JPH07275401A - Racket - Google Patents

Abstract

PURPOSE:To enable a player to select ball repulsion performance and to attain compatibility of the excellent repulsion performance with high spin performance. CONSTITUTION:This racket is provided with a frame 1 for segmenting a gut extending space 2 having nearly an elliptic shape. Gut 3 is inserted into the plural gut insertion holes formed at the frame 1. The gut 3 is extended longitudinally and transversely in the gut extending space 2 to form a ball hitting surface 4. A shaft 7 consisting of a gripping part 5 and a throat part 6 is integrally joined to the bottom part 1b of the frame 1 and the throat part 6 is branched to a fork from the gripping part 5 to extend the throat parts which are connected to the frame 1 at the front ends. The form of the throat parts 6 is internally provided with a piece of a bridging part 8 extending nearly parallel with the bottom part 1b of the frame 1. The bridging part 8 is provided with plural pieces of through-holes 9 permitting insertion of the longitudinal gut 3a in the central part of the extension direction thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a racket suitable for use in tennis, a racket ball, and the like, which enables selection of the resilience performance of a ball, and also has excellent resilience performance and high spin. It is possible to achieve compatibility with performance.

[0002]

2. Description of the Related Art As shown in FIG. 4, a racket that has been widely and conventionally used for tennis has a frame f for partitioning an almost oval-shaped gut tension space, and the frame f is provided on the frame f. The gut g is inserted through the formed gut insertion holes, and the gut g is extended vertically and horizontally in the gut tension space to form a ball striking face st, and the shaft is formed on the bottom portion b of the frame f. The shaft s is composed of a grip portion h and a slot that extends from the grip portion h in a bifurcated manner and extends toward the end and is continuous with the frame f at the tip. And part t.

On the other hand, as a racket proposed for the purpose of improving the resilience performance of the ball, enlarging the sweet spot, reducing the energy loss, and reducing the impact on the player's arm. There is one disclosed in Japanese Patent Laid-Open No. 58-216077. This is one in which, among the guts stretched over the gut tension space, most or all of the vertical gut extends to the throat portion of the shaft.

[0004]

By the way, in the conventional racket shown in FIG. 4, the extending length of the gut, especially the vertical gut, is uniquely determined by the contour dimension defined by the frame f. So, in one racket,
Although the repulsion performance of the racket can be changed to some extent by changing the gut tension, there is a disadvantage in that it cannot be greatly changed, that is, the repulsion performance cannot be greatly improved.

On the other hand, in the racket disclosed in Japanese Patent Laid-Open No. 58-216077, by extending most or all of the vertical gut to the throat part, the extension length of the vertical gut is entirely increased. Since it becomes longer, there is a problem that the repulsion performance of the ball is improved over almost the entire hitting surface, resulting in a decrease in spin performance. Moreover, since the extension length of the gut is uniquely determined by the size of the frame portion, the repulsion performance of the racket cannot be selected.

The present invention has been made as a result of studies to solve such problems of the prior art, and a single racket has both high ball repulsion performance and high spin performance. It is an object of the present invention to provide a racket that can be made to have a desired resilience performance.

[0007]

The racket of the present invention comprises:
A frame that divides the almost oval gut tension space is provided, and the gut is inserted into the gut insertion holes formed in this frame, and the gut is stretched vertically and horizontally in the gut tension space to form a ball striking face. Then, a shaft consisting of a grip portion and a throat portion is integrally joined to the bottom portion of the frame, and the throat portion is branched into two from the grip portion and extends toward the end, and is connected to the frame at the tip. In this configuration, at least one bridging portion extending substantially parallel to the bottom portion of the frame is provided in the throat portion, and the vertical gut is inserted through the central portion of the bridging portion in the extending direction. Is provided with a plurality of through holes. Here, more preferably, the number of the through holes is 2 to 6. The term “substantially elliptical” as used herein includes not only an accurate elliptical shape, but also a so-called oval shape, an oval shape, or the like.

[0008]

In this racket, the vertical gut is inserted into the through hole provided in at least one bridge portion, and the length of the vertical gut is lengthened as required, so that the extension part of the vertical gut is extended. , The resilience performance of the ball can be enhanced as required. On the other hand, in the portion where the vertical gut is inserted only in the gut insertion hole provided in the frame, high spin performance can still be exhibited.

In this racket, all the vertical guts can be inserted only in the frame, and in this case, the same resilience performance and spin performance as the conventional racket can be provided. By the way, when 2 to 6 through holes of the bridge portion are formed in the central portion in the extending direction, the spin performance and the repulsion performance can be more effectively made compatible with each other.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention,
In the figure, reference numeral 1 denotes a frame, and the frame 1 defines a substantially oval-shaped gut stretching space 2 in which the top portion 1a is wider than the bottom portion 1b.

In this gut tension space 2, a gut 3 inserted through a plurality of gut insertion holes formed in the frame 1.
Is extended in the vertical and horizontal directions and stretched to form a ball striking face 4. Further, the bottom portion 1b of the frame 1 is integrally joined with a shaft 7 composed of a grip portion 5 and a throat portion 6 which is bifurcated from the grip portion 5 and extends toward the end. Here, this integral joining is performed by smoothly connecting the respective branch tips of the throat section 6 extending in the end to the bottom section 1b.

In this case, one bridging portion 8 extending substantially in parallel with the bottom portion 1b of the frame 1 is arranged inside the branch throat portion 6, and the central portion of the bridging portion 8 in the longitudinal direction. Further, as shown in the enlarged cross-sectional view of FIG. 2, a plurality of through holes 9 that allow the insertion of the gut are provided. These through holes 9 are formed in the vertical gut 3 a of the gut 3 extending vertically and horizontally.
The extension to the bridging portion 8 is permitted, which preferably functions to make the extension length of the vertical gut 3a located in the central portion of the gut tension space 2 sufficiently long. 2, reference numeral 10 denotes a grommet which is fitted into the through hole 9 and the gut insertion hole of the frame 1 to protect the vertical gut 3a.

Therefore, according to this example, the resilience performance of the ball at the sweet spot of the racket can be effectively improved. Here, in order to make the improvement of the resilience performance sufficiently effective in relation to the spin performance, it is preferable that the number of the vertical gut 3a extending to the bridge portion 8 is 2 to 6. . That is, if it is one, the area of improvement in resilience performance will be too narrow, making it difficult to provide consistently good resilience of the ball, while if it is seven or more, the area of improvement in resilience performance will be too wide. Is usually
The so-called spin region located around the sweet spot becomes too narrow, which causes a problem of reduced spin performance.

By the way, in this example, the ratio a / b of the maximum length a of the vertical gut 3a extending in the frame to the vertical gut length b extending to the bridge portion 8 is in the range of 0.5 to 0.9. Is preferred. In other words, if the ratio a / b exceeds 0.9, it is not possible to expect an effective improvement in resilience performance, and if the ratio a / b is less than 0.5, a racket structure with a shape that does not actually fit (that is, the ball striking face is small turn into).

Further, in this racket, when the conventional repulsion performance and spin performance are expected, none of the vertical gut 3a extends to the bridge portion 8 and all of them are in the gut tension space. It is also possible to extend only to.

FIG. 3 is an enlarged view of a main part showing another embodiment of the present invention. In this example, two bridging parts 11 and 12 are formed in the inside of the branch throat part 6 and the bottom part 1a. They are provided in parallel, and a required number of through holes (not shown) are formed in each of the bridging portions 11 and 12. Here, it is preferable that the distance between the bridge portions 11 and 12 is substantially equal to the distance between the one bridge portion 11 and the bottom portion 1b.

According to this example, in addition to extending the vertical gut 3a to the bottom portion 1b, the bridge portion 11 or 1
It is also possible to extend the length up to 2, or to extend the long length of the vertical gut 3a to a part of the bridging part 11 and the rest to the bridging part 12.
Therefore, here, the degree of freedom in selecting the resilience performance can be greatly increased.

[0018]

As described above, according to the present invention, the rebound performance of the racket can be appropriately adjusted by selecting the extension length of the vertical gut as required.
In addition, by extending multiple vertical guts only in the area corresponding to the central portion of the bridge, the length of the vertical gut is increased in the so-called spin area that is located around the sweet spot. Therefore, the resilience performance can be improved and the spin performance can be sufficiently prevented from being deteriorated. Then, in order to achieve both the resilience performance and the spin performance, the number of through holes provided in the bridge portion should be 2 to 6
This is especially noticeable in the case of books.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an enlarged main part of FIG.

FIG. 3 is an enlarged view of an essential part showing another embodiment.

FIG. 4 is a plan view showing a conventional example.

[Explanation of symbols]

 1 Frame 1a Top part 1b Bottom part 2 Gut tension space 3 Gut 3a Vertical gut 4 Hitting surface 5 Grip part 6 Throat part 7 Shafts 8, 11, 12 Cross-linking part 9 Through hole 10 Grommet

Claims (2)

[Claims] 1. A frame that defines a substantially oval-shaped gut tension space, a gut that is stretched vertically and horizontally in the gut tension space to form a ball striking face, and a shaft integrally joined to the bottom portion of the frame. A racket comprising a grip portion and a throat portion that branches from the grip portion in a bifurcated manner and extends toward the end and is continuous with the frame at the tip, and the shaft of the throat portion At least one bridging portion that extends substantially parallel to the bottom portion of the frame is provided inside, and a plurality of through holes that allow insertion of the vertical gut are provided at the central portion of the bridging portion in the extending direction. racket. 2. The racket according to claim 1, wherein the bridge portion is provided with 2 to 6 through holes.