JPS6036306B2 - dart - Google Patents

Description

[Detailed description of the invention] The present invention relates to darts.

The dart game is usually played with one set of three darts. In other words, a dart is thrown at a target and a specified score is added up.
The target usually has the shape of a circular dart board and is divided into 20 sections numbered 1-20 in a fixed order.
Two wires arranged relatively close to each other extend around the periphery of the dart board and these two wires intersect the wires delimiting the 20 sections described above. Since a part of the target separated by a wire and two adjacent intersecting wires shows twice the number distributed to the individual parts, if the part in question has a value of 20, then the part divided by The number of darts that hit the part was 40.
You can also obtain. Similarly, two more wires are placed inside the surrounding wires in the same circle with a radius of some distance and closely adjacent. These wires, with intersecting wires, are distributed in individual sections with a number of 3
Divide into areas that will double. The area surrounding the center of the disk is given a value of 50, and the area further surrounding this area is given a value of 25. Although relatively thin and pliable, the wires separating the various target areas of the dart board also present an obstacle to darts aimed at one of the target areas.

For example, it sometimes happens that the needle of a dart hits the separator wire, causing the dart to bounce back. This means that sometimes not all darts thrown will necessarily score,
It puts the thrower at a disadvantage against his competitors. The maximum score that can be obtained on the dartboard described using clearly 3 arrows is 180, which is achieved by hitting 3 arrows in an area 3 times the value 20 part.

However, such an area is relatively small and the dart wings located in this area easily block it from view.
Furthermore, the wings of a dart located in said area will act as an obstacle to the next dart that passes through this area, and will repel the very next dart and the darts that follow. The object of the invention is to provide a dart in which the disadvantages mentioned above are at least substantially overcome.

an elongated main body portion having a hole extending from one longitudinal end to the other end in a longitudinal direction; a wing portion having a wing shaft coupled to the other end of the main body portion; and the main body portion. a pointed member inserted into the hole of the main body and movable relative to the main body between a first predetermined position and a second predetermined position spaced apart in the longitudinal direction of the main body; a compression coil spring that is also provided around at least a portion of the inner portion and biases the tip member against the main body portion in a direction in which a portion of the tip member protrudes from the one end side of the main body portion; It's in the dart. The spring is effective to provide a repulsive force on the tip when the tip hits an obstacle, such as a wire separating two adjacent target areas.

The elongate body preferably consists of two halves that can be screwed together or connected by some other suitable means.

The hole in one half is enlarged to form a chamber for accommodating a spring, the part of the tip village located in the chamber being at least in the -direction of the relative movement of the body part. and a raised portion capable of restricting the same movement of the tip member relative to the tip member.

The chamber includes a first wall defining the first predetermined position and a second wall defining the first predetermined position.
and a second wall defining a predetermined position.

The second predetermined location may be bounded by an end of the wing shaft proximate the end of the tip. In this latter case, the end of the wing shaft may also be provided with a reinforcing member to prevent damage when the tip rebounds and collides with the tip. The diameter of the hole is sized to allow the tip to move radially within the hole. The ejection means may be located between the end of the tip proximate the wing and the wing so as to be pushed out by axially moving the tip toward the wing.

Alternatively, the tip may be disposed at the very end such that it displaces the wing when it is moved axially toward the wing. Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that the features of the present invention can be more clearly and easily understood.

The illustrated dart consists of an elongated body part 1 having two halves 2,3.

The main body part 1 is provided with a hole 4 extending from one end in the longitudinal direction to the pond end, and the hole 4 in the half body 2 is enlarged to form a chamber 5. There is. hole 4
An elongated pointed member 7 is movably arranged through the chamber 5 . A shoulder 8 is provided on the part of the point 7 located within the chamber 5, which shoulder 8 supports one end of the spring 10 in the assembled dart state. This spring has the effect of absorbing the repulsive force acting on the tip village 7 in the direction of the wing of the dart, as will be described in detail below.
The wing (not shown) has a wing axis 11;
This wing shaft 11 is tightly fitted into one end of the hole 4 in the half body 2. The tip member 7 is a continuous body, the end of which is connected to the wing shaft 11.
A push-out pin 12 is formed having an end at a distance a distance from the end 13 of.

The distance a between the wing shaft 11 and the mutually opposite ends of the expulsion pin 12 is such that the tip member 7 can be sufficiently penetrated into the target by the tip member 7 in the body part 1.
It is arranged in such a way that the wing can be expelled from the hole 4 when it moves in the axial direction. When the tip member 7 hits the target, the body 1 is decelerated slightly, but this deceleration is not appreciable and the body 1 continues to move towards the target. When the main body 1 moves a distance equal to the distance a with respect to the tip member 7, the ejecting pin 12 of the tip member 7 contacts the wing shaft 11, and the main body 1 further moves relative to the tip member 7. to create the wings. Evidently, the length of the tip protruding from the distal surface of the half 3 allows the tip 7 to be inserted into the target and the relative movement between the body 1 and the tip 7 to create wings. must be sufficient.

Although the hole 4 is shown extending completely through the main body 1, the hole may extend from one end of the main body 1 toward the other end. 1, the hole extends from one end side to the other end side, the part between the deep part of the hole and the end of the pond is closed, and a hole for receiving the wing shaft 11 is provided at the other end. .

In this case there is no element for expelling the wing, and the tip 7 partially extends into the chamber 5, the part of the wing shaft located in the chamber 5 being surrounded by the spring 101. There is. Alternatively, the body need not be provided with a chamber 5 for the spring 10, which can be housed in the bore 4 and to limit the axial movement of the tip 7 between the previously mentioned predetermined positions. means are provided. Typically, the wings of the dart are made of plastic material, and in the case of darts where the second predetermined position is bounded by the end of the wing shaft inserting into the body, the wing shaft is It is prone to damage as a result of collisions between it and flying greenery. To prevent this, a hard material can be inserted at the end of the wing shaft that can withstand repeated impacts by the dart shaft bouncing through the body. This insertion is indicated at 13a.

Regarding the bounce frequency of darts made according to the invention in which the point member is movable transversely relative to the body against the force of the spring, darts with a fixed point member, i.e. It has been found that the dart according to the invention bounces much less than a dart in which the arrow does not move freely in the axial direction.

The reasons why this is the case are not fully understood, but one reason can be said to be as follows.

The velocity of a thrown dart can be broken down into three components: a Z-direction component, an X-direction component acting perpendicularly between 20 and 3 on the standard slope, and a Y-component acting at right angles to the x-component. . The wire of the dart board is relatively thin and somewhat ballistic, and the board on which the wire is disposed is of a flexible material compared to the dart and point members of the dart.

Therefore, when struck by a dart, the wire does not remain stationary, but moves slightly in one of at least three velocity components. The energy required for this movement is obtained from the kinetic energy of the dart, thereby reducing its kinetic energy. Whether the dart changes direction and the extent of this change depends on the angle at which the dart hits the wire. If a dart with a rigidly attached point member hits the central band of the wire, as seen with respect to the longitudinal axis of the wire, then the dart releases most of its kinetic energy and its direction of motion is reversed. The dart then falls to the ground without scoring any distance from the dart board. If the dart hits an area of wire adjacent to this midband castle, the dart loses less kinetic energy than when it hits the midband castle. In addition, “3
There are many changes in the velocity of the components. The speed of the dart after the counterattack is not strong enough or in the direction to drive the dart into the board. When a dart with a rigidly attached needle strikes the area around the wire, the dart loses little energy as a result of striking the wire, however, and the principal component velocity is either the x or the Y component. This is done by sliding the tip of the dart around the wire into the dart board. Generally, when a moving object hits a stationary object, the transfer of kinetic energy from the moving object to the stationary object depends on the speed of the moving object and the weight of the two objects. When the dart tip village is rigidly attached, the energy transfer depends on the weight of the dart and the elasticity of the wire. On the other hand, if the dart tip is movably mounted as in the present invention, and the spring is not fully compressed when the dart hits the wire, this energy transfer will be due to the weight of the dart tip. It depends on the elasticity of the wire. Therefore, when the movable tip hits the wire, the amount of energy lost by the dart as a whole is 4.5 mm compared to the amount of energy lost when the tip is rigidly attached. Sufficient kinetic energy remains to insert the dart into the board to score.When a dart made according to the invention hits the central band of wire, the rebound of the point member increases the velocity of the dart body. Almost no change.

However, the direction of movement of the tip member is reversed. During the first bounce, the speed of the spring body is slightly reduced and the speed of the tip member is significantly reduced. The spring then reverses the direction of movement of the tip with internal rebound of the tip against itself or the body. Whether there is internal bounce between the body and the tip depends on the spring force and the weight of the body and tip. The tip village then hits the wire surface again at the same location or immediately adjacent to its initial location. After two or more bounces, probably due to internal bounce of the point, the body loses velocity and the dart is not inserted into the plate.

When a dart made according to the invention hits a wire in an area adjacent to said central band, the course of events is similar to that when it hits said central band castle. However, depending on the angle between the Z-direction velocity component and the wire surface, energy transfer, tip rebound, etc., change the main velocity of the dart into the X or Y component. The point where the tip meets the wire is further from the center band than the point where the tip first hits the wire. The angle between the Z component and the wire surface will be larger than when the tip first hits the wire, and the angle between the X or Y
The velocity component in the direction is larger than the component in the Z direction. Because of the low loss of kinetic energy after each bounce, if the tip passes through the wire, there is enough energy remaining to insert the tip into the plate. There is a tendency for the point member to slip off or go around the wire due to the change in the point. This tendency increases when the point can move radially. The bounce frequency of darts made according to the present invention is Experiments have shown that the vehicle weight is influenced by the weight of the tip, the maximum relative axial movement of the tip with respect to the body, the speed at which the dart is thrown, and the spring rating.

Although no general limits can be given regarding spring ratings, springs that can store the rebound energy of the tip at the point where the tip contacts its rear limit of travel surface are preferred. The spring should not be decelerated to such an extent that the residual speed of the dart is insufficient for the purpose of It is appropriate that it is between 1000N'm, more preferably 200N'm.
'm and 600 N/m. Experiments have shown that the axial movement of the tip in the body is between 4.5 and 20 degrees, more preferably between 1 and 15 degrees. Many tests were conducted with darts of different weights.

The results of these tests are shown in Table 1. Each dart is thrown 500 times with an arithmetic mean speed of 5 m/s. The test plate consists of a base material of fibrous material and a plurality of wires arranged in a grid on the base material. Vertical wire grids are spaced 4 distances apart and have a length of 1
It was 6c in diameter and 1.65 willow in diameter. The transverse wire grids were 5 wires apart and 1.5 inches in diameter. The wire covered approximately 55% of the area of the test plate. The dart was dropped or thrown onto the test board from a distance of 1.5 tables at the aforementioned arithmetic mean speed of 5 m/s. Test A, was carried out using darts (weight 24) which were not spring-loaded but whose tip member could move radially a distance of 0.7 skin.The bounce frequency of these darts was were 9.8% and 8.6%, respectively. Tests A3 to A3 were conducted using a dart in which each point member was able to move axially against the force of a spring. The spring was rated at 600 N'm. A significant improvement in bounce frequency was recorded, and the best results were obtained for the darts used in the test with the point member moved 14.5 axially. A7 was performed without using a spring, using a dart whose tip member can move six degrees in the axial direction.The bounce frequency was 9.9 mm, despite the ability of the tip member to move in the axial direction. Tests revealed that the bounce frequency of the dart was significantly reduced when the point member was allowed to move axially against the force of the spring. Low bounce frequencies are also obtained when radial displacement is possible. Preferably, this radial displacement is between 0.2 and 0.8 ribs. Although the present invention has been described with respect to a particular embodiment, only this The invention is not limited to, and many modifications are possible within the scope of the invention.

Table 1 The weight of the tip member was approximately 1.59.

*=No

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a dart according to the present invention, and FIG. 2 is a cross-sectional view taken along line A-B in FIG. 1 is a main body, 2 and 3 are halves, 4 is a six, 5 is a chamber, 7 is a tip member, 10 is a spring, and 11 is a wing shaft. Nada〆mono 2

Claims (1)

[Scope of Claims] 1. An elongated main body portion having a hole extending from one longitudinal end side to the other end side in the internal center thereof, and a wing shaft connected to the other end side of the main body portion. a wing portion; a first blade inserted into the hole of the main body portion and spaced apart in the longitudinal direction of the main body portion;
a pointed member movable relative to the main body between a predetermined position and a second predetermined position; and a compression coil spring that urges the pointed member against the main body in a direction in which the tip protrudes from the one end of the main body. 2. The dart according to claim 1, characterized in that the rating of the spring is between 100 N/m and 1000 N/m. 3. The dart according to claim 2, characterized in that the rating of the spring is between 200 N/m and 600 N/m. 4. The dart according to any one of claims 1 to 3, wherein a movable distance of the tip member with respect to the main body is between 4.5 mm and 20 mm. 6. The dart according to claim 4, wherein the movable distance is between 10 mm and 15 mm. 6. The dart according to any one of claims 1 to 5, wherein the pointed member is disposed within the hole so as to be movable also in the radial direction of the hole. 7
7. A dart according to claim 6, characterized in that the movable distance in the radial direction is between 0.1 mm and 1 mm with respect to the central axis of the hole. 8. The movable distance in the radial direction is 0.2 mm to 0.8 mm.
Claim 7 characterized in that the diameter is between 7 mm.
The dart mentioned in the section. 9. A throw according to any one of claims 1 to 8, characterized in that the main body consists of two halves, each of which is provided with means for interconnecting. arrow. 10. A dart according to claim 9, characterized in that one hole in said half is enlarged to create a chamber for accommodating said spring. 11. A patent claim characterized in that the portion of the tip member installed in the chamber includes a large diameter portion for restricting relative movement of the tip member in the axial direction in at least one direction with respect to the main body portion. A dart as described in item 10 of the scope of . 12. The dart according to claim 11, wherein the chamber has a first wall defining the first predetermined position and a second wall defining the second predetermined position. . 13. A wing expelling means is installed between an end of the tip member adjacent to the wing and the wing, and drives out the wing by moving the tip member axially toward the wing. A dart according to any one of claims 1 to 12, characterized in that: 14. The dart according to claim 13, wherein the expelling means is a part of the pointed member. 15. The dart according to any one of claims 1 to 14, characterized in that a reinforcing member is attached to the end of the wing shaft inserted into the main body.