JPS61162966A - 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 The present invention relates to a racket, and more particularly to a tennis or squash racket.

A particular object of the invention is to provide a tennis or squash racket which provides significantly better control of the ball. This means that the ball is in contact with the string for a longer period of time and penetrates deeper into the string network so that the player can put more spin on the ball.

To achieve this, the invention provides that the average mesh surface area of the string net is equal to at least 170 ml for tennis rackets and at least 100 mm for squash rackets, and is completely surrounded by two pairs of strings crossed with each other. The geometric figure located at the top means the mesh of the net, and the two pairs of strings exist in a polygon formed by four straight lines extending two by two in a parallel relationship with each other. and the length of the four straight lines is equal to half the length of the longest axis in the first direction, and also equal to half the length of the longest axis along the direction intersecting the first direction. The definition of said axis will be further explained later.

According to an advantageous embodiment of the tennis racket according to the invention, the string diameter is at least 1.60 m, and for squash rackets the string diameter is at least 1.50 m.

Other details and other advantages of the invention will become apparent from the following description, given by way of non-limiting example and with reference to the accompanying drawings, in which: FIG.

The tennis or squash racket shown in the drawings is of conventional type as far as frame construction is concerned.

This allows the frame to be made of any suitable material, e.g. metal,
It should be understood that it can be made of wood or synthetic materials or a combination thereof. Size is not part of the principles of the invention. The racket according to the invention can be characterized in a number of ways.

A significant feature of the racket according to the invention can be found in the average mesh surface area of the string net.

The mesh surface area is at least 170III+2 for tennis rackets and at least 1OOIllIIIt for squash rackets.

The mesh surface area can be calculated as follows.

Determine the direction of the string within the 1i1i area of the racket.

The string direction is the average direction for all strings within an angle of ±io' from the mean value. Usually two directions are seen. In the area of the striking surface, determine the longest possible axes along the two directions (Sl and S2 in FIG. 1, S3 and S4 in FIG. 2). When a plurality of axes are considered along a specific direction, the axis that is most symmetrically located with respect to the hitting region is considered.

The lengths of the axes are indicated by Ll and L2 in FIG. 1 and L3 and L4 in FIG. 2. About said axis, half interval (
L1/2 and L2/2 in Figure 1, LaI3 in Figure 2
and L4/2) are the axes S1 and S2, or S3 and S4
are shown symmetrically with respect to the intersection of Now points A, B, C
, D (Fig. 1) and points A', B', C', D' (
A polygon can be drawn by drawing a line in parallel relation to the axis passing through the polygon (FIG. 2). As shown in FIGS. 1 and 2, the polygon is a rectangle. The polygon may also be in the form of a rhombus or other geometric figure. Then, the average mesh surface area of the polygon can be determined. As mentioned above, the average mesh surface area is at least 170 for tennis rackets.
mm”, amounting to at least 100n+n+2 for squash rackets.

The term "average mesh surface area" means the sum of the surface areas of all meshes completely inside a specified polygon divided by the number of meshes within the polygon.

As already made clear at the outset, the string diameter of the tennis or squash racket is also a feature of the invention. The string diameter is at least 1.60 ta for tennis racquets and at least 1.50 ta for squash racquets. For this purpose, the string can be made of synthetic or natural materials. In addition to the string diameter and mesh surface area determined earlier,
The racket of the present invention can be further specified by the number of strings it has.

Along the direction parallel to the longest string, the number of strings is high (14) not only for squash rackets but also for "medium-sized" tennis rackets. The above number is at most 1
There are 5 pieces.

For so-called "oversized" tennis racquets, the number of strings is preferably 14, considering the strings extending spaced apart in parallel relation to the longest string, and the strings along the other direction. Considering this, there are 16 pieces. The term "oversized" means a racket that meets the following requirements:

(a) The striking surface area is 548 or more (b)
The maximum length within the striking area is at least 30.5 cs
(C) The maximum width within the striking area is at least 24.1
A "medium-sized" racket that is C11 is a racket that does not meet the above definition of an "extra-large" racket.

A tennis and squash racket of the above-described type having the above-described features and characteristics as defined in the claims improves the grip of the ball by the string net and increases the contact time of the ball with the string net so as to improve control of the ball. make it good

The racquet according to the invention has a string net with a significantly larger mesh surface area. For this purpose, the ball penetrates deep into the reticular surface (reticular surface between the strings) and
The ball thus remains in possession for a fraction of a second longer, giving the players that much more time to control the ball. Also, by using a larger diameter string, the striking surface can be made more suitable, which has a more favorable effect on the control of the ball.

By using such strings, the string tension can be increased up to 60 ksr, by combining the trampoline effect (which is due to the ball penetrating deep into the string net) and the high tension.
A racket with very high efficiency is obtained. This means that the energy transferred to the ball is maximized.

By limiting the number of strings, the number of holes in the frame of the racquet according to the invention is also reduced, which increases the strength or resistance of the frame.

It is understood that the invention is in no way limited to the embodiments described above and that many modifications of the invention can be made without departing from the scope of the invention as set forth in the claims. There must be.

[Brief explanation of drawings]

FIG. 1 is a plan view of a possible embodiment of a tennis racket according to the invention. FIG. 2 is a plan view of a possible embodiment of a squash racket according to the invention. FIG. 3 is an enlarged view showing the shape of the string. [Explanation of main reference symbols]

Claims (1)

Claims: 1. A racket, in particular a tennis or squash racket, in which the average mesh surface area of the string network is equal to at least 170 mm^2 for a tennis racket, at least 100 mm^2 for a squash racket, and mutually A mesh is a geometric figure completely surrounded by two pairs of intersecting strings, and the two pairs of strings are four straight lines extending two by two in parallel to each other. The length of the four straight lines is equal to half the length of the longest axis in the first direction, and the first
A racket characterized by a racket whose length is equal to half the length of the longest axis along the direction intersecting the direction of. 2. A racket according to claim 1, in particular a tennis racket, characterized in that the string diameter is at least 1.60 mm. 3. In particular, a so-called "medium-sized" tennis racket, characterized in that the number of strings along the direction in which the number of strings is the greatest is at most 15, or The racket described in Section 2. 4. In particular, a so-called "medium-sized" tennis racket, characterized in that the number of strings along the direction in which the number of stringers is the least is at most 14. The racket described in any one of Section 3. 5. In particular, a so-called "extra-large" tennis racket, characterized in that the number of strings along the direction in which the number of strings is the greatest is at most 16, or The racket described in Section 2. 6. In particular, a so-called "extra-large" tennis racket, characterized in that the number of strings along the direction with the least number of strings is at most 14, The racket according to item 2 or 5. 7. A racket according to claim 1, in particular a racket for squash, characterized in that the string diameter is at least 1.50 mm. 8. In particular, the racket for squash according to claim 1 or 7, characterized in that the number of strings along the direction in which the number of strings is the largest is at most 15. racket. 9. Claims 1, 7 or 9, particularly for a squash racket, characterized in that the number of strings along the direction in which the number of strings is the least is at most 14. The racket described in Section 8. 10. A racket, in particular a tennis or squash racket, characterized in that the string diameter is at least 1.60 mm for tennis rackets and at least 1.50 mm for squash rackets.