JPH0140531Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a tennis racket, and its purpose is to prevent tennis elbow by reducing the impact and twist of a ball hit off the sweet spot, and to provide a tennis racket with a good feel when hitting the ball. It's about doing.

In recent years, tennis rackets made of metal or fiber-reinforced synthetic resin have become popular, and the frame and shaft are connected by two shafts that form an inverted triangular space at the base of the frame, which is called an open throat type. This is the configuration that will be used.

Therefore, in such an open throat type tennis racket, when a ball is hit at the center of the ball hitting surface, which is called the sweet spot, the impact at the time of hitting the ball is applied almost evenly to the entire frame and shaft, and the flexure of the gut is large so that the ball bounces off. The grip is exerted to the maximum, and there is almost no shock, and since there is no torque (torsion), the impact on the grip is minimal, and the ball feels good. When the ball is hit from both sides, the gut does not flex and its elasticity decreases, and the frame flexes less, causing strong impact stress to act on the frame. In addition, torque acts on the sides of the frame, and this impact and torque This is transmitted to the grip and can injure the wrist or cause tennis elbow.

Therefore, this invention is intended to eliminate such drawbacks, and two embodiments thereof will be illustrated and explained.

That is, in the first embodiment, in an open-throat type tennis racket, a frame 1 is divided at the center of the lower end to form an arbitrary intermediate part 2, and a core part 3 is bonded to the intermediate part and a frame near the intermediate part. An elastic material 5 is formed with a wing part 4 provided therein, a gut hole 7 corresponding to the gut hole 6 of the frame is provided in the wing part, and a core part 3 is fitted and bonded into the space between them. Reference numeral 4 designates a tennis racket characterized in that it is integrally bonded to a frame, and the elastic material 5 may have a T-shaped cross section, an inverted T-shape, or an H-shape in cross section as shown in the drawings.

In Example 2, as shown in FIG.
Using an inverted T-shaped cross section, the core part 3 is fitted and glued into the gap part 2, the wing part 4 is glued to the lower surface of the frame, and the gourmet 9 with the substrate 8 is inserted into the gut holes 6 and 7 from above. This is a tennis racket with inset reinforcement.

Therefore, when using a racket of this invention with a gut attached, when the ball is hit at the sweet spot, the impact on the grip is less than that of a conventional racket, and a good ball hitting feel that fully utilizes the elasticity of the gut is obtained. It will be done.

When the ball is hit off the sweet spot, the deflection of the gut is similar to that of the conventional model, but in this design the frame 1 is divided at the center of the lower end, so the frame is made of the same material and is not continuous throughout its entire length. In particular, the core part 3 of the elastic material 5 is fitted and adhered to the outer part 2 when the frame is divided and formed, and the wing parts 4 of the elastic material are glued to the frame at both ends of the outer part 2. The impact when the ball is hit is absorbed by the core 3 and the wing parts 4 of the elastic material 5, and torque is generated by the ball, but this is also weakened by the elastic material 5, resulting in the impact and torque being transmitted to the grip. The effect is significantly reduced, reducing the risk of wrist injuries and tennis elbow. Furthermore, if the strength is weak if the frame is only divided at the lower end and joined by the elastic material 5, the glumets 9 having the substrate 8 can be inserted and fixed into the glut holes 6 and 7 as in the second embodiment to reinforce the frame integrally. This can be solved by Although not shown, the substrate 8 may be screwed onto the frame 1.

Thus, this invented racket has a low incidence of injury, and is therefore useful as a racket for women and others with weak grip strength.

[Brief explanation of the drawing]

This figure shows two examples of implementation of this invention. Figure 1 is a plan view using the inverted T-shaped elastic material of Example 1, Figure 2 is an enlarged perspective view of the same main part, and Figure 3 A and B are T-shaped. 4 is an enlarged perspective view of a main part using an H-shaped elastic material, FIG. 4 is an enlarged perspective view of a main part of Example 2, and FIG. 5 is an enlarged perspective view of a member. 1...Frame, 2...Between part, 3...Core part,
4... Wing piece portion, 5... Elastic material, 6, 7... Glut hole, 8... Substrate, 9... Glumet.

Claims (1)

[Claims for Utility Model Registration] 1. In an open throat type tennis racket, the frame is divided at the center of the lower end to form a gap, and the gap and both ends of the frame are bonded together with an inverted T-shaped elastic material. A tennis racket characterized by: 2. The tennis racket according to claim 1, which is a registered utility model, in which a gourmet having a substrate is fixed and reinforced from above an inverted T-shaped elastic material bonded to both ends of the frame in the intermediate portion.