JPH05208054A - Game racket and method of stringing it on head frame part - Google Patents

Abstract

PURPOSE: To provide a racket for competition having a nearly uniform impact characteristic. CONSTITUTION: The racket is provided with a frame head 5 having an impact surface 3 consisting of a main string 4 and a cross string. The main string 4 and the cross string pass through the holes formed in the frame head 5 in two conceptual planes 1, 2 parallel to the impact surface 3. The conceptual planes 1, 2 are provided to both sides of the impact surface 3 at equal spaces from the impact surface 3 respectively. The continuous end parts of the main string 4 and the cross string pass through the holes that are alternately provided to the conceptual places 1, 2 respectively. Both ends of the strings of the number larger than 2/3 (66.67%) of the total number of strings pass through the holes provided to the same conceptual plane 1 or 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to competition rackets, for example for tennis, squash or badminton. The improvement of the present invention resides in a new string tensioning method that gives the racket a beneficial playing effect.

[0002]

BACKGROUND OF THE INVENTION Most rackets include a head frame portion and a handle portion, the head frame portion having a hole therethrough and two sets of strings. , One of the strings (the “main” string) extending substantially in the longitudinal direction and the other string (the “intersecting” string) extending substantially in the lateral direction, the main string and the intersecting string being interdigitated to each other. Provides a flat playing surface. The "main string" and "intersecting string" may or may not intersect at right angles. When stringing the head frame portion by passing the string through the hole, the form of the string is of course largely determined by the form of the hole. Most rackets are formed such that the axis of each hole is in the mid-plane (referred to below as the plane of the combined strings) formed by the combined main and intersecting strings.

The present inventor has found that a certain effect can be obtained by providing a hole for a string in a specific form on a surface other than the surface of the combined string.

[0004]

In accordance with the present invention, a competition racket comprises a headframe portion forming a generally flat assembly of interlocking main and cross strings, said main and cross strings comprising: , Through respective holes in the headframe portion axially provided in one of two conceptual planes parallel to the planes of these combined main and intersecting strings, said conceptual plane being It is provided on both sides of the surface of the combined main string and the intersecting string at equal intervals from the surface, respectively, so that the continuous ends of the main string and the intersecting string are in the conceptual plane. All of the main strings and intersecting strings are designed so that they enter the holes provided alternately. Respect two thirds (66.67%) greater number of strings than both end portions of each of the strings is arranged to pass through the holes in the same notional plane.

In accordance with another aspect of the present invention, a method of stringing a head frame portion of a competition racket includes providing holes in the frame for a main string and a cross string, the holes being two parallel conceptual holes. Located on a plane,
The string is inserted through the holes such that successive ends of the main and intersecting strings enter holes that are alternately provided in the conceptual planes, with respect to the planes between the conceptual planes. The step of combining the main strings and the intersecting strings with each other in planes that are parallel and equidistant from the conceptual plane, the number of the main strings and the intersecting strings being 3
For more than two (66,67%) number of strings, both ends of each string are threaded through holes in the same conceptual plane.

One way to obtain the above arrangement is to provide an odd number of main strings and an odd number of intersecting strings.

The potential play effect of the present invention is for a ball that comes into contact with the vicinity of the frame and is carried by a string that is basically half as many as in the normal case, which is the ball felt by the player. Has the effect of reducing the impact of. This generally improves the racket spacing uniformity for ball contact over the stringed playing surface.

Another play effect of the above construction is
When the string bed (playing surface) is deformed by the ball hitting the strings, the tension of the adjacent strings changes, and the tension in one string increases,
The tension in the other string is reduced.
This has the effect that every other string with high tension can dig deeper into the surface of the ball, giving more spin to the ball. Deeper bite can also be obtained for shuttlecock corks, for example, which is effective in badminton competitions.

A significant advantage of the present invention is that the racket head typically has a central region (ie, two outermost intersecting strings and corresponding two main strings, or two outermost main strings and corresponding two main strings). A main string and a crossing string defined by two crossing strings and located within a rectangle or quadrilateral that is inscribed in the racket head), where the ends of each string are in the same conceptual plane It is obtained when the condition of passing through is met. The strings make up more than 66.67% of the total number of strings on the racket, and generally more than 75%.
However, the number of strings satisfying the above condition is 10
It can be increased to 0% so that the total area of the string surface contributes to the desired attributes mentioned above and provides the best racket properties.

In the preferred embodiment of the invention, the holes for the main and intersecting strings at the points where the ends of the adjacent strings are adjacent are orthogonal to the mating planes in this conceptual plane and at this point. Is provided in a plane orthogonal to the tangent line of the head frame portion.
At other locations where the ends of the main and intersecting strings are not adjacent, the holes are provided in displaced positions relative to each other rather than being aligned in a plane orthogonal to the mating planes. As a modification of this embodiment, two or more sets of adjacent ends of the main string and the intersecting string can be provided, in which case it is only necessary to provide two string holes of each set in different conceptual planes. Instead, it is provided in a plane that is orthogonal to the combined planes and orthogonal to the tangents of the head frame portion at these positions.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described, by way of example only, with reference to the drawings.

With reference to FIGS. 1 and 2, the holes for the intersecting strings formed in the frame 5 of the racket lie in two conceptual planes 1, 2 which are parallel to these planes. Located on either side of the plane of the combined string 3 at equal distances from. The holes are alternately provided in one conceptual plane and in the other conceptual plane, and are spaced from each other in each plane and between both planes, which results in the mesh of the net of the string. Giving proper spacing. Although not shown, an odd number of intersecting strings is provided. Although not clearly shown, the main strings 4 have the same form and the number of these main strings is odd. FIG. 2 shows that the ends of adjacent strings alternate between one conceptual plane and the other, and both ends of the string lie in the same conceptual plane. .. In FIG.
The central region of the racket head (ie, the region defined by the two outermost intersecting strings and the corresponding two main strings and enclosed by the rectangle or quadrilateral inscribed in the racket head (A ₁ , B ₁ , Area surrounded by C ₁ , D ₁ ) or an area surrounded by two outermost main strings and corresponding two intersecting strings and surrounded by a rectangle or quadrilateral inscribed in the racket head) A ₂ , B ₂ , C ₂ , D ₂ )) The requirement that both ends of each string of the main string and the intersecting string located within) lie in a hole in the same conceptual plane. Meets Although the racket head shown is a tennis racket, the number of main and cross strings has been reduced for clarity. Rackets for tennis are usually
With a larger number of strings of each type.

It will be appreciated that, when the main string and the intersecting string are combined, the body portion of the string lies in the same plane as it occupies in a conventional stringed racket. However, in the vicinity of the frame, each string is separated from said surface and can therefore pass through holes provided in separate conceptual planes located on opposite sides of the surface of the combined strings.

[Brief description of drawings]

FIG. 1 is a partial side view of the head portion of a novel competition racket.

2 is a cross-sectional view of the head portion of the racket across the frame of FIG.

FIG. 3 is a front view of the head portion of the novel competition racket shown in FIGS. 1 and 2.

[Explanation of symbols]

1, 2 Conceptual plane 3 Face of combined string 4 Main string 5 Racket frame

Claims (8)

[Claims] 1. A headframe portion (5) forming a substantially flat assembly of assembled main strings and cross strings, said main strings and cross strings comprising faces of these combined main strings and cross strings. (3) passes through respective holes in the head frame portion axially provided in one of two conceptual planes (1, 2) parallel to each other, the conceptual planes being combined with each other. It is provided on both sides of the surface (3) of the main string and the intersecting string at equal intervals from the surface (3), respectively, so that the continuous ends of the main string and the intersecting string are arranged in the conceptual plane. In a competition racket adapted to enter the holes provided alternately in (1 and 2) respectively, Two-thirds (66.
67%), a competition racket characterized in that the ends of each string are configured to pass through holes in the same conceptual plane (1 or 2). 2. The competition racket according to claim 1, wherein the number of main strings is an odd number. 3. The competition racket according to claim 1 or 2, wherein the number of intersecting strings is odd. 4. The competition racket according to any one of claims 1 to 3, wherein, for a number of strings greater than 75% of the total number of main strings and intersecting strings, both ends of each string have the same conceptual plane. A racket for competition characterized by passing through a hole in. 5. A competition racket according to any one of claims 1 to 4, wherein both ends of each string are in the same conceptual plane for almost 100% of the main strings and intersecting strings. A racket for competition characterized by passing through a hole. 6. The competition racket according to any one of claims 1 to 5, wherein at each position where the ends of the main string and the intersecting string are adjacent to each other, holes for these strings are provided in the conceptual plane. The racket according to claim 1, wherein the hole is provided in a plane that is orthogonal to the surfaces of the main string and the intersecting string and is orthogonal to the tangent line of the head frame portion at that point. 7. The competition racket according to claim 6, wherein there are two or more pairs of adjacent ends of the main string and the intersecting string. 8. A method of tensioning strings on a head frame portion of a competition racket, the frame comprising holes for main strings and intersecting strings, the holes being located in two parallel conceptual planes. The string is inserted through the holes so that successive ends of the main string and the intersecting strings enter the holes alternately provided in the conceptual planes, and parallel to the planes between the conceptual planes. And a method of combining the main string and the intersecting string with each other in a plane provided at an equal distance from the conceptual plane, two-thirds of the number of the main string and the intersecting string (66, 67).
%), The ends of each string being threaded through holes in the same conceptual plane.