JPH084043Y2 - Racket head side frame - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a racket head side frame, and in particular, a racket capable of reducing vibration waves due to a shock received from a racket head ball at the time of hitting and reducing movement injury to a user. Regarding the head side frame.

[Conventional technology]

Tennis is one of the most popular sports at the moment, but the vibration generated when hitting a ball with a racket is transmitted directly from the hand to the muscles of the human body through the steering wheel, causing local injuries. In addition to the tennis elbow,
Occasionally, it will hurt the arm or shoulder. If you look at the example of the vibration wave curve diagram when you hit the ball shown in FIG.
The amplitude value of the maximum vibration wave is 6.2 G (cm / sec ² ), and the decay time of the maximum vibration wave is about 89.10 MS. Therefore,
How to reduce the vibrations that occur on the racket is a goal that manufacturers are eagerly pursuing, while it is also a criterion for tennis players to evaluate the quality of the racket. Most of the currently used racket vibration reduction methods use a vibration isolation device attached to the side frame or gut of the racket. However, although these methods have vibration isolation effects, they are listed below. The problem remains. First, it is an extra expense for the consumer because an unplanned device must be installed. Second, because the vibration isolation device must be installed together when the gut is passed through the side frame, a gut-tight racket must be installed. After purchase, the gut must be removed and then re-inserted in order to install the anti-vibration device. Thirdly, when the gut is replaced, the dealer or user may be equipped with such equipment. However, it is desirable that a relatively ideal method of reducing the vibration wave of the racket is provided with the side frame itself having a function of reducing the vibration.

[Problems to be solved by the device]

The present invention is intended to solve the above problems in the conventional racket, and an object thereof is to provide a racket capable of reducing vibration waves generated when a ball is hit with the racket and preventing movement injury.

[Means for solving the problem]

This invention is a racket that integrally connects a shaft including a handle and a head including a side frame in which a gut is stretched in a mesh shape. The object is achieved by a configuration in which the thicknesses in the left and right corresponding portions are asymmetrically different in size and the average value of the thicknesses in the left and right corresponding portions of the left and right side frames is equal over the entire side frame.

Further, C ₁ point and C ₂ point are respectively provided at appropriate positions on the center L formed by the extension line of the shaft axis on the side frame, and they respectively correspond to the head both side frames close to the C ₁ point. Set A ₁ point and A ₂ point, and also set B ₁ point and B ₂ point respectively corresponding to the head side frames close to the C ₂ point, and further,
The size of the cross section of the side frame between the points A ₁ and B ₁ and the cross section of the side frame between the points A ₂ and B ₂ are varied asymmetrically with respect to the thickness at the corresponding left and right portions. It is even more preferable that the average value of the thicknesses of the left and right side frames corresponding to the left and right sides be equal over the entire side frame.

[Action]

As described above, according to this invention, the cross sections of the portions where the head side frames face each other in an axially symmetrical manner are formed to have complementary thicknesses that are different in size from each other as a whole. It is considered that the vibration wave is transmitted to the both side frames via the gut, and the vibration wave is canceled and reduced while being transmitted through the both side frames of the head, and further, the center formed by the extension line of the shaft axis line above the side frame. At appropriate positions on the line L, point C ₁ and
C ₂ points are provided, and A ₁ points and A ₂ corresponding to the head side frames close to the C ₁ point are set, and B ₁ points corresponding to the head side frames close to the C ₂ point are also set. Set the B ₂ point, and if the side frame cross section between the A ₁ point and the B ₁ point and the side frame cross section between the A ₂ point and the B ₂ point respectively have different sizes in the corresponding left and right regions. However, it has an asymmetric complementary relationship in which the average thicknesses of the cross sections of both side frames are averaged with each other, and it is finely reduced by the canceling interference of the vibration waves transmitted through the both side frame of the head. It is a thing.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

〔Example〕

As shown in FIGS. 1 and 2, the tennis racket in which the thicknesses of the head side frames of the present invention are complementary to each other is composed of a shaft 10 and a racket head 20, and the racket head 20 extends along the center of the shaft 10. Frame top through the front
On the center line L reaching 25, C ₁ point and C ₂ point are respectively provided at appropriate positions as shown in the drawing, and the head is close to the C ₁ point.
Each 20 side frames set the corresponding A ₁ point and A ₂ points, said C ₁
A point A ₁ point and the C ₁ point A ₂ point are connected to form an angle θ ₁ at the C ₁ point, and on the other hand, B ₁ points corresponding to both side frames of the head 20 close to the C ₂ point Set B ₂ point, and set C ₂ point, B ₁ point and C ₂ point
The point θ and the point B ₂ are connected to form an angle θ ₂ at the point C ₂ ,
Furthermore, the side frame cross section between the A ₁ point and the B ₁ point and the side frame cross section between the A ₂ point and the B ₂ point have different thicknesses asymmetrically, but the left and right corresponding parts respectively. In the side frames having different thickness distributions on both sides of the center line L, there is a relation that the average value of thicknesses in
The vibration waves of the head 20 are individually received and reduced while interfering with each other and transmitted to the shaft to prevent the occurrence of motion injury.

As can be seen in cross-sectional view showing a side frame of the head 20 in FIG. 1, it is possible to distinguish the change in cross-sectional shape of the side frame of the head 20 substantially four parts, A from A ₂ points of the first stage 21 The cross-sectional shape up to _one point (that is, within the range of the critical angle θ ₁ ) gradually becomes thicker from a thin one (in this embodiment, the thickness is from 22 mm to 22 mm).
The second stage 22 has a thickness of 28 mm at the A ₁ point, which changes from 28 mm to about 25 mm in the middle, and finally becomes 22 mm at the B ₁ point. In the third stage 23
The thickness of the _one point B converges to 16mm at its central portion from 22 mm (i.e. lowermost point of the head-side frame), or changed to 28mm at _two points B, the thickness of the _two points B in the fourth stage 24 From 28 mm to 25 mm, and finally A ₂ points to 22 mm. That is, the thickness of the frame cross-section during this period changes alternately, from a thick cross-section to a thin cross-section, and from a thinner cross-section to a thicker cross-section, a head with a balanced balance with a mixture of different thicknesses. 20 side frames are formed, and when a vibration wave is generated by hitting a ball with this racket, the vibration wave is transmitted from the gut to the side frame of the head 20, and from the change in the thickness shape of each part of the head side frame. The vibration waves can be canceled by each other and reduced. As can be seen from the side views of FIGS. 3A and 3B, the change in the cross-sectional shape of the side frame of the head 20 is such that the thickness shapes of the both side frames (comparing the second step and the fourth step) are just opposite to each other. Show me.

As shown in FIG. 4, the racket constituted by such side frames has an amplitude value of the maximum vibration wave of about 4.2 G (cm / sec ² ) when a tennis ball is hit, and the vibration wave is attenuated. The time is almost 63.83MS, both of which are about 6.2G (cm / sec ² ) in amplitude of the maximum vibration wave of the conventional racket, and much lower than the decay time 89.10MS. Tells that it has a positive effect. These numerical values were obtained by measuring with a computer YEW-3655 manufactured by Yokogawa Electric Corporation.

[Effect of device]

In the present invention configured as described above, since the cross sections of the portions where the two side frames of the head face each other on the left and right sides are formed to have complementary thicknesses of different sizes throughout, vibration waves generated when the ball is hit with a racket. Is transmitted to the both side frames of the head via the gut, and it is considered that the vibration waves are canceled and reduced while being transmitted through the both side frames, so that the movement injury of the human body can be prevented.

Moreover, C ₁ points and C ₂ points are respectively provided at appropriate positions on the center line L formed by the frame top above the head side frame and the shaft center, and both head side frames close to the C ₁ point are provided. Set A ₁ point and A ₂ point respectively corresponding to
Respectively to the head side frames set the corresponding B ₁ and B ₂ points close to the C ₂ points, and a side frame section located between the A ₁ point and B ₁ point
The size of the cross section of the side frame between points A ₂ and B ₂ should be different so that the thickness of the corresponding parts on the left and right differ, but the overall thickness of the cross sections on both sides should be kept in a complementary balance. Therefore, the vibration waves transmitted through the both side frames of the head are finely reduced by the canceling interference, and the worry about the occurrence of motion injury is alleviated.

[Brief description of drawings]

FIGS. 1 and 1 (a) to (d) are a front view of a racket head side frame of the present invention and a sectional view of each part of the head side frame, and FIG. 2 is a schematic perspective view of the racket of FIG. Figure,
3A and 3B are left and right side views of the racket head side frame of the present invention, FIG. 4 is a vibration wave curve diagram generated when a ball is hit by the racket of the present invention, and FIG. It is a vibration wave curve figure which occurs when a ball is hit with a racket. 10: Racket shaft 20: Racket head

Claims (2)

[Scope of utility model registration request] 1. A racket formed by integrally connecting a shaft (10) including a handle and a head (20) including a side frame in which a gut is stretched in a mesh shape, wherein the side frame is an axis line of the shaft (10). With the extension line as an axis, the thicknesses of the left and right side frames corresponding to the left and right sides are asymmetrically different in size, and the average thickness of the left and right side frames corresponding to the left and right sides is equal over the entire side frame. Racket head side frame. 2. C ₁ points and C ₂ are provided at appropriate positions on a center L formed by an extension line of the shaft axis on the side frame of the head (20), and close to the C ₁ point. Set A ₁ points and A ₂ points respectively corresponding to the head (20) side frames, and also set B ₁ points and B ₂ points corresponding to the head (20) both side frames close to the C ₂ point, respectively. Further, the size of the side frame cross section between the A ₁ point and the B ₁ point and the size of the side frame cross section between the A ₂ point and the B ₂ point are asymmetrically different in the thickness at the corresponding left and right portions. 2. The racket head side frame according to claim 1, wherein the racket head side frames are formed so that the average values of the thicknesses of the left and right side frames corresponding to the left and right sides are equal over the entire side frame.