JPS61203985A - Yoke member of racket frame - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a yoke member that is held inside the neck of a racket frame for tennis, badminton, squash, etc., and has a gut insertion hole.

[Conventional technology]

Recent racket frames are increasingly made of metal materials such as steel and aluminum alloy, and high-strength, high-modulus reinforced plastic materials such as glass fiber and carbon fiber. By making a racket frame from these materials, a racket that is lightweight, has excellent strength and durability, and has excellent maneuverability and aesthetics can be obtained. However, when compared to rackets 1- having a wooden frame, such rackets 1~ are insufficient in absorbing vibrations generated during hitting. As a result, when a player uses a racket with a frame made of metal or fiber-reinforced plastic, etc., the player's hands are damaged.

People felt discomfort in their arms, etc., and long-term use could lead to chronic elbow pain (so-called tennis elbow).

Therefore, a means was developed to absorb the vibrations generated during impact. For example, the one described in Japanese Patent Publication No. 52-13455 was developed. This is a vibration damper
It was designed to absorb vibrations using a vibration damper.

[Problem to be solved]

Conventional vibration dampers in which the shaft is provided have a complicated structure, which makes it difficult to adapt to the racket manufacturing process and is impractical. Furthermore, it has not been possible to significantly reduce vibrations transmitted to the grip.

Therefore, the purpose of this invention is to provide a yoke member that not only has the functions of conventional yoke members, that is, retains the string, but also has excellent vibration absorption properties, without complicating the racket manufacturing process. do.

[Means for solving problems]

In order to achieve the above object, the present invention includes a yoke member having a damping part made of a synthetic resin or rubber material having a ti'1l160.05 to 1.00, and a static modulus of elasticity 1.
000 to 50,000 kg, and a strength-retaining portion having a cf.

(Function) According to the present invention, if this yoke member is attached to a frame made of metal or fiber-reinforced plastic,
The vibrations generated during impact are absorbed by the yoke member, and the gut is firmly held.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the yoke member 1 is composed of a damping part 11 and a strength retaining part 12. This yoke member 1 is provided with a large number of gut insertion holes 13. Damping part 1
1 is made of a synthetic resin or rubber material having a tan δ of 0.05 to 1°00.

Strength retention 11ifj12 is a static elastic modulus of 1.000 to 5
It is made from a material with a weight of 0°000 kg, 'cJ.

In the first embodiment shown in FIGS. 1 to 4, two damping portions 11 are inserted on both sides. For the damping part 11, an elastic body is selected that can effectively absorb high frequencies ranging from vibrations on the order of 100 Hz to about 2,000 Hz, which are normally generated when the racket 1 is struck by a pole or the like. , tan δ of frequency 10-2,0OOH7 at temperature 0-40℃
is 0°05 to 1.00, and the static bending modulus is 200 to 1.
5, OOOkg,/cf, more preferably 300~
Materials with a weight of 5°000 kg, 'cJ are preferred. Specific materials for forming the damping portion 11 include thermoplastic elastomers such as urethane, ester, amide, styrene, olefin, and vinyl chloride, and rubber materials include high styrene, SBR, and polynorbornene elastomers. Elastomers, urethane rubbers, butyl rubbers, etc. are suitable.

□The strength retaining portion 12 has a static bending elastic modulus of 1,000 to 60 in order to prevent the yoke member 1 from deforming when the string is attached.
,000 kg/d synthetic resin material is used,
The synthetic resin material is 11 nylon.

It is formed from amide resins such as 6.6 nylon, olefin resins such as polypropylene and polyethylene, styrene resins such as ABS and AE8, ester resins such as polycarbonate and polyethylene terephthalate, and ether resins such as polyacetal.

The yoke member 1 as a multilayer composite structure consisting of the damping part 11 and the strength retaining part 12 has appropriate flexibility, so that the static flexural modulus of elasticity as a structure is 800 within the temperature range of 0 to 40°C. ~50゜000 kg/c+# is desired, more preferably 1.000~35.0
00kg/cJr is good.

In the second embodiment shown in FIGS. 5 to 8, the strength retaining portion 12 has a structure that completely wraps around the damping portion 11, and compared to the yoke member 1 of the first embodiment, the strength retaining portion 12
．． It is difficult for the damping part 11 to peel off.

To form the yoke member 1 of the first embodiment described above, 2
A 2N composite gutter structure can be easily molded by the color injection molding method, and in the second embodiment, the strength retaining part 12 and the damping part 11 are separately injection molded, and the mold e compression molded rubber is used. It can also be molded by gluing the materials together. In addition, when molding, fillers such as glass and carbon fiber, weather resistance improvers, 11
1 can be mixed with molding agents, plasticizers, etc., and of course it is also possible to add a coloring agent for desired coloring.

-〇- As the material constituting the strength retaining portion 12, a material having physical properties as shown in Table 1 is used, and as the material constituting the damping portion 11, a material having physical properties as shown in Table 2 is used. used. The yoke member 1 was constructed by combining various materials, as shown in Table 3. Table 3 shows the yoke of the structure of the first embodiment, and the fourth
The table shows the yoke member of the second embodiment. In Tables 3 and 4, single-layer yoke members made of N004 material shown in Table 1 are given 5 points, those that are better than this are added to the 5 points, and those that are inferior are subtracted. Table 3 and 4
Shown in the table. Furthermore, Table 5 shows the evaluation when the yoke member was made of a single layer.

Table 1 Table 2 Table 10 - Table 3 Table 4 Table 5 [Effects] As explained above, according to the present invention, the yoke member is not a single layer but has a tan of 60.05 to 1.00. It consists of a damping part made of synthetic resin and a rubber material and a strength-retaining part with a static modulus of elasticity of 1,000 to 50,000 ks%, so it is made of a single layer as shown in Table 5. It also has superior vibration absorption properties and improved feel when hit. Further, according to the present invention, there is no need to change the manufacturing process of the racket to a Wt aperture, and the conventional grip holding function is not impaired.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional front view showing a first embodiment of the present invention;
Figure 2 is a sectional view taken along line II-IF in Figure 1, Figure 3 is a plan view,
4 is a bottom view, FIG. 5 is a half-sectional front view showing the second embodiment of the invention, FIG. 6 is a sectional view taken along the line VI-VI in FIG.
FIG. 7 is a plan view, FIG. 8 is a bottom view of the right half section, and FIG. 9 is a front view showing the entire racket. 1... Yoke member, 11... Damping part, 12... Strength retaining part, 13... Gut insertion hole. Applicant Brideston Co., Ltd. Agent Patent Attorney Masu 1) Takefuji Figure 5 Figure 6 Figure 7 Figure 9

Claims (1)

[Claims] 1. A yoke member having a gut insertion hole bored inside the neck of the racket frame, and having a tan δ0.
Damping part made of synthetic resin or rubber material with a static elastic modulus of 1,000 to 50,000
A yoke member for a racket frame, comprising a strength retaining portion having a strength of kg/cm^2.