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

Patent metadata

Field	Value
Publication number	US-10653924-B2
Application number	US-201816012368-A
Country	US
Kind code	B2
Filing date	Jun 19, 2018
Priority date	Mar 12, 2018
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A sports racquet capable of being tested under a racquet vibration test, and including a frame extending along a longitudinal axis. The frame includes a head portion, a handle portion, and a throat portion positioned between the head portion and the handle portion. The head portion forms a hoop that defines a string bed plane. The throat portion includes a pair of throat elements. At least the head portion and the throat portion of the racquet are formed at least in part of a fiber composite material. The head portion including a forward hoop surface and a rearward hoop surface. The distance between the forward and rearward hoop surfaces defines a beam height distance. The head portion has a maximum beam height distance of at least 19 mm. When the racquet is tested under the racquet vibration test, the racquet has a vibration of no greater than 130 Hz.

First claim

What is claimed is:

1. A sports racquet capable of being tested under a racquet vibration test, the racquet vibration test utilizing a modal analysis system including a hammer, an accelerometer removably attached to the racquet, and a modal analysis frame for suspending the racquet in a free-free condition during modal analysis, the racquet comprising:
a racquet 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 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 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; and
wherein, when the racquet is tested under the racquet vibration test, the racquet has a vibration of no greater than 130 Hz.

2. The sports racquet of claim 1 , wherein the maximum beam height distance is at least 20 mm.

3. The sports racquet of claim 1 , wherein the maximum beam height distance is at least 21 mm.

4. The sports racquet of claim 1 , wherein the maximum beam height distance is at least 22 mm.

5. The sports racquet of claim 1 , wherein, when the racquet is tested under the racquet vibration test, the racquet has a vibration of no greater than 120 Hz.

6. The sports racquet of claim 1 , wherein, when the racquet is tested under the racquet vibration test, the racquet has a vibration of no greater than 115 Hz.

7. The sports racquet of claim 1 , wherein, when the racquet is tested under the racquet vibration test, the racquet has a vibration of no greater than 110 Hz.

8. The sports racquet of claim 1 , wherein at least one layer of the fiber composite material includes a plurality of braided fibers.

9. The sports racquet of claim 8 , wherein the plurality of braided fibers have a braid angle of at least 35 degrees with respect to the longitudinal axis.

10. The sports racquet of claim 1 , wherein the frame has a weight within the range of 180 gm to 370 gm.

11. The sports racquet of claim 1 , wherein the plurality of fibers used in the fiber composite material are selected from the group consisting of carbon fibers, glass fibers, boron fibers, aramid fibers, basalt fibers, graphite fibers, boron fibers, carrot, poly-para-phenylene-2, 6-benzobisoxazole (PBO) fibers, hemp fibers, flax fibers, other natural fibers and combinations thereof.

12. The sports racquet of claim 1 , wherein the racquet is capable of being tested under a racquet lateral bending test, wherein 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, and 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.

13. The sports racquet of claim 12 , 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 a first test fixture at a first longitudinal location, operably engaging a deflection indicator to the racquet at a fourth location, applying a second predetermined weight to the racquet at a fifth location, and removing the second predetermined weight to obtain a forward/rearward deflection measurement with respect to the longitudinal axis, and 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.

14. The sports racquet of claim 13 , wherein the racquet is capable of being tested under a racquet torsional stability test, wherein 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 to place a torsional load on to the racquet, removing the third predetermined weight to obtain an angular deflection about the longitudinal axis, and wherein, when the racquet is tested under the racquet torsional stability test, the racquet has an angular deflection of less than 5.5 degrees about the longitudinal axis.

15. The sports racquet of claim 13 , 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 9.0 mm when measured in a direction that is perpendicular to the string bed plane and perpendicular to the longitudinal axis.

16. The sports racquet of claim 12 , wherein the racquet is capable of being tested under a racquet torsional stability test, wherein 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 to place a torsional load on to the racquet, removing the third predetermined weight to obtain an angular deflection about the longitudinal axis, and wherein, when the racquet is tested under the racquet torsional stability test, the racquet has an angular deflection of less than 5.5 degrees about the longitudinal axis.

17. The sports racquet of claim 1 , wherein the racquet is capable of being tested under a racquet forward/rearward bending test, wherein the forward/rearward bending test includes mounting the racquet in a second orientation to a first test fixture at a first longitudinal location, operably engaging a deflection indicator to the racquet at a fourth location, applying a second predetermined weight to the racquet at a fifth location, and removing the second predetermined weight to obtain a forward/rearward deflection measurement with respect to the longitudinal axis, and 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.

18. The sports racquet of claim 17 , wherein the racquet is capable of being tested under a racquet torsional stability test, wherein 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 to place a torsional load on to the racquet, removing the third predetermined weight to obtain an angular deflection about the longitudinal axis, and wherein, when the racquet is

Assignees

• Wilson Sporting Goods

Inventors

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

Classifications

• A63B2209/02

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

• A63B49/10

  made of non-metallic materials, other than wood · CPC title

• A63B2220/64

  Frequency, e.g. of vibration oscillation · CPC title

• A63B2102/02

  Tennis · CPC title

• G01N3/34

  generated by mechanical means, e.g. hammer blows · CPC title