JP2003284799A - Bat for practice - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a practice bat that is superior in impact relief and vibration absorption at the time of hitting and does not bring about numbness and pain to the hand even if bunt hitting practice is performed repeatedly. <P>SOLUTION: This is a bunt practice bat that has an auxiliary grip member 6 having elasticity within the range of 0.46-0.72L of the total length L of the bat from the grip end part. The auxiliary grip member 6 is made of a double layer structure made of a relatively thick elastic layer 8 and a thermal shrinkage tube 11 provided on its surroundings, and the above elastic layer 8 is made firmly pressure-contact and fitted with the inside of the annular recessed groove 10 formed on the surface of the bat body 7 by the shrinkage pressure of the thermal shrinkage tube 11. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bat used for hitting practice of baseball, softball, etc., and particularly to reduce the impact and vibration transmitted to the player's hand when practicing a bunt. It concerns a training bat.

[0002]

2. Description of the Related Art Generally, batting practice such as baseball and softball includes batting practice that involves a normal swing and bunt training that does not involve the swing. In the former batting practice involving a swing, it is required to reliably catch the ball thrown by the pitcher with the core of the bat and to extend the speed, sharpness, and flight distance of the batting.
Mostly, the batting form and the batting position are checked, and it is possible to sufficiently achieve the purpose even by practicing with a practice bat other than the bat actually used in the game. Examples of practice bats of this type include, for example, Syokai 53-1.
As proposed in No. 2063, a batting practice bat in which the surface of the batting part is made of rubber, and an actual open flat 4-4286.
As proposed in No. 2, a so-called simulated bat, such as a practice baseball bat in which the hitting portion of the bat is composed of a cushioning material, is known.

On the other hand, in the latter practice of the bunt, it is required that the ball thrown by the pitcher is lost to some extent, and the ball is accurately rolled at a target place. By adjusting the force level and timing of the ball, you can visually check the rolling condition of the ball (distance, hitting speed, etc.). Therefore, in practice based on such a tactile check, the rolling condition of the ball will appear completely different due to the difference in the repulsion characteristics of the bat used in the practice. I can't
In many cases, a bat actually used in a game or a bat similar to this is used for practice.

As shown in FIG. 12, a bat 41 conventionally used for practicing such a bunt, including for a game, is held by a player's hand with a large-diameter hitting portion 42 for hitting the ball. The small-diameter grip portion 43 and the taper portion 44, which is tapered from the hitting portion 42 toward the grip portion 43, are integrally formed of wood, metal, or fiber reinforced resin. In general, the grip portion 43 is wound around and covered with a grip tape 45 formed of natural leather or synthetic leather.

[0005]

By the way, unlike a normal swing striking in which the grip portion is held by both hands, in the bunt, while the grip portion is held by one hand,
Since the batting form is used such that the other hand is directly put on the taper part, the impact and vibration generated at the time of hitting the ball are transmitted to the player's hand from the hitting part of the bat through both the taper part and the grip part. . However, in the bat having the conventional structure as described above, impact mitigation at the time of hitting, and vibration absorption depend on only a slight elasticity of the grip tape itself wound and coated on the grip portion, and therefore impact mitigation and In terms of vibration absorption, there is a problem that it is difficult to obtain a sufficient effect, and since there is no means for absorbing and relaxing shocks and vibrations in the taper region where the other hand is attached, There is a problem that the generated shock and vibration are not attenuated but propagated as they are to the player's hand through the tapered portion. In particular, as shown in FIG. 12, the taper portion region corresponds to the antinode of the primary bending vibration M that the player feels most, among the natural vibration modes generated at the time of striking, and the impact at the time of striking is the most. It will be an area where it will act significantly. Therefore, a large impact is likely to be transmitted to the hand attached to the area when hit, resulting in numbness or pain, and repeated practice of hitting increases fatigue on fingers and palms and induces sports disorders. I was afraid.

In view of such conventional problems, the present invention is excellent in shock mitigation and vibration absorption at the time of hitting, and does not cause numbness or pain in the hands even if the bunt hitting exercise is repeatedly performed. It is intended to provide a bat for use.

[0007]

In order to achieve the above object, the present invention has the following constitution. That is, the practice bat according to claim 1 of the present invention is a bun practice bat, and the bat length L of 0.
An auxiliary grip member having elasticity is disposed on the surface of the bat body within the range of 46L to 0.72L.

A second aspect of the present invention is the practice bat according to the first aspect, wherein the auxiliary grip member is provided with an elastic layer that covers the surface of the bat body, and is arranged around the elastic layer. A heat-shrinkable tube, and the elastic layer is pressed and fixed to the surface of the bat body by the shrinking pressure of the heat-shrinkable tube that is shrunk by heating.

A third aspect of the present invention is the practice bat according to the first aspect, wherein the auxiliary grip member is disposed on an elastic layer that covers the surface of the bat body, and is arranged around the elastic layer. The elastic material layer is made of a highly stretchable tube material, and the elastic material layer is pressed and fixed to the surface of the bat body by the tightening pressure of the tube material that is spread and covered around the elastic material layer. It is characterized by.

A fourth aspect of the present invention is the practice bat according to the first, second or third aspect, wherein the auxiliary grip member is arranged in a concave groove provided around the surface of the bat body, and Both end portions in the longitudinal direction of the auxiliary grip member are configured to abut on the side walls of the recessed groove.

A fifth aspect of the present invention is the first, second, third or fourth aspect.
The practice bat according to the present invention is characterized in that the surface of at least both longitudinal end regions of the auxiliary grip member is flush with the surface of the bat body.

A sixth aspect of the present invention is the practice bat according to the fourth or fifth aspect, wherein the elastic layer constituting the auxiliary grip member is formed shorter than the longitudinal length of the groove. A heat-shrinkable tube that covers the elastic layer and is formed to have a thickness substantially the same as the depth of the groove, or both longitudinal ends of the tube material is configured to abut the side wall of the groove. It is characterized by that.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) The present invention will be described below with reference to the preferred embodiments described in detail with reference to the drawings. FIG. 1 is an external view of the practice bat of this embodiment, and FIG.
FIG. 2A is an external view of a main part of a region from a hitting portion to a tapered portion of a practice bat of the present embodiment, and FIG. 2B is a configuration explanatory view thereof.

That is, the practice bat 1 of the present embodiment, as shown in FIG. 1, has a large-diameter hitting portion 2 for hitting a ball,
A small-diameter grip portion 3 that is held by the player's hand, and
An area of the taper part 4 which comprises a taper part 4 which is tapered from the hitting ball part 2 toward the grip part 3 and which is attached with the other hand opposite to the hand holding the grip part 3 at the time of bunt hitting. Of the above, an auxiliary having elasticity on the surface of the bat body in the region corresponding to the antinode of the primary bending vibration M that occurs at the time of impact (within the range of 0.46L to 0.72L of the butt total length L from the grip end portion 5) Grip member 6
Is arranged.

As shown in FIGS. 2 (a) and 2 (b), the auxiliary grip member 6 in this embodiment is formed of a relatively thick elastic layer 8 and is formed on the surface of the bat body 7. It is configured to be adhesively fixed using a double-sided tape or the like.

In the practice bat 1 of this embodiment as described above, when practicing hitting the bunt, an auxiliary member having elasticity is provided in a region to which the other hand opposite to the hand holding the grip portion 3 is attached. Since the grip member 6 is provided, the impact and vibration transmitted to the hand through the area at the time of hitting the ball can be significantly suppressed and relaxed, and the hand can become numb even if the hitting practice is repeated for a long time. There is no pain. In addition, the auxiliary grip member 6 has a region corresponding to the antinode of the primary bending vibration M that occurs at the time of hitting the ball, in the region of the tapered portion 4 to which the hand is attached (0 from the grip end portion 5 to the bat total length L). Since it is arranged within a range of 0.46L to 0.72L), the elastic auxiliary grip member 6 effectively absorbs and attenuates the vibration energy of the antinode portion having a large vibration amplitude. The effect is exerted, and the unpleasant vibration transmitted to the player's hand at the time of hitting the ball can be further suppressed and relaxed.

(Second Embodiment) FIGS. 3A and 3B show a practice bat 21 according to a second embodiment. That is, the second embodiment
In the practice bat 21, the auxiliary grip member 6 arranged on the surface of the bat body 7 is formed by a tubular tube material 9 having excellent elasticity, as shown in FIG. 3 (b). In addition, the tube material 9 is
Is formed so as to have an inner diameter smaller than that of the bat body 7 in the region where the tub body 7 is arranged, and the tube material 9 is spread on the surface of the bat body 7 to cover the surface of the bat body 7. It is configured to be pressed and fixed to the surface of the bat body 7.

According to this structure, the tube material 9 can be freely attached and detached, so that the tube material 9 can be easily replaced when the tube material 9 becomes dirty or damaged by repeated use. Also, the arrangement position of the tube material 9 can be freely changed.

(Third Embodiment) FIGS. 4 to 5 show a practice bat 31 according to a third embodiment. That is, in the practice bat 31 of the third embodiment, the annular concave groove 10 is formed on the surface of the bat body 7 within the range of 0.46L to 0.72L of the bat overall length L from the grip end portion 5, The auxiliary grip member 6 is arranged in the groove 10. The auxiliary grip member 6 has a two-layer structure including a relatively thick elastic layer 8 and a heat-shrinkable tube 11 arranged around the elastic layer 8, and the elastic layer 8 shrinks due to heating. The shrinkage pressure of the heat-shrinkable tube 11 is firmly fixed by pressure in the groove 10.

In the third embodiment, as shown in FIG. 5, the length T2 of the elastic layer 8 in the longitudinal direction is shorter than the length T1 of the groove 10 in the longitudinal direction. Both longitudinal end portions 12 of the groove 8 are separated from the side wall 13 of the groove 10 by a length T3 of about 5 mm to 10 mm. In addition, the heat-shrinkable tube 11
Is configured to have a thickness S2 that is substantially the same as the depth S1 of the groove 10, and the longitudinal end portions 14 of the heat-shrinkable tube 11 that covers the elastic layer 8 have the groove S1.
The bat body 7 is configured to come into contact with the side wall 13 of 0.
Is formed so as to be flush with the surface 15 of the above.

Such a practice bat 31 of the third embodiment
Since the auxiliary grip member 6 has a two-layer structure composed of the elastic layer 8 and the heat-shrinkable tube 11 covering the elastic layer 8, the thermoplastic tube 1
By 1, the deterioration of the elastic layer 8 and damage such as abrasion can be prevented. Further, as a method of fixing the elastic layer 8 to the bat body 7, an adhesive means using a thermosetting resin adhesive or the like is usually considered, but in such an adhesive means, the adhesive is There is a possibility that the original flexibility of the elastic layer 8 itself may be hindered by penetrating into the elastic layer 8 and hardening, and the adhesive strength is reduced due to repeated impact and vibration, and the continuation There is a possibility that the elastic layer 8 may be peeled off from the bat body 7 due to the general use. In the practice bat 31 of the third embodiment, the elastic layer 8 is configured to be pressed and fixed to the surface of the bat body 7 by the contraction pressure of the heat-shrinkable tube 11 that is shrunk by heating. The above-mentioned problems do not occur, and stable fixation can be always performed for a long period of time.

Further, in the third embodiment, the auxiliary grip member 6 is arranged in the annular groove 10 formed in the surface of the bat body 7, and the depth S1 of the groove 10 is approximately the same as the depth S1 of the groove 10. Both ends 14 in the longitudinal direction of the heat-shrinkable tube 11 configured to have the same wall thickness S2 have the concave groove 10 formed therein.
Since it is configured to contact the side wall 13 of
The auxiliary grip member 6 does not slide in the longitudinal direction of the bat body 7 to cause a shift. Further, in the region where the longitudinal end portions 14 of the heat-shrinkable tube 11 and the side wall 13 of the groove 10 are in contact with each other, a flat surface having no step is formed, so that a hand is caught in the region. It does not cause any problems and has a beautiful appearance.

Such a practice bat 31 of the third embodiment
6, the bat body 7 in which an annular groove 10 is provided in advance in a region corresponding to a range of 0.46L to 0.72L of the butt total length L from the grip end portion 5 as shown in FIG. After that, as shown in FIG. 7, the bottom wall 16 of the groove is covered with the elastic sheet 17 forming the elastic layer 8 by using a double-sided tape or the like. Then, after covering the wound elastic sheet 17 with the heat-shrinkable tube 11, the heat-shrinkable tube 11 is heated in a heating furnace, or by directly heating the heat-shrinkable tube 11, as shown in FIG. As shown in FIG. 3, the practice bat 31 of the present embodiment is made by shrinking the heat-shrinkable tube 11.
Is molded.

In the third embodiment, the elastic layer 8 is pressed and fixed to the surface of the bat body 7 by the contracting pressure of the heat-shrinkable tube 11 which is shrunk by heating. In this embodiment, the heat-shrinkable tube 11 is not limited to the pressure contact fixing means, and although not shown, the heat-shrinkable tube 11 is replaced with a tube having excellent elasticity on the surface of the elastic layer 8. It is also possible to adopt a fixing means in which the material 9 is expanded and covered and the elastic layer 8 is pressed and fixed to the surface of the bat body 7 by utilizing the tightening pressure of the tube material 9. With such a press-contact fixing means using the tube material 9, the tube material 9 can be freely attached and detached, so that the elastic layer 8 covered with the tube material 9 can also be attached and detached. The reassembling work for the purpose of changing the thickness and material can be easily done.

Examples of the material constituting the elastic layer 8 in the present invention include natural resins such as natural rubber, polyvinyl chloride-based, polyurethane-based, polystyrene-based, ethylene vinyl acetate copolymerized, and polyolefin-based synthetic materials. A resin or synthetic rubber, for example, a foamed elastic body formed from a material having elasticity such as a styrene-ptadiene-based, chloroprene-based, butadiene-based, butyl-based, ethylene / propylene-based, acrylic-based, or silicon-based rubber, or A solid elastic body or the like is preferable.

As the material forming the heat-shrinkable tube 11, for example, an ethylene-propylene heat-shrinkable tube, a polyolefin heat-shrinkable tube, a silicon heat-shrinkable tube, a fluororesin heat-shrinkable tube, or the like is used. be able to.

Further, examples of the material forming the tube material 9 include a soft rubber tube having excellent elasticity.

In the present invention, as shown in FIG. 9, a grip member 18 having the same structure as the auxiliary grip member 6 described in this embodiment may be arranged in the grip portion 3. good. In this case, shock and vibration transmitted to the hand holding the grip portion 3 can be further suppressed and relaxed.

[0029]

EXAMPLE As shown in FIGS. 4 to 5, an annular recessed groove 10 (having a depth S1 of 1. 5
mm) is formed, and an elastic layer 8 made of polyurethane resin foam is formed in the groove 10
A practice bat having a structure in which an auxiliary grip member 6 having a two-layer structure including a heat-shrinkable tube 11 of polyolefin and a polyolefin-based heat-shrinkable tube 11 is arranged is formed. The elastic layer 8 has a longitudinal length T2 similar to that of the practice bat 31 of the above-described third embodiment, and a longitudinal length T2 of the concave groove 10 is 180 m.
m), which is shorter than 160 m, and both ends 12 in the longitudinal direction of the elastic layer 8 are formed on the side wall 1 of the concave groove 10.
It was configured to be separated from each other by a length T3 of 10 mm. In addition, the heat shrinkable tube 11 has the concave groove 10
Has a thickness S2 (1.5 mm) that is substantially the same as the depth S1 of the heat shrinkable tube 11, and the longitudinal end portions 14 of the heat-shrinkable tube 11 that covers the elastic layer 8 are formed in the recessed groove 10.
It is configured to abut the side wall 13 of the bat body 7 and to form a flush surface with the surface 15 of the bat body 7.

The following tests were carried out on the practice bats of the above-mentioned examples in order to confirm the effects of impact relaxation and vibration absorption at the time of hitting.

That is, in order to confirm the shock and vibration transmitted to the area of the tapered portion 4 to which the hand opposite to the hand holding the grip portion is attached, as shown in FIG.
A practice bat having an accelerometer 19 mounted at a position (550 mm from the grip end portion 5 (0.65 L of the bat total length L)) is hung with a rubber belt 20 and the hitting ball portion 2 is hit with an impulse hammer 22. In doing so, the FFT analyzer 23 measures the signals of the acceleration generated in the accelerometer attached to the impulse hammer 22 and the acceleration generated in the accelerometer 19 attached to the taper portion, and the response strength is obtained from the ratio. And used as an index of impact relaxation. The smaller the ratio, the higher the impact relaxation degree. Also, in the above test, the taper portion 4
The logarithmic attenuation rate was obtained from the acceleration waveform generated in the accelerometer 19 attached to the table and used as the index of vibration absorption. The larger the logarithmic damping rate, the higher the damping of vibrations.

At the same time, in order to confirm the shock and the vibration transmitted to the grip portion 3, the accelerometer 19 is attached to the grip portion 3 (a position 100 mm from the grip end portion 5) as shown in FIG. Similarly to the above, the ball hitting portion 2 is hit with an impulse hammer 22, and the acceleration signal generated in the accelerometer attached to the impulse hammer 22 and the acceleration signal generated in the accelerometer 19 attached to the grip portion 3 are sent to the FFT analyzer 23. Was measured. The measurement results at this time are shown in Table 1 below. For comparison with this example, a bat without the auxiliary grip member 6 was similarly measured as a comparative example.

[0033]

[Table 1]

From the above measurement results, it was confirmed that the practice bat of this example provided excellent effects in shock relaxation and vibration absorption.

[0035]

INDUSTRIAL APPLICABILITY As described above, the practice bat of the present invention is excellent in shock absorption and vibration absorption at the time of hitting, and does not cause numbness or pain in the hand even when practicing hitting the bunt repeatedly. .

[Brief description of drawings]

FIG. 1 is an explanatory view of the appearance of a practice bat of this embodiment.

FIG. 2 is an explanatory view of a main configuration of a region from a hitting portion to a taper portion of a practice bat of Example 1.

FIG. 3 is an explanatory diagram showing a practice bat of Example 2.

FIG. 4 is an explanatory diagram showing a practice bat of Example 3.

FIG. 5 is an explanatory diagram showing a practice bat of Example 3.

FIG. 6 is an explanatory view showing a method for manufacturing a training bat of Example 3.

FIG. 7 is an explanatory view showing a method for manufacturing a practice bat of Example 3.

FIG. 8 is an explanatory view showing a method for manufacturing a practice bat of Example 3.

FIG. 9 is an explanatory diagram showing another embodiment.

FIG. 10 is an explanatory diagram showing a shock and vibration measuring method.

FIG. 11 is an explanatory diagram showing a method of measuring shock and vibration.

FIG. 12 is an external view of a conventional bat.

[Explanation of symbols]

1 practice bat 2 ball hitting section 3 grip part 4 Tapered part 5 Grip end 6 Auxiliary grip member 7 Bat body 8 Elastic layer 9 tube material 10 groove 11 Heat-shrinkable tube 12 Both ends 13 Side wall 14 both ends 15 surface 16 bottom wall 17 Elastic sheet 18 Grip member 19 accelerometer 20 belts 21 practice bat 22 Impulse hammer 23 FFT Analyzer 31 practice bat 41 Bat 42 ball hitting section 43 Grip part 44 Tapered part 45 grip tape

Claims (6)

[Claims] 1. A bat for practicing bunting, which is 0.46L to 0.72L of the entire length L of the bat from the grip end portion.
A bat for practice, characterized in that an auxiliary grip member having elasticity is disposed on the surface of the bat body within the range. 2. The auxiliary grip member comprises an elastic layer covering the surface of the bat body and a heat-shrinkable tube arranged around the elastic layer, wherein the elastic layer is heated. The practice bat according to claim 1, wherein the practice bat is fixed by pressure contact with the surface of the bat body by the contraction pressure of the heat-shrinkable tube contracted by. 3. The elastic grip layer comprises an elastic layer that covers the surface of the bat body, and a tube material that is disposed around the elastic layer and has excellent elasticity. 2. The training bat according to claim 1, wherein the bat is fixed by pressure to the surface of the bat body by the tightening pressure of the tube material which is expanded and covered around the elastic layer. 4. The auxiliary grip member is disposed in a groove formed around the surface of the bat body, and both longitudinal end portions of the auxiliary grip member are in contact with the side walls of the groove. It is constituted, Claim 1, characterized by the above-mentioned.
The practice bat described in 2 or 3. 5. The surface of at least both longitudinal end regions of the auxiliary grip member forms a flush surface with the surface of the bat body without a step. The practice bat described in 4. 6. An elastic body layer forming the auxiliary grip member is formed to be shorter than a longitudinal length of the recessed groove, covers the elastic body layer, and has substantially the same thickness as the depth of the recessed groove. The practice bat according to claim 4 or 5, wherein both ends of the heat-shrinkable tube or the tube material formed in thickness in the longitudinal direction are in contact with the side walls of the groove. .