JPH0715065U - Racket gut protector - Google Patents

Abstract

(57) [Summary] [Purpose] Easy to bend according to the angle of the gut insertion hole,
Moreover, a gut protector having appropriate rigidity and easy to insert is provided. [Structure] In a gut protector to be mounted on a racket frame, in which a gut insertion hole of a hitting portion of a racket frame is bored from an outer peripheral side center to an inner peripheral side off center, a protector covering a frame outer peripheral surface. Is formed of a nylon resin having an elastic modulus of 6000 to 15000 kg / cm ² (at equilibrium water content), and a cylindrical body inserted into the gut insertion hole by being inserted into the hole provided in the protective body is connected. The gut sleeve part has a two-kind structure formed of a nylon resin having an elastic modulus of 3000 to 6000 kg / cm ² (at equilibrium water content).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a racket frame made of metal or fiber reinforced resin, in which a gut insertion hole for gut tension is located at a central portion on the outer peripheral surface side (hereinafter referred to as center) having a thickness in a direction perpendicular to the gut mesh surface of the frame. To a gut protector for mounting in the gut insertion hole of a racket frame drilled toward a position not on the same plane as the gut net surface on the inner peripheral surface side (hereinafter referred to as "off center"). Is.

[0002]

[Prior art]

Since the racket frame can be molded with fiber reinforced resin, it is larger than the conventional regular size (mesh surface area is 452 cm ² ) racket frame, so-called semi mirror size or large size (mesh surface area is 548 cm 2 ² or more), and moreover, oversized racket frames (net area of 100 cm ² or more) have become the mainstream. Further, the gut protector is usually formed of a nylon resin having an elastic modulus of 6000 to 15000 kg / cm ² (at equilibrium water content). By increasing the area of these nets, it is possible to increase the tension of the gut by applying less load to the frame that has become easier to bend, and also to generate the gut by repeatedly using the racket. As shown in Fig. 4, a gut insertion hole is drilled from the outer center of the frame to the off center of the inner surface as a method to minimize the loosening of the frame and prevent the frame from collapsing or breaking. The racket frame was invented.

When the racket frame having the above structure is fitted with a gut protector in which the conventional elastic modulus is 6000 to 15000 kg / cm ² and the cylindrical body is perpendicular to the base body and is erected in the same row, Since the elastic modulus is large, when the tubular portion is fitted and inserted along with the drilling angle of the gut insertion hole, the base portion is twisted and cannot follow the outer peripheral surface of the frame, and is lifted. Therefore, as a gut protector that can be easily attached to the racket frame having the gut insertion hole as described above, the present inventors have shown that the tubular body has an angle of 90 degrees or less with respect to the base body as shown in FIG. As shown in FIG. 5, a gut protector arranged in parallel, or a gut having a structure in which the upper layer of the strip-shaped substrate is formed of a hard material and the lower layer of the strip-shaped substrate is formed of a soft material and the tubular portion is continuously formed integrally therewith. We have devised a device that forms a protective body and uses the properties of a soft material so that the racket frame can be mounted according to the angle of the insertion hole.

[0004]

[Problems to be solved by the device]

 The conventional gut protector described above has the following problems. That is, the gut protector having a configuration in which the tubular bodies shown in FIG. 6 are arranged side by side with respect to the strip-shaped substrate at an angle of 90 degrees or less requires that precise dimensions are required for molding. Since the standing angle of the tubular body is 90 degrees or less, there is a drawback that it takes time and effort to attach the frame to the gut insertion hole. In addition, the two-layer structure shown in FIG. 5 has a drawback that the weight is increased because the two layers are integrally molded over the entire structure. Therefore, the present invention has been made under the above circumstances, and the purpose thereof is that the gut insertion hole is located from the center position on the outer peripheral surface side of the frame to the off center position on the inner peripheral surface side. An object of the present invention is to provide a gut protector suitable for a racket frame having a configuration drilled toward the front.

[0005]

[Means for Solving the Problems]

In order to achieve the above object, the gut protective body of the present invention is not on the same plane as the gut net surface on the inner peripheral surface side from the outer peripheral surface side central portion of the thickness in the direction orthogonal to the gut net surface of the frame. In a gut protective body mounted on a racket frame having a gut insertion hole drilled toward the position, the gut protective body is provided with a hole that matches the outer peripheral surface side opening of the gut insertion hole. A gut sleeve, in which a tubular body is connected to a protective body composed of a band portion and ears provided at both ends in the width direction of the band portion by a band-shaped base body so as to match the holes of the protective body. A cylindrical body is inserted into a hole of the protective body, the protective body is made of nylon resin having an elastic modulus of 6000 to 15000 kg / cm ² (at equilibrium water content), and the gut sleeve is made of elastic material. Rate 3000-6000kg / cm ² (equilibrium water content Hour) nylon resin.

In addition to the gut protector of the present invention having only the above configuration, the gut insertion hole of the hitting portion of the racket frame is drilled from the outer peripheral side center toward the inner peripheral side off center. The elastic modulus of 6000 to 15000 kg / cm ² (equilibrium moisture content) is suitable for mounting on the racket frame consisting of the installed part and the part drilled so as to be on the same plane as the gut net surface. H) and a gut sleeve made of nylon resin with an elastic modulus of 3000 to 6000 kg / cm ² (at equilibrium water content) and the elastic modulus of 6000 to 15000 kg It is also possible to make a gut protector consisting of a part in which the protector part and the tubular part are integrally formed with nylon resin of / cm ² (at equilibrium water content).

The material for forming the gut protector of the present invention may be any resin as long as it is a resin within the numerical range of the elastic modulus, but the injection moldability is good, and the rigidity, elongation and weather resistance are good. In this respect, it is preferable that the gut is made of a nylon resin in many cases, and therefore, the gut is preferably made of a nylon resin. If the elastic modulus of the material forming the protective body is smaller than the above range, the ears may float from the frame when the gut is stretched.In such a case, when the racket is used, it may not contact the ground. If they come in contact with each other, foreign matter may get into the floating place, so they do not serve to protect the frame. If the elastic modulus is larger than the above range, the gut may be cracked at the part corresponding to the gut insertion hole in which the gut is double stretched or at the part connecting the gut, which is not preferable. The elastic modulus of the material forming the gut sleeve is easy to bend according to the angle of the gut insertion hole and has an appropriate rigidity for easy insertion, and the most gut stress is applied when the gut is stretched. The above range is preferable so that the end portion of the inner peripheral surface of the cylindrical body that appears at the off-center position is not damaged.

[0008]

[Action]

As described above, the gut protector of the present invention is provided on the protector by covering the outer peripheral surface of the frame with a nylon resin having an elastic modulus of 6000 to 15000 kg / cm ² (at equilibrium water content). The gut sleeve part, which is inserted into the hole and connected to the gut insertion hole, is connected to the gut sleeve part. It has a two-kind structure made of nylon resin with an elastic modulus of 3000 to 6000 kg / cm ² (at equilibrium water content). Therefore, no matter what angle the gut insertion hole is bored with respect to the net surface, it is possible to change the standing angle of the cylindrical body forming the grommet portion with respect to the base body. The gut sleeve made of a material with a smaller elastic modulus than the guard is inserted into the required part of the gut protector in advance, and the other parts are integrally molded with the protector and the cylinder. As a result, it is easy to attach the racket to the racket frame and the weight increase of the racket can be minimized. In addition, since the gut that transmits the vibration when hitting the ball with the gut directly to the frame is supported by the tubular part made of soft material, the vibration damping effect is enhanced and the frame part is protected by the gut from the impact from the gut. Can be protected.

[0009]

【Example】

 Hereinafter, the present invention will be described with reference to the illustrated embodiments. In the figure, the same numbers are used for the same parts as the conventional ones. 1 to 3 show an embodiment of the gut protector of the present invention, FIG. 1 is a perspective view of the gut protector 1 of this embodiment, and FIG. It is explanatory drawing showing the principal part cross-section structure in the state mounted | worn with the racket frame 8 suitable for mounting the invention's gut protective body. FIG. 3 is a sectional explanatory view showing another embodiment. The gut protector 1 of the present embodiment has a band portion 4 provided with a hole 13 that matches the opening a on the outer peripheral surface 9 side of the gut insertion hole 11 of the racket frame, and ears provided at both ends in the width direction thereof. A gut sleeve 5 including a protective body 2 including a portion 3, a tubular body 6 that is inserted into the gut insertion hole 11 by being inserted into the hole 13 of the protective body 2, and a strip-shaped base body 7 that connects the tubular body 6. It is composed of.

A material for forming the protective body 2 is a nylon resin having an elastic modulus of 6000 to 15000 kg / cm ² , and a material for forming the gut sleeve 5 is a nylon resin having 3,000 to 600,000 kg / cm ^2. Is. FIG. 2 shows an example in which the gut protector 1 of this embodiment is mounted on a racket frame 8 suitable for mounting the gut protector of the present invention. In the racket frame 8, the gut insertion hole 11 is drilled from the center M on the frame outer peripheral surface 9 side to the position off the center M on the inner peripheral surface 10 side, that is, toward the off center. When the gut protector 1 of the present invention is mounted on the racket frame 8 having the above-described structure, the cylinder body 6 which is a portion to be inserted into the gut insertion hole 11 is formed of a material having a small elastic modulus. The angle of the body 6 can be freely changed, and the wearing becomes easy.

The gut protector of the present invention is a gut protector having only the part having the structure of the present invention, and, for example, as shown in FIG. , a gut sleeve 5 formed of an elastic modulus 6000~15000kg / cm ² nylon resin protection member 2 and the elastic modulus was formed by nylon resin (at equilibrium moisture content) 3000~6000kg / cm ² (at equilibrium moisture content) The part of the racket frame that does not have the above configuration is attached to the part of the racket frame that is not combined with the above structure using nylon resin with an elastic modulus of 6000 to 1500 kg / cm ² (at equilibrium water content) to integrally protect the part If a gut protector having a structure in which the above-mentioned two configurations are put in series so that the formed portion is mounted, for example, the gut protector is directed from the outer peripheral surface center of the frame to the inner peripheral surface off-center position. The gut insertion holes to be drilled are provided near the maximum width in the vertical direction of the mesh surface and near the maximum width in the horizontal direction.Other than that, the gut insertion holes to be drilled in substantially the same plane as the net surface of the gut should be provided. It can be effectively used for the racket frame.

[0012]

[Effect of device]

From the above, the gut protector of the present invention is mounted on a frame in which the gut insertion hole of the racket frame is drilled from the center on the outer peripheral surface side toward the off center position on the inner peripheral surface side. The gut protector, which is the part that fits into the hole, is made of nylon resin with an elastic modulus of 3000 to 6000 kg / cm ² , so the gut insertion hole can be easily attached to the gut insertion hole. Workability is improved, and since the protective body and the gut sleeve part are separate bodies, even if the tubular body is bent so that it follows the angle of the gut insertion hole, Since the stress does not affect the protective body, when it is mounted on the racket frame, it will not be lifted due to forcing.

The racket frame suitable for mounting the gut protector of the present invention has a distance between the gut insertion hole and the opening on the inner peripheral surface side and the gut net surface. Although the force applied to the tip on the inner peripheral surface side was large and there was a risk of the tip breaking, it does not crack because it is a material with a low elastic modulus.

[Brief description of drawings]

FIG. 1 is a perspective view of a cross section of a main part of a gut protector of the present embodiment.

FIG. 2 is a cross-sectional perspective view of a main part when the gut protector is attached to the frame.

FIG. 3 is an explanatory cross-sectional view of main parts of another embodiment.

FIG. 4 is a cross-sectional explanatory view of a racket frame suitable for mounting the gut protector of the present invention.

FIG. 5 is a cross-sectional explanatory view of a conventional example.

FIG. 6 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Gut Protective Body 2 Protective Body 3 Ear 4 Band 5 Gut Sleeve 6 Cylindrical Body 7 Band-shaped Base 8 Racket Frame 9 Outer Surface 10 Inner Surface 11 Gut Insertion Hole 12 Gut Net Surface 13 Hole M Center a Opening

Claims (2)

[Scope of utility model registration request] 1. A gut insertion hole formed from a central portion of a thickness of the frame in a direction orthogonal to the gut net surface to a position not on the same plane as the gut net surface on the inner circumferential surface side. In a gut protective body mounted on a racket frame having a gut protective body, the gut protective body has a band portion provided with a hole matching the outer peripheral surface side opening of the gut insertion hole, and extending to both widthwise ends of the band portion. And a gut sleeve tubular body in which the tubular body is connected by a belt-shaped base body so as to match the hole of the protective body and the protective body provided with the ear portion provided in the protective body. The protector has an elastic modulus of 6000.
-15000 kg / cm ² (at equilibrium water content) made of nylon resin, the gut sleeve has an elastic modulus of 3000-60
A gut protector for a racket, which is made of a nylon resin of 00 kg / cm ² (at equilibrium water content). 2. The gut protector has an elastic modulus of 6000 to 6000.
And 15,000 kg / cm ² protector and the elastic modulus 3000~6000kg / cm ² comprising a combination of a gut sleeve formed by a nylon resin (at equilibrium moisture content) portion formed by a nylon resin (at equilibrium moisture content), elastic Rate 6000 to 1500
The gut protector for a racket according to claim 1, wherein the protector part is made of a nylon resin of 0 kg / cm ² (at equilibrium water content) and a part integrally formed with the tubular part.