JP2003236019A - Vibration absorbing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration absorbing member which can obtain functions (beat) as a desired vibrator to match the natural frequency of a striking tool, absorb and ease impact vibrations generated during the striking quickly and moreover, sustain a prolonged stable absorbing capacity. <P>SOLUTION: The member comprises a bar-shaped mass body 4 acting as a vibrator and an elastic material 5 covering the circumference of the mass body 4. The elastic material 5 has a double-layer structure which comprises an inner foaming elastic material layer 6 directly covering the circumference of the mass body 4 and an outer elastic material layer 7 stacked on the circumference of the inner foaming elastic material layer 6 to cover it while having an elastic deformation area smaller than that of the inner foaming elastic material layer 6. An adhesive layer 8 such as an adhesive double-coated tape is interposed between the stacked layers of the inner foaming elastic material layer 6 and the outer elastic material layer 7. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration absorbing member having a remarkably excellent function of absorbing and mitigating impact vibration generated in a hitting tool such as a racket frame or a baseball bat.

[0002]

2. Description of the Related Art Conventionally, various vibration absorbing members have been attached to a hitting tool such as a racket frame or a baseball bat for the purpose of suppressing and mitigating shock and vibration transmitted to a player's hand at the time of hitting. Among these, in recent years, as one means for effectively suppressing and mitigating impact and vibration at the time of impact, a vibration absorbing member called a "dynamic damper", which has a dynamic vibration absorbing function, is provided as a grip end of the impact tool. A shock and vibration reduction measure that has been attached to the has been proposed and is attracting attention.

For example, in Japanese Unexamined Patent Publication (Kokai) No. 5-76621, a vibration absorbing member, in which a rod-shaped weight acting as a vibrator is embedded in an elastic body, is mounted in a grip end.
Shock vibration (vibration energy) generated in the racket frame
Is converted into kinetic energy of the weight of the vibration absorbing member so that the vibration energy is absorbed and a high absorbing ability is exhibited, and it is known.

By the way, in the proposal of this kind, as a constitution of the vibration absorbing member, as shown in FIG.
The elastic body 22 for covering the elastic body 22 is formed of a single layer including only the elastic foam layer 23, and as shown in FIG. 6, the elastic body layer 23 is further harder than the elastic foam layer 23 outside of the elastic foam layer 23. There is disclosed a structure in which the elastic layer 24 is covered and laminated.

In the structure of the conventional vibration absorbing member, the weight 21 and the foamed elastic body 23, or the foamed elastic body layer 23 and the elastic body layer 24 are simply laminated and are not integrated. As shown in FIGS. 7 (a) and 7 (b), the weight 21 and the foamed elastic layer 2 are subjected to an external impact.
3 or between the foamed elastic body 23 and the elastic body layer 24, an extra movement accompanied by a shearing direction deviation is likely to occur,
It is predicted that it is difficult to obtain the desired function (vibration) as a vibrator that matches the natural frequency of the racket frame.

Therefore, in recent years, for the purpose of improving the level of the dynamic vibration absorbing function, Japanese Patent Application Laid-Open No. 8-257170.
In FIG. 8, as shown in FIG. 8, a vibrator main part 26 in which a weight 21 acting as a vibrator is covered and laminated with a foam elastic body layer 23 and a solid elastic body layer 25 is compressed into a hard case 27. A vibration absorbing member that can be stored is proposed and known.

[0007]

According to this type of vibration absorbing member, since the vibrator main part 26 is compressed and housed in the case 27, the case 27, the vibrator main part 26, and A weight 21 that constitutes the vibrator main part 26;
The foamed elastic body layer 23 and the solid elastic body layer 25 are in a state in which compression pressure is applied to each other, that is, the members are always in close contact with each other, and even when an external impact is applied to the case 27. There is no deviation in the shearing direction between the vibrator main part 26 and between the respective members of the vibrator main part 26, and it is possible to prevent extra movement of the vibrator.

However, when the vibrator main part 26 is compressed and housed, the elastic foam layer 2 that inevitably covers the weight 21.
Since the density of 3 and the solid elastic layer 25 becomes high, the movement of the weight 21 as a vibrator is significantly suppressed, and the movement as a vibrator matching the natural frequency of the target racket frame. Is difficult to obtain, and it is predicted that the shock vibration generated in the racket frame cannot be sufficiently absorbed and relaxed. Therefore, it is necessary to adjust the compression state so as not to suppress the movement of the weight 21, but if the compression pressure is relieved, the above-mentioned members will be displaced and an unnecessary movement will occur when an external impact is applied. On the contrary, there is a possibility that the function (vibration) as a vibrator may be deteriorated.

Further, the vibration absorbing member is mounted together with the case 27 in a cavity provided at the grip end of the racket frame. However, since the case 27 is hard and lacks flexibility, the vibration absorbing member is absorbed. Strict dimensional accuracy corresponding to the shape of the case 27 is required for the cavity that receives the member. In addition, since the case 27 lacking in flexibility is hard to follow the deformation of the racket frame itself, strain stress is likely to occur at the adhesive interface between the case 27 and the inner wall surface of the cavity. ,
There is a risk that the case 27 may be separated from the inner wall surface of the cavity by continuous use, and collision and separation from the inner wall surface may be repeated, resulting in an offensive collision sound (noise).

In view of such conventional problems, the present invention can sufficiently obtain the desired function (vibration) as a vibrator in accordance with the natural frequency of the hitting tool, and reduce the impact vibration generated at the time of hitting. An object of the present invention is to provide a vibration absorbing member which can absorb and relax rapidly and can maintain stable absorbing ability for a long period of time.

[0011]

In order to achieve the above object, a vibration absorbing member according to claim 1 of the present invention has at least two different elastic deformation regions around a mass body which is a vibrator.
In the vibration absorbing member obtained by coating and laminating the elastic body layer, an adhesive layer is interposed between the mass body and the elastic body layer and / or between the laminated layers of the elastic body layer. To do.

A second aspect of the present invention is the vibration absorbing member according to the first aspect, wherein the elastic body layer includes an inner foam elastic body layer coated around the mass body, and the inner foam elastic body. It is characterized in that it comprises an outer elastic layer which is covered and laminated around the layer and has an elastic deformation region smaller than that of the inner foam elastic layer.

A third aspect of the present invention is the vibration absorbing member according to the first or second aspect, wherein a resin sheet having excellent slidability is attached to both ends of the mass body in the longitudinal direction. It is what

A fourth aspect of the present invention is the vibration absorbing member according to the second aspect, wherein the inner foam elastic layer has a repulsive force at 25% compression within a range of 13 Pa to 48 Pa. It is a thing.

A fifth aspect of the present invention is the vibration absorbing member according to the second aspect, wherein the outer elastic layer has a repulsive force within a range of 48 Pa to 159 Pa at 25% compression. Is.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to preferred embodiments described in detail with reference to the drawings. FIG. 1 shows an external view of the vibration absorbing member 1 of the present embodiment, and FIG. 2 shows its configuration explanatory view.

That is, the vibration absorbing member 1 of this embodiment is shown in FIG.
As shown in FIG. 2, it is composed of a cylindrical member main body 2 and a pair of side members 3 attached to the member main body 2. The member body 2 is composed of a rod-shaped mass body 4 that acts as a vibrator when an external impact is applied, and an elastic layer 5 that covers the circumference of the mass body 4. The elastic layer 5
Is an inner foam elastic body layer 6 that is directly coated on the periphery of the mass body 4, and is laminated around the inner foam elastic body layer 6 and has an elastic deformation region smaller than that of the inner foam elastic body layer 6. It is configured to have a two-layer structure composed of an outer elastic body layer 7 formed of a material, and between the laminated layers of the inner foam elastic body layer 6 and the outer elastic body layer 7,
It has a structure in which an adhesive layer 8 such as a double-sided tape is interposed. Further, the side member 3 is formed of a material having the same elasticity as that of the outer elastic layer 7 or a side elastic layer 9 formed of a material having an elastic deformation region substantially equal to the outer elastic layer 7, and a material excellent in slidability. A thin resin sheet 10 is provided, and the side elastic layers 9 are additionally provided at both longitudinal ends of the mass body 4 with the resin sheet 10 interposed therebetween.

In the vibration absorbing member 1 of the present embodiment, the circumference of the mass body 4 is covered with the inner foam elastic body layer 6, and the outer circumference thereof is smaller in elastic deformation region than the inner foam elastic body layer 6. Since it has a two-layer structure in which the mass layer 4 is covered and laminated with the body layer 7, the mass body 4 can exhibit relatively free movement in the inner foam elastic body layer 6, and the impact upon impact is generated. It is possible to excite good vibration as a vibrator that converts and absorbs vibration (vibration energy) into kinetic energy of the mass body 4. In addition, when a large impact is generated and the mass body 4 makes a large movement in the inner foam elastic body layer 6, the inner foam elastic body to be covered and laminated around the inner foam elastic body layer 6 is formed. The movement of the mass body 4 can be absorbed and relaxed by the outer elastic body layer 7 having a smaller elastic deformation range than the body layer 6, so that unpleasant noise or vibration that occurs when the mass body 4 collides with the impact tool body. Can be prevented.

Further, since the adhesive layer 8 is interposed between the inner elastic foam layer 6 and the outer elastic layer 7 forming a two-layer structure, even when an external impact is applied, There is no occurrence of extra movement such as displacement in the shearing direction between the inner foam elastic body layer 6 and the outer elastic body layer 7,
The desired function as a vibrator (excitation of vibration) can be surely exhibited. Further, according to such a configuration, even if the inner foam elastic layer 6 and the outer elastic layer 7 are not compressed by being housed in a case and the like, the compressive pressure is not applied to each other. Because a close contact is obtained,
By increasing the density of the inner foam elastic body layer 6 and the outer elastic body layer 7 by the compression pressure, the movement of the mass body 4 which is the best as the vibrator can be expressed without obstructing the free movement of the vibrator. .

In this embodiment, the side elastic layer 9 is added to both ends of the mass body 4 constituting the member main body 2 in the longitudinal direction via the resin sheet 10 formed of a material having excellent slidability. Since the structure is provided, the side elastic body 9 is prevented from being worn by the mass body 4 even during continuous use. Also, the resin sheet 1
Since 0 itself has excellent slidability, even when the mass body 4 comes into contact with the resin sheet 10, there is no frictional resistance that suppresses the movement of the mass body 4, and it is always good. It does not hinder the vibration of the mass body 4 as a simple oscillator.

Further, the vibration absorbing member 1 of the present embodiment, for example, as shown in FIG. 3, when it is mounted in the grip end 12 of the racket frame 11, the grip main body 1
The vibration absorbing member 1 according to the present embodiment is different from the case of using the conventional case in that the vibration absorbing member 1 is inserted into the cylindrical accommodating portion 14 provided inside the housing 3. Since the outer layer constituting itself is composed of the outer elastic body layer 7 constituting the member main body 2 and the side elastic body layer 9 and is configured to be elastically deformed to some extent, Even if there are variations in shape and the like, it is easy to fit the vibration absorbing member 1 into the accommodating portion 14, and the mounting work does not require labor. Further, since it is easy to follow the deformation of the racket frame 11 itself, strain stress does not occur at the adhesive interface between the vibration absorbing member 1 and the accommodating portion 14, and continuous use is possible. Even with the above, the vibration absorbing member 1 will not be separated from the accommodating portion 14.

As the material of the mass body 4 used in this embodiment, a material having a large specific gravity that can exhibit good movement as an oscillator is used. Specifically, it is desirable to be formed from a metal material having a specific gravity of 3 to 19, and particularly 6 to 13, such as iron, copper,
Lead, nickel, zinc, gold, platinum, silver, chromium, brass, tungsten, etc. are used. Above all, tungsten, copper, nickel and alloys thereof are preferable. If the specific gravity is less than 3, there is a problem that the dynamic vibration absorbing function is lowered and a satisfactory absorbing capacity cannot be obtained, and the specific gravity is 1
If it is larger than 9, there is a problem that the vibration absorbing member 1 itself becomes heavy and the operability of the impact tool for attaching the vibration absorbing member 1 is adversely affected.

Further, as the material forming the inner foam elastic body layer 6, the outer elastic body layer 7 and the side elastic body layer 9,
For example, natural resins such as natural rubber, polyvinyl chloride,
Polyurethane-based, polystyrene-based, ethylene vinyl acetate copolymerized, synthetic resins such as polyolefin-based, or synthetic rubbers such as styrene-ptadiene-based, chloroprene-based, butadiene-based, butyl-based, ethylene-propylene-based, acrylic-based, silicon A material having elasticity such as a system rubber is used. That is, the inner foam elastic body layer 6 is made of a foam elastic body formed of these materials,
It is desirable to use a material having a large elastic deformation range that does not restrain the movement of the mass body 4 acting as a vibrator. Specifically, the repulsive force at 25% compression is 13 Pa to 48 P.
It is more preferable that the value of a is in the range of 25 Pa to 45 Pa. If the repulsive force at the time of 25% compression is less than 13 Pa, the elastic force is insufficient and the retention of the mass body 4 is poor, and if it is greater than 48 Pa, the movement of the mass body 4 is restricted. However, good absorption tends to be difficult to obtain.

The outer elastic layer 7 and the side elastic layer 9 are made of a foam elastic material or a solid elastic material, and have a smaller elastic deformation range than the inner foam elastic layer 6. It is desirable to be composed of. Specifically, 25
% Repulsion force is 48Pa-159Pa, especially 6
It is more desirable that it is in the range of 5 Pa to 95 Pa.
When the repulsive force at the time of 25% compression is less than 48 Pa,
When a large impact is applied, the elastic force for absorbing and relaxing the collision of the mass body 4 is insufficient, so that the mass body 4 collides with the striking tool body, causing unpleasant noise and vibration. If it is higher than 159 Pa, the elasticity becomes too high, and the mass body 4 tends to cause noise and vibration due to the collision with the outer elastic body layer 7.

Further, the resin sheet 10 used in the present embodiment is made of a material which is less likely to be abraded even when the mass body 4 repeatedly collides with it, and has a low friction resistance on the surface and excellent in sliding property. As an example of a preferable material, a resin sheet formed of, for example, silicon, polyethylene, polyurethane, polyamide, or the like can be given. Among them, a resin sheet formed of silicon is particularly preferable.

In the vibration absorbing member 1 of this embodiment, the elastic body 5 constituting the member main body 2 has a structure in which the inner foam elastic layer 6 directly coated around the mass body 4 is used.
An example of a two-layer structure composed of the inner foam elastic body layer 6 and the outer elastic body layer 7 which is laminated around the inner foam elastic body layer 6 has been shown, but the present invention is not limited to this, and the elastic body 5 is not limited thereto. May have three or more layers.

In this embodiment, the adhesive layer 8 is interposed only between the laminated layers of the inner foam elastic body layer 6 and the outer elastic body layer 7. However, the adhesive layer 8 is
As shown in FIG. 4, it may be interposed between the mass body 4 and the inner foam elastic body layer 6. In this case, the adhesion between the mass body 4 and the inner foam elastic body layer 6 is increased, and it is possible to prevent unnecessary movement accompanied by a shearing direction deviation between the mass body 4 and the inner foam elastic body layer 6, The function (vibration) as the target vibrator can be further enhanced.

Further, the pressure-sensitive adhesive layer 8 used in this embodiment is not limited to a double-sided tape, and various pressure-sensitive adhesive materials or soft adhesives may be used.

[0029]

As described above, in the vibration absorbing member of the present invention, the desired function (vibration) as a vibrator suitable for the natural frequency of the impact tool can be obtained, and the impact vibration generated at the time of impact can be suppressed. Absorption and relaxation can be carried out rapidly, and stable absorption capacity can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is an external view of a vibration absorbing member according to this embodiment.

FIG. 2 is a structural explanatory view of a vibration absorbing member according to the present embodiment.

FIG. 3 is an explanatory view showing a state in which the vibration absorbing member according to the present embodiment is attached to the racket frame.

FIG. 4 is a structural explanatory view showing another embodiment.

FIG. 5 is an explanatory diagram of a conventional vibration absorbing member.

FIG. 6 is an explanatory view of a conventional vibration absorbing member.

FIG. 7 is an explanatory diagram of a conventional vibration absorbing member.

FIG. 8 is an explanatory view of a conventional vibration absorbing member.

[Explanation of symbols]

1 Vibration absorbing member 2 member body 3 side member 4 mass 5 elastic body 6 Inner foam elastic layer 7 Outer elastic layer 8 Adhesive layer 9 Side elastic layer 10 resin sheet 11 racket frame 12 Grip end 13 Grip body 14 Housing 21 Weight 22 Elastic body 23 Foamed elastic layer 24 Elastic layer 25 Solid elastic layer 26 Transducer main part 27 cases

Continued front page    F-term (reference) 4F100 AB01A AK52E AN01C AR00B                       AR00C AR00D AR00E AT00A                       BA04 BA05 BA07 BA10E                       BA13 BA26 DB01 DD31 DJ01C                       GB87 JH02 JK07C JK07E                       JK11 JL13B JL13D YY00C                       YY00E

Claims (5)

[Claims] 1. A vibration absorbing member formed by coating and laminating at least two elastic body layers having different elastic deformation regions around a mass body, which is a vibrator, between the mass body and the elastic body layer, and And / or a vibration absorbing member having an adhesive layer interposed between the laminated layers of the elastic layer. 2. The elastic layer is covered and laminated around an inner foam elastic layer around the mass body, and elastic around the inner foam elastic layer. The vibration absorbing member according to claim 1, comprising an outer elastic body layer having a small deformation region. 3. The vibration absorbing member according to claim 1, wherein a resin sheet having excellent slidability is additionally provided at both ends of the mass body in the longitudinal direction. 4. The vibration absorbing member according to claim 2, wherein the inner elastic foam layer has a repulsive force in the range of 13 Pa to 48 Pa at 25% compression. 5. The vibration absorbing member according to claim 2, wherein the outer elastic layer has a repulsive force in the range of 48 Pa to 159 Pa at 25% compression.