JPH0546826B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an adjustment method for making the blade shape of a shuttlecock used in badminton matches uniform. [Prior technology] Shuttlecocks are made by planting waterfowl and land bird feathers in a skirt shape on a base made of cork, PVC, polyurethane, polyolefin, or other foam wrapped in synthetic leather, and then braiding the feathers together. It is formed by molding a synthetic resin such as nylon into a skirt shape that resembles the aerodynamic characteristics of natural feathers and planting it on a stand. The performances required of a shuttlecock include repulsion, flight stability, and feel at impact. The best products that meet these requirements are those made from waterfowl feathers and natural cork.
This combination is still widely used, including in official matches. [Problem to be solved by the invention] The shape of the shuttlecock, especially the shape of the shuttlecock (usually
The shape of the skirt, which is made up of 14 to 16 blades, greatly influences flight characteristics.
Products are classified into classes based on flight distance, so it is desirable to make many shuttlecocks with skirts shaped to fly well. However, shuttlecocks whose skirts are made from waterfowl feathers and bases from natural cork have natural feathers, so it is impossible to keep the shape of the skirt constant, and only shuttlecocks that fly well are made. I can't say I'll make one. Furthermore, in already manufactured shuttlecocks, the shape of the skirt portion often becomes distorted during storage (in stock) after manufacture, resulting in a reduction in flight distance. This invention was made in view of these circumstances, and by making the shape of the skirt of a shuttlecock made of natural feathers and natural cork uniform, it eliminates variations in flight characteristics and makes a shuttlecock that flies well. Our goal is to provide ways for you to get more. [Means for solving the problem] In order to achieve the above object, the present invention provides a shuttlecock in which a plurality of blades are planted in a circular shape on a base serving as a tip to form a skirt portion, which includes the blades. The entire shuttlecock is loaded into a mold that corresponds to the external shape of the base and skirt, and a mold jig that corresponds to the internal shape of the base of the skirt is placed.
Insert the blade inside the skirt part, sandwich the blade between the mold and the mold jig, and correct the installation angle of the blade.
The shape of the skirt portion is adjusted to a preferable shape. [Function] If the above adjustment is performed without heating the blade, there is a risk that the shaft of the blade may break or the cork base may crack. On the other hand, if the blade is heated while correcting the installation angle of the blade, the rachis and base will have appropriate flexibility, making it easier to adjust the shape of the skirt part. . However, the flight characteristics of a shuttlecock cannot be sufficiently improved simply by correcting the shape of each individual blade. In other words, even if the shape of each individual blade falls within the allowable range of the specified shape, flight characteristics will not improve unless the shape and mounting angle of the blades arranged around the entire circumference of the shuttlecock are balanced. It is. In this invention, the shape adjustment is performed by simultaneously sandwiching the blades around the entire circumference of the skirt portion between the mold and the mold jig. Therefore, each blade is not corrected separately, but the shape of the blade around the entire circumference of the skirt portion, the state of attachment to the table top, etc. can be uniformly corrected under the same conditions. As a result, there is no variation in the shape and mounting condition of the blades in the entire circumferential direction of the shuttlecock, resulting in an extremely well-balanced shuttlecock with good flight characteristics. Furthermore, since this invention uses a mold jig that corresponds to the inner shape of the base of the skirt, the shape of the base of the blade and the state of attachment to the base, which have the greatest impact on flight characteristics, can be accurately determined. At the same time, it is possible to prevent the tip side of the blade from being damaged by applying excessive pressure or deformation force to the tip side of the blade, which is thin and easily broken or damaged. [Embodiment] A method for adjusting the shape of a shuttlecock shuttlecock according to the present invention will be described below with reference to FIGS. 1 to 4 showing an example of the process. This shuttlecock A has a plurality of blades 21 planted in a circular shape on a base 1 serving as the tip, and threads 2
2 are connected (braided) to form a skirt portion 2. By the way, if the blades 21 are not planted properly, or if they become distorted during long-term storage, the shape of the skirt portion 2 will be distorted, as shown in FIG. 1. Therefore, first of all, such a shuttlecock A
is loaded into a mold 3 having a hole 3a in the correct shape of a shuttlecock A, as shown in FIG. Next, while heating the blade 21, a mold jig 4 for shape adjustment is inserted from behind the shuttlecock (from above in the figure). The portion of the hole 3a corresponding to the skirt portion has a conical shape with an inner diameter corresponding to the standard outer diameter of the skirt portion 2 and a taper corresponding to the installation angle of the blade. It is now possible to specify Furthermore, the molding jig 4 has an outer diameter corresponding to the standard inner diameter of the root of the skirt portion 2 and a taper corresponding to the planting angle of the root. When the mold jig 4 is inserted into the skirt portion 2, as shown in FIG.
is sandwiched between the mold jig 4 and the mold 3, and the rachis 21
The shape of the skirt portion 2, such as the angle of a with respect to the base 1 and the diameter of the base of the skirt portion, is suitably adjusted. As a result, as shown in FIG. 4, a distortion-free shuttle torque A is obtained. Although the heating temperature of the blade 21 is not particularly limited in the present invention, it is preferably within the range of 110 to 150°C. This is because, if the heating temperature is less than 110° C., the heating will not be sufficient, and there is still a risk that the rachis 21a may break or the stand 1 may crack. In addition, the heating temperature is 150℃
This is because, if the temperature exceeds this value, not only will workability, productivity, etc. deteriorate, but also there is a risk that each part constituting the shuttlecock A may be damaged (melted, made brittle, etc.) by heat, depending on the material. Therefore, the heating temperature of the blade 21 is preferably within the above range. In particular, about 130°C is more preferable. The heating means is not particularly limited in this invention,
Direct heating with a normal heater, hot air heating, etc. can be employed. In addition, when heating with heated steam, humidification can be performed at the same time, making adjustment easier. According to the above-described method for adjusting the shape of the shuttlecock vane of the present invention, the shape of the skirt portion of the shuttlecock with an irregular skirt shape can be suitably adjusted without damaging the shuttlecock itself, thereby reducing variations in flight characteristics. You will be able to get more shuttlecocks that fly well. Although the method for adjusting the shuttlecock blade shape of the present invention has been described so far based only on the above-mentioned drawings, the present invention is not limited to the examples shown in the above-mentioned drawings. For example, the devices for adjustment such as the mold 3 and the mold jig 4 are not limited to the structure shown in the above figure, but may have other structures. In short, this is a method for adjusting the shape of the skirt portion of a shuttlecock, which has a skirt portion formed by a plurality of blades planted in a circular shape on a base serving as the tip, and is a method for adjusting the shape of the skirt portion of the shuttlecock. Other configurations are not particularly limited as long as the shape of the blade is adjusted using a tool under heating. Next, embodiments of the invention will be described. (Example) Shuttlecocks classified into A, B, and C classes according to flight distance were adjusted using the device shown in the above figure, and the distribution of each class before and after adjustment was investigated. The results are shown in Table 1. The flying distance was measured in accordance with the following provisions in Article 4 "Shuttle" and Section 3 "Pace and Flight" of the Competition Rules compiled by the Japan Badminton Association. <Regulations> The shuttle is played by a player of normal strength.
If the ball is struck upwards with a full-swing underband stroke parallel to the sideline above the boundary line, and falls more than 300mm and within 760mm in front of the opposite back boundary line, it is at the correct pace. Suppose there is.

〔Effect of the invention〕

The method for adjusting the blade shape of a shuttlecock according to the present invention is as described above. In this adjustment method, the shape of the blade is adjusted under heating, and the shape of the skirt portion of the shuttlecock can be suitably adjusted without damaging the shuttlecock itself, thereby eliminating variations in flight characteristics. , you will be able to get more shuttlecocks that fly well. Moreover, since the mold and mold jig described above are used, while the outer shape of the shuttlecock base and skirt part is precisely controlled by the mold, the shape of the blades around the entire circumference of the skirt part can be simultaneously adjusted using the mold jig. This not only corrects the shape of each individual blade, but also corrects the shape and mounting condition of the blade in a well-balanced manner around the entire circumference of the shuttlecock.
The flight characteristics of the shuttlecock can be significantly improved.

[Brief explanation of the drawing]

Figure 1 is a front view showing a shuttlecock with a distorted skirt part, Figure 2 is a partially cutaway front view showing the shuttlecock being loaded into a shape adjustment device, and Figure 3 is a state in which the shape is being adjusted. FIG. 4 is a partially cutaway front view showing the shuttlecock without distortion after shape adjustment. A...Shuttlecock, 1...stand, 2...skirt part, 21...feather.

Claims (1)

[Scope of Claims] 1. A method for adjusting the shape of the blades of a skirt portion of a shuttlecock in which a skirt portion is formed by planting a plurality of blades in a circular manner on a base serving as a tip, the method comprising: , a mold corresponding to the external shape of the base and the skirt part is loaded, a mold jig corresponding to the internal shape of the base of the skirt part is inserted into the inside of the skirt part, and a mold jig is inserted between the mold and the mold jig. A method for adjusting the shape of a shuttlecock's blades, which is characterized by sandwiching the blades and adjusting the shape under heating. 2. A shuttlecock blade shape adjustment method according to claim 1, wherein the heating temperature of the blade is within the range of 110 to 150°C.