JPH0737647Y2 - Metal bat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a metal bat used in baseball (whether soft or hard) or softball.

(Prior Art) Conventional metal bats are widely used in high school baseball and the like because they are lightweight and have excellent durability.

By the way, a metal bat produces a relatively large and high hitting sound (metal sound) at the time of hitting a ball, and the residents around the ground or residents near the batting center may sometimes complain about the hitting sound when hitting. .

Therefore, development of a metal bat having excellent soundproofing is strongly desired, and a metal bat having a soundproofing material arranged at the tip of the bat is known. The soundproof metal bat will be described with reference to FIGS. 6 and 7, for example, by pouring an appropriate amount of urethane liquid from the opening of the grip portion 4 toward the tip of the bat 1 as shown by arrow 14. , Foam. As a result, the soundproof material 12 made of urethane is filled and disposed in the tip portion 2 of the bat over a predetermined length inside the tip of the bat 1. After that, the grip end 5 is welded to the opening of the grip portion 4 to obtain a metal bat with a soundproof material.

It is also known that the entire inner surface of the hollow metal bat is coated with a soundproof paint (Shokai 56-28362).

(Problems to be solved by the invention) However, according to the conventional metal bat with soundproofing material, although the hitting sound at the time of hitting is small, annoying lingering sound and unpleasant metallic sound remain, and a sufficient soundproofing effect is obtained. There is a problem that cannot be obtained.

Further, since the weight of the soundproof material is the top heavy, there is a problem that the swingability is also adversely affected.

Further, for those coated with a soundproof paint, further impact sound attenuation has been required.

The inventor of the present application, as a result of diligent research on countermeasures against impact sound, generated a primary sound at the impact part, but an offensive ears and unpleasant metallic sound were generated in the taper part between the impact part and the grip part. He identified what was happening due to the vibration waves that occurred.

Therefore, it is conceivable to extend the soundproof material that has been conventionally filled in the tip portion of the metal bat to a considerable extent so as to reach the taper portion.

However, for this purpose, the amount of soundproofing material must be increased,
There is a problem that the weight of the metal bat itself increases.

(Means for Solving the Problems) Therefore, the present invention is to increase the weight of the metal bat,
(EN) A metal bat that can mitigate a lingering sound and an unpleasant metal sound when hitting, without adversely affecting swingability.

A first aspect of the present invention is a metal bat in which a soundproof material is attached in a layered manner inside a hollow of the metal bat, and the grip portion is filled with the soundproof material. Further, the soundproofing material is provided on the entire hollow inner surface, in a spiral shape or in a strip shape in the axial direction. Further, the present invention is characterized in that a soundproofing material is provided in at least the tapered portion on the grip side inside the hollow of the metal bat.

Here, the soundproofing material may be provided on at least the tapered portion on the grip side, but in addition, it may be provided on the entire grip side except the hitting portion.

Further, even in the tapered portion, it is not necessary to dispose the soundproofing material over the entire range, and the soundproofing material may be disposed in a part thereof. In short, the position, length, thickness, etc. of the soundproofing material may be determined so that the desired soundproofing effect can be obtained.

It is desirable that the soundproof material is lightweight and has a high soundproof effect. For example, an air mat made of vinyl chloride, a urethane sheet having a high density, cork, rubber or the like can be used.

This soundproof material can be applied in layers on the inner surface of a metal bat,
By filling, it is arranged inside the metal bat.

However, in terms of not increasing the weight of the metal bat,
It is desirable to attach the soundproofing material in layers and to prevent the weight from being biased toward the hitting portion.

Further, the soundproof material can be attached by changing the material or changing the attachment method (layered arrangement or filling) depending on the location.

It should be noted that in disposing the soundproofing material, it is desirable that the soundproofing material is fixed to the inner surface of the bat by using an adhesive or the like (prevention of displacement upon hitting).

Here, the soundproof material layered on the taper portion and the soundproof material filled in the grip portion may be different materials.

(Operation) That is, according to the present invention, the weight increases on the grip side or on the whole without moving the position of the center of gravity of the bat, but the overall increase in weight is slight and there is no adverse effect on the swingability. . Also, the swing balance can be adjusted extremely easily by changing the arrangement position and the length of the soundproof material.

Furthermore, by arranging the soundproofing material on the taper portion, it is possible to muffle an offensive lingering sound and an unpleasant metallic sound.

Furthermore, vibration is greatly dampened at the grip,
In addition to soundproofing, it is possible to prevent excessive impacts from being transmitted to the hand.

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIG.

The bat 1 is made of hollow metal such as duralumin, and is formed into a bat shape as a whole, and has a tip portion 2, a tapered portion 3,
It is composed of a grip portion 4 and a grip end 5.

The tip portion 2 includes a hitting portion against which a ball hits,
Large diameter and almost the same diameter. The taper portion 3 connected to the butt tip portion 2 has a taper shape in which the diameter gradually becomes smaller toward the grip side, and is located at substantially the center of the bat 1. Grip part 4 connected to taper part 3
Are formed to have a small diameter and substantially the same diameter, and a grip end 5 is provided at an end portion on the proximal side thereof.

On the inner surface of the taper portion 3, a soundproof material 10 made of cork is arranged in layers. The soundproof material 10 is fixed to the inner surface of the tapered portion 3 by heat welding or an adhesive.

The cork soundproofing material 10 may be formed by forming a tubular shape (tapered shape) along the inner surface of the bat 1 in advance and pushing it from the tip end opening of the bat 1.

The tip opening of the bat 1 is then closed, and the manufacturing of the bat is completed.

When you hit the ball with the bat 1 using the bat 1,
There was no harsh afterglow or unpleasant metallic sound, and a light impact sound was obtained.

In addition, the increase in bat weight was slight, and there was no feeling of strangeness on the swing.

The location of the soundproofing material 10 is not limited to that shown in the figure. For example, the soundproofing material should be arranged in layers with a length of 300 mm or 200 mm until reaching a position 180 mm from the end of the grip end 5. Is also possible.

On the other hand, the soundproof material 11 made of urethane is filled in the grip portion 4. Similar to the conventional example, this soundproofing material 11 is filled by injecting urethane liquid from the opening of the grip portion 4 and foaming and hardening it before providing the grip end 5, and then fixing the grip end 5 by welding. can do.

When hit with this bat 1, as in the case of the above-mentioned Example 1, the harsh afterglow and unpleasant metallic noise disappeared, and the soundproof property was excellent. Also, the impact transmitted to the hand when hit was small, and the hit feeling was excellent.

(Embodiment 2) In the embodiment of FIG. 2, the soundproof material 10 shown in the first embodiment is layered on the entire inner wall of the hollow portion to form a soundproof material 15. Therefore, the soundproof material 11 made of urethane is filled in the grip portion 4. According to the above embodiment, the damping characteristic as shown in FIG. 7 (c) is exhibited, which is extremely effective.

(Embodiment 3) In the embodiment shown in FIGS. 3 and 4, the spiral soundproof material 13 (third embodiment) is provided without densely layering the soundproof material on the inner wall of the hollow portion.
Or a strip-shaped soundproof material 16 (Fig. 4),
The material is cork or urethane sheet, which has effective damping properties.

(Effects of the Invention) As described above, according to the present invention, since the soundproof material is provided in the hollow inside of the metal bat and at least in the taper portion on the grip side of the hitting portion, the swing characteristic is impaired. Without having to do so, an unpleasant sound can be eliminated by a slight increase in weight, and a metal bat excellent in soundproofing can be obtained.

Also, inside the hollow of the metal bat, the soundproof material is arranged in layers on the inner surface of the taper portion on the grip side of the hitting portion, and the grip portion is filled with the soundproof material, so that the weight increase of the bat is minimized. As a result, there is an effect that the soundproofing effect can be further improved, and an impact at the time of hitting can be prevented from being transmitted from the grip portion to the hand.

In addition, as shown in FIG. 2, when the soundproof material is layered on the entire inner wall of the hollow portion, there is an effect of showing excellent damping characteristics as shown in FIG. 7 (c). Furthermore, when the soundproof material is layered as shown in FIG. 3 or 4, there is an effect of showing an intermediate damping characteristic of FIGS. 7 (b) and 7 (c).

As described above, since the soundproofing process with different frequencies is performed on the inside of the hollow portion and the grip portion, there is an effect that the damping of the vibration at the time of hitting the ball becomes more remarkable.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of an embodiment in which a soundproof material is layered on the entire inner wall of the hollow portion,
FIG. 3 is a sectional view of an embodiment in which the soundproof material is spirally arranged on the entire inner wall of the hollow portion, and FIG. 4 is an enlarged sectional view of an embodiment in which the soundproof material is similarly arranged in a strip shape on the entire inner wall of the hollow portion. 5 and 6 are sectional views showing a conventional soundproofing method, and FIG. 7 (a).
Is a striking vibration diagram when untreated, (b) is a striking vibration diagram of taper part treatment, and (c) is a striking vibration diagram of all hollow part treatment. 1 ... Metal bat 2 ... Tip of bat 3 ... Tapered part, 4 ... Grip part 5 ... Grip end 10, 11 ... Soundproof material

Claims (3)

[Scope of utility model registration request] 1. A metal bat, characterized in that a soundproof material is adhered in layers inside a hollow of the metal bat, and the grip portion is filled with the soundproof material. 2. The metal bat according to claim 1, wherein the soundproofing material is provided on the entire hollow inner surface, in a spiral shape or in a strip shape in the axial direction. 3. The metal bat according to claim 1, wherein a soundproof material is provided in at least the tapered portion on the grip side inside the hollow of the metal bat.