JPH01249077A - Sport goods for striking ball - Google Patents

Abstract

PURPOSE:To secure the comfortable ball strike feeling and prevent the generation of sport disease by laminating the gel layers containing silicone gel having a needle penetration degree within a specific range as basic material and mass bodies alternately into a part of the frame of a hard skelton body which consists of a ball strike part and a grip part. CONSTITUTION:A circular hole is formed at the root of the bifurcated part 31 of a frame, and a cylindrical case 4 is fitted into said circular hole, and gel layers 51 and 52 and mass bodies 61 and 62 are superposed. Therefore, a cylindrical mass body 62 is arranged at the center, and the ring-shaped gel layer 52 is arranged on the periphery, and the ring-shaped mass body 61 is arranged on the periphery, and further the ring-shaped gel layer 51 is arranged, alternately in double form. Therefore, the weight of the mass body is made different accordingly. As the gel layer containing silicone gel as basic material, the silicone gel having a needle penetration degree of 50-200 and the complex silicon gel mixed with the microhollow spherical bodies is suitably used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ball-hitting exercise device such as a tennis racket, a baseball bat, or a golf club.

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. Ike, where there are a lot of
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 general, these ball-hitting tools generally have several resonance frequency bands, and each person's grip position is different, as well as arm length, grip strength, and arm strength, etc.
Because the tension of the gut, the amount of time it takes to use it, and even the temperature and humidity of the day vary widely, its vibration characteristics are not uniform.

Means for Solving the Problems In order to solve the above-mentioned problems, the ball hitting exercise device of the present invention has a penetration depth in a part of the frame of the hard skeleton body that connects the ball hitting part and the handle part. It is characterized in that about 50 to 200 silicone gel-based gel layers and mass bodies are alternately laminated in multiple layers.

Function: Since the ball hitting exercise device of the present invention is as described above, the impact generated at the ball hitting portion only vibrates the mass body and is transmitted to the palm of the person gripping the ball at almost the tip of the handle. There will be very few cases.

That is, vibrations generated by the impact caused by the hit ball are transmitted to the mass body via the gel layer. However, the gel layer has little rebound resilience and damps and absorbs the vibrations of this mass body.

This is because the gel layer acts as an elastic body that supports the mass body, and at the same time acts as a viscous body that dampens the vibrations of the mass body.
If the weight of the mass body, the thickness of the gel layer, its viscoelastic properties, etc. match the weight of the frame, the inherent vibrational frequency, etc., a structure in which the gel layer and mass body are laminated can be used as a so-called dynamic vibration absorber. Because it works, the gel layer and mass body are alternately multilayered! III! By doing so, it is balanced with a certain tolerance for differences in grip position, arm length, grip strength, arm strength, tension, time required for use, and even various conditions such as the temperature and humidity of the day.

Embodiment Fig. 1 is a front view of the main parts of a tennis racket (1) 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 formed by layering the surrounding surface of the grip handle material. 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-mentioned frame is integrally made of a shaft material of glass 1A fiber reinforced plastic with a core material of foamable synthetic resin. There is a method of wrapping prepreg, which is a fiber-reinforced plastic molding material, around a core material and molding it under heat and pressure in a mold. After obtaining the shaft material, there is also a method in which the shaft material is bent and fitted into a mold to be heated and press-molded. 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 on this horizontal frame piece 21, the catgut line that becomes the ball hitting surface and the thread end of the gutt 22 made of nylon thread are attached. It 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 such a frame, in the embodiment, the bifurcated portion 3
Gel layers and mass bodies are laminated in alternating multilayers at the base of 1.

That is, a circular hole is bored at the base of the bifurcated portion, the cylindrical case 4 is fitted into the hole, and the gel layer 51.52 and the mass body 61.62 are laminated therein. For this purpose, a cylindrical mass body 62 is arranged at the center, a ring-shaped gel layer 52 is placed around it, a ring-shaped mass body 61 is placed around the ring-shaped gel layer 52, and a ring-shaped gel layer 51 is formed around the cylindrical mass body 62. There are layers. For this reason, the mass and weight are naturally different from each other. In addition, a cover body 41 made of transparent resin or the like is fitted into the end face of the cylindrical case 4, and at this time, as shown in FIG. The gel layer 51.52 and the mass body 61.62 are not in contact with the lid body 41, and the structure allows deformation of the gel layer and movement of the mass body upon impact. ing.

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 to be 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 l, the shock waves generated on the ball hitting surface are transmitted sequentially from the ball hitting part 2 of the frame, which is a rigid skeleton, to the grip part 3. The shock wave is transmitted to the gel layer 5 at the bifurcated part.
It also propagates to the mass body 61 supported by 1, causing this mass body 61 to vibrate. Here, this mass body 61
Since the gel layer 52 and the cylindrical mass body 62 are further loaded inwardly, it vibrates as a mass body with an additional alpha load. Furthermore, vibrations are transmitted to the inner cylindrical mass body 62 via the two gel layers 51 and 52. At the same time, gel F! 51.
52 itself has little repulsion resilience, and the mass body 61 rapidly
．． 62 vibrations are damped. Therefore, this gel layer 51
．． 52 and the mass body 61. When the lamination conditions of 62 match the weight and natural frequency of the frame, this part acts as a so-called dynamic vibration absorber, minimizing the vibration of the frame and reducing the mass. Most of the vibrations propagated to the body are absorbed in this part, without being returned to the frame.

This is because the gel layer and the mass body do not exist as a single layer, but as an alternating multilayer stack, so there are several resonant frequency bands, and depending on the person, the grip position and arm length, grip strength, arm strength, e.g.
It allows for a certain amount of variation in the natural frequency when considering the human body from the ball-striking exercise equipment as a vibration system, due to various conditions such as the tension of the gut, the amount of time it has been used, and even the temperature and humidity of the day. This means that it can be balanced evenly with a certain width.

The one shown in FIG. 3 is a modification of the above-mentioned embodiment, in which the alternating multilayer stack of gel layers and mass bodies can be replaced as a vibration absorbing part 70. For this reason, the one side lid 41' of the cylindrical case 4' is screwed together.
Gel N 51, 52 and mass body 61 in cylindrical support 42
．． 62 are laminated in multiple layers alternately, hard O-rings 8 are arranged at both ends of this cylindrical support 42, and when placed in the cylindrical case 4', the O-rings 8 are slightly crushed by the lid 41'. The end face of the cylindrical support body 42 is fixed. Therefore, the vibration absorbing parts 70, which are formed by alternately laminating gel layers and mass bodies within the cylindrical support body 42, are available in many different combinations of the thickness of the gel layer, its material, the weight of the mass body, etc. You can choose and set the one that gives you the best feeling over time.

In FIG. 4, two embodiments are shown at the same time in which the forked portion 31 is sandwiched, one of which is a 71 which is sandwiched between the bases of the forked portion, and the other is the horizontal frame piece 21. 72, which is sandwiched between both corners of. For this reason, the former is a transparent material that is formed into an appropriate shape from the outside by laminating a gel layer 51.52 and a mass body 61.62 in a triangular polycyclic shape and pressing the outer gel layer 51. It is fixed with a resin plate 711 or the like. In this case, the transparent resin plate is preferably adhered to the frame or fixed with a double-sided adhesive tape, etc., and of course, a deformation area that allows the deformation of the gel layer and the movement of the mass body is secured so that the plate can be stopped.

In addition, in the latter, suction parts having the same structure as the former are arranged symmetrically and fixed by pressing with a similar transparent resin plate 721 attached to a plate spring 722 or the like. In this case, it is particularly desirable to mold the transparent resin plate 721 into a shape that can hold the frame so that it does not come off due to impact.

FIG. 5 shows a device placed inside the grip portion of a racket, and in this example, the gel layer and the mass body are not annular but are laminated in a flat plate shape.

In addition, in order to make this part into a vibration-absorbing part, a threaded groove is formed on the hard part end 321 of the inner frame of the gripping part, and a gel layer 51, 52, 53 and a mass body 61, 62 are formed on the base 9 with a screw protruding from it.
．． 63 and are laminated in multiple layers alternately, and the lid body 322 is placed over this. In this case, as the case may be, the press screw 91 may be screwed into the lid body 322 as shown by the two-dot chain line.
The stacked layer of the gel layer and the mass body may be pressed at the tip to compress the gel layer and change its properties, thereby making it possible to adjust the properties in a further variety.

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 parts may be installed inside the gripping part or the ball hitting part, or the gel layer and the mass body may be directly laminated inside.

Further, in the case of a golf club, a structure similar to that of the tennis racket can be adopted, but when it is installed inside the club head, which is the ball-hitting part, it may be arranged as shown in FIG. 6, for example.

That is, FIG. 6 shows a head portion which is a ball hitting portion of a wood type golf club, 20 is an insert which is a ball hitting surface, 30 is a sole plate, and these are usually made of metal material. Reference numeral 10 denotes the body of the club head, which is usually molded from persimmon wood, and has a socket portion 101 formed on its upper surface, to which a shaft serving as a grip portion is attached, although not shown. In the embodiment, a blind hole 102 is drilled at the rear of the insert, into which the gel layer 51, 52, 53 and the mass 61.
62 and 63 are stacked in a polycyclic manner. At that time, in the embodiment, a foam layer 103 is placed before and after the gel layer and the mass body.
is provided to enable positioning of the gel layer and mass body, as well as their deformation and movement. Note that in this case, a highly resilient foam layer is advantageous.

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 and other alloys, metal molding, injection molding of thermoplastic and thermosetting resin, etc.
Of course, it can be applied in the same way even if the material is transfer molded, compression molded, or a combination of these, and the portions where the gel layer and the mass body are alternately laminated in multiple layers can also be applied in the same manner as in the above embodiment. It is not limited to the bifurcated portion, 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, when preparing vibration-absorbing parts, prepare a large number of silicone gels with various changes in the material and thickness of the silicone gel used for the gel layer, the shape of the mass body, the contact surface with the gel layer, the weight, etc. It is best to choose a ball that feels good when you hit it.

Effects of the Invention As described above, according to the ball hitting exercise tool of the present invention, the portion in which the gel layer and the mass body are laminated acts as a so-called dynamic vibration absorber, and the impact vibration at the time of hitting is suppressed by the movement 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, since the gel layer and the mass body do not exist as a single layer, but in a multi-layered state, the position of the person's grip, arm length, grip strength, arm strength, for example, the tension of the gut, It closes when fully used and absorbs vibrations to some extent to accommodate differences in conditions such as temperature and humidity on that day.

[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, FIG. 2 is a sectional view of the main parts, and FIG. 3 is a main part of another embodiment of the tennis racket. FIG. 4 is a front view showing the main parts of the embodiment at the bifurcated part, FIG. 5 is a sectional view showing the main parts of the embodiment at the grip part, and FIG. 6 is an embodiment applied to a golf club. FIG. 2 is a cross-sectional view showing the main parts of the club head. 2...Ball hitting part 3...Grip handle part 51.5
2.53... Gel layer 61.62.63... Mass body

Claims (1)

[Claims] Gel layers based on silicone gel with a penetration degree of about 50 to 200 and mass bodies are alternately laminated in multiple layers on a part of the frame of a hard skeleton body that connects the ball hitting part and the handle part. A ball hitting exercise device characterized by: