Composite sole and shoe

Abstract

The utility model discloses a composite sole which comprises a supporting layer and a flexible traction piece, the supporting layer comprises a toe area, a front middle foot area and a middle heel area, the front middle foot area is arched downwards in the first direction, the traction piece is arranged above the front middle foot area, and the traction piece is provided with a first end and a second end which are oppositely arranged in the first direction. The first end is coupled with the front side of the front middle foot area, the second end is coupled with the rear side of the front middle foot area, so that an interval space is formed between the lower portion of the traction piece and the upper portion of the front middle foot area, and the traction piece can be reversely stretched in the pedal-off stage to apply traction force pointing to the traction piece to the middle heel area. The flexible traction piece is arranged above the forefoot area and the midfoot area of the supporting layer, forward traction force is applied to the midheel area through reverse drawing force of the traction piece, the pedaling torque at the pedaling and stretching time is not changed, excellent boosting of the forefoot is kept, meanwhile, pressure of achilles tendon and shank rear side muscle groups is relieved, and the adaptive range of a runner of the running shoe is increased.

Description

Technical Field

[0001] The utility model relates to the field of shoes, in particular to a composite sole and shoes containing the composite sole. Background Art

[0002] In the 1970s, American sports brand Nike began using carbon fiber materials in running shoes to improve the stiffness and rebound performance of the soles. In the 1980s, carbon plate technology was further applied to running shoes to improve the stability and support of running shoes.

[0003] In recent years, carbon plate technology has been continuously optimized, further enhancing running shoes' performance in terms of shock absorption, energy return, and stability. Carbon plate technology has played a crucial role in the development of running shoes, from its initial simple applications to today's sophisticated optimizations, continuously improving the functionality and performance of running shoes. This technological evolution reflects the running shoe industry's continuous response and innovation to athletes' needs. The impact of carbon plate running shoes on running is primarily reflected in the following aspects: First, the carbon plate strengthens the shoe's rigidity, ensuring arch stability and providing torsional protection. Second, it increases the longitudinal bending stiffness of the forefoot, reducing the range of motion of the metatarsophalangeal joint. This shifts the ground reaction force at push-off forward at the plantar point, lengthening the ankle moment arm and increasing the ankle leverage ratio, improving push-off performance. Third, the appropriate carbon plate curvature, combined with high-performance midsole materials, can improve running economy.

[0004] However, long-distance running can generate high mechanical stress due to various muscle fiber injuries, metabolic disorders, muscle fatigue, and changes in muscle hardness and elasticity. Wearing carbon plate running shoes for long periods of time in marathons can negatively impact a runner's lower limbs, particularly the Achilles tendon. A study testing the effects of different types of running shoes on Achilles tendon load found that, compared to traditional running shoes, carbon plate running shoes significantly increased strain and stress on the Achilles tendon. A study comparing the effects of carbon plate running shoes and traditional running shoes on Achilles tendon load during running found that carbon plate running shoes significantly increased the load on the Achilles tendon. Compared to traditional running shoes, carbon plate running shoes increase stress and strain on the Achilles tendon, thereby increasing the risk of Achilles tendon injury.

[0005] The main mechanical principles of carbon plate embedded in the midsole and carbon plate running shoes increasing the load on the Achilles tendon are as follows:

[0006] The first is increased rigidity. The soles of running shoes have a high rigidity, which restricts the natural movement and deformation of the foot. This rigidity limits the natural cushioning of the foot when it touches the ground, increasing the impact force transmitted to the Achilles tendon.

[0007] The second is an increase in the lever arm. The thicker forefoot portion of the sole of a carbon plate running shoe increases the lever arm length from the point where the foot contacts the ground to the Achilles tendon. This increase in the lever arm amplifies the torque exerted on the Achilles tendon, thereby increasing the load on the tendon.

[0008] Third, plantar pressure distribution changes. Carbon plate running shoes alter plantar pressure distribution, concentrating it in the forefoot. This shift in pressure distribution increases stress at the Achilles tendon attachment point, altering the range of motion of the forefoot metatarsophalangeal joint and increasing calf muscle stiffness.

[0009] In summary, most of the existing shoe technology solutions have the following problems:

[0010] First, the carbon plate is embedded into the midsole, which increases the bending rigidity of the forefoot and generates new stress on the bones. Second, the impact of carbon plate running shoes on the calves is mainly reflected in the increase in leg stiffness, which will increase the activation of the posterior calf muscles and increase the load on the ankle joint. Wearing carbon plate shoes for a long time is prone to overuse injuries. Third, changing the mechanical properties of the carbon plate will reduce the running propulsion effect.

[0011] Therefore, compared with traditional running shoes, long-term wearing of carbon plate running shoes will increase the activity of the calf muscles and Achilles tendon during running. This will cause the Achilles tendon to bear greater tension and stress, increasing the risk of Achilles tendon injuries, including Achilles tendonitis and Achilles tendon tenosynovitis. Utility Model Content

[0012] The purpose of this utility model is to provide a composite sole that adjusts its mechanical properties based on the mechanical characteristics of the support layer during running, combined with a composite traction member, to reduce the load on the Achilles tendon and calf, and improve the applicability of the shoe. The specific technical solution is as follows:

[0013] A composite sole includes a support layer and a flexible traction member, the support layer including a toe area, a front midfoot area and a mid-heel area, the front midfoot area arches downward along a first direction, the traction member is arranged above the front midfoot area, the traction member has a first end and a second end arranged opposite to each other along the first direction, the first end is coupled to the front side of the front midfoot area, and the second end is coupled to the rear side of the front midfoot area to form a spacing space between the bottom of the traction member and the top of the front midfoot area. During the push-off phase, the traction member can be stretched in the opposite direction to apply a traction force pointing in the direction of the traction member to the mid-heel area.

[0014] Furthermore, the rigidity of the front midfoot area is a first rigidity, and the rigidity of the toe area and the mid-heel area is a second rigidity, and the first rigidity is smaller than the second rigidity, so as to increase the flexion and extension of the forefoot.

[0015] Furthermore, the first end is connected to a side of the front midfoot region close to the toe region, and the second end is connected to a side of the front midfoot region close to the mid-heel region.

[0016] Furthermore, it also includes a first elastic layer, which is fitted on top of the support layer. The first elastic layer includes a first area, a second area and a third area, which are respectively arranged corresponding to the toe area, the front midfoot area and the mid-heel area of the support layer. The first end of the traction member is connected to the side of the second area close to the first area, and the second end is connected to the side of the second area close to the third area.

[0017] Furthermore, the toe region corresponds to the toes of the human foot, the forefoot and midfoot region corresponds to the forefoot and front side of the human foot, and the mid-heel region corresponds to the back side of the midfoot and heel of the human foot.

[0018] Furthermore, the traction member is arranged corresponding to the metatarsophalangeal joint of the human foot.

[0019] Furthermore, a line connecting the midpoints between the first end and the second end of the traction member corresponds to a line connecting the forefoot metatarsophalangeal joints.

[0020] Furthermore, the traction member is a planar structure to increase the traction force of the traction member on the heel area.

[0021] Furthermore, the traction member is a line segment structure to reduce the traction force of the traction member on the heel area.

[0022] Furthermore, the line segment structure includes a first rope and a second rope arranged along a first direction, and a gap is maintained between the first rope and the second rope.

[0023] Furthermore, the traction member also has a third end and a fourth end arranged opposite to each other along the second direction, the distance between the first end and the second end is a first length, and the distance between the third end and the fourth end is a second length. The first length is 20% to 40% of the length of the sole, and the second length is 60% to 100% of the width of the sole.

[0024] Furthermore, the traction member is made of a material including polyarylate, polyimide or poly(p-phenylene benzobisoxazole).

[0025] A shoe comprises the composite sole described above.

[0026] The composite sole of the utility model has the following advantages:

[0027] By setting a flexible traction member above the front midfoot area of the support layer, and utilizing the reverse tensile force generated by the traction member being in a stretched state, the toe area and the mid-heel area are pulled toward the middle of the traction member during the push-off phase. The rigidity of the front midfoot area is lower than that of the toe area and the mid-heel area, thereby increasing the flexion range of the forefoot metatarsophalangeal joint. This does not change the rotational torque at the moment of big toe extension, does not affect or improve push-off performance, and maintains excellent forefoot propulsion while reducing the pressure on the Achilles tendon and posterior calf muscles during long-distance running, reducing the load on the ankle joint, and increasing the adaptability of racing shoes to runners. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an exploded view of the composite sole of the present utility model.

[0029] Figure 2-1 This is a three-dimensional diagram of the support layer and the traction member in the first embodiment of the composite sole of the present invention.

[0030] Figure 2-2 This is a top view of the support layer and the traction member in the first embodiment of the composite sole of the present invention.

[0031] Figure 2-3 This is a side view of the support layer and the traction member in the first embodiment of the composite sole of the present invention.

[0032] Figure 3-1 This is a schematic diagram of the structural states of the support layer and traction member of the composite sole of the present invention during the pedaling and stretching phases.

[0033] Figure 3-2 This is a schematic diagram of the structural states of the support layer and the traction member of the composite sole of the present invention during the push-off phase.

[0034] Figure 4-1 This is a three-dimensional diagram of the support layer and the traction member in the second embodiment of the composite sole of the present invention.

[0035] Figure 4-2 This is a top view of the support layer and the traction member in the second embodiment of the composite sole of the present invention.

[0036] Figure 5-1 This is a three-dimensional diagram of the first elastic layer and the traction member in the third embodiment of the composite sole of the present invention.

[0037] Figure 5-2 This is a top view of the first elastic layer and the traction member in the third embodiment of the composite sole of the present invention. DETAILED DESCRIPTION

[0038] In order to better understand the purpose, structure and function of the present invention, the composite sole of the present invention is described in detail below with reference to the accompanying drawings.

[0039] like Figures 1 to 5-2 As shown, the composite sole includes an elastic layer and a support layer stacked together, with the elastic layer and the support layer overlapping to form a sole body. The sole body may include one elastic layer or two or more elastic layers; and one support layer or two or more support layers. The two or more elastic layers and the support layer are staggered and overlapped, resulting in a composite sole with both good elasticity and stability.

[0040] The support layer of the composite sole includes the toe area, the front midfoot area and the mid-heel area. The side of the sole body close to the inner side of the human foot is defined as the inner side of the sole body, the side of the sole body close to the outer side of the human foot is defined as the outer side of the sole body, the end of the sole body close to the toe is defined as the front of the sole body, and the end of the sole body close to the heel is defined as the back of the sole body. The line connecting the front and back ends is the first direction of the sole, and the line connecting the inner side and the outer side is the second direction of the sole. The front midfoot area has a downward curvature to form a downward arch structure. A flexible traction member is arranged above the front midfoot area. The traction member is made of a high-strength, low-stretch material. The traction member is arranged above the front midfoot area in a stretched state. The traction member has a first end and a second end that are relatively arranged along a first direction. The first end is coupled with the front side of the front midfoot area, and the second end is coupled with the rear side of the front midfoot area to form a spacing space between the bottom of the traction member and the top of the front midfoot area. When the contact point of the forefoot and the ground moves forward during the push-off phase, the traction member can be stretched in the reverse direction, so that the toe area and the mid-heel area are subjected to a traction force in the first direction directed toward the traction member.

[0041] It should be noted that the above coupling includes a direct connection between the traction member and the supporting layer, as well as an indirect connection between the two via other structures.

[0042] Furthermore, the rigidity of the front and midfoot areas of the support layer is lower than that of the toe and mid-heel areas. This reduces the rigidity of the forefoot and front midfoot areas of the sole, increases the degree of deformation of the sole, and thus improves the flexion and range of motion of the foot in the corresponding parts of the foot. This reduction in rigidity improves the natural cushioning force when the foot contacts the ground, reducing the impact force transmitted to the Achilles tendon. Furthermore, the reduction in rigidity also shortens the lever arm length from the point of contact between the foot and the ground to the Achilles tendon. This shortened lever arm reduces the torque borne by the Achilles tendon, thereby alleviating the load on the Achilles tendon.

[0043] The composite sole of the present invention adjusts its mechanical properties in combination with the mechanical characteristics of the support layer during running. It adopts a composite arrangement of an elastic layer and a support layer, and a flexible traction member is arranged above the front midfoot area of the support layer. The reverse tensile force generated by the traction member being in a stretched state is used to move the toe area and the mid-heel area toward the middle of the traction member in a first direction toward the middle of the traction member when the forefoot rolls from back to front during the push-off phase, so as to keep the support layer from deforming easily during the push-off phase. In addition, the rigidity of the front midfoot area is lower than that of the toe area and the mid-heel area, so as to reduce the bending rigidity of the forefoot, increase the bending range of the forefoot metatarsophalangeal joint, and reduce the impact force of the ground on the forefoot and Achilles tendon. At the same time, the bending amplitude of the forefoot metatarsophalangeal joint is increased, and the lever fulcrum of the forefoot is moved rearward relative to the high-rigidity support layer, thereby reducing the ankle joint resistance arm, reducing the torque on the Achilles tendon, and reducing the load on the Achilles tendon. The low-ductility traction member is in a relaxed state when the forefoot metatarsophalangeal joint is at maximum bending, without reverse tension, thereby ensuring the mobility of the forefoot area.

[0044] In summary, the composite sole of the present invention provides a stretched traction member above the support layer, which does not change the pedaling torque at the time of big toe extension, does not affect or improve the push-off performance, maintains excellent forefoot propulsion, reduces the pressure on the Achilles tendon and calf muscles during long-distance running, reduces the load of the sole on the ankle joint, and improves the applicability of the composite sole and shoe.

[0045] In order to better understand the purpose, structure and function of the present invention, the composite sole of the present invention will be described in further detail below with reference to the accompanying drawings, taking the specific structure of the composite sole as an example.

[0046] Example 1 Figure 1 As shown, the composite sole is composed of an elastic layer, a support layer 20, and a traction member 40 disposed above the support layer 20. The elastic layer and the support layer 20 have different elasticities and hardnesses. The elastic layer includes a first elastic layer 10 and a second elastic layer 30, both made of highly elastic materials with excellent elastic properties. The first elastic layer 10 and the second elastic layer 30 are stacked one above the support layer 20 and the second elastic layer 30 below it. The support layer 20 comprises a thin plate structure made of a hard material, providing excellent support performance. It includes a toe region 21, a front midfoot region 22, and a mid-heel region 23. The front and rear ends of the traction member 40 are connected to the front midfoot region 22 of the support layer 20. The first elastic layer 10, the traction member 40, the support layer 20, and the second elastic layer 30 are stacked and composited to form the overall structure of the composite sole. According to the early results of shoe biomechanics and human wearing trials, this preferred superposition method is conducive to production technology and provides better comfort and force feedback.

[0047] Specifically, such as Figure 2-1 to Figure 2-3 As shown, the toe area 21 of the support layer 20 corresponds to the toes of the human foot, the front midfoot area 22 corresponds to the forefoot and the front side of the midfoot of the human foot, and the mid-heel area 23 corresponds to the back side of the midfoot and the heel of the human foot. The front midfoot area 22 arches downward along the first direction to form a concave structure with high height on the front and back sides and low center, so as to constitute a bending and activity space for the metatarsophalangeal joint in the forefoot area of the foot, avoid affecting the normal dorsiflexion of the foot, and improve the exercise effect.

[0048] The flexible traction member 40 is a fiber or fabric with high-strength and low-elongation material properties, such as polyaromatic resin, polyimide or poly(p-phenylene benzobisoxazole). The traction member 40 is in a square planar structure in its unfolded state. The square here includes a rectangular structure with symmetrical sides of equal length parallel lines, and a quadrilateral structure with some curvature or symmetrical sides that are not completely equal but is rectangular as a whole. The traction member 40 has a first end 41 and a second end 42 on the front and rear sides, respectively, and a third end 43 and a fourth end 44 on the inner and outer sides, respectively. The first end 41 is connected to the side of the front midfoot region 22 of the support layer 20 close to the toe direction, and the second end 42 is connected to the side of the front midfoot region 22 of the support layer 20 close to the heel direction. After the connection, the traction member 40 is in a stretched and tensioned state, thereby enclosing an arched spacing space 24 below the traction member 40 and above the front midfoot region 22 of the support layer 20. The traction member 40 can be directly connected to the support layer 20 in a composite arrangement.

[0049] The purpose of setting the above structure is to Figure 3-1 As shown, during the extension phase of the foot contacting the ground, the bending angle of the forefoot metatarsophalangeal joint gradually increases. When the metatarsophalangeal joint is at the maximum bending angle, the pressure on the front midfoot area 22 of the support layer 20 reaches the maximum peak value. The metatarsophalangeal joint is located in the middle position of the front midfoot area 22. Therefore, the middle of the front midfoot area 22 of the support member is subjected to the greatest pressure, which reduces the distance between the front and rear ends of the front midfoot area 22, and the distance between the first end 41 and the second end 42 and the connection position of the support layer 20 is reduced accordingly. The traction member 40 has flexible characteristics, thereby switching from a stretched tension state to a bent relaxation state, without reverse tension. The reverse tension here refers to the tensile force in the first direction, directed from the front and rear ends of the sole to the middle direction. The absence of reverse tension means that the traction member 40 does not generate a pulling force in the middle direction on the support layer 20.

[0050] In addition, if Figure 3-2As shown, during the push-off phase, the contact point between the heel and the sole support layer 20 is located at the first point 25, and the contact point between the forefoot sole support layer 20 is located at the second point 26. As the contact point between the sole of the foot and the sole gradually moves forward, the first point 25 moves forward accordingly, applying downward pressure to the front side of the support layer 20, so that the distance between the front and rear ends of the support layer 20 gradually increases, that is, the distance between the first end 41, the second end 42 and the connection position of the support layer 20 increases accordingly. Since the traction member 40 has the characteristics of high strength and low ductility, it generates reverse stretching after reaching the maximum amplitude of the stretched state. The stretching force forms a traction in the middle direction on the front and rear ends of the support layer 20 through the first end 41 and the second end 42, thereby preventing the front and rear ends of the support layer 20 from deforming downward, that is, keeping the support layer 20 not easily deformed, and forming a forward and upward thrust on the heel through the second point 26, thereby increasing the push-off effect and maintaining and improving the athletic performance.

[0051] It can be understood that the specific shape of the above-mentioned traction member 40 can be set to a trapezoid, triangle, circle or other shapes according to actual needs, and the first end 41 and the second end 42 can be set to a point structure to connect with the support layer 20, as long as the traction member 40 can have no reverse tension in the extension stage and generate reverse tension in the separation stage so that the support layer 20 is not easily deformed.

[0052] In this embodiment, the traction member 40 is configured to be square, and a traction region with a larger surface area is formed between the first end 41, the second end 42, the third end 43 and the fourth end 44. That is, the area of the traction region covers more of the front midfoot area 22. As a result, a larger reverse tensile force can be generated between the first end 41 and the second end 42 of the traction member 40, thereby providing a greater forward and upward thrust to the mid-heel area 23.

[0053] Furthermore, the rigidity of the forefoot and midfoot regions 22 is a first rigidity, and the rigidity of the toe region 21 and the mid-heel region 23 is a second rigidity. The first rigidity is less than the second rigidity. Since the metatarsophalangeal joint of the forefoot corresponds to the forefoot and midfoot region 22, by reducing the rigidity of the forefoot and midfoot region 22, the flexion range of the metatarsophalangeal joint of the forefoot is increased, that is, the flexion and extension of the forefoot is increased, thereby reducing the impact force of the ground on the forefoot and Achilles tendon.

[0054] At the same time, due to the increase in the bending range of the forefoot metatarsophalangeal joint, the lever fulcrum where the forefoot contacts the ground moves backward relative to the support layer 20 with high rigidity during the extension phase, thereby reducing the resistance arm distance 27 between the fulcrum and the ankle joint, thereby reducing the torque on the Achilles tendon and achieving the effect of reducing the load on the Achilles tendon.

[0055] It can be understood that since the first rigidity is less than the second rigidity, the contact distance between the forefoot and the ground in the extension phase is moved backward, which is equivalent to not changing the rotational torque at the time of big toe extension, thereby not affecting or improving the athletic performance of pushing off. Moreover, in the push-off phase, the traction member 40 can be stretched in the opposite direction, applying a traction force directed to the traction member 40 to the toe area 21 and the mid-heel area 23 of the support layer 20, while continuing to maintain the excellent propulsion of the forefoot, reducing the pressure on the Achilles tendon and the posterior calf muscles during long-distance running, reducing the load on the ankle joint, and avoiding overuse injuries, that is, improving comfort and increasing the applicable population of the soles and shoes of the present invention.

[0056] The above-mentioned first rigidity being smaller than the second rigidity is achieved by reducing the amount of carbon fiber used, that is, reducing the number of layers of carbon fiber unidirectional prepreg tape, so that the number of layers of the portion with the second rigidity is more and the number of layers of the portion with the first rigidity is less.

[0057] Furthermore, the toe area 21, the front midfoot area 22 and the mid-heel area 23 on the support layer are provided as an integrally formed structure to enhance the structural strength of the support layer and improve the forward and upward thrust.

[0058] Preferably, the distance between the first end 41 and the second end 42 is a first length, and the distance between the third end 43 and the fourth end 44 is a second length. The first length is 20% to 40% of the sole length, where the sole length refers to the maximum length of the front and rear ends of the sole. The second length is 60% to 100% of the inner and outer widths of the sole, where the inner and outer widths of the sole refer to the width of the widest parts of the inner and outer sides of the sole located in the front midfoot area 22. The above length setting can make the metatarsophalangeal joint of the forefoot correspond to the traction member 40, and the traction member 40 in the mid-forefoot area has a larger surface area, which can enhance the stretching of the traction member 40 on the front and rear areas of the support layer 20, and maintain or increase the thrust of the support member.

[0059] Preferably, the traction member 40 is arranged to correspond to the metatarsophalangeal joint of the human foot, so that each bending position of the metatarsophalangeal joint corresponds to the traction member 40, thereby enhancing the reverse stretch of the traction member 40 during the push-off phase. Furthermore, the line connecting the midpoints of the first end 41 and the second end 42 of the traction member 40 corresponds to the line connecting the metatarsophalangeal joint of the forefoot. Correspondence here includes both complete vertical correspondence between the two lines and a slight vertical deviation in distance and angle. The purpose of this structural arrangement is to maintain an equal distance between the first end 41 and the second end 42 and the metatarsophalangeal joint, so that the metatarsophalangeal joint exerts relatively equal pressure on the first end 41 and the second end 42 of the traction member 40, avoiding pressure biased towards one end and reducing the bending amplitude of the metatarsophalangeal joint, preventing the lever fulcrum where the forefoot contacts the ground from moving forward, reducing the torque on the Achilles tendon, and achieving the effect of reducing the load on the Achilles tendon.

[0060] Example 2 Figure 4-1 to Figure 4-2 As shown, the difference from the first embodiment is that the traction member 40 is a line segment structure, and the traction force of the traction member 40 on the heel area 23 is reduced by reducing the structural strength between the first end 41 and the second end 42.

[0061] Preferably, the traction member 40 with a segment structure includes a first rope 45 and a second rope 46, the first end 41 of the first rope 45 and the second rope 46 is connected to one end of the front midfoot area 22 close to the toe area 21, the second end 42 of the first rope 45 and the second rope 46 is connected to one end of the front midfoot area 22 close to the mid-heel area 23, the first rope 45 and the second rope 46 are arranged along the first direction, and a gap is maintained in the middle to form reverse stretching on the inner and outer sides of the support layer 20, respectively, wherein the first rope 45 is the third end 43 of the traction member 40, and the second rope 46 is the fourth end 44 of the traction member 40.

[0062] The above-mentioned structural setting is aimed at users with a certain sports foundation or in the training stage. By reducing the surface area of the traction member 40, the flexibility of the forefoot metatarsophalangeal area is increased. This structure also allows the metatarsophalangeal joint to have a larger flexion and extension range, thereby recruiting more muscle units and strengthening muscle training.

[0063] It is understandable that those skilled in the art can increase or decrease the number of ropes in the segment structure according to actual needs, as long as the flexibility of the forefoot metatarsophalangeal area can be increased to achieve a greater flexion and extension range of the metatarsophalangeal joint.

[0064] Example 3 Figure 5-1 to Figure 5-2 As shown, the difference from the first embodiment is that the traction member 40 is attached above the first elastic layer 10. The first elastic layer 10 includes a first area, a second area, and a third area, which are respectively arranged corresponding to the toe area 21, the front midfoot area 22, and the mid-heel area 23 of the support layer 20. The first end 41 of the traction member 40 is connected to the side of the second area close to the first area, and the second end 42 is connected to the side of the second area close to the third area.

[0065] Specifically, the traction member 40 is set to be square, and a traction area with a large surface area is formed between the first end 41, the second end 42, the third end 43 and the fourth end 44. As a result, the first end 41 and the second end 42 of the traction member 40 form a reverse stretching pointing to the second area on the front and rear ends of the first elastic layer 10, and then the first elastic layer 10 guides the front and rear ends of the support layer 20 to be stretched.

[0066] Compared with directly connecting the traction member 40 to the support layer 20, the purpose of the above-mentioned structural setting is that the traction member 40 is indirectly connected to the support layer 20 through the first elastic layer 10, thereby slowing down the speed and strength of the reverse stretching of the support layer 20 by the traction member 40. At the same time, the first end 41 and the second end 42 of the traction member 40 are connected to the first elastic layer 10 by a line segment, which can provide a greater forward and upward thrust for the mid-heel area 23.

[0067] The elastic layer can be made of one, two or more materials selected from the group consisting of nylon elastomer, polyurethane (thermoplastic polyurethane (including aromatic and aliphatic types), cast polyurethane, and mixed polyurethane), thermoplastic polyether ester elastomer, ethylene-octene copolymer, ethylene-octene block copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer, high styrene rubber, brominated butyl rubber, butadiene rubber, silicone rubber, EPDM rubber, natural rubber, isoprene rubber, nitrile rubber, and chloroprene rubber using a supercritical foaming or chemical foaming process. The elastic layer is characterized by a hardness of 40-45°C and a density of 0.12-0.18 g / cm 3 The material is lightweight, soft, and elastic, providing excellent shock absorption and rebound during running. The elastic layer's forefoot area is uniformly thick, and its curvature follows the curvature of the forefoot area of the rigid support layer 20. This helps maintain consistent dynamic deformation during pushing and stretching, improving comfort during repetitive motion (running).

[0068] The above-mentioned hard support layer 20 has a Shore D hardness of 50-95 and is a support plate made of other hard materials, such as epoxy resin, phenolic resin or thermoplastic resin (thermoplastic polyurethane, polycarbonate, polymethyl methacrylate, nylon elastomer, polyether ester elastomer, polyketone, polyether ether ketone, polyether ketone ketone, polyether sulfone, polyphenylene sulfide, ABS (acrylonitrile-butadiene-styrene copolymer) or a composite material formed with inorganic fillers or long fibers or short fibers (not limited to carbon fiber, glass fiber, aramid, poly(p-phenylene benzobisoxazole), polyimide, ultra-high molecular weight polyethylene fiber, polyarylate fiber, polyether ether ketone, polyether ketone ketone, basalt fiber, polyvinyl alcohol, nylon, polyester fiber, etc.).

[0069] The shoe sole further includes an outsole 50 disposed below the second elastic layer 30. The outsole 50 is formulated with a material that exhibits both excellent anti-slip properties and fatigue wear resistance. Using the thinnest outsole 50, the material can meet the demands of running, effectively reducing the thickness and weight of the sole, achieving the lightweight design goal, and providing the wearer with a better wearing experience. The outsole 50 is made of one or more of the following: styrene-butadiene rubber, bromobutyl rubber, butadiene rubber, silicone rubber, EPDM rubber, natural rubber, isoprene rubber, nitrile rubber, chloroprene rubber, nylon elastomer, polyurethane (thermoplastic polyurethane (including aromatic and aliphatic types), cast polyurethane, mixed polyurethane), thermoplastic polyetherester elastomer, ethylene-octene copolymer, ethylene-octene block copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer, and high styrene rubber. The outsole 50 is cast polyurethane and has excellent wear resistance with the following properties: hardness (Shore A) 62, density 1.20 g / cm3, tensile strength 13.4 MPa, elongation at break 632%, right-angle tear strength 59.6 N / mm, Akron abrasion (1.61 km) 0.03 cm3, DIN abrasion 11 mm3, yellowing resistance level 4, aging resistance level 4.

[0070] The utility model also provides a shoe comprising the composite sole described above.

[0071] In order to provide the best force feedback performance with the support layer, we use nylon elastomer material in the first and second elastic layers. Its advantage is that the density is 0.12-0.14g / cm 3 , Shore C hardness is 42±3, rebound rate (Energyreturn) is 80%, peak acceleration (Peak G) is 10.1; providing light + high elastic effect.

[0072] The support layer is a hard support plate made of carbon fiber / polyarylate / epoxy resin composite material. Each layer is 0.1mm thick, with a total thickness of 1.0-1.6mm. The layering method is strong rigidity from the waist to the heel, weak rigidity in the forefoot, and the material layering in the mid-heel area is as follows:

[0073] (1) The first layer is 3K carbon fiber twill;

[0074] (2) second layer of 20-degree pre-impregnated carbon fiber unidirectional tape;

[0075] (3) The third layer -20 degree pre-impregnated carbon fiber unidirectional tape;

[0076] (4) the fourth layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0077] (5) The fifth layer - 45 degree pre-impregnated carbon fiber unidirectional tape;

[0078] (6) sixth layer of 20-degree pre-impregnated carbon fiber unidirectional tape;

[0079] (7) Seventh layer - 20 prepreg carbon fiber unidirectional tape;

[0080] (8) Eighth layer - 45 degree pre-impregnated carbon fiber unidirectional tape;

[0081] (9) ninth layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0082] (10) Tenth layer - 20 degree pre-impregnated carbon fiber unidirectional tape;

[0083] (11) eleventh layer of 20 degree pre-impregnated carbon fiber unidirectional tape;

[0084] (12) The twelfth layer is 0-degree pre-impregnated carbon fiber unidirectional tape.

[0085] The toe area is partially layered with

[0086] (1) The first layer is 20-degree pre-impregnated carbon fiber unidirectional tape;

[0087] (2) The second layer of -20 degree pre-impregnated carbon fiber unidirectional tape;

[0088] (3) the third layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0089] (4) The fourth layer - 45 degree pre-impregnated carbon fiber unidirectional tape;

[0090] (5) The fifth layer of 20-degree pre-impregnated carbon fiber unidirectional tape;

[0091] (6) Sixth layer - 20 prepreg carbon fiber unidirectional tape;

[0092] (7) Seventh layer - 45 degree pre-impregnated carbon fiber unidirectional tape;

[0093] (8) The eighth layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0094] (9) Ninth layer -20 degree pre-impregnated carbon fiber unidirectional tape;

[0095] (10) The tenth layer is 20-degree pre-impregnated carbon fiber unidirectional tape.

[0096] The material layer of the front midfoot is:

[0097] (1) The first layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0098] (2) The second layer - 45 degrees pre-impregnated carbon fiber unidirectional tape;

[0099] (3) the third layer of 20-degree pre-impregnated carbon fiber unidirectional tape;

[0100] (4) The fourth layer - 20 degrees pre-impregnated carbon fiber unidirectional tape;

[0101] (5) The fifth layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0102] (6) The sixth layer is 45% prepreg carbon fiber unidirectional tape.

[0103] The traction part is partially made of polyaromatic woven fabric.

[0104] Another type of layer is that the first elastic layer and the third elastic layer are made of nylon elastomer material, which has the advantage of a density of 0.12-0.14g / cm 3 , Shore C hardness is 42±3, rebound rate (Energy return) is 80%, peak acceleration (Peak G) is 10.1; providing light + high elastic effect.

[0105] The support layer is a hard support plate, which is a carbon fiber / poly(p-phenylene benzobisoxazole) (PBO) / epoxy resin composite material. The thickness of each layer is 0.1mm, and the total thickness is 1.0-1.6mm. The plywood is laid in a way that the rigidity is strong from the mid-waist to the heel and the rigidity is weak from the forefoot.

[0106] Part of the material layer in the heel area is:

[0107] (1) The first layer is 3K carbon fiber twill;

[0108] (2) second layer of 20-degree pre-impregnated carbon fiber unidirectional tape;

[0109] (3) The third layer -20 degree pre-impregnated carbon fiber unidirectional tape;

[0110] (4) the fourth layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0111] (5) The fifth layer - 45 degree pre-impregnated carbon fiber unidirectional tape;

[0112] (6) sixth layer of 20-degree pre-impregnated carbon fiber unidirectional tape;

[0113] (7) Seventh layer - 20 prepreg carbon fiber unidirectional tape;

[0114] (8) Eighth layer - 45 degree pre-impregnated carbon fiber unidirectional tape;

[0115] (9) ninth layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0116] (10) Tenth layer - 20 degree pre-impregnated carbon fiber unidirectional tape;

[0117] (11) eleventh layer of 20 degree pre-impregnated carbon fiber unidirectional tape;

[0118] (12) The twelfth layer is 0-degree pre-impregnated carbon fiber unidirectional tape.

[0119] The material layup in the toe area is as follows:

[0120] (1) The first layer is 20-degree pre-impregnated carbon fiber unidirectional tape;

[0121] (2) The second layer of -20 degree pre-impregnated carbon fiber unidirectional tape;

[0122] (3) the third layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0123] (4) The fourth layer - 45 degree pre-impregnated carbon fiber unidirectional tape;

[0124] (5) The fifth layer of 20-degree pre-impregnated carbon fiber unidirectional tape;

[0125] (6) Sixth layer - 20 prepreg carbon fiber unidirectional tape;

[0126] (7) Seventh layer - 45 degree pre-impregnated carbon fiber unidirectional tape;

[0127] (8) The eighth layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0128] (9) Ninth layer -20 degree pre-impregnated carbon fiber unidirectional tape;

[0129] (10) The tenth layer is 20-degree pre-impregnated carbon fiber unidirectional tape.

[0130] The material layer of the front midfoot is:

[0131] (1) The first layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0132] (2) The second layer - 45 degrees pre-impregnated carbon fiber unidirectional tape;

[0133] (3) the third layer of 20-degree pre-impregnated carbon fiber unidirectional tape;

[0134] (4) The fourth layer - 20 degrees pre-impregnated carbon fiber unidirectional tape;

[0135] (5) The fifth layer of 45-degree pre-impregnated carbon fiber unidirectional tape;

[0136] (6) The sixth layer is 45% prepreg carbon fiber unidirectional tape.

[0137] The traction part is partially made of poly(p-phenylene benzobisoxazole) (PBO) woven fabric.

[0138] Through biomechanical testing, it was found that compared with full-palm carbon plate running shoes, the flexion and extension range of the forefoot of the shoe provided by the utility model is increased by 5%, which reduces the high rigidity control threshold of carbon plate running shoes and increases the runner adaptability of racing carbon plate running shoes.

[0139] Peak ankle torque decreased by 1%, and Achilles tendon tension and stiffness decreased by 8.8% and 18.3%, respectively, slowing Achilles tendon fatigue to a certain extent, making it more conducive to long-distance running competitions or training. The overall performance of push-off and extension is similar to that of a full-length carbon fiber plate.

[0140] The terms “above”, “below” and “within” mentioned above include the number itself; the terms “exceed” and “outside” do not include the number itself.

[0141] The present invention has been further described above with the aid of specific embodiments. However, it should be understood that the specific descriptions herein should not be construed as limiting the essence and scope of the present invention. Any modifications made to the above embodiments by a person skilled in the art after reading this specification are within the scope of protection of the present invention. The various specific technical features described in the above specific embodiments may be combined in any suitable manner unless there is any contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations in the embodiments.

[0142] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

Claims

1. A composite sole, characterized in that: The shoe comprises a support layer and a flexible traction member, the support layer comprising a toe area, a front midfoot area and a mid-heel area, the front midfoot area arches downward along a first direction, the traction member is arranged above the front midfoot area, the traction member has a first end and a second end arranged opposite to each other along the first direction, the first end is coupled to the front side of the front midfoot area, and the second end is coupled to the rear side of the front midfoot area to form a spacing space between the bottom of the traction member and the top of the front midfoot area. During the push-off phase, the traction member can be stretched in the opposite direction to apply a traction force to the mid-heel area in the direction of the traction member.

2. The composite sole according to claim 1, characterized in that: The rigidity of the front midfoot area is the first rigidity, and the rigidity of the toe area and the mid-heel area is the second rigidity. The first rigidity is smaller than the second rigidity, so as to increase the flexion and extension of the forefoot.

3. The composite sole according to claim 1, wherein: The first end is connected to a side of the front midfoot region close to the toe region, and the second end is connected to a side of the front midfoot region close to the mid-heel region.

4. The composite sole according to claim 1, wherein: The first elastic layer is also included, and the first elastic layer is fitted on the support layer. The first elastic layer includes a first area, a second area and a third area, which are respectively arranged corresponding to the toe area, the front midfoot area and the mid-heel area of the support layer. The first end of the traction member is connected to a side of the second area close to the first area, and the second end is connected to a side of the second area close to the third area.

5. The composite sole according to any one of claims 1 to 4, characterized in that: The toe region corresponds to the toes of the human foot, the forefoot and midfoot region corresponds to the forefoot and front side of the human foot, and the mid-heel region corresponds to the back side of the midfoot and heel of the human foot.

6. The composite sole according to claim 5, characterized in that: The traction piece is arranged corresponding to the metatarsophalangeal joint of the human foot.

7. The composite sole according to claim 6, characterized in that: A line connecting the midpoints between the first end and the second end of the traction member corresponds to a line connecting the forefoot metatarsophalangeal joints.

8. The composite sole according to any one of claims 1 to 4, characterized in that: The traction member is a planar structure to increase the traction force of the traction member on the heel area.

9. The composite sole according to claim 3, wherein: The traction member is a line segment structure to reduce the traction force of the traction member on the heel area.

10. The composite sole according to claim 9, characterized in that The line segment structure includes a first rope and a second rope arranged along a first direction, and a gap is maintained between the first rope and the second rope.

11. The composite sole according to claim 1 or 10, characterized in that: The traction member further has a third end and a fourth end arranged opposite to each other along the second direction, the distance between the first end and the second end is a first length, and the distance between the third end and the fourth end is a second length. The first length is 20% to 40% of the length of the sole, and the second length is 60% to 100% of the width of the sole.

12. The composite sole according to claim 1, wherein: The traction member is made of a material including polyarylate, polyimide or poly(p-phenylene benzobisoxazole).

13. A shoe, characterized in that: The composite shoe sole comprises the composite shoe sole according to any one of claims 1 to 12.

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