JPWO2020121522A1 - Shafts for darts, members for darts, and darts - Google Patents

Abstract

A cylindrical flight having a shaft threaded portion (707) having a male thread extending from one end side to the other end side of the barrel connecting portion and a flight screw accommodating portion (709) extending from the shaft threaded portion (707) to the other end side. A darts shaft (701) to be joined to a flight (703) having a cylindrical end with a female thread at the joint, and the flight (703) is fitted into the darts shaft (701) to fit the shaft threaded portion (707). ) And the female screw of the flight screw portion (711), the flight (703) and the darts shaft (701) are joined, and the axis length of the flight screw accommodating portion (709) is greater than the axis length of the female screw. For a long time, the flight (703) provides a darts shaft that is rotatably joined to the darts shaft (701).

Description

The present invention relates to a darts shaft, a darts member, and darts using them.

Today's mainstream darts consist of tips, barrels, shafts, and flights. The tip is the tip of the darts and is the part that pierces the target. The barrel is the weight that leads to the tip and is the part that you grip when setting.

The shaft is the part that connects the barrel and the flight. By changing the shape of the shaft, the trajectory of the darts can be changed when the darts are thrown. The flight is the wing portion connected to the shaft. Due to the air resistance of the blades, the darts can obtain stable flight. By assembling these parts, the darts are completed.

Here, it was important that the connection between the flight and the shaft was rotatable. This is because when the first dart is stuck, the first dart is hard to break even if the second dart to be thrown hits the flight of the first dart. Also, the second darts will not be repelled by the first darts.

In Patent Document 1, in order to rotatably connect the flight and the shaft, a concave groove and a protrusion are provided at the front end of the hollow tubular cap type flight and the rear end of the shaft to be fitted. It states that the flight and shaft are rotatably connected.

Japanese Patent No. 4350154

In order for the darts to have a stable flight, it is important that the shaft-flight junction is fixed when in flight. On the other hand, it is important that the joint between the pierced darts shaft and the flight is made appropriately rotatable.

However, in the darts described in Patent Document 1, the shaft and the flight are fixed by the cap method. Therefore, a frictional force acts between the shaft and the flight, making it difficult to rotate. In addition, the frictional force changes due to a slight manufacturing error between the shaft and the flight, and it is difficult to adjust the balance between the fixing strength and the ease of rotation.

Therefore, it is an object of the present invention to provide a new joining method in which frictional force does not easily act between a darts shaft and a flight. An object of the present invention is to rotatably join a darts shaft and a flight by adjusting the fixing strength and the ease of rotation.

The darts shaft of the present invention
A cylindrical flight joint having a shaft threaded portion having a male thread extending from one end side to the other end side of the barrel connecting portion and a flight screw accommodating portion extending from the shaft threaded portion to the other end side, and having a cylindrical end. A darts shaft that joins a flight with a female screw in the part.
The flight and the darts shaft are joined by fitting the flight into the darts shaft and turning the male screw of the shaft screw portion and the female screw of the flight screw portion.
The flight is rotatably joined to the darts shaft by having the axis length of the flight screw accommodating portion longer than the axis length of the female screw.

Since the darts using the darts shaft of the present invention do not use frictional force for joining the shaft and the flight, the ease of rotation can be improved.

Further, the present invention is characterized in that the diameter of the flight screw accommodating portion is smaller than the inner diameter of the female screw of the flight.

By doing so, the frictional force at the joint between the shaft and the flight can be reduced.

Further, the present invention is characterized in that one end side of the male screw of the darts shaft is followed by a cylindrical flight guide portion.

The flight guide section guides the flight and determines the axis on which the flight rotates. Further, by adjusting the size of the cylindrical shape of the flight guide portion, it is possible to increase the frictional force at the joint between the shaft and the flight. Therefore, the balance between the fixing strength of the shaft and the flight and the ease of rotation can be adjusted.

The darts member of the present invention
A darts shaft having a cylindrical flight joint having a shaft threaded portion having a male screw extending from one end side to the other end side of the barrel connecting portion and a flight screw accommodating portion extending from the shaft threaded portion to the other end side. ,
A flight including a cylindrical shaft joint including a flight thread portion including a female thread and a shaft screw accommodating portion extending from the flight thread portion to the back portion.
It is a member for darts equipped with
The flight is joined to the darts shaft by fitting the shaft joint into the flight joint and turning the male screw of the shaft screw portion and the female screw of the flight screw portion.
The flight is rotatably joined to the darts shaft by having the axis length of the flight screw accommodating portion longer than the axis length of the female screw.

In the darts using the darts member of the present invention, since the frictional force is not related to the joint between the shaft and the flight, the ease of rotation can be improved.

Further, the present invention is characterized in that the diameter of the flight screw accommodating portion is smaller than the inner diameter of the female screw of the flight.

By doing so, the frictional force at the joint between the shaft and the flight can be reduced.

Further, in the present invention, a cylindrical flight guide portion continues on one end side of the male screw of the darts shaft, and a cylindrical flight guide portion accommodating portion continues behind the shaft screw accommodating portion of the flight. It is characterized by being.

The flight guide unit guides the flight guide unit accommodating unit and determines the axis on which the flight rotates. Further, by increasing the diameter of the cylindrical shape of the flight guide portion, the frictional force at the joint between the shaft and the flight can be increased. Further, by reducing the diameter of the cylindrical shape of the flight guide portion accommodating portion, the frictional force at the joint between the shaft and the flight can be increased. Therefore, the balance between the fixing strength of the shaft and the flight and the ease of rotation can be adjusted.

In addition, the darts of the present invention
It is characterized by including the darts shaft or the darts member.

Since the darts shaft or the darts using the darts member of the present invention does not use frictional force to join the shaft and the flight, the ease of rotation can be improved. The darts using the darts shaft or the darts member of the present invention can adjust the balance between the fixing strength of the darts and the flight and the ease of rotation. Therefore, darts that are hard to break and easy to compete are provided.

It is the schematic of the darts shaft of one Embodiment of this invention. It is an enlarged view of the flight joint part A of FIG. It is the schematic of the flight of one Embodiment of this invention. It is the arrow view BB figure of the flight of FIG. It is CC sectional view of the flight of FIG. It is a figure which joined the darts member which consists of the shaft and the flight of one Embodiment of this invention. It is an exploded view of the flight joint part of one Embodiment of this invention. It is an exploded view of the shaft joint part of one Embodiment of this invention. It is an exploded view which joins the flight and the shaft of one Embodiment of this invention. It is sectional drawing of the joint part which joined the shaft and the flight of one Embodiment of this invention. It is the schematic of the darts of one Embodiment of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Explanation of darts)
FIG. 8 is a schematic view of darts according to one embodiment of the present invention. The darts of the present invention will be described with reference to FIG.

With reference to FIG. 8, the darts 801 according to one embodiment of the present invention is composed of a tip 803, a barrel 805, a shaft 807, and a flight 809. The tip 803 is the tip portion of the darts 801 and is a portion that pierces the target. The barrel 805 is a weight connected to the tip 803 and is a part to be gripped when set.

Further, the shaft 807 is a portion connecting the barrel 805 and the flight 809. By changing the shape of the shaft 807, the trajectory of the darts 801 can be changed when the darts 801 is thrown. Flight 809 is a vane portion connected to shaft 807. Due to the air resistance of the blades, the darts 801 can obtain a stable flight. By assembling these parts, the darts 801 is completed.

(Explanation of shaft for darts)
FIG. 1 is a schematic view of a darts shaft according to an embodiment of the present invention. FIG. 2 is an enlarged view of the flight joint A of FIG. The darts shaft of the present invention (hereinafter, simply referred to as a shaft) will be described with reference to FIGS. 1 and 2.

With reference to FIG. 1, the tip 107, which is the other end of the shaft 101, is connected to the barrel. The tip of the tip 107 is threaded (not shown) to connect to the barrel. The handle portion 105 is a portion that gives a length to the shaft 101. Since the flight trajectory of the darts changes depending on the length of the handle 105, a shaft 101 having a different length of the handle 105 is manufactured at the request of the user. The rear end 103, which is one end side of the shaft 101, is connected to the flight.

The rear end 103, which is one end side of the shaft 101, will be described with reference to FIG. FIG. 2 is an enlarged view of the flight joint A, which is the rear end 103. The flight joint 201 has a cylindrical shape.

The flight joint 201 is from a flight guide 203 that continues from one end side to the other end side of the barrel connection portion, a shaft screw portion 205 having a male thread that continues from the flight guide portion 203 to the other end side, and a shaft screw portion 205. A flight screw accommodating portion 207 that continues to the other end side is provided.

The flight guide unit 203 is inserted into a flight having a cylindrical shape, which will be described later. Therefore, the flight guide unit 203 guides the screw of the flight. The diameter of the flight guide portion 203 is smaller than the inner diameter of the female screw of the flight. Further, the flight guide unit 203 determines the axis on which the flight rotates.

When the shaft screw portion 205 and the flight screw accommodating portion 207 can guide the screw of the flight, the flight guide portion 203 may not be provided.

The shaft screw portion 205 is a male screw formed in a cylindrical shape. After fitting the flight into the flight joint of the shaft, the shaft threaded portion 205 turns around each other with the internal female thread of the cylindrical shape of the flight to join the shaft and the flight.

The flight screw accommodating portion 207 rotatably accommodates the female screw of the flight. This is because the axis length of the flight screw accommodating portion 207 is longer than the axis length of the female screw of the flight.

Further, the diameter of the flight screw accommodating portion 207 is smaller than the inner diameter of the female screw of the flight. That is, the flight screw accommodating portion 207 becomes a space in which the female screw of the flight does not contact or only the screw thread contacts. By doing so, the flight and the shaft can be joined with almost no friction.

The thread of the shaft threaded portion 205 has a dimensional difference a in consideration of contact inside the cylindrical shape of the flight. By tapering the thread on the end side, it becomes easier to enter the cylindrical shape of the flight. Also, at the time of joining, the contact between the shaft and the flight is reduced to reduce the friction generated there.

As described above, the darts using the darts shaft of the present invention do not use frictional force for joining the shaft and the flight, so that the ease of rotation can be improved. Since the diameter of the flight screw accommodating portion is smaller than the inner diameter of the female screw of the flight, the frictional force at the joint between the shaft and the flight can be reduced.

Further, one end side of the male screw of the darts shaft of the present invention is followed by a cylindrical flight guide portion. The flight guide section guides the flight and determines the axis on which the flight rotates. Further, by adjusting the size of the cylindrical shape of the flight guide portion, it is possible to increase the frictional force at the joint between the shaft and the flight. Therefore, the balance between the fixing strength of the shaft and the flight and the ease of rotation can be adjusted.

(Flight description)
FIG. 3 is a schematic view of the flight of one embodiment of the present invention. FIG. 4 is an arrow view BB of the flight of FIG. FIG. 5 is a cross-sectional view taken along the line CC of the flight of FIG. A flight according to one embodiment of the present invention will be described with reference to FIGS. 3 to 5.

As shown in FIG. 3, the flight 301 includes a shaft joint 303, and the shaft joint 303 and the blade 305 are integrally molded. With reference to FIG. 4, which is a view BB, the flight 401 has four blades 403, 405, 407, and 409 connected at right angles to each other.

The shaft joint 411 is located at the center to which the blades 403, 405, 407, and 409 are connected. With such a configuration, the flight stability of darts can be obtained.

The shaft joint 501 will be described with reference to FIG. The shaft joint 501 has a cylindrical shape. The shaft joint portion 501 includes a flight screw portion 503 having a female screw, a shaft screw accommodating portion 505 extending from the flight screw portion to the inner portion, and a flight guide accommodating portion 507 continuing from the shaft screw accommodating portion 505 to the inner portion.

When the shaft and the flight are joined, the flight screw portion 503 is guided by the flight guide portion 203 of the shaft, twisted with each other by the shaft screw portion 205 of the shaft, and accommodated in the flight screw accommodating portion 207 of the shaft.

Further, when the shaft and the flight are joined, the shaft screw accommodating portion 505 accommodates the shaft screw portion 205 of the shaft. Further, the flight guide unit accommodating unit 507 accommodates the flight guide unit 203 of the shaft. The flight guide unit accommodating unit 507 may not be provided if the flight guide unit 203 is not provided.

(Explanation of joining darts members consisting of shaft and flight)
FIG. 6 is a diagram in which a darts member made of a shaft and a flight according to one embodiment of the present invention is joined. FIG. 7A is an exploded view of the flight junction of one embodiment of the present invention. FIG. 7B is an exploded view of a shaft joint according to an embodiment of the present invention. FIG. 7C is an exploded view of joining the flight and shaft of one embodiment of the present invention. FIG. 7D is an enlarged cross-sectional view of the joint portion where the shaft and the flight of one embodiment of the present invention are joined. 6 and 7A to 7D will be used to describe the joining of the darts member made of the shaft and the flight of the present invention.

FIG. 6 shows a diagram in which a darts member composed of a shaft 601 and a flight 603 is joined. The shaft 601 and the flight 603 are rotatably joined to the right and left.

By matching the sizes of the shaft 601 and the flight 603, the shaft 601 and the flight 603 can be joined without loosening. The size will be described later in FIGS. 7A and 7B.

A state in which the shaft 701 and the flight 703 are joined will be described with reference to FIGS. 7A to 7D. As shown in FIG. 7A, the shaft 701 includes a flight guide portion 705, a shaft screw portion 707, and a flight screw accommodating portion 709 at the flight joint. As shown in FIG. 7B, the flight 703 includes a flight screw portion 711, a shaft screw accommodating portion 713, and a flight guide accommodating portion 715 at the shaft joint.

As shown in FIG. 7C, after the shaft joint of the flight 703 is fitted into the flight joint of the shaft 701, the male screw of the shaft screw portion 707 turns with the female screw of the flight screw portion 711 to rotate the shaft and the flight. The joint is made. Here, the screw tightens clockwise and disengages counterclockwise.

As shown in FIG. 7D, when the shaft and the flight are completely joined, the flight guide portion 705 is accommodated in the flight guide accommodating portion 715, and the shaft screw portion 707 is accommodated in the shaft screw accommodating portion 713. The flight screw portion 711 is accommodated in the flight screw accommodating portion 709.

With reference to FIGS. 7A and 7B, the axis length L4 of the flight screw portion 711 is slightly shorter than the axis length L1 of the flight screw accommodating portion 709. As an example, L4 is between 80% and 100%, preferably 91% and 98% of L1. For example, if L1 is 5.33 mm, L4 is 5.03 mm.

Further, the axis length L2 of the shaft screw portion 707 is slightly shorter than the axis length L5 of the shaft screw accommodating portion. As an example, L2 is between 80% and 100%, preferably 86% and 96% of L5. For example, if L5 is 3.82 mm, L2 is 3.50 mm.

When the shaft and the flight are completely joined, the shaft screw portion is accommodated in the shaft screw accommodating portion, and the flight screw portion is accommodated in the flight screw accommodating portion, so that the screws are disengaged. Therefore, even if the flight turns to the right, it will not tighten, and if the flight turns to the left, it will not come off.

The diameter d1 of the flight screw accommodating portion 709 is smaller than the inner diameter d4 of the flight screw portion 711. That is, the flight screw accommodating portion 709 is a space in which the female screw of the flight does not contact or only a part of the thread is in contact. As an example, d1 is between 80% and 100%, preferably 83% and 93% of d4. For example, if d4 is 3.31 mm, d1 is 2.90 mm.

Further, the diameter d5 of the shaft screw accommodating portion 713 is larger than the outer diameter d2 of the shaft screw portion 707. Similarly, the shaft screw accommodating portion 713 is a space in which the male screw of the shaft does not contact or only a part of the thread is in contact. As an example, d5 is a length between 100-120%, preferably 108% -118% of d2. For example, if d2 is 3.80 mm, d5 is 4.30 mm.

In order to rotatably join the shaft 701 and the flight 703, it is necessary to adjust the friction due to the contact of each part. Since the flight screw accommodating portion 709 and the flight screw accommodating portion 711 are contacted only by the thread of the flight screw portion 711, and the shaft screw portion 707 and the shaft screw accommodating portion 713 are contacted only by the thread of the shaft screw portion 707. The contribution of friction is small.

Therefore, the contact between the flight guide unit accommodating unit 715 and the flight guide unit 705 is the largest surface contact. The friction between the shaft 701 and the flight 703 can be increased by making the flight guide unit accommodating unit 715 slightly larger than the flight guide unit 705 so that the flight guide unit 705 is press-fitted.

As an example, L6 is between 100% and 150%, preferably 105% and 115% of L3. For example, if L3 is 6.17 mm, L6 is 6.75 mm. For example, the sum of the axis length L1 of the flight screw accommodating portion and the axis length L2 of the shaft screw accommodating portion is 0.02 mm shorter than the sum of the axis length L4 of the flight screw portion and the axis length L5 of the shaft screw accommodating portion. Therefore, L3 and L6 may have the same length.

As an example, d6 is a length between 100% and 120%, preferably 102% and 112% of d3. For example, if d3 is 2.90 mm, d6 is 3.10 mm.

In the darts using the darts member of the present invention, since the frictional force is not related to the joint between the shaft and the flight, the ease of rotation can be improved. Since the diameter of the flight screw accommodating portion is smaller than the inner diameter of the female screw of the flight, the frictional force at the joint between the shaft and the flight can be reduced.

The flight guide unit guides the flight guide unit accommodating unit and determines the axis on which the flight rotates. Further, by increasing the diameter of the cylindrical shape of the flight guide portion, the frictional force at the joint between the shaft and the flight can be increased. Further, by reducing the diameter of the cylindrical shape of the flight guide portion accommodating portion, the frictional force at the joint between the shaft and the flight can be increased. Therefore, the balance between the fixing strength of the shaft and the flight and the ease of rotation can be adjusted.

Since no frictional force is used to join the shaft and flight, the ease of rotation can be improved. The darts using the darts shaft or the darts member of the present invention can adjust the balance between the fixing strength of the darts and the flight and the ease of rotation. Therefore, darts that are hard to break and easy to compete are provided.

The present invention is applicable to darts.

101 Shaft 103 Rear end 105 Handle 107 Tip 201 Flight joint 203 Flight guide 205 Shaft thread 207 Flight screw housing 301 Flight 303 Shaft joint 305 Blade 401 Flight 403, 405, 407, 409 Blade 411 Shaft joint 501 Shaft joint 503 Flight screw housing 505 Shaft screw housing 507 Flight guide housing 601 Shaft 603 Flight 701 Shaft 703 Flight 705 Flight guide 707 Shaft screw housing 709 Flight screw housing 711 Flight screw housing 713 715 Flight Guide Storage 801 Dart 803 Tip 805 Barrel 807 Shaft 809 Flight

Claims (7)

A cylindrical flight joint having a shaft threaded portion having a male thread extending from one end side to the other end side of the barrel connecting portion and a flight screw accommodating portion extending from the shaft threaded portion to the other end side, and having a cylindrical end. A darts shaft that joins a flight with a female screw in the part.
The flight and the darts shaft are joined by fitting the flight into the darts shaft and turning the male screw of the shaft screw portion and the female screw of the flight screw portion.
A darts shaft in which the flight is rotatably joined to the darts shaft when the axis length of the flight screw accommodating portion is longer than the axis length of the female screw. The darts shaft according to claim 1, wherein the diameter of the flight screw accommodating portion is smaller than the inner diameter of the female screw of the flight. The darts shaft according to claim 1 or 2, wherein one end side of the male screw of the darts shaft is followed by a cylindrical flight guide portion. A darts shaft having a cylindrical flight joint having a shaft threaded portion having a male screw extending from one end side to the other end side of the barrel connecting portion and a flight screw accommodating portion extending from the shaft threaded portion to the other end side. ,
A flight including a cylindrical shaft joint including a flight thread portion including a female thread and a shaft screw accommodating portion extending from the flight thread portion to the back portion.
It is a member for darts equipped with
The flight is joined to the darts shaft by fitting the shaft joint into the flight joint and turning the male screw of the shaft screw portion and the female screw of the flight screw portion.
A darts member in which the flight is rotatably joined to the darts shaft when the axis length of the flight screw accommodating portion is longer than the axis length of the female screw. The darts member according to claim 4, wherein the diameter of the flight screw accommodating portion is smaller than the inner diameter of the female screw of the flight. 4. A cylindrical flight guide portion continues to one end side of the male screw of the darts shaft, and a cylindrical flight guide portion accommodating portion continues to the inner part of the shaft screw accommodating portion of the flight. Or the darts member according to 5. A darts having the darts shaft according to any one of claims 1 to 3 or the darts member according to any one of claims 4 to 6.

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