Abstract: A tennis racquet extending along the longitudinal axis and capable of being tested under a forward/rearward bending test and a torsional stability test includes a frame having 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. At least the head portion and the throat portion of the racquet are formed at least in part of a fiber composite material. The throat portion includes a pair of throat elements. When the racquet is tested under the 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. When the racquet is tested under the torsional stability test, the racquet has an angular deflection of less than 5.5 degrees about the longitudinal axis.

Abstract: Provided is a racket frame on which design change can be easily performed by simple processing. The racket frame includes a head formed in a ring shape along a face. On the head, a gut groove in which a base portion for connecting grommets is to be inserted is formed in a radially outer region of the head so as to be recessed toward a radially inner side, and a deformation promotion groove is formed in the radially outer region of the head so as to be recessed toward the radially inner side.

Abstract: The present invention relates to a ball game racket with strings that comprise at least one string comprising a superelastic material.

Abstract: A sports racquet for supporting at least one racquet string and including a frame and at least one string support assembly. The frame includes handle and head portions separated by throat tubes. The head portion has grommet holes, and includes top, bottom, first side and second side regions. The string support assembly includes a grommet structure and at least one bearing element. The grommet structure includes a strip and at least two barrels extending from the strip. Each barrel includes a string hole extending along an axis of the barrel, and extends through a separate one of the grommet holes. The bearing element is coupled to the grommet structure, and includes an upper portion having a grooved rim engaging the string and a deflectable lower portion having opposing cutouts. The support assembly is positioned at one or more of the top, bottom, first side and second side regions.

Abstract: 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.

Abstract: A tennis racket may include a handle with a butt end, and a head configured to support strings. The tennis racket may also include a throat connecting the handle and the head, wherein the racket may have a Power Maneuverability Ratio from about 4500 to about 7915, the Power Maneuverability Ratio governed by the equation: PMR= ( S ? ? W ) ? ( R ? ? W ) ( P ? ? U ? ? W ) , where SW=the moment of inertia in kilogram-centimeters squared of the tennis racket about a swingweight axis that is perpendicular to a longitudinal axis of the tennis racket, parallel to a tennis ball hitting surface contained by the head, and intersecting a point on the handle that is four inches from the butt end along the longitudinal axis, R ? ? W = S ? ? W - ( W ? ? t 1000 ) ? ( b 10 - 10.16 ) 2 , Wt=the weight of the racket in grams, b=the distance in millimeters between a center of gravity of the racket to the butt end.

Abstract: A racket may include a frame including at least one prepreg layer. The at least one prepreg layer may include reinforcing fibers. The at least one prepreg layer may also include a matrix at least partially surrounding the reinforcing fibers. The at least one prepreg layer may also include graphene material.

Abstract: A tennis racket may include a handle with a butt end, and a head configured to support strings. The tennis racket may also include a throat connecting the handle and the head, wherein the racket may have a Power Maneuverability Ratio from about 4500 to about 7915, the Power Maneuverability Ratio governed by the equation: P ? ? M ? ? R = ( SW ) ? ( RW ) ( PUW ) , where SW=the moment of inertia in kilogram-centimeters squared of the tennis racket about a swingweight axis that is perpendicular to a longitudinal axis of the tennis racket, parallel to a tennis ball hitting surface contained by the head, and intersecting a point on the handle that is four inches from the butt end along the longitudinal axis, RW = RW - ( Wt 1000 ) ? ( b 10 - 10.16 ) 2 , Wt=the weight of the racket in grams, b=the distance in millimeters between a center of gravity of the racket to the butt end.

Abstract: A sports racquet with increased string vibration damping has grommets with elongated barrels. The barrels conform closely to the strings, are capable of absorbing vibration, and may be placed on the main strings, the cross strings, or both.

Abstract: 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.

Abstract: Tennis racquet comprises a tennis racquet throat “Triple-Asymmetrical-Yokes system showing the innovative geometric properties and detailing the most relevant angles and lineal general measurements, A tennis racquet throat “Triple-asymmetrical-Yokes” system, comprising: an racquet throat supporting three-asymmetrical-yokes all measured from racquet main-shaft-handle-longitudinal-axis, main-yoke support two-asymmetrical-stretch-shafts diagonally-aligned, and interconnects with right-yoke-left-straight-shaft and left-yoke-right-straight-shaft, main-yoke-lower-square-shaft interconnects with top-octagonal-symmetrical main-handle-shaft, right-yoke support two-asymmetrical-shafts, left-straight-shaft which interconnects to main-yoke-right-stretch-shaft, right-yoke-curved-shaft which form part of the lower-portion-head-frame-loop, left-yoke support two-asymmetrical-shafts, said left-straight-shaft which interconnects to main-yoke-left-stretch-shaft, left-curved-shaft which form part of the lower-portion of head-fra

Abstract: A racquet including a frame having a head portion coupled to a handle portion, and a string bed of interlaced cross and main string segments. The head portion includes a hoop having inner and outer peripheral walls. The hoop defines a head size having a 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 cross segments transversely extend from one of the string holes to another, and the main segments longitudinally extend from one of the string holes to another. The cross segment closest to the handle portion and the end point of the longitudinal dimension, a, closest to the handle portion define a second longitudinal dimension, c. The ratio of dimension a to dimension c is at least 6.5. The string bed has at least one more main segment than cross segment.

Abstract: A racquet identification system for use with at least first and second racquets supported by a multi-racquet support structure. Each of the first and second racquets includes a head portion. The system includes first and second head cards coupled to the head portion of the first and second racquets, respectively. The first and second head cards include first and second bodies and first and second projections extending from the first and second bodies, respectively. The shape of the first body is similar to the shape of the second body. The first body and the first projection define a first orientation. The second body and the second projection define a second orientation. The first and second orientations are different. The first and second racquets have at least one characteristic that varies between the first and second racquets, and the first and second projections are configured to highlight the characteristic.

Abstract: A sports racquet extending along a longitudinal axis and configured for supporting a quantity of racquet string generally about a string plane. The racquet includes a frame formed of a thermoplastic material and including a head portion and a handle portion. The head portion is formed of first and second hoop regions. At least one of the first and second hoop regions includes a first set of projections extending from one of the first and second hoop regions across the string plane and engaging the other of the first and second hoop regions. The first set of projections space apart the first and second hoop regions by a first predetermined dimension to define a plurality of through-hoop region openings. The handle portion is formed of first and second handle regions directly coupled together without defining either a plurality of handle openings.

Abstract: A sports racquet extends along an axis and is configured for use with a quantity of racquet string forming a string bed about a string plane. The racquet includes a frame formed of a thermoplastic material, and including first and second halves including first and second spaced apart hoop regions, and first and second handle regions, respectively. The hoop regions includes projections extending from hoop regions in a direction orthogonal to the string plane. At least one of the hoop regions defines a set of bores. The projections are configured to matably engage the bores. The projections extend through the string plane and define curved bearing surfaces configured for engaging and supporting the racquet string. The projections include first and second projections having first and second radii of curvature, respectively. The first radius of curvature being at least 0.5 mm greater than the second radius of curvature.

Abstract: A racket frame 2 includes a head 4, a shaft 8, and a pair of throats 6 extending from the head 4 to the shaft 8. A flexural rigidity G15 of the throats 6 in a low load range (from 5 kgf to 15 kgf) is equal to or greater than 600 kgf/mm but equal to or less than 900 kgf/mm. A flexural rigidity G55 of the throats 6 in a high load range (from 45 kgf to 55 kgf) is equal to or greater than 900 kgf/mm but equal to or less than 1200 kgf/mm. A rigidity ratio (G15/G55) of the flexural rigidity G15 and the flexural rigidity G55 is equal to or greater than 0.70 but equal to or less than 0.85.

Abstract: A racket frame 2 includes a body 4 and a first vibration-damping portion 6 fixed to the body 4. The body 4 includes a head 8, a shaft 12, a pair of throats 10 extending from the head 8 to the shaft 12, and a grip 14 connected to the shaft 12. The body 4 includes a second vibration-damping portion 18, and the material of the second vibration-damping portion 18 is different from the material of the first vibration-damping portion 6. The ratio (R2/R4) of a side pressure rigidity R2 to a throat rigidity R4 is 0.26 or greater, a moment of inertia around an axis at a position of 10 cm from a grip end is less than 300 kg·cm2, and a vibration damping rate in an out-of-plane secondary mode is equal to or greater than 0.70 but equal to or less than 1.0.

Abstract: A racquet identification system for use with at least first and second racquets supported by a multi-racquet support structure. Each of the first and second racquets includes a head portion. The system includes first and second head cards coupled to the head portion of the first and second racquets, respectively. The first and second head cards include first and second bodies and first and second projections extending from the first and second bodies, respectively. The shape of the first body is similar to the shape of the second body. The first body and the first projection define a first orientation. The second body and the second projection define a second orientation. The first and second orientations are different. The first and second racquets have at least one characteristic that varies between the first and second racquets, and the first and second projections are configured to highlight the characteristic.

Abstract: A racket frame 2 includes a head 4, a shaft 8, and a pair of throats 6 extending from the head 4 to the shaft 8. A flexural rigidity G15 of the throats 6 in a low load range (from 5 kgf to 15 kgf) is equal to or greater than 600 kgf/mm but equal to or less than 900 kgf/mm. A flexural rigidity G55 of the throats 6 in a high load range (from 45 kgf to 55 kgf) is equal to or greater than 900 kgf/mm but equal to or less than 1200 kgf/mm. A rigidity ratio (G15/G55) of the flexural rigidity G15 and the flexural rigidity G55 is equal to or greater than 0.70 but equal to or less than 0.85.

Abstract: A racket may include a frame including at least one prepreg layer. The at least one prepreg layer may include reinforcing fibers. The at least one prepreg layer may also include a matrix at least partially surrounding the reinforcing fibers. The at least one prepreg layer may also include graphene material.

Abstract: The inventive fiber manufacturing process is particularly adapted for demanding applications such as sports racquets, including tennis racquets, badminton racquets and other sports applications. Because of the improved strength to weight ratio of components formed using the inventive method, a wide range of flexibility is achieved, allowing use of the inventive process to manufacture, for example, a fiber reinforced (for example, graphite) modular sports racquet, optionally provided with user-selectable weights and/or handle replacements. From the standpoint of the player, this allows a racquet frame featuring self customization. From the standpoint of a retailer, the benefit provided is reduction of inventory. The inventive fiber, for example graphite fiber) racquet frame is filled with a plastic foam and is formed using, for example, microencapsulation technology to time, generate and apply the pressure used to form the graphite composite material of which the racquet is comprised.

Abstract: A racquet frame including a light-weight, semi-permanent protective layer covering portions of the racquet frame is described. The semi-permanent protective layer may be applied to significant portions of the racquet frame without substantially changing performance features of the racquet frame. The semi-permanent protective layer reduces cosmetic damage to the frame of the racquet and may be replaced from time to time as needed. Further, the protective layer can be graphically enhanced providing a level of graphical customization to the racquet frame.

Abstract: A racket frame 10 of the present invention includes fiber reinforced resinous layers. At least one of the fiber reinforced resinous layers is a layer (L1) in which a rubber component is blended. A matrix of the layer (L1) contains a rubber component. When a total weight of a matrix contained in the racket frame 10 is defined as Wm (g) and a total weight of the rubber component contained in the frame 10 is defined as Wg (g), a rate Rg (%) of the total weight Wg to the total weight Wm is 2.5(%) or greater and 17.5(%) or less. In this frame 10, a ratio [Rh/Rs] of plane rigidity Rh to throat rigidity Rs is 0.05 or greater and 0.2 or less. Preferably, the plane rigidity Rh is 30 (kgf/cm) or greater and 70 (kgf/cm) or less. Preferably, the throat rigidity Rs is 250 (kgf/cm) or greater and 800 (kgf/cm) or less.

Abstract: A tennis racquet frame including a handle, a rim and arms connecting the handle and the rim and wherein each arm includes two fingers extending one above and one below the rim when the racquet frame is laid flat on a support surface.

Abstract: A racket for ball games may include a frame which is formed by a frame profile or a hollow profile and has a racket head and a handle portion connected thereto preferably via a heart region. Two indentations that are symmetrical relative to the longitudinal axis of the racket may be provided in the heart region of the frame. A vibrating device may be arranged in each of the two indentations. The vibrating means of the racket may preferably be effective for vibrations having at least two vibration modes or degrees of freedom. Additionally or alternatively, a racket for ball games may include a frame which forms a head region for receiving strings and a handle portion for holding the racket. The frame may include one respective inwardly-facing C-profile in at least two segments of the head region.

Abstract: A sports racket is provided with a uniform elongated string bed, uniform main strings and cross strings segments, a uniform elongated sweet spot, a uniform head structure, robust yoke design, and handle.

Abstract: A racket including a string-stretching part for forming a ball-hitting face by tensionally mounting strings in string holes, formed through the string-stretching part, in which grommets are mounted respectively. As the grommets, a double-tubular grommet is mounted in at least one of the string holes. The double-tubular grommet is formed as an integrally molded article, including an inner tubular portion having a string insertion hole through which the string is inserted with the string in contact with the string insertion hole and pulled from an inward-end open portion thereof or an outward-end open portion thereof; an outer tubular portion fitted in the string hole formed through the string-stretching part with the outer tubular portion spaced at a certain interval from the inner tubular portion; and a base portion integrally connected with an outward-side end of the inner tubular portion and that of the outer tubular portion and disposed on a peripheral surface of the string-stretching part.

Abstract: A racket is described, with a center of gravity thereof being approximate to a center of a rubber sheet of the racket, and a center of gravity that moves approximately to the center of rubber sheet and is located in a high ball-strike area. The racket has a substantially triangular blade. The blade comprises a head, a neck and a handle. The head becomes gradually narrower from front to back of the head, and the handle can further be lightened. The center of gravity of the racket can thereby move forward to the center of the rubber sheet to enhance attack and defense abilities of the racket, and reduce shock.

Abstract: A tennis racket frame is composed of a laminate of prepregs each containing carbon fibers serving as a reinforcing fiber thereof. At least one part of layers of the laminate is formed as a hard layer consisting of a prepreg composed of the reinforcing carbon fibers and a hard carbon film (DLC film) formed on the surface of the carbon fibers.

Abstract: A racquet string includes a core component whose principal component is a synthetic fiber, and a surface resin component, wherein fullerenes or by-product carbon particles derived from manufacture of fullerenes are blended into the surface resin component, and wherein the blended percentage content is in a range of at least 0.01 wt % and at most 5.0 wt % of the entire string. The surface resin component may be formed as a sheath component by coating or by composite spinning. It is preferable that the amount of fullerenes or by-product carbon particles derived from the manufacture of fullerenes that is included in the surface resin component is in a range of at least 0.1 wt % and at most 25 wt %. Thus, the durability of the racquet string is improved without substantially changing its physical properties.

Abstract: A tennis racket having a racket frame defining a ball-hitting face, wherein if the upper part of the ball-hitting face is set as a 0-degree position, a string protection member is mounted on at least one portion of a head part of the racket frame in a range from a clockwise 45-degree position to a clockwise 135-degree position and in a range from a clockwise 225-degree position to a clockwise 315-degree position by interposing a viscoelastic member between the string protection member and the racket frame. The moment (Is) of inertia of the tennis racket in a swing direction is set to not less than 450,000 g/cm2 nor more than 490,000 g/cm2, when strings are not tensionally mounted thereon. The moment (Ic) of inertia of the tennis racket in a center direction is set to not less than 15,000 g/cm2 nor more than 19,000 g/cm2, when the strings are not tensionally mounted thereon.

Abstract: A reinforcing member for a badminton racquet wherein the racquet extends along a longitudinal axis and includes a frame having a tubular hoop portion supporting a string bed and a tubular handle portion. The reinforcing member includes a generally T-shaped body having first and second sections. The first section has an outer surface that defines a first cross-sectional area measured about a longitudinal plane positioned generally perpendicular to the string bed. The second section longitudinally and outwardly extends from the first section. The second section has an outer surface that defines a second cross-sectional area measured about a transverse plane. The first cross-sectional area is at least 50 percent greater than the second cross-sectional area. The first and second sections are configured for placement within the hoop and handle portions of the frame, respectively.

Abstract: A racket frame including a grip part, a shaft part, a throat part, and a head part formed hollowly with a fiber reinforced resin and having a weight not less than 100 g nor more than 270 g. The racket frame is provided with a dynamic damper comprising a mass member and a viscoelastic member mounted on a part of a peripheral surface of the mass member. The dynamic damper is mounted inside the grip part by fixing the viscoelastic member to a position of an inner wall of the grip part located within a range of 0.2 L from a free end of the grip part, supposing that a whole length of the racket frame is L in such a way that inside the grip part, at least one part of the mass member is shakable with respect to the inner wall of the grip part.

Abstract: A racquet for hitting a projectile has a stem, which is a handle or a shaft with a handle, and a racquet head with a frame extending from the handle and supporting a tensioned string bed defining a sweet spot. The frame has an upper portion on an opposing end of the frame relative to the handle and a longitudinal axis extending from the upper portion to the handle. The string bed includes main strings generally running parallel to the longitudinal axis and cross strings running generally perpendicular to the longitudinal axis. The string bed has an upper end defined at an interior surface of the upper portion and a lower end disposed at an interior surface of a lower end of the frame near the handle. A length is defined from the upper end to the lower end of the string bed. The cross strings are only disposed at most within approximately an upper 70% of the length of the string bed.

Abstract: A highly specific type of hooked materials, when applied to the shoulder of a tennis racquet, have been found to tangentially hook onto the nap of a tennis ball and allow the ball to be lifted from the court. Hooked materials characterized as comprising a series of heat-treated nylon monofilament hooks in a rowed relationship (300/inch2) of an average diameter of 8.5 mil, 1.91 mm mean height, 1.13 mm mean width and 0.71 mm mean hook depth are particularly effective for retrieving all common types of tennis balls.

Abstract: The present invention relates to an improved racket for ball games, in particular a tennis racket, squash racket, badminton racket, racquet ball racket or paddle tennis racket comprising a frame consisting of a racket head and a handle portion connected thereto and being formed of a frame profile, wherein the racket head defines a stringing plane. The frame profile comprises four trough-shaped depressions which are arranged opposite to one another in pairs and essentially symmetrical with respect to the longitudinal axis of the racket. The depressions are preferably formed in the area between two o'clock and four o'clock and/or eight o'clock and ten o'clock on the racket head. Particularly preferably, the positions are at about three o'clock and/or nine o'clock. The racket of the present invention thus exhibits particularly advantageous ball control characteristics.

Abstract: In a tennis racket having a racket frame composed of a fiber reinforced resin, the moment of inertia Ic of the tennis racket in a center direction thereof is set to not less than 13000 g·cm2 nor more than 17000 g·cm2, the moment of inertia Ig around a center of gravity thereof is set to not less than 80000 g·cm2 nor more than 200000 g·cm2, and the moments of inertia Ic and Ig are so set as to satisfy a relationship expressed by [30×(Ic)?(Ig)]/10000?31.

Abstract: A racket frame including a first laminate composed of a plurality of first prepregs consisting of fiber reinforced resin and a second prepreg, consisting of fiber reinforced resin, which is layered on the first laminate. The first laminate has a loss factor (=tan ?) set to not less than 0.005 nor more than 0.02, when the loss factor is measured at a temperature of 10° C. and a frequency of 10 Hz. The second prepreg has a loss factor (=tan ?) set to not less than 0.10 nor more than 0.50, when the loss factor is measured at a temperature of 10° C. and a frequency of 10 Hz.

Abstract: A racket includes a head and a shaft, a throat is connected between the head and the shaft. Shock absorbing members are installed to desired positions of the racket so as to reduce impact transferred to the player's hand. Two throat extensions extend from the head and two shaft extensions extend from an end of shaft. Each shaft extension has an insertion. The shock absorbing members are mounted onto the insertions and sandwiched between the throat extension and the insertions. A section of the shock absorbing members extends from an opening of the throat extensions and overlaps on an outer surface of the shaft extensions.

Abstract: The present invention relates to a racket for ball games, in particular a tennis racket, squash racket, badminton racket, racquet ball racket or paddle tennis racket comprising a frame consisting of a racket head and a handle portion connected thereto and being formed of a hollow profile. The hollow profile is formed by winding a plurality of web-like layers. On the racket head and/or in the heart region, the racket comprises at least one dampening layer being wrapped between the layers forming the hollow profile. The racket thus exhibits excellent dampening characteristics and can effectively minimize shock and/or vibration.

Abstract: A tennis racket frame (10), including a sleeve composed of a fiber reinforced resin, having a weight not less than 180 g nor more than 270 g, when strings are not mounted in a ball-hitting face thereof surrounded with a head part thereof. Supposing that the strings are not mounted in the ball-hitting face, a secondary natural frequency (F1) of the racket frame in an in-plane direction thereof is set to not less than 200 Hz nor more than 320 Hz, a secondary natural frequency (F2) thereof in an out-of-plane direction thereof is set to not less than 480 Hz nor more than 650 Hz, and F1/F2 is set to not less than 0.3 nor more than 0.6.

Abstract: The present invention relates to a racket, in particular a tennis racket or squash racket exhibiting a particularly suitable stiffness and/or strength behavior. For this purpose, the ball game racket of the present invention comprises a racket head, a heart region and a handle portion which together form the frame, wherein in the area of the racket head individual regions are formed which comprise brackets being arranged along the frame in the head region of the racket.

Abstract: A racket frame (10) including a laminate having not less than two fiber reinforced resinous layers layered one upon another and one or more modified fiber reinforced resinous layers (20) each containing a modified resinous composition, as a matrix resin, having a loss factor (=tan ?) not less than 0.5 nor more than 3.0, when the loss factor is measured at a temperature of 0° C. to 10° C. and a frequency of 10 Hz. A weight of the modified fiber reinforced resinous layers (20) is set to not less than 1% nor more than 10% of a weight of the fiber reinforced resinous layers.

Abstract: The present invention relates to an improved racket for ball games, in particular a tennis racket, squash racket, badminton racket, racquet ball racket or paddle tennis racket, comprising a frame consisting of a racket head and a handle portion connected thereto and being formed of a frame profile, wherein the racket head defines a stringing plane. The frame profile comprises at least one opening extending through the frame profile essentially perpendicular with respect to the stringing plane of the racket. Preferably, at least two openings of this kind are provided essentially symmetrical with respect to the longitudinal axis of the racket at about two o'clock to four o'clock and/or eight o'clock to ten o'clock on the racket head. Particularly preferably, the openings are at about three o'clock and/or nine o'clock. The racket of the present invention thus exhibits particularly advantageous ball control characteristics.

Abstract: A sports racquet comprises a handle and a frame coupled to the handle. The frame includes an inner portion and an outer portion located substantially opposite the inner portion. The inner portion of the frame include a plurality of undulations that extend towards and away from a ball-hitting surface, the undulations reducing the unintended bunching and wrinkling of material that intermittently forms in the frame during the manufacturing process. The undulations can be varied by location, undulation length, undulation height, and frequency and can be used in racquets made from a variety of materials and methods.

Abstract: A tennis racquet apparatus comprises a handle integral with a neck and a frame, the frame strung to define a face of the racquet. A weighting device engaged with or within the frame, neck or handle, is in a position for urging the face of the racquet into a vertical attitude relative to a ground surface when the handle of the racquet is near horizontal. The weighting device may be a solid, a granulate or a liquid and of such consistency as to flow to the lowest point of the racquet.

Abstract: A racket frame (1) has a pipe-shaped racket-frame body (2) made of a fiber reinforced resin and composed of a head (3), a throat part (4), a shaft part (5), and a grip part (6) sequentially arranged and a yoke (10) connected to the racket-frame body (2). In this construction, supposing that the head (3) is a clock face and that the top position of the head (3) is 12 o'clock, a yoke rigidity value at a central position P1, vertical to a ball-hitting face (F), of the yoke (10) in a longitudinal direction thereof is in a range of 10% to 70% of a face rigidity value which is an average of a rigidity value at a 12 o'clock position (P2) vertical to the ball-hitting face (F) and a rigidity value at a three o'clock position (P3) vertical to the ball-hitting face (F).

Abstract: A frame body (2) is formed separately from a yoke (10) connecting right and left parts of the frame body (2) to each other. The yoke (10) and the frame body (2) are connected to each other by a mechanical connection means, with both ends of the yoke (10) in contact with the right and left parts of the frame body (2) in an area of not less than 10 cm2 (1.6 in2). A shear force generated when the racket frame (1) deforms is collectively applied to a connection surface of the frame body (2) and that of the yoke (10) to increase a vibration-damping performance of the racket frame (1).

Abstract: A racket comprising a frame body having a face portion, a shaft portion, and a grip portion, and a groove in the length of 10% to 20% against the entire circumference of the frame comprising the face portion provided at two portions covering maximum width points of the frame comprising the face portion and a closed tube enclosing a slidable weight weighing 2 g to 10 g is embedded in the groove.

Abstract: An embedded dynamic vibration absorber that includes an external structural portion and a vibrational absorbing portion. The vibrational absorbing portion is encompassed or surrounded by the external structural portion.