JPH0741485Y2 - Metal bat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a metal bat used in baseball.

[Conventional technology]

When the metal bat is made of an aluminum material, the main body 1 is made of a hollow aluminum material as shown in FIG.
Similarly, the grip end 2 made of an aluminum material is often attached by welding.

The main body 1 is closed at its tip as a head 3, and a hitting portion 4 having substantially the same diameter is provided in the vicinity thereof, and a small-diameter grip portion 6 is provided via a taper portion 5.

[Problems to be solved by the device]

Such a metal bat has a higher hitting sound than a wooden bat, and in particular, as a sound of hitting a hardball, a bright sound of a wooden bat is heard, whereas an aluminum metal bat has a The sound is very loud and has a long tail.

A metal bat striker generally consists of two types of sounds, a sound generated immediately after the impact (first sound) and a sound generated for a while (second sound). It is thought to be due to the induced vibration.

In the second sound, a wave of vibration generated by hitting diffuses inside the bat, and is reflected at both ends of the head portion 3 and the grip end 2 to move in the bat, and the phases thereof coincide with each other to generate a large vibration. It makes a sound.

Note that the sound level near the batter is 90 to 91 dB for a wooden bat, but 109 to 111 dB for an aluminum metal bat, as measured by a sound level meter.

If the high-level impact sound of the aluminum metal bat is continuously heard in this manner, the athlete and the referee may have a hearing impairment. In addition, noise pollution may occur in the surrounding environment.

An object of the present invention is to eliminate the disadvantages of the conventional example, and to provide a good metal bat that can easily and inexpensively and effectively reduce the impact sound and swing the bat out. .

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a bat made of a hollow aluminum material, in which the fine powder 5
The gist is to encapsulate ~ 50g so that it can be moved.

[Action]

According to the present invention, by enclosing fine powder inside the bat, it is possible to suppress the wave of vibration generated by the impact from diffusing in the bat, and for a while with the first sound generated immediately after the impact. It is possible to prevent the phase of the second sound generated by the above from being matched.

Also, when the bat is swung, the fine powder moves from the grip end toward the head, so that the bat swings out well, and static electricity is generated in the fine powder by such movement of the fine powder, and the inner surface of the bat It adheres to a part of the and produces a more quiet effect.

Since the amount of fine powder enclosed is 5 to 50 g, the sound reducing effect is not recognized below 5 g, and the sound reducing effect is recognized above 50 g, but since it becomes heavy in weight, the weight of the entire bat is adjusted. It is suitable because there is no inconvenience that it is troublesome.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially cutaway side view showing a first embodiment of an aluminum metal bat of the present invention. The bat has a main body 1 formed of a hollow aluminum material as described in FIG. Similarly, a grip end 2 made of an aluminum material is welded to the main body 1 and the tip of the main body 1 is a head 3.
As a result, the striking part 4 having almost the same diameter is formed in the vicinity thereof,
There is a small-diameter grip portion 6 via the taper portion 5.

The main body 1 and the grip end 2 are formed from a 7000 series aluminum alloy material according to a conventional method. The main body 1 is formed by swaging a drawn pipe to form the taper portion 5 and the grip portion 6 and then the head. The parts are integrally closed by spinning and then heat-treated to give required strength. The grip end is formed by drawing a plate material.

In the present invention, the fine powder 7 is enclosed inside the main body 1. The fine powder 7 has a specific gravity of 0.01 to 0.5 and a particle size of 3 to 100 mmμ, and silica (SiO ₂ ) or glass microballoons are suitable as an example.

The particle shape may be either spherical or pulverized, or may be hollow spherical such as glass microballoon.

The enclosed amount is preferably 5 to 50 g. If it is less than 5 g, the sound reducing effect described later is not recognized, and if it exceeds 50 g, the sound reducing effect is recognized, but it becomes heavy in weight, so that the weight adjustment of the entire bat becomes troublesome.

As an example of the encapsulation method, as shown in FIG. 4, before welding the grip end 2 to the main body 1, the fine powder 7 is inserted from the opening at the end of the grip 6 of the main body 1, and then buffing or alumite is performed. A bat finished product is obtained through processing.

Further, depending on the type of bat, there is an opening in the head portion 3, and there is also a cap provided on this opening. In such a butt, the fine powder 7 may be inserted through the opening of the head portion 3 after the grip end 2 is welded to the main body portion 1.

Further, in the main body 1, as described above, the drawn tube is swaged to form the taper portion 5 and the grip portion 6, and then the head portion is integrally closed by spinning, and then heat treatment is applied to provide a required strength. However, since the fine powder 7 has heat resistance, it can be enclosed before the heat treatment.

In this way, the fine powder 7 enclosed in the main body 1 is
As shown in FIG. 2, when the bat is erected, it fills the taper portion 5 and the grip portion 6, and also freely moves in the main body portion 1 to fill the striking portion 4 when striking.

Next, Table 1 below shows experimental results for testing the effect of the metal bat of the present invention.

The time waveform of the sound is as shown in FIG.

As can be seen from Table 1 and FIG. 4, a sound reduction effect equivalent to that of a wooden bat was recognized, and the impact sound was at a level at which it was not noticeable even when continuously heard.

This is due to the synergistic effect that the impact sound itself is reduced due to the presence of the fine powder 7 and the second sound that is generated for a while from the first sound that is generated immediately after the impact is eliminated.

[Effect of device]

As described above, the metal bat of the present invention is a bat made of a hollow aluminum material, and the hitting sound becomes a bright sound “can” without any discomfort and the hitting sound itself can be reduced.

Also, when the bat is swung, the fine powder moves from the grip end toward the head part, so swinging of the bat is good, and static electricity is generated in the fine powder by such movement of the bat, and the inner surface of the bat is By adhering to a part of the above, the sound effect can be further enhanced.

In addition, when manufacturing, it is not necessary to change the current production line, and since the fine powder is not affected by heat, there is a wide range of choices between which steps of the current production line to insert the fine powder. It is easy to manufacture, and the manufacturing cost is low.

In addition, the longevity of this fine powder can be maintained for a long time, and the effect can be sustained.By adjusting the amount of the fine powder, the weight can be adjusted easily. Is what you get.

Since the amount of fine powder enclosed is 5 to 50 g, the sound reducing effect is not observed below 5 g, and the sound reducing effect is recognized above 50 g, but it becomes heavy in weight, so the weight of the entire bat is adjusted. A suitable product can be obtained without the inconvenience of being troublesome.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the metal bat of the present invention, FIG. 2 is a partially cutaway side view showing another example of the metal bat in the same use state, and FIG. 3 is an example of a manufacturing process. FIG. 4 is a waveform diagram showing a time waveform of sound, and FIG. 5 is a side view showing a conventional example. 1 ... Main body part, 2 ... Grip end 3 ... Head part, 4 ... Hitting part 5 ... Tapered part, 6 ... Grip part 7 ... Fine powder

Claims (1)

[Scope of utility model registration request] 1. A bat made of a hollow aluminum material, wherein 5 to 50 g of fine powder is movably enclosed inside the bat.