422 results about "Ball tennis" patented technology

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

A baseball training device includes a target net from which balls will be fed to a unit that will throw the balls back to a player. The unit can be set to throw the balls in the air or on the ground so a variety of situations can be practiced.

A tennis training device for training a user proper tennis strokes with a means for attaching the tennis training device to an upper arm of a tennis player, a means for connecting the means for attaching to a tennis racquet, and a means for restricting the position of the tennis racquet in relation to the tennis player.

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 relates to a ball serving device, in particular to a ball serving device for tennis sports. In order to achieve the purposes that the manufacturing cost is low, the tennis send-out anglecan be adjusted, a lot of balls can be put together, it is not required that the balls are put one by one, and time and labor are saved, the ball serving device for the tennis sports comprises an adjusting device which comprises a vertical rod and the like; a cross plate is arranged on the lower portion of a bottom plate, the vertical rod is installed on the left side of on the top of the cross plate, a rotating block is installed at the top of the vertical rod in a pin connection mode, the top of the rotating block is connected with the left side on the bottom of the bottom plate, a bearingpedestal is installed on the right side on the top of the cross plate, a nut is installed on the top of the bearing pedestal, the nut is connected with a bearing in the bearing pedestal, and fixing blocks are symmetrically installed on the left and right sides on the outer side surface of the nut. According to the ball serving device for the tennis sports, through a reminding device, people can bereminded that the balls are immediately sent out, so that people are prevented from being damaged; and due to the arrangement of the adjusting device, the tennis send-out angle can be adjusted.

A tennis training aid can be used to teach proper wrist and racket position for swings such as a forehand ground stroke, two-handed backhand stroke, or volley. A training aid includes a forearm attachment member that can be quickly and easily attached to a player's forearm. A wrist positioning member can be attached between the forearm attachment member and the player's racket to maintain proper wrist angle and racket position. A first wrist positioning member can be used for a forehand ground stroke or two-handed backhand stroke, while a second wrist positioning member can be used for volleys. The forearm attachment member can include a rotatable member, and the wrist positioning member can be slightly elastic, in order to allow the racket to move slightly with respect to the wrist, and to allow for slight wrist movement, in order to provide a natural feel for the player.

A portable tennis backboard that can be made to be foldable and formed by two vertical modules.