Provided is a screen badminton practice device enabling badminton, even while alone, to be played like a real game or practiced, and enabling shuttlecocks to be automatically collected and loaded, the screen badminton practice device comprising: a screen provided at one side of a practice location; a beam projector for projecting an image on the screen; a shuttlecock shooting part, which is provided at the rear of the screen, has a storage container, provided at the upper part thereof, for storing a plurality of shuttlecocks, and withdraws and shoots the shuttlecocks stored in the storage container; and a shuttlecock collection part collecting the shuttlecocks, which fall on the lower part of the practice location, so as to fill the storage container with the same.

Footwear, sports equipment, weapons, gloves, vehicle controls, floor surfaces, and vehicle tires three dimensionally imprinted with friction ridge patterns derived from individuals.

A presentation method includes performing analysis on a swing by using output data from an inertial sensor measuring the swing of an exercise appliance, finishing the analysis, and presenting analysis information based on at least one preset index regarding the swing, on the basis of finishing of the analysis.

The scorekeeping system includes a plurality of scoring elements. An upper bracket can be secured a first string having a first portion of the plurality scoring elements and a second string having a second portion of the plurality of scoring elements. The first string can have a first thread and a second thread, each of the first thread and the second thread being threaded through the first portion of the plurality of the scoring elements. The second string can have a third thread and a fourth thread, each of the third thread and fourth thread being threaded through the second portion of the plurality of the scoring elements.

To improve repulsion performance when a ball is hit by a racket. Grommets each include a strip-shaped portion and a cylinder portion protruding from one surface of the strip-shaped portion. The cylinder portion includes a plurality of ribs extending along an extending direction of a central axis of a cylinder main body. The plurality of ribs is constituted of first ribs protruding from an outer peripheral surface of the cylinder main body toward both sides in the extending direction of the strip-shaped portion, and second ribs protruding from the outer peripheral surface of the cylinder main body toward both sides in a direction orthogonal to the extending direction of the strip-shaped portion. Two or more of the first ribs are formed on each of the both sides in the extending direction of the strip-shaped portion, and one or more of the second ribs are formed on each of the both sides in the direction orthogonal to the extending direction of the strip-shaped portion.

Provided is an apparatus, method, and system for simulating a defender of a sport activity.

A ball game racket frame includes a head portion, a grip portion and a shaft portion which connects the grip portion and the head portion. The ball game racket frame is at least partially made of at least one layer of a plurality of fibers which are randomly orientated and intertwined within the layer. According to further aspects, a ball game racket includes the ball game racket frame according to any of the embodiments described herein and a string bed plane comprising a plurality of strings which are attached to at least a portion of the head portion of the ball game racket frame. The string bed plane provides at least one striking surface for striking a game ball. According to yet further aspects, a method for manufacturing a ball game racket frame is disclosed.

A mold for manufacturing an artificial shuttlecock from a semi-finished shuttlecock includes a male mold and a female mold. The male mold includes a cone frustum and a plurality of first annular grooves. The semi-finished shuttlecock is placed on an outside of the cone frustum. The first annular grooves are disposed apart on the outside of the cone frustum. The female mold includes a tapered slot, a plurality of second annular grooves and an injection channel. The second annular grooves are disposed apart on an inner surface of the tapered slot. When the semi-finished shuttlecock and the male mold are placed into the female mold, each of the first annular grooves corresponds to each of the second annular grooves to form a plurality of molded grooves. The injection channel communicates with the second annular grooves, and the molded grooves communicate with the injection channel through the second annular grooves.

A striking subassembly has lower and upper components. The lower component has a hemispherical lower section and a cylindrical upper section. A chamber within the lower component terminates above with an annular projection. The upper component has upper and lower disks. An annular recess is between the upper and lower disks offset from the annular projection. Feathers extend upwardly from the upper disk. An electrical assembly has a printed circuit board with a periphery. The periphery is secured within the chamber to the upper component. A light emitting diode extends downwardly from the printed circuit board. A battery powers the light emitting diode.

Methods, apparatus and kits for modifying natural feathers that are used in sporting goods that result in long lasting feathers with increased mechanical stability, reliability and durability as well as improved flight consistency is disclosed. Some of the sporting goods that use natural feathers are badminton shuttlecocks, arrow fletchings, and darts. The disclosed methods consist of controlled treatment of feather shuttlecocks with crosslinking agents to crosslink the keratin protein present on the natural feathers of the shuttlecock.