IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0971830
(2001-10-04)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
14 |
초록
▼
A sports racket, for tennis and the like sports, has an elongated handle attached to a head having a racket face, which is spanned by a uniform string structure. The head has four sides, forming a non-elliptical shape, in which the opposite sides are substantially parallel. Longitudinal strings, all
A sports racket, for tennis and the like sports, has an elongated handle attached to a head having a racket face, which is spanned by a uniform string structure. The head has four sides, forming a non-elliptical shape, in which the opposite sides are substantially parallel. Longitudinal strings, all of which are substantially identical in length and run essentially parallel to each other, and transversal strings, all of which are substantially identical in length and run essentially parallel to each other and perpendicular to the longitudinal axis, span the racket face. The racket has a larger racket face than conventional rackets, while maintaining the length and weight measurements of conventional rackets, resulting in a very large sweet spot and more good hits. The racket has maximally long strings at all points on the racket face and strings substantially identical in length at all points on the racket face resulting in a uniformity of response for off-center hits, an increase in the ball rebound speed, a decrease in angular deflection for off-center hits, and the ability to set the tension of the strings such that they vibrate with the same frequency. The racket has a greater moment of inertia than conventional rackets, resulting in reduced racket rotation and a reduction of injuries to players, such as "tennis elbow".
대표청구항
▼
What is claimed is: 1. A racket comprising: a frame having a handle defining a longitudinal axis; a head connected to the handle and defining a racket face, wherein the head has parallel first and second transversal sides and parallel first and second longitudinal sides, wherein the first and secon
What is claimed is: 1. A racket comprising: a frame having a handle defining a longitudinal axis; a head connected to the handle and defining a racket face, wherein the head has parallel first and second transversal sides and parallel first and second longitudinal sides, wherein the first and second transversal sides and the first and second longitudinal sides are firmly connected together at their ends such that each of the sides is substantially inflexible in relation to the other sides; a plurality of transversal strings extending between the first and second longitudinal sides and substantially covering the racket face, wherein the transversal strings are of substantially identical length, wherein the transversal strings run essentially parallel to each other, wherein the transversal strings are generally perpendicular to the longitudinal axis, and wherein at least three of the transversal strings are strung from a first single string; and, a plurality of longitudinal strings extending between the first and second transversal sides and substantially covering the racket face, wherein the longitudinal strings are of substantially identical length, wherein the longitudinal strings run essentially parallel to each other, wherein the longitudinal strings are generally parallel to the longitudinal axis, and wherein at least three of the longitudinal strings are strung from a second single string; wherein the transversal strings and the longitudinal strings are of unequal length, and wherein the tension and/or mass values of the transversal strings and the longitudinal strings are selected so that the vibrational frequencies of the transversal and longitudinal strings are equal. 2. The racket of claim 1 wherein the head and the racket face are rectangular shaped. 3. The racket of claim 1 wherein at least a pair of the first and second transversal sides and the first and second longitudinal sides curve slightly. 4. The racket of claim 3 wherein the curved sides have a curvature such that the string tension of the strings between the curved sides brings the curved sides back to a substantially straight and parallel position. 5. The racket of claim 1 wherein the distances between all intersection points of the string are equal. 6. The racket of claim 1 wherein the space between the transversal strings varies, and wherein the space between the longitudinal strings varies. 7. A racket comprising: a frame having a handle defining a longitudinal axis; a head connected to the handle and defining a racket face, wherein the head has parallel first and second transversal sides and parallel first and second longitudinal sides, and wherein the first and second transversal sides and the first and second longitudinal sides are firmly connected together at their ends such that each of the sides is substantially inflexible in relation to the other sides; a plurality of transversal strings extending between the first and second longitudinal sides and substantially covering the racket face, wherein the transversal strings are of substantially identical length, wherein the transversal strings run essentially parallel to each other, and wherein the transversal strings are generally perpendicular to the longitudinal axis; and, a plurality of longitudinal strings extending between the first and second transversal sides and substantially covering the racket face, wherein the longitudinal strings are of substantially identical length, wherein the longitudinal strings run essentially parallel to each other, wherein the longitudinal strings are generally parallel to the longitudinal axis, and wherein at least three of the longitudinal strings and at least three of the transversal strings are strung from a single string; wherein the transversal strings and the longitudinal strings are of unequal length, and wherein the tension and/or mass values of the transversal strings and the longitudinal strings are selected so that the vibrational frequencies of the transversal and longitudinal strings are equal. 8. The racket of claim 7 wherein the head and the racket face are rectangular shaped. 9. The racket of claim 7 wherein at least a pair of the first and second transversal sides and the first and second longitudinal sides curve slightly. 10. The racket of claim 9 wherein the curved sides have a curvature such that the string tension of the strings between the curved sides brings the curved sides back to a substantially straight and parallel position. 11. The racket of claim 7 wherein the distances between all intersection points of the strings are equal. 12. The racket of claim 7 wherein the space between the transversal strings varies, and wherein the space between the longitudinal strings varies. 13. A racket comprising: a frame having a handle defining a longitudinal axis; a head connected to the handle, wherein the head has parallel first and second transversal sides and parallel first and second longitudinal sides, wherein the first end second transversal sides and the first and second longitudinal sides has holes therethrough and are firmly connected together at their ends such that each of the sides is substantially inflexible in relation to the other sides; a plurality of transversal strings being strung through the holes in the first and second longitudinal sides, wherein the transversal strings are of substantially identical length, wherein the transversal strings run essentially parallel to each other, and wherein the transversal strings are generally perpendicular to the longitudinal axis; and, a plurality of longitudinal strings being strung through the holes in the first and second transversal sides, wherein the longitudinal strings are of substantially identical length, wherein the longitudinal strings run essentially parallel to each other, wherein the longitudinal strings are generally parallel to the longitudinal axis, and wherein the transversal and longitudinal strings are secured to the frame by at least one knot; wherein the transversal strings and the longitudinal strings are of unequal length, and wherein the tension and/or mass values of the transversal strings and the longitudinal strings are selected so that the vibrational frequencies of the transversal and longitudinal strings are equal. 14. The racket of claim 13 wherein the head has a racket face covered by the longitudinal and transversal strings, and wherein the head and the racket face are rectangular shaped. 15. The racket of claim 13 wherein at least a pair of the first and second transversal sides and the first and second longitudinal sides curve slightly. 16. The racket of claim 15 wherein the curved sides have a curvature such that the string tension of the strings between the curved sides brings the curved sides back to a substantially straight and parallel position. 17. The racket of claim 13 wherein the distances between all intersection points of the strings are equal. 18. The racket of claim 13 wherein the space between the transversal strings varies, and wherein the space between the longitudinal strings varies.
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