JPS6031736Y2 - grip for racket - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the grip of a metal racket frame.

Conventionally, it has been difficult to control the weight of metal racket frames compared to wooden rackets or FRP rackets, so various grip materials have been devised to reduce the weight. Due to the impact stress caused by the impact at the time, the gap between the frame member and the plastic grip material may cause strange sounds, and the material is hard, so it has poor vibration absorption properties and is prone to tennis elbow. Ta.

Therefore, as shown in FIGS. 2 and 3, a foamed synthetic resin core material 4 with a very large expansion ratio is placed between the frame members 3.
A metal racket in which a grip 5 is formed by injecting foamed synthetic resin around the grip 5 is known.

However, in these known racket grips,
The foaming ratio of the foamed synthetic resin core material 4 interposed between the frame members must be selected appropriately. For example, if a foamed synthetic resin core material with a very high foaming ratio is used, the foamed synthetic resin may be injected. When molded, the foamed synthetic resin may partially penetrate into the foamed synthetic resin core material, increasing the weight, or even if there is no problem during molding, the frame may deteriorate during long-term use. It also has drawbacks such as the air bubbles in the foamed synthetic resin interposed between the members are crushed and contracted, causing the grip member itself to cave in as shown in Figure 4, making it unable to function as a grip. Ta.

In view of these conventional drawbacks, the present invention enables more reliable weight adjustment of the metal racket frame, improves vibration damping performance when hitting the ball, prevents tennis elbow, and provides a durable grip. It was done for a purpose.

An embodiment of the present invention will be described based on the drawings. As shown in FIGS. 5 and 8, a metal racket frame is formed by bending and molding a metal frame member to form a ball hitting portion, a shaft portion, and a grip portion. , opposing frame members 6 of the grip portion of the metal racket frame
Fitting or pasting a band-shaped adhesive member 8 into the gap 7 between the
Further, an end insertion member 10 is inserted into the grip end 9 of the frame member 6, and a foamed synthetic resin is injected around the grip portion of the frame member 6 to form a foamed synthetic resin grip 12. This is a grip for rackets.

In the grip of the present invention, the belt-shaped adhesive member 8 is fitted or pasted into the gap 7 between the frame members 6, and the end insertion member 10 is inserted into the grip end 9. As the adhesive member 8, a lightweight thin plate such as a fiber-reinforced plastic board (carbon fiber-reinforced plastic board, glass fiber-reinforced plastic board, etc.), vulcanized fiber board, phenol resin board, other synthetic resin board, or balsa wood can be used. , and by appropriately selecting a material with high rigidity, the weight management of the metal racket frame becomes much better than in the past.

For example, carbon fiber reinforced plastic board (CF
If you use RP board (abbreviated as RP board), you can use a board with a thickness of about 0.1 to 0.2 mm, which makes it lighter than the conventional foamed synthetic resin core material, and the rigidity of CFRP board is extremely high. Because of its high grip shape, the air bubbles are not crushed and contracted after the grip is molded, unlike conventional foamed synthetic resins, which causes the grip member to swivel and collapse, resulting in extremely improved durability.

Furthermore, by using a CFRP board as the strip-shaped adhesive member 8, and by using a urethane elastomer resin as the foamed synthetic resin, the vibration damping properties, which are also characteristics of the CFRP board, can be improved compared to the foamed synthetic resin that is the grip member. This becomes even more pronounced due to the synergistic effect of the above, so the grip member absorbs the impact when hitting the ball, which is highly effective in preventing tennis elbow.

Further, the shape of the band-shaped adhesive member 8 used in the grip of the present invention is such that a projecting piece 8' is formed so as to fit into the gap 7 between the frame members 6, as shown in FIG. This prevents the foamed synthetic resin from flowing into the cavity 13 when the foamed synthetic resin is injected, making it possible to ensure weight adjustment. ,
This makes it possible to make delicate weight adjustments, increasing the degree of freedom in weight adjustment.

As another embodiment of the band-shaped adhesive member 8 for the grip of the present invention, it is also possible to insert it into the side surface 11 of a frame member, as shown in FIG.

Moreover, as shown in FIG. 9, it can also be used in the form of a thin plate.

Furthermore, as shown in FIG. 7, since the end insertion member 10 is inserted into the grip end 9 of the frame member 6, it is possible to prevent the foamed synthetic resin from flowing into the cavity 13. Adjustment will be ensured.

The terminal insertion member 10 may be made of cork or lightweight resin having a shape that matches the cross-sectional shape of the frame as shown in the figure, or may be a piece of cork,
Workability is improved because cotton-like materials, putty, etc. can be inserted.

Thus, the racket grip according to the present invention has unprecedented features and is advantageous.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a racket, Fig. 2 is a cross-sectional perspective view of a main part showing a state in which a foamed synthetic resin core material is inserted into the grip of a conventionally known metal racket, and Figs. 3 and 4 are conventional 5 and 6 are perspective views showing a fitted state of the band-shaped adhesive member according to the present invention, and FIG. 7 shows an embodiment of the end insertion member. The perspective view, FIG. 8, and FIG. 9 are sectional views of the grip portion showing a state in which the grip member is formed. 1...Racket frame, 2...Grip part, 3...Frame member, 4...
Foamed synthetic resin core material, 5...Grip, 6...
... Frame member, 7... Gap part, 8...
...Band-shaped adhesive member, 8'...Protruding piece, 9...
...Grip end part, 10... End insertion member, 11... Side part, 12... Foamed synthetic resin grip, 13... Empty Torso.

Claims (1)

[Claims for Utility Model Registration] 1. In a metal racket frame in which a ball hitting surface portion, a shaft portion, and a grip portion are formed by bending a metal frame member, the grip portions of the metal racket frame face each other. Fit or adhere the gap between the frame members with a band-shaped adhesive member, insert the end insertion member into the grip end of the frame member, and inject foamed synthetic resin around the grip portion of the frame member. A racket grip characterized by having a foamed synthetic resin grip formed by injection. 2. The racket grip according to claim 1, wherein the band-shaped adhesive member has a protrusion that fits into a gap between frame members.