JPH01249078A - Sport goods for striking ball - Google Patents

Abstract

PURPOSE:To obtain the comfortable ball strike feeling and prevent the generation of sport disease by supporting a mass body onto an elastic chord laid between the opposed walls in noncontact with each side wall in a hollow part formed at a part of the frame of a hard skelton body which is constituted from a ball strike part and a grip part and forming the part between the mass body and the side wall of the hollow part with a gel layer containing the silicon gel having a specific value of the needle penetration degree as basic material. CONSTITUTION:A mass body 5 is arranged, separating from each side wall which constitutes a hollow part 4, in other words, the inside walls of a bifurcated part 31 and a lateral frame piece 21, and an elastic chord 6 is laid between the root of the bifurcated part 31 and the lateral frame piece 21 so as to longitudinally traverse the bifurcated part 31 of the frame, and the mass body 5 is supported in the middle of the elastic chord 6. In the state where the mass body 5 is fixed at a prescribed position in the vertical direction on the elastic chord 6, a gel layer 7 containing silicone gel as basic material is arranged on the periphery of the mass body 5. As the silicone gel in the gel layer, the silicone gel having the needle penetration degree of 50-200 or the complex silicon gel which is formed by mixing micro hollow spherical bodies into the silicone gel is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to ball-hitting exercise equipment such as tennis rackets, baseball bats, and golf clubs.

BACKGROUND OF THE INVENTION Conventional exercise equipment of this kind has a ball-hitting part on which a ball-hitting surface is formed, and a grip part for rotating the ball-hitting part, in order to hit a spherical object such as a tennis ball. The grip part and handle part are a hard skeleton and are integrally continuous.

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

Problems to be Solved by the Invention In such a ball hitting exercise device, since the ball hitting part and the grip part are connected to each other by a hard skeleton that is a frame, the impact force generated on the ball hitting surface when hitting the ball is directly transmitted. The shock is often transmitted to the palm of the hand, causing a shock to the hand and arm.

If the impact force does not accurately hit the ball with the core of the ball hitting part, the shock waves will resonate and act strongly on the palm of the hand, which can cause sports injuries to the wrists, elbows, shoulders, etc. of beginners. In addition to the fact that there are many
In addition, the impact force from a batted ball generally propagates through the frame and reaches the palm of the hand, so there is almost no attenuation.
There is a problem in that even experienced athletes may develop sports injuries due to long hours of practice.

In addition, the grip position of these ball-hitting tools differs depending on the person, as well as the length of the arm, grip strength, and arm strength. Since there are a wide variety of things, the way people feel about things also changes depending on the person, time, and thing.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a ball-striking exercise device configured as follows.

That is, within a hollow part formed in a part of the frame of a hard skeleton body in which a ball-hitting part and a grip part are connected, a mass body is moved between opposing walls of the hollow part without contacting each side wall that constitutes the hollow part. At the same time, a gel layer made of silicone gel with a penetration degree of about 50 to 200 is interposed between the mass body and the side wall of the hollow part, and the elastic string is The tension is adjustable, or the mass body is supported by an elastic string cantilevered from one side wall of the hollow part, and
The elastic string is characterized in that its cantilever length is adjustable.

Function: Since the ball hitting exercise device of the present invention is as described above, the impact force generated at the ball hitting portion only vibrates the mass body disposed inside the hollow portion, and the person who grips the ball at almost the tip of the grip handle. The amount of light that is transmitted to the palm of the hand is extremely small.

That is, since the mass body is supported in the hollow part of the frame via the elastic string, vibrations generated by the impact caused by the hit ball are quickly transmitted to the mass body.

The gel layer interposed between the mass body and the side wall of the hollow portion has low rebound resilience and damps and absorbs vibrations of the mass body.

This is because if the spring constant of the elastic string supporting the 1L mass body, the damping force due to the gel layer, etc. match the weight and natural frequency of the frame, the hollow part of the frame where the mass body is placed is This is because the structure acts as a so-called dynamic vibration absorber, but it also responds to changes in various conditions such as gripping position, arm length, grip strength, arm strength, tension, duration of use, and even temperature and humidity on that day. This is because the spring constant of the elastic string supporting the mass body can be subtly changed by adjusting its tension and cantilever length, so that a matched state can always be maintained.

Embodiment FIG. 1 is a front view of the main parts of a tennis racket l, which is an embodiment of the ball-hitting exercise equipment of the present invention. The ball has an annular portion for forming a ball-hitting surface, and a rod-shaped portion integrally formed with the core portion is connected to the annular portion.

In this embodiment, the frame is made by bending a single shaft material into an annular shape to create an annular part that spans the ball-striking part, and by bringing together both ends of this annular part to create a rod-shaped part that is the handle part 3. The upper part of the part has a bifurcated shape, and the lower part has both ends overlapped to form a grip part 32. In the embodiment, this grip part 32 is made of a multilayered grip part 32 on the circumferential surface of the handle part base. It consists of a foamable synthetic resin base layer and an artificial or natural skin covering layer covering the outer surface of this base layer.

The above frame is integrally made of a shaft material made of glass fiber reinforced plastic with a core material made of foamable synthetic resin. There is a method of wrapping prepreg, which is a fiber-reinforced plastic molding material, around the material and molding it under heat and pressure in a mold.Another method is to wrap prepreg around a rod-shaped core material to form a single rod-shaped shaft. After obtaining the shaft material, there is also a method of bending the shaft material and fitting it into a mold to form the shaft material under heat and pressure. A horizontal frame piece 21 is installed on the bifurcated part 31 of this grip handle part 3 as a part of the annular part, and this horizontal frame piece 21 has an II
The thread end of the string 22 made of wire or nylon thread is locked. Note that this horizontal frame piece 21 can be formed by winding the prepreg together with the annular part around a core material constructed as the lower side of the annular part so that it is formed at the same time as the heat-pressing molding, and separately. There is a method of fixing horizontal frame pieces made of synthetic resin or the like using screws, adhesives, etc.

In the embodiment, a portion surrounded by the horizontal frame piece 21 and the bifurcated portion 31 of the handle portion is used as the hollow portion 4 of the frame, and the mass body 5 is disposed in this space.

Therefore, the mass body 5 is placed separately from the side walls of the hollow portion 4, that is, the bifurcated portion 31 and the inner wall of the horizontal frame piece 21. The elastic value 6 is stretched between the horizontal frame pieces 21 from the base of the bifurcated portion 31 so as to be vertically traversed, and the mass body 5 is supported in the middle of the elastic value 6.

In the example, piano wire is used as the elasticity value 6,
They are connected in the middle with a turnbuckle 81 so that the tension can be adjusted. Both ends of the piano wire may be directly latched to the frame, but in this example,
It is attached using hook-shaped locking pieces 82 and 83. Further, the piano wire 6 is divided into upper and lower halves at the part where the turnbuckle is attached, and a threaded groove is carved on each end of the piano wire 6, and these parts are threadedly engaged with the turnbuckle 81, respectively.

Furthermore, as the mass body δ, a lead molded into a substantially rectangular shape that is thinner than the thickness of the frame is used, and when it is fixed at a predetermined position above and below with an elasticity value of 6, the shoulder circumference of the mass body 5 is A gel layer 7 based on silicone gel is arranged,
This gel layer 7 is covered with transparent plastic plates 9 from the front and back so that the gel layer is interposed between the mass body and the side wall of the hollow portion. Therefore, in this embodiment, the plastic plate 9 also serves as a side wall constituting the hollow portion.

Here, the gel layer based on silicone gel has JI
Silicone gel itself or a composite silicone gel formed by mixing microscopic hollow spheres therein is suitable, and has a penetration degree of about 50 to 200 as measured by SK 2530-1976 (50g load). For example, Toray Silicone CF3027 manufactured by Toray Silicone Co., Ltd. and KE- manufactured by Shin-Etsu Chemical Co., Ltd.
1051, and examples of the micro hollow spheres mixed therein include Phyllite (registered trademark) manufactured by Nippon Phyllite Co., Ltd. and Expancel (registered trademark) sold by the company. Of course, it is not limited to this, and it may be reinforced with silica or the like, and the gel layer and mass body may be
It is desirable to strengthen the adhesion with a suitable adhesive such as V-rubber.

Therefore, when a tennis ball is hit using such a tennis racket 1, the impact force generated on the ball hitting surface is transmitted sequentially from the ball hitting part 2 of the frame, which is a rigid skeleton, to the handle part 3. , the shock wave passes through the mass body 5 through the elasticity value 6
This will cause the mass body 5 to be photographed. This vibration of the mass body 5 is caused when the weight of the mass body 50 at that time, the elasticity value 6, the spring constant of the piano wire in the example, the damping force due to gel N7, etc. match the weight of the frame, the natural frequency, etc. In addition, the structure of the hollow part 4 of the frame in which the mass body 5 is arranged acts as a so-called dynamic vibration absorber, minimizing the vibration of the frame, and the imaging propagated to the mass body 5 can be returned to the frame again. Almost all of it is absorbed in this part.

For example, if you have just installed Guttu 22,
The natural frequency of the frame was relatively high, and at this point, the weight of the mass body 5, the spring constant with an elasticity value of 6, the damping force of gel N7, etc. matched the weight and natural frequency of the frame. However, during use, the guts loosen and the natural frequency of the frame changes slightly, so the structure of the hollow part 4 of the frame in which the mass body 5 is arranged is effective as a dynamic vibration absorber. It becomes difficult to act. When such a state is reached, by rotating the turnbuckle 81 to further tighten the elasticity value 6, balanced and efficient vibration absorption can be achieved again. This does not only depend on the tension of the gut, but also on various conditions such as grip position, arm length, grip strength, arm strength, and even the temperature and humidity of the day. It is possible to similarly balance changes in the natural frequency when viewed as follows.

In the above embodiment, the bifurcated portion of the grip handle 3 is connected to the hollow portion 4.
The piano wire is stretched across the frame from the base of the bifurcated portion 31 to the horizontal frame piece 21, and the mass body δ is supported by the piano wire. However, the present invention is not limited to this, and may be configured as shown in FIGS. 2 to 5, for example.

In the one shown in FIG. 2, an elastic value 6 like a guitar string is stretched across the bifurcated part 31, and one end of the elastic part 31 is freely wound with a winding tool 84 consisting of a combination of a gear and a pinion. This allows you to adjust the level of tension. Further, the mass body 5 is fixed at the center, and disposed within a vibrator 91 whose both ends are closely adhered to the inner wall of the bifurcated portion 31 of the frame, and between the vibrator 91 and the mass body 5 as described above. A gel layer 7 is interposed therebetween. Of course, it is also possible to close both ends of this vibrator with a lid body, create a part with an elastic value stretched between the left and right lid bodies, and then glue and attach this to the bifurcated part later.In this case, the winding tool As 84, an attachment such as a guitar may be used, and
Instead of being stretched horizontally, it may be stretched vertically as in the previous embodiment.

In the embodiment shown in FIG. 3, the gripping part 32 of the frame is formed hollow, and the vibration absorbing unit is built into the hollow part 4, and the surrounding area is filled with foamed resin to hold the vibration absorbing unit. It is adhesively fixed within the portion 32.

This vibration absorbing unit) 10 comprises a unit case including a bottomed cylindrical body 11 and a lid body 12 that seals the open end of the unit case, and an elastic value 6 such as a guitar string or wire is stretched across both ends of the unit case. A mass body 5 is supported approximately at the center, and a gel layer 7 similar to that described above is interposed around the mass body 5 in the space between it and the unit case.

In addition, in order to tension the elasticity value 6, a screw groove is carved in the lid 12, and a screw 13, which is made up of a screw portion 131 and a twist prevention portion 132, is screwed into the screw groove. One end of the elastic value 6 is attached to the twisting prevention portion 132 to make the elastic value 6 tensionable and to prevent it from twisting. Further, a nut 14 is screwed onto the screw 13 from the outside, so that the screw 13 can be fixed in an appropriate position by tightening the W nut.

Therefore, in this example, remove the grip cap 15,
First, loosen the nuts 14, then rotate the screws 13 to adjust the tension, and then tighten them again with the nuts 14 to adjust the tension with an elasticity value of 6 from the outside of the grip 32. It becomes possible.

Although it is easy to manufacture the unit case of the vibration absorbing unit 10 in a cylindrical shape, the tennis racket gripping portion 32
Since the cross-sectional polygon is Kaya-dori, it may also be rectangular or the like.

4 and 5 are examples in which a mass body 6 is supported in a cantilever manner by a piano wire or the like having an elasticity value of 6. It is also possible to install the mass body 6 directly inside the rigid skeleton of the frame. However, in the illustrated embodiment, a vibration absorbing unit made into parts is embedded in the same manner as described above.

That is, in the one shown in FIG. 4, a mass body 5 is supported on one side of the cylindrical body 11' via a cylindrical gel layer 7 similar to the above, and this mass body 5 has an elastic value 6 of a piano wire or the like. The other end of the elastic member 6 is fixed at an appropriate position on the other side of the cylindrical body 11' by a movable fixture 16. Therefore, the movable fixture 16 includes a threaded element 161 integrally formed with a stepped threaded part 161a and an outer peripheral threaded groove 161b, a tightening block 162, and a block retainer 1.
63, and a ring nut 14'. That is, the stepped threaded part 161a has a conical groove formed in the center of the threaded element 161, and a threaded groove carved in the stepped part around the threaded part 161. A conical tightening block 162 made of a solid block is fitted, and a block retainer 163 is screwed into the short groove from the outside.
The tightening block 162 is pressed down. At this time, one end of the elastic value 6 is inserted into the middle end of the tightening block 162, and by pressing the tightening block 162, the elastic value 6 can be fixed to the threaded element 161. Further, the entire screw element 161 has a short groove 161b on its outer circumference screwed into a short groove on the inner circumference of the cylindrical body 11', and can be tightened with a W nut using a ring nut 14'.

Therefore, first, by loosening the ring nut 14' and the block presser 183, the fixation of the elasticity value 6 is released and the entire screw 16 becomes movable within the cylindrical body 11'. Therefore, the length from the mass body 5 with an elasticity value of 6 to the end fixed by the tightening block 162 is adjusted by moving the entire screw 16, and then tighten the ring nut 14' and the block presser 163 again at the appropriate position. If so, the cantilever length can be adjusted and fixed.

In the one shown in FIG. 5, the screw 17 has a disk shape in which an elastic value 6 with a groove Il is fixed in the center and short grooves of the same pitch are carved on the outer periphery. Buried pipe 5
A short groove is formed in 1, and the screw 7 is connected to the cylindrical body 11'.
At the same time, the mass body 5 is also screwed with an elasticity value of 6, and the threaded element 17 can be tightened with a W nut at the ring nut 14'. Therefore, when the ring nut 14' is loosened and the screw 17 is rotated, the elastic value 6 moves in the mass body δ, and the screw 17 moves integrally in the cylindrical body 11', and as a result, the mass body 5 The cantilever length from to the fixed end with the screw 17 is adjusted.

Then, by tightening the ring nut 14' again, the length can be fixed as appropriate. In this case, it is preferable to apply a highly viscous substance such as grease to the threaded portion between the mass body 6 and the elasticity value 6 to ensure vibration transmission and facilitate screw insertion.

Although a tennis racket has been described as an example above, the ball-hitting exercise equipment of the present invention is not limited to this, but can also be applied to baseball bats, golf clubs, and other ball-hitting tools.

For example, in the case of a baseball bat, the vibration absorbing unit may be installed inside the gripping part or the ball hitting part, or a mass body may be installed inside so that it is directly supported by the elastic value and restrained by the gel layer. It may be installed internally.

Further, in the case of a golf club, when it is installed directly in the club head which is the ball hitting part, for example, as shown in FIGS.
You can do it as shown in the figure.

That is, FIG. 6 shows a head portion which is a ball hitting part of a wood type golf club, 20 is an insert which is a ball hitting surface, 30 is a sole plate, and these are made of Kayatoshi metal material. Reference numeral 40 denotes the body of the club head, which is usually molded from persimmon wood, and has a socket portion 401 formed on its upper surface, to which a shaft serving as a grip portion is attached, although not shown. A vibration absorbing unit similar to that shown in FIG. 3 is fitted into the sole plate 30 substantially perpendicularly thereto. For this reason, the body has a stepped hole 4 for embedding the vibration absorption unit.
02 is opened vertically, and its upper surface is reinforced with a metal ring 403.

The vibration absorbing unit is almost the same as the above embodiment, and a unit case is made up of a bottomed cylindrical body 11 and a lid body 12 that seals the open end of the unit case, and elastic value 6 of guitar strings, wire, etc. is stretched across both ends of the unit case. A mass body 5 is supported around the center of the mass body 5, and the gel layer 7 is interposed around the mass body 5 in the space between it and the unit case. A short groove is carved in the lid body 12, and a screw element 13, which is an integral part of a screw part and a twist prevention part, is screwed together.

This screw 13 protrudes slightly from the body, and a nut 14 is screwed into the protrusion.

Therefore, in this case as well, the tension of elasticity value 6 can be adjusted from the upper surface of the club head in the same manner as described above.

In the one shown in FIG. 7, the insert 20' is the bottom part of the vibration absorbing unit, and the screw 13 is inserted from the rear of the club head. ! In addition, silicone gel 71 is also filled around the vibration absorbing unit.

In the above embodiments, the hard frame material of the frame was explained as being made of glass fiber reinforced plastic, persimmon wood, and metal materials, etc., but the present invention is not limited to this, and it may be made of carbon fiber reinforced material. In addition, single wood, laminated wood, wood reinforced with fiber reinforced plastic, drawing of aluminum, other alloys, etc., metal molding, thermoplastic, injection molding of thermosetting resin, etc.
It goes without saying that it can be applied in the same way even if the material is transfer molded, compression molded, or made by combining these materials, and the formation of the hollow part in which the mass body is placed can also be performed in the same way as the bifurcated part or the part in the above embodiment. It is not limited to the grip portion or the inside of the glove head, but may be other portions, and may be configured in accordance with the form of each ball-striking exercise device.

In addition, in the above embodiment, guitar strings, wires, and piano wires are used as elastic strings, but they are not limited to so-called string-shaped strings. It also includes tensile resin threads and the like.

Although not shown, short grooves are carved on almost the entire surface of the elastic string, and the mass body is clamped from above and below with nuts that are screwed into the short grooves, thereby changing the mounting position of the mass body relative to the elastic string. Furthermore, a configuration may be adopted in which a pressing force is applied to the gel layer so that the restraining force from the gel layer to the mass body can be varied, and the pressing force can be adjusted.

Furthermore, the gel layer is not limited to being interposed around the sides of the mass body as in the above embodiment, but may be placed on the end face or all around the four sides, but in this case, at least a gel layer is provided in the hollow part. It is desirable that a space is secured in which the mass body can deform and move. In addition, a foam layer is provided on the side of the gel layer,
The gel layer may be fixed and a deformation area may be ensured.

Effects of the Invention As described above, according to the ball-hitting exercise tool of the present invention, the hollow part of the frame in which the mass body is arranged acts exactly as a so-called dynamic vibration absorber, and the impact vibration at the time of hitting is caused by the vibration of the mass body. Since it can be replaced, there is very little transmission of information to the palm of the person's hand at the grip, and it converges in a short period of time, providing a comfortable hitting feeling and solving the problem of sports injuries. becomes.

Moreover, this is due to differences in grip position, arm length, and
The spring constant of the elastic string that supports the mass body changes in response to changes in grip strength, arm strength, the tension and length of use of the ball-striking tool itself, as well as changes in conditions such as the temperature and humidity of the day. You can make subtle changes and balance by adjusting the holding length, so you can always keep it in the optimal condition.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the main parts of a tennis racket as an embodiment of the ball hitting exercise device of the present invention, and Fig. 2 shows an embodiment of the bifurcated part, and shows the main parts of the bifurcated part. The front view and FIGS. 3 to 5 show an embodiment of the gripping part, and the sectional views showing the main parts of the gripping part, and FIGS. 6 and 7 show the embodiment applied to a golf club. FIG. 2...Ball hitting part 3...Grip handle part 4...
... Hollow part 5 ... Mass body 6 ... Elastic string 7 ... Gel layer

Claims (2)

[Claims] (1) In a hollow part formed in a part of the frame of a hard skeleton body that connects a ball hitting part and a handle part, a mass body is moved to the opposite wall of the hollow part without contacting each side wall that makes up the hollow part. A gel layer made of silicone gel having a penetration degree of about 50 to 200 is interposed between the mass body and the side wall of the hollow part, and the elastic string is supported by an elastic string stretched between the mass body and the side wall of the hollow part. is a ball hitting exercise device characterized by its tension being adjustable. (2) In a hollow part formed in a part of the frame of the hard skeleton body that connects the ball hitting part and the handle part, the mass body is moved to one side wall of the hollow part without contacting each side wall that makes up the hollow part. A gel layer made of silicone gel having a penetration degree of about 50 to 200 is interposed between the mass body and the side wall of the hollow part, and , an exercise device for hitting a ball, characterized in that the cantilever length of the elastic string is adjustable.