JPS6348291Y2 - - Google Patents

Description

[Detailed explanation of the idea]

FIELD OF THE INVENTION The present invention relates to a competition racket of the type used in playing tennis, squash, badminton, and other racket-based games. Although the invention can be used with a wide variety of rackets of the type used for playing games such as tennis, skates, badminton, etc., it will be described here as a racket with an oval head, such as a tennis racket, and a racket with an oval head, such as a skates racket. refers to a racket with a circular head. Such reference shall further include rackets of the type used to play other games. BACKGROUND OF THE INVENTION Tennis rackets generally consist of a frame containing a metal or wooden handle having a grip attached to one end and a substantially oval head attached to the other end. Typically nylon or string nettings extend across the head; the most common type of netting is a first set of strings extending parallel to the longitudinal axis of the handle (hereinafter referred to as the "vertical direction"). and a second group of strings extending in a direction perpendicular to the longitudinal axis of the handle (hereinafter referred to as the "horizontal direction"). Generally, horizontal and vertical strings are interwoven with each other, with every horizontal string above and below two adjacent vertical strings, and every vertical string above and below two adjacent horizontal strings. and below. Racquets have been manufactured in the past using netting patterns that include groups of strings other than the standard horizontal and vertical patterns. For example, U.S. Patent No. 9, 1928 entitled "Competition Racket" issued to CAClaremont.
No. 1,687,322 describes a racquet using wire strings in a racquet with a resilient rim. The wire strings of the racket described by Claremont are interwoven in a diagonal pattern, with two groups of parallel strings interwoven with each other, all strings being at an angle to the longitudinal axis of the handle. There is. Another tennis racket using two groups of interwoven diagonal strings was introduced on November 4, 1975 by C.
No. 3,917,267 entitled Tennis Racquet, issued to A. McGrath.
Two groups of interwoven diagonal strings are used in the racquet described in the patents to Claremont and McGrath. here,
The term "diagonal" means that the direction of the strings is diagonal to the longitudinal axis of the handle, and the term "interlaced" means that adjacent strings of one group of strings are means that the strings are woven alternately above and below the adjacent strings. British Patent No. 5177, entitled "Improvements in the Method of Stringing Lawn Tennis Racquets and Other Racquets," patented to W. D. Nightingale on January 27, 1886, uses three groups of strings and uses two A tennis racket is described in which the group is diagonal and the third group is horizontal. When looking at the racket from the front, all the strings in one of the diagonal groups are positioned above all the strings in the other diagonal group. The strings of the horizontal group are knitted through the two diagonal groups in such a way that they lie above all the strings of the upper diagonal group and below all the strings of the lower diagonal group. be combined. Furthermore, none of the intersections of the horizontal strings with either string of the other diagonal group coincide with the intersections of the diagonal strings of the other diagonal group with the diagonal strings of one diagonal group. It uses 20 horizontal strings and 18 strings in each diagonal direction.
A problem observed with Nightingale's tennis rackets is that the strings range from 40 to 75 pounds (approx.
If the racket is pulled within the standard range (34.0Kg), the racket will not function properly. It was discovered that the reason the Nightingale racket did not function well was because the racket used a large number of strings. [Purpose of the invention] Compared to traditional rackets, the ball can be kept on the string for a longer period of time, can withstand greater vertical tension, has greater resting force, allows the string to grip the ball better, and has a better grip on the ball. To provide a racket capable of imparting spin and better control of fly balls. [Means for Achieving the Object] According to the present invention, in a racket of a type having an open head at one end of the handle, (a) the shape of the open head is such that the long axis coincides with the longitudinal axis of the handle; , having a minor axis perpendicular to the major axis; (c) a second group of substantially parallel strings stretched diagonally across said head to form a first angle with said first group of strings; (d) a second string 22 with respect to the first group of strings so as to form a second angle with the second group of strings;
a third group of substantially parallel strings 24 extending across the head at an angle opposite to the strings of the group, the second angle being opposite to the first string;
a third group of strings forming an opposite angle with the first group of strings that is substantially equal to said first angle;
Each of the strings of the group is positioned above the string of the third group, and each of the strings of the first group is positioned above the string of the second group.
(e) an opening formed by the first, second and third groups of strings is located above each of the strings of the group and below the strings of the third group; It is characterized by being formed by a hexagon having two opposite sides parallel to the long axis and a diagonal line parallel to the long axis, and a triangle having each of the two sides as one side. Provide a racket that can be used. [Operation] Referring to FIG. 1, a tennis racket according to the present invention is shown. The racket 10 has a grip 1 on one end.
4. Consists of a handle 12 with a handle 12. racket 10
The frame is constructed of suitable materials such as wood or metal. Both wooden and metal frame rackets can be constructed in accordance with the present invention, and racquets made of any material will perform better than rackets with wooden or metal frames that do not utilize the present invention. I understand. Racket 10 has an open head 16 which is typically substantially oval or oval in the case of tennis rackets, but typically circular in the case of squash rackets. Head 16
is the handle 12 located away from the grip 14.
at the edge of The head 16 has a net of three groups of strings 18 extending across it.
The strings in each group are substantially parallel to each other, with the first group of strings being substantially parallel to the longitudinal axis of handle 12. The strings of the second group are diagonal in one direction with respect to the strings of the first group, and the strings of the third group are diagonal in the other direction with respect to the strings of the first group.
The angle between the second group of strings and the third group of strings is substantially twice the angle between the first group of strings and the second or third group of strings. In a preferred embodiment of the invention, the first group of strings, or vertical strings, is comprised of 9 to 16 strings, both for rackets with an oval head, such as a tennis racket, and for rackets with a circular head, such as a squash racket. It consists of a string of The number of strings in the second and third groups or diagonal groups is equal to each other, between 9 and 20 for rackets with an oval head and between 9 and 16 for rackets with a circular head. It is between. Preferably, the string tension is inversely proportional to the number of strings in the racquet, about 40 pounds for an oval-headed racquet with 12 vertical strings and 20 strings each in a diagonal direction. (approximately 18.1 kg) and approximately 75 lb (approximately 34.0
Kg). For a racket with a circular head, the tension is about 25 pounds for a racket with 14 vertical strings and 14 strings each diagonally.
Kg) and about 55 for a racket with 9 vertical strings and 9 strings each in diagonal direction.
lb (approximately 24.9Kg). Table 1 below more fully displays the relationship between the number of strings and the tension range (in pounds) for an oval head racquet constructed in accordance with the preferred embodiment of the invention. The table more fully displays the relationship between the number of strings and the tension range (in pounds) for a circular head racquet constructed in accordance with the preferred embodiment of the present invention.

【table】

【table】

[Effects of this invention]

The racquet of the present invention has a substantially elliptical head with its long axis oriented vertically and has a vertically tensioned string, so that it can exert a greater tension in the vertical direction than the horizontal strings of the prior art. In addition, it does not have a horizontal string as in the prior art, and the shape of the opening formed by the string is hexagonal and triangular as in the present invention, so it can be sufficiently bent and has a good restoring force. It is larger and can keep the ball on the string for longer than traditional rackets, allowing the string to grip the ball better and give it better spin for better control. The racquet of the present invention creates a sweet spot that keeps the ball on the string for an extended period of time, ensuring that the ball remains in position. Therefore,
When using the racket of the present invention, ball velocity can be increased without much effort, increasing speed, spin, control and accuracy.

[Brief explanation of the drawing]

FIG. 1 is a front view of the tennis racket of the present invention. 2-5 are front views showing how to string the racket of FIG. 1; FIG. 10...Racket, 12...Handle, 14...
...Grip, 16...Head, 18, 20, 2
2, 24... string.

Claims (1)

[Claims for Utility Model Registration] (1) In a type of racket having an open head at one end of the handle, (a) the shape of the open head is such that the long axis coincides with the longitudinal axis of the handle; (b) a first group of heads extending across said head substantially parallel to the longitudinal axis of said handle; substantially parallel string 2
(c) a second group of substantially parallel strings 2 stretched diagonally across said head so as to form a first angle with said first group of strings;
2; (d) angled in a direction opposite to the second group of strings with respect to the first group of strings so as to form a second angle with the second group of strings;
a third group of substantially parallel strings 24 stretched across the head, the second angle being substantially twice the first angle, and the third group of strings being substantially parallel to the first angle. forming an opposite angle substantially equal to said first angle with a first group of strings, each of the second group of strings being positioned above a third group of strings, and each of the first group of strings forming an opposite angle substantially equal to said first angle; (e) an opening formed by the first, second, and third groups of strings is located above each of the second group of strings and below each of the third group of strings; , formed by a hexagon having two opposite sides parallel to the long axis and a diagonal parallel to the long axis, and a triangle having each of the two sides as one side. Features a racket. (2) The product of the number of strings in the first, second and third groups and the tension of the strings is between 1300 pounds (589.7Kg) and 3200 pounds (1451.5Kg). The racket set forth in claim (1) of the utility model registration claim.