JPH0755239B2 - Exercise equipment for hitting balls - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball hitting exercise equipment such as a tennis racket, a baseball bat, or a golf club.

2. Description of the Related Art Conventional exercise equipment of this type has a hitting portion having a hitting surface for hitting a ball such as a tennis ball, and a grip handle portion for rotating the hitting portion. The part and the handle are integrally connected by a rigid skeleton body.

In the case of a tennis racket, the ball striking face is an annular frame portion on which the net is stretched, and in the case of a golf club, it is a face portion of the club head. On the other hand, in the case of a baseball bat, since the ball striking face is formed on the frame body surface, the entire upper half of the bat is the ball striking face.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In such a ball striking tool, since the ball striking portion and the grip handle portion are made continuous by a rigid skeleton body which is a frame, the impact force at the time of hitting the ball is directly generated. In many cases, it is transmitted to the palm of the hand and impacts the hands and arms.

When the ball does not hit the ball accurately at the core of the hitting part, the shock wave resonates over the entire frame and acts strongly on the palm, so that the beginner's wrist,
In addition to often causing sports problems on the elbows, shoulders, etc., the pleasant feel of a hit ball is not obtained, and in general, the impact force of a hit ball propagates through the frame and reaches the palm, so there is almost no attenuation, and this is the reason why There was a problem that even a person with a long training could cause sports problems.

Means for Solving the Problems In order to solve the above-mentioned problems, the first embodiment of the present invention, a ball-hitting exercise tool, has a part of a frame of a hard skeleton body in which a ball-hit part and a grip handle part are connected. At least two silicone gel layers having a silicone gel as a base are provided facing each other, and a mass body is arranged in the space between the silicone gel layers. It is fixed to the center of the carrying rod, and both ends of the hanging rod sneak into the silicone gel layer, so that both the mass body and the hanging rod are supported on the silicone gel layer without contacting the inner surface of the hollow part of the frame. It is supported by.

The second aspect of the present invention is a ball hitting exercise tool characterized in that the silicone gel has a penetration of 10 to 80 and a mechanical loss coefficient (tan δ) of 0.1 to 0.5 when excited at 1 Hz.

Action Since the ball hitting exercise equipment of the present invention has such a structure, the impact generated at the ball hitting portion only vibrates the mass body and the hanging rod, and the palm of a person who holds the ball at almost the tip of the handle. It is rarely transmitted to.

That is, the vibration generated by the impact of the hit ball is first transmitted to the mass body through the silicone gel layer and the suspension rod. On the other hand, the vibration is attenuated and absorbed by the silicone gel layer. . This is because the silicone gel layer supports the mass body and acts as an elastic body that transmits vibrations, and at the same time, it also acts as a viscous body that attenuates the vibrations that have been once transmitted, and this entire portion acts as a so-called dynamic vibration absorber. Because.

EXAMPLE FIG. 1 is a front view of a main part of a tennis racket 1 which is an example of an athletic device for hitting balls according to the present invention. The frame shown here is made by bending a rigid skeleton and has an upper portion. Has an annular portion for forming a ball striking face, and a rod-shaped portion integrally formed with the annular portion is connected to the annular portion.

In this embodiment, the frame is formed by bending one shaft member in an annular shape to form an annular portion which is a hitting portion 2, and the both ends of the annular portion are combined to form a bar-shaped portion which is a grip handle portion 3. The upper part of the part is bifurcated, and the lower part is formed as a gripping part 32 by overlapping both ends integrally, and in the embodiment, the gripping part 32 is laminated on the peripheral surface of the handle handle material 320. A base layer 321 of the foamable compatible resin thus formed, and an outer cover layer of artificial or natural leather band that covers the outer surface of the base layer.
322 and.

The above-mentioned frame is integrally made of a glass fiber reinforced plastic shaft material having a core material of expandable synthetic resin. To make a frame having such an integral structure, a core bent in advance into a frame shape is used. There is a method of winding a prepreg, which is a molding material of fiber reinforced plastic, around the material and heat-pressing it in a mold. Separately from this, the prepreg is wound on a rod-shaped core material to form one rod-shaped shaft. There is also a method in which after the material is obtained, the shaft material is bent and fitted into a mold to be heated and pressed. A horizontal frame piece 21 is erected as a part of an annular portion on the forked portion 31 of the grip handle 3, and the horizontal line piece 21 is provided with an intestinal line which serves as a ball striking surface and a thread end of a gut 22 made of nylon thread. Be locked. The horizontal frame piece 21 is a method of winding a prepreg together with the annular portion on a core material installed as the lower side of the annular portion so as to be simultaneously formed at the time of heat and pressure forming, and separately from this. There is a method of fixing a horizontal frame piece formed of synthetic resin or the like by screwing or adhering.

In such a frame, the inside of the frame is hollow about 5 cm from the end of the grip portion 32, and the vibration absorber 4 made of a silicone gel layer, a mass body, and the like described later is provided therein.

As shown in FIG. 2, the vibration absorber 4 includes an outer cylinder 41 and an outer cylinder thereof.
Two silicone gel layers 5 filled inside both ends of 41
5, and a mass body 6 and the like supported in a state of being bridged between the silicone gel layers 5 and 5. That is, in the embodiment, the outer cylinder 41 is made by cutting an aluminum cylinder having a diameter of 16 mm into about 5 cm. First, the silicone gel layer 5 is attached to one end (in the actual work, the outer cylinder is set up. ,under)
To 10 mm, with a diameter of 3 mm and a length of 5 cm
A mass body 6 having a diameter of 10 mm and a length of 15 mm, which is penetrated by the iron rod-shaped suspension rod 7 and is located in the center thereof, is simultaneously installed inside the outer cylinder 41. Then, next, by reversing this, the silicone gel layer 5 of about 10 mm is provided also on the opposite end, and both ends of the hanging rod 7 are embedded in the silicone gel layer 5, resulting in the mass 6 It is in a state of being erected and supported between the silicone gel layers 5 and 5. In the embodiment, the outer cylinder 41 is provided with a window (not shown) for injecting the undiluted solution of silicone gel, and the weight of the mass body 6 and the suspension rod 7 is about 12 g in total. The total weight including the gel layer 5 and the outer cylinder 41 is about 20 g.

Then, such a vibration absorber 4 is inserted into the hollow portion of the grip portion 32 and is adhesively fixed, and the cap 33 at the grip portion end is fitted thereon.

Here, the silicone gel used as the silicone gel layer is composed of a dimethylsiloxane component unit and is used in the following formula [I]: diorganopolysiloxane (component A): RR ¹ ₂ SiO- (R ² ₂ SiO) _n SiR ¹ ₂ R ... [I] [wherein R is an alkenyl group, R ¹ is a monovalent hydrocarbon group having no aliphatic unsaturated bond, and R ² is a monovalent aliphatic hydrocarbon group. (At least 50 mol% of R ² is a methyl group, and when it has an alkenyl group, its content is
10 mol% or less), and n is a number such that the viscosity of this component at 25 ° C. is 100 to 100,000 cSt].
And an organohydrogenpolysiloxane having a viscosity at 25 ° C. of 5000 cSt or less and having at least three hydrogen atoms directly bonded to Si atoms in one molecule (component B)
And a diorganopolysiloxane (component A) based on the total amount of hydrogen atoms directly bonded to Si atoms in the diorganohydrogenpolysiloxane (component B).
The ratio (molar ratio) of the total amount of alkenyl groups contained therein is 0.
It is an addition type silicone copolymer obtained by curing a mixture adjusted to 1 to 2.0.

To explain this silicone gel in more detail,
The above-mentioned component A, the diorganopolysiloxane, has a linear molecular structure and has alkenyl groups R at both ends of the molecule.
Is a compound capable of forming a crosslinked structure by adding with a hydrogen atom directly bonded to the Si atom in the B component. The alkenyl group present at the terminal of this molecule is preferably a lower alkenyl group, and a vinyl group is particularly preferable in view of reactivity.

Further, R ¹ present at the molecular end is a monovalent hydrocarbon group having no aliphatic unsaturated bond, and specific examples of such a group include a methyl group, a propyl group and a hexyl group. Such alkyl groups, phenyl groups and fluoroalkyl groups can be mentioned.

In the above formula [I], R ² is a monovalent aliphatic hydrocarbon group, and specific examples of such a group include an alkyl group such as a methyl group, a propyl group and a hexyl group, and a vinyl group. Lower alkenyl groups such as However, at least 50 mol% of R ² is a methyl group, when R ² is an alkenyl group is preferably an alkenyl group is the amount of 10 mol% or less. If the amount of alkenyl groups exceeds 10 mol%, the crosslink density becomes too high and the viscosity tends to be high. In addition, n is the A component
The viscosity at 25 ° C. is usually set in the range of 100 to 100,000 cSt, preferably 200 to 20,000 cSt.

The organohydrogenpolysiloxane which is the B component is a crosslinking agent for the A component, and the hydrogen atom directly bonded to the Si atom adds to the alkenyl group in the A component to cure the A component.

The component B may have the above-described action, and as the component B, those having various molecular structures such as linear, branched chain, cyclic, or network can be used. Also,
In addition to hydrogen atoms, an organic group is bonded to the Si atom in the component B, and this organic group is usually a lower alkyl group such as a methyl group. Furthermore, the viscosity of component B at 25 ° C. is usually 5000 cSt or less, preferably 500 cSt or less.

Examples of such component B include organohydrogensiloxane whose both ends are blocked with triorganosiloxane groups, copolymers of diorganosiloxane and organohydrogensiloxane, tetraorganotrihydrogencyclotetrasiloxane, HR ¹ ₂ SiO _1/2 copolymerized siloxane composed of SiO _4/2 units and HR
^An example is a copolymerized siloxane composed of ¹ ₂ SiO _1/2 units, R ¹ ₃ SiO _1/2 units and SiO _4/2 units. However, in the above formula, R ¹ has the same meaning as described above.

The ratio of the total molar amount of alkenyl groups in the component A to the total molar amount of hydrogen atoms directly bonded to Si in the component B is usually 0.1 to 2.0, preferably 0.1 to 1.0.
It is manufactured by mixing the component A and the component B so as to be within the range of and curing. The curing reaction in this case is
Usually, it is carried out using a catalyst. The catalyst used here is preferably a platinum-based catalyst, and examples of such a platinum-based catalyst include finely pulverized elemental platinum, chloroplatinic acid, platinum oxide, a complex salt of platinum and an olefin, and platinum alcoholate. And complex salts of chloroplatinic acid and vinyl siloxane. Such a catalyst is usually 0.1 ppm (platinum equivalent, the same applies below) to the total weight of the A component and the B component.
Or more, preferably 0.5 ppm or more. The upper limit of the amount of such a catalyst is not particularly limited, but for example, when the catalyst is in a liquid state or can be used as a solution, an amount of 200 ppm or less is sufficient.

The component A, the component B and the catalyst as described above are mixed and allowed to stand at room temperature or to be cured by heating to produce the silicone gel used in the present invention. When heating and curing, the heating temperature is usually 50 to 160 ° C.

The silicone gel thus obtained has JIS K (K
Penetration measured with −2207-1980 50g load) is usually 5 to 2
A material having a hardness of 50 degrees, but preferably in a range of 10 to 80 degrees is used.

The hardness of such a silicone gel can be adjusted by using the amount of the component A in excess of the amount capable of forming a crosslinked structure with the hydrogen atom directly bonded to Si in the component B. it can. As another method, it can be adjusted by previously adding a silicone oil having methyl groups at both ends in an amount within a range of 5 to 75% by weight with respect to the obtained silicone gel.

The silicone gel having such characteristics can be prepared as described above, or a commercially available one can be used. Examples of commercial products that can be used in the present invention include TOUGH-3, TOUGH-4, TOUGH.
-5 (manufactured by Torre Silicone Co., Ltd.) and X32-902 / cat1300
(Shin-Etsu Chemical Co., Ltd.) can be mentioned.

In addition to the above-mentioned A component, B component and catalyst, a pigment,
A curing retarder, a flame retardant, a filler, etc. can be added within a range that does not impair the properties of the silicone gel, and a composite silicone gel containing fine hollow spheres may be used. Materials such as Philite (registered trademark) manufactured by Nippon Philite Co., Ltd. and Expancel (registered trademark) sold by the same company
Etc. can be illustrated.

In the examples, the above-mentioned X32-902 / cat1300 was used to form a silicone gel layer having a penetration loss of about 50 and a mechanical loss coefficient (tan δ) of 0.2 to 0.3 when excited at 1 Hz.

Therefore, when a tennis ball is hit using the tennis racket 1 in which such a vibration absorber 4 is mounted in the grip portion 32, the shock wave at the time of hitting the hitting surface from the hitting portion 2 of the frame, which is a rigid skeleton, is generated. The shock waves are sequentially transmitted to the grip handle portion 3, and in the grip portion 32, the shock wave is transmitted from the outer cylinder 41, which is a part of the hollow portion of the frame, through the silicone gel layer 5, and further, the suspension rod 7 and the mass. The mass body 6 is transmitted to the body 6 and vibrates integrally with the suspension rod 7. In particular, when the weight of the mass body 6 and the viscoelastic properties of the silicone gel are matched, resonance occurs and the vibration of the frame can theoretically be zero. At the same time, the vibration of the mass body 6 and the suspension rod 7 causes the tip of the suspension rod 7 to deform the silicone gel layer 5 such that the silicone gel layer 5 is twisted, so that the vibration energy is consumed as heat energy. Vibrations damp rapidly.

In other words, the silicone gel layer 5 supports the mass body 6 and the suspension rod 7 and acts as an elastic mass that transmits vibration, and at the same time,
This is because it also functions as a viscous body for damping the vibrations of the mass body 6 and the suspension rod 7, and the entire structure of this portion functions as a so-called dynamic vibration absorber. As a result, the vibration of the frame is minimized and the mass body 6 The vibrations propagated to are almost absorbed so that they are not returned to the frame again.

Further, even when the impact at the time of hitting the ball is particularly strong, since the mass body 6 is supported at both ends, there is no possibility of inducing strange vibration or hitting the inner surface of the frame in this way.
It is also durable for long-term use. Further, the vibration of the mass body 6 causes the silicone gel layer 5 to be deformed at both ends of the hanging rods 7 on both sides thereof, so that energy consumption can be performed at double speed.

Here, in the example, a silicone gel having a penetration loss of about 50 and a mechanical loss coefficient (tan δ) of 0.2 to 0.3 when excited at 1 Hz was used for the silicone gel layer. The weight that can be added to a hit ball exercise equipment is at most 10
This is because it is g-stopped, and in such a case, it was most effective to use a silicone gel having such viscoelastic properties. By the way, in consideration of the impact force at the time of hitting a golf club or a baseball bat, and the like, generally, in a hitting exercise equipment, as a silicone gel used in the use as in the present invention, the needle penetration is 10 to 80. However, it is preferable to use one having a mechanical loss coefficient (tan δ) of 0.1 to 0.5 when excited at 1 Hz.

Further, the one shown in FIG. 3 is configured such that the vibration absorber 4 is easy to produce, the outer cylinder is divided into three, the upper and lower divided cylinders 42 are symmetrical, and the central cylinder 43 is combined. For example, as shown by the chain double-dashed line in the same figure, if the silicone gel layer 5 is formed on the ends thereof in advance and the two are connected so as to match each other, it is turned over like the structure of FIG. It is possible to omit a complicated process such as injecting a stock solution of gel. Reference numeral 57 is a hole which is opened at the same time when the silicone gel layer is formed in order to receive the hanging rod 7.

Further, what is shown in FIG. 4 is one in which the fixing of the suspension rod 7 to the silicone gel layer is strengthened, and after the suspension rod 7 and the mass body 6 are arranged in the outer cylinder 41, the silicone is provided at one end. After forming the gel layer 5, the other end is fitted with a cylinder 44 having an outer diameter fitted to the outer cylinder and having a silicone gel layer 51 formed thereon. In this case, the lifting rod has collars 71 and 72 on both sides, and one of the collars 71 is buried in the silicone gel layer 5,
The other 72 is pressed against the silicone gel layer 51 later.

In addition, as a vibration absorber, prepare a number of different combinations of silicone gel with different characteristics, weight of the mass, length of the hanging rod, etc. so that you can select and set the one with a good feel at the time of hitting. You may For this, it is preferable that the cap 33 of the grip portion can be easily removed.

Although the tennis racket has been described above as an example, the ball hitting exercise equipment of the present invention is not limited to this, and it is needless to say that it can be applied to a baseball bat, a golf club, and other ball hitting exercise equipment.

Further, in the above embodiment, as the frame hard skeleton material,
Although described as being made of glass fiber reinforced plastic, the present invention is not limited to this, carbon fiber reinforced may be used, other than single wood, laminated wood, these are fiber reinforced plastic. Although it is reinforced, aluminum, other alloys, etc. are drawn out, other metal moldings, thermoplastics, injection molding, transfer molding, compression molding of thermosetting resins, combinations of these, etc. Needless to say, it can be applied, and the location where the silicone gel layer, the mass body and the suspension rod are attached is not limited to the grip portion of the above embodiment, and may be a forked portion or other portion. It may be configured according to the form of the ball hitting exercise tool.

EFFECTS OF THE INVENTION As described above, according to the ball hitting exercise tool of the present invention, the portion provided with the silicone gel layer, the mass body, and the suspension rod acts as a so-called dynamic vibration absorber while having an extremely simple structure, Since the shock vibration of can be replaced with the vibration of the mass body, it is rarely transmitted to the palm of the person at the gripping part, it will converge in a short time, and a comfortable shot feeling can be obtained, It becomes possible to solve the problem of sports disorders.

[Brief description of drawings]

FIG. 1 is a front view showing almost the entire tennis racket as an embodiment of an exercise tool for hitting balls according to the present invention, FIG. 2 is a cross-sectional view of a main portion thereof, and FIG. 3 is an outer cylinder of a vibration absorber and silicone. Sectional drawing in other Example which shows a gel layer, FIG. 4 is sectional drawing in other Example of a vibration absorber. 2 ... Hitting part, 3 ... Grip handle part, 32 ... Gripping part 4 ... Vibration absorber, 5.51 ... Silicone gel layer 6 ... Mass body, 7 ... Suspension rod

Claims (2)

[Claims] 1. A hollow portion is provided in a part of a frame of a hard skeleton body connecting a hitting portion and a grip handle portion, and at least a silicone gel layer having a silicone gel as a base is opposed to the hollow portion. A mass body is arranged in the space between the silicone gel layers, and the mass body is fixed to approximately the center of the suspension rod, and both ends of the suspension rod infiltrate into the silicone gel layer. An athletic device for hitting balls, wherein the mass body and the suspension rod are supported by the silicone gel layer on both sides without contacting the inner surface of the hollow portion of the frame. 2. A ball hitting exercise tool characterized in that the silicone gel has a penetration of 10 to 80 and a mechanical loss coefficient (tan δ) of 0.1 to 0.5 when excited at 1 Hz.