A dart including a shaft, a flight, and a cap. The shaft has a body made of flexible materials and a connecting element. The connecting element has a connecting section and multiple insertion slits. Each one of the multiple insertion slits has an open end. The flight has multiple wings and a receiving groove. Each one of the multiple wings is inserted into a respective one of the multiple insertion slits. The receiving groove is formed through the multiple wings. The cap is detachably mounted in the receiving groove, is mounted to the connecting section, and blocks the open end of each one of the multiple insertion slits.

A new dart has an integrally formed flight part that is made of thin plastic with a uniform thickness. The flight part has a set of flexible blades that are radially offset, with the width of each blades being coplanar, and extending perpendicular to the longitudinal axis of a stem on which a barrel and dart tip are connected. Edges on a central portion of the flight part engage cooperating surfaces on a retainer, locking the retainer and the flight part against rotation with respect to each other. A self-lubricating bearing fits over the a stem and is used to connect to the flight part and the retainer for rotation with respect to a barrel and dart tip. A channel extends along the length of each blade. A bubble is positioned outwardly of the channel.

A toy dart includes a deformable cap that safely impacts a target. The cap includes two layers of openings that provide spaces that allow the cap to deform. The lower layer, having two openings, is supported by exterior posts and an interior wall between the two openings. The upper layer, having two openings, is supported by exterior posts and an interior wall that is laterally offset from the interior wall of the lower layer. The upper and lower layers are separated vertically by a substantially flat divider. The upper layer is more rigid than the lower layer such that the lower layer of the cap deforms more than the upper layer of the cap upon initial impact with the target.

A weight adjustable javelin includes an elongated shaft having a leading end and a trailing end. A nose piece includes a conical shape, a nose tip, a nose base, and an internal nose slot defined along a longitudinal axis of the nose piece. The nose base includes an opening leading into the internal nose slot. A tail piece includes a tail tip, a tail base, and an internal tail slot defined along a longitudinal axis of the tail piece. The tail base includes an opening leading into the internal tail slot. The nose base is releasably secured to the leading end of the elongated shaft. The tail base is releasably secured to the trailing end of the elongated shaft. The internal nose slot and the internal tail slot are configured to receive and retain different sized and weighted rods therein.

A weight adjustable javelin includes an elongated shaft having a leading end and a trailing end. A nose piece includes a conical shape, a nose tip, a nose base, and an internal nose slot defined along a longitudinal axis of the nose piece. The nose base includes an opening leading into the internal nose slot. A tail piece includes a tail tip, a tail base, and an internal tail slot defined along a longitudinal axis of the tail piece. The tail base includes an opening leading into the internal tail slot. The nose base is releasably secured to the leading end of the elongated shaft. The tail base is releasably secured to the trailing end of the elongated shaft. The internal nose slot and the internal tail slot are configured to receive and retain different sized and weighted rods therein.

A dart game apparatus 100 is provided with: a dart board in which a dart can stick and a plurality of segments are demarcated; a first detecting part 100 that detects a position of a point where the dart stuck in the dart board; a second detecting part 102 that detects a segment of the point where the dart stuck from the plurality of segments; a correcting part 104 that corrects the position detected by the first detecting part 100 based on the segment detected by the second detecting part 102 if a segment corresponding to the position detected by the first detecting part 100 is different from the segment detected by the second detecting part 102; and an outputting part 106 that output the position detecting by the first detecting part 100 or position corrected by the correcting part 104.

A threaded member has a discontinuous helical thread ridge 15 on which a plurality of dividing portions 14 are formed in the middle. At least one of the discontinuous portions of the thread ridge 15, which is interposed between the dividing portions 14, is a locking portion 18 which is configured such that a flank angle of one flank, out of flanks on both sides of the thread ridge 15, is smaller than a flank angle of a flank corresponding to a basic ridge profile and at least part of the flank is disposed on an outside of the flank corresponding to the basic ridge profile.

A threaded member has a discontinuous helical thread ridge 15 on which a plurality of dividing portions 14 are formed in the middle. At least one of the discontinuous portions of the thread ridge 15, which is interposed between the dividing portions 14, is a locking portion 18 which is configured such that a flank angle of one flank, out of flanks on both sides of the thread ridge 15, is smaller than a flank angle of a flank corresponding to a basic ridge profile and at least part of the flank is disposed on an outside of the flank corresponding to the basic ridge profile.

[The present invention is] a dart game apparatus that provides a dart game in which one player successively throws n number of (n=3 or 4) darts D at a dart board 12, having: light sources LS that are disposed around the dart board 12 and emit lights L along the board face of the dart board 12; a plurality of photo-sensors S that are disposed around the dart board 12 at approximately the same height from the dart board 12 in the board thickness direction, and detect the brightness of the lights L emitted from the light sources LS; and a processor that calculates a hit position of a dart D in the dart board 12 based on the brightness of each light. A number of photo-sensors S is n2.

Cognitive training handle designed to be connected by a longitudinal connecting means to a connection means on a ball, said handle also comprising a means for adjusting the length of said longitudinal connecting means.