JPS6036071A - Eyelet string piece for racket - Google Patents

Abstract

1. A flexible stringer strip (1) of hard elastic material for a racket having stretched strings, in particular a tennis racket, the strip having string-protecting sleeves (2) arranged at a definite distance (9) apart and made in one piece with the stringer strip (1), characterized in that the stringer strip (1) in each portion of the stringer strip between two string-protecting sleeves (2) exhibits at least one expansion portion (3) such that under tensile loading of the stringer strip (1) in the direction of its longitudinal extent only or essentially only the said expansion portion (3) is able to expand.

Description

[Detailed Description of the Invention] Field of Application of the Invention This invention relates to the flexibility of a racket, especially a tennis racket, having a tensioned waist surface of a string and an eyelet for securing the string. concerns the eyelet strips.

In the case of the well-known eyelet strip in the conventional tennis racket FC, τ
The frame of the tennis racket is made so that the spacing between the protective eyelets of the pre-inserted T-eye strips is problematic, and the protective eyelets are inserted into the thread holes. Niro thread hole ν
It is very difficult to match the protective eyelets precisely.

The reason for such problems is, among other things, that, except for the string holes in the center of the racket, at the ends of the holes the direction of the holes is perpendicular to the imagined tangent to the frame or t! Because they run at right angles, the thread holes along the frame have different angles with respect to the common base axis.

In fact, is there a US patent for flexible thread tension eyelet strips of the type mentioned above? , 9 J 4 &<7g. 7 However, in such cases 11 strips 1 (in which case the thread supports a fastening loop made to be tensioned in one through the eyelet and returned through the eyelet in the gap). A relatively thick support pad is provided between each eyelet. The eyelet strip also extends towards the center of the racket and towards the head of the racket, along with the remaining arcuate pad. It must be possible to adapt the arrangement of the holes in the racket structure by creating a spacing between large shield eyelets at angles that vary from the edges of the part.Special eyelet strips of this type are specially It can only be used for rackets with different spacings between the holes.Moreover, due to the different angular positions mentioned above and the unavoidable gap mJ of the thread holes, the assembly process is relatively thin. Yes.

Therefore, the main object of the invention is to provide an easy way to insert the eyelet strip into the racket without additional energy and time requirements and to easily compensate for manufacturing tolerances.
” To provide a double series of eyelet strips and to provide a method by which the foregoing difficulties can be solved by simple means ((
be.

These and other objects, features and advantages of the invention include:
BRIEF DESCRIPTION OF THE DRAWINGS The invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings, which serve only to illustrate some embodiments of the invention.

Embodiment An eyelet strip l of a tennis racket or other racket having a striking surface with tensioned threads is formed in one piece with protective eyelets λ provided at a predetermined spacing from each other. The dome protrudes from the body of the eyelet strip l at the IR angle. Preferably made from a hard elastic material, the section 3 in the form of an elongated corrugation in the eyelet strip/n ζ is made to compensate for the longitudinal variation of the eyelet strip l. In each case λ protruding eyelets are provided.

The extension according to the embodiment of FIG. 1 // has thin edges j, 4
When looking in the direction of S, it extends in the plane of the eyelid piece / -
There is C. In addition, FIG. 1 shows seven types of waveforms fiTI'
l is shown in 1 m flat. In the left part of the figure, at least one waveform part ./, at least three in the figure, are formed, and the edges j, A and the opposite edges &,! Same as in the lateral direction: (Extending grooves and notches 7.g are provided alternately.

As a result, a waveform part q is formed between the eyes of each set of waveform parts 3.Such a waveform f'ils lIK
The distance 9 between the widths and zeros of each set can thus be easily varied and adapted to the opening yζ between the holes in the racquet frame through which the string is tensioned without significant expense.

In FIG. 7, the corrugation 9 o) with respect to the center line M can have a length from half one wavelength λ to several wavelengths λ.

One wavelength λ, 1. Between S and 10mm, wait 11
A value between S and llmm is suitable. The elasticity of the waveform 61≦ can be adjusted and determined by the =j modulus of the upright beam portion lθ and the edge arc portion // that extends in the transverse direction with respect to the eyelet strip/VC.

In the central corrugated portion l shown in FIG. 1, a corrugated portion D is formed (a V-shaped notch 12 is provided. In the case of the corrugated portion 9 shown in the right-hand side portion of FIG. 2, The center notch is formed as a V-shaped notch /-2, and the outer notch /3 is formed as a half-square notch /Jt.

Another embodiment is shown in Figure 2.3. In this embodiment, the protruding portions of the corrugated portion DA are located above and below the center line, and the second
As particularly shown in the figures, the corrugations extend perpendicularly to the plane of the body of the eyelet strip. In this case, the material can be made weaker, as shown by the left-hand side and central embodiments, where the corrugations are thinner than the adjacent parts of the eyelet strips l. This makes it possible for the corrugation crests to not necessarily need to protrude from the upper surface /9 and the lower surface /S of the eye-to-eye strip / as in the case of the central section 3.

Although several embodiments have been illustrated and described according to this Preparation I, the present invention is not limited to these embodiments.
As is well known to those skilled in the art, modifications and changes can be made to Vc4 and U, and therefore, it is not desired to be limited to the details shown and described (although all aspects included within the scope of this invention) Variations and modifications are intended to be covered.

[Brief explanation of drawings]

FIG. 1 is a plan view of a grommet strip with corrugations extending in the plane of the grommet strip; The side view, FIG. 3, is a plan view of the eyelet strip according to FIG. In the figure, /: td and eye strip 1
．． 22 eyelet, 3: division, tick waveform part, s, t,: edge, 7, 8: notch, 9: interval, lθ: beam part, /l: inner arc part, /, 2. /,? : Notch, /lI: Top surface, /S:
Lower m1゜

Claims (1)

[Scope of Claims] 1 It has a double eyelet that engages in the thread hole of the racket frame, and the eyelets are provided at a predetermined distance from each other. In the same strip for racquets, the threads of which are attached integrally with the main body of the racket are tensioned, at least one extending section is provided between the sets of protective eyelets, each extending section being tensioned. The section is a dovetail strip for a racket that forms a means for changing the predetermined spacing so that the predetermined spacing matches the spacing between the thread holes of the racket frame. When viewed from the direction of the thin lateral line of the body of the strip, there is a small (
A dovetail strip for a racket according to claim 1, wherein each strip has seven extending corrugated sections. 3. The wavelength of the extended waveform part is 8! - The same strip for a racket as claimed in claim 2, which has a diameter of 10 mm. D. The extending corrugated portion is formed by at least one contact notch extending toward the opposite side edge of the same strip. Same strip as for racket. 3. The same strip for a racket as set forth in claim 1, wherein the wavelength of the extending corrugated portion is 3 to 10 mm. 4. A dovetail strip for a racket according to claim 1, in which the extending section is formed by two corrugations extending at right angles to the center line passing through the body of the dovetail strip. Piece 7. The same strip for a racket as set forth in claim 6, wherein the wavelength of the extending corrugated portion is /j to #7 mm. & The same strip main body as the material forming the extended corrugated portion. A dovetail strip for a racket according to claim 6, which is thinner than the eyelet strip. ? Claim ii'F in which the extended corrugated portion does not protrude beyond the upper and lower surfaces of the main body of the eyelet strip. (, [eye strips) for the racket described in item g.