WO2009110112A1

WO2009110112A1 - Javelin

Info

Publication number: WO2009110112A1
Application number: PCT/JP2008/060984
Authority: WO
Inventors: 正登前田; 恵一佐々木; 剛史西脇; 賢志坂本
Original assignee: 株式会社ニシ・スポーツ; 株式会社アシックス
Priority date: 2008-03-07
Filing date: 2008-06-16
Publication date: 2009-09-11
Also published as: JP2009213582A; JP4534213B2

Abstract

[PROBLEMS] To concurrently facilitate a throw and lengthen a throwing distance despite using carbon fiber reinforced plastic. [MEANS FOR SOLVING PROBLEMS] A handle is constituted of a front part (5) of the handle made of duralumin and a rear part (7) of the handle made of the carbon fiber reinforced plastic, which are integrally coupled. A weight (8a) comprising a tail-like rod is extended at a terminal end (8) of the rear part (7) thereby forming a vibration control part (15). A string (11) is wound around the coupling between the front part (5) and the rear part (7) to form a grip (9). Since the materials of the front part (5) and the rear part (7) of the handle are made of duralumin and the carbon fiber reinforced plastic, respectively, vibration attenuating ability is improved. Thus, the throw can be facilitated and vibration controllability is improved. In addition, since the vibration control part (15) including the weight (8a) is provided on the rear part (7), primary natural frequency and inertial moment can be maximized, thereby making a javelin hard to oscillate and improving straight advancing ability. Thus, the throwing distance can be lengthened.

Description

For athletics

The present invention relates to a track-and-play competition used for a throw-and-throw that is a kind of track and field competition.

Concerning throwing, the throwing method, playing structure, etc. are stipulated in detail in the Japan Athletics Federation Rules (hereinafter referred to as “Rules”). The structure of spending is specified as follows.

“Spear [3] Structure-Spear is made up of three main parts: the tip, the handle, and the grip with the string wound around. The handle may be solid or hollow, and it is fixed and integrated as a whole. It must be made of metal or a similar material and have a pointed metal tip fixed to it.
The surface of the handle must be free of depressions, bumps, grooves and ridges, holes and graininess, and the surface finish should be smooth throughout (see Article 188, Paragraph 4: (Note) Similar provisions for shot throwing. ) And be uniform.
The tip must be made entirely of metal. If the tip surface is generally smooth and uniform, another tip may be welded to the tip of the tip for reinforcement.
[4] The grip should be wrapped around the center of gravity, and its diameter (Note: “D0” shown in FIG. 3) shall not exceed 8 mm from the diameter of the handle. Regardless of the type of grip, keep it on a surface that does not slip uniformly, and avoid sagging, knurled eyes, or dents.
[5] The cut surface must be completely circular everywhere. The maximum diameter of the handle must be just before gripping. The middle part of the handle, including the lower part of the handle, should be somewhat narrower towards the rear of the barrel or the diameter reduction should not exceed 0.25mm immediately before and after the grip. From the point of grip, the spear gradually decreases toward the tip and end.
The longitudinal section from the grip to the tip and end may be rounded straight or slightly convex, but the diameter should not change abruptly throughout the length of the spear.
However, the part immediately before the tip of the head and the part after the tip of the tip excluding the part immediately before and after the grip should not exceed 2.5 mm from the diameter of the handle (Note: “D0” shown in FIG. 3). The point deviating from the extension of the straight line required for the vertical section of the part should be less than 300 mm from the tip.
[6] The transaction must be in accordance with the specification (not shown).
[7] In fact, no moving parts or devices that can change the center of gravity or throwing performance during throwing should be attached.
[8] The angle of the metal tip should not exceed 40 degrees. The diameter at the point 150mm from the tip of the tip should not exceed 80% of the thickest part of the handle. At the midpoint between the center of gravity and the tip of the metal tip, the diameter should not exceed 90% of the thickest part of the handle.
[9] Narrowing toward the end should be 90% or more of the maximum diameter of the handle at the center of gravity and end point. At 150 mm from the end of the spear, it should be 40% or more of the maximum diameter of the handle. The diameter of the end of the spear handle shall be 3.5mm or more. "

やり As for the structure of spending used for throwing in this way, it cannot be used for competition unless it conforms to the detailed regulations, so the improvement of spending is limited to small partial improvements.

This is unavoidable because competing for throwing technique is the essence of throwing competition, but on the other hand, it is easy to throw on the side of the player, and there is a situation that he wants to throw away throwing distance.

Also, as a characteristic of spending, throwing distance is generally not easy for throwing, and throwing distance is often difficult for beginners to throw.

By the way, it is predicted that track and field competition will be made of carbon fiber reinforced plastic. Since the center of gravity of the spear will be formed in the front part of the rule specification, if carbon fiber reinforced plastic with a lower density than steel or duralumin is used, a large amount of carbon fiber reinforced plastic is used to balance the center of gravity of spear As a result, it tends to be harder than necessary. Also, the rear part of the handle tends to be enlarged compared to the front part of the handle.

In this way, the conventional approach made of carbon fiber reinforced plastic is hard in the material, and coupled with the tendency that the rear part of the handle is enlarged compared to the front part of the handle, it requires advanced technology for throwing and is the world's top Only class players were difficult to operate.
Japanese Utility Model Publication No. 54-160276

The present invention eliminates the above-mentioned drawbacks and provides a track and field competition that can simultaneously solve the problems that are difficult to achieve while using carbon fiber reinforced plastic, i.e., ease of throwing operation and increase in throwing distance. Objective.

In order to achieve the above-mentioned purpose, the track and field competition according to the present invention is a track and track competition consisting of a tip, a handle and a string-wrapped grip. The handle front part is made of an aluminum alloy or other metal and the handle rear part is made of carbon fiber reinforced plastic, both of which are connected together to form a handle, and from the weight to the handle rear part. A vibration control unit is provided.
Further, in the athletic competition performance according to claim 1, the vibration control unit is provided at a portion that is closer to the tip part by a predetermined length from the end of the rear part of the handle.
Further, in the athletic competition performance according to claim 1 or 2, the vibration control unit is composed of a rod body formed in a tapered shape toward the end.
In the track and field competition according to claim 1, a grip portion is formed at the joint portion of the handle.
In the track and field competition according to claim 1, the grip is provided between the fifth node and the sixth node.
Moreover, in the track and field competition according to claim 1, the pattern front part is made of duralumin.

In the track and field competition according to the present invention, the material of the handle front part and the handle rear part is composed of duralumin and carbon fiber reinforced plastic, respectively. For this reason, throwing operability becomes easy and vibration controllability becomes good. Therefore, the throwing distance can be increased.

Also, since the vibration control unit consisting of a weight is provided at the rear part of the handle, the primary natural frequency and the moment of inertia can be maximized. For this reason, it becomes difficult to shake, and straightness improves. This also increases the throwing distance.

It is a partial cross section front view of the track and field competition by this invention. (A) The cross-sectional front view of the rear part of the handle for athletics by this invention, (B) is the B section enlarged view of (A), (C) is the C section enlarged view of (A). It is a figure which shows the structural standard of the performance by a rule. It is a table | surface which shows the specification of the performance by a rule.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Doing 2 Destination 3 Tip 5 Handle front part 7 Handle rear part 7a End 8 End part 8a Weight 9 Grip 9a String 11 5th node 13 6th node 15 Vibration control part

Next, the track and field competition according to the present invention will be described in more detail based on the drawings showing the embodiments. For convenience, portions having the same function are denoted by the same reference numerals and description thereof is omitted.

The spear 1 includes a tip 3, a handle front portion 5, a handle rear portion 7, and a grip 9. The tip 3 is pushed into the handle front part 5 and joined to the handle front part 5 by an adhesive. The tip 2 of which the weight is adjusted is joined to the tip of the tip 3 by an adhesive. The handle front portion 5 and the handle rear portion 7 are substantially at the center of the handle, and the handle front portion 5 is fitted to the handle rear portion 7 and joined by an adhesive. A handle is formed by the handle front portion 5 and the handle rear portion 7. A string 11 is wound around the joint between the handle front part 5 and the handle rear part 7 to form a grip 9. The joint part of the handle front part 5 and the handle rear part 7 has substantially the same diameter, and the handle rear part 7 does not need to be enlarged compared to the handle front part 5 as in the prior art.

Since the spear 1 is composed of each of the above members, a node is formed at each part. The first and second nodes are at the rear of the tip 2 and the front of the tip 3, the third and fourth nodes are at the back of the tip 3 and the front of the handle 5, and the fifth The node 11 and the sixth node 13 are formed at the rear part of the handle front part 5 and the front part of the handle rear part 7, respectively. The grip 9 is formed between the first and third bending modes, that is, between the fifth node 11 and the sixth node 13. A steel weight, which will be described later, is provided at the tip of the tip 3 side. Further, a weight 8a made of a brass rod formed in a tapered shape toward the end is charged to the end portion 8 from the end 7a of the handle rear portion 7 to a predetermined length portion (200 mm in the illustrated example), Thereby, the vibration control unit 15 is formed. In the figure, G indicates the center of gravity.

The destination 2 is made of steel, and a weight (not shown) such as a bolt is screwed onto the arrowhead to adjust the weight. The tip 3 is made of an aluminum alloy. The said pattern front part 5 consists of duralumin. The handle rear portion 7 is made of a laminated film-like carbon fiber reinforced plastic. The carbon fiber reinforced plastic constituting the handle rear portion 7 is composed of a plurality of film layers, and each layer is laminated such that the carbon fibers of the layer intersect with the carbon fibers of the base layer at a predetermined angle.

The above-described parts, that is, the destination 2, the tip 3, the handle front 5, the handle rear 7, and the grip 9 are designed to satisfy the rule standards and specifications. The current rule standards and specifications are as shown in FIGS. In FIG. 3, D0 represents the diameter of the handle, and G represents the center of gravity.

According to the above embodiment, since the material of the handle front part 5 and the handle rear part 7 is composed of duralumin and carbon fiber reinforced plastic, respectively, the vibration damping ability is improved. This is because it is possible to control the hardness of the spear by improving the stacking arrangement of the handle rear portion 7 which is an important part for vibration control, and the weight 8a of the end portion 8 is the destination. This is because the offset function is exerted on the two weights.

Further, since the vibration control unit 15 including the weight is provided in the handle rear part 7, the primary natural frequency and the moment of inertia can be maximized. The moment of inertia can be obtained by mass × (distance from the center of gravity) ² . Since the handle rear portion 7 is separated from the center of gravity, the moment of inertia can be increased by a weight (42 g in this example) that does not feel that the handle is heavy.

For example, in the case of men, when the vibration control unit 15 is formed with a 50 g weight, the distance from the center of gravity to the vibration control unit 15 is about 155 cm in the rule.
50 × 155 × 155 ÷ 1000 = 1200 kgcm ²
The moment of inertia increases. When the moment of inertia becomes large, it becomes difficult to shake, the straightness is improved, and the throwing distance (flying distance) is increased.

Thus, by improving the vibration damping ability and maximizing the moment of inertia around the grip 9, throwing operability becomes easy and vibration controllability is improved. Therefore, the throwing distance can be increased.

Here, the relationship between natural frequency and weight will be described. In general, the natural frequency of a structure decreases as the weight of the structure increases, and also decreases as the hardness (rigidity) decreases (that is, softens). In the present invention, the primary natural frequency decreases because the weight is provided at the handle rear portion 7. However, since the vibration damping ability is high, the shake after thrown is rapidly converged, so the throwing distance can be earned. is there.

In other words, the primary natural frequency is reduced by providing a weight at the handle rear part 7, thereby making it seem that the athlete feels softer and throwing it easier. At the same time, since the moment of inertia around the grip 9 is increased, the vibration damping ability is improved, and the shake after throwing is rapidly converged, so that the throwing distance can be increased. As described above, since the natural vibration is easily settled even if the natural frequency is decreased, the ease of the throwing operation and the increase in the throwing distance can be solved at the same time.

For example, in the prototype measurement in the case where a 20 g weight is provided at the handle rear part 7, it was confirmed that the primary natural frequency decreased by “8%” from “22.95” to “21.21”. The vibration damping capacity at this time increased by “19%” from “0.765” to “0.91”.

If a damping material (not shown) is mounted directly under the grip string 9, the vibration damping ability can be improved. This is because the primary vibration produced by the throwing thrown by providing the damping material at the most displaced part of the grip 9 can be suppressed at an early stage, and the air resistance to the throwing is reduced, and further the damping material is produced. This is because the vibration damping capacity is further increased by the deformation.

For example, in a prototype measurement in which about 20 g of vinyl acetate damping material is attached to the grip 9, the vibration damping capacity is changed from “1.066” to “1.206”, which is increased by about 20%.

As described above, according to the present embodiment, it is possible to realize three elements that increase the throwing distance, such as a reduction in the primary natural frequency, an increase in the moment of inertia around the grip, and an increase in damping, thereby increasing the throwing distance. Is possible.

The track and field competition according to the present invention is not limited to the embodiment described above. For example, the joint between the handle front portion 5 and the handle rear portion 7 may be joined by a 0 ring (not shown). When the 0 ring is used, not only the gap formed at the joint between the handle front part 5 and the handle rear part 7 is filled, but also an effect as a damping material can be expected. Moreover, the method of joining the destination 2, the tip 3, the pattern front part 5, and the pattern rear part 7 is arbitrary.

The track and field competition according to the present invention can be used not only by high-level athletes for competition but also by low-level beginners for practice.

Claims

In the track and field competition consisting of a grip with a tip, a handle and a string wound, the handle consists of a handle front part on the tip side and a handle rear part as another part with the grip as a boundary, and the handle front part is an aluminum alloy. It is made of other metal and the rear part of the handle is made of carbon fiber reinforced plastic, both are connected together to form a handle, and a vibration control unit consisting of a weight is provided at the rear part of the handle. Spear.
2. The track and field performance according to claim 1, wherein the vibration control unit is provided at a portion that is closer to the tip by a predetermined length from the end of the rear portion of the handle.
3. An athletic competition performance according to claim 1 or 2, wherein the vibration control unit is formed of a rod body that is tapered toward the end.
The track and field performance according to claim 1, wherein a grip portion is formed at the joint portion of the handle.
The track and field competition according to claim 1, wherein the grip is provided between the fifth and sixth nodes.
The athletic competition performance according to claim 1, wherein the front part of the handle is made of duralumin.