A support plate for shoes having a local reinforcement

Abstract

The present application relates to a kind of shoe materials, especially a kind of supporting plate with local reinforcement structure for shoes, including laminated board, the laminated board includes a plurality of sequentially stacked fiber layers, the upper surface or lower surface of the laminated board is divided into first area and second area, the first area is located in the position corresponding to the inner half side of human foot palm, the second area is located in the position corresponding to the outer half side of human foot heel, the first area and the second area are attached with first carbon fiber prepreg.The present application forms local reinforcement structure by attaching carbon fiber prepreg in the specific area of laminated board, can reduce the deviation angle of plantar pressure when initial landing period and stretch of sports shoes, improve the force line state of runner in the process of running, improve the smoothness of force transmission, and the running efficiency is relatively high.

Description

Technical Field

[0001] This invention relates to a shoe material, and more particularly to a shoe support plate with a locally reinforced structure. Background Technology

[0002] Carbon fiber laminates (also known as carbon plates) are increasingly used in athletic shoes, especially in marathon running shoes and professional competitive basketball shoes. Applying carbon fiber laminates to athletic shoes can effectively improve their support performance, provide better energy return, and thus enhance various athletic performance metrics.

[0003] The mechanical properties of carbon fiber plates in footwear exhibit anisotropic characteristics, which are closely related to their layup method. Different layup methods lead to different mechanical performance. Currently, shoes using carbon fiber plates typically employ the same layup method for both left and right shoes, generally using a symmetrical layup, meaning the composite material layers are symmetrically distributed on both sides of the central plane. This layup method helps ensure balanced mechanical properties of the composite material in all directions, but it can easily cause lateral displacement interference for runners during running, resulting in less smooth force transmission and affecting running efficiency.

[0004] In view of this, the inventor has conducted in-depth research on the above-mentioned problems, which led to the present invention. Summary of the Invention

[0005] The purpose of this invention is to provide a shoe support plate with a locally reinforced structure that has relatively high running efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A shoe support plate with a locally reinforced structure includes a laminated plate comprising a plurality of sequentially stacked fiber layers. The upper or lower surface of the laminated plate is divided into a first region and a second region. The first region is located at a position corresponding to the inner half of the forefoot of a human foot, and the second region is located at a position corresponding to the outer half of the heel of a human foot. Both the first region and the second region are attached with a first carbon fiber prepreg.

[0008] As an improvement of the present invention, the upper or lower surface of the laminate is further divided into a third region, the third region being located at a position corresponding to the inner half of the heel of the human foot, and a second carbon fiber prepreg is attached to the third region, the tensile strength and tensile modulus of the second carbon fiber prepreg being less than those of the first carbon fiber prepreg.

[0009] As an improvement of the present invention, both the second region and the third region extend to a position corresponding to the arch of the human foot.

[0010] As an improvement of the present invention, a side support portion is formed on the inner side of the laminate, and the first carbon fiber prepreg is adhered to one side of the side support portion.

[0011] As an improvement of the present invention, the side support extends from a position corresponding to the arch of the human foot to a position corresponding to the heel of the human foot.

[0012] As an improvement of the present invention, the front part of the laminate is provided with a bifurcated groove, the second region is located on one side of the bifurcated groove, and the laminate is provided with a strip-shaped hole at a position on the side of the bifurcated groove away from the second region.

[0013] As an improvement of the present invention, there are two laminates, namely a left laminate for the left shoe and a right laminate for the right shoe. The number of fiber layers in the left laminate is the same as that in the right laminate. The material of some fiber layers in the left laminate is different from that in the right laminate, and / or the laying angle of each fiber layer in the left laminate is different from that of the corresponding layer in the right laminate.

[0014] As an improvement of the present invention, each of the fiber layers in the same plywood is divided into three layers from top to bottom: an upper layer group, a middle layer group, and a lower layer group. The upper layer group includes an even number of fiber layers, the middle layer group includes at least one fiber layer, and the fiber layer is a carbon fiber layer. The lower layer group includes an even number of fiber layers.

[0015] In the left composite plate, each fiber layer in the upper layer group is a carbon fiber layer and a basalt fiber layer arranged alternately from top to bottom, and each fiber layer in the lower layer group is a carbon fiber layer and a basalt fiber layer arranged alternately from top to bottom.

[0016] In the right-side laminate, each fiber layer in the upper layer group consists of alternating basalt fiber layers and carbon fiber layers arranged from top to bottom, and each fiber layer in the lower layer group consists of alternating basalt fiber layers and carbon fiber layers arranged from top to bottom.

[0017] As an improvement of the present invention, the carbon fiber layer in the middle layer group is made of a third carbon fiber prepreg, and the carbon fiber layers in the upper layer group and the lower layer group are made of the first carbon fiber prepreg. The tensile strength and tensile modulus of the third carbon fiber prepreg are both less than those of the second carbon fiber prepreg.

[0018] A shoe support plate with a locally reinforced structure includes two laminated plates: a left laminated plate for the left shoe and a right laminated plate for the right shoe. Both the left and right laminated plates comprise multiple sequentially stacked carbon fiber layers, and the number of fiber layers in the left laminated plate is the same as that in the right laminated plate. The layup angle values ​​of each fiber layer in the left laminated plate are opposite to the layup angle values ​​of the corresponding layers in the right laminated plate.

[0019] By adopting the above technical solution, the present invention has the following beneficial effects:

[0020] 1. This invention forms a localized reinforcing structure by attaching carbon fiber prepreg to specific areas of the laminate, which can reduce the offset angle of the foot pressure during the initial landing phase and the push-off phase of the athletic shoe, improve the runner's force line state during running, enhance the smoothness of force transmission, and result in relatively high running efficiency.

[0021] 2. The support plate provided by the present invention uses different materials and / or different laying angles for the fiber layers of the laminated plate for the left shoe and the laminated plate for the right shoe, so as to realize heterogeneous fiber combination layup and / or asymmetrical angle layup, which helps to further reduce the left and right offset interference that occurs during the runner's running process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the laminate structure in the embodiment.

[0023] The corresponding labels in the image are as follows:

[0024] 11 - First area; 12 - Second area;

[0025] 13-Third zone; 14-Side support section;

[0026] 15-Forked groove; 16-Strip hole. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the terms "first," "second," etc., used in the present invention are used to distinguish different objects, rather than to describe a specific order.

[0028] For ease of explanation, in this invention, the side facing each other when the two shoes of the same pair of shoes are in normal use is the inner side of each component, and the corresponding other side is the outer side of the component. The side of the shoe facing the ground when in normal use is the lower side, and the corresponding other side is the upper side. The direction of the left hand of the body after the shoe is worn is the left side, and the direction of the right hand is the right side.

[0029] This invention provides a shoe support plate, comprising two laminated plates: a left laminated plate for the left shoe and a right laminated plate for the right shoe. Specifically, the shoe support plate provided in this embodiment includes a left laminated plate for the left shoe and a right laminated plate for the right shoe. Each laminated plate (i.e., the left and right laminated plates) comprises multiple sequentially stacked fiber layers, all of which have the same outline shape and dimensions. Figure 1 As shown, the upper or lower surface of the laminate is divided into a first region 11 and a second region 12. In this embodiment, the description is based on the example of each region being located on the lower surface of the laminate. The first region 11 is located at a position corresponding to the inner half of the forefoot, and the second region 12 is located at a position corresponding to the outer half of the heel. The inner half of the forefoot refers to the part relatively close to the inside of the foot after dividing the forefoot into two equal parts; the outer half of the heel refers to the part relatively close to the outside of the foot after dividing the arch of the foot into two equal parts; similarly, the inner half of the heel refers to the part relatively close to the inside of the foot after dividing the arch of the foot into two equal parts.

[0030] Both the first region 11 and the second region 12 are coated with a first carbon fiber prepreg to form a localized reinforcement structure. This localized reinforcement structure can reduce the offset angle of the plantar pressure during the initial landing phase and the push-off phase of the athletic shoe, improve the runner's force line state during running, enhance the smoothness of force transmission, and thus improve running efficiency. Of course, the localized reinforcement structure can also be omitted, and only the heterogeneous fiber combination layup structure and / or asymmetric angle layup structure mentioned below can be used. In other words, the present invention essentially also provides a shoe support plate with a localized reinforcement structure and a shoe support plate without a localized reinforcement structure.

[0031] Preferably, the upper or lower surface of the laminate is further divided into a third region 13. In this embodiment, the third region 13 is located on the lower surface of the laminate as an example. The third region 13 is located at a position corresponding to the inner half of the human heel, and a second carbon fiber prepreg is attached to the third region 13 to form part of a local reinforcement structure. The tensile strength and tensile modulus of the second carbon fiber prepreg are both lower than those of the first carbon fiber prepreg to avoid displacement interference. In this embodiment, the carbon fiber grade used for the first carbon fiber prepreg is SYT70, and the carbon fiber grade used for the second carbon fiber prepreg is SYT49S. In addition, both the second region 12 and the third region 13 extend to a position corresponding to the arch of the human foot to improve stability.

[0032] Preferably, the inner side of the laminate has an upwardly curved side support portion 14, and a first carbon fiber prepreg is adhered to one side of the side support portion 14 to form another local reinforcement structure, further preventing displacement interference. The side support portion 14 extends from a position corresponding to the arch of the human foot to a position corresponding to the heel of the human foot.

[0033] Preferably, the front part of the laminate has a bifurcated groove 15 extending along the length direction of the laminate, the bifurcated groove 15 divides the front part of the laminate into two parts, left and right, the second region 12 is located on one side of the bifurcated groove, and the laminate has a strip hole 16 at the position of the side of the bifurcated groove 15 away from the second region.

[0034] The left plywood has the same number of fiber layers as the right plywood to ensure balance between the left and right feet. Some fiber layers in the left plywood are made of different materials than those in the right plywood, forming a heterogeneous fiber layup structure, and / or the layup angles of the fiber layers in the left plywood differ from the corresponding layup angles in the right plywood, forming an asymmetrical angle layup structure. In other words, the shoe support plate provided in this embodiment can be configured with only one of the following structures: a local reinforcement structure, a heterogeneous fiber layup structure, or an asymmetrical angle layup structure; it can also be configured with two of these structures; or it can be configured with all three structures simultaneously.

[0035] It should be noted that the laying angle of each fiber layer refers to the angle between the fiber extension direction of the corresponding fiber layer and the reference direction, with the clockwise direction as positive. The reference direction is the direction preset during production and can be any direction. In this invention, the reference direction is the length direction of the laminate.

[0036] In this embodiment, the heterogeneous fiber layup structure specifically involves dividing the fiber layers in the same laminate into three groups from top to bottom: an upper group, a middle group, and a lower group. The upper group comprises an even number of fiber layers; the middle group comprises at least one fiber layer, which is a carbon fiber layer; and the lower group comprises an even number of the aforementioned fiber layers. The specific number of fiber layers in each group can be determined according to actual needs. Preferably, the middle layer comprises two carbon fiber layers, one with a layup angle of 0° and the other with a layup angle of 90°. The layup angles of the fiber layers in the upper and lower groups can be determined according to actual needs. For example, the layup angles of the fiber layers in the left laminate can be the same as, or different from, the layup angles of the corresponding fiber layers in the right laminate. Furthermore, in the same laminate, the number of fiber layers in the upper group is preferably twice the number of fiber layers in the lower group.

[0037] In the left-side composite slab, the upper layer consists of alternating layers of carbon fiber and basalt fiber arranged from top to bottom, and the lower layer consists of alternating layers of carbon fiber and basalt fiber arranged from top to bottom. In the right-side composite slab, the upper layer consists of alternating layers of basalt fiber and carbon fiber arranged from top to bottom, and the lower layer consists of alternating layers of basalt fiber and carbon fiber arranged from top to bottom. That is to say, although carbon fiber and basalt fiber layers are alternately arranged in both the upper and lower layers of the left-side composite slab, the fiber materials of each layer are different because the fiber material of the starting layer (first layer) is different.

[0038] Preferably, the carbon fiber layer in the middle layer is made of a third carbon fiber prepreg, and the carbon fiber layers in the upper and lower layers are made of a first carbon fiber prepreg. The tensile strength and tensile modulus of the third carbon fiber prepreg are both less than those of the second carbon fiber prepreg. In this embodiment, the carbon fiber grade used in the third carbon fiber prepreg is SYT49S.

[0039] In this embodiment, the asymmetric angle layup structure is specifically defined as follows: the layup angle values ​​of each fiber layer in the left plywood are opposite to the layup angle values ​​of the corresponding layers in the right plywood.

[0040] Preferably, adjacent fiber layers are bonded together with resin adhesive.

[0041] To provide a more intuitive understanding of the technical solution and effects of the present invention through comparison, the present invention also provides a comparative example and five embodiments. Each comparative example and embodiment's shoe support plate includes two laminated plates: a left laminated plate for the left shoe and a right laminated plate for the right shoe. Each laminated plate includes eight sequentially stacked fiber layers. However, each fiber layer is made of commercially available fiber prepreg, and the resin content of each fiber layer is 35%, with resin grade WP-S5001. The manufacturing method of each laminated plate is as follows:

[0042] S1. Lay-up: Fiber prepreg is used to lay up the composite material according to the number of layers, angle and material requirements of the desired laminate. The specific lay-up process is the same as the conventional laminate lay-up process and is not the focus of this embodiment, so it will not be described in detail here.

[0043] S2. Cutting: The composite material obtained in step S1 is cut according to the cavity shape of the hot pressing mold to obtain cut parts. The specific shape can be determined according to actual needs. For example, it can be set as the shape of a carbon plate for shoes or the shape of a shoe insole. In each comparative example and embodiment, the cut parts used to form the left layer are the same in shape, and the cut parts used to form the right layer are also the same in shape.

[0044] S3. Molding: The cut parts are placed in a hot press mold and subjected to hot pressing, heat preservation, and cooling curing in sequence. If necessary, grinding, cleaning, sandblasting, and / or painting can be performed after cooling curing to obtain the laminate. The above processes are all conventional and will not be described in detail here. The curing temperature is 110-220℃, the pressure is 1-3MPa, and the molding time is 5-30min.

[0045] The differences between the various comparative examples and embodiments are explained below.

[0046] Comparative Example 1: Both the left and right plywoods use a traditional symmetrical plywood structure.

[0047] The two laminates of the shoe support plate provided in the comparative example have the same structural layup structure and layup method. Each fiber layer is a carbon fiber layer, and the fiber grade used for the carbon fiber layer (i.e. the fiber in the carbon fiber prepreg) is SYT45S. The layup angles of each fiber layer from bottom to top are 25°, -25°, 25°, -25°, 90°, 0, 25° and -25°.

[0048] Example 1: Using heterogeneous fiber layup structure.

[0049] The two laminates of the shoe support plate provided in Example 1 have the same laying angle, but different ply materials. Specifically, the number of layers (arranged in order from top to bottom), laying angle and ply material of the left laminate are shown in the table below.

[0050]

[0051] The number of right-side plywood layers (in descending order), laying angle, and ply materials are shown in the table below.

[0052]

[0053] Example 2: Asymmetric angle layup structure is adopted.

[0054] In Example 2, the two laminates of the shoe support plate are all carbon fiber layers with the fiber grade SYT45S. However, the laying angles of the fiber layers of the two laminates are different. Specifically, the number of layers (arranged in order from top to bottom), laying angle and laying material of the left laminate are shown in the table below.

[0055]

[0056] The number of right-side plywood layers (in descending order), laying angle, and ply materials are shown in the table below.

[0057]

[0058] Example 3: A locally reinforced structure is adopted.

[0059] refer to Figure 1 As shown, the shoe support plate provided in Embodiment 3 adds a local reinforcement structure to the comparative example 1. That is, a first region 11, a second region 12 and a third region 13 are provided on the lower surface of each plywood. The first region 11 and the second region 12 are both attached with a first carbon fiber prepreg, the third region 13 is attached with a second carbon fiber prepreg, and the first carbon fiber prepreg is adhered to one side of the side support portion 14.

[0060] Example 4: Simultaneous use of asymmetric angle ply structure and local reinforcement structure.

[0061] refer to Figure 1 As shown, the shoe support plate provided in Embodiment 4 adds a local reinforcement structure based on Embodiment 2. That is, a first region 11, a second region 12 and a third region 13 are provided on the lower surface of each plywood. The first region 11 and the second region 12 are both attached with a first carbon fiber prepreg, the third region 13 is attached with a second carbon fiber prepreg, and the first carbon fiber prepreg is adhered to one side of the side support portion 14.

[0062] Example 5: Simultaneously employing heterogeneous fibers combined with a layered structure and a localized reinforcement structure.

[0063] refer to Figure 1 As shown, the shoe support plate provided in Embodiment 5 adds a local reinforcement structure based on Embodiment 1. That is, a first region 11, a second region 12 and a third region 13 are provided on the lower surface of each plywood. The first region 11 and the second region 12 are both attached with a first carbon fiber prepreg, the third region 13 is attached with a second carbon fiber prepreg, and the first carbon fiber prepreg is adhered to one side of the side support portion 14.

[0064] The support plates from Examples 1-5 and Comparative Example 1 were used in shoes of the same structure and size, and each shoe was tested. In this invention, the testing equipment used was a Footscan plantar pressure plate, model 2m 3D ADV / HE. During testing, runners wearing the corresponding shoes ran at a constant speed of 4 minutes per minute over the plantar pressure plate of the testing equipment. Kinematic, dynamic, and electromyographic data during the running process were collected by the infrared motion capture system (Vicon), force platform (AMTI), plantar pressure plate (Rsscan), and surface electromyography acquisition system (Noraxon) on the testing equipment. The influence of the corresponding shoes on the human body's force and running posture was analyzed from different perspectives. The force platform calculated the COP (Center of Pressure) by measuring three vertical force components (Fz, Mx, My) and three torque components (Mx, My, Mz). Data was collected by acquiring signals when the running foot landed, performing digital-to-analog conversion, and calculating and outputting data in real time through software. The specific testing and equipment operation methods are conventional and will not be detailed here. The data collected during the test is as follows:

[0065]

[0066] Foot rolling is a continuous movement in the gait cycle from heel strike to toe lift-off. Its core is the smooth migration of the COP (Center of Pressure) along the long axis of the foot (anteroposterior direction), while maintaining stability in the lateral direction (coronal plane) to avoid deviation interference. It should be noted that, due to the influence of factors such as runner's condition on the above tests, the data collected in the table are the average values ​​after 10 repeated measurements.

[0067] As can be seen from the table above, for the total COP displacement distance, all embodiments are smaller than the comparative example, meaning the overall gait movement path is simpler. A shorter path means less energy consumption during rolling, and the path is more concentrated along the long axis of the foot (forward-backward direction), reducing unnecessary detours. For the coronal plane offset distance, all embodiments are smaller than the comparative example, meaning the COP swing in the left-right direction is less pronounced, and the continuity of lateral roll during running is better. For the landing time, embodiments 2 and 4 shorten it by more than 3 milliseconds, while embodiments 1, 3, and 5 slightly reduce it, indicating that all embodiments can improve the rate of work done during running and have a positive impact on the core process of foot rolling. It is evident that all embodiments promote the core process of foot rolling and improve the smoothness of force transmission. Therefore, the shoe support plate provided by this invention helps reduce the left-right offset interference that occurs during running, making the running force line more centered, improving the smoothness of force transmission, and resulting in relatively high running efficiency.

[0068] The present invention has been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various modifications to the present invention based on the prior art, and these modifications all fall within the protection scope of the present invention.

Claims

1. A shoe support plate with a locally reinforced structure, comprising a laminated plate, characterized in that, The laminate includes multiple fiber layers stacked sequentially. The upper or lower surface of the laminate is divided into a first region and a second region. The first region is located at a position corresponding to the inner half of the forefoot of the human foot, and the second region is located at a position corresponding to the outer half of the heel of the human foot. Both the first region and the second region are attached with a first carbon fiber prepreg. The upper or lower surface of the laminate is further divided into a third region, which is located at a position corresponding to the inner half of the human heel. A second carbon fiber prepreg is attached to the third region, and the tensile strength and tensile modulus of the second carbon fiber prepreg are both less than those of the first carbon fiber prepreg. Both the second and third regions extend to positions corresponding to the arch of the human foot.

2. The shoe support plate with a locally reinforced structure as described in claim 1, characterized in that, A side support portion is formed on the inner side of the laminate, and the first carbon fiber prepreg is adhered to one side of the side support portion.

3. The shoe support plate with a locally reinforced structure as described in claim 2, characterized in that, The side support extends from the position corresponding to the arch of the human foot to the position corresponding to the heel of the human foot.

4. The shoe support plate with a locally reinforced structure as described in claim 1, characterized in that, The laminate has a bifurcated groove at the front, the second region is located on one side of the bifurcated groove, and the laminate has a strip-shaped hole at the side of the bifurcated groove away from the second region.

5. The shoe support plate with a locally reinforced structure as described in any one of claims 1-4, characterized in that, There are two laminates, a left laminate for the left shoe and a right laminate for the right shoe. The number of fiber layers in the left laminate is the same as that in the right laminate. Some fiber layers in the left laminate are made of different materials than those in the right laminate, and / or the laying angle of each fiber layer in the left laminate is different from the laying angle of the corresponding layer in the right laminate.

6. The shoe support plate with a locally reinforced structure as described in claim 5, characterized in that, Each fiber layer in the same plywood is divided into three layers from top to bottom: an upper layer group, a middle layer group, and a lower layer group. The upper layer group includes an even number of fiber layers, the middle layer group includes at least one fiber layer, and the fiber layer is a carbon fiber layer. The lower layer group includes an even number of fiber layers. In the left composite plate, each fiber layer in the upper layer group is a carbon fiber layer and a basalt fiber layer arranged alternately from top to bottom, and each fiber layer in the lower layer group is a carbon fiber layer and a basalt fiber layer arranged alternately from top to bottom. In the right-side laminate, each fiber layer in the upper layer group consists of alternating basalt fiber layers and carbon fiber layers arranged from top to bottom, and each fiber layer in the lower layer group consists of alternating basalt fiber layers and carbon fiber layers arranged from top to bottom.

7. The shoe support plate with a locally reinforced structure as described in claim 6, characterized in that, The carbon fiber layer in the middle layer group is made of a third carbon fiber prepreg, and the carbon fiber layers in the upper layer group and the lower layer group are made of the first carbon fiber prepreg. The tensile strength and tensile modulus of the third carbon fiber prepreg are both less than those of the second carbon fiber prepreg.

8. The shoe support plate with a locally reinforced structure as described in any one of claims 1-4, characterized in that, There are two laminates: a left laminate for the left shoe and a right laminate for the right shoe. Both the left and right laminates include multiple layers of carbon fiber stacked sequentially. The number of fiber layers in the left laminate is the same as that in the right laminate. The layup angle of each fiber layer in the left laminate is the opposite of the layup angle of the corresponding layer in the right laminate.

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