摘要:
A tennis racket is provided that has a rectangular ball striking face with rounded corners. The racket is formed of a carbon fiber sandwich with light material mounted therebetween. A strip of carbon fiber is attached to the outer edge spanning the two carbon fiber top and bottom sheets. The rectangular frame is formed with outwardly bowed sides so as to be pulled into a straight sided configuration by the string tension. Locking grommets of various constructions are provided to hold the strings at predetermined tensions. Testing equipment and methods are provided for testing tennis rackets.
摘要:
A sports racquet having a plurality of string port holes (20), i.e enlarged string holes having two inwardly facing string bearing surfaces which are spaced apart by a distance corresponding to the distance between two contiguous main strings or cross strings, and conventional string holes (18) is formed of a single tube of prepreg material. When molded, mold members (34) press opposed portions of the prepreg tube into contact with one another, and shape the opposed portions and the surrounding prepreg material (37) into a string port hole blanks (40). The portion of the pressed-together material which initially blocks the string port hole (20) is removed after molding so that the string port holes (20) extend through the frame. Alternatively, the mold members (64) cause the prepreg tube to follow a serpentine shape, thereby defining string port holes (62) which are open alternately along the top and bottom surface of the frame. A pair of cover rings (74) may be secured to the top and bottom racquet surfaces (70,72) to cover the open sides of the string port holes (62).
摘要:
The invention provides an improved racquet and a method of stringing a racquet wherein the racquet (10) includes grommets (12, 14, 16, 18, 20) that are divided into visually differentiated groups in order to make stringing the racquet quicker and easier. According to one embodiment, the grommets are visually differentiated by color, while in another embodiment, the grommets are visually differentiated by shape (100, 110, 120, 130).
摘要:
Ce cadre (2) de raquette de badminton (1) comprend des orifices (5) de passage d'une corde destinée à former le tamis de la raquette, ces orifices (5) étant équipés d'oeillets (7) de guidage de la corde alors qu'au moins une zone en creux est formée par le côté extérieur (2 a ) dudit cadre pour la réception de cette corde (8) passant dans deux des orifices (5). La zone de réception (z) a, sur la plus grande partie de sa longueur, une première largeur inférieure au diamètre maximum (d 2 ) des oeillets (7) et, au niveau des orifices (5), une seconde largeur supérieure à ce diamètre (d 2 ). Cette zone (z) permet une réception efficace de la corde sans diminuer sensiblement la rigidité du cadre (2). Les oeillets (7) ont une tête (7 b ) évasée permettant un appui surfacique sur les zones d'entrées évasées (5 a ) des orifices (5).
摘要:
A racket string consists of lengthwise sections having different tensile elastic moduli with at least one section of the string having a tensile elastic modulus higher than other sections. A stringed racket includes at least one string constituting the central stringed area of the racket with higher tensile elastic modulus, and a peripheral stringed area with sections of the string having lower tensile elastic modulus. Another stringed racket includes at least one string constituting the central stringed area of the racket with lower tensile elastic modulus and a peripheral stringed area with sections of the string having higher tensile elastic modulus.
摘要:
In a tennis or squash racket, the strings (22, 24) are mounted without friction on the frame (12) and arranged at the surface of the frame in such a way that two parallel strands (22c, 22d) of the same string are distant by at least one ball diameter. Between said two parallel strands two other strands (24d) belonging to an other string (24) are arranged. Such arrangement of the strings allows to distribute the tension resulting from a stroke on the ball in areas which have not been in contact with the ball.
摘要:
A racket (1) including: a handle (20); an annular frame (11) having a plurality of through holes (13), and a groove section (111) provided on an outer peripheral face (11a) of the frame along a circumferential direction of the frame; a shaft (30) connecting the handle and the frame; and a string (12) that passes through the through hole to the outside of the frame, and that is folded back on the groove section, wherein when either one of a longitudinal direction (121) of the racket and a width direction (122) perpendicular to the longitudinal direction on a hitting surface of the racket is defined as a first direction, a depth of a position at which the string is folded back at a second position in the first direction is smaller or less than a depth of a position at which the string is folded back at a first position in the first direction, the first position being located on the outer peripheral face of the frame, the second position being located on the outer peripheral face of the frame and outside of the first position in the first direction.
摘要:
A racquet includes polyester, monofilament racquet string and a frame extending along a longitudinal axis and including a head portion coupled to a handle portion. The head portion includes a hoop having inner and outer peripheral walls. The hoop defines a head size having maximum longitudinal and transverse dimensions, a , and, b , respectively. The dimension a is at least 1.2 times the dimension b . The inner peripheral wall includes string holes. The string has a diameter within the range of 1.10 to 1.55 millimeters. The string forms a string bed of interlaced main and cross string segments. Each of the cross segments transversely extends from one of the string holes to another, and each of the main segments longitudinally extends from one of the string holes to another. The string bed has at least one more main segment than cross segment, At least one of the main segments contacting the tennis ball exhibits a snap back velocity of at least 1 meter per second.
摘要:
Sports racquet (1) comprising a handle (2) and a head portion (3) adapted to support a string bed (4) lying on a reference plane. The string bed of the sports racquet comprises a plurality of meshes (43) with an average area of 200 mm 2 or greater.
摘要:
A racket (1) including: a handle (20); an annular frame (11) having a plurality of through holes (13), and a groove section (111) provided on an outer peripheral face (11a) of the frame along a circumferential direction of the frame; a shaft (30) connecting the handle and the frame; and a string (12) that passes through the through hole to the outside of the frame, and that is folded back on the groove section, wherein when either one of a longitudinal direction (121) of the racket and a width direction (122) perpendicular to the longitudinal direction on a hitting surface of the racket is defined as a first direction, a depth of a position at which the string is folded back at a second position in the first direction is smaller or less than a depth of a position at which the string is folded back at a first position in the first direction, the first position being located on the outer peripheral face of the frame, the second position being located on the outer peripheral face of the frame and outside of the first position in the first direction.