JP2005095536A - Hurdle for track and field game - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide hurdles for track and field games which easily fall down by a force within a rule corresponding to each game, and which easily rise after contacting with the ground. <P>SOLUTION: A foot switch mechanism is applied for smoothing vertical motion of a bar of the hurdle for track and field games, and a means to eliminate wire in a mechanism from the foot switch to a fitting pin is provided. An inclination of 45 degrees is imparted to a base part so that a fulcrum position of falling down of the base is constant, and a polygon shape is imparted so as to prevent concentration of stress in an inclination corner of 45 degrees at the time of contacting with the ground. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Regarding track and field hurdles, the present invention relates to track and field hurdles that can easily fall down with the force within the rules according to each event, and that easily rise after ground contact.
It also relates to a hurdle that can guarantee the minimum bar height within the rules by rational setting of the fulcrum.

As an example of an invention aiming at the ease of overturning of a hurdle for athletics, there was an invention relating the adjustment of the bar height of the hurdle to the interlocking of the overturning fulcrum position satisfying the standard. (For example, refer to Patent Document 1.)
Japanese Utility Model Publication No. 06-075600 (Explanation of Fig. 3 on page 3 and Fig. 5 on page 7) As shown in the above-mentioned patent document, the relationship between the bar height of the hurdle and the fulcrum fulcrum position is sought so that the hurdle can easily fall down, but the fulcrum position is moving at each height, The effect was not constant.
In FIG. 5 of the cited patent document, the position of the pin 14 is at point A, and the overturning fulcrum 15 of the fulcrum piston 11 comes into contact with the ground in a surface contact state only when it falls over at the point A ′. It ’s easy to get up because of the high repulsion from the ground.
In this case, the bar trajectory also gradually decreases from the maximum height.

In the remaining cases, since the contact state with the ground is close to point contact, the ground is easily damaged and the rising effect is weakened.
Also, when looking at the trajectory of a bar fall, the trajectory of the fall was always drawn after being lifted to the highest height.
This is a phenomenon that inevitably arises from the structure in which the weight 13 is fixed inside. In the present invention, it is necessary to improve the structure itself.

In relation to the relationship between the bar height and the falling fulcrum position in the track and field hurdles, a method is required in which the fulcrum position does not change at any height.
Furthermore, the present invention seeks a method that can guarantee the minimum height as compared with other methods in which the bar height does not jump up by a reasonably determined fulcrum.

In the above-mentioned [Patent Document 1] Japanese Utility Model Application Laid-Open No. 06-075600, “In this way, the height can be adjusted to the required level for each sporting event, and each height is at least 3 kg 600 to 4 kg. When force is applied to the center of the top bar, it is obliged to attach a weight so that the balance can be adjusted to fall.
Therefore, various ideas have been made to satisfy such standard conditions without impairing operability.
As typical examples, Japanese Utility Model Publication No. 52-76755 and Japanese Utility Model Application No. 3-63399 are known.
As typical examples, Japanese Utility Model Publication No. 52-76755 and Japanese Utility Model Application No. 3-63399 are known. "Is accepted.
Furthermore, in order to satisfy the above-mentioned standard, the conventional product uses a weight that is housed in the base leg and a wire that is complicatedly stretched in the leg and moves forward in the leg as the bar moves upward. "
This time, we adopted a foot switch mechanism that can be controlled by the legs to make the vertical movement of the bar smooth, and took measures to eliminate the wires from the mechanism from the foot switch to the fitting pin.
Then, a 45 degree inclination is applied to the base so that the position of the fulcrum of the base is constant irrespective of the height adjustment of the bar.
In some cases, the corner portion on one side is formed into a polygonal shape for the purpose of reducing stress concentration when the 45-degree inclined shape falls.
Even in this case, the characteristic of the fulcrum does not change at all, and the phenomenon that the bar height temporarily rises by reducing the height smoothly from the maximum height does not occur.

Since the present invention is configured as described above, the bar up-and-down mechanism is built in the pipe in advance, and since no wire is used for this mechanism, there is no sense of the wire extending, The degree was much better than before.
Next, the position of the tumbling fulcrum of the bar, the position of the fulcrum at the base at the time of the tumbling is constant regardless of the height adjustment of the bar.
The same applies to the case where the stress concentration mitigating polygonal shape is applied to the 45 ° inclined portion, and is an athletics hurdle in which the end surface opposite to the polygonal processing side is the fulcrum position.
In addition, since the contact state with the ground surface after the fall becomes surface contact unlike before, the repulsive force received from the ground is increased and the rising force is greatly increased as compared with the conventional method.
In any case, the bar height is smoothly reduced from the maximum height according to the trajectory, so that it is possible to prevent a disadvantageous movement that once raises the height like the hurdle of the conventional mechanism.
On the other hand, in the conventional shape having no 45 degree inclination, the direction of the force transmitted due to the shift between the fulcrum position and the position where the force is transmitted from the player is different.
In other words, if chamfering is not applied to the base, the direction of the force is not horizontal according to the fulcrum, but the bar height is lifted once, and then the grounding after falling is reduced while decreasing the height. The restoring force received due to the contact is weakened, and the ground surface is easily damaged by the edge point contact.

In the present invention, a foot switch mechanism capable of adjusting the height of the bar with the legs is made in advance, and attached to the shaft receiver of the inner pipe and the leg pipe in the height direction, and only the important mechanism part is a hurdle without wires. To do.
At that time, a 45 degree inclination to the base part, or a polygon for preventing stress concentration at the corner part is given, and the height is continuously increased from the same fulcrum position which is one inclined end face regardless of the height of the bar. Tumbled while reducing.
Unlike the conventional hurdles, the bar that receives the power will efficiently transmit the force within the prescribed range from the competitor.
That is, the disadvantageous phenomenon that the bar height rises temporarily is sealed, and the hurdle base 45 degree inclined portion after the fall and the ground surface are in a surface contact state, so that the contact repulsive force is sufficiently received. It becomes extremely easy to get up.

を加えた多角形形状８にした事例である。
２つの事例に於いて、支点の有する意味は全く同様である。In the case of the present invention, the foot switch shown in FIG. 1 is manufactured so that it can be attached to the shaft receiver of the inner pipe and the leg pipe in advance so that the vertical mechanism of the bar of the athletics hurdle can be controlled by the operation of the leg. Put.
1 is a footswitch, 2 and 3 are bars.
FIG. 2 is a side view after attaching it, and it is important that the base has an inclination of 45 degrees at this time.
Now, FIGS. 3 and 4 show mechanical explanatory diagrams at the time of falling when the hurdle of FIG. 2 is actually used.
In FIG. 3 of the present invention, since the fulcrum position 4 and the position 42 at which the player kicks the hurdle are on the same line, the hurdle falls over very efficiently.
That is, in response to the kicking force 5 from the player, the direction 6 of the force acts horizontally at the position 42, and the bar draws a path of 7 and falls down and touches smoothly.
On the other hand, in the conventional hurdle in FIG. 4, since the kicked position 43 is not collinear with the fulcrum position 41, the direction 61 of the transmitted force is not horizontal and the bar track 71 is the track 7 of the present invention. It will be different and will be disadvantageous to temporarily increase the height, and even if it kicks with the same force level 5, it will be difficult to fall.
FIG. 5 schematically shows the difference between the trajectories. However, in the conventional hurdle, the highest point P2 is generated, which is disadvantageous.
Moreover, when the ground grounding situation at the time of falling is shown simply, the hurdle of the present invention is represented as shown in FIG.
In the case of the present invention, since the inclination of 45 degrees is given to the base portion, after being overturned by the rotational force 11 of FIG. 6, the ground and the surface are in contact with each other as shown in 10 of FIG. It will be easy to get up.
On the other hand, in the case of the conventional hurdle, the bar falls over upon receiving the rotational force 12 as shown in FIG. 7, but the contact state with the ground becomes point contact as shown in 13 or 14 of the same figure. The repulsive force from the ground is greatly reduced, making it difficult to get up.
Further, the ground is easily damaged by the point contact state.
In FIG. 8, the size of the angle 9 at the chamfered corner portion A is 45 degrees, and stress concentration may occur at the point A during the falling contact.

This is an example in which a polygonal shape 8 is added.
In the two cases, the meaning of the fulcrum is exactly the same.

    It is a perspective view before attachment of the foot switch for hurdles of the present invention.     It is a foot switch attachment side view including the chamfering state of the base part 45 degree | times for this invention hurdle.     It is a relationship figure of action stress of this invention hurdle, a fulcrum, and bar fall.     It is a related figure of the acting stress for a conventional hurdle, a fulcrum, and bar fall.     It is a schematic diagram of a bar track.     It is a side view of the grounding situation at the time of fall of the hurdle of the present invention.     It is a side view of the grounding situation at the time of conventional invention hurdle falling.     An example of the polygonal shape of 45 degree chamfering corner part stress concentration relaxation of this invention hurdle overturn is shown in relation to the whole figure.

Explanation of symbols

Ｐ 従来ハードルのバー最高高さ
８ Ａ点の応力集中緩和の為の多角形形状
９ 傾斜端面の角度（４５度）
１０本発明ハードルの円滑な接地状況
１１バー回転力

1 foot switch 2 bar 3 bar 4 fulcrum of the hurdle of the present invention 5 force kicked by the player 6 direction of force transmitted by the present invention 7 trajectory of the bar where the hurdle of the present invention falls 41 fulcrum of conventional hurdle 61 direction of force transmitted by the conventional hurdle 71 Trajectory of bar where conventional hurdle falls A 45 degree inclined end face corner B 45 degree inclined end face opposite corner

P Maximum bar height of conventional hurdles 8 Polygonal shape for stress concentration relaxation at point A 9 Angle of inclined end face (45 degrees)
10 Smooth grounding of hurdles of the present invention 11 bar rotational force

Claims (8)

In the athletics hurdles, the force within the rules is received from the competitors, and it easily falls to the ground from a reasonably determined fulcrum position that is not affected by the bar height, and further ensures contact with the ground. A hurdle for climbing competitions that is extremely easy to get up with a large repulsive force based on possible merits.
At the same time, the hurdle for athletics does not cause the phenomenon that the bar height temporarily rises when falling from the fulcrum position. Track and field hurdles with 45 ° chamfered base that allow for the effect of Hurdles for athletics with polygonal chamfered bases to enable the effect of and As an effect, the athletics hurdle can guarantee the lowest bar height within the rules.

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