JPH062172B2 - Exercise equipment for hitting balls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a ball hitting exercise equipment such as a tennis racket, a golf club, and a baseball bat.

<Prior Art> A conventional exercise equipment of this type has a hitting portion formed with a hitting surface for hitting a ball such as a tennis ball, and a gripping portion for rotating the hitting portion, The gripping portion and the hitting portion are integrally connected by a rod-shaped hard skeleton portion.

In the case of a tennis racket, the hitting portion is composed of a frame stretched with a net as a hitting surface, and a shaft having a grip as a gripping portion is integrally connected to the frame as a hard skeleton portion. There is.

On the other hand, the hitting portion is a club head in the case of a golf club, and a shaft as a hard skeleton is integrally connected and a grip as a gripping portion is provided above the shaft.

Also, in the case of a baseball bat, the hitting portion is the entire upper half of the bat because the hitting surface is formed on the upper body surface, and the hard skeleton corresponds to the lower half of the bat. Is provided with a grip.

<Problems to be Solved by the Invention> In such a ball striking exercise device, since the ball striking portion and the gripping portion are made continuous by the hard skeleton portion, the impact force at the time of hitting the ball on the ball striking surface is direct. It is transmitted to the palms of the hands and shocks the hands and arms.

This impact force causes shock waves to resonate strongly on the palm of the hand when the ball hits the core of the ball and does not hit the ball. In addition to many things, in general, the impact force due to hitting ball propagates through the hard skeleton and reaches the palm, so it is hardly attenuated, so even a skilled person often causes sports injury by long-time practice. There was a problem to say.

<Means for Solving the Problems> In the present invention, the grip portion 30 provided on the hard skeleton portion 20 of the above-mentioned ball striking device is provided with a foamable synthetic resin, preferably low foaming, on the peripheral surface of the hard skeleton portion 20. Base layer 31 formed by laminating a synthetic resin, an outer cover layer 33 made of, for example, leather covering the outer surface of the base layer 31, and directly contacting the hard skeleton portion 20 or 1 of the base layer 31. Through the above-mentioned hard skeleton 2
0, either indirectly contacting it or by interposing it between the jacket layer 33 and the base layer 31 so as to be integrated with the base layer 31 and arranged along the longitudinal direction of the hard skeleton. It is characterized in that it has a buffer layer 32 of a gel material.

<Operation> Since the hitting ball exerciser of the present invention has such a structure, the cushioning force generated in the hitting portion at the time of hitting is propagated through the hard skeleton portion 20 and transmitted from the grip portion 30 to the palm of the human body.

Since the grip portion 30 has the base layer 31 made of a foamable synthetic resin as described above and the buffer layer 32 of a gel-like substance combined with the base layer, the grip portion 30 is touched from the hard skeleton portion 20 to the palm. The shock wave heading for passes through the buffer layer 32 and the base layer 31.

The shock action of the shock wave in the buffer layer 32 is performed by the inelastic or microelastic deformation characteristic of the gel-like substance and the liquid-like diffusion characteristic.

That is, when a buffer wave is applied to a gel-like substance, it is deformed by this impact force and absorbs and attenuates impact energy by intermolecular frictional resistance due to the deformation. The impact resilience due to strain is extremely small enough to be ignored, or is so small that it does not adversely affect the impact operation.Therefore, it is possible to prevent the generation of new shock waves due to the impact resilience, and the gel-like material can Since the shock wave has a characteristic of being promptly dispersed and transmitted by a propagation characteristic similar to that of the liquid, the shock wave is subdivided and propagated in the surrounding base layer 31.

Therefore, in the athletic device for hitting balls of the present invention, the hard skeleton portion 20
The shock waves radiated from the shock absorber are effectively absorbed and attenuated in the grip portion 30.

<Embodiment> FIG. 1 is a partially cutaway front view of a tennis racket which is an embodiment of an exercise tool for hitting balls according to the present invention. The hitting portion is an annular frame 10.
In addition to this, a thread 111 such as intestine or nylon is stretched in a net shape on the frame 10 to form a ball striking surface 11.

The base portion of the frame 10 is formed as a rod-shaped rigid skeleton portion integrally formed with the frame 10, and in the embodiment, it is shown by a long stem portion 20 which is bifurcated.

The base end of the long handle portion 20, that is, the lower portion in the figure is configured as a grip portion 30, and the grip portion 30 has a foaming property formed in multiple layers on the peripheral surface of the long handle portion 20 as shown in FIG. A base layer 31 of synthetic resin, a buffer layer 32 of a gel-like substance which is embedded in the base layer 31 so as to be isolated from the long handle portion 20, and an outer coat layer 33 which covers the outer surface of the base layer 31. It is configured.

The frame 10 and the long handle portion 20 are integrally formed by using a hollow shaft material having a drum-shaped cross section.
In order to form the lower edge of the ball striking face 11 of 0, a horizontal frame piece 12 is provided near the boundary between the long handle portion 20 and the frame 10, and the yarn end is fixed to the horizontal frame piece 12.

The grip portion 30 is provided 10 cm or more at the base of the long handle portion 20, and an artificial or natural leather band as the outer cover layer 33 is wrapped around the grip portion 30.

In the exercise equipment of the present invention, the grip portion 30 has a foamable synthetic resin,
Desirably, a buffer layer 32 of a gel-like substance is provided so as to be covered with a base layer 31 of a low-foaming synthetic resin. As the gel-like substance of the buffer layer 32, silicone gel is a stable material. It is well suited from the viewpoint of sex, and among them, JI
Silicone gel having a penetration of about 50 to 200 measured by SK2530-1976- (load of 50 g),
The composite silicone gel obtained by mixing such a silicone gel as a base material with micro hollow spheres therein is most preferable.

Since such silicone gel materials are also particularly excellent in buffering and anti-vibration ability, the intended purpose can be easily achieved by using these silicone gel materials.

As such a material, for example, trade name Toray Silicone CF502 manufactured by Toray Silicone Co., Ltd.
7 and product name KE-1051 manufactured by Shin-Etsu Chemical Co., Ltd.
In addition, as the hollow microspheres mixed in the silicone gel material, there are Philite (registered trademark) manufactured by Nippon Philite Co., Ltd. and Expancel (registered trademark) sold by the same company. The silicone gel is disclosed in Japanese Patent Application No. 60-297677.

As shown in FIG. 2, the buffer layer 32 is arranged on the four surfaces of the two parallel shafts 21 and 22 that form the elongated handle portion 20 along the longitudinal direction of the elongated handle portion 20, respectively. Each buffer layer 32 is formed into a flat and slender plate piece, and is immersed in the base layer 31.

The base layer 31 is formed into a shape having an octagonal cross section, and includes the buffer layer 32 so as to be slightly separated from the long handle portion 20. Therefore, the shock wave from the long handle portion 20 has an inner portion of the base layer 31. It is designed to pass through and reach the buffer layer 32.

In the above embodiment, the buffer layer 32 is separated from the long stalk portion 20 by the base layer 31, which allows the base layer 31 to be separated.
It is designed so that the adhesion between the long handle portion 20 and the long handle portion 20 is improved. However, in the exercise equipment of the present invention, as shown in FIG. 3, the buffer layer 32 is directly attached to the hard skeleton portion shown by the long handle portion 20. It may be in close contact, or as shown in FIG.
The buffer layer 32 may be interposed between the and the coating layer 33.

Therefore, in the embodiment shown in FIG. 4, it is desirable that the covering layer 33 is pressed outward by the buffer layer 32.

For this purpose, it is preferable to form a recess in the base layer 31 and fit the buffer layer 32 into the recess.

It is desirable that the hard skeleton portion 20 and the frame 10 themselves be configured to absorb the buffer wave. For this,
Long handle portion 20 in the embodiment shown in FIGS. 3 and 4 above.
Has a core portion 23 made of a highly foamable synthetic resin inside, and the long handle portion 20 is made of fiber reinforced plastic or the like. Such a long stalk portion 20, that is, a hard skeleton portion, is obtained by winding a core portion 23 of expandable synthetic resin such as polyurethane with a prepreg made of fiber reinforced plastic, fitting this into a mold, and then heating and pressurizing and curing. You can get it by doing.

In such a manufacturing process, when the gel-hardened gel-like substance is used in the buffer layer 32 in the form of a solid, when the gel-like substance is a silicone gel, the oil component is exuded from the inside, and in relation to the long handle portion 20. Since the fixed effect of may be lost,
From a practical point of view, as shown in FIG. 4, it is desirable to enclose the gel substance in a covering material 321 such as a urethane film having a thickness of 0.1 mm or a vinyl chloride film having a thickness of 0.3 mm before use.

In any case, the grip portion 30 is preferably formed by a reaction injection molding means in which the end portion of the long handle portion 20 and the gel-like substance are pre-inserted in a mold and a foamable synthetic resin is injected into the mold. Is.

That is, for example, the case of using polyurethane as the foaming synthetic resin will be described. In this case, a curing catalyst, a foaming agent, a foam stabilizer, and other additive components are added to the main components of the diisocyanate and the polyol to form a liquid molding material. At the same time, the liquid molding material is injected into a mold in which a gripping portion forming portion of the long handle portion 20 and a plate-like piece of a gel-like substance forming the buffer layer 32 are set in advance, and this is poured into a metal mold. The buffer layer 32 can be firmly held in the grip portion 30 by the internal pressure generated by the foaming of the base layer 31.

Thus, in this forming means, it is desirable to prevent the base layer 31 from falling off by crushing a part of the long handle portion 20 which is a skeleton portion.

Further, in the present embodiment shown in FIG. 1, the gel-like substance is not covered with a film or the like, and the above-mentioned silicone gel CF5
3% by weight of Expancel is added to 027 and it is used in a gel-hardened state. The four buffer layers 32 have a thickness of 1 mm and are a so-called chewing gum plate of 15 mm x 110 mm. Is made using.

Although four pieces of the buffer layer 32 are prepared in the embodiment, the buffer layer 32 does not necessarily have to be four pieces, and may be, for example, two pieces, six pieces, or eight pieces. By providing the buffer layer 32 in a divided state,
Keep the displacement deformation of the buffer layer 32 due to the twisting force within a certain range,
Still, it is possible to make the grip comfortable.

This is also advantageous in strengthening the bond between the hard skeleton portion shown by the long handle portion 20 and the base layer 31 of the grip portion and preventing the grip portion 30 from falling off.

Further, the kind and amount of the micro hollow particles mixed in the gel substance may be arbitrarily selected. For example, when the above-mentioned phyllite is used, it is mixed in about 35% by weight.

With the ball-hitting exerciser of the present invention, when a ball is hit by this, the impact at the time of hitting the ball at the hitting portion is transmitted to the palm as impact vibration.

Since this shock vibration always passes through the grip portion 30 immediately before being transmitted to the palm, the palm receives the vibration transmitted to the buffer layer 32 of the gel-like substance as a shock wave.

Here, the deformation of the gel-like material forming the buffer layer 32 is an inelastic deformation, does not cause repulsive elasticity, and propagates rapidly over a wide area, so that the vibration is attenuated and absorbed throughout the gel-like material. , It is much lower than that of the conventional one, and it will converge in a short time.

As a result of comparison between the tennis racket of the above-mentioned embodiment and the conventional tennis racket, the impact force transmitted to the palm and the vibration convergence time were significantly improved. In particular, the convergence time was 30% to 30%. A reduction of about 50% was recognized.

It should be noted that the inelastic deformation referred to in the present specification means that strong elastic deformation such as rubber and spring is not performed, and does not mean that elastic deformation is not performed at all.

Similarly, the absence of impact resilience means that strong impact resilience such as rubber and spring is not exhibited, and does not mean that the impact resilience is absolutely zero.

In addition, as a side effect, when the silicone gel is used as the gel material of the buffer layer 32, the specific gravity of the silicone gel is 0.6 to 1, and the foamable frame conventionally used for a tennis racket. Since it is relatively heavier than the components, the center of gravity can be brought closer to the grip portion 30 side.

In the above explanation, the tennis racket was described as an example,
The exercise equipment for hitting a ball according to the present invention is not limited to this, and can be applied to various exercise equipment such as golf clubs, baseball metal bats, and badminton rackets.

Further, as the gel-like substance forming the buffer layer 32,
In addition to the solid gel-hardened state described in the above Examples, as disclosed in JP-A-61-51035 and JP-A-62-13839, after gel hardening, A skin layer having a non-adhesive surface layer formed by increasing the degree of crosslinking on the surface, and JP-A-61-21
As disclosed in Japanese Patent Publication No. 436, No. 436, it is enclosed in an outer casing such as a urethane film, or is filled in a hose-shaped film, and as disclosed in Japanese Utility Model Publication No. 61-89534, each ball It is possible to use a cured product in the form of a sheet, and it is possible to arbitrarily select and use a regenerated gel produced by the production method disclosed in JP-A-62-132849, a molded product thereof, or the like.

Further, as the hard skeleton portion such as the long handle portion 20 connected to the hitting portion and used as the core of the grip portion 30, the following ones can be used in addition to the stainless steel shaft of the above embodiment.

That is, single wood, laminated wood, sandwich structure in which a reinforcing layer such as glass fiber is laminated on both sides of these, aluminum, other alloys, etc., cut, carved, punched, drawn, or other appropriate forming process Obtained by, or wood, laminated wood, polystyrene, having a core of expandable synthetic resin such as polyurethane resin, wound and covered with fiber reinforced plastic such as glass fiber or metal such as aluminum, bent, Most structures that have been used conventionally, such as those obtained by heat and pressure curing treatment, and those obtained by injection molding, transfer molding, compression molding of thermoplastic or thermosetting resin, are used. I can do things.

Further, as the foamable synthetic resin constituting the base layer 31, the polyurethane described in this example is considered to be the most suitable, but it is not limited to this, and epoxy resin, unsaturated polyester resin, polyamide, polystyrene , AB
Most synthetic resins that can be used for cast molding, such as S and polypropylene, can be used, and these can be selected from suitability such as strength and durability as a material of the grip portion 30.

<Effects of the Invention> As described above, in the ball hitting exercise equipment of the present invention, the buffer layer 32 of the gel-like substance and the base layer 31 of the foamable synthetic resin are provided in the grip portion.
Since it is installed in the form of being united with, the impact at the time of hitting is dispersed and absorbed by the buffer layer 32 and the base layer 31, and it is possible to largely eliminate the hitting ball vibration that adversely affects the palm. is there.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a tennis racket as an embodiment of an athletic device for hitting balls according to the present invention, and FIG. 2 is FIG. 1 II-II.
3 and 4 are cross-sectional views showing another embodiment of the grip portion used in the exercise equipment of the present invention. In the drawing, 10 is a hitting portion, 11 is a hitting surface, 20 is a long stem portion as a hard skeleton portion, 30 is a gripping portion, 31 is a base layer, 32 is a buffer layer, and 33 is an outer coating layer.

Claims (1)

[Claims] 1. A ball striking portion having a ball striking surface for striking a sphere, a rod-shaped hard skeleton portion continuous with the ball striking portion, and a grip portion provided on the hard skeleton portion. The holding part is a base layer formed by coating a foamable synthetic resin on the outer periphery of the hard skeleton in multiple layers, an outer coat layer covering the outer surface of the base layer, and the above between the hard skeleton part and the outer coat layer. An athletic device for hitting a ball, comprising a buffer layer of a gel-like material provided so as to be united with a base layer.