JPH0975479A - Tennis racket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tennis racket for a beginner or the like to easily hit a ball with a sweet spot. SOLUTION: A tennis racket 1 is formed out of a face 2, a shaft 3 and a grip 4. Regarding the face 2, the position T of maximum face thickness is nearer the grip 4 than the position W of maximum face width. Also, the face 2 is formed to be longer in the lengthwise direction to a certain extent. Regarding the axial length A of the face 2 at the maximum thickness part, the value of A/L × 100 is taken between 25% and 75%, in particular between 35% and 65%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tennis racket, and more particularly to a tennis racket suitable for beginners and weak players.

[0002]

2. Description of the Related Art As is well known, a tennis racket includes a face to which a gut is stretched, a grip to be gripped by a player, and a shaft connecting these.

In the conventional tennis racket, the length from the grip end (the end of the grip) to the face top (the tip of the face) is about 670 to 690 mm.

The shape of the face is almost oval, and therefore, the position of the maximum width of the face on the major axis of the racket is near the midpoint of the face length. The frame thickness in the direction perpendicular to the ball striking face of the face (this frame thickness is referred to as "back width") is 17 to 20 mm.
It has become about. The weight of the tennis racket (excluding the weight of the gut) is about 300 to 350 g.

By the way, as a result of various studies, the hitting point (the center position of the ball on the face surface at the time of a ball hit) for intermediate and advanced players is almost constant, and it is located at the center of the face surface or near the face top. On the other hand, in the case of beginners and inexperienced players, it is recognized that these hit points are distributed over a wide range of the face surface, and on average, they are biased toward the grip side rather than the center of the face surface. It was

Since the hitting point is biased toward the grip side rather than the center of the face in this way, in combination with the fact that the rebound of the face at the time of a ball hit is poor and the swing speed is small, the hitting ball of a beginner or a weak player is hit. Was inferior in speed and was so-called "not touching the core of the face".

Japanese Utility Model Publication No. 4-29621 and 4-29.
Japanese Patent No. 624 describes a tennis racket in which the maximum thickness of the frame is arranged between the maximum width portion of the face and the grip side end portion of the face, and the center of gravity is shifted toward the grip side from the maximum width position of the frame. ing.

[0008]

[Problems to be Solved by the Invention] Actual fairness 4-29621
In the tennis rackets described in Japanese Patent Publication No. 4-29624 and Japanese Patent Publication No. 4-29624, the maximum thickness does not extend along the face and is merely one point, so that the sweet spot is in the longitudinal direction of the tennis racket. There was a problem that needs to be improved, which is a narrow one concentrated around the maximum thickness.

It is an object of the present invention to provide a tennis racket in which a beginner or the like can easily hit the ball in a relatively large sweet area as compared with a conventional racket.

[0010]

A tennis racket according to claim 1, wherein the maximum thickness portion of the face on the major axis of the racket is between the maximum width position of the face and the end of the face on the grip side. The thickest portion is the one that extends the required length along the face.

In the tennis racket of the present invention, since the position of the maximum face thickness is closer to the grip than the maximum width position of the face and is extended to some extent, the sweet spot is widened in the longitudinal direction of the face. The sweet spot of the tennis racket matches the hitting points of beginners and weak players with high frequency, and it is possible to obtain efficient repulsion (so-called core repulsion) for beginners and weak players.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a tennis racket (however, a racket frame before putting a gut) according to the embodiment, and FIG. 2 is a side view thereof.

The tennis racket 1 comprises a face 2, a shaft 3 and a grip 4. The face 2 has a grip 4 in which the face maximum thickness portion T is larger than the maximum width position W.
It is on the side and extends to some extent along the face in the longitudinal direction of the face.

The thickness of this face 2 is 1 over the entire area.
It is 4 mm or more (preferably 20 to 50 mm), and the thickness in the face maximum thickness portion T is the maximum in the entire racket frame. This maximum thickness T
The thickness t is preferably 20 to 50 mm, more preferably 25 to 40 mm.

From the maximum thickness portion T to the face top and the grip side end portion of the face, it is preferable that the thickness of the face is gradually reduced as shown in FIG. In this case, the thickness t of the maximum thickness portion is preferably 1.2 to 3.5 times the thickness of the face top. More preferably, it is 1.4 to 2.0 times.

In the present invention, as shown in FIG. 2, it is preferable that the thickness of the shaft 3 is gradually reduced from the maximum thickness portion T to the upper end of the grip 4. By doing so, the rigidity of the shaft 3 portion becomes high, the energy loss at the time of hitting the ball is extremely reduced, and high repulsion can be obtained.

In the present invention, the racket length of the tennis racket is preferably 670 to 690 mm. Further, the axial length of the face is preferably 300 to 360 mm. The axial length L from the grip side end of the face to the maximum width position W of the face is 150 to 180 m.
In particular, it is preferably 160 to 170 mm.

The axial length A of the maximum thickness portion is A / L × 1
It is preferable that the value of 00% is 25 to 75%, especially 35 to 65%. It is preferable that the length B from the upper end of the maximum thickness portion T to the maximum width position W has a value of B / L × 100% of 10 to 40%, particularly 15 to 25%, and particularly about 18%. .

The length C from the lower end of the maximum thickness portion T to the grip side end of the face is C / L × 100% of 10
It is preferably 40%, especially 15-25%, especially about 18%.

The length S of the shaft 3 portion is preferably 40 to 60%, particularly 45 to 55% of the axial length of the face.

A tennis racket 1 constructed in this way
Is located closer to the grip than the maximum width position of the face, and the sweet area is distributed longer in the axial direction of the racket, so that the hitting point of a beginner or a weak player matches the sweet area well. Therefore, it is possible to obtain efficient repulsion for beginners and weak players.

In this tennis racket 1, since the maximum thickness portions are arranged on both sides of the hitting point for a beginner, the sweet area in the face width direction is wide.

By setting the length of the tennis racket 1 to be 670 to 690 mm, which is the same as the conventional one, it is possible to eliminate disadvantages and discomfort in serve and the like.

Conventionally, the grip handle is molded and added to the racket frame with polyurethane or the like, but if this is continuously molded integrally with the racket frame, the weight is further reduced and the center of gravity is the maximum face width. It is very preferable because it approaches the position.

In the present invention, it is preferable that the weight (removed gut weight) of the tennis racket is 300 g or less so that it is lightweight and easy to operate.

The center of gravity of the tennis racket 1 is preferably set so as to be in the region of the maximum thickness portion T or between this region and the yoke portion (portion of region C in FIG. 2). Particularly, when the center of gravity exists in the region of the maximum thickness portion T, good ball resilience can be obtained.

The center of gravity is set (moved) by, for example, forming a part of the frame into a thick tubular part or forming a part of the frame by mixing a fiber-reinforced synthetic resin with a heavy material (metal powder or the like). Or, it can be achieved by means such as using a heavy grommet part.

The tennis racket of the present invention is preferably made of fiber reinforced synthetic resin, but may be made of lightweight metal (for example, aluminum, aluminum alloy, etc.).

As the synthetic resin, epoxy resin, nylon and the like are preferable, but epoxy resin is preferable in terms of strength, durability and cost.

As the reinforcing fiber, carbon fiber, boron fiber, alumina fiber, ultrafine iron wire, Ti-Si-C-
O-based fibers (trade name Tyranno fiber), aromatic polyamide fibers, aromatic polyester fibers, ultra-high molecular weight polyethylene fibers, and the like can be used, but carbon fibers are preferable in terms of cost.

[0031]

EFFECTS OF THE INVENTION For players who do not hard swing a racket, such as beginners and inexperienced players, the hitting point is in
Although it is closer to the grip than advanced players, the tennis racket of the present invention sets the maximum face thickness part according to such player's playing style and hitting position, so that even a beginner or a weak player This makes it easier to catch the ball with the core, and you will be able to enjoy playing tennis.

[Brief description of drawings]

FIG. 1 is a front view of a tennis racket according to an embodiment.

FIG. 2 is a side view of the tennis racket according to the embodiment.

[Explanation of symbols]

 1 Tennis racket 2 Face 3 Shaft 4 Grip

Claims (4)

[Claims] 1. A tennis racket in which the maximum face thickness portion on the long axis of the racket is between the maximum face width position and the end portion on the grip side of the face, the maximum thickness portion is the required length along the face. An extended tennis racket. 2. When the distance between the face maximum width position and the grip side end of the face is L, the percentage A / L of the face axial lengths A and L of the face maximum thickness portion. A tennis racket characterized in that x100 is 25 to 75%. 3. The tennis racket according to claim 2, wherein a percentage B / L × 100 of the face axial lengths B and L from the maximum thickness portion to the face maximum width position is 10 to 40%. . 4. The percentage C / L × 100 of the axial lengths C and L from the grip-side end of the face to the maximum thickness portion is 10 to 40%. A characteristic tennis racket.