Spike pins, shoes equipped with spike pins, and method for manufacturing spike pins.

Abstract

The objective is to provide spike pins that offer excellent insertion and removal performance and ease of handling, shoes equipped with such spike pins, and a method for manufacturing spike pins. The present invention, which solves the above problems, is a spike pin X having a penetrating portion 1 that penetrates the ground, and the penetrating portion 1 has a region in which dimple portions 11 are provided at a depth greater than the virtual outer surface formed by connecting the outer edges of the penetrating portion 1, with 2 or more dimple portions per 4 square mm, and a shoe Y on which this spike pin X is provided.

Description

Technical Field

[0001] The present invention relates to a spike pin for track and field competitions and a shoe provided with the spike pin.

Background Art

[0002] A spike pin for track and field competitions is attached to the bottom surface of a shoe. This pin is used to enhance the grip performance between the foot and the ground, prevent slipping, and support acceleration and direction changes.

[0003] In spike pins, while improving the grip performance is important, it is also important to make it easy to pull out from the track. Under such problems, there are spikes with a devised shape, for example, the spikes described in Patent Document 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Compared with the currently mainstream tapered or stepped cylindrical spikes as of 2024, the spikes described in Patent Document 1 have low strength. In addition, there are problems such as difficulty in attachment and often not conforming to the regulations of competitions.

[0006] In view of the above problems, an object of the present invention is to provide a spike pin excellent in insertion and extraction performance and handling performance, a shoe provided with the spike pin, and a method for manufacturing the spike pin.

Means for Solving the Problems

[0007] The present invention, which solves the above problems, is a spike pin having a penetrating portion that penetrates the ground, and the penetrating portion has a region in which dimple portions are provided at a depth greater than the virtual outer surface formed by connecting the outer edges of the penetrating portion, with two or more dimple portions per 4 square mm. This configuration makes it possible to apply it to spike pins of various shapes, and the dimpled portion reduces the contact area with the ground surface, making it easier to insert and remove the spike pin.

[0008] Furthermore, the present invention relates to a shoe equipped with a spike pin having a penetrating portion that penetrates the ground, and the penetrating portion has a region in which dimples are provided at a rate of 2 or more per 4 square mm, which are recessed from the virtual outer surface formed by connecting the outer edges of the penetrating portion. This allows us to provide shoes that reduce resistance when inserting or removing them from the ground.

[0009] Furthermore, the present invention relates to a method for manufacturing a spike pin having a penetration portion that penetrates the ground, and includes a molding step of forming a pin, and a dimple forming step of forming a region on the molded pin in which dimple portions are provided in a recessed area, with two or more dimple portions per 4 square mm, which are recessed from a virtual surface formed by connecting the outer edges of the penetration portion. This makes it possible to manufacture spike pins that are easy to insert and remove from the ground and are easy to handle. [Effects of the Invention]

[0010] The present invention, which solves the above problems, can provide a spike pin that is excellent in terms of insertion and removal performance and ease of handling, a shoe equipped with the spike pin, and a method for manufacturing the spike pin. [Brief explanation of the drawing]

[0011] [Figure 1] These are a front view and a side view of a spike pin according to an embodiment of the present invention. [Figure 2]These are a bottom view and a schematic front view of a shoe with spike pins attached, according to an embodiment of the present invention. [Figure 3] This is a schematic cross-sectional view of a spike pin according to an embodiment of the present invention. [Figure 4] This image shows a schematic cross-sectional view of the spike pin surface according to an embodiment of the present invention, and a magnified photograph of a spike pin according to an embodiment of the present invention. [Figure 5] This is a magnified photograph of a spike pin according to an embodiment of the present invention. [Figure 6] This is a magnified photograph of a spike pin according to a comparative example of the present invention. [Figure 7] This figure shows the arithmetic mean roughness according to examples and comparative examples of the present invention. [Figure 8] This shows a schematic cross-sectional view of a spike pin and a schematic front view of a shoe to which the spike pin is attached, according to another embodiment of the present invention. [Modes for carrying out the invention]

[0012] The spike pins according to each embodiment of the present invention will be described below with reference to the drawings. The description will detail the configuration of the embodiment, the method of implementation, and the modifications thereto. The embodiments described below are merely examples of the present invention, and the present invention is not limited to these embodiments. Furthermore, the term "abbreviated" in the application documents is a concept that includes shapes that have been chamfered or rounded, and shapes in which the elements constituting the shape have been deformed or altered in length to the extent that it does not impede the purpose or effect of the configuration.

[0013] As shown in FIGS. 1 to 3, the present invention provides a spike pin X having a penetration portion 1 that penetrates the ground, and the penetration portion 1 has a dimple portion 11 provided recessed from a virtual outer peripheral surface formed by connecting the outer edges of the penetration portion 1, and has a region where 2 or more dimple portions 11 are provided per 4 square millimeters, and a shoe provided with the spike pin X. By providing the dimple portion 11 that is difficult to directly contact the ground in this way, it is presumed that the friction between the spike pin X and the ground can be reduced, and the insertion and removal can be easily performed smoothly. Here, FIG. 1 is a front view and a side view of the spike pin X. FIG. 2 is a schematic plan view and a schematic side view of the bottom surface of the shoe Y to which the spike pin X is attached. FIG. 3 represents a cross section taken along line A-A of FIG. 2 and is a schematic cross-sectional view of the shoe Y to which the spike pin X is attached.

[0014] The spike pin X is a hard member and has a penetration portion 1 that penetrates and pierces the ground (for example, tartan, which is the flooring of an athletic field) during use, and an attachment portion 2 for attaching to the shoe Y. As the hard member, metals such as steel and titanium, and hard resins are assumed.

[0015] The penetration portion 1 includes a penetration portion main body 10 that actually penetrates the ground. In the embodiment, the penetration portion main body 10 is provided in a tapered shape whose diameter decreases toward the tip as a whole, and reduces the friction applied when inserting and removing the spike pin. On the other hand, the penetration portion main body 10 may be provided in a stepped manner by combining a cylinder, a plurality of cylinder members having different diameters, or a tapered member, and according to this, the grip force with the ground can be increased.

[0016] The axial length of the penetration portion 1 is preferably shorter than 20 mm, more preferably 12 mm or less, and even more preferably 9 mm or less. Also, the axial length of the penetration portion 1 is preferably 1 mm or more, more preferably 2 mm or more, and even more preferably 3 mm or more. Thereby, it can be used in official competitions, enhancing the grip performance and facilitating attachment. In an embodiment, the axial length of the penetration part 1 is 5 mm. However, spike pins X with a preferable length may be appropriately selected according to the distance and the characteristics of the ground.

[0017] The penetration part main body 10 is provided with a notch 101 on the opposing side surfaces. The notch 101 is formed as a surface provided parallel to the axial direction of the penetration part 1. Thereby, the whole of the penetration part main body 10 becomes easy to penetrate into the ground, and the grip force can be enhanced. In particular, as shown in Fig. 2(a), by providing the direction of the surface of the notch 101 parallel to the axis of the shoe Y, it becomes easy to smoothly insert and remove the spike pin X with respect to the ground. In addition, by deliberately shifting and providing the direction of the axis of the shoe Y and the surface of the notch 101, the grip force in a predetermined direction can also be enhanced. Therefore, the grip force can be adjusted according to the preference of the user.

[0018] Here, as shown in Fig. 4(a), on the surface of the penetration part main body 10, a surface formed by connecting the outer edge of the penetration part main body 10 is defined as a virtual surface A. In the embodiment, the virtual surface A is in a tapered shape provided with the notch 101, and substantially coincides with the surface when the process of forming the dimple part 11 described later is not performed. And on the surface of the penetration part main body 10, there is a region where a plurality of dimple parts 11 provided recessed from the virtual surface A and outer edge protrusions 12 protruding around the dimple parts 11 are provided. Further, the whole surface of the penetration part 1 is covered with a coating part 13. The protruding height of the outer edge protrusion 12 is higher than the average height of the dimple part 11 and is below the height of the virtual surface A. The dimple part 11 and the outer edge protrusion 12 are provided to have sizes and depths that cannot be seen by the naked eye.

[0019] The attachment part 2 has a limiting part 21 that abuts against the shoe Y during attachment and limits penetration to a predetermined depth or more, and an attachment screw 22 that can be screwed into a hole provided in the shoe Y.

[0020] The limiting portion 21 is a plate material provided between the penetration portion body 10 and the mounting screw 22, and is provided such that its maximum length in the width direction is longer than at least the maximum diameter of the circumscribed circle of the penetration portion body 10 and the maximum diameter of the circumscribed circle of the mounting screw 22, thereby interfering with the bottom surface of the shoe Y. This keeps the protrusion height of the penetration portion body 10 from the shoe Y constant.

[0021] The mounting screw 22 is a male threaded member that protrudes from approximately the center of the limiting portion 21 and is provided so as to be attached to a female thread provided on the shoe Y. This makes it easy to remove the spike pin X and also makes it easy to change the mounting angle to the shoe Y.

[0022] The surface configuration of the penetration section body 10 will be described in detail below using Figures 4 to 6. Figure 4(a) is a schematic enlarged cross-sectional view of the vicinity of the surface of the penetration section body 10, and Figures 4(b) and 5 are scanning electron microscope images (hereinafter referred to as SEM images) of the surface of the penetration section 1. Figure 6 also shows an SEM image of a spike pin that has only undergone polishing treatment as a comparative example. The penetration section body 10 is provided with numerous dimple sections 11 and outer edge protrusions 12, and the dimple sections 11 have a region in which various shapes are arranged continuously. In this region, the outer edge protrusions 12 form a mesh-like pattern on the surface of the penetration section body 10, and the dimple sections 11 are provided so as to be surrounded between the outer edge protrusions 12.

[0023] As shown in Figure 4(a), the penetration portion body 10 has a coating portion 13 that covers the dimple portion 11 and the outer edge projection 12. The coating portion 13 is made of a material that has a lower static friction coefficient or dynamic friction coefficient than the surface of the penetration portion body 10 that does not have the coating portion 13. Preferably, this material is a carbon coating or a fluororesin coating. When using a carbon coating, DLC (Diamond-Like Carbon) is more preferably used. This makes the surface itself slippery, further reducing resistance when inserting and removing the spike pin X. Alternatively, the coating portion 13 may be plated. Various platings can be used, including nickel plating and chromium plating.

[0024] In the region where the dimple portion 11 is provided, the number of dimple portions 11 per 4 square mm is preferably 2 or more, more preferably 10 or more, even more preferably 30 or more, and most preferably 50 or more, as shown in Figure 4(b). By providing multiple dimple portions 11 in this way, even if the penetration portion 1 does not penetrate at a fixed angle, the contact points are dispersed, reducing friction between the spike pin X and the ground, and preventing stress from concentrating on a specific outer edge projection 12 and causing it to break.

[0025] The height from the virtual surface A to the lowest surface of the dimple portion 11 is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less. By providing such irregularities that are not visible to the naked eye, it is presumed that the friction generated by the irregularities of the dimple portion 11 itself is reduced, making it easier to insert and remove the spike pin X. Furthermore, the lower limit of this height is preferably 1 μm or more, more preferably 2 μm or more, and even more preferably 3 μm or more. It is presumed that having a certain level of irregularities makes it difficult for the dimple portion 11 to come into contact with the ground, reducing the contact area and making it easier to insert and remove the spike pin X.

[0026] The area of ​​each dimple portion 11 is preferably 1 square mm or less, more preferably 0.5 square mm or less, and even more preferably 0.1 square mm or less, as shown in Figures 4(b) and 5. The maximum width of the dimple portion 11 is preferably 1 mm or less, more preferably 0.6 mm or less, and even more preferably 0.3 mm or less. Furthermore, the area of ​​each dimple portion 11 is preferably 0.0001 square mm or more, more preferably 0.0002 square mm or more, and even more preferably 0.0004 square mm or more, as shown in Figure 5(b). The maximum width is preferably 0.010 mm or more, more preferably 0.015 mm or more, and even more preferably 0.020 mm or more. Thus, by making the size of the dimple portion 11 smaller than the unevenness of the ground expected in track and field, it is presumed that contact between the ground and the dimple portion 11 will be prevented, which would increase the contact resistance of the spike pin X. Furthermore, it is estimated that by setting the maximum diameter of the dimple portion 11 to be larger on average than the height of the dimple portion 11, friction caused by the dimple portion 11 itself catching on the ground can be reduced.

[0027] The area where the dimple portion 11 is provided preferably occupies 25% or more of the entire penetration portion 1, more preferably 50% or more, and even more preferably the entire area of ​​the penetration portion 1. The dimple portion 11 may also be provided throughout the entire area, including the mounting portion 2 of the spike pin X. This reduces the contact area with the ground over a large portion of the penetration section 1, and even when the penetration angle of the penetration section 1 is varied, the contact points are dispersed, reducing friction and allowing for smooth insertion and removal of the spike pin X. Furthermore, if the dimple section 11 is also provided on the mounting section 2, it reduces friction during mounting, making it easier to attach the shoe Y.

[0028] As shown in Figure 7, the upper limit of the arithmetic mean roughness of the penetration portion body 10 in the generatrix direction is preferably 10 μm or less, more preferably 5.0 μm or less, and even more preferably 2.0 μm or less. This reduces friction during insertion and removal, allowing for smoother insertion and removal of the spike pins X.

[0029] The arithmetic mean roughness of the penetration portion body 10 in the generatrix direction is preferably 0.2 μm or more, more preferably 0.3 μm or more, and even more preferably 0.4 μm or more. The presence of the dimple portion 11 and the outer edge projection 12 results in a higher arithmetic mean roughness than a pin that has simply undergone a polishing process, as shown in Figure 7(b). The dimple portion 11 has moderate irregularities that reduce the contact area, thereby reducing friction when inserting or removing the spike pin X.

[0030] As shown in Figures 4(b) and 5, the surface of the outer edge projection 12 is designed to have greater irregularities compared to the surface of the dimple portion 11. In other words, the arithmetic mean roughness of the outer edge projection 12 is designed to be greater than the arithmetic mean roughness of the dimple portion 11. This creates areas within the outer edge projection 12 that are more or less likely to come into contact with the ground, and it is presumed that the reduced contact area with the ground makes it easier to insert and remove the spike pin X.

[0031] The following describes how the manufacturer produces the Spike Pin X. Note that the manufacturing method is not limited to the method described below, and the order of steps may vary. First, the manufacturer casts a pin comprising a penetration portion 1 and a mounting portion 2 by pouring material into a mold as part of the molding process. In this embodiment, the material is steel. The molding process may also be carried out by other methods such as cutting.

[0032] Next, the manufacturer performs a surface treatment process, smoothing the surface of the molded pin by polishing it. Subsequently, the manufacturer performs a dimple formation process, blasting the pin with predetermined particles to form a region in which two or more dimples 11 and outer edge protrusions 12 are provided.

[0033] Finally, the manufacturer applies a coating to the surface with a smooth material as part of the film formation process. Possible coating materials include carbon (especially DLC (Diamond-Like Carbon)) or fluororesin.

[0034] Furthermore, if a plating process is performed as part of the film formation process, the surface treatment process may be performed after the film formation process. This prevents metal from being deposited inside the dimple portion 11 and allows for the proper formation of dimples on the surface of the penetration portion 1. Nickel plating and chromium plating are examples of possible plating methods.

[0035] Herein, regarding the method for manufacturing the spike pin X of the present invention, preferred embodiments can be found by referring to the above description.

[0036] Furthermore, the dimple portion 11 may be formed not only on the penetration portion 1, but on the entire spike pin X.

[0037] Furthermore, even though the surface of the penetration portion 1 is provided with dimples 11, the arithmetic mean roughness is less than 10 μm, which allows the spike pin X to be inserted into and removed from the ground smoothly.

[0038] Furthermore, the dimple portion 11 is provided surrounded by outer edge projections 12 whose outer edges are higher than the average height of the dimple portion 11, and the outer edge projections 12 are provided so that the area of ​​the dimple portion 11 is 1 square mm or less, and / or so that the maximum width of the dimple portion is 1 mm or less. This narrows the spacing of the outer edge projections 12, making it less likely for the dimple portion 11 to come into contact with the ground, reducing the contact area between the penetration portion 1 and the ground, and making insertion and removal easier. Note that if there are two or more dimple portions 11 that satisfy the above conditions on the penetration portion 1, the ease of insertion and removal can be achieved.

[0039] Furthermore, the dimple portion 11 is surrounded by outer edge projections 12 whose outer edges are higher than the average height of the dimple portion 11, and the arithmetic mean roughness of the outer edge projections 12 is greater than the arithmetic mean roughness of the dimple portion 11. This provides the outer edge projections 12, which are more likely to come into contact with the ground, with parts that are more likely to come into contact and parts that are less likely to come into contact. The parts that are less likely to come into contact further reduce the contact area with the ground, thereby reducing the friction generated between the spike pin X and the ground.

[0040] Furthermore, the penetration portion 1 is provided with notches 101 on its side surface that form opposing parallel surfaces, allowing for the creation of stepped shapes to enhance and adjust the grip strength of the spike pins X.

[0041] Furthermore, the penetration portion 1 has a coating portion 13 on its surface, which enhances the durability of the dimple portion 11 and the outer edge protrusion 12. In particular, by using a material for the coating portion 13 that is more slippery than the surface of the penetration portion body 10, the sliding performance when inserting and removing the spike pin X can be further improved.

[0042] Furthermore, by making the dimple portion non-circular, multiple dimple portions 11 can be provided adjacent to each other regardless of the shape of the penetration portion 1. Also, in order to reduce manufacturing costs, the dimple portion may be non-circular, and the dimple portion 11 may be formed on the entire surface of the spike pin X.

[0043] Furthermore, regarding the manufacturing method of the spike pin X, by including a molding step for shaping the pin and a dimple forming step for shaping the molded pin, the dimple portion 11 can be appropriately formed by creating a region on the molded pin in which dimple portions 11, which are recessed from the virtual surface A formed by connecting the outer edges of the penetration portion 1, are provided in a region where there are 2 or more dimple portions per 4 square mm. Furthermore, by including a film forming step thereafter for forming a coating portion 13 on the surface of the penetration portion 1, the coating portion 13 can be appropriately formed. Test Example

[0044] The effects of the present invention will be explained below using test examples with the embodiment of the present invention and comparative samples. However, the present invention is not limited to the following embodiments.

[0045] The actual product was obtained by forming, polishing, and dimple formation processes on a steel material, followed by a nickel plating process to form a film. As shown in Figure 5, which is an SEM image of the penetration portion 1, the surface of the actual product has areas where dimple portions 11, which are recessed from the virtual surface A, are provided at a rate of 2 or more per 4 square mm. Furthermore, focusing on individual dimple portions 11, some have an area of ​​1 square mm or less, and some have a maximum width of 1 mm or less. In addition, the surface of the outer edge protrusions 12 surrounding the dimple portions 11 is rougher and has a larger arithmetic mean roughness compared to the dimple portions 11.

[0046] For the samples tested, arithmetic surface roughness was measured using a confocal laser microscope (VK-X150, manufactured by Keyence) as follows. First, the area of ​​penetration portion 1 of each sample was extracted. This area was roughly rectangular in shape, with a length of 1912.8 μm in the generatrix direction and a length of 520.6 μm in the width direction perpendicular to the generatrix direction. In this area, the height of the peaks and valleys on the surface was measured along a straight line in the generatrix direction, from the mounting portion 2 side toward the tip of penetration portion 1, and the arithmetic mean roughness was calculated based on the measurement results. As a result, the arithmetic mean roughness of penetration portion 1 was 10 μm or less.

[0047] The comparative sample was obtained by forming and polishing a steel material, but without performing a dimple formation process, and instead performing a nickel plating film formation process. As shown in Figure 6, which is an SEM image of penetration 1, its surface is smooth. Furthermore, the arithmetic mean roughness of penetration 1 of the comparative sample was calculated in the same manner as described above and was found to be 10 μm or less.

[0048] ≪Regarding the products being offered≫ Details of the specimens of the present invention used in the test are shown below. The specimens were obtained by forming, polishing, and dimple forming processes on a steel material, followed by a nickel plating process. In the test, a large number of specimens manufactured using the same manufacturing method as described above were used. From these specimens, the arithmetic mean roughness was measured for randomly sampled specimens ns1, ns2, and ns3, and the surface shape of ns2 was observed.

[0049] For measuring arithmetic surface roughness, three roughly rectangular areas were randomly selected from the penetration section 1 of each sample. In these areas, the height of the peaks and valleys was measured along a straight line in the direction of the generatrix, from the mounting section 2 to the tip of the penetration section 1. Based on the measurement results, the arithmetic mean roughness was calculated. This measurement was performed four times in each area.

[0050] The measurement results for arithmetic surface roughness are shown in Figure 7(a). In Figure 7(a), the bar graph for each sample represents the average of 12 data points, and the whiskers represent the maximum and minimum values. As shown in Figure 7(a), the arithmetic mean roughness of the samples fell within the range of 0.4 μm to 1.6 μm.

[0051] Observation of ns2 using a scanning electron microscope revealed, as shown in Figures 4 and 5, that inside the reticular structure formed by the outer edge protrusions 12, there are dimple portions 11 of 0.0004 square mm or more and 1 square mm or less, and dimple portions 11 of 0.1 square mm or less, and that in the penetration portion 1, there is a region containing at least 30 or more dimple portions 11 per 4 square mm. Furthermore, regarding the maximum width of the dimple portions 11, it was confirmed that there are multiple dimple portions 11 of 0.02 mm or more and 1 mm or less, and dimple portions 11 of 0.0004 square mm or more and 0.3 square mm or less.

[0052] ≪Regarding the comparison product≫ Details of the comparative samples used in the test are shown below. The comparative samples had the same shape as the test product, and after forming and polishing processes on the steel material, a nickel plating process was performed without the dimple formation process. In the test, a large number of comparative samples manufactured using the same manufacturing method were used, and the arithmetic mean roughness was measured for n1, n2, and n3, which were randomly sampled from these comparative samples, and the surface shape of n1 was observed.

[0053] The arithmetic mean roughness was calculated in the same manner as for the actual samples. The results are shown in Figure 6(b). In Figure 6(b), the bar graph for each comparison product represents the average of 12 data points, and the whiskers represent the maximum and minimum values. As shown in Figure 6(b), the arithmetic mean roughness of the comparison products fell within the range of 0.2 μm to 1.2 μm.

[0054] Observation of n1 using a scanning electron microscope revealed fine scratches and dirt on a smooth surface, as shown in Figure 5. On the other hand, the dimple portion 11 and the reticular outer edge protrusions 12 were not observed.

[0055] ≪First Exam≫ As the first test, a comparative test was conducted in which three testers performed their usual training using shoes equipped with the comparison product and the same shoes equipped with the test product, and compared their performance. All three testers had experience in track and field; Tester 1 had experience competing in the Japanese National Championships, Tester 2 had experience competing in the University Championships, and Tester 3 had experience competing in regional competitions. The performance comparison was conducted by having participants rate the feel of using the actual product on a 10-point scale, with the comparison product being assigned a score of 5, during acceleration, maximum speed, and deceleration.

[0056] The results of this test are shown in Table 1. According to Table 1, the product received a higher evaluation than the comparison product in all phases. In particular, it received a higher evaluation in the acceleration phase than in the maximum speed phase and the deceleration phase. It is presumed that the dimpled section 11 reduced friction and made it easier for the pins to come out, making it easier to increase the pitch and allowing for advantageous acceleration. The relatively low evaluation in the deceleration phase is presumed to be due to a slight decrease in braking performance due to the reduction in friction, but it is thought that the grip performance was maintained by the penetration section 1, resulting in a higher evaluation than the comparison product.

[0057] [Table 1]

[0058] ≪Second Exam≫ As a second test, monitors who purchased the product were asked to complete a questionnaire comparing the product with their own regular product (not the product being tested) (65 responses). All monitors were experienced in track and field. The questionnaire included the following questions: Question 1 asked whether there was a difference from a regular needle pin ("yes," "no," or "don't know"); Question 2 asked how it felt to run (on a 5-point scale: "very good," "good," "average," "bad," or "very bad"); Question 3 asked how it reduced strain on the legs (on a 5-point scale: "very good," "good," "average," "bad," or "very bad"); Question 4 asked monitors to select all the differences that applied to the product from a list of items; and Question 5 asked monitors to write their impressions of the product in a free-response format. The items in Question 4 included "reduced strain on the feet," "reduced resistance when inserting and removing," "easier to slide," "lighter running," "heavier running," and "felt like there were no pins."

[0059] The results of the responses to Question 1 were: "Yes" (64 responses), "No" (0 responses), and "Don't know" (1 response). Therefore, it can be inferred that the product being tested is different from the standard product.

[0060] The results of the responses to Question 2 were: "Very Good" 47 times, "Good" 17 times, "Average" 1 time, and "Bad" and "Very Bad" 0 times. Therefore, it can be inferred that the test product felt better to run than the standard product.

[0061] The results of the responses to Question 3 were: "Very good" 18 times, "Good" 35 times, "Average" 11 times, and "Bad" and "Very bad" 0 times. There was also one response of "Don't know". Therefore, it can be inferred that the improvement in insertion and removal due to the dimple section will generally reduce the burden on the legs.

[0062] The results of the responses to Question 4 were as follows: 18 people said "the strain on my feet was reduced," 49 people said "the resistance when inserting and removing the shoes was reduced," 3 people said "it became easier to slip," 26 people said "running felt lighter," and 23 people said "it felt like there were no pins." No monitors responded that "running felt heavier." Therefore, the implemented product can reduce resistance when inserting and removing the pins due to the dimple portion 11 provided at a predetermined size, making running easier. Furthermore, it is thought that this reduces the burden on the feet and helps maintain a certain level of grip performance.

[0063] In Question 5, for example, we received feedback such as: "I've only used it in practice so far, but I feel that the resistance of the pins when running is reduced, and I feel that it's easier to increase my pitch. I want to continue using it in the future," "Because the surface is smooth and it's 5mm, I had the impression that there was no pin feeling when making contact with the ground, and it was easier to increase my pitch. This led to a reduction in ground contact time," "Thanks to the NS Needle Pins (the product used), the feeling of inserting and removing the pins has decreased, and I feel closer to making contact with the ground with a wider surface area, making running more enjoyable!", and "I feel that the resistance of inserting and removing the pins is low. I haven't had it for long, so I want to continue to check it."

[0064] <<Other Embodiments>> The following describes spike pins according to other embodiments of the present invention. Note that components similar to those in the previously described embodiments are denoted by the same reference numerals and their descriptions are omitted. The embodiments described below are merely examples of the present invention, and the present invention is not limited to these embodiments. Furthermore, the term "abbreviated" in the application documents is a concept that includes shapes that have been chamfered or rounded, and shapes in which the elements constituting the shape have been deformed or altered in length to the extent that it does not impede the purpose or effect of the configuration.

[0065] As shown in Figure 8a, the spike pin X according to this embodiment is integrally formed with the shoe Y. In other words, the spike pin X is integrally molded to the sole of the shoe Y in a way that prevents it from being detached, and has a continuous structure without any dividing lines. In this configuration, there is no attachment part 2, which prevents the spike pin X from unintentionally falling off while the shoe Y is in use. [Explanation of Symbols]

[0066] X Spike Pin Y Shoes A virtual surface 1. Penetration 10 Penetration section main body 101 Notch 11 Dimple section 12 Outer marginal processes 13 Coating part 2 Mounting part 21 Restriction section 22 Mounting screws

Claims

1. It has a penetrating section that penetrates the ground, The aforementioned penetration portion has a region in which dimples, which are recessed from the virtual surface formed by connecting the outer edges of the penetration portion, are provided at a rate of 2 or more per 4 square mm. The surface of the aforementioned penetration portion is a spike pin with an arithmetic mean roughness less than 10 μm.

2. The penetration portion is provided with an outer edge projection that protrudes around the dimple portion, The spike pin according to claim 1, wherein the area of ​​the dimple portion is 1 square mm or less.

3. The penetration portion is provided with an outer edge projection that protrudes around the dimple portion, The spike pin according to claim 1, wherein the maximum width of the dimple portion is 1 mm or less.

4. The penetration portion is provided with an outer edge projection that protrudes around the dimple portion, The spike pin according to claim 1, wherein the arithmetic mean roughness of the outer edge projection is greater than the arithmetic mean roughness of the dimple portion.

5. The spike pin according to claim 1, wherein the penetration portion is provided with a notch on its side surface that forms opposing parallel surfaces.

6. The aforementioned penetration portion is a spike pin according to any one of claims 1 to 5, wherein a coating portion is provided on its surface.

7. It has a penetrating section that penetrates the ground, The aforementioned penetration portion has a spike pin having a region in which dimples are provided at a depth greater than the virtual surface formed by connecting the outer edges of the penetration portion, with two or more dimples per 4 square mm. The surface of the aforementioned penetration portion has an arithmetic mean roughness less than 10 μm.

8. The shoe according to claim 7, wherein the spike pins are provided integrally with the sole.

9. A method for manufacturing a spike pin having a penetration portion that penetrates the ground, The molding process for forming the pins, A method for manufacturing a spike pin, comprising: a dimple forming step, wherein the molded pin is provided with at least two dimple portions per 4 square mm, which are recessed from the virtual surface formed by connecting the outer edges of the penetration portion, and the surface of the penetration portion forms an area with an arithmetic mean roughness of less than 10 μm.

10. A method for manufacturing a spike pin according to claim 9, comprising a film-forming step of forming a coating on the surface of the penetration portion.

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