Simulation feather special for shuttlecock and shuttlecock

Abstract

The simulated feather special for the badminton comprises a feather piece (1) and a feather stem (2), the feather piece (1) further comprises two sheets (11), the feather stem (2) is completely or partially wrapped between the two sheets (11), at least one sheet is made of foaming materials, and the feather stem (2) is completely or partially made of bamboo materials. The feather stem (2) is made of a first layer of bamboo chips on the outer side of bamboo wood. The feather stem segment (221) on the upper half portion of the feather stem (2) is the key point of weight control, and the area of the cross section of the feather stem segment (221) ranges from 0.5 square millimeter to 1.3 square millimeters within the 75% length range of the feather stem segment (221). The bamboo materials are subjected to agent or resin permeation treatment or surface treatment. The feather stem (2) further comprises a structure reinforcing portion (21) made of plastic materials, and the structure reinforcing portion (21) wraps part of the feather stem (2) in a base body of the feather stem (2). The utility model further relates to the shuttlecock made of the special simulation feather for the shuttlecock.

Description

Technical Field

[0001] This utility model relates to a simulated feather and shuttlecock specifically for badminton. Background Technology

[0002] Using artificial materials to replace natural goose and duck feathers in the production of badminton shuttlecocks is an ideal for both the industry and the badminton community. Goose and duck feather shuttlecocks are too fragile, forcing players to frequently replace them and significantly increasing the cost of playing. Furthermore, the production process for goose and duck feather shuttlecocks is complex, and the material itself is expensive. However, the technical difficulties hidden behind this material replacement are beyond the imagination of most people. Publicly available information shows that related patent applications for simulated badminton shuttlecocks existed as early as the 1960s, such as Showa 36-19067, published on October 12, 1961. Slightly later, in the 1980s, patent applications for independent simulated feathers appeared, such as Showa 57-177782, published on November 1, 1982. The industry has been conducting related research for over 50 years, but to date, no artificial material used to replace goose and duck feathers has achieved the overall performance level of a high-quality goose feather shuttlecock. While existing nylon shuttlecocks with a full-length skirt (also called plastic shuttlecocks) are extremely durable, their overall performance is far from meeting the technical requirements of even slightly skilled amateur players, and they have been abandoned by professional athletes. It wasn't until 2007 that practical technology for using artificial feathers in badminton began to emerge; and shuttlecocks made with artificial feathers didn't appear on the market until after 2009. However, these shuttlecocks made with artificial feathers still suffer from being too heavy and having insufficient spin speed, and they haven't fully reached the level of high-quality goose feather shuttlecocks.

[0003] Badminton is a product that demands a very high level of technical refinement in its use. Through long-term practice and competition, athletes have developed a highly refined hitting experience. This experience is based on high-quality natural goose feathers, encompassing factors such as weight, speed, spin, the trajectory and stability of high clears, the stability of drop shots, the roll of short shots, the feel of the shot, the reaction speed upon impact, the sound of the shot, the accuracy of the landing point, and durability. Artificial material badminton shuttlecocks aim to approximate these factors as closely as possible to natural goose feathers.

[0004] The conditions under which badminton is used are extremely harsh, requiring it to withstand impacts unimaginable to the average person. The speed of a badminton shuttlecock is the fastest of all ball sports, and the time it takes to accelerate from the moment it's hit to its top speed is often only a fraction of a second. During this process, the shuttlecock must withstand accelerations of tens or even hundreds of Gs. In comparison, the acceleration of aerospace rockets is generally below 20 Gs, and that of manned spacecraft rockets is generally below 10 Gs. The cantilevered feathers of a badminton shuttlecock must withstand such high accelerations and wind resistance; the structural strength required is beyond human comprehension. Natural goose feather shafts have a natural internal porous structure, are lightweight yet strong, and their specific strength (mechanical strength under the same weight conditions) surpasses that of almost all currently available artificial materials. It is precisely for this reason that the simulation of a badminton shuttlecock has been unsuccessful for decades.

[0005] At least seven factors influence the overall performance of a badminton shuttlecock: weight, weight distribution, center of gravity position, shuttlecock support strength (radial support rigidity), frontal wind resistance (or axial wind resistance), around-axis wind resistance, and impact resistance. Correspondingly, three major technical challenges arise: material challenges, structural challenges, and manufacturing challenges. If any of these seven factors or three technical challenges fails to meet standards, the badminton shuttlecock will not be accepted by athletes and will be unlikely to achieve commercial success. Therefore, when evaluating the practicality of a new badminton technology, a comprehensive assessment of the seven factors and three challenges mentioned above is necessary. In other words, the small badminton shuttlecock is actually a systems engineering project, containing multiple subsystems that are closely interconnected, mutually restrictive, and mutually influential. Even a small adjustment to any subsystem will change the overall performance of the entire system. Looking at patent specifications spanning over 20 years, the vast majority focus on individual modifications to a single subsystem, and most are based on theoretical assumptions without practical verification. Therefore, almost all of them lack practicality or are impossible to implement. It is precisely for this reason that, after more than 50 years, as of 2007, no new type of badminton shuttlecock with practical value has emerged, except for goose and duck shuttlecocks and plastic shuttlecocks with defective performance.

[0006] The contradiction between weight, weight distribution and sphere strength is the most difficult factor to solve in the process of artificializing sphere materials. Furthermore, the sphere strength must simultaneously meet the contradictory indicators of rigidity and impact resistance.

[0007] A standard natural badminton shuttlecock consists of 16 feathers, and the total weight is generally between 4.74 grams and 5.50 grams. This weight range is not a concept of allowable error, but rather a matter of different weight requirements at different altitudes or atmospheric pressures. The center of gravity is approximately located near the junction of the shuttlecock's head and body. Specifically: standard feather length is generally around 75mm, and the weight of a single feather is less than 0.13 grams, while a single high-quality goose feather weighs around 0.11 grams. The total weight of the 16 feathers should ideally be controlled below 2.00 grams, with the total weight of the feather vane area (including the upper part of the shaft) that forms the aerodynamic skirt generally controlled within 1.1 grams, ideally between 0.90 and 1.0 grams. If the weight of the skirt exceeds the standard, the shuttlecock's flight performance will rapidly decline.

[0008] Badminton shuttlecocks are extremely sensitive to weight changes, with a sensitivity on the order of 0.1 grams. This means that in some critical areas, a weight change of just 0.1 grams can significantly alter the overall performance of the shuttlecock. For the vane area of ​​a single feather, the sensitivity reaches 0.01 grams. This means that if each feather increases by 0.01 grams, the entire shuttlecock's skirt will increase by at least 0.15 grams, severely impacting its flight performance. Currently, the skirts of most existing plastic and simulated feather shuttlecocks are excessively heavy. Ideally, the shuttlecock's center of gravity should fall near the junction of the shuttlecock head and the skirt. If the skirt is too heavy, the center of gravity shifts upwards, making the shuttlecock prone to tumbling. The closer to the top of the skirt, the more sensitive it is to excessive weight, as this is where the moment of force is greatest. From an engineering perspective, the lighter the shuttlecock's skirt, the better. Making a product lighter while maintaining sufficient support strength is a highly challenging technical problem. However, once ultra-lightweight skirt manufacturing technology is mastered, weight distribution becomes much easier. Some engineered badminton shuttlecocks, in an effort to reduce weight, have very thin skirts and shafts. While this achieves the desired weight, it compromises strength, causing the shuttlecock to lose spin. Stable spin is crucial for a shuttlecock's overall performance. Axial drag is what propels the shuttlecock's rotation around its axis. This rotation not only stabilizes the shuttlecock's flight but also effectively dissipates some of its kinetic energy. Furthermore, it acts as a decelerator when the shuttlecock is powerfully smashed, allowing it to travel at a speed more suited to the demands of the sport.

[0009] Another often overlooked but crucial factor affecting badminton flight performance is the phenomenon of sudden changes in wind resistance. If the skirt's support rigidity is insufficient, the skirt will deform drastically upon impact, then quickly return to normal. This contraction and expansion causes a dramatic change in wind resistance, resulting in a sudden shift in the shuttlecock's flight speed, as if the force has been released. While casual players may not perceive this speed change, they can clearly feel a difference in the shuttlecock's flight compared to a standard shuttlecock—the feel of the shot becomes strange, and the landing point becomes inaccurate. This is one of the main reasons why artificial material shuttlecocks are not accepted by athletes.

[0010] In terms of shuttlecock strength, there is always a difficult contradiction to reconcile rigidity, toughness, and weight—this is determined by the inherent properties of the materials themselves. In most cases, when the rigidity of a material increases, its toughness decreases accordingly, making the material brittle and less impact-resistant. For example, with feather shafts, increasing rigidity results in decreased toughness and increased weight, making them prone to breakage and causing excessive weight. If thinner shafts are used to reduce weight, the support of the shafts becomes insufficient, leading to the aforementioned abrupt change in wind resistance. Similarly, for the vanes, the wings require good support rigidity. Increasing the thickness of the vanes can improve the support rigidity and durability of the wings, but it will increase weight, causing a sharp decline in shuttlecock performance. Conversely, reducing thickness to reduce weight results in insufficient support rigidity and durability of the wings, and insufficient support rigidity of the wings will severely affect the shuttlecock's flight performance. For existing simulated feather vanes, weight reduction can be achieved by increasing the foaming ratio without changing the thickness, but this will also lead to a decrease in both the rigidity and impact resistance of the vane's wing support. The rigidity and strength of existing simulated feather shafts do not yet reach the level of natural goose and duck feather shafts, while their weight is slightly heavier. The weight of existing simulated feather vanes is much greater than that of natural goose and duck feather fibers. And a sufficiently strong yet lighter alternative material for the vane has not yet emerged. It can be said that every milligram of weight reduction achieved in simulated feathers, especially in the vane area, is invaluable.

[0011] Therefore, the development of artificial material badminton shuttlecocks always faces the mutual constraints of seven major factors and three major challenges; considering only one aspect of performance is insufficient. More importantly and with greater difficulty, no component of a simulated badminton shuttlecock is a simple engineering structure. It must withstand high speed and high impact while simultaneously fulfilling the aforementioned functional requirements for the hitting experience—including weight, weight distribution, center of gravity position, shuttlecock speed, spin, high clear trajectory, high clear stability, drop shot stability, drop shot roll, hitting feel, hitting sound, rebound reaction speed, landing accuracy, and durability, among more than ten other functional elements. Furthermore, the relationships between these functional elements and the structure are mostly implicit. Therefore, any structural improvements to simulated badminton shuttlecocks cannot and should not be judged simply by static or macroscopic mechanical support structures or mechanical linkages.

[0012] In its utility model patent application No. 2007100544123 (Publication No.: CN101306244A, Publication Date: November 19, 2008), filed on May 16, 2007, this patent holder first proposed a two-piece feather reinforcement component scheme, making artificial simulated feathers truly practical. Subsequently, related manufacturers successively launched artificial simulated badminton shuttlecocks based on this patented technology, using plastic material feather shafts or carbon fiber composite material feather shafts combined with two foam feather shafts, achieving good application results. However, in the more than ten years since the above-mentioned patented technology became practical, there is still a certain performance gap between the above-mentioned simulated badminton shuttlecocks and natural goose / duck badminton shuttlecocks. Therefore, user acceptance is not high, and market performance is poor. The main problem lies in the fact that the overall performance in terms of weight, support rigidity, and impact resistance is still difficult to achieve the balanced requirements of natural goose / duck badminton shuttlecocks, as analyzed in detail below.

[0013] The simulated feathers made of plastic shafts combined with double-foamed vanes have the following main problems: First, while ensuring the minimum required support rigidity and toughness, the simulated feathers are excessively heavy overall, including the feather heads. Therefore, only 15 feathers are used to make the shuttlecock—standard natural goose / duck shuttlecocks have 16 feathers. Even with this reduction of one feather, the overall weight of the feather head is still excessive, causing the shuttlecock's center of gravity to shift upwards, resulting in an unreasonable weight distribution and a significant performance gap compared to natural goose / duck shuttlecocks. Second, to improve the radial support rigidity of the shuttlecock's skirt, and due to weight limitations, the head of the plastic shaft must be flattened, with the flat surface pointing towards the skirt axis—meaning the flat surface is perpendicular to the vane. This design has two major drawbacks: Firstly, the circumferential support rigidity of the simulated feather head is insufficient. If the vane is thickened, the weight will increase further. Therefore, when the shuttlecock is hit, the vane will swing circumferentially, easily disrupting the layering order of the vanes and causing instability such as tail-wagging during flight. Therefore, this design incorporates a thin nylon thread on the skirt to restrain the layering of the feathers, mimicking the shape of a badminton shuttlecock with plastic shafts. However, the wobbling problem remains unresolved. Furthermore, because the feathers and the flattened ends of the shaft must be designed perpendicularly, and these ends are very thin, the pressure at the junction of the feathers is very high when hit, easily causing the feathers to be "cut" and crack.

[0014] The carbon fiber composite shaft combined with double-foamed blade design presents at least four problems: First, there are insurmountable manufacturing challenges. Carbon fiber composite shafts can only be formed using pultrusion, making it impossible to create a tapered structure with a large and small head in a single process. When the top and base of the shaft are of the same thickness, it results in a significant aesthetic defect: the base shaft is too thin, leading to insufficient strength and affecting the coil's stability when used with a shuttlecock. Thickening the shaft, on the other hand, results in excessive weight. If a secondary processing and grinding process is used to create the tapered shape, stress concentration occurs at the tapered area due to the inevitable breakage of local fibers, making it highly susceptible to cracking. Second, carbon fiber shafts also have a difficult-to-overcome aesthetic defect: they are black and difficult to color. Third, due to the extremely high rigidity and surface hardness of carbon fiber shafts, high-frequency vibrations occur during impact, which can fatally damage the blades, easily causing cracks at the joint line and severely impacting the shuttlecock's lifespan. Fourth, and more importantly, carbon fiber itself is highly irritating to the skin, even causing allergic reactions and swelling. When a feather shaft breaks, the carbon fiber filaments at the break point can easily come into contact with the skin, and the fine fibers will scatter in the air. If these fine fibers get into the eyes, it can have serious consequences. Since feathers breaking is inevitable in badminton, using carbon fiber shafts to make shuttlecocks poses a significant safety hazard.

[0015] The patent specification CN94245400.6, published on March 6, 1996, relates to artificial feathers made of bamboo, specifically: a feather blade made of fabric is glued to a feather shaft made of bamboo or carbon fiber to form an artificial feather. In reality, this solution is not feasible; nearly 30 years after its publication, it has still not become a reality. The patent CN 101530661A, published on September 16, 2009, issued by the applicant of this utility model, gives a negative assessment of the above solution, arguing that such artificial feathers have problems: the thin bamboo shafts are too heavy, making the artificial feathers used in badminton shuttlecocks excessively heavy, and their mechanical strength is insufficient. The industry also generally believes that bamboo material cannot be used to make practical artificial simulated feathers specifically for badminton shuttlecocks. To date, no simulated feather or badminton shuttlecock made of bamboo material has any practical value. However, guided by the principle of not overlooking any possibility, the applicant of this utility model does not easily dismiss any seemingly infeasible technical solutions. In cross-material testing, the inventors unexpectedly discovered that, with appropriate material selection and proper processing, a simulated feather made from bamboo and wood feather shafts combined with a double-layered, laminated feather design, particularly one incorporating foamed feather blades, can achieve a balance in weight, weight distribution, support rigidity, and impact resistance. The simulated feathers produced using this design outperform existing simulated feathers in overall performance, and largely eliminate the drawbacks of those existing designs. Further reinforcement of the bamboo and wood feather shafts with resin or chemicals further enhances their durability. Since the base of the feather shaft is most vulnerable to breakage when hit, reinforcing the shaft base with plastic materials yields even better results.

[0016] The rigidity, toughness (impact resistance), density, and ease of forming uneven weight distribution of the materials used to make simulated feathers are not readily apparent. These indicators are contradictory yet interconnected. More importantly, when the dimensions of the material shafts become sufficiently small, these strength indicators measured against standard test specimens do not necessarily correspond to the actual bending and impact resistance of the small-sized shafts. Impact resistance, in particular, is subject to various standards and testing methods, resulting in multiple indicator systems with no inherent conversion relationships, further reducing its guiding significance. Even simulated feathers made from materials with equivalent rigidity and strength (usually characterized by flexural modulus) exhibit significantly different impact resistance when their thickness or taper is altered, due to variations in deformation upon impact. This deformation cannot be too large or completely absent. As mentioned earlier, carbon fiber simulated feathers, due to their exceptional rigidity, exhibit very small impact deformation, but generate high-frequency vibrations upon impact, which reduce the lifespan of the feather shafts. Therefore, in the field of badminton simulated feather technology, the experimental application of any new material cannot be affirmed or denied without actual trial production and testing. Otherwise, the industry would not have been fruitless after decades of research on simulated feathers before 2007; furthermore, since the first practical simulated feathers appeared between 2007 and 2009, only two practical products—feather shafts made of specific polymer materials and those made of carbon fiber—have been launched to date, and their performance still lags significantly behind that of standard goose and duck shuttlecocks.

[0017] Because badminton is a sport product that highly depends on the hitting experience, even for standard natural badminton shuttlecocks used in competitions (goose and duck feather shuttlecocks), it is difficult to establish a systematic and quantitative technical standard for the technical requirements of individual goose and duck feathers and the whole shuttlecock. To date, there are no publicly available standardized and systematic technical indicators for simulated badminton feathers, let alone systematic technical indicators that have become industry standards. These interrelated and contradictory technical indicators currently only exist in the memos of various researchers and are constantly changing. Some publicly available technical indicators are also one-sided and relatively isolated. When other indicators change, these immature indicators must also be changed or even abolished. This is also reflected in the national standards for badminton. In the current national standard "Badminton" (GB / T 11881-2006), several clauses state that they need to be determined by professionals through actual play. For example: (1) 5.6 Characteristics requirements for superior badminton products: ... Characteristics are determined by professional personnel through actual play. (2) 6.8.1 Real-world test (testing landing characteristics): A professional hits the shuttlecock with full force from outside the end line of the court, using a low hand. The flight direction of the shuttlecock should be parallel to the sideline. The landing range of the shuttlecock is measured. (3) 6.9.2 The flight stability is judged by the professional's real-world test. (4) 6.13 For high-quality shuttlecocks, the flight characteristics and quality characteristics are judged by the professional's real-world test.

[0018] Therefore, research on simulated badminton feathers lacks readily available, systematic, and clearly defined technical specifications. Everything is done through trial and error. For simulated badminton feathers specifically designed for badminton, any subtle improvement requires a series of steps, including feather production (generally without readily available equipment), shuttlecock production (often impossible with existing equipment), test runs, and further refinement, before evaluation can be made. Furthermore, each person's evaluation experience often differs. Therefore, any subtle improvement to simulated badminton feathers cannot be simply considered obvious.

[0019] It is important to note that the development goal of this utility model of simulated badminton feathers and shuttlecocks is to approximate and reach the performance of regular sports-grade goose / duck badminton shuttlecocks, and even competition-grade goose / duck badminton shuttlecocks, to the greatest extent possible. Therefore, when discussing the patentability of the technical solutions in this application, it is necessary to distinguish them from craft badminton shuttlecocks and toy badminton shuttlecocks. For craft badminton shuttlecocks and toy badminton shuttlecocks, there is no need to consider the hitting experience as much; therefore, the selection of materials is more extensive, and even metal wire can be used to reinforce the feather shaft or as material for the waist coil. Obviously, some technical solutions of craft badminton shuttlecocks and toy badminton shuttlecocks cannot be used as reference solutions for conventional sports-grade badminton shuttlecocks. Therefore, some prior conjectural solutions that have not been proven in practice cannot be simply and presumptuously dismissed as inventiveness of this application. Utility Model Content

[0020] The technical problem to be solved by this utility model is to provide high-performance simulated feathers for badminton shuttlecocks. Another technical problem to be solved by this utility model is to provide badminton shuttlecocks made of high-performance simulated feathers.

[0021] To solve the above-mentioned technical problems, this utility model provides a simulated feather for badminton, comprising a vane and a shaft. The vane comprises at least two sheets, with all or part of the shaft encased between the two sheets. At least one of the sheets is made of foamed material, and all or part of the shaft is made of bamboo or wood. Further, one of the sheets is made of a thin film with a thickness of no more than 0.03 mm. Preferably, both sheets are made of foamed material. Another simulated feather for badminton, also of this utility model, comprises a vane and a shaft, with all or part of the shaft made of bamboo or wood. The cross-sectional area of ​​the shaft is less than or equal to 2.0 square millimeters over 70% of its length.

[0022] The vane area of ​​a simulated badminton feather is particularly sensitive to excessive weight. For ease of technical control, the shaft is divided into two sections: the upper section within the vane body is the shaft section, and the lower section below the vane body is the shaft support section. Within 75% of the length of the shaft section, its cross-sectional area is less than or equal to 1.7 square millimeters. Preferably, within 75% of the length of the shaft section, its cross-sectional area is less than or equal to 1.5 square millimeters. Further, within 75% of the length of the shaft section, its cross-sectional area is between 0.5 square millimeters and 1.3 square millimeters. Preferably, within 70% of the length of the shaft support section, its cross-sectional area is less than or equal to 2.0 square millimeters. Further, within 70% of the length of the shaft support section, its cross-sectional area is between 1.0 square millimeters and 1.8 square millimeters. Regarding the concept of "feather body," the following explanation is provided: Some simulated feathers have an extended tail extending downwards at the end. The feather body described in this invention does not include the extended tail portion. The length of the feather body in a conventional badminton shuttlecock feather is generally between 35mm and 40mm. Therefore, the shaft section is essentially the portion extending downwards from the tip, approximately 35mm to 40mm. When the simulated feathers of this invention are used to make a shuttlecock, the lower part of the shaft support section is inserted into the shuttlecock head base, and the upper part of the shaft support section is wound and fixed by a waist coil. When a feather insertion frame is used on the shuttlecock, the shaft support section of the simulated feather is directly inserted into the feather insertion frame.

[0023] Preferably, the feather shaft has a structure that is thicker at one end and thinner at the other, or thicker in the middle and thinner at both ends. Preferably, the cross-sectional shape of the feather shaft body is circular, square, rectangular, trapezoidal, or triangular. In actual manufacturing, the thickness of the feather shaft body is often controlled by controlling its diameter or side length. However, since the dimensional standards for various shapes differ, this invention unifies the dimensional standards for various shapes by controlling their cross-sectional area. When using a cylindrical rod or a tapered cylindrical rod, the diameter of the feather shaft body should preferably not exceed 1.5 mm within 70% of its length. Most preferably, the diameter of the feather shaft section should be between 0.8 mm and 1.3 mm within 75% of its length. When using a square column rod or a tapered square column rod, the side length of the cross-section should preferably not exceed 1.4 mm within 70% of its length. Most preferably, the side length of the cross-section should be between 0.7 mm and 1.2 mm within 75% of its length. For rectangular cross-section rods, the cross-sectional area is the primary control factor. When using an approximately triangular column, the side length of the longest side of the cross-section within 70% of the length of the main body of the feather shaft should preferably not exceed 2.0 mm. Most preferably, the side length of the cross-section within 75% of the length of the feather shaft segment is between 1.0 mm and 1.6 mm. To avoid deliberately enlarging the dimensions locally by adding reinforcing ribs or similar means to circumvent the protection scope of this utility model, when setting the cross-sectional area of ​​the feather shaft, the main body of the bamboo or wood material of the feather shaft does not include the reinforcing rib structure of the bamboo or wood material itself or any other added reinforcing structure.

[0024] Considering factors such as excessive weight and inconvenience in shape processing, a preferred embodiment is that the feather shaft further includes a structural reinforcement portion, which partially encapsulates the feather shaft within its matrix. Preferably, the structural reinforcement portion is located in the lower half of the feather shaft. Preferably, the structural reinforcement portion is made of plastic material. Further, the structural reinforcement portion is injection molded from plastic material. Preferably, the cross-sectional outer contour of the structural reinforcement portion is square, rectangular, or polygonal.

[0025] Furthermore, the bamboo and wood material undergoes chemical or resin infiltration treatment or surface treatment. The infiltration treatment mainly involves impregnation or pressure injection, while the surface treatment mainly involves coating. Another preferred option is that the bamboo and wood material undergoes carbonization treatment. The above treatment methods can effectively improve the strength of the feather shaft. For bamboo, the outer bamboo layer has relatively high strength; therefore, the following approach can be adopted: all or part of the feather shaft is made from thin bamboo stalks, and these thin bamboo stalks contain an outer bamboo sheath structure. Preferably, the feather shaft is made from the outermost first layer of bamboo strips.

[0026] This utility model also relates to a badminton shuttlecock made using the aforementioned simulated feathers specifically designed for badminton. For simulated feathers with a reinforcing section, the characteristic feature is that the simulated feathers are inserted into the shuttlecock head through their structural reinforcing section. Preferably, a feather-embedding frame is also included between the simulated feather and the shuttlecock head. Adding the feather-embedding frame allows the simulated feather to be made shorter; preferably, the total length of the simulated feather is between 45mm and 65mm. Further, the total length of the simulated feather is set to 50mm ± 2mm or 60mm ± 2mm. Using the feather-embedding frame, since the simulated feather is located at the top of the shuttlecock, the shaft can be made thinner for weight considerations. Preferably, the cross-sectional area of ​​the simulated feather shaft body is between 0.5 square millimeters and 1.3 square millimeters within 75% of its length. The outer diameter or side length of the cross-section of the main shaft body of the simulated feather is between 1.0mm and 1.3mm. Further, the main shaft body of the simulated feather is a cylindrical shaft, a square prism shaft, a triangular prism shaft, or a trapezoidal prism shaft.

[0027] This invention relates to simulated feathers specifically designed for badminton, which are simple to manufacture, have a reasonable weight distribution, and good rigidity. Furthermore, the materials are readily available and inexpensive. Badminton shuttlecocks made from these feathers exhibit excellent performance, good durability, and even lower cost. Attached Figure Description

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of a simulated feather structure for badminton shuttlecocks, which is a specific invention.

[0030] Figure 2 This is a schematic diagram of a simulated feather for badminton shuttlecocks, including a structural reinforcement section, according to this utility model.

[0031] Figure 3 This is a schematic diagram of a badminton shuttlecock using the simulated feathers specifically designed for badminton according to this utility model. Detailed Implementation Example 1

[0032] like Figure 1 As shown, the present invention provides a simulated feather specifically for badminton, comprising a vane 1 and a shaft 2. The vane 1 further comprises two lightweight sheets 11, with the two lightweight sheets 11 covering the upper part of the shaft 2 between them. At least one of the two lightweight sheets 11 is made of foam material. The shaft 2 is made of bamboo. Suitable wooden shafts can also be used to make the shaft 2.

[0033] In this embodiment, the feather shaft 2 is made of bamboo stalks, with a circular cross-section and an overall tapered structure. For example... Figure 2As shown, the feather shaft 2 is divided into an upper section and a lower section, limited by the coverage area of ​​the feather vane 1. The upper section is the feather vane section 221, which is slightly thinner; the lower section is the feather shaft receiving section 222, which is slightly thicker. The diameter of the feather shaft receiving section 222 is 1.4 mm, and the diameter of the tip of the feather vane section 221 is 1.0 mm, extending tapered towards the feather shaft receiving section 222 to a diameter of 1.3 mm or directly to 1.4 mm. The cross-sectional shape of the bamboo feather shaft 2 of this invention can also be designed into other shapes, such as square, rectangular, trapezoidal, triangular, or other irregular shapes. However, it is essential to control the cross-sectional area of ​​its main body to control the overall weight of the feather shaft 2. In this embodiment, the cross-sectional area of ​​the feather vane section 221 within 75% of its length is between 0.7 square millimeters and 1.3 square millimeters. The cross-sectional area of ​​the feather shaft receiving section 222 within 70% of its length is between 1.3 square millimeters and 1.55 square millimeters. The cross-sectional area of ​​feather shaft 2, spanning 70% of its overall length, ranges from 0.7 square millimeters to 1.55 square millimeters.

[0034] In this embodiment, the feather shaft 2, made from bamboo stalks, is sourced from the outer first layer of bamboo strips. Retaining a certain amount of the bamboo outer layer during production is highly beneficial for strength. To further enhance the strength of the feather shaft, the bamboo or wooden stalks used for making the shaft can be soaked in resin or a chemical agent, allowing for thorough penetration and then drying or curing. Carbonization treatment of bamboo and wood materials can also improve strength to some extent and provide mold and insect resistance.

[0035] Feather types Weight of a single feather (g) Total weight of the ball (g) Comparison of radial support strength of ball skirt Ball juggling stability Stability of returning after a strong impact This application simulates feathers. 0.11 4.85 \ Stablize Swift and stable return Natural goose and duck feathers 0.12 5.01 Each ball's skirt was compressed into a semi-circle, with comparable strength. Stablize Swift and stable return Commercially available plastic feather shafts 0.15 5.36 The contact surface of the sphere in this application is significantly convex outward, while the contact surface of the contrast sphere is significantly concave inward, making this application clearly stronger. Easy to roll There was a tail wagging phenomenon when turning around. Commercially available carbon fiber shaft feathers 0.13 5.16 The contact surface of the sphere in this application is slightly convex outward, while the contact surface of the sphere is slightly concave inward. This application is slightly stronger. Stablize There was a slight tail wagging when turning around.

[0036] Example 2

[0037] like Figure 2 As shown, the badminton-specific simulated feather of this embodiment, based on Embodiment 1, further includes a structural reinforcement section 21 in the lower half of the feather shaft 2, i.e., the feather shaft insertion section 222. The structural reinforcement section 21 is injection molded from plastic. The structural reinforcement section 21 encapsulates the root of the feather shaft within its matrix, thereby increasing the root strength and allowing for easy modification of the cross-sectional shape. This facilitates maintaining the stability of the simulated feather's angle during implantation into the shuttlecock head and subsequent operations. The outer contour of the cross-section of the plastic structural reinforcement section is preferably square, rectangular, or polygonal.

[0038] like Figure 3 As shown, when the simulated feathers are made into a badminton shuttlecock, the simulated feathers are inserted into the shuttlecock head through their structural reinforcement part 21. Example 3

[0039] This utility model discloses a badminton shuttlecock, comprising a shuttlecock head, simulated feathers, and a feather-planting frame. The simulated feathers are based on the simulated feathers for badminton shuttlecocks described in Embodiment 1 above. An integrated feather-planting frame replaces the structural reinforcement 21 of Embodiment 2. The feather-planting frame includes two reinforcing rings (equivalent to the waist coils of a conventional badminton shuttlecock) and a feather-planting tube, in which the simulated feathers are inserted. In this embodiment, the simulated feathers can be made shorter, with an overall length of 50mm, and the feather shaft 2 uses a cylindrical rod with a diameter of 1.2mm. This embodiment eliminates the need for coils, making manufacturing more convenient.

[0040] Alternatively, a feather-planting frame with a strong loop can be used in conjunction with a coil to make the ball. In this case, the length of the simulated feather is increased to about 60mm, which is still much shorter than the standard 75mm natural goose and duck feather.

Claims

1. A simulated feather for badminton, comprising a vane (1) and a shaft (2), characterized in that, The feather (1) comprises at least two sheets (11), and all or part of the feather shaft (2) is covered between the two sheets (11). At least one of the sheets (11) is made of foam material, and all or part of the feather shaft (2) is made of bamboo or wood material.

2. The simulated feathers for badminton as described in claim 1, characterized in that, Of the sheet (11), the other sheet is made of a thin film with a thickness of no more than 0.03 mm.

3. The simulated feathers for badminton as described in claim 1, characterized in that, The feather stalk (2) is made from the first layer of bamboo strips on the outside of bamboo.

4. The badminton shuttlecock-specific simulated feather as described in claim 1, 2, or 3, wherein the feather shaft (2) is divided into two sections, wherein the upper section within the body of the feather vane (1) is the feather shaft section (221), and the lower section below the body of the feather vane (1) is the feather shaft support section (222), characterized in that, Within 75% of the length of the feather segment (221), its cross-sectional area is less than or equal to 1.7 square millimeters.

5. The simulated feathers for badminton as described in claim 4, characterized in that, The cross-sectional area of ​​the feather peduncle segment (221) is between 0.5 square millimeters and 1.3 square millimeters over 75% of its length.

6. The simulated feathers for badminton as described in claim 4, characterized in that, Within 70% of the length of the feather peduncle (222), its cross-sectional area is less than or equal to 2.0 square millimeters.

7. The simulated feathers for badminton as described in claim 6, characterized in that, The cross-sectional area of ​​the feather peduncle (222) is between 1.0 square millimeters and 1.8 square millimeters over 70% of its length.

8. The simulated feathers for badminton as described in claims 1, 2, 3, 5, 6, or 7, characterized in that, The bamboo and wood materials are treated with resin infiltration, chemical infiltration, carbonization, or resin surface treatment.

9. The simulated feathers for badminton as described in claims 1, 2, 3, 5, 6, or 7, characterized in that, The feather quill (2) further includes a structural reinforcement (21) that partially encapsulates the feather quill (2) within its matrix.

10. A badminton shuttlecock, comprising simulated feathers and a shuttlecock head, characterized in that, The simulated feathers used are the simulated feathers specifically for badminton as described in claims 1, 2, 3, 5, 6 or 7.

11. A badminton shuttlecock as described in claim 10, characterized in that, A feather-planting frame is also included between the simulated feathers and the ball head.

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