WO2024252573A1 - Fléchette - Google Patents

Fléchette Download PDF

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Publication number
WO2024252573A1
WO2024252573A1 PCT/JP2023/021205 JP2023021205W WO2024252573A1 WO 2024252573 A1 WO2024252573 A1 WO 2024252573A1 JP 2023021205 W JP2023021205 W JP 2023021205W WO 2024252573 A1 WO2024252573 A1 WO 2024252573A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
dart
flights
barrel
tip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/021205
Other languages
English (en)
Japanese (ja)
Inventor
正和 福永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Felix Corp
Original Assignee
Felix Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Felix Corp filed Critical Felix Corp
Priority to US18/856,148 priority Critical patent/US20250271244A1/en
Priority to EP23804884.7A priority patent/EP4725566A4/fr
Priority to PCT/JP2023/021205 priority patent/WO2024252573A1/fr
Priority to CA3245929A priority patent/CA3245929A1/en
Priority to JP2023571226A priority patent/JP7588908B1/ja
Priority to CN202380012013.8A priority patent/CN119451731A/zh
Publication of WO2024252573A1 publication Critical patent/WO2024252573A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B6/00—Projectiles or missiles specially adapted for projection without use of explosive or combustible propellant charge, e.g. for blow guns, bows or crossbows, hand-held spring or air guns
    • F42B6/003—Darts

Definitions

  • the present invention relates to darts, which are used as a sports toy in which players compete for points by throwing darts at a target (dart board) installed on a wall or other object.
  • Darts has developed widely as a sport where players compete for points, with professional competitions also taking place. Specifically, darts are thrown at a target, and the competition is based on how many darts can be thrown into the center of the target. Therefore, it is a sport where players are required to focus as much as possible on hitting the center of the target.
  • Darts disclosed in, for example, Patent Documents 1 to 3 are known in the art, but when such darts are thrown, the next dart is thrown after the first dart has already struck the target, so the dart thrown later collides with the dart already struck in the target and is bounced off, which means that the darts do not strike the same position. Also, the darts that have already struck the target may be bounced off and leave the target. Therefore, the present inventors proposed the dart disclosed in Patent Document 4.
  • JP 2011-110413 A Patent No. 5432785 Utility Model Registration No. 3160281 Patent No. 5748345
  • the above-mentioned darts can prevent a later thrown dart from colliding with a dart already stuck in the target and being knocked away, or a later thrown dart from knocking the dart off the target, more than ever before, but further improvements are desired.
  • the present invention was made in consideration of these circumstances, and aims to provide a dart that can suppress or even prevent a dart thrown later from colliding with a dart already stuck in the target and being knocked away, or a dart that has already stuck in the target from being knocked away by a dart thrown later, more than ever before.
  • the dart according to the present invention which is in accordance with the above-mentioned object, is a dart which is provided with a tip, a barrel, and a shaft in this order from the tip side to the base side,
  • the shaft is gradually tapered from the tip to the base, and three flights are attached and fixed to the base of the shaft at equal angular positions around the axis of the shaft, and the base sides of the flights protrude from the shaft and are connected to each other,
  • a groove is formed in the shaft between adjacent flights in the circumferential direction of the shaft, and the inner width of the groove gradually increases from the flight side toward the axial center of the shaft and gradually decreases from the axial center of the shaft toward the barrel side.
  • the shaft is gradually tapered from the tip to the base, and the base sides of the flights protrude from the shaft and are connected to each other, so that a dart thrown later is less likely to collide with the shaft of a dart that has already hit the target, and even if a collision does occur, the two darts can slip through each other smoothly.
  • the shaft has grooves between adjacent flights in the circumferential direction, and by making the number of flights three, the cross-sectional area per groove (area on a surface perpendicular to the shaft axis) can be made larger than when the number of flights is four, further enhancing the above-mentioned effects.
  • the inner width of the groove gradually widens and then gradually narrows from the flight side to the barrel side in the shaft axis direction, so that the strength of the shaft is not impaired, and even if the tip of a dart thrown later collides with a dart already stuck in the target, it can smoothly slip through.
  • the depth of the groove gradually becomes deeper from the flight side toward the center in the axial direction of the shaft, and gradually becomes shallower from the center in the axial direction of the shaft toward the barrel side. It is also preferable that the three grooves have the same shape and are formed at equiangular positions about the axis of the shaft. Furthermore, the shaft may be detachably attached to the barrel.
  • the dart of the present invention for example, when throwing multiple darts in succession, makes it difficult for the later-thrown dart to collide with the flight of the dart that has already hit the target, and even if the tip of the later-thrown dart collides with the dart that has already hit the target, it can smoothly pass through. Therefore, compared to conventional darts, the dart thrown later can strike the target at a position close to the dart that has already struck the target without being knocked away by the dart that has already struck the target. Alternatively, the dart that has already struck the target can be prevented from being knocked away by the dart thrown later and leaving the target, which makes it possible to score higher in competitions.
  • FIG. 1 is a plan view of a dart according to an embodiment of the present invention.
  • FIG. 2 is a front view of the shaft and flight of the dart.
  • FIG. 2 is a bottom view of the shaft and the flight.
  • FIG. 2 is a right side view of the shaft and the flight. This is a cross-sectional view taken along line AA in FIG.
  • a dart 10 according to one embodiment of the present invention comprises, from the tip (front) to the base (rear), a tip (also called a point) 11, a barrel 12, and a shaft 13, in that order, and a flight 14 is attached and fixed to the base side of the shaft 13.
  • a tip also called a point
  • a flight 14 is attached and fixed to the base side of the shaft 13.
  • the tip 11 is provided at the axial end of the dart 10 and is the part that is thrust into the target.
  • the tip 11 is made of, for example, metal or plastic, and can be attached to and detached from the barrel 12 (replaceable) by a screw portion or the like (not shown).
  • the barrel 12 is provided at the center of the dart 10 in the axial direction, and when throwing the dart 10, it is common to hold this barrel 12.
  • the barrel 12 is mainly made of metal, and is heavy, which is effective for throwing the dart 10 farther.
  • the barrel 12 can be made of various materials, such as brass, nickel alloy, and tungsten alloy, but those made of tungsten alloy or nickel alloy, which have a higher specific gravity, are thinner and less likely to interfere when hitting the target.
  • the barrels 12 are various in shape, non-slip markings, weight, etc.
  • the shaft 13 is provided at the base of the dart 10 in the axial direction, and the flight 14 is attached and fixed to the base side of the shaft 13, which is the part that exerts the effect of making the dart 10 fly straight.
  • the flight 14 is the part that becomes the wing.
  • the shaft 13 has a circular cross section, and gradually decreases in diameter (tapered) from the tip to the base in the axial direction, and can be attached and fixed (replaceable) by screwing it into the base end of the barrel 12 using a threaded portion (male thread) 15 provided at the tip.
  • the maximum diameter D of the shaft 13 is, for example, about 4.5 mm to 6.5 mm, and the length L1 of the shaft 13 in the axial direction (length excluding the threaded portion 15) is, for example, about 45 mm to 60 mm, but is not particularly limited.
  • the material of the shaft 13 may be various, such as metal, resin (plastic), polycarbonate, carbon composite, etc., and is not particularly limited as long as it can exhibit the above-mentioned effects, but it is preferable to use a polyamide-based resin.
  • This polyamide-based resin has an amide bond, and is composed mainly of, for example, amino acid, lactam, or diamine and dicarboxylic acid.
  • the shaft 13 and the flights 14 are preferably integrally molded (integrally structured) by injection molding using the same resin material, but the shaft and the flights can also be molded separately and then assembled. In this case, a slit is made in the base side of the shaft, and the flights can be inserted into the slit to attach and fix them.
  • the materials of the shaft and the flights may be the same or different.
  • equiangular positions refer to positions spaced 120 degrees apart around the axis of the shaft 13, but even if there is a deviation within a range of about ⁇ 1 degree (a range of 119 degrees to 121 degrees) due to manufacturing errors or the like, these positions are considered equiangular positions.
  • the tips of the flights 14 are attached and fixed to the outer periphery of the shaft 13 from the center to the base side in the axial direction, and the base sides of the flights 14 protrude outward (rearward) from the shaft 13 in the axial direction of the base side and are connected to each other.
  • the three flights 14 are arranged radially around the axial center of the dart 10.
  • the attachment length of the flight 14 relative to the shaft 13 is, for example, approximately 50% to 80% (preferably 60% or more) of the length L2 of the flight 14 along the axial direction of the shaft 13, the height H of the flight 14 relative to the axial center of the shaft 13 is approximately 15 mm to 25 mm, and the length L3 of the shaft 13 in the axial direction where the flight 14 is not attached is approximately 20 mm to 30 mm, but is not particularly limited.
  • the three flights 14 have the same shape, and can be shaped, for example, standard, shaped (hallows shape), kite, teardrop, slim, etc., and the outer peripheral contour of each flight 14 is formed, as shown in Fig. 2, by a curved surface that extends from the tip side to the base side along the axial direction of the shaft 13, and includes a tip side slope 16 having a gentle inclination angle and a base side slope 17 having a steeper inclination angle than the tip side slope 16.
  • the radius of curvature R1 of the rising portion that constitutes the tip side slope 16 is about 8 mm to 13 mm
  • the base side slope 17 rises at an angle of about 58 degrees to 65 degrees with respect to the axial center
  • the radii of curvature R2, R3, and R4 from the tip side slope 16 to the base side slope 17 are, but are not particularly limited to, R2 being about 17 mm to 21 mm, R3 being larger than R2 and about 27 mm to 33 mm, and R4 being smaller than R2 and about 4 mm to 7 mm.
  • the thickness of the flight 14 is usually about 0.3 mm to 0.5 mm
  • the length L4 to the base end of the flight 14, including the length L1 of the shaft 13, is, for example, about 65 mm to 75 mm, but is not particularly limited.
  • Grooves 18 are formed on the shaft 13 between flights 14 adjacent to each other in the circumferential direction of the shaft 13. Each groove 18 is formed at an equal angular position centered on the axis of the shaft 13.
  • the equal angular positions refer to positions spaced at intervals of 120 degrees centered on the axis of the shaft 13, but even if there is a deviation within a range of about ⁇ 1 degree (a range of 119 degrees to 121 degrees) due to manufacturing errors or the like, these positions are included in the equal angular positions.
  • the shape, inner width and depth of the groove 18 are set so that a later thrown dart 10 can smoothly slip through even if it collides with the dart 10 stuck in the target, without impairing the strength of the shaft 13.
  • the three grooves 18 have the same shape, and their inner widths gradually become wider (inversely tapered) from the flight 14 side (the position where the three flights 14 are connected to one another) toward the axial center of the shaft 13, and gradually become narrower (tapered) from the axial center of the shaft 13 toward the barrel 12 side (in a region in the axial direction of the shaft 13 where no flights 14 exist). Also, the depth of each groove 18 gradually becomes deeper from the flight 14 side toward the axial center of the shaft 13, and gradually becomes shallower from the axial center of the shaft 13 toward the barrel 12 side (in a region in the axial direction of the shaft 13 where no flights 14 exist).
  • the barrel 12 side end and flight 14 side end of the groove 18 are each acute-angled (V-shaped).
  • the position where the inner width of the groove 18 is maximum is on the barrel 12 side (a region where the flight 14 does not exist in the axial direction of the shaft 13) at the center of the shaft 13, so the flight 14 side end of the groove 18 is more pointed (has a more acute angle) than the barrel 12 side end.
  • the maximum inner width of the groove 18 is, for example, about 3 mm to 5 mm, but is not particularly limited. 4 and 5, the bottom surface of groove 18 has an arc-shaped cross section (curved line: for example, a radius of curvature of about 0.4 mm to 0.6 mm).
  • the position where groove 18 has the greatest depth is the center in the axial direction of shaft 13 and on the barrel 12 side (a region in the axial direction of shaft 13 where no flight 14 exists).
  • the position where the inner width of the groove 18 is maximum and the position where the depth is maximum are the same, but may be different.
  • the dart 10 has three flights 14, the shaft 13 is gradually tapered from the tip to the base, and the grooves 18 are formed between adjacent flights 14 in the circumferential direction of the shaft 13. Therefore, when multiple darts 10 are thrown in succession, the tip 11 of the dart 10 thrown later will not collide with the base end of the shaft 13 of the dart 10 that has struck the target, causing the dart 10 thrown later to be knocked away, but will instead stick close to the dart 10 that has struck the target. Also, it is possible to suppress or even prevent the dart 10 that has struck the target from being knocked away by the dart 10 thrown later.
  • the present invention has been described above with reference to one embodiment, the present invention is not limited to the configuration described in the above embodiment, and includes other embodiments and modifications that are conceivable within the scope of the claims.
  • the dart of the present invention may be constructed by combining some or all of the above-mentioned examples and modifications, which are also included in the scope of the present invention.
  • the shaft is described as being detachably attached to the base end of the barrel by a threaded portion provided at the tip of the shaft, but the shaft may also be configured so as not to be detachable from the barrel.
  • the darts of the present invention can prevent or even prevent the later thrown darts from colliding with the darts already stuck in the target and being knocked away when multiple darts are thrown in succession, and can therefore achieve higher scores in competitions, and have industrial applicability, for example, in contributing to improved manufacturing and sales of darts.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Toys (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention concerne une fléchette (10), qui comprend une pointe (11), un fût (12) et une tige (13) dans cet ordre d'un côté pointe à un côté base, la tige (13) diminuant progressivement en diamètre à partir du côté pointe jusqu'au côté base ; trois ailettes (14) étant montées et fixées à des positions équiangulaires autour de l'axe de la tige (13) sur le côté base de la tige (13) ; les côtés bases des ailettes (14) faisant saillie à partir de la tige (13) et étant reliés les uns aux autres ; la tige (13) ayant une rainure (18) formée entre les ailettes (14) adjacentes les unes aux autres dans la direction circonférentielle de la tige (13) ; et la largeur interne de la rainure (18) étant progressivement élargie à partir du côté ailette (14) jusqu'au centre de la tige (13) dans la direction axiale, et progressivement rétrécie à partir du centre de la tige (13) dans la direction axiale jusqu'au côté fût (12).
PCT/JP2023/021205 2023-06-07 2023-06-07 Fléchette Ceased WO2024252573A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US18/856,148 US20250271244A1 (en) 2023-06-07 2023-06-07 Dart
EP23804884.7A EP4725566A4 (fr) 2023-06-07 2023-06-07 Fléchette
PCT/JP2023/021205 WO2024252573A1 (fr) 2023-06-07 2023-06-07 Fléchette
CA3245929A CA3245929A1 (en) 2023-06-07 2023-06-07 Dart
JP2023571226A JP7588908B1 (ja) 2023-06-07 2023-06-07 ダーツ
CN202380012013.8A CN119451731A (zh) 2023-06-07 2023-06-07 飞镖

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/021205 WO2024252573A1 (fr) 2023-06-07 2023-06-07 Fléchette

Publications (1)

Publication Number Publication Date
WO2024252573A1 true WO2024252573A1 (fr) 2024-12-12

Family

ID=93588001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/021205 Ceased WO2024252573A1 (fr) 2023-06-07 2023-06-07 Fléchette

Country Status (6)

Country Link
US (1) US20250271244A1 (fr)
EP (1) EP4725566A4 (fr)
JP (1) JP7588908B1 (fr)
CN (1) CN119451731A (fr)
CA (1) CA3245929A1 (fr)
WO (1) WO2024252573A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3160281U (ja) 2010-04-09 2010-06-17 株式会社ハマダ工商 ダーツの羽根構造
JP2011110413A (ja) 2009-11-26 2011-06-09 Chuyo Seiko Co Ltd ダーツ
JP3172260U (ja) * 2011-09-29 2011-12-08 政則 寺田 ダーツバレル
JP2012239635A (ja) * 2011-05-19 2012-12-10 Eva-Japan Co Ltd ダーツ及びダーツ用フライト
JP2013121368A (ja) * 2011-12-09 2013-06-20 Felix Corp ダーツ
JP5432785B2 (ja) 2010-03-18 2014-03-05 株式会社ハマダ工商 ダーツ

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CA3245929A1 (en) 2025-06-13
US20250271244A1 (en) 2025-08-28
EP4725566A1 (fr) 2026-04-15
CN119451731A (zh) 2025-02-14
EP4725566A4 (fr) 2026-07-15
JPWO2024252573A1 (fr) 2024-12-12

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