JPH07328158A - Throwing tool - Google Patents

Abstract

PURPOSE:To provide a throwing tool which is usable for practicing tools of the javelin or playing tools. CONSTITUTION:A throwing tool is composed of a bar body 1 of which front end 3 is formed to be a rotated body of a conic section, a plurality of spiral grooves 5 arranged along a spiral on the outer periphery of the bar body 1, a plurality of recesses 7, 9 continuously arranged in the spiral groove 5 on the extended line of the track of the spiral groove 5 and screw blades 11 provided along the extended line of the track of the spiral groove 5 at the rear end part of the body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throwing tool which enables throwing similar to spear throwing and can be used for practicing spear throwing or for playing regardless of age or sex.

[0002]

2. Description of the Related Art Spear throwing is a type of field competition in which a spear is thrown from a prescribed railroad crossing after running and competing for the length of the reaching distance. Since spear throwing is aimed at long objects in throwing competitions, special skills such as gripping the spear and holding it during the run are required.

A competition spear used for spear throwing has a blade portion which is pierced into the field at the tip portion, and in the case of a boy,
Length 2m600mm to 2m700mm, weight 800g
Above, in the case of girls, the length is 2m200mm to 2m30
It is specified to be 0 mm and weighs 600 g or more, which is long and heavy. Conventionally, what is commercially available as a training tool is an inexpensive or non-standard spear for competition, and thus has a length and weight almost similar to those of the competition spear.

[0004]

As described above, spear throwing uses special equipment that is long and heavy, and requires special skills such as grasping the spear and holding it during the run. Therefore, for example, for children up to the age of fifteen. I couldn't throw it, and I couldn't get interested in spear throwing.

Further, depending on the skill development stage, sufficient practice is required to solidify the foam. For this,
It is necessary to make or correct foam such as gripping the spear and holding it during the run. However, since the conventional practice equipment is long and heavy, it is difficult for beginners to easily practice and it is difficult to practice. Moreover, the conventional practice tools are long and heavy, which makes them inconvenient to carry.

It is an object of the present invention to solve the above-mentioned drawbacks and to provide a throwing tool which enables throwing similar to spear throwing, which makes the spear throwing interesting and can also be used for practicing spear throwing.

Another object of the present invention is to provide a throwing tool which can be used for playing regardless of age or sex because of its convenience and safety.

[0008]

To achieve the above object, according to the present invention, a rod-shaped main body having a tip end portion formed in the shape of a conical curving body, and a plurality of rod-shaped main body provided along the outer periphery of the main body. Spiral groove, a plurality of recesses arranged continuously with the spiral groove on the extension line of the spiral groove, and a screw-shaped blade portion provided at the rear end of the main body along the extension line of the spiral groove. To provide a throwing tool characterized by consisting of. At that time, it is conceivable to form the spiral groove from the substantially rear end of the tip portion to the substantially central portion of the main body. Further, it is conceivable that the length of the blade portion is about 1/4 of the length of the main body, and the outer diameter thereof is about 1.5 times the outer diameter of the main body. Further, the recesses are arranged on the extension line of the spiral groove continuously with the spiral grooves, and between the spiral grooves, a plurality of recesses are arranged in parallel with the disposition group (first disposition group) of the recesses. It is conceivable to dispose the concave portion (second arrangement group). Further, it is conceivable that the same number of recesses in the first arrangement group and the same number of recesses in the second arrangement group are provided. Further, it is conceivable that the main body and each part are made of a lightweight material. Also,
From a rod-shaped main body whose tip portion is formed in the shape of a conical curving body, a grip portion provided in a spiral shape on the outer periphery of the rear portion of the main body, and a screw-shaped blade portion provided at the rear end portion of the main body. It is possible that

[0009]

When the throwing tool according to the present invention is thrown, the air is first divided into an upper flow and a lower flow due to the shape of the tip. The spiral groove then straightens the flow of air along the spiral. A part of the rectified air enters a group of recesses that follow the extension of the spiral groove to form a vortex. The air vortex acts as a film of air on the air flowing along the longitudinal direction of the main body, so to speak, to reduce air resistance and to generate buoyancy. This is called the dimple effect. When the air resistance becomes small due to the dimple effect, the main body is further propelled by the blade portions, and thus the main body flies further away.

The group of recesses has a dimple effect during flight as described above, but since a large number of them are arranged for throwing, the size of each person's hand, or a beginner's grip, a Finnish grip, a fork grip. It is possible to appropriately respond to various grip positions depending on various grip methods.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a throwing tool according to the present invention will be described in detail based on illustrated embodiments.

Reference numeral 1 is a rod-shaped main body. The tip portion 3 of the main body 1 is formed in a paraboloidal rotating body shape.

On the outer periphery of the main body 1, three spiral grooves 5 are provided along the spiral from a substantially rear end of the tip portion 3 to a substantially central portion of the main body 1 (FIG. 3).

On the extension line of the spiral groove 5, a concave portion 7 of a first arrangement group is provided, which is composed of a plurality of concave portions arranged continuously to the spiral groove 5. Between the spiral groove 5 and the spiral groove 5, the first
A concave portion 9 of the second arrangement group is provided in parallel with the concave portion 7 of the arrangement group. Therefore, as shown in FIG. 4, a total of 6 groups of the concave portions are arranged. The recesses 7 of the first arrangement group and the recesses 9 of the second arrangement group are the same in number, that is, one arrangement group has 7
It consists of individual pieces. Further, the size and shape of each of the recesses 7 of the first arrangement group and the recesses 9 of the second arrangement group are the same as shown in FIG. The depth and outer diameter of the concave portion 7 of the first arrangement group and the concave portion 9 of the second arrangement group are the same as those of the spiral groove 5 as shown in FIGS. 3 and 4.

At the rear end of the main body 1, three screw-shaped blades 11 are provided along the extension of the spiral groove 5. The ratio of the blade portion 11 to the main body 1 is the length b
Is about 1/4 of the length a of the body 1 and the outer diameter d is the body 1
The outer diameter c is about 1.5 times. A desired propulsive force can be obtained by setting the blade portion 11 to this extent.

In the illustrated embodiment, the main body 1 has a total length a of about 670 mm and an outer diameter c of about 45 mm, and is made of a lightweight material such as foaming urethane. The angle θ of the spiral groove 5 is about 20.
°. The length b of the blade 11 is about 190 mm and the outer diameter d.
Is about 70 mm. The weight is about 260 g.

The operation and effect will be described based on the above configuration. When the throwing tool is thrown, first, since the tip portion 3 is formed in the shape of a paraboloidal rotating body, the air is divided into an upper flow and a lower flow as shown in FIG. Next, the spiral groove 5 rectifies the flow of air along the spiral. A part of the rectified air enters a group of concave portions 7 and 9 continuing on the extension line of the trajectory of the spiral groove 5 to form a vortex. The air vortex acts as a film of air to the air flowing along the longitudinal direction of the main body 1, so to speak, to reduce the air resistance and to generate buoyancy (dimple effect). This dimple effect reduces air resistance and adds buoyancy,
Further, the main body 1 is propelled by the blade portions 11, so that the main body 1 flies farther.

In throwing, since a large number of recesses 7 and 9 are arranged in a group, various grips can be obtained depending on the size of each person's hand or various grips such as a beginner's grip, a Finnish grip and a fork grip. It is possible to respond appropriately to the position.

As described above, according to this embodiment, desired diversion, rectification, dimple effect, etc. can be obtained.
As a result, a reach distance that cannot be obtained from a simple rod-shaped object can be obtained, so that throwing similar to spear throwing is possible and children up to about 15 years old can be interested in spear throwing.
In this case, there is an advantage that a sports disorder is unlikely to occur in the elbows, shoulders, etc. even if the foam is improper.

Further, it can be used as a practicing tool for spear throwing, and it is effective for practicing holding and holding while running, and easy throwing practice in an open area.

Further, since it has no blade on the tip and is relatively short and lightweight, it can be used for amusement regardless of age or sex.

The throwing tool according to the present invention is not limited to the above embodiment. For example, the shape of the tip may be a hyperboloid or other conical curving shape.

The number of spiral grooves, the number of recesses and the number of blades in each group are arbitrary. The drilling position and length of the spiral groove are also optional as long as they are not affected by the rectifying action. The positions and lengths of the recesses formed in each group are arbitrary as long as they are not affected by the dimple effect. The protruding position, length, and shape of the blades are also optional as long as they are not affected by the propulsion force.

Further, the concave portion may not be provided with the second arrangement group.

Furthermore, the number of recesses in the first arrangement group and the second arrangement group need not be the same.

Furthermore, in the illustrated example, the concave portions of the first arrangement group and the concave portions of the second arrangement group are arranged in a grid pattern, but they may be arranged alternately.

Next, it is conceivable that the spiral groove or the concave portion is not provided, and instead, a spiral grip portion is provided on the outer periphery of the rear portion of the main body.

[0028]

As described above, according to the throwing tool of the present invention, it is possible to obtain a reaching distance which cannot be obtained from a mere rod-like body due to the dimple effect or the like, and therefore, there is an effect that makes the spear throw interesting. . It can also be used as a training tool for spear throwing, and is effective for holding and holding while running, and for easy throwing practice in open areas.

Furthermore, since it has no blade on the tip and is relatively short and lightweight, it can be used for amusement regardless of age or sex.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a throwing tool according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is an end view taken along the line AA of FIG.

4 is an end view taken along line BB of FIG.

5 is a right side view of FIG. 1. FIG.

6 is a left side view of FIG. 1. FIG.

[Explanation of sign]

 DESCRIPTION OF SYMBOLS 1 Main body 3 Tip part 5 Spiral groove 7 Recessed part of 1st arrangement group 9 Recessed part of 2nd arrangement group 11 Blade part

Claims (7)

[Claims] 1. A rod-shaped main body whose tip portion is formed in the shape of a rotating body having a conical curve, a plurality of spiral grooves provided along the spiral on the outer periphery of the main body, and a spiral groove on an extension line of the spiral groove. A throwing tool comprising: a plurality of concave portions continuously provided in the main body, and a screw-shaped blade portion provided at a rear end portion of the main body along an extension line of the spiral groove. 2. The throwing tool according to claim 1, wherein the spiral groove is formed from a substantially rear end of the tip portion to a substantially central portion of the main body. 3. The throwing tool according to claim 1, wherein
The throwing tool is characterized in that the blade portion has a length of about 1/4 of the length of the main body and an outer diameter of about 1.5 times the outer diameter of the main body. 4. The throwing tool according to claim 1, wherein the recess is provided continuously with the spiral groove on an extension line of the spiral groove, and the recess is provided between the spiral grooves. A throwing tool, wherein a plurality of recesses are arranged in parallel with a group of recesses (first group of arrangements) (second group of arrangements). 5. The throwing tool according to any one of claims 1 to 4, wherein the recesses of the first arrangement group and the recesses of the second arrangement group are the same in number. 6. The throwing tool according to claim 1, wherein the main body and each part are made of a lightweight material. 7. A rod-shaped main body whose tip portion is formed in the shape of a rotating body having a conical curve, a grip portion provided in a spiral shape on the outer periphery of the rear portion of the main body, and a screw shape provided at the rear end portion of the main body. A throwing tool comprising a blade part of