of several layers is attached. A strip-shaped elastic and flexible reinforcing agent 8 is attached to the rear of the underside of the headboard.

The head plate 6 and the spring plate 2 are held together by a frame 10 having a U-shaped cross section. Waku 10
is formed as a hood, pushed over from the front and pasted on. This hood-shaped frame 1
0 is made of textiles or plastics with a similar effect. The frame is made of a tensile material such as PVC and reinforced with glass fibers. The frame 10 does not allow the head plate 6 and the spring plate 2 to be separated at their joint by more than a distance determined by the height of the spring element 4 in the unloaded state.

FIG. 3 shows the results when the same vertical load is applied to the takeoff board in which the takeoff board based on the above embodiment and the head board, floor board, and spring board of the conventional technology are fixed in contact with each other at each joint. It shows the amount of vertical deflection of the headboard over time.

As is clear from FIG. 3, the maximum deflection amount of the headboard in the above conventional technology is 7.1 cm, whereas the maximum deflection amount of the headboard in this embodiment is 10.0 cm.
cm. This means that in the above-mentioned prior art railroad crossing board, the front end of the headboard and the front end of the spring plate are in contact with each other and fixed, and the space between the front end of the headboard and the front end of the spring plate is This is due to the fact that the spacing member interposed therein acts to limit the amount of deflection of the headboard against the impact load at the initial stage of the jump.
As a result, the impact applied to the jumper's legs at the beginning of the jump is amplified, and the impact load applied to the headboard is similarly increased. On the other hand, in the level crossing board based on this example, as described above,
The front end of the head plate 6 and the front end of the spring plate 2 are connected via the spring element 4 (elastic member). The front end is relatively movable. As a result, in the take-off board based on this embodiment, the amount of deflection of the headboard 6 at the initial stage of the jump is greater than the amount of deflection of the headboard in the prior art. Therefore, the impact load applied to the jumper's legs is reduced, and at the same time, the impact load applied to the headboard is also absorbed by the spring element 4. As a result, the burden placed on the jumper's legs is reduced, making it possible to effectively prevent injuries to the knees and the like that are likely to occur during jumping. Furthermore, in the takeoff board of this embodiment, as mentioned above, by alleviating the impact at the initial stage of the jump using the spring element 4, it is possible to reduce wear and tear on the headboard and dramatically extend its service life. It is what it is. Furthermore, the spring element 4 makes it possible to store the kinetic energy at the initial stage of the jump as elastic force, thus making it possible to impart sufficient jumping energy to the jumper.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a gymnastics take-off board according to an embodiment of the present invention. 2 is a partially cross-sectional schematic plan view showing the arrangement of the main components of the railroad crossing board shown in FIG. 1. FIG. FIG. 3 is a graph showing the amount of deflection of the headboard in the vertical direction when a vertical load is applied to the takeoff board, comparing the embodiment of the present invention with the prior art. 1...Bed plate, 2...Spring plate, 3...Elastic body,
4... Spring element, 5... Cavity, 6... Head plate, 7... Spacing block, 8... Reinforcement material, 9
...Foam rubber tape, 10...Hood-shaped frame.

Claims (1)

[Scope of Claims] 1. A bed plate curved upward toward a substantially central portion in the longitudinal direction, joined to the bed plate at one end at an acute angle, and the other end facing the other end of the bed plate. and a headboard interposed between the bedboard and the headboard, one end of which is joined to the longitudinal center of the bedboard and the other end of which is connected to the other end of the headboard via an elastic member. a spring plate that is connected to the other end of the head plate and always biases the other end of the head plate in a direction away from the other end of the floor plate through the elastic member; The elastic member disposed at the joint between the other ends of the head plate is composed of a plurality of cylindrical elastic bodies, and the elastic bodies are spaced apart from each other in the lateral direction and attached to the other end of the head plate. A railroad crossing board for gymnastics, characterized in that the board is arranged in rows along the track. 2. A bed board that is curved upward toward approximately the center in the longitudinal direction, and a head board that is joined to the bed board at one end at an acute angle and whose other end is arranged opposite to the other end of the bed board. interposed between the bed board and the head board, one end is joined to the longitudinal center portion of the bed board, the other end is joined to the other end of the head board via an elastic member, a spring plate that constantly urges the other end in a direction away from the other end of the bed plate through the elastic member; and a spring plate at a joint between the one end of the spring plate and the bed plate. a buffer member provided on a surface facing the head plate, and the elastic member is composed of a plurality of cylindrical elastic bodies, and the elastic bodies are spaced apart from each other in the lateral direction to prevent the head plate from colliding with the head plate. arranged in a row along the other end to reduce the impact between the head plate and the spring plate;
A take-off board for gymnastics, characterized in that the buffer member cushions a shock caused by a collision between the headboard and the one end of the spring board.