JPH0528636B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a racket string protection band and a string protection method applied to, for example, a tennis racket or a badminton racket. By devising the attached protective belt (grommet),
This is designed to enhance the protection effect of the U-turn portions of the strings that are folded back and stretched over each string hole of the frame stringing section.

[Prior Art] Conventionally, in this type of racket, for example, a tennis racket, as shown in FIGS. 6 and 7, a large number of string holes 2 are formed in a frame stringing section 1 in a direction perpendicular to the ball hitting direction. A tapered frame groove 3 with a trapezoidal cross section expanding outward is formed along the outer peripheral side of the frame stringing part 1 which extends through the frame and has each of the stringing holes 2 open. Some devices have a structure in which a protective band 4 made of synthetic resin is fitted into the groove 3.

The string protection belt 4 has a bottom base 5 spanning between the mutually adjacent string holes 2 of each of the frame stringing parts 1, and a pair of sides that extend outward from both ends of the bottom base 5 and open. A concave groove 7 is formed with the side parts 6, 6, and the cross-sectional shape is such that it can be tightly fitted into the frame groove 3 of the frame stringing part 1, and a gut insertion tube part is provided on the back side of the bottom base 5. 8, 8 are integrally formed to protrude in correspondence with the stringing holes 2, 2, and the stringing tube portions 8, 8 are inserted into the stringing holes 2, 2 and fitted into the frame groove 3 of the frame stringing portion 1. When the strings are attached, the U-turn portions exposed to the outside of the strings G, which are folded back and stretched in each of the string holes 2, are buried along the grooves 7 to protect them, while the pressing force due to the tension of the strings G is protected. It is now possible to hold it in place.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional gut protection means, by embedding the U-turn portion of the gut G in the groove 7 of the gut protection band 4, the outer circumferential side of the frame stringing portion 1 is placed on the ground. This can prevent the gut from colliding with the ground (court), etc. when hitting the ground (court), etc., but since the groove 7 is open to the outside, It is easy for pebbles etc. to get in and damage the Gatsuto G, and moreover, the concave groove 7
Opening the frame or exposing the tight U-turn section will disturb the air flow on the outer surface of the frame stringing section when swinging, increasing air resistance, which will only cause a decrease in swing speed. However, there is a problem where wind noise occurs.

Therefore, as a means to eliminate such conventional problems, the gut protection belt 4 is covered with tape or a cover is fitted into the open part of the groove 7 of the gut protection band 4 after the gut is stretched. An attempt has been made to close the open part of the groove 7 of No. 4 to prevent the entry of pebbles etc. into the groove 7 and the exposure of the tight U-turn part, as well as to reduce the air resistance during swing. However, even in this case,
Not only is it troublesome to apply the tape and fit the lid after the string has been stretched, but there are also problems such as the tape peeling off and the lid easily falling off.

[Object of the Invention] This invention was made under the above circumstances, and its purpose is to easily protect the strings without pasting tape or fitting the lid after stringing the strings. To provide a racket gut protection band and a gut protection method capable of closing an open part of the band.

[Means for Solving the Problem] In order to achieve the above-mentioned object, this invention has the following features:
A string protection band is attached to the outer circumferential side of the frame stringing part having a large number of string holes, and has a string insertion tube part that is inserted into each of the string holes and is integrally formed in a protruding manner. A concave groove is formed by a bottom base held by the U-turn part of the gut that is folded back and stretched over each gut hole, and a pair of side parts extending outward from both ends of the bottom base. Both tongue pieces formed at the tips of the respective side parts are deformed inwardly by the tension of the strings folded back and stretched over the respective string holes so as to be able to abut each other and come into contact with each other, thereby closing the open portion of the groove. It is characterized by the fact that

In this case, the gut protection band is made of an elastically deformable synthetic resin material, and both tongue pieces formed at the tips of a pair of side parts extending outward from both ends of the bottom base are bent inward. It is preferable to let

Further, a frame groove into which the string protection band is fitted is formed in a tapered groove shape with a trapezoidal cross section that opens outward on the outer circumferential side of the frame stringing part, and the opening angle of the frame groove with respect to the central axis of the string hole is set to the string protection band. It is preferable that the angle is smaller than the outward opening angle of the pair of side portions of the band.

[Function] That is, the present invention connects the concave groove of the string protection band attached to the outer circumferential side of the stringing part of the frame to the bottom base portion which is held between the U-turn portions of the strings that are folded back and stretched over each string hole. , and a pair of side portions extending outward from both ends of the bottom base, and
The opening portion of the groove is deformed by deforming the tongue pieces formed at the tips of each of the side portions so that they can abut against each other inwardly by the tension of the strings that are folded back and stretched over the respective string holes. As a result, the gutt U-turn section, which is folded back and stretched on the outer peripheral side of the frame stringing section, is closed and contained within the concave groove of the gutt protective band, and also prevents stones, etc., from entering the concave groove. Intrusion and exposure of the tight U-turn portion to the outside are prevented, and air resistance during swinging can be reduced.

Further, a frame groove into which the string protection band is fitted is formed in a tapered groove shape with a trapezoidal cross section that opens outward on the outer circumferential side of the frame stringing part, and the opening angle of the frame groove with respect to the central axis of the string hole is set to the string protection band. Since the opening angle to the outside of the pair of side portions of the band is smaller than that, deformation of the string protective band due to the tension of the string can be easily and easily performed.

[Examples] Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 5. In the illustrated embodiment of the present invention, the frame stringing section has a conventional structure shown in FIGS. 6 and 7, and will be described using the same reference numerals.

1 to 3 show a first embodiment of the method for protecting the strings of a tennis racket according to the present invention. This is a protective band made of elastically deformable synthetic resin material. As shown in FIG. 1, this string protection band 10 includes a bottom base 11 spanning between the mutually adjacent string holes 2, 2 of each of the frame stringing parts 1, and a bottom base 11 extending outward from both ends of the bottom base 11. A concave groove 13 is formed by a pair of side portions 12, 12 that open with each other, and has a cross-sectional shape that can be tightly fitted into the frame groove 3 of the frame stringing portion 1, and the respective side portions 12, At the tip of 12, there is a tongue piece 12
a and 12a are bent inward in a cross-sectional shape so that they face each other. And 1 in the figure
Reference numerals 4 and 14 designate gutt insertion tube portions which are integrally formed to protrude from the back side of the bottom base portion 11 in correspondence with the gutt holes 2 and 2 of the frame stringing portion 1.

That is, in order to attach the above-mentioned gut protection belt 10 to the frame groove 3 of the frame stringing section 1, the second
As shown in the figure, the string insertion tubes 14, 14 integrally formed on the back side of the bottom base 11 are temporarily inserted into the string holes 2, 2 of the frame stringing section 1 and fitted. In this case, the opening angle θ of the tapered frame groove 3 formed on the outer peripheral side of the frame stringing part 1 and having a trapezoidal cross section that opens outward with respect to the central axis a-a of the string hole 2 is determined by the opening angle θ of the string protection band 10. The opening angle to the outside of the pair of side parts 12, 12 is smaller than θ ₁ (θ<θ ₁ ), and in this state, as shown in FIG. 2. When the gut G is folded back and stretched, due to the pressing force due to the tension of the gut G,
The side portions 12, 12 are narrowed inward along the tapered inner wall surface of the frame groove 3, that is, the tongue pieces 12a, 12a formed at the tips of the side portions 12, 12 are narrowed inward. They are elastically deformed so as to mesh with each other and come into butt contact (indicated by solid arrows), and are flush with the outer surface of the frame stringing part 1 to close the open part of the groove 13. The U-turn portion of the string G, which is folded and stretched on the outer circumferential side of the frame stringing section 1, is closed and enclosed within the groove 13 of the string protection band 10.

In addition, FIGS. 4 and 5 show the second diagram according to the present invention.
This shows an example, in which the outward opening angle of the pair of side parts 12, 12 of the gut protection band 10 is the same cross-sectional shape as the opening angle of the gut hole 2 of the frame groove 3 with respect to the central axis a-a. In the device, the connecting base end between the bottom base 11 forming the concave groove 13 of the gutt protective band 10 and the both sides 12, 12 is formed into easily deformable shoulders 13a, 13a,
As shown in FIG. 5, the shoulder portions 13a, 13a are deformed inwardly by only the pressing force due to the tension of the string G when the string is tensioned, so that the pair of side portions 12, 13a are deformed inwardly. By deforming the tongues inward as shown by solid arrows, both tongue pieces 1
2a and 12a are configured to close the opening of the groove 13.

[Effects of the Invention] As is clear from the above description, according to the present invention, there is provided a string insertion tube section attached to the outer circumferential side of a frame stringing section having a large number of string holes and inserted into each string hole. is provided with a gut protection band integrally formed to protrude, and the gut protection band includes a bottom base portion held by the U-turn portion of the gut that is folded and stretched over each of the gut holes, and a bottom base portion that extends outward from both ends of the bottom base portion. A concave groove is formed with a pair of side portions extending to the side portions, and both tongue pieces formed at the tips of each side portion are folded back and stretched into the respective string holes by the tension of the strings. Since the strings are deformed inwardly so that they can butt and come into contact with each other, and the open portion of the groove is closed, the string U can be folded and stretched on the outer peripheral side of the frame stringing section at the same time as the stringing work. The turn part is closed and held in the groove of the gut protection belt, and thereby,
It is possible to reliably prevent pebbles and the like from entering the groove and exposing the gut U-turn portion to the outside, thereby increasing the protective effect of the gut and reducing air resistance during swing.

Further, a frame groove into which the string protection band is fitted is formed in a tapered groove shape with a trapezoidal cross section that opens outward on the outer circumferential side of the frame stringing part, and the opening angle of the frame groove with respect to the central axis of the string hole is adjusted to Since the opening angle to the outside of the pair of side parts of the protective belt is smaller than that of the protective belt, it has the excellent effect that the deformation of the gutt protective belt by the tension of the gutt can be performed simply and easily. .

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view showing a first embodiment of the string protection band used in the racket string protection method according to the present invention, and FIGS. 2 and 3 show the string protection band attached to the stringing part of the frame. FIG. 4 and FIG. 5 are explanatory diagrams showing a state in which a string protection band is attached to a frame stringing section according to a second embodiment of the present invention, and FIG. 6 is a diagram showing a conventional stringing section of a frame stringing section. FIG. 7 is a cross-sectional perspective view of a main part showing a state in which the band is attached, and FIG. 7 is a cross-sectional view of a main part. 1... Frame stringing part, 2... Gut hole, 3...
...Frame groove, 10...Gatsuto protective belt, 11...
Bottom base, 12, 12... Side part, 12a, 12
a... Tongue piece, 13... Concave groove, 14... Gut insertion tube part, a-a... Center axis of gut hole, θ...
Opening angle of frame groove, θ ₁ ... Opening angle of side part, G... Gut.

Claims (1)

[Scope of Claims] 1. A gut formed by forming a concave groove with a bottom base from which a gut insertion tube is integrally formed projecting from the back surface, and a pair of side portions extending outward from both ends of the bottom base. 1. A gut protective belt, characterized in that tongues for closing the openings of the grooves are bent inwardly and facing each other at the tips of each of the side parts. 2. A string protection band is attached to the outer circumferential side of the frame stringing part having a large number of string holes, and has a string insertion tube part that is inserted into each of the string holes and integrally formed to protrude therefrom, and the string protection band includes: A concave groove is formed by a bottom base that is held by a U-turn portion of the gut that is folded back and stretched over each of the gut holes, and a pair of side parts that extend outward from both ends of the bottom base, and Both tongue pieces formed at the tips of the respective side portions are deformed so as to abut each other inwardly by the tension of the strings folded back and stretched into the respective string holes, and the open portions of the grooves are opened. A racket gut protection method characterized by occlusion. 3. The gut protection band is characterized in that both tongue pieces formed at the tips of a pair of side parts extending outward from both ends of the bottom base are bent inward. Racket Gut Protection Law as described in . 4. A frame groove into which the string protection band is fitted is formed in a tapered groove shape with a trapezoidal cross section that opens outward on the outer circumferential side of the frame stringing part, and the opening angle of the frame groove with respect to the central axis of the string hole is adjusted to match the string protection band. A racket gut protection method according to claim 2 or 3, characterized in that the opening angle to the outside of the pair of side portions of the band is smaller than that of the band.