JP4495027B2 - Ball bat - Google Patents

Description

  The present invention relates to a ball bat for use in ball games such as baseball and softball.

  Conventionally, in ball games such as soft and hard baseball and softball, a batter holding a ball bat hits the ball thrown back by the pitcher. At this time, when the ball is hit back at the so-called core portion of the ball game bat, a pleasant shot feeling and a long hit distance can be obtained (for example, see Patent Document 1).

JP 2001-58017 A

  However, the conventional ball game bat has the following problems. That is, the ball game bat has a problem that the grip part vibrates for a long time due to an impact when the ball is hit back. When the grip portion vibrates for a long time, it is difficult for a batter holding a ball bat to obtain a sharp shot feeling. In particular, when the ball of the ball game bat is removed and the ball is hit, unpleasant vibration continues for a long time, and the hand may be numb or feel pain.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a ball game bat that has a high vibration suppressing effect at the time of hitting and can obtain a sharp hit feeling.

The present invention is a ball game bat having a bat body portion and a grip portion extending from the bat body portion,
The grip portion includes a hollow grip body portion formed integrally with the bat body portion, and a grip end portion joined to an end portion of the grip body portion,
A vibration suppressing member for suppressing vibration is arranged inside the grip part,
The vibration suppressing member integrally by one piece of closed and the flange-like base portion, and a vibration isolating unit than base stand part protrudes a small diameter from the base stand part in the axial direction of the grip portion The base portion is fixed in a state where it is in contact with at least the grip body portion, and the vibration isolating portion is not restrained from the inner peripheral surface of the grip body portion. A gap is provided between the inner peripheral surface of the grip body part and the vibration isolator in the entire length of the vibration isolator,
The base portion of the vibration suppression member, Ri fixed tare by clamping by the end of the grip end portion and the grip body portion,
The anti-vibration part of the vibration suppression member has a columnar shape with a substantially uniform cross-sectional shape over substantially the entire length, or a shape with a cone or polygonal pyramid near the tip of the columnar shape, or a substantially uniform cross-sectional shape over a substantially full length. A ball game bat characterized by having a flat plate shape .

  In the ball game bat of the present invention, a vibration suppressing member for suppressing vibration is disposed inside the grip portion. As described above, the vibration suppressing member includes a base portion and a vibration isolating portion that protrudes from the base portion in the axial direction of the grip portion. The vibration suppressing member is fixed in a state in which the base part is in contact with the grip body part, and the vibration isolation part is disposed with a gap between the grip body part and the inner peripheral surface. It is.

Therefore, in the ball game bat, at least a part of the vibration energy transmitted from the bat main body portion to the grip portion is transmitted to the vibration suppressing member via the base portion. In the vibration suppressing member, the vibration isolating portion that is not restrained from the inner wall of the grip body portion absorbs the transmitted vibration energy and vibrates freely. Therefore, most of the vibration energy transmitted from the bat main body portion toward the grip portion is spent to vibrate the vibration isolation portion. Therefore, according to the ball game bat, the vibration energy transmitted to the batter's hand through the grip portion can be quickly attenuated, and a sharp shot feeling can be obtained.

  As described above, the ball game bat of the present invention has a high vibration suppressing effect at the time of hitting, and is excellent in obtaining a sharp hit feeling.

  Examples of the material of the bat main body and the grip portion in the present invention include metal materials such as aluminum alloy, titanium, and titanium alloy, fiber reinforced plastic (carbon fiber, glass fiber, etc. impregnated with a matrix resin), and the like. The resin material can be used. In any case, since the grip body portion can be formed hollow, it is easy to dispose the vibration isolating portion therein.

Moreover, as the above-mentioned vibration isolator, there are those having a substantially uniform cross section such as a substantially circular cylinder and a prism, and those having a shape such as a cone and a pyramid. Further, as will be described later, it can have a flat plate shape. Moreover, a hole can be drilled along the axis of the vibration isolator, a notch can be provided at the tip of the vibration isolator, and a plurality of vibration isolators are provided on one base. You can also.
Further, the base portion is preferably a columnar shape, and can be formed into a collar shape by reducing the thickness as in the embodiments described later. Moreover, the outer diameter is made larger than the vibration isolator.

Further, as the grip end portion, it is possible to employ a material that is hollowed out so that the grip body portion can be inserted, a plate material molded, or a material formed by forging.
And joining a grip end part and a grip body part has the method of welding both contact part, the method of providing a male screw part and a female screw part in both contact parts, and screwing together.

The base portion of the vibration suppressing member is fixed by being sandwiched between the grip end portion and the end portion of the grip body portion . Thereby , the fixed state of the vibration suppressing member can be made strong and stable. Therefore, the above-described vibration transmission and attenuation can be performed more efficiently.

In addition, a pressing member having a substantially annular shape is inserted between the end portion of the grip body portion and the base portion of the vibration suppression member, and is extrapolated to the vibration isolation portion of the vibration suppression member. It is preferable that the ring width, which is the difference between the inner radius and the outer radius of the pressing member, is larger than the thickness of the grip body .
In this case, the base part can be fixed with high reliability by causing the contact load from the grip body part to act on the base part via the pressing member.
The pressing member can be formed of various materials such as metals such as iron, aluminum, titanium, stainless steel, and copper, hard resin, and wood.

  Furthermore, by making the ring width of the pressing member larger than the thickness of the grip body part, it is possible to secure a wide area where the contact load acts from the grip body part toward the base part. And if the area where the contact load acts can be secured widely, the total amount of the contact load acting on the base part is increased while suppressing the contact load per unit area, and the base is further enhanced with certainty. The part can be fixed.

In addition, a substantially annular pressing piece having a through hole through which the vibration isolating portion of the vibration suppressing member is inserted is provided at the end of the grip body portion on the grip end portion side. Is preferred .
In this case, the base part can be pressed with the entire surface of the pressing piece located at the end of the grip body part, and the base part can be fixed with high reliability.

Moreover, the said vibration suppression member can also take the structure fixed by joining the said base part to the internal peripheral surface of the said grip body part .
More specifically, a method of bonding and fixing the base portion and the inner peripheral surface of the grip body portion with an adhesive, and providing a male screw thread on the outer peripheral surface of the base portion, For example, a method of providing a female screw thread on the inner peripheral surface and screwing them together can be used. In this case, the same effect as described above can be obtained.

Further, the anti-vibration unit of the vibration suppression member preferably has an average diameter of 5 to 20 mm, a length of columnar 20 to 50 mm (claim 2).
In this case, it is possible to effectively absorb the vibration component having a large influence on the hit feeling and quickly attenuate the vibration of the entire ball game bat.

Further, the anti-vibration unit of the vibration suppression member, it is also preferable that the thickness is plate shape of 0.1 to 20 mm (claim 3).
Also in this case, the vibration damping effect of the vibration isolator can be efficiently exhibited.

Further, the anti-vibration unit of the vibration suppression member is preferably formed with a plurality (claim 4). For example, two anti-vibration parts can be arranged opposite to each other, or three or more anti-vibration parts can be arranged symmetrically. Even in this case, an excellent vibration damping effect can be obtained.

Also, the vibration suppression member is a synthetic rubber or natural rubber, elastic body such as natural or synthetic resins, or preferably consists of that made of metal (claim 5).
As the elastic body, various synthetic rubbers, natural rubbers, synthetic resins, and natural resins (soft resins and the like) known as elastic bodies can be used. Specifically, various elastic bodies such as fluorine rubber, butyl rubber, and silicon resin can be applied.
Moreover, as said metal, various metals, such as an aluminum alloy and an iron alloy, are applicable. These metals are particularly suitable when, for example, the above-described flat plate-shaped vibration isolator is provided.
In any case, by appropriately selecting the formation and material, the elastic modulus of the vibration suppressing member becomes appropriate, and vibration components that impair the feel at impact can be effectively absorbed. Further, by adjusting the weight of the vibration suppressing member, it can act as an appropriate weight in the grip portion, which is useful for adjusting the weight balance of the ball game bat.

Example 1
This example is an example related to the ball game bat 1 including the vibration suppressing member 10 which is a member for improving the feel at impact. This content will be described with reference to FIGS.
As shown in FIG. 1, the ball game bat 1 of the present example includes a bat main body portion 21 and a grip portion 22 extending from the bat main body portion 21.
The grip 22 includes a hollow grip body 22a formed integrally with the bat body 21 and a grip end 22b joined to the end of the grip body 22a.

Here, as shown in FIG. 2, a vibration suppressing member 10 for suppressing vibration is arranged inside the grip portion 22. The vibration suppressing member 10 includes a flat base portion (hereinafter, referred to as a “rib portion” because it has a collar shape in this example) 11 and an anti-projection projecting from the collar portion 11 in the axial direction of the grip portion 22. The collar portion 11 is fixed by being sandwiched between the grip end portion 22b and the end portion of the grip body portion 22a. Furthermore, the vibration suppressing member 10 is disposed with a gap between the inner peripheral surface of the grip body 22a and the vibration isolator 12.
This will be described in detail below.

As shown in FIG. 1, the ball bat 1 of this example is joined to a cylindrical portion 20 including a bat main body portion 21 and a grip body portion 22a, and an opening end portion on the bat main body portion 21 side of the cylindrical portion 20. And a grip end portion (end cup) 22b that is screwed to the end portion on the grip portion 22 side.
The cylindrical portion 20 is composed of a large-diameter bat main body portion 21 and a small-diameter grip body portion 22a, and has a cylindrical shape with a middle portion formed in a tapered shape. And the external thread part 221 (FIG. 2) for screw-connecting the said grip end part 22b is provided in the outer periphery of the edge part of the grip trunk | drum 22a.

As shown in FIG. 1, the cap 210 is configured to be able to cover and join the opening end portion of the tubular portion 20, and has a bowl shape that has an opening shape substantially the same as the opening shape of the tubular portion 20. It is.
As shown in FIG. 2, the grip end portion (end cup) 22b constitutes the grip portion 22 together with the grip body portion 22a. On the surface of the grip end portion 22b on the grip body portion 22a side, a recessed portion 30 for receiving the end portion of the grip body portion 22a is provided. An internal thread portion 31 that engages with the external thread portion 221 of the grip body 22 a is provided on the inner peripheral surface of the recess portion 30.

  In this example, the cap 210, the bat main body portion 21, the cylindrical portion 20 including the grip body portion 22a, and the grip end portion 22b are all formed of an aluminum alloy. In addition to the aluminum alloy of this example, the material of the ball game bat 1 of this example is a metal material such as titanium or titanium alloy, or fiber reinforced plastic (carbon fiber, glass fiber or the like is impregnated with a matrix resin and cured. Resin materials such as those) can also be used.

As shown in FIG. 2, the ball game bat 1 of this example is characterized by the internal structure of the grip portion 22. A vibration suppressing member 10 for absorbing impact and vibration at the time of hitting a ball is disposed in the hollow inside of the grip body 22a in the grip 22.
As shown in FIG. 3, the vibration suppressing member 10 includes a 3 mm-thick plate-shaped flange portion (base portion) 11 having a diameter φT = 19.8 mm and an end portion of the vibration suppressing member 10. The vibration isolator 12 has a smaller diameter and a longer diameter φM = 12 mm and a length L = 20 to 50 mm in the axial direction. The vibration suppressing member 10 of this example is formed by molding fluororubber.

  As shown in FIG. 2, the vibration suppressing member 10 of the ball game bat 1 of the present example sandwiches the collar portion 11 between the bottom surface of the recessed portion 30 of the grip end portion 22b and the end portion of the grip body portion 22a. It is fixed by. In this example, an iron press that is formed between the end of the grip body 22a and the collar 11 so as to be externally inserted into the vibration isolator 12 and inserted into the grip body 22a. A member 35 is arranged. Therefore, in the ball game bat 1 of this example, the contact load that acts between the end of the grip body 22 a and the collar 11 acts through the pressing member 35. In this example, the inner radius and the outer radius of the pressing member 35 are 6 mm and 9.9 mm with respect to the end of the grip body portion 22a having an inner radius of 8.5 mm, an outer radius of 10.5 mm, and a thickness of 2 mm. That is, the pressing member 35 of this example has a ring width larger than the thickness of the end of the grip body 22a.

  Further, as shown in FIG. 2, the vibration suppressing member 10 in the ball game bat 1 of the present example is provided with a predetermined gap between the inner peripheral surface of the grip body 22 a and the outer peripheral surface of the vibration isolator 12. Is retained. Therefore, in this ball game bat 1, the vibration isolating portion 12 in the vibration suppressing member 10 to which the collar portion 11 is fixed is restrained from the inner peripheral surface of the grip body portion 22a in accordance with the impact generated at the time of hitting the ball. Can vibrate freely.

  Therefore, in the ball game bat 1 of this example, at least a part of the impact energy generated at the time of hitting the ball is converted into the vibration energy of the vibration isolator 12 and absorbed, so that it is transmitted to the batter's hand via the grip portion 22. Vibration can be quickly damped. Therefore, according to the ball game bat 1, a sharp feel at impact can be obtained.

  In addition, as a shape of the vibration isolator 12 in the vibration suppression member 10, as shown in FIG. 4, it can be set as various shapes besides the substantially cylindrical shape (A) of this example. For example, it may be a polygonal column shape (B), or may be formed in a substantially conical tip shape (C) or a polygonal pyramid shape. Furthermore, the thing (D) and (E) which perforated | pierced the hole from the end surface of the front end side of a ball game pad along the center axis | shaft of the vibration isolating part which exhibits a substantially cylindrical shape or polygonal shape may be sufficient. According to the hole drilled along the center axis of the vibration isolator 12, the lateral rigidity of the vibration isolator 12 can be suppressed and free vibration of the vibration isolator 12 can be promoted.

Furthermore, as shown in FIG. 5, the pressing member (reference numeral 35 in FIG. 2) can be omitted as a method of fixing the vibration suppressing member 10 provided with the collar portion 11 as in this example. A substantially annular pressing piece 222 provided with a through hole 220 through which the vibration isolator 12 is inserted is formed at the end of the grip body 22a in the figure.
According to the pressing piece 222, the number of parts can be reduced by substituting the pressing member.

(Example 2)
This example is an example in which the damping characteristic of the impact generated at the time of hitting is examined based on the ball game bat of the first embodiment. The contents will be described with reference to FIGS.
In this example, the damping characteristics of each ball game bat to which several types of vibration suppressing members having different vibration isolator lengths L (see FIG. 3) are attached are examined. Attenuation characteristics for each ball game bat are shown in FIGS. In the figure, the horizontal axis defines the time when the ball contact time, which is the moment when the ball bat and the ball come into contact, is zero, and the vertical axis indicates the grip portion (reference numeral 22 in FIG. 1). The vibration acceleration is specified.
As the length L of the vibration isolator, (A) 20 mm (B) 25 mm (C) 30 mm (D) 35 mm (E) 40 mm was set. FIG. 8F shows the damping characteristics of a ball game bat without a vibration suppressing member as a comparative example. In this example, the same fluororubber as in Example 1 was used as the material of the vibration suppressing member.

According to the figure, there is a clear difference in the damping characteristics between the ball game bats (A) to (E) with the vibration suppression member mounted and the ball game bat (F) with no vibration mounted. In a ball game bat equipped with a vibration suppressing member, the impact at the time of hitting is quickly attenuated and converged. Then, as shown in FIG. 7, this effect is most effective when the length L of the vibration isolator is about 30 mm to 35 mm, and the effect is reduced even if the length is longer than that. ing. In FIG. 7, the horizontal axis defines the length L of the vibration isolator, and the vertical axis represents the amplitude ratio (a value representing the level of vibration) measured by an FFT analyzer (model number OR24J-4 +) manufactured by OROS. It is prescribed.
In FIG. 7, the solid line a shows the amplitude ratio when the vibration suppressing member made of fluoro rubber is used, and the dotted line b shows the amplitude ratio when the vibration suppressing member made of butyl rubber is used as a reference. is there. Furthermore, a test result that the amplitude ratio is about 4500 m / s ² / N is obtained in the ball bat of the same specification without the vibration suppressing member.

  As shown in FIG. 7, the amplitude ratio of the ball game bat (solid line a) equipped with the vibration suppression member made of fluororubber is significantly suppressed compared to the amplitude ratio of the ball game bat without the vibration suppression member. Has been. That is, in the ball game bat equipped with the vibration suppressing member, the vibration caused by the impact at the time of hitting the ball is quickly attenuated and converged.

Furthermore, in this example, in order to compare and examine the change in the damping characteristics due to the difference in the material of the vibration suppression member, as shown in FIG. 8, a ball bat equipped with a vibration suppression member made of fluoro rubber and a vibration suppression made of butyl rubber A ball game bat equipped with a member (L = 35 mm) was prepared, and the attenuation characteristics of both were compared.
As shown in the figure, it can be seen that there is no significant change in the damping characteristics between the fluororubber (A) and the butyl rubber (B). That is, the presence / absence of the vibration suppression member and the length of the vibration suppression member are more dominant than the difference in the material of the vibration suppression member, and even if the material is changed, no significant change is observed in the damping characteristics. In addition, the same tendency as the above is also grasped from the comparison between the fluororubber (solid line a) and the butyl rubber (dotted line b) in FIG.

As described above, in the ball game bat provided with the vibration suppressing member of this example, the impact at the time of hitting is quickly attenuated. Therefore, the ball game bat has a high vibration suppressing effect at the time of hitting, and has excellent characteristics that can provide a sharp shot feeling. In particular, when the length L of the vibration isolator is set to about 30 to 35 mm, a high attenuation effect is obtained.
Other configurations and operational effects are the same as those in the first embodiment.

(Example 3)
This example is an example in which, based on Example 1, the relationship between the frequency of transmitted vibration and the amplitude ratio was examined by changing the length L of the vibration isolator. This content will be described with reference to FIGS.
In this example, the relationship between the frequency and the amplitude ratio, that is, the waveform of the transfer function is examined for each ball game bat to which several types of vibration suppression members having different vibration isolation lengths L are attached. Data on each ball game bat is shown in FIGS. 9 (A) to (C) and FIGS. 10 (D) to (E). In the figure, the horizontal axis defines the frequency, and the vertical axis defines the amplitude ratio. As the length L of the vibration isolator, FIG. 9 (A) 20 mm, FIG. 9 (B) 25 mm, FIG. 9 (C) 30 mm, FIG. 10 (D) 35 mm, and FIG. In addition, FIG. 10F shows data of a ball game bat without a vibration suppressing member as a comparative example. In this example, the same fluororubber as in Example 1 was used as the material of the vibration suppressing member.

  9 and 10, it can be seen that when the length L of the vibration isolator is 25 mm or less, the waveform of the transfer function is almost the same as that of the ball bat without the vibration suppressing member. . Furthermore, it can be seen that the peak height of the amplitude ratio on the low frequency side of about 180 Hz in the above transfer function has a correlation with the attenuation characteristics shown in FIGS. 6 and 7 in the second embodiment. That is, when the length L of the vibration isolator is 30 mm (FIG. 9C) or 35 mm (FIG. 10D), the peak height at 180 Hz is suppressed, and hence excellent attenuation characteristics. Is obtained (see FIGS. 6 and 7).

  On the other hand, it can be seen that the peak height of the amplitude ratio on the high frequency side of about 800 Hz in the above transfer function has a low correlation with the attenuation characteristics shown in FIGS. That is, when the length L of the vibration isolator is 40 mm (FIG. 10E), the peak height at 800 Hz is minimized, but a good attenuation characteristic is not necessarily obtained (FIGS. 6 and 6). 7).

In this example, as shown in FIGS. 11 and 12, the material of the vibration suppressing member was changed to butyl rubber, and the relationship between the frequency and the amplitude ratio, that is, the waveform of the transfer function was examined in the same manner as described above. Data about each ball game bat are shown in FIGS. 11 (A) to 11 (C) and FIGS. 12 (D) and 12 (E). In the figure, the horizontal axis defines the frequency, and the vertical axis defines the amplitude ratio. As the length L of the vibration isolator, FIG. 11 (A) 20 mm, FIG. 11 (B) 25 mm, FIG. 11 (C) 30 mm, FIG. 12 (D) 35 mm, and FIG.
According to the figure, it can be seen that even if the material of the vibration suppressing member is changed to butyl rubber, a result having the same tendency as the above-described fluoro rubber can be obtained.

Example 4
In this example, as shown in FIG. 13, the structure of the grip end portion 22 in the ball game bat 1 of the first embodiment is partially changed.
That is, as shown in the figure, the pressing member 35 (FIG. 2) interposed between the end portion of the grip body portion 22a and the collar portion 11 in the first embodiment is omitted, and the end portion of the grip body portion 22a is directly used. In this example, the collar portion 11 is pressed. Other structures are the same as those in the first embodiment.
In this case, the number of parts can be reduced, and cost reduction and process rationalization can be achieved. In other respects, the same effects as those of the first embodiment can be obtained.

(Example 5)
In this example, as shown in FIG. 14, the structure of the grip end portion 22 in the ball game bat 1 of the first embodiment is partially changed.
That is, as shown in the figure, first, the pressing member 35 (FIG. 2) interposed between the end of the grip body 22a and the collar 11 in the first embodiment is omitted, and the end of the grip body 22a is omitted. The flange portion 11 is directly pressed by the above.

Furthermore, as shown in the figure, the inside of the grip end portion 22b was made hollow, and a hollow portion 37 was also provided around the insertion portion of the grip body 22a. The grip end portion 22b and the grip body portion 22a were joined to each other by a welded portion 39 in which the contact portion was welded without providing a female screw portion and a male screw portion. Other structures are the same as those in the first embodiment.
Also in this case, substantially the same effect as that of the first embodiment can be obtained.

(Example 6)
In this example, as shown in FIG. 15, the structure of the grip end portion 22 in the ball game bat 1 of the first embodiment is partially changed.
That is, first, as shown in the figure, the base portion 13 of the vibration suppressing member 10 is made thicker than the base portion (collar portion) 11 of the first embodiment, and the male screw portion 136 is formed on the outer peripheral surface thereof. Was provided. A female screw portion 226 that can be screwed into the male screw portion 136 is provided on the inner peripheral surface of the grip body portion 22a. The base portion 13 of the vibration suppressing member 10 and the inner peripheral surface of the grip body portion 22a are fixed by the screw connection between the male screw portion 136 and the female screw portion 226.

Moreover, the pressing member 35 (FIG. 2) in Example 1 is omitted by adopting the fixing structure.
Further, the connection between the grip end portion 22b and the grip body portion 22a is the same screw connection as in the first embodiment.
Other structures are the same as those in the first embodiment.
Also in this case, substantially the same effect as that of the first embodiment can be obtained.

(Example 7)
In this example, as shown in FIG. 16, the structure of the grip end portion 22 in the ball game bat 1 of the first embodiment is partially changed.
That is, first as in the sixth embodiment, as shown in the figure, the base portion 13 in the vibration suppressing member 10 is made thicker than the base portion (collar portion) 11 in the first embodiment. An external thread 136 was provided on the outer peripheral surface. A female screw portion 226 that can be screwed into the male screw portion 136 is provided on the inner peripheral surface of the grip body portion 22a. The base portion 13 of the vibration suppressing member 10 and the inner peripheral surface of the grip body portion 22a are fixed by the screw connection between the male screw portion 136 and the female screw portion 226.

Moreover, the pressing member 35 (FIG. 2) in Example 1 is omitted by adopting the fixing structure.
Similarly to the case of the fifth embodiment, the inside of the grip end portion 22b is hollow, and a hollow portion 37 is provided around the insertion portion of the grip body 22a. The grip end portion 22b and the grip body portion 22a were joined to each other by a welded portion 39 in which the contact portion was welded without providing a female screw portion and a male screw portion. Other structures are the same as those in the first embodiment.
Also in this case, substantially the same effect as that of the first embodiment can be obtained.

(Example 8)
In this example, as shown in FIG. 17, the structure of the grip end portion 22 in the ball game bat 1 of the first embodiment is partially changed.
That is, as shown in the figure, the inside of the grip end portion 22b is hollow, but the size of the hollow portion 38 is made smaller than in the case of the fifth and seventh embodiments, whereby the grip body portion 22a and The screw contact area was increased to maintain the screw connection.
Other structures are the same as those in the first embodiment.
Also in this case, substantially the same effect as that of the first embodiment can be obtained.

Example 9
In this example, as shown in FIGS. 18 and 19, a modification of the vibration suppressing member 10 used in Example 1 is shown.
The vibration suppressing member 10 shown in FIG. 18 is an example in which the vibration isolator 12 is made of a flat plate-shaped aluminum alloy having a thickness of 3 mm.
The vibration suppressing member 10 shown in FIG. 19 is an example in which two vibration isolation parts 121 and 122 are provided. In this example, a vibration isolator 123 can be further provided.
Even if it is the vibration suppression member 10 of any shape, the same outstanding vibration suppression effect as the case of Example 1 can be exhibited.

The side view which shows the external appearance of the bat for ball games in Example 1. FIG. FIG. 3 is an enlarged cross-sectional view illustrating a cross-sectional structure of a grip portion in the first embodiment. FIG. 3 is a perspective view showing a vibration suppressing member in the first embodiment. The perspective view which shows the shape of the other vibration suppression member in Example 1. FIG. Explanatory drawing explaining the other fixation structure of the vibration suppression member which has a collar part in Example 1. FIG. 9 is a graph for explaining the relationship between the length of a vibration-proof portion of a vibration suppressing member and damping characteristics in Example 2. The graph which showed the relationship between the length of the vibration isolator of the vibration suppression member in Example 2, and an amplitude ratio. 9 is a graph for explaining a relationship between a material of a vibration suppressing member and damping characteristics in Example 2. Graph 1 showing the relationship between the frequency and the amplitude ratio in Example 3. The graph 2 which shows the relationship between a frequency and an amplitude ratio in Example 3. Graph 3 showing the relationship between the frequency and the amplitude ratio in Example 3. Graph 4 showing the relationship between the frequency and the amplitude ratio in Example 3. The expanded sectional view which shows the cross-section of the grip part in Example 4. FIG. 9 is an enlarged cross-sectional view showing a cross-sectional structure of a grip part in Example 5. The expanded sectional view which shows the cross-section of a grip part in Example 6. FIG. FIG. 9 is an enlarged cross-sectional view showing a cross-sectional structure of a grip part in Example 7. FIG. 10 is an enlarged cross-sectional view showing a cross-sectional structure of a grip part in Example 8. FIG. 10 is a perspective view showing a vibration suppressing member in Example 9. The perspective view which shows the vibration suppression member of the other example in Example 9. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ball game bat 10 Vibration suppression member 11, 13 Base part (collar part)
12 Anti-vibration part 2 Cylindrical part 21 Bat body part 22 Grip part 22a Grip body part 22b Grip end part (end cup)
30 dent

Claims (5)

A ball game bat having a bat body portion and a grip portion extending from the bat body portion,
The grip portion includes a hollow grip body portion formed integrally with the bat body portion, and a grip end portion joined to an end portion of the grip body portion,
A vibration suppressing member for suppressing vibration is arranged inside the grip part,
The vibration suppressing member integrally by one piece of closed and the flange-like base portion, and a vibration isolating unit than base stand part protrudes a small diameter from the base stand part in the axial direction of the grip portion The base portion is fixed in a state where it is in contact with at least the grip body portion, and the vibration isolating portion is not restrained from the inner peripheral surface of the grip body portion. A gap is provided between the inner peripheral surface of the grip body part and the vibration isolator in the entire length of the vibration isolator,
The base portion of the vibration suppression member, Ri fixed tare by clamping by the end of the grip end portion and the grip body portion,
The anti-vibration part of the vibration suppression member has a columnar shape with a substantially uniform cross-sectional shape over substantially the entire length, or a shape with a cone or polygonal pyramid near the tip of the columnar shape, or a substantially uniform cross-sectional shape over a substantially full length. A ball game bat characterized by a flat plate shape .   2. The ball game bat according to claim 1, wherein the vibration isolation portion of the vibration suppressing member has a columnar shape having an average diameter of 5 to 20 mm and a length of 20 to 50 mm.   The ball game bat according to claim 1, wherein the vibration-proof portion of the vibration suppressing member has a flat plate shape with a thickness of 0.1 to 20 mm.   The ball game bat according to any one of claims 1 to 3, wherein a plurality of the vibration isolating portions of the vibration suppressing member are formed.   The ball game bat according to any one of claims 1 to 4, wherein the vibration suppressing member is made of synthetic rubber or natural rubber, natural resin or synthetic resin, or metal.

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