Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis

Patent metadata

Field	Value
Publication number	US-10946253-B2
Application number	US-202015929517-A
Country	US
Kind code	B2
Filing date	May 6, 2020
Priority date	Mar 12, 2018
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A racquet extends along a longitudinal axis and is capable of being tested under a racquet lateral bending test and a racquet torsional stability test. The racquet lateral bending test includes mounting the racquet in a first orientation to a first test fixture at a first longitudinal location, attaching a clamp to the racquet at a second location, operably engaging a deflection indicator to the clamp, applying a first predetermined weight to the racquet at a third location, and removing the first weight to obtain a lateral deflection measurement of the racquet with respect to the longitudinal axis. The racquet torsional stability test includes mounting the racquet to second and third test fixtures at sixth and seventh locations of the racquet, respectively, placing a third predetermined weight on an arm extending from the second test fixture, removing the third predetermined weight to obtain an angular deflection about the axis. The racquet comprises a frame including head and handle portions and a throat portion positioned between the head and handle portions. The head portion forms a hoop that defines a string bed plane. When the racquet is tested under the racquet lateral bending test, the racquet has a lateral deflection of at least 6.0 mm when measured in a direction that is parallel to the plane and perpendicular to the axis. When the racquet is tested under the racquet torsional stability test, the racquet has an angular deflection of less than 5.0 degrees about the axis.

First claim

What is claimed is:

1. A tennis racquet extending along a longitudinal axis and capable of being tested under a racquet lateral bending test and a racquet torsional stability test, wherein the racquet lateral bending test includes mounting the racquet in a first orientation to a first test fixture at a first location, attaching a clamp to the racquet at a second location, operably engaging a deflection indicator to the clamp, applying a first predetermined weight to the racquet at a third location, and removing the first weight to obtain a lateral deflection measurement of the racquet with respect to the longitudinal axis, and wherein the racquet torsional stability test includes mounting the racquet to second and third test fixtures at fourth and fifth locations of the racquet, respectively, placing a second predetermined weight on an arm extending from the second test fixture to place a torsional load on to the racquet, removing the second predetermined weight to obtain an angular deflection about the longitudinal axis, and the racquet comprising:
a frame including a head portion, a handle portion, and a throat portion positioned between the head portion and the handle portion, the head portion forming a hoop that defines a string bed plane, the throat portion including a pair of throat elements, wherein, when the racquet is tested under the racquet lateral bending test, the racquet has a lateral deflection of at least 6.0 mm when measured in a direction that is parallel to the string bed plane and perpendicular to the longitudinal axis, wherein, when the racquet is tested under the racquet torsional stability test, the racquet has an angular deflection of less than 5.0 degrees about the longitudinal axis.

2. The racquet of claim 1 , wherein the racquet is capable of being tested under a racquet forward/rearward bending test, wherein the racquet forward/rearward bending test includes mounting the racquet in a second orientation to the first test fixture at the first location, applying a third predetermined weight to the racquet at a sixth location, operably engaging the deflection indicator to the racquet at a seventh location, and removing the third predetermined weight to obtain a forward/rearward deflection measurement with respect to the longitudinal axis, wherein the racquet is rotated 90 degrees about the longitudinal axis from the first orientation to the second orientation, wherein, when the racquet is tested under the racquet forward/rearward bending test, the racquet has a forward/rearward deflection with respect to the longitudinal axis of at least 8.5 mm when measured in a direction that is perpendicular to the string bed plane and perpendicular to the longitudinal axis.

3. The racquet of claim 2 , wherein the racquet is capable of being tested in a racquet vibration test, wherein the racquet vibration test utilizes a modal analysis system including a hammer, an accelerometer and a modal analysis frame for supporting the racquet in a free-free condition during modal analysis, and wherein, when the racquet is tested under the racquet vibration test, the racquet has a vibration of no greater than 135 Hz.

4. The racquet of claim 2 , wherein the head portion includes a forward hoop surface and a rearward hoop surface, wherein the distance between the forward and rearward hoop surfaces is a beam height distance, and wherein the head portion has a maximum beam height distance of at least 19 mm.

5. The racquet of claim 1 , wherein at least the head portion and the throat portion of the racquet are formed at least in part of a fiber composite material.

6. The racquet of claim 1 , wherein the head portion, the handle portion and the throat portion of the racquet are formed at least in part of a fiber composite material.

7. The racquet of claim 1 , wherein the head portion includes a yoke, and wherein the yoke is formed of a fiber composite material.

8. The racquet of claim 1 , wherein the hoop defines a string bed area, and wherein the string bed area is within the range of 93 to 120 square inches.

9. The racquet of claim 8 , wherein the string bed area has a maximum longitudinal dimension and a maximum transverse dimension, and wherein the size of the maximum longitudinal dimension is at least 1.2 times the size of the maximum transverse dimension.

10. The racquet of claim 1 , wherein the hoop defines a string bed area, and wherein the string bed area is within the range of 98 to 115 square inches.

11. The racquet of claim 1 , wherein the racquet is capable of being tested in a racquet vibration test, wherein the racquet vibration test utilizes a modal analysis system including a hammer, an accelerometer and a modal analysis frame for supporting the racquet in a free-free condition during modal analysis, and wherein, when the racquet is tested under the racquet vibration test, the racquet has a vibration of no greater than 135 Hz.

12. The racquet of claim 1 , wherein the head portion includes a forward hoop surface and a rearward hoop surface, wherein the distance between the forward and rearward hoop surfaces is a beam height distance, and wherein the head portion has a maximum beam height distance of at least 19 mm.

13. The racquet of claim 1 , wherein, when the racquet is tested under the racquet lateral bending test, the racquet has a lateral deflection of at least 6.5 mm when measured in a direction that is parallel to the string bed plane and perpendicular to the longitudinal axis.

14. A tennis racquet extending along a longitudinal axis and capable of being tested under a racquet torsional stability test, wherein the racquet torsional stability test includes mounting the racquet in a first orientation to first and second test fixtures at first and second locations of the racquet, respectively, placing a first predetermined weight on an arm extending from the first test fixture to place a torsional load on to the racquet, removing the first predetermined weight to obtain an angular deflection about the longitudinal axis, and the racquet comprising:
a frame extending along a longitudinal axis and including a head portion, a handle portion, and a throat portion positioned between the head portion and the handle portion, the head portion forming a hoop that defines a string bed plane, the head portion including a forward hoop surface and a rearward hoop surface, the distance between the forward and rearward hoop surfaces being a beam height distance, the head portion having a maximum beam height distance of at least 19 mm, the throat portion including a pair of throat elements, at least the head portion and the throat portion of the racquet being formed at least in part of a fiber composite material, the fiber composite material including a plurality of ply arrangements, each of the ply arrangements including a pair of plies with one ply having a first plurality of fibers defining a first angle with respect to a composite axis and the other ply having a second plurality of fibers defining a second angle with respect to the composite axis, the first and second angles being substantially the same except the first and second angles have opposite angular polarities with respect to the composite axis, the head portion including at least three ply arrangements overlaying each other, and the first and second angles of at least two of the at least three ply arrangements are at least 35 degrees, and
wherein, when the racquet is tested under the racquet torsional stability test, the racquet has an angular deflection of less than 5.0 degrees about the longitudinal axis.

15. The racquet of claim 14 , wherein the racquet is capable of being te

Assignees

• Wilson Sporting Goods

Inventors

• Severa William D
• Zwack Dale J
• Kapheim Robert T
• Compostizo Eloisa M

Classifications

• A63B2225/02

  Testing, calibrating or measuring of equipment · CPC title

• A63B2209/02

  with reinforcing fibres, e.g. carbon, polyamide fibres · CPC title

• A63B51/005 Primary

  Devices for measuring the tension of strings (for controlling the tension during stringing A63B51/14) · CPC title

• B29C70/085

  the structure being deformed in a three dimensional configuration (B29C53/805 takes precedence) · CPC title

• A63B2049/0204

  width · CPC title