JPH0644448Y2 - 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 as a sound heard when a hardball is hit, a bat has a bright sound, whereas an aluminum metal bat has a The sound is very loud and has a long tail.

The hitting sound of a metal bat generally consists of two kinds of sounds, a sound (first sound) generated immediately after hitting and a sound (second sound) generated for a while, of which the first sound is caused by impact and It is thought to be due to the induced vibration.

In addition, the second sound is a large vibration because the wave of the vibration generated by the impact diffuses inside the bat and is reflected at both ends of the head portion 3 and the grip end 2 to be in phase while moving inside the bat. It makes a sound.

The sound level near the batter is 90-91bB for the wooden bat, but 109-111dB for the 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.

It is an object of the present invention to provide a metal bat which eliminates the inconveniences of the above-mentioned conventional example and can reduce the impact sound easily and inexpensively.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a bat made of a hollow aluminum material, in which an aluminum foil is pasted on the surface between the intermediate portion in the longitudinal direction of the bat and the head portion via an adhesive. To do.

[Action]

According to the present invention, since the aluminum foil is pasted on the surface of the bat via the adhesive, the wave of vibration generated by the impact by the action of the adhesive and the aluminum foil is prevented from diffusing in the bat. By suppressing, the impact sound itself as the first sound is reduced, and the second sound that is generated for a while from the first sound that is generated immediately after the impact is eliminated, and the small sound effect is obtained by the synergistic effect of these.

〔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. For the main body, the drawn portion is swaged to form the taper portion and the grip portion, and then the head portion is formed. They are closed together by spinning and then heat treated to give them the required strength. The grip end is formed by drawing a plate material.

In the present invention, the aluminum foil 7 is circumferentially attached to the outer surface of the striking portion 4 of the main body 1.

The aluminum foil 7 is tape-shaped, and as an example,
Foil thickness: 30-200μ, tape width: 100mm. The aluminum foil 7 is attached via an adhesive 8 such as an acrylic adhesive or a soft epoxy adhesive.
The thickness is preferably 30 to 80 μm.

After welding the grip end 2 to the main body 1 and buffing or alumite treatment to obtain a finished bat product, the adhesive 8
Is applied and aluminum foil 7 is attached, but the bat body 1
If the printing on the aluminum foil 7 has already been performed, the same printing is performed on the aluminum foil 7, and the printing on the main body 1 is performed on the foil 7.
Make sure it doesn't matter if you hide.

Further, printing may be performed after the foil 7 is attached, and in this case, the surface of the foil 7 is printed at the same time as the printing process of the bat.

The weight of the aluminum foil 7 including the adhesive 8 is 5 to 15 g.
The weight of the entire bat is very small.

FIG. 2 shows a second embodiment of the present invention, in which an aluminum foil 7 is attached to the outer surface of the tapered portion 5 of the main body 1 so as to extend in the longitudinal direction.

Further, as shown in FIG. 3 as the third embodiment, the aluminum foil 7 is also attached to the outer surface of the same tapered portion 5 in the circumferential direction as in the first embodiment.

Further, although not shown, as another embodiment, the aluminum foil 7 may be attached at any position as long as it is on the surface between the middle portion in the longitudinal direction of the bat and the head portion 3, and only the outer surface. It is also possible to stick it on the inside. When sticking on the inside like this, the grip end 2 is attached to the main body 1.
Before welding, insert it from the opening at the end of the grip 6 and stick it.

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 that was not noticeable even when continuously listening.

This is due to the synergistic effect of reducing the impact sound itself due to the presence of the aluminum foil 7 and the adhesive 8 and eliminating the second sound generated for a while from the first sound generated immediately after the impact. Is.

The aluminum foil 7 has the best sound reduction effect when it is circumferentially attached to the striking portion 4 as shown in Table 1 above, but in this case, it is easily peeled off. In the actual hit test, the tape is peeled off about 3000 times, but if peeled, it can be replaced by the user.

[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 of "can" without any discomfort and the hitting sound itself can be reduced.

In addition, when manufacturing, the current production line does not need to be particularly changed, which is extremely easy, the manufacturing cost is low, and the weight of the aluminum foil is easy to adjust because it is light even if it includes an adhesive.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a first embodiment of the metal bat of the present invention, FIG. 2 is a side view showing the same second embodiment, and FIG. 3 is a side view showing the same third embodiment. 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 ... striking part 5 ... taper part, 6 ... grip part 7 ... aluminum foil, 8 ... adhesive

Claims (2)

[Scope of utility model registration request] 1. A bat made of a hollow aluminum material, characterized in that an aluminum foil is pasted on the surface between the intermediate portion in the longitudinal direction of the bat and the head portion via an adhesive agent. 2. The metal bat according to claim 1, wherein the aluminum foil is attached to a hitting portion or a taper portion on the outer surface of the bat.