FR2686262A1 - Racket frame ensuring good shock absorption - Google Patents

Abstract

The loop-shaped part (20) of a racket frame includes first and second parts (21, 22) which are divided by the longitudinal axis (L) of the racket which extends from the throat (30) as far as an upper point (23) on the loop-shaped part (20). The first part (21) includes a first point (E), the cross section of which is greatest and which is adjacent to the upper point (23); a second point (H), the cross section of which is greatest and which is adjacent to the throat (30); a fifth point (F) between the first and second points (E, H), which has a larger first cross section; and a sixth point (G) between the fifth and second points (F, H) which has a smaller second cross section. Application to tennis rackets.

Description

The present invention relates to a racket frame

  and more particularly, an improvement in the construction

  tion of the loop-shaped part of the racket frame.

  A racket of this type is described in U.S. Patent No. 5,048,830 This racket frame

  ensuring good shock absorption.

  When playing tennis, the fact that shocks occur when the string passes through the looped part of the racket frame when a ball hits the string is a classic phenomenon. Shocks are transmitted from the loop-shaped frame, the handle and the grip part of the racket frame to the player's hand. Therefore, the player is easily tired and sometimes even injured if he plays a series of matches. In order to reduce or reduce the problem constituted by shock, a good number of shock absorbing means have been developed and added to the state of the art. Most shock absorbing means are provided at the level of the rope or at the level of the loop part of the racket frame US Pat. No. 5,048,830 discloses a racket frame which includes shock absorbing means provided at the loop part of the racket frame. racket Thus, the absorption of a shock in such a racket frame is greatly increased. It is common practice to reduce the disadvantages of an item to a minimum level to thereby ensure

  the most effective use of said article.

  Therefore, a main object of the present invention is to provide a new construction intended to be added to the loop-shaped part of a conventional racket frame so that the racket frame withstands less impact than the frame.

previous racket.

  The aforementioned United States patent describes a racket frame which has a loop-shaped part, a handle part and a groove part located between the loop-shaped part and the handle part and it comprises first and second parts divided by a longitudinal axis which extends along the handle of the racket frame and which crosses the groove part of the racket frame as well as an upper point opposite the groove La

  part in the form of a loop has a cross-section

  versal which varies gradually over the entire length.

  The first part has a first point with the smallest cross section which is adjacent to the upper point and a second point with the largest cross section which is adjacent to the groove The second part has a third point with the cross section is the largest and which is adjacent to the upper point and a fourth point whose cross section is the smallest and which is adjacent to the groove The first and third points as well as the second and fourth points are positioned symmetrically on part of

  racket with respect to the longitudinal axis.

  According to the present invention, additional points are added as follows: a fifth point having a larger first cross section is located between the first and second points of the first part; and a sixth point having a second smaller cross section is located between the fifth and second points; a seventh point with a third smaller cross section is located between the third and fourth points of the second part and a

  eighth point with a fourth cross-section

  larger dirty is located between the seventh and fourth

  points of the second part The first cross-section

  larger dirty is equal to the fourth larger cross section and the second smaller cross section is equal to the third smaller cross section The fifth and seventh points as well as the sixth and eighth points are positioned symmetrically on the part looped frame

  racket with respect to the longitudinal axis.

  Other features and advantages of the present

  the invention will appear in the light of the description

  detailed description which will be read in relation to the drawings, all representing a non-limiting form of the present invention, and among these drawings:

  Figure 1 shows a schematic perspective view

  pective of a racket frame of the prior art; FIG. 2 represents a plan view of the particular embodiment of the present invention, two small parts illustrating a transverse view taken respectively along a line A-A and B-B of the particular embodiment; Figures 3 (A) and 3 (B) respectively show a left side view and a right side view of the particular embodiment of Figure 2; and figure 4 (A) and 4 (B) represent respectively

  an enlarged view of Figures 3 (A) and 3 (B).

  In FIGS. 2 to 4, a racket frame according to the present invention comprises a handle part 10, a loop-shaped frame part 20 and a groove part 30 formed between the handle and the frame

  loop 20 The loop-shaped frame part 20 includes

  carries a first part 21 and a second part 22 which are respectively located on the two sides of the longitudinal axis L of the racket frame The longitudinal axis L

  extends along the handle 10 and crosses a top point

  rieur 23 of the frame 20 as well as the groove part 30.

  The cross-section of the loop-shaped frame 20 is not uniform The cross-section gradually decreases from a given point to a point at the front and increases from this point at the front to another point located further forward Therefore, the total length of the cross section

  of the loop-shaped frame is formed in the same way.

  To further detail, the first part 21 has a first point E of the smallest cross section which is adjacent to the upper point 23 and a second point H of the largest cross section which is adjacent to the groove 30 The second part 22 has a third point P with the largest cross section which is adjacent to the upper point 23 and a fourth point Y with the smallest cross section which is adjacent to the

throat 30.

  It is important to note that the first part 21 also comprises a fifth point F which has a first cross section and which is located between the first point E and the second point H and a sixth point G which has a second cross section and which is located between the fifth point F and the second point H The first and second cross sections of the fifth and sixth points are respectively equal to the largest and smallest cross sections of the first and second points The second part comprises a seventh point Q which has a third cross section which is located between the third point P and the fourth point Y and an eighth point X which has a fourth cross section and which is located between the seventh and fourth points Since the first and second parts are symmetrical in size and in dimension, the

  third and fourth cross sections are respec-

  equal to the first and second cross sections

  dirty Since the largest cross-section of the loop-shaped frame is 30 mm and since the smallest cross-section is 24 mm, the cross-section of the entire loop-shaped frame 20 decreases and increases alternately as shown in FIGS. 3 (A) and 3 (B) The cross section of the loop-shaped frame 20 varies with the variation of the thickness of the loop-shaped frame, this thickness being measured in a direction perpendicular to the

plan of the loop-shaped frame.

  Practical tests have shown and confirmed that the loop-shaped frame 20 of the racket frame of the present invention constituted as described above generates less vibration in the rope of the loop-shaped frame, resulting in less rapid fatigue. of the player's hand, a very remarkable feature that cannot

  be obtained with the racket frame of the prior art.

Claims (2)

  1 racket frame comprising a handle part (10), a loop-shaped frame part (20) and a groove part (30) located between said frame part and said handle part, said loop-shaped part (20) having an upper point (23) opposite said groove (30), comprising a first (21) and second (22) parts divided by a longitudinal axis (L) which extends along said sleeve part ( 10) and which passes through said upper point (23) and said groove (30),   and having a cross section which varies progressively   sively; said first part (21) comprising a first   first point (E) with the smallest cross section, this point being adjacent to said upper point (23), and a second point (H) with the largest cross section, this point being adjacent to said groove (30 ); said second part (22) comprising a third point (P) with the largest cross section, this point being adjacent to said upper point (23), and a fourth point (Y) with the smallest cross section, this point being adjacent to said groove (30);   said first and third points (E, P) being posi-   symmetrically actuated on said racket frame with respect to said longitudinal axis (L); and said second and fourth points (H, Y) being positioned symmetrically on said racket frame with respect to said longitudinal axis (L); characterized in that said first part (21) further comprises a fifth point (F) located between said first and second points (E, H), this seventh point having a larger first cross section, and a sixth point (G) located between said fifth point and said second point (FH), this sixth point having a second smaller cross section;   said second part (22) further comprises a sep-   third point (Q) located between said third and fourth points (P, Y) and having a third transverse section   smaller dirty equal to said second cross section   smaller dirty of said sixth point (G), and an eighth point (X) located between said seventh and fourth points (Q Y) and having a fourth larger cross section equal to said first larger cross section of said fifth point (F); and said fifth and seventh points (F Q) as well   that said sixth and eighth points (G, X) being posi-   symmetrically actuated on said racket frame   with respect to said longitudinal axis (L).   2 racket frame according to claim 1,   characterized in that said cross section of said   part of loop-shaped frame (20) increases progress   from said fourth point (Y) to said eighth point (X), decreases from said eighth point (X) to said seventh point (Q), increases from said   seventh point (Q) until said third point (P), dimi-   naked from said third point (P) to said first   point (E), increases from said first point (E) to   that audit fifth point (F), decreases from said fifth   fifth point (F) to said sixth point (G), increases from said sixth point (G) to said second point (H) and decreases from said second point (H) to said groove (30).