Dart
By designing the groove structure between the dart rod gradually shrinks and the dart wing, the problem of dart being bounced off or off-target due to collision during the throwing process is solved, and the throwing accuracy and score are improved.
Patent Information
- Application Number
- CN202380012013.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-07
- Publication Date
- 2025-02-14
AI Technical Summary
Existing darts are easily bounced off or off-target due to collisions during throwing, which affects the throwing accuracy and score.
A dart is designed, and its dart rod gradually shrinks from the top side, and three dart wings are installed on the base side, forming a groove between the dart wings, and the inner width of the groove tends toward the center of the axial center of the dart rod as it moves from the dart wing side toward the center of the axial center of the dart rod. It gradually widens and gradually narrows as it tends toward the side of the dart.
Effectively suppress the collision between the darts thrown afterwards and the darts that have pierced into the target, preventing them from being bounced or off-target, and improving throwing accuracy and scoring.
Smart Images
Figure CN119451731A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a dart used in a sports game apparatus for throwing darts at a target (dart board) installed on a wall or the like to score points in a game or the like. Background Art
[0002] As a sports competition for scoring, dart competitions have also been widely developed as professional competitions. Specifically, it is a competition in which darts (arrows, darts) are thrown at a target to compete for the highest score in the center, and the competition is how to throw more darts into the center of the target. Therefore, it is a competition that requires the darts to be thrown into the center of the target as much as possible.
[0003] In the past, for example, darts disclosed in Patent Documents 1 to 3 are known, but when such darts are thrown, since the next dart is thrown while the first thrown dart has already pierced the target, the later thrown dart may collide with the dart that has already pierced the target and be deflected, and the darts may not pierce the same position. In addition, the dart that has already pierced the target may be deflected and miss the target.
[0004] Therefore, the inventors of the present application proposed the dart disclosed in Patent Document 4.
[0005] Prior art literature
[0006] Patent Literature
[0007] Patent Document 1: Japanese Patent Application Publication No. 2011-110413
[0008] Patent Document 2: Japanese Patent No. 5432785
[0009] Patent Document 3: Japanese Utility Model Registration No. 3160281
[0010] Patent Document 4: Japanese Patent No. 5748345 Summary of the invention
[0011] Problems to be solved by the invention
[0012] The above-mentioned darts can also suppress the dart thrown later from colliding with the dart that has already penetrated the target and being deflected, or the dart that has penetrated the target from being deflected by the dart thrown later, as compared with the related art. However, further improvement is desired.
[0013] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dart which can suppress and prevent a dart thrown later from colliding with a dart that has already penetrated a target and being deflected, or a dart that has penetrated a target from being deflected by a dart thrown later than in the past.
[0014] Means for solving problems
[0015] The dart of the present invention based on the above-mentioned object comprises a dart tip, a dart barrel and a dart shaft in order from the tip end side to the base end side.
[0016] The dart shaft gradually decreases in diameter from the top end side to the base end side. On the base end side of the dart shaft, three dart wings are fixedly mounted at equal angles with the axis of the dart shaft as the center, and the base ends of the dart wings protrude from the dart shaft and are connected to each other.
[0017] A groove is formed on the dart shaft between the dart wings adjacent to each other in the circumferential direction of the dart shaft, and the inner width of the groove gradually widens from the dart wing side toward the axial center of the dart shaft, and gradually narrows from the axial center of the dart shaft toward the dart barrel side.
[0018] As described above, the number of dart wings is three, and since they are fixed on the dart shaft at equal angles (120-degree intervals) with the axis of the dart shaft as the center, the intervals between adjacent dart wings in the circumferential direction of the dart shaft can be made wider than the case where the number of dart wings is four (90-degree intervals). Therefore, when throwing darts continuously, the dart thrown later is less likely to collide with the dart wings of the dart that have already penetrated the target.
[0019] In addition, the dart shaft is shaped so that its diameter gradually decreases from the top end to the base end. Since the base ends of the dart wings protrude from the dart shaft and are connected to each other, the dart thrown later is less likely to collide with the dart shaft of the dart that has already pierced the target, and can penetrate smoothly even in the event of a collision.
[0020] In addition, grooves are formed between the dart wings adjacent to each other in the circumferential direction of the dart shaft, and by setting the number of dart wings to three, the cross-sectional area of each groove (the area of the surface orthogonal to the axial direction of the dart shaft) can be increased compared to the case where the number of dart wings is four, so that the above-mentioned effect is further improved. It should be noted that the inner width of the groove gradually widens and then gradually narrows as it moves from the dart wing side to the dart barrel side in the axial direction of the dart shaft, so that the strength of the dart shaft is not lost, and even if the tip of the dart tip of the dart thrown later collides with the dart that has already penetrated the target, it can still penetrate smoothly.
[0021] Here, it is preferable that the depth of the groove gradually increases from the dart blade side toward the center of the axial direction of the dart shaft, and gradually decreases from the center of the axial direction of the dart shaft toward the dart barrel side.
[0022] In addition, it is preferred that the three grooves have the same shape and are formed at equal angular positions with the axis of the dart shaft as the center.
[0023] Furthermore, the dart shaft can be attached to and detached from the dart barrel.
[0024] Effects of the Invention
[0025] With regard to the dart of the present invention, for example, when a plurality of darts are thrown continuously, the dart thrown later is unlikely to collide with the dart wings of the dart that has already pierced the target. In addition, even if the dart tip of the dart thrown later collides with the dart that has already pierced the target, it can smoothly penetrate.
[0026] Therefore, compared with the existing darts, the dart thrown later will not be greatly bounced away by the dart that has penetrated the target, but can penetrate the target at a position close to the dart, or compared with the past, it is possible to suppress and prevent the dart that has penetrated the target from being bounced away by the dart thrown later and thus get a high score in a competition. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 FIG. 1 is a top view of a dart according to an embodiment of the present invention.
[0028] Figure 2 It is a front view of the dart shaft and dart wings of the dart.
[0029] Figure 3 It is a bottom view of the dart shaft and dart wings.
[0030] Figure 4 This is a right side view of the dart shaft and dart wings.
[0031] Figure 5 yes Figure 2 AA section view. DETAILED DESCRIPTION
[0032] Next, embodiments embodying the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention.
[0033] like Figures 1 to 4 As shown, a dart 10 according to an embodiment of the present invention comprises a dart tip (also called a needle tip) 11, a dart barrel 12 and a dart shaft 13 in sequence from the top end side (front side) to the base end side (back side), and a dart wing 14 is fixedly mounted on the base end side of the dart shaft 13. When a plurality of darts 10 are thrown continuously, compared with the past, it is possible to suppress and prevent a dart 10 thrown later from colliding with a dart 10 thrown earlier and piercing a target (dart target: not shown) and being bounced away, or a dart 10 piercing the target from being bounced away by a dart 10 thrown later.
[0034] The following details are given.
[0035] like Figure 1 As shown, the dart tip 11 is provided at the front end portion in the axial direction of the dart 10 and is inserted into the target.
[0036] The dart tip 11 is made of, for example, metal or plastic, and is attachable to and detachable from the dart barrel 12 (can be replaced) by a screw portion or the like (not shown).
[0037] like Figure 1As shown, the dart barrel 12 is provided at the central portion of the dart 10 in the axial direction, and the dart barrel 12 is usually held when the dart 10 is thrown.
[0038] The dart barrel 12 is mainly made of metal and has weight to throw the dart 10 far away. The dart barrel 12 may be made of various materials such as brass, nickel alloy, and tungsten alloy. Among them, tungsten alloy and nickel alloy with high specific gravity make the dart barrel thinner and less likely to interfere when hitting the target.
[0039] It should be noted that the dart barrel 12 has various shapes, anti-slip grooves, weights, etc.
[0040] like Figures 1 to 5 As shown, the dart shaft 13 is provided at the base of the axial direction of the dart 10, and the dart flight 14 is fixedly mounted on the base end side of the dart shaft 13, and is a part that exerts an effect of making the dart 10 fly straight. That is, the dart flight 14 is a blade part.
[0041] The cross section of the dart shaft 13 is circular, and the diameter gradually decreases (becomes a tapered shape) as it moves from the tip side to the base side in the axial direction, and can be screwed into the base end of the dart barrel 12 by means of a threaded portion (male thread) 15 provided at the tip end thereof to be fixed (replaceable). It should be noted that the maximum diameter (the diameter of the tip excluding the threaded portion 15) D of the dart shaft 13 is, for example, about 4.5 mm to 6.5 mm, and the length (the length excluding the threaded portion 15) L1 of the dart shaft 13 in the axial direction is, for example, about 45 mm to 60 mm, and is not particularly limited.
[0042] The material of the dart shaft 13 can be metal, resin (plastic), polycarbonate, carbon composite material, etc., as long as the above-mentioned effect can be exerted, there is no particular limitation, and polyamide resin is preferably used. The polyamide resin refers to a substance having an amide bond, such as amino acid, lactam or diamine, dicarboxylic acid as the main component.
[0043] Here, it is preferred that the dart shaft 13 and the dart wing 14 are integrally formed (integrated structure) by injection molding using the same resin material, but the dart shaft and the dart wing may be formed separately and then combined. In this case, a groove may be formed on the base end side of the dart shaft and the dart wing may be inserted into the groove to be installed and fixed. It should be noted that the materials of the dart shaft and the dart wing may be the same or different.
[0044] On the base end side of the dart shaft 13, three dart wings 14 are fixed (formed) at equal angular positions with the axis of the dart shaft 13 as the center. Here, the equal angular positions refer to positions with an interval of 120 degrees with the axis of the dart shaft 13 as the center, but due to manufacturing errors, for example, the case where the positions are offset within a range of about ±1 degree (a range of 119 degrees to 121 degrees) also belongs to the equal angular positions.
[0045] The top end of the dart wing 14 is fixed to the outer periphery of the dart shaft 13 from the center in the axial direction to the base end side, and the base end side of the dart wing 14 protrudes outward (rearward) from the dart shaft 13 to the base end side in the axial direction and is connected to each other. Figure 4 As shown, when the dart 10 is viewed from the rear, the three dart flights 14 are arranged radially around the axis of the dart 10 .
[0046] It should be noted that the installation length of the dart wing 14 relative to the dart shaft 13 is, for example, about 50% to 80% (preferably more than 60%) of the length L2 of the dart wing 14 along the axial direction of the dart shaft 13, and the height H of the dart wing 14 relative to the axis of the dart shaft 13 is about 15mm to 25mm. In addition, the length L3 of the dart shaft 13 in the axial direction without the dart wing 14 is about 20mm to 30mm, but there is no special limitation.
[0047] The three dart wings 14 have the same shape, for example, a standard shape (hollow shape), a kite shape, a teardrop shape, a narrow shape, etc. Figure 2 As shown, the outer peripheral contour of each dart flight 14 is composed of a curved surface formed by connecting a top side slope 16 and a base side slope 17, the top side slope 16 has a gentle inclination angle from the top side to the base side along the axis direction of the dart shaft 13, and the inclination angle of the base side slope 17 is steeper than that of the top side slope 16. Specifically, the curvature radius R1 of the rising portion constituting the top side slope 16 is about 8mm to 13mm, the base side slope 17 is raised at about 58 degrees to 65 degrees relative to the axis, and the curvature radii R2, R3, and R4 from the top side slope 16 to the base side slope 17 are, R2 is about 17mm to 21mm, R3 is larger than R2, about 27mm to 33mm, and R4 is smaller than R2, about 4mm to 7mm, but it is not particularly limited.
[0048] The thickness of the dart flight 14 is generally about 0.3 mm to 0.5 mm, and the length L4 including the length L1 of the dart shaft 13 to the base end of the dart flight 14 is, for example, about 65 mm to 75 mm, but is not particularly limited.
[0049] The dart shaft 13 has grooves 18 (three in total) formed between the dart wings 14 adjacent to each other in the circumferential direction. The grooves 18 are formed at equal angular positions with the axis of the dart shaft 13 as the center. Here, the equal angular positions are positions spaced 120 degrees apart with the axis of the dart shaft 13 as the center, but due to manufacturing errors, for example, positions that are offset within a range of about ±1 degree (a range of 119 degrees to 121 degrees) also belong to the equal angular positions.
[0050] The shape, inner width and depth of the groove 18 are set so that the strength of the dart shaft 13 is not impaired and the dart 10 thrown later can smoothly penetrate the target even if it collides with the dart 10 that has already penetrated the target.
[0051] The three grooves 18 have the same shape, and their inner width gradually widens (inverted tapered shape) as they approach the center of the axial direction of the shaft 13 from the dart wing 14 side (the position where the three dart wings 14 are connected to each other), and gradually narrows (tapered shape) as they approach the barrel 12 side (the region where no dart wing 14 exists in the axial direction of the shaft 13) from the center of the axial direction of the shaft 13. In addition, the depth of each groove 18 gradually increases as it approaches the center of the axial direction of the shaft 13 from the dart wing 14 side, and gradually decreases as it approaches the barrel 12 side (the region where no dart wing 14 exists in the axial direction of the shaft 13) from the center of the axial direction of the shaft 13.
[0052] The ends of the groove 18 on the dart barrel 12 side and the ends on the dart wings 14 side are acute angled (V-shaped). The position where the inner width of the groove 18 is the largest is located on the dart barrel 12 side at the center of the axial direction of the dart shaft 13 (the region where the dart wings 14 do not exist in the axial direction of the dart shaft 13), so the ends of the groove 18 on the dart wings 14 side are sharper (more acute angled) than the ends on the dart barrel 12 side. It should be noted that the maximum inner width of the groove 18 is, for example, about 3 mm to 5 mm, but is not particularly limited.
[0053] In addition, if Figure 4 , 5 As shown, the bottom surface of the groove 18 is an arc-shaped cross section (curve: for example, the radius of curvature is about 0.4mm to 0.6mm). The position where the groove 18 has the greatest depth is the dart barrel 12 side of the axial center of the dart shaft 13 (the area where the dart wings 14 do not exist in the axial direction of the dart shaft 13).
[0054] It should be noted that the position where the inner width of the groove 18 is the largest is the same as the position where the depth is the largest, but they may be different.
[0055] As described above, the number of the dart wings 14 of the dart 10 is three, the dart shaft 13 is in a shape that gradually decreases in diameter from the tip side to the base side, and the groove 18 of the above-mentioned structure is formed between the dart wings 14 and the dart wings 14 adjacent to each other in the circumferential direction of the dart shaft 13. Therefore, when a plurality of darts 10 are thrown continuously, the tip of the dart tip 11 of the dart 10 thrown later does not collide with the base end of the dart shaft 13 of the dart 10 that has already pierced the target, causing the dart 10 thrown later to be bounced away, but pierces the vicinity of the dart 10 that has already pierced the target. In addition, compared with the past, it is possible to suppress and prevent the dart 10 that has already pierced the target from being bounced away by the dart 10 thrown later.
[0056] The present invention has been described above with reference to one embodiment, but the present invention is not limited to the configuration described in the above embodiment, and also includes other embodiments and modifications considered within the scope of the matters described in the claims. For example, the case where a part or all of the above-mentioned embodiments and modifications are combined to form the dart of the present invention is also included in the scope of the present invention.
[0057] In the above-mentioned embodiment, the case where the dart shaft is detachable from the base end of the dart barrel by the threaded portion provided at the tip end thereof is described, but the dart shaft may be configured to be non-detachable from the dart barrel.
[0058] Industrial Applicability
[0059] According to the dart of the present invention, when a plurality of darts are thrown continuously, it is possible to suppress and prevent a dart thrown later from colliding with a dart that has already penetrated a target and being deflected, or a dart that has penetrated a target from being deflected by a dart thrown later, compared to the past, and high scores can be obtained in competitions, etc. Therefore, it has industrial applicability such as contributing to the improvement of the manufacture and sale of darts.
[0060] Description of Reference Numerals
[0061] 10: Dart, 11: Dart tip, 12: Dart barrel, 13: Dart shaft, 14: Dart wings, 15: Threaded portion, 16: Top end side slope, 17: Base end side slope, 18: Groove
Claims
1. A dart comprising a dart tip, a dart barrel and a dart shaft in order from the top end side to the base end side, wherein the dart is characterized in that: The dart shaft gradually decreases in diameter from the top end side to the base end side. On the base end side of the dart shaft, three dart wings are fixedly mounted at equal angles with the axis of the dart shaft as the center, and the base ends of the dart wings protrude from the dart shaft and are connected to each other. A groove is formed on the dart shaft between the dart wings adjacent to each other in the circumferential direction of the dart shaft, and the inner width of the groove gradually widens from the dart wing side toward the axial center of the dart shaft, and gradually narrows from the axial center of the dart shaft toward the dart barrel side.
2. The dart according to claim 1, characterized in that The depth of the groove gradually increases from the dart blade side toward the center of the axial direction of the dart shaft, and gradually decreases from the center of the axial direction of the dart shaft toward the dart barrel side.
3. The dart according to claim 1 or 2, characterized in that: The three grooves have the same shape and are formed at equal angular positions with the axis of the dart shaft as the center.
4. The dart according to claim 3, characterized in that The dart shaft is detachable relative to the dart barrel.
Citation Information
Patent Citations
Tape electric wire and its manufacturing method
JP1979032785A
Catalyst which can form stable dispersoid in aqueous medium
JP1982048345A
Dart
JP2011110413A
Dartlike weapon with three leaf fins
CN204709742U
Dart rod inserted on side edge and dart
CN212187707U