540 results about "Tennis racket" patented technology

Provided is a swing speed analyzer for mounting on a swinging implement and comprising a first accelerometer, a processor and a shock attenuator. The processor uses an output from the first accelerometer to compute a swing speed of the swinging implement. The shock attenuator is comprised of a material that is sized and dimensioned to dampen an impact shock wave by more than 50% at 125 Hz. The material is preferably sized and dimensioned to dampen the impact shock wave from more than 1000 g to less than 500 g. Suitable attenuators can include viscoelastomeric materials such as foam. The swing speed analyzer can advantageously include any of a releasable attachment mechanism, a liquid crystal or other visual display, a second accelerometer, and a strain gauge. The analyzer can advantageously be attached to a golf club, a tennis racket, a baseball bat, or a hockey stick.

The present application relates to devices and methods for adjusting the weight of a racket using variably weighted racket damping devices.

The invention relates to a cooperative construction method for enhancing a realistic table-tennis system based on real rackets. The method comprises the following steps of: detecting and tracking a real table-tennis racket by utilizing the color characteristics according to a video image acquired by the system; designing and realizing the virtual-real three-dimensional registration of a virtual scene and a real scene, mapping the virtual scene to a video image coordinate system of the real rackets, participator users and real environment; designing and realizing the collision detection between a virtual table-tennis ball and objects, such as the real rackets, a virtual table-tennis table, a virtual table-tennis net, and the like according to the motion information of the real rackets and confirming and representing the motion trajectory of the virtual table-tennis ball after collision; and providing a finite state machine and a message-processing mechanism, controlling the conversion of various states of the table-tennis system in the operation process and ensuring a plurality of users to have the same table-tennis motion experience. The cooperative construction method can be widely applied to the fields, such as interactive digital entertainment, sports research, training simulation, remote education and training, and the like.

An improved ball rebound device which will deliver a playground type ball such as a soccer ball, basketball, or kick ball which is propelled against the device, back to the user with surprising speed and distance. This ball rebound device utilizes a series of monofilament nylon elastic cords which are independently stung back and forth in a basket-weave fashion within a rectangular frame as a tennis racket is strung. This enables the device to more efficiently convert the kinetic energy of the ball into a powerful rebound back to the user. One embodiment of the device has within its frame the capability for adjustment of the tension of the cords to keep them operating at the desired tension. Another embodiment of the device has the capability for its frame to be adjustably oriented at various angles to the user to better suit the individual practice needs of the user.

A swing analyzing apparatus 2 includes:

a three-axis acceleration sensor 28 attached to a tennis racket, for measuring accelerations in the directions of three axes when a swing for hitting a tennis ball is taken with the tennis racket;

a three-axis gyro sensor 30 attached to the tennis racket, for measuring angular speeds about the three axes; and

an analyzing device 8. The analyzing device 8 has a receiving function to receive data regarding the accelerations and the angular speeds from the three-axis acceleration sensor 28 and the three-axis gyro sensor 30; a coordinate axis conversion function to convert relative coordinate axes that are the three axes for the accelerations into absolute coordinate axes on the basis of the angular speeds; and a calculation function to calculate an index of the swing on the basis of accelerations resulting from the coordinate axis conversion.

A tennis racket including a vibration damping member located in the vicinity of a position of a racket frame at which a large amplitude is generated when the tennis racket hits a tennis ball. The vibration damping member includes a mass adding part, such as a bracket assembly, having a portion extending in a widthwise direction of the tennis racket and a portion extending in a thickness direction thereof such that both portions are either integral or unintegral with each other; a viscoelastic material; a spring; or/and a damper each for connecting the mass adding part to the racket frame. The vibration damping member absorbs a vibration in an in-plane and an out-of-plane direction of the racket frame, and longitudinal and rotational impacts to be applied to a handle portion of the tennis racket.

Composite synthetic string, in particular for a tennis racket. According to the invention, the string is made up of central monofilaments surrounded by mono-filament threads and by multifilament threads, the assembly being impregnated and covered in polyurethane. The string is applicable to tennis rackets having increased lifetime and that react in lively manner under the impact of a ball.

The invention discloses a black table tennis racket inverted rubber composition with high viscosity and high elasticity. The composition comprises a matrix material composed of a blend of 50-100 parts by mass of a natural rubber and 0-50 parts by mass of a butadiene rubber, 1-3 parts by mass of an anti-aging agent, 1-10 parts by mass of a filler, 6-13 parts by mass of a vulcanizing activator, 1-5 parts by mass of a vulcanizing accelerator, 0.5-3.5 parts by mass of sulfur and 10-30 parts by mass of a tackifier. The composition is simple in preparation process and low in cost; the prepared table tennis racket inverted rubber has good rebound resilience and relatively high viscosity that can be kept for a long time, thereby guaranteeing fast tennis ball speed, high rotation ball-making efficiency and high control ability for the tennis balls; and at the same time, the rubber has smooth appearance without blooming phenomenon, so that the table tennis racket can be well balanced in both performance and appearance and be beneficial to athlete health.

A pliable handle includes a core member, an outer sheath, and gel disposed between the core member and the outer sheath. There is an outer annular flange around its top. The outer sheath has an opening on its top and a closed bottom, an inner annular flange on its top; and the outer sheath is disposed about the core member. Below the inner annular flange of the outer sheath and the outer annular flange of the core member define the gap portion, which is filled with gel. There is an annular flange which corresponds with the annular groove on the core member below the inner annular flange of the outer sheath. The present pliable handle can be secured to walking sticks, golf clubs, ski poles, tennis rackets, battledores, and umbrellas.

A sports training device that includes a pressure sensor mounted on the hand grip of a sports implement such as a tennis racket or a golf club. The device utilizes a piezoelectric force sensor to monitor the grip pressure in a circular sensing area located where the palm meets the index finger. The piezoelectric sensor varies its resistance inversely with the force applied and is connected to an operational amplifier that uses a variable resistor to deliver an output voltage proportional to the force applied. This voltage triggers a vibrating motor that alerts the user that an excessive pressure has been applied to the hand grip. The exact amount of pressure for each player and the sports equipment used will vary but can be adjusted to signal when the pressure is too great for the particular use.

It relates to a dual acting hammer modified from ordinary hammers. It comprises the hammer head and hammer handle, with the head contained with sealed and movable blocks. It features in the once time for time hammering with improved hammering effect, being more accurate, reduced or illuminated vibration resulted from counteraction, simple structure, same shape with the ordinary hammer after quick resetting of blocks. It can be used for hammering tools like hack, handle axe, axe, tennis racket, and golf pole and so on.

The present invention relates to a training grip for a tennis racket. The training grip has a series of protrusions and recesses that receive a user's hand and place it in proper position for a particular grip type. The present invention, in one embodiment, includes a universal training grip that allows the grip to be used for more than one grip type. The present invention includes methods, systems and kits that encompass such a tennis training grip.

The invention refers to a tennis swing analyzing device which is used for knocking down a ground ball, intercepting or serving a ball. The swing analyzing apparatus includes: a three-axis acceleration sensor attached to a tennis racket including a handle and a head, for measuring accelerations in the directions of three axes when a swing for hitting a tennis ball is taken with the tennis racket; a three-axis gyro sensor attached to the tennis racket, for measuring angular speeds about the three axes when a swing for hitting a tennis ball is taken; and an analyzing device. The analyzing device has a receiving function to receive data regarding the accelerations and the angular speeds from the three-axis acceleration sensor and the three-axis gyro sensor; a coordinate axis conversion function to convert relative coordinate axes that are the three axes for the accelerations into absolute coordinate axes on the basis of the angular speeds; and a calculation function to calculate an index of the swing on the basis of accelerations resulting from the coordinate axis conversion.

An aid for teaching players specific proper tennis grips is provided in two form factors. The aid can be provided in a wrap or a band form factor. The aid comprises a reference for each of the following grips: Continental, Eastern, Semi-Western, and Western. The references are spatially located on the aid, such that when installed onto a neck of a tennis racket, each reference aligns with the “V” formed between player's thumb and forefinger when holding the racket with the respective grip. The references can be color coded, provided in differing fonts, include unique graphical representations, and the like.

A tennis racket includes a frame that surrounds a hitting face for hitting a ball, wherein a foam material is provided inside two side portions of the frame on opposite sides of a predetermined area of the hitting face, and the two side portions of the frame have a strength that is higher than a strength of another portion of the frame.

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. This compares to the standard industry technique of air injection. The racquet is thus not hollow like conventional graphite racquets, and the walls therefore can be made thinner than those of existing graphite racquets still being of the same strength or being stronger, which gives the racquet exceptional performance. In addition, the overall dimensions of, for example the cross-section, of the racquet can also be reduced while still maintaining performance characteristics.