JP2000176053A - Racket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a racket that improves in plane stability and impact resilience by a normal shape and appearance and with no redundant weights mounted on the face. SOLUTION: A face portion 2 has a multitude of gut insertion holes 6 connecting the external and internal surfaces, and has weight members 13 fitted in wide portions 7a of an external groove 7. Each weight member 13 is fitted in its linear recess 13b with a gut protection member 11 and in its holes 13a with grommets 11a, which are also inserted in the holes 6. Ordinary gut protection members 10 and 12 are fitted in the other portions of the groove 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a racket, and more particularly to a racket suitable for tennis.

[0002]

2. Description of the Related Art In a tennis racket, a gut is stretched on a face portion via an additional member such as a grommet, a bumper or a bumper grommet. Grommet is a gut (string) provided on the face
Is a cylindrical member inserted into the insertion hole, and a gut is inserted into the inner hole. The bumper is a member arranged on the outer periphery of the face portion, and the bumper grommet is a member in which the bumper and the grommet are integrated.

Conventionally, these grommets, bumpers or bumper grommets are made of a polymer material such as nylon having a specific gravity of about 1 (the same specific gravity as FRP constituting the racket frame).

By the way, in order to increase the surface stability and resilience at the time of hitting a ball, lead tape is attached to the face side or the face top, and Japanese Unexamined Utility Model Publication No. 60-168856 and Japanese Unexamined Utility Model Publication No. 63-96856. As described above, the weight-added part may be attached to the face portion, or the face portion may be partially thickened or formed to have a shape bulging outward. It is also known to insert a metal into the face part to partially increase the weight, as in Japanese Utility Model Laid-Open No. 61-174964.

Japanese Utility Model Laid-Open No. 2-139667 discloses a racket using a gut protective member made of a synthetic resin containing tungsten or the like and having a specific gravity of 1.5 or more.

[0006]

When lead tapes or weight-added parts are attached to the face, they may come off during play, and the aesthetic appearance of the racket is impaired. There is also a problem that the weight-added parts are easily damaged by hitting the coat surface.

Also, when the weight-added parts are bulky,
Air resistance during swing increases, making it difficult to swing.

[0008] Even when the thickness of the face portion is partially increased or the face portion is partially bulged, the air resistance at the time of swing is similarly increased, and it is difficult to swing out. In addition, the shape has a strange feeling and is inferior in beauty. Further, when the face portion is partially deformed as described above, F
In the case of a racket made of RP, the fiber orientation is disturbed, and the strength tends to decrease.

[0009] When a metal material is inserted, the fiber orientation is similarly disturbed, and the strength tends to decrease. When the face part is partially deformed or a metal material is inserted, a concentrated portion of stress is generated or a rigidity distribution is unbalanced.

Since the synthetic resin containing tungsten or the like is brittle, such a synthetic resin gut protection member is liable to crack when subjected to a stress such as an impact from a gut, and has poor durability.

The present invention solves the above-mentioned problems of the prior art and provides a racket with improved surface stability or resilience while maintaining a normal shape and appearance without attaching unnecessary heavy objects to the face portion. The purpose is to do. Also,
An object of the present invention is to provide a racket provided with a weight member having excellent durability.

[0012]

SUMMARY OF THE INVENTION A racket according to the present invention has a gut protection member and a weight member provided on a face portion thereof, and the gut protection member holds down a weight member made of a high specific gravity material having a specific gravity of 1.5 or more. And attached to the face portion.

In such a racket, the weight member is added to the face portion by pressing the weight member by a gut protection member which is usually necessarily mounted on the racket, so that the external appearance is the same as the conventional one. While
Surface stability or resilience at the time of a ball hit is improved.
Further, since the weight member is pressed down by the gut protection member, the weight member is protected by the gut protection member, and the durability of the weight member is improved.

In the present invention, it is preferable that a concave portion is provided on the inner peripheral surface or the outer peripheral surface of the face portion, and the weight member is disposed in the concave portion so as not to protrude from the concave portion. It is also preferable to cover the weight member with a gut protection member.

When the weight member made of such a high specific gravity material is disposed on the face side portion, the surface stability and spin imparting property at the time of hitting the ball and the ball controllability are improved. When this weight member is arranged on the face top portion, the moment of inertia increases, and the resilience improves.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view of a tennis racket according to an embodiment, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, FIG. 3 is an exploded perspective view, and FIG. 4 is a perspective view of a gut protection member and a weight member. is there.

The tennis racket 1 has a face 2, a shaft 3 and a grip 4, and the face 2 is gutted.

The face portion 2 is provided with a large number of gut insertion holes 6 communicating the outer peripheral side and the inner peripheral side. Grooves 7 extend in the circumferential direction on the outer peripheral surface of the face portion 2, and gut protection members 10, 11, 12 are mounted so as to engage with the grooves 7.

The gut protection member 10 is disposed on the face top side, the gut protection member 11 is disposed on both face side portions, and the gut protection member 12 is disposed near the bottom of the face portion. Each gut protection member 10,
11 and 12 are grommets 10a, 11a and 12a inserted into the gut insertion holes 6, and the band portions 10b, 11b and 12b.
Through the structure.

The gut protection member 11 is provided with a narrow groove 11c as shown in FIG.

The groove 7 is a wide groove 7a on both sides of the face portion 2, and the weight member 13 is fitted in the wide groove 7a. The weight member 13 has a band shape, and a band portion 11b of the gut protection member 11 is provided on the outer surface side.
Are provided. The weight member 13 has a hole 13 through which the grommet 11a is inserted.
a is provided.

The weight member 13 and the gut protection member 11 are arranged on both face side portions while the grommet 11a is inserted through the hole 13a, and each grommet 11a is inserted into the hole 6 of the face portion 2. The weight member 13 is provided so as not to protrude from the groove 7 so as to be flush with the outer peripheral surface of the face portion or to be retracted into the groove 7 more than that (preferably 0.5 mm or more, particularly 0.8 mm or more). Can be
This gut protection member 11 and each gut protection member 10, 1
A gut is stretched through the grommet of the second grommet 10a, 11a, 12a.

The gut protection members 10, 11, 12
Is made of a synthetic resin having a specific gravity of about 1 (usually 1.3 or less) as in the prior art.

The weight member 13 has a high specific gravity made of a composite material of fine particles of a metal having a high specific gravity such as tungsten and a synthetic resin. A tennis racket in which such weight members 13 are arranged on both side portions is excellent in surface stability at the time of hitting a ball, spin imparting properties, ball control properties, and the like.
Further, since the weight member 13 is pressed from the outside by the gut protection member 11, the weight member 13 is protected by the gut protection member 11, and the durability of the weight member 13 is good.

In this embodiment, a wide portion 7a is provided in the groove 7, the weight member 13 is engaged with the wide portion 7a, and the gut protection member 11 is engaged with the concave ridge 13b of the weight member 13. Therefore, the weight member 13 and the gut protection member 11 do not protrude from the outer surface of the face portion 2.

The gut protection members 10 and 12 are of a known shape conventionally used for a tennis racket, and the tennis racket 1 has an appearance similar to that of a known tennis racket as a whole. There is no discomfort at all.
In addition, the face portion 2 does not have a locally thick portion or a locally bulged portion, there is no unevenness in rigidity distribution, and there is little air resistance during swing. Furthermore, when this tennis racket is made of FRP, the orientation of the reinforcing fibers is not disturbed at the time of manufacture, and the strength is sufficiently high.

In the present invention, the material constituting the gut protection member and the weight member is, for example, 11 nylon,
6.6 Resin materials such as amide resins such as nylon, olefin resins such as polypropylene and polyethylene, styrene resins such as ABS and AES, ester resins such as polycarbonate and polyethylene terephthalate, and ether resins such as polyacetal or urethane resins. An amide-based or styrene-based elastomer material can be used, and among these, a nylon material is preferable. In order to increase the specific gravity of the resin or elastomer material used for the weight member 13, tungsten, lead, gold, silver, copper, titanium,
It is preferable to add high specific gravity metal particles such as stainless steel.

The specific gravity of the weight member 13 is 1.5 to 13
Is preferred, and particularly preferably 4 to 10, particularly preferably 6 to 8.

In the above-described embodiment, the weight members 13 are exposed on both sides of the gut protection member 11, but the cover protrudes to both sides like the gut protection member 11A shown in FIGS. A gut protection member provided with the portion 11d may be used. With the gut protection member 12A having the cover portion 11d, the weight member 13 does not directly contact the coat surface or the like even when the coat surface or the like is hit with the face portion 2, and the weight member 13 The durability becomes higher.

In FIG. 6, a thin synthetic resin sheet 15 is interposed between the weight member 13 and the bottom of the groove 7. By using the sheet 15, the weight member 13 is protected from external force, and the weight member 13 is stably arranged in the groove 7, so that the minute vibration at the time of hitting the ball can be removed.

In the above embodiment, the weight members 13 are arranged on both side portions of the face portion. However, the weight members may be arranged on the face top side. When the weight member is arranged on the face top portion, the moment of inertia increases, and the resilience of the racket 1 at the time of hitting the ball improves.

The weight member 1 is attached to the face side of the face.
When arranging the 3, arrangement range L ₂ of the weight member 13 is preferably a racket length axial length 20-40%, especially 25% to 35% in the range of L ₁ between the face portion.

[0033]

As described above, according to the present invention, it is possible to adjust the weight distribution as desired while maintaining the same appearance and shape as before, and the surface stability, spin imparting property, ball control property, and resilience are obtained. A racket with improved characteristics such as racket operability is provided. The racket provided by the present invention has good durability of weight members,
The weight member does not come off the racket during play.
In addition, this racket has low air resistance during swing.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an exploded perspective view of the tennis racket according to the embodiment.

FIG. 4 is a perspective view of a weight member and a gut protection member.

FIG. 5 is a cross-sectional view of a racket according to another embodiment.

FIG. 6 is a cross-sectional view of a racket according to still another embodiment.

7 (a) is a front view, FIG. 7 (b) is a side view, FIG. 7 (c) is a bottom view, and FIG. b) It is an expanded sectional view which follows the DD line of a figure.

[Explanation of symbols]

 Reference Signs List 1 tennis racket 2 face portion 6 gut insertion hole 7 groove 7a wide portion 10, 11, 12 gut 10a, 11a, 12a grommet 10b, 11b, 12b band portion 13 weight member 13a hole 13b concave strip 15 synthetic resin sheet

Claims (5)

[Claims] In a racket provided with a gut protection member and a weight member on a face portion, a weight member made of a high specific gravity material having a specific gravity of 1.5 or more is pressed by the gut protection member and attached to the face portion. Racket to feature. 2. The racket according to claim 1, wherein a concave portion is provided on a peripheral surface of the face portion, and the weight member is arranged so as not to protrude from the concave portion. 3. The racket according to claim 1, wherein the weight member is covered by the gut protection member. 4. The racket according to claim 1, wherein the gut protection members are arranged on both side portions of the face portion. 5. The racket according to claim 1, wherein the high specific gravity material is a metal / synthetic resin composite material having a specific gravity of 2 to 13.