A shuttlecock

Abstract

The utility model discloses a new badminton scheme, under the condition of keeping the flight performance of badminton unchanged, provide better badminton durability and more extensive feather applicability. The badminton of this patent application includes ball head and feather blade, and the feather blade is arranged and inserted in the ball head in ring shape, and reinforcing coil is arranged on the feather blade, the feather blade is composed of natural feather and core rod, the core rod includes insertion section and connecting section, the natural feather includes hair pole and feather wing, the insertion section of core rod is inserted into the hair pole of natural feather and is fixedly connected with the hair pole, and the connecting section of core rod is inserted into the ball head and is fixedly connected. The badminton of the utility model can be made of short pole feather, and the core rod shares the stress of the hair pole together, which is closer to the hitting feeling of all-natural badminton, and has better durability.

Description

Technical Field

[0001] This utility model relates to a ball for sports, specifically a badminton shuttlecock with a special feather structure. Background Technology

[0002] Badminton is a widely popular ball sport internationally. China, Indonesia, and Malaysia are among the country's badminton powerhouses, boasting numerous outstanding players and a large number of enthusiasts. In Europe, countries like the UK, Denmark, and Germany also have widespread participation, and the sport's popularity has been steadily increasing in recent years. This patent application primarily targets badminton shuttlecocks used by experienced badminton enthusiasts in recreational, competitive, or athletic settings, and even by athletes in training and matches. It does not target plastic shuttlecocks or other children's recreational shuttlecocks.

[0003] like Figure 1 As shown, a standard badminton shuttlecock consists of a head and feathers. The head is the part of the shuttlecock that contacts the racket, playing a role in absorbing shock, transmitting force, determining flight direction, and maintaining stability during impact. Next are the feathers, the key component for generating aerodynamics. Their material, arrangement, and number directly affect flight stability and durability, determining the shuttlecock's trajectory. Feathers are mainly divided into two categories: goose feathers and duck feathers. According to the Badminton World Federation (BWF) regulations, a standard shuttlecock has 16 feathers, typically between 62 and 70 millimeters in length. The feather shafts are inserted into pre-drilled holes in the head and secured with special glue. The feathers are arranged in a specific way to form a roughly conical frame. Two reinforcing coils are installed on the feather shafts, strengthening both the overall strength of the 16 feathers as a single coil and the strength of the individual feather shafts.

[0004] While a single badminton shuttlecock itself does not present any technical problems, badminton shuttlecock production as an industry faces significant issues and challenges. The current situation and its causes mainly include the following aspects:

[0005] 1. Feathers are easily damaged

[0006] Badminton is the fastest sport in the world, with athletes often hitting the shuttlecock at speeds exceeding 400 km / h. This is because the shuttlecock itself is relatively light, with a single shuttlecock typically weighing around 5 grams. Furthermore, the athlete's grip on the racket increases the whipping torque during the arm swing, resulting in extremely high shuttlecock speed at the moment of impact. This causes significant vibration and impact to the shuttlecock head and feathers, easily leading to damage and breakage of the feather shaft. This is one of the reasons why feathers are easily damaged.

[0007] Secondly, the trajectory of a badminton shuttlecock is a typical deceleration trajectory. At the moment of impact, the shuttlecock's speed is extremely high. Since the flight resistance mainly acts on the wing part of the shaft, the shaft is deformed and bent under pressure. Subsequently, during flight, the shaft's resilience causes it to vibrate and recover, causing the wings to open. During flight, the shuttlecock decelerates rapidly, and the shaft is constantly vibrating and deforming. This is the second reason why feathers are easily damaged.

[0008] Finally, the length of the feathers in a badminton shuttlecock accounts for a very large proportion of its overall length, presenting a typical "top-heavy" state. When hitting the shuttlecock, the head faces the direction of flight, so there will be a "turnaround" situation with each hit. When dealing with certain situations, athletes will deliberately create the rotation and tumbling of the shuttlecock, causing the racket to fail to hit the head accurately and instead hit the side of the shuttlecock, resulting in damage to the shaft and wings. This is the third reason why the feathers are easily damaged.

[0009] The structure of a badminton shuttlecock means that damage to any feather in its ring will reduce the overall flight stability of the shuttlecock. Damage to feathers in different locations and in different numbers will have varying degrees of impact on the shuttlecock's flight, eventually requiring replacement. As a result, the number of shuttlecocks consumed during the game is extremely high.

[0010] 2. Feather supply issue

[0011] Currently, the mainstream badminton shuttlecocks are still made from strictly selected natural duck or goose feathers. Since the speed and stability of a badminton shuttlecock during flight are mainly determined by the feathers, the requirements for the feathers during manufacturing are extremely high. Under the same conditions, theoretically, a shuttlecock made from 16 completely identical feathers would produce the most perfect effect. However, since feathers are a natural product, it is obviously impossible to make them completely identical. Therefore, the first step is to classify the feathers.

[0012] In natural feathers, there are many parameters related to badminton shuttlecocks, such as the breed from which the feathers come, the thickness, curvature, and arch of the feather shaft, and the shape of the wing. For example, the wing can be divided into full circle, large square, medium square, small square, hunchback, single-sided, etc., and further divided into left wing and right wing of ducks or geese, and whether the feather is left-handed or right-handed. Different types of feathers cannot be mixed. Making a high-quality badminton shuttlecock requires 16 feathers with similar conditions in all aspects. As a result, although the structure of the badminton shuttlecock itself is very simple, the actual industrialization is difficult, and maintaining quality stability is even more difficult.

[0013] Due to the aforementioned problems, people have been searching for alternatives to natural feathers in order to achieve low-cost industrial production of badminton shuttlecocks. However, after decades of development, this has not yet been achieved. Chinese patent application CN2226477Y is for a shuttlecock made of artificial materials, filed in 1995. In recent years, major well-known badminton manufacturers have increased their investment and made various attempts, but so far, no industrialized product that can replace natural feather shuttlecocks has emerged.

[0014] Another solution to the industrialization problem of badminton is to expand the range of usable feathers. One common approach is to use feathers with short shafts to make shuttlecocks, thus addressing the issue that some feathers are unsuitable for shuttlecock production due to shaft length limitations. Based on this idea, two main directions have emerged.

[0015] Firstly, the single feather shaft is extended. Chinese patent CN102475959A, entitled "A Badminton Shuttlecock," describes a shuttlecock comprising multiple feathers and a head. The feathers are securely connected to the head with straps. Each feather includes a feather body and a connecting rod, which are fixedly connected. The feather body is connected to the head via the connecting rod. In this patent, the connecting rod is tubular, specifically a polygonal or circular tube, ranging from triangular to hexagonal. Similar solutions include CN209060480U, a feather for a badminton shuttlecock; and CN212327366U, a two-section feather for making a badminton shuttlecock. All of these patents extend the feather shaft by adding a sleeve, which is then connected to the head.

[0016] Secondly, a single feather-planting frame is constructed, which is fixed to the shuttlecock head, and the feathers are fixed to the feather-planting bracket. For example, CN101703833B, a patent for a badminton shuttlecock, describes a shuttlecock composed of two parts: a leaf and a shuttlecock base. The shuttlecock base consists of a shuttlecock head, a feather-planting frame, and tape or a tape substitute. The feather-planting frame consists of multiple feather-planting tubes and connecting ribs, and is equivalent to the feather shaft and string of a traditional badminton shuttlecock. The shuttlecock base is equivalent to the combination of the shuttlecock head, feather shaft, string, and tape of a traditional badminton shuttlecock. The upper end of the leaf is the feather blade, and the lower end is the root. The root of the leaf is inserted into the feather-planting tube. Building upon this foundation, subsequent patent applications have been filed, such as CN102580297B, a badminton shuttlecock without connecting ribs; CN103127682B, a badminton shuttlecock connecting device; CN107626092B, a badminton shuttlecock and its head and their manufacturing method; CN208081791U, a three-section badminton shuttlecock feather insertion frame, and many other related patents. Chinese patent CN103933716A, a grafted badminton shuttlecock, also provides a technical solution including a one-piece molded, integral feather fixing rod, into which feathers are inserted.

[0017] However, both of the above technical solutions have typical problems. Since both the integral feather support and the separate sleeve are solutions that insert the feather shafts, it is equivalent to extending the structure of the shuttlecock head, which brings several serious problems: (1) Weight balance problem. The sleeve combined with the shuttlecock head is equivalent to the shuttlecock head of a traditional badminton shuttlecock. The change in structure leads to an increase in the overall length of the shuttlecock head, which changes the weight balance. Under the same shuttlecock head material, the overall center of gravity of the badminton shuttlecock shifts upward (towards the feather tip), affecting the rotation speed of the shuttlecock head after hitting, especially during the flight of the shuttlecock at the net, which is reflected in the reduced rotation of the shuttlecock after a drop shot. (2) Change in the deformation torque of the feather shaft. In the above solutions, the sleeve must be made of rigid material. Otherwise, the feathers will sway uncontrollably during the high-speed movement of the badminton shuttlecock, which will seriously affect the flight stability and make the badminton shuttlecock unusable. However, because the sleeve is a ring structure, the shorter sleeve provides rigid support to the inner and outer sides of the feather shaft compared to the inner and outer sides of the feather. Furthermore, the diameter of the sleeve needs to be larger than the feather shaft, which obviously makes the sleeve less flexible. In the above technical solutions, a shorter feather shaft length than that used in traditional badminton shuttlecocks is used. After receiving support, the bendable length of the shaft is further reduced. Under the same hitting force, with the flight drag generated by the wing remaining unchanged, the bending point moves further towards the wingtip. This means that the shorter shaft length bears the same bending force, increasing the shaft pressure and making it more prone to brittle breakage. Utility Model Content

[0018] Based on this, the present invention provides a new badminton shuttlecock solution that, while maintaining the same flight performance, offers better shuttlecock durability and wider applicability of feathers.

[0019] This utility model discloses a badminton shuttlecock, comprising a shuttlecock head 1 and feather blades. The feather blades are arranged in a ring and inserted into the shuttlecock head 1. A reinforcing coil 6 is wound around the feather blades. The feather blades include natural feathers 2 and a core shaft 5. The core shaft 5 includes an insertion section and a connecting section. The natural feathers 2 include a feather shaft 3 and a feather 4. The insertion section of the core shaft 5 is inserted into the feather shaft 3 of the natural feathers 2 and fixedly connected to the feather shaft 3. The connecting section of the core shaft 5 is inserted into the shuttlecock head 1 and fixedly connected.

[0020] The aforementioned shuttlecock also includes standard shuttlecock feathers. Feather blades and standard shuttlecock feathers are respectively inserted into the shuttlecock head 1 to form a shuttlecock, allowing for mixed use of feather blades and standard shuttlecock feathers. Standard shuttlecock feathers refer to the feathers commonly used in shuttlecocks on the market, which can be standard natural duck feathers, natural goose feathers, or artificial feathers made of various artificial materials. In other words, the shuttlecock described in this patent application can be made entirely using the feather blades described in the patent, or a combination of the feather blades described in the patent and standard shuttlecock feathers can be used to launch shuttlecocks that combine reasonable price, comfortable feel, and good durability according to market needs.

[0021] In the aforementioned badminton shuttlecock, the reinforcing coil 6 is provided with at least one turn; when the reinforcing coil 6 is one turn, it is wound around the shaft 3; when the reinforcing coil 6 is more than one turn, at least one turn of the reinforcing coil 6 is wound around the shaft 3 of the natural feather 2. Preferably, two reinforcing coils 6 can be used to maintain consistency with commonly available badminton shuttlecocks on the market.

[0022] In the aforementioned badminton shuttlecock, the shaft 3 does not directly contact the head 1, or the length of the shaft 3 inserted into the head 1 is no more than 5mm. In general badminton shuttlecocks, the shaft is inserted into the head for at least 10mm to ensure a stable connection between the feathers and the head. If the insertion length is less than 10mm, the feathers easily separate from the head during impact, rendering the shuttlecock unusable. However, in the solution of this patent application, the shaft 3 is not a key structure for fixed connection to the head, and to reduce the transmission of vibration from the head to the shaft 3, the insertion length is no more than 5mm.

[0023] In the aforementioned badminton shuttlecock, the natural feather 2 has a length of 40 mm to 68 mm.

[0024] In the aforementioned badminton shuttlecock, the cross-sectional shape of the core rod 5 is non-circular. This non-circular shape makes it less likely for the core rod 5 to rotate within the shuttlecock 3 after it is inserted and fixed.

[0025] In the aforementioned badminton shuttlecock, the core shaft 5 has a relatively wide side in its cross-sectional shape. The core shaft 5 is arranged along the circumferential direction formed by the arrangement of the feather blades along the relatively wide side, or the acute angle between the core shaft 5 and the circumferential direction is less than 45 degrees. The relatively wide side refers to the direction in which the distance between the two endpoints of a non-circular cross-sectional plane is relatively long, and vice versa. As for the slender core shaft 5, when bending is required, the relatively wide side is where the core shaft 5 is more likely to bend. Therefore, arranging the core shaft along the circumferential direction with the relatively wide side can play a bending guiding role. When the shuttlecock is hit and flies out, it better guides the entire ring of natural feathers 2 to contract and bend inward along the circumferential direction formed by the arrangement of the core shaft 5. Setting an angle in the circumferential direction allows the shuttlecock to form a better spin during flight, thereby achieving better flight stability.

[0026] In the aforementioned badminton shuttlecock, the core shaft 5 has a rectangular cross-sectional shape.

[0027] In the aforementioned badminton shuttlecock, the core shaft 5 is inserted into the feather shaft 3 for a length of not less than 5 millimeters.

[0028] In the aforementioned badminton shuttlecock, the mass-to-length ratio of the core shaft 5 is no greater than 4 g / mm.

[0029] In the aforementioned badminton shuttlecock, the core shaft 5 is made of carbon fiber, titanium alloy, aluminum, aluminum alloy, plastic, wood, or bamboo.

[0030] In the aforementioned badminton shuttlecock, the cross-sectional area of ​​the core shaft 5 is not greater than the maximum cross-sectional area of ​​the feather shaft 3.

[0031] The technical solution of this utility model has the following beneficial effects:

[0032] This invention relates to a badminton shuttlecock that uses a core shaft to connect the shuttlecock head to the feathers. When using short-shafted feathers, the core shaft can share the bending force of the shuttlecock shaft, offering significant advantages over the sleeve connection method. As the sport with the fastest shuttlecock speed, most shuttlecock wear and tear is due to feather damage. The core shaft structure in this patent application, being thinner than the feather shaft, provides better bending performance than the sleeve for inserting feathers, all other things being equal. When the shuttlecock travels at high speed after impact and the feather shaft bends, the bending begins more easily from the core shaft. Even when used with short-shafted feathers, the overall bending length of the feather blade, from the exposed part of the shuttlecock head to the tip, remains relatively unchanged. In contrast, because the sleeve is thicker, bending can only begin from the top of the sleeve, i.e., the part of the feather shaft protruding outside the sleeve, resulting in a shorter bendable length. When the wings are subjected to the same force, a longer bending length can better distribute the bending force, thereby enabling the core rod and the feather rod to share the bending force, thus protecting the feather rod and enhancing its durability.

[0033] Meanwhile, compared to traditional badminton shuttlecocks, this utility model reduces the direct contact length between the shuttlecock shaft and the head, thereby reducing the direct transmission of vibration from the head to the shaft. In traditional badminton shuttlecocks, the shaft is glued to the hole in the head, and the racket's whipping force is directly transmitted to the shaft through the head and glue. In contrast, the utility model in this patent application requires the whipping force to pass through the head, glue, core shaft, and glue again before reaching the shaft, resulting in a longer transmission process and better vibration dispersion. Furthermore, the shuttlecock shaft itself is a hollow structure with a loose, fleshy structure inside, providing better vibration absorption and further reducing the impact on the shaft.

[0034] Furthermore, the core shaft of this invention is stronger than the shaft of natural feathers, and because it is manufactured using industrial methods, there is no decrease in stiffness at the core shaft location. The thinner core shaft, compared to a sleeve design, makes material selection and weight adjustment easier, achieving better resilience at the same weight and more closely mimicking the feel of a real badminton shuttlecock.

[0035] This invention, while using a core rod, still ensures that at least one reinforcing coil is directly fixed to the feather shaft, unlike the method used with a feather grafting frame where each feather is independently connected to the frame. This prevents adjacent feathers from sharing the load, ensuring even stress distribution and extending feather lifespan. Simultaneously, the reinforcing coil enhances grip on the feather shaft, preventing separation of the feather shaft and core rod, thus improving product stability.

[0036] More preferably, in the badminton shuttlecock of this invention, the cross-sectional shape of the core shaft is non-circular, including a relatively wide side. When arranged, the relatively wide side is arranged along the circumferential direction formed by the feathers. When the feather wings bear pressure and cause the shaft to bend, because the core shaft has a relatively wide side, it can guide the shaft to bend along the plane where the relatively wide side of the core shaft is located. This can ensure that the direction of bending of the shaft is more consistent each time, thereby improving the stability of the shuttlecock during flight.

[0037] The shuttlecock of this invention features a core shaft that is thinner than the feather shaft, allowing for greater adjustability of the shuttlecock's speed. As is well known, the feathers of a badminton shuttlecock open outwards, forming an inverted cone shape. The greater the outward angle of the feathers, the greater the drag on the shuttlecock's flight, thus affecting its speed. However, because the feather shaft is relatively thick, and the shuttlecock head has a limited volume while 16 feathers are inserted circumferentially, if the outward angle is too large, the portion of the feather shaft inserted into the shuttlecock head, being converging towards the tip in a cone shape, is more prone to spatial interference within the shuttlecock head. This can even affect the overall strength of the shuttlecock head and the firmness of the connection between the feather shaft and the head, potentially causing the shuttlecock head and the feather shaft to separate. This explains why common shuttlecock speeds are 76, 77, and 78 (the higher the number, the faster the speed), while shuttlecocks with speeds below 74 are difficult to manufacture (slow-speed shuttlecocks are needed at high altitudes). This invention uses a thinner core shaft inserted into the shuttlecock head for fixation. Compared to ordinary badminton shuttlecocks, the thinner core shaft allows for a wider range of angles when inserted into the shuttlecock head. Compared to a thicker core shaft, it offers more options, enabling a larger outward spread angle of the feather blades and greater flexibility in selecting the shuttlecock speed.

[0038] The core shaft structure of this invention expands the applicability of feathers in badminton shuttlecock production, improving feather utilization. Traditional badminton shuttlecock production requires strict control over the length of the feather shaft and the weight of the feathers, thus limiting the range of materials that can be used. For example, about 40% of duck feathers purchased are considered waste due to unsuitable length and weight, making them unusable for shuttlecock production. This patent application, by incorporating a core shaft, allows for the selection of core shafts of varying lengths to accommodate different feather shaft lengths. Only the feather blades inserted into the core shaft need to meet production requirements, thus expanding the range of feathers that can be used in shuttlecock production, avoiding feather waste, being more environmentally friendly, and improving economic efficiency. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the badminton shuttlecock of this utility model.

[0040] Figure 2 This is a schematic diagram of the structure of the feather blade of this utility model.

[0041] Figure 3 This is a three-dimensional structural diagram of the feather blade of this utility model.

[0042] Figure 4 This is a schematic diagram of the structure of the 14 feather blades of the badminton shuttlecock of this utility model.

[0043] Figure 5 This is a schematic diagram of the structure of Embodiment 4 of this utility model.

[0044] Figure 6 This is a comparative schematic diagram of Example 5.

[0045] Figure 7 This is a top view of the structure when the sleeve is inserted into the ball head.

[0046] Figure 8 This is a top view of the structure when the core rod is inserted into the ball head.

[0047] Figure 9 This is a schematic diagram of the back side of the badminton shuttlecock head according to this utility model. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this utility model more readily understood, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0049] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0050] Example 1

[0051] like Figure 1The badminton shuttlecock shown includes a head 1 and feather blades. The head 1 is a hemispherical structure with a flat surface at the top. The feather blades are arranged in a ring on the top of the head 1. The shuttlecock can have 12, 13, 14, 15, or 16 feather blades. When using larger and thicker feathers, even 8 or 10 feather blades can be used. A reinforcing coil 6 is wound around the feather blades, and the reinforcing coil 6 has 2 turns. Therefore, the overall structure is basically the same as that of a traditional badminton shuttlecock.

[0052] In this embodiment, the preferred length of the shaft 3 of the natural feather 2 is about 56mm, which allows both reinforcing coils 6 to be set on the shaft 3, further improving the overall strength of the shaft 3.

[0053] The feather blade described in this embodiment is composed of natural feathers 2 and core shafts 5. Natural feathers 2 include shafts 3 and wings 4. The length of natural feathers 2 is shorter than that of standard badminton shuttlecock feathers, so they need to be fixed to the shuttlecock head 1 by the core shafts 5.

[0054] Core rod 5 includes an insertion section and a connecting section, such as Figure 2 As shown in the diagram, X corresponds to the insertion section, which is 8mm long. The insertion section of the core rod 5 is inserted into the shaft 3 of the natural feather 2 and fixedly connected to the shaft 3 by adhesive. Y corresponds to the connecting section, which is inserted into the head 1 of the shuttlecock and also fixedly connected by adhesive. The core rod 5 is selected with a suitable length according to the length of the shaft, so that after the insertion section of the core rod 5 is inserted into the shaft and fixed, the overall length of the feather blade is basically the same as the length of the standard shuttlecock feather. The connecting section only needs to firmly fix the shaft 3 to the head 1. Depending on the length of the connecting section, it can be fully or partially inserted into the head 1. The mass-to-length ratio of the core rod 5 is 1.5g / m, and the preferred material for the core rod is carbon fiber.

[0055] like Figure 3 As shown, the core rod 5 is a flat strip, so its cross-sectional shape is nearly rectangular. The relatively wide sides of the rectangle are arranged along the circumference formed by the feather blades, meaning the wider side of the core rod 5 is aligned along the circumference of the top of the shuttlecock. This guides the feather shaft 3 to bend along the wider side, deforming together with the feather shaft 3, thus providing better guidance and protection. Of course, in similar designs, the acute angle between the core rod 5 and the circumferential direction can be less than 45 degrees, for example, 5 degrees. Setting an angle in the circumferential direction allows the shuttlecock to spin better during flight, resulting in better flight stability.

[0056] It should be noted that in the aforementioned badminton shuttlecock, to achieve better shock absorption and cushioning, the shaft 3 should not contact the head 1, or the length of the shaft 3 inserted into the head 1 should not exceed 5mm. In traditional badminton shuttlecocks, the shaft 3 is directly inserted into the head 1 for fixation. Therefore, when the head 1 is hit, the head 1, shaft 3, and core shaft are a single unit, sharing the impact force. However, in this patent application, the core shaft 5 is securely connected to the head 1. The core shaft 5 is preferably made of materials such as carbon fiber or titanium alloy, which possess both toughness and strength. The strength of these materials is significantly greater than that of the shaft 3 of natural feathers, thus making them more able to withstand impacts and less prone to breakage or cracking. Allowing the core shaft 5 to directly bear the impact force before transmitting it to the shaft 3 provides a degree of protection for the shaft 3.

[0057] Example 2

[0058] In this embodiment, as Figure 4 As shown, a badminton shuttlecock has 14 feather blades. This means that not all badminton shuttlecocks need to have 16 feather blades. When using feather blades with larger wings and thicker shafts, a smaller number can be used to balance the total weight of the shuttlecock and other related parameters, while still achieving a good feel for the shuttlecock.

[0059] Example 3

[0060] In this embodiment, the badminton shuttlecock is provided with 10 feather blades and 5 standard badminton shuttlecock feather pieces. One standard badminton shuttlecock feather piece is provided for every 2 feather blades in the circumferential direction. At this time, the feather blades and standard badminton shuttlecock feather pieces can be used interchangeably and are all inserted on the shuttlecock head 1 to form the badminton shuttlecock of this utility model.

[0061] Example 4

[0062] In this embodiment, as Figure 5 As shown, the connection relationship of each part of the badminton shuttlecock is the same as in Example 1, but the length of the shaft 3 is shorter, so the required length of the core shaft 5 is longer. The core shaft 5 also has an insertion section that inserts into the shaft 3, and the connecting section of the core shaft 5 is inserted into the shuttlecock head. Since the shaft 3 is too short to reach the shuttlecock head, the part of the connecting section of the core shaft 5 between the shaft 3 and the shuttlecock head 1 is exposed.

[0063] Since the length of the bob 3 is relatively short, the upper coil of the reinforcing coil 6 is set on the bob 3, and the lower coil is set on the core rod 5, that is, on the exposed connecting section of the core rod 5.

[0064] Example 5

[0065] This embodiment is for comparative illustration purposes; the cross-sectional area of ​​the core rod 5 is not greater than the maximum cross-sectional area of ​​the hair rod 3.

[0066] Since the core rod 5 is divided into two sections—an insertion section and a connecting section—the insertion section needs to be inserted into the core rod 3. Therefore, simply put, the cross-sectional area of ​​the insertion section of the core rod 5 must be significantly smaller than the cross-sectional area of ​​the core rod 3. This is to ensure that the sidewall structure of the core rod 3 is not damaged during insertion and connection. Furthermore, the cross-sectional area of ​​the connecting section of the core rod 5 is not greater than the maximum cross-sectional area of ​​the core rod 3. In other words, the connecting section of the core rod 5 is also thinner than the core rod. Figure 6 As shown in the figure, this embodiment demonstrates a structural comparison of the sleeve 8 and the core rod 5 in the prior art, both inserted into the ball head 1. The right side of the figure shows two core rods 5 with different insertion angles. When the insertion angle of the core rod 5 on the ball head is larger, i.e., in a more upright position as shown in the figure, the insertion angle of the core rod 5 determines that the feather blades are also more upright, and the spread of the feather blades in the circumferential direction is smaller (the maximum diameter of the circumference is smaller). At this time, the ball speed will be faster, for example, at speeds of 77 or 78. Conversely, when the insertion angle of the core rod 5 on the ball head is smaller, i.e., in a more tilted position as shown in the figure, the spread of the feather blades in the circumferential direction is larger (the maximum diameter of the circumference is larger). At this time, the ball speed will be slower. The larger the tilt angle of the core rod 5, the slower the ball speed, and the smaller the ball speed number. Since the sleeve 8 on the right needs to allow the feather shaft 3 to be inserted, the diameter of the sleeve 8 must be larger than that of the feather shaft 3, therefore the sleeve 8 is thicker.

[0067] Figure 7 The diagram shows a top view of the structure with the sleeve 8 inserted at the shuttlecock head 1. The feathers of the shuttlecock are arranged in a circle, so the sleeve 8 also needs to be arranged in a circle. Because the sleeve 8 has a relatively large diameter, the angle at which it is tilted vertically at the shuttlecock head cannot be too large, otherwise it will look like... Figure 7 As shown, the sleeves 8 are in contact with each other inside the ball head 1, which disrupts the integrity of the central part of the ball head 1, resulting in the ball head 1 being shattered and the sleeves 8 flying out and falling off when it is hit.

[0068] In contrast, when using core rod 5 for connection, Figure 8 The diagram shown is a top view of the structure of the core shaft 5 when it is in the head 1. The thinner core shaft 5 is less likely to come into contact with each other inside the head 1. Therefore, the tilt angle of the core shaft 5 can be greater. Thus, the technical solution of the core shaft 5 adopted in this patent application can achieve greater adjustability of the shuttlecock speed and manufacture a shuttlecock with a slower speed than that using the sleeve 8, which has a wider range of applications.

Claims

1. A badminton shuttlecock, comprising a shuttlecock head (1) and feather blades, the feather blades being arranged in a ring and inserted into the shuttlecock head (1), and a reinforcing coil (6) being wound around the feather blades, characterized in that: The feather blades include natural feathers (2) and core shafts (5). The core shaft (5) includes an insertion section and a connecting section. The natural feathers (2) include a shaft (3) and a wing (4). The insertion section of the core shaft (5) is inserted into the shaft (3) of the natural feathers (2) and fixedly connected to the shaft (3). The connecting section of the core shaft (5) is inserted into the ball head (1) and fixedly connected.

2. The badminton shuttlecock according to claim 1, characterized in that: It also includes standard badminton shuttlecock feathers, with the feather blades and standard badminton shuttlecock feathers respectively inserted on the shuttlecock head (1) to form a badminton shuttlecock.

3. The badminton shuttlecock according to claim 1 or 2, characterized in that: The reinforcing coil (6) is provided with at least one turn; when the reinforcing coil (6) is one turn, it is wound on the barb (3); when the reinforcing coil (6) is more than one turn, at least one turn of the reinforcing coil (6) is wound on the barb (3) of the natural feather (2).

4. The badminton shuttlecock according to claim 3, characterized in that: The aforementioned reinforcing coil (6) is provided in two parts.

5. The badminton shuttlecock according to claim 1 or 2, characterized in that: The described hair rod (3) does not directly contact the ball head (1), or the length of the hair rod (3) inserted into the ball head (1) is no more than 5mm.

6. The badminton shuttlecock according to claim 1 or 2, characterized in that: The natural feathers (2) are 40 mm to 68 mm in length.

7. The shuttlecock according to claim 1 or 2, characterized in that: The cross-sectional shape of the core rod (5) is non-circular.

8. The badminton shuttlecock according to claim 7, characterized in that: The core rod (5) has a relatively wide side in its cross-sectional shape. The core rod (5) is arranged along the circumferential direction formed by the arrangement of feather blades with the relatively wide side, or the acute angle between the core rod (5) and the circumferential direction is less than 45 degrees.

9. The badminton shuttlecock according to claim 8, characterized in that: The core rod (5) has a rectangular cross-sectional shape.

10. The shuttlecock according to claim 1 or 2, characterized in that: The core rod (5) is inserted into the hair rod (3) for a length of not less than 5 mm.

11. The shuttlecock according to claim 1 or 2, characterized in that: The mass-to-length ratio of the core rod (5) is not greater than 4 g / m.

12. The badminton shuttlecock according to claim 1 or 2, characterized in that: The core rod (5) is made of carbon fiber, titanium alloy, aluminum, aluminum alloy, plastic, wood or bamboo.

13. The shuttlecock according to claim 1 or 2, characterized in that: The cross-sectional area of ​​the core rod (5) is not greater than the maximum cross-sectional area of ​​the bob (3).

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