JPS62159666A - Racket - 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 Use after Graduation The present invention relates to a racket for tennis, badminton, etc., which forms a string net surface by stretching strings.

Conventional technology As disclosed in Japanese Patent Application Laid-Open No. 56-8074, tennis rackets have traditionally been made by using a gut holding part that functions as a crown to stretch the guts and form a gut net surface. , as in Japanese Patent Publication No. 44-27260, protrusions for tight hooking IF are formed on the front and back surfaces of the frame, or protrusions are formed on the inner periphery of the frame as in Utility Model Publication No. 52-76758, and the protrusions are Is there a way to form a string mesh surface by providing string insertion holes in the racket frame?Usually, string insertion holes are drilled across the inner and outer peripheral surfaces of the racket frame by passing the frame through C1, and the strings are inserted into the holes. A common method is to form a tight mesh surface by threading.

In addition, there have been disclosed rackets in which the gut mesh surface is made of a qt-shape, and rackets in which two mesh surfaces are arranged parallel to each other with an interval in the ball hitting direction, but in general, the gut mesh surface is 1. −
Moreover, the gutt insertion hole was formed on the same plane as the gutt mesh surface. More recently, Jikko 58-
46838, a so-called large size racket or semi-large size racket is known that attempts to widen the sweet spot by making the area of the gutt mesh surface larger than that of a conventional regular size racket.

Problems to be Solved by the Invention However, when attaching strings to these large size rackets and semi-large size rackets, there are the following problems.

In other words, large-sized and semi-large-sized rackets have larger frames than traditional regular-sized rackets, so they tend to flex easily, and if you tension them with the same tension as a regular-sized racket, the tension will be looser. The coefficient of restitution increases, and therefore the pole flies too far, making it difficult to control. Therefore, in order to reduce the coefficient of restitution and improve pole control, the tension of the gut must be greater than when tensioning a regular-sized racket. The stress applied to it also increases as the right side increases, and the strength becomes unreasonable. In addition, the tension of the string gradually decreases with repeated use of the racket, so the string must be re-lengthened from time to time, and this can prevent the frame from caving in or breaking. It was also an easy cause.

Means for Solving the Problems Therefore, in view of these conventional drawbacks, the present invention has been developed to reduce the tension of the strings of tennis rackets, particularly large rackets and semi-large rackets, by reducing the tension of the strings of the conventional large rackets and semi-large rackets. A racket that has a string mesh surface with a tension that provides the desired coefficient of restitution without making it too large compared to the racket, and that can minimize the loosening of the strings that occurs due to repeated use. It was made for the purpose of providing.

To explain the structure of the present invention based on drawings of a tennis racket, FIG.
9), the frame (2) is provided with gutts (6) in a bow-length manner to form a gutt net surface (3). 2 is an enlarged perspective view of point B in FIG. 1, and FIG. 3 is an enlarged perspective view of point A in FIG.
- An enlarged cross-sectional explanatory view taken in the direction of the A line, showing the state when the string is stretched in the direction of the present invention.

A feature of the present invention is that when forming the string net surface (3) by passing the frame through the racket frame (2) and extending the string (6) into the string insertion hole (4), the outer peripheral surface of the frame is A string insertion hole (4) that is drilled from the side (5) toward the center of the string mesh surface (3) has a gap between it and the string mesh surface that is formed by stretching strings in the string insertion hole. This racket is characterized in that it is perforated to have a distance of 1i1to. Therefore, as shown in Fig. 2, the gut (6a) stretched in the gut insertion hole (4)
The string (6A) facing perpendicularly from the opening 1 (4') of the string insertion hole appearing on the string mesh surface side (3'), that is, the string (6A) bent and stretched against the mesh surface (3). It will be established.

When comparing the configuration of a conventional racket and one embodiment of the present invention, the difference is clear. Figure 7 shows a conventional racket (1
1), it consists of a frame (12), a throat part, and a grip part, and the frame has a mesh surface (13).
is formed. FIG. 8 is a sectional view taken along the line C--C in FIG. 7. That is, in the conventional racket, the opening (14) appearing on the string mesh surface (13) side of the frame of the string insertion hole (14), which is bored through i'I through the frame (12), is Inner peripheral surface (10)
Therefore, if the guts (6) are stretched through these guts insertion holes (14), at least the guts mesh surface (13) and the guts of the frame will be connected to each other. Gut insertion hole opening (14) that appears on the mesh side
are formed so that they are located on the same plane.

Therefore, according to the string tensioning method for a racket having such a structure, adjacent strings are positioned on the same plane as the string surface.

However, according to the tensile force method shown in the third figure which shows an example of the present invention, the adjacent guts (6a) and (6b) have respective gut insertion holes (4a).

(4b) are drilled at a distance from each other with the gutt mesh surface as the center.

Therefore, if you install guts in these gut insertion holes,
At least the openings (4
') is not located on the same top surface as the gutt net surface (3).

The string insertion holes of the present invention are not only drilled all around the racket frame, but also in any arbitrary range centered on the widest point in the longitudinal direction of the string surface.
It may be perforated in both the Ren and Butsu areas centering on the widest point in the horizontal direction, or in either the vertical direction or the horizontal direction.

Function In the present invention, when drilling from the outer circumferential side of the frame that forms the gutt mesh surface (3) and the gutt insertion hole toward the gutt mesh surface side, the gutt insertion hole is a straight gutt insertion hole. The hole is bored so that there is a distance between the hole and the string surface formed by inserting the string into the hole. Therefore, if the gut is stretched through the gut insertion hole drilled in this way, the gut will be stretched three-dimensionally at the inner peripheral part of the frame, for example, as shown in FIG. ) will be pushed down at these contact points (B1) by the guts (6A) intersecting at right angles, and conversely the guts (6b) will be pushed up at the contact points (B2) of the guts (6A).

In other words, Gatsuto (6A) is] 1 “Gatsuto (6a)
, (6b) is the contact point (Bl).

(B2) is used as a fulcrum and the strings are stretched in opposite directions, so it looks like the strings are woven and raised, and it can be tightened firmly with less tension than before, and the strings with the L-shaped tension are different from each other. Since the rackets are intertwined with each other, it is difficult for the rackets to loosen, and therefore, the loosening caused by repeated use of the rackets 1 to 1 can be reduced.

Other Embodiments In other embodiments of the present invention, as shown in FIG.
2) Both sides of (7) Gut insertion hole 4 as shown in section 1
may be drilled.

Further, as shown in FIGS. 5 and 6, a protrusion (8) extending toward the center of the frame is provided on the inner peripheral surface of the frame at any location on which the present invention is to be implemented.
The gut insertion hole 4 may be bored so that the opening (4') appears on the first side (7) of the screw.

Furthermore, in order to drill the gutt insertion holes 4 as shown in FIG. In addition to drilling holes alternately on the left and right sides according to the guttural tension on both sides,
As shown in FIG. 5, it is also possible to simultaneously drill the left and right holes in parallel.

Effects Traditionally, when attaching a gut to a large or semi-large size racket, you had to pull it with much stronger force than with a conventional regular size racket. According to the racket of the present invention,
Since the string insertion holes are drilled so that they each have a distance @D on the upper f with the string mesh surface as the center, when strings are stretched, adjacent strings can move the strings facing each other at right angles in opposite directions. It is shaped like a puller (14) and can be tensioned so that a larger tension can be obtained with less pulling force of the string.Therefore, the load on the frame can be reduced and the coefficient of restitution of the string surface can be adjusted. The durability of the racket is improved.

Furthermore, by implementing the configuration of the present invention in an arbitrary range, centering on the widest part in the vertical and horizontal directions, where the frame of the ball hitting part has the largest deflection, and therefore, the tensile force of the gut is least likely to be applied. In addition to reducing the stress burden on the frame, which improves durability, it also makes it possible to even out the distribution of the spring constant on the gutt mesh surface, resulting in relatively uniform pole repulsion over the entire gutt mesh surface. It is something that can be done.

In addition, the flowering portions (4') of the gutt insertion holes that appear on the gutt mesh surface side of the frame are arranged so that the gutt insertion holes (4') appear at both ends of the width of the inner circumferential surface of the frame, or on both f11 sides of the frame. If this hole is drilled, the distance of the string insertion hole from the string surface can be easily adjusted depending on the structure or design of the racket.

Furthermore, as shown in FIGS. 5 and 6, a protrusion (8) extending toward the center of the gut mesh surface is provided on the inner peripheral surface of the frame, and openings (4') appear on both sides of the protrusion. As shown in the figure, if a gut insertion hole is drilled, there is no need for special reinforcement on the frame, making it easy to manufacture.In addition, a weight for balance:A adjustment is built into the arm protrusion (8). By doing so, the moment of inertia can be improved and the sweet spot can be expanded.

In addition, when drilling the gut insertion holes of the present invention, reinforcing the frame can be minimized by drilling alternately at both ends of the width of the inner circumferential surface of the frame or on the left/Ll of both sides according to the string tensioning order. I can do it. Furthermore, if the holes are formed in one row at the same position on the left and right sides, a mesh surface having the effects of the present invention can be obtained no matter what order the strings are placed. Thus, tennis fools badminton, squash,
It is useful to apply this method to racket poles and other rackets that form a gut mesh surface.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of a racket according to the present invention. FIG. 2 is an enlarged perspective view of point B in FIG. FIG. 3 is an enlarged cross-sectional explanatory view taken along line A-A in FIG. 1. 4 to 7J, and FIG. 5 are enlarged perspective views of the point B portion in other embodiments. FIG. 6 is a front view of the racket in the embodiment shown in FIG. FIG. 7 is a front view of a conventional racket, and FIG. 8 is a cross-sectional view taken along line C-C. 1.11... Tennis racket, 2.12... Frame, 3, 13... Gutto net surface, 4° 4a, 4b, 14
---Gut insertion hole, 4', 14'...opening part, 5
...Outer peripheral surface, 6.6a, 6b, 6A...Gut, 7
...Side surface, 8...Protrusion, lO...Inner peripheral surface. Figure 7 Figure 3 Figure 6

Claims (1)

[Scope of Claims] 1. In forming a string net surface by drilling a string insertion hole through the racket frame and tensioning the string in the string insertion hole, from the outer peripheral surface of the frame, The string insertion hole drilled toward the center of the string mesh surface is formed so as to have a distance D between it and the string string surface formed by stretching the string through the string insertion hole. A racket to play. 2. The string insertion hole is formed toward a position having a distance D from the secondary center of the outer circumferential surface of the frame to the string mesh surface on the string mesh surface side. The racket described in Section 1. 3. A racket characterized in that the string insertion hole is formed in an arbitrary range centering on the widest point in the vertical direction, horizontal direction, or both directions of the racket frame.