EP2939558B1 - Midsole for reducing load applied on knee - Google Patents
Midsole for reducing load applied on knee Download PDFInfo
- Publication number
- EP2939558B1 EP2939558B1 EP15152468.3A EP15152468A EP2939558B1 EP 2939558 B1 EP2939558 B1 EP 2939558B1 EP 15152468 A EP15152468 A EP 15152468A EP 2939558 B1 EP2939558 B1 EP 2939558B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- soft
- arch
- midsole
- foot
- hard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/12—Soles with several layers of different materials
- A43B13/125—Soles with several layers of different materials characterised by the midsole or middle layer
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/38—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process
- A43B13/383—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process pieced
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/141—Soles; Sole-and-heel integral units characterised by the constructive form with a part of the sole being flexible, e.g. permitting articulation or torsion
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/16—Pieced soles
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
- A43B13/181—Resiliency achieved by the structure of the sole
- A43B13/186—Differential cushioning region, e.g. cushioning located under the ball of the foot
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/38—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process
- A43B13/40—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process with cushions
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/38—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process
- A43B13/41—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process combined with heel stiffener, toe stiffener, or shank stiffener
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B7/00—Footwear with health or hygienic arrangements
- A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
- A43B7/18—Joint supports, e.g. instep supports
Definitions
- the present invention relates to a midsole which reduces a load applied to a knee, and more particularly, to a midsole which reduces a load applied to a knee, in which a first soft portion and a second soft portion are disposed at a front inner side and a rear inner side so as to allow an inner knee to relatively and smoothly move, thereby reducing impact and load concentrated on an inner knee joint, and expecting improved exercise capacity.
- a shoe 1, which is generally used mainly includes a sole 2, and an upper 3 coupled to an upper portion of the sole 2.
- the sole 2 includes an outsole 2a which is a bottom sole of the shoe, and a midsole 2b which is an intermediate sole of the shoe.
- the outsole 2a is made of a rubber material so as to endure wear resistance and a function of preventing sliding
- the midsole 2b is often made of a foamed and expanded synthetic resin material so as to form the lightweight shoe 1 by reducing the overall weight of the shoe 1, absorb impact when impact is applied to the shoe 1, and provide restoring force.
- the number of female patients was 36,000 (in 2009), and is seven times more than the number of male patients.
- the number of male patients of all ages consistently increased over the past five years, while the number of female patients in their thirties or less and seventies or more slowly increased, and the number of female patients in their forties to sixties rapidly increased.
- the number of patients per 100,000 people by regional groups is 108.2 in Seoul, 97.1 in Busan, and 97.0 in Jeollabuk-do in order of decreasing number, and the number of patients is higher in big cities.
- Impact is absorbed and thrusting force is created during a process in which a person steps on the ground from the heel to the big toe in accordance with movement of the foot, but in the case of the patients with injuries to the knee, particularly, arthritic patients, movement of adduction applied to an inner knee is increased, which causes damage to inner cartilages.
- FIG. 8 is a perspective view illustrating a midsole in the related art.
- Korean Patent No. 10-1075172 discloses a midsole which includes a flex 1, a heel portion 2, and a heel cap 3 formed by joining three pieces having different hardness, and the midsole is configured to distribute and absorb impact and load directly applied to a lower side of a heel of a foot, and allow a user to conveniently walk.
- the aforementioned Korean Patent is excellent in terms of a function of absorbing impact, but does not present a technical configuration regarding a structure for reducing impact and load concentrated on the knee joints in consideration of movement characteristics of the knee joints.
- Korean Patent Application Laid-Open No. 10-2000-0017890 (Apr il 6, 2000) Korean Patent No. 10-1075172 (October 19, 2011 ). Further prior art regarding a midsole is known from US 2006/0137228 A1 and US 2012/0233877 A1 .
- the midsole described in US 2006/0137228 A1 comprises four parts to form the whole midsole.
- a lower midsole body which comprises a front part and a rear part that are formed with soft material, while these parts are separated by a middle reinforcing member constructed of hard material like ABS, FRP (Fiber Reinforced Plastic) or similar materials.
- a middle reinforcing member constructed of hard material like ABS, FRP (Fiber Reinforced Plastic) or similar materials.
- the front part as well as the rear part of the lower midsole body is manufactured over their whole surface by the same soft material, this arrangement does not show the flexibility and comfort and conveniences to adapt the front part and the rear part of the midsole to areas of harder material and soft material, which allows a better support of the foot where it is necessary.
- the outer instep of the foot may be supported by harder material like the area of the ball of the foot.
- the invention relates to a midsole as specified in claim 1. Preferred embodiments are specified in the dependent claims.
- the present invention has been made in an effort to provide a midsole, in which a first soft portion and a second soft portion are disposed at a front inner side and a rear inner side so as to allow an inner knee to relatively and smoothly move, thereby reducing impact and load concentrated on an inner knee joint, and expecting improved exercise capacity.
- the present invention has also been made in an effort to provide a midsole which reduces a load applied to a knee, in which inclined surfaces are formed at a soft portion and a hard portion, and the inclined surfaces are joined together, thereby minimizing inconvenience caused by a difference in hardness.
- the present invention has also been made in an effort to provide a midsole which reduces a load applied to a knee, in which an arch shank, which has greater hardness than a hard portion, is formed at an arch portion, thereby improving functions of distributing and absorbing impact using elastic actions of an arch and a foot arch.
- An exemplary embodiment of the present invention provides a midsole which reduces a load applied to a knee, the midsole including: a first soft portion which is formed at a front inner side based on an arch portion of a foot; a second soft portion which is formed at a rear inner side based on the arch portion of the foot; and a hard portion which is formed in the remaining region except for the first and second soft portions and in a region of the arch portion of the foot, and has greater hardness than the first and second soft portions, the first soft portion is formed at the front inner side, the second soft portion is formed at the rear inner side, the first soft portion and the second soft portion are spaced apart from each other in a forward and rearward direction based on a foot arch region and formed in an inner region of the foot, and the hard portion is formed at the arch portion of the foot and at a front outer side and a rear outer side of the arch portion.
- the first soft portion and the second soft portion may have the same hardness.
- a hardness ratio of the soft portion to the hard portion may be 1:1.1 to 1.6.
- the soft portion and the hard portion may be joined together while being in direct contact with each other.
- the soft portion and the hard portion may have inclined cross sections that are vertically joined together, respectively, and a value of hardness in a region where the soft portion and the hard portion are joined together may be between a value of hardness of the soft portions and a value of hardness of the hard portion.
- An arch shank which has greater hardness than the hard portion, may be installed in a region of the hard portion which corresponds to the arch portion of the foot.
- the arch shank may be installed in a foot arch region between the first soft portion and the second soft portion.
- the midsole may be configured to be inserted into an outsole having a bottom portion and a side wall portion.
- the first soft portion and the second soft portion are disposed at the front inner side and the rear inner side so as to allow an inner knee to relatively and smoothly move, thereby reducing impact and load concentrated on an inner knee joint, and expecting improved exercise capacity.
- the inclined surfaces are formed at the soft portion and the hard portion, and the inclined surfaces are joined together, thereby minimizing inconvenience caused by a difference in hardness.
- the arch shank which has greater hardness than the hard portion, is formed at the arch portion, thereby improving functions of distributing and absorbing impact using elastic actions of the arch and the foot arch and reducing a load applied to a knee.
- FIG. 1 is a top plan view illustrating a first exemplary embodiment of a midsole according to the present invention which reduces a load applied to a knee
- FIG. 2 is a cross-sectional view taken along line A-A, which illustrates a second exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee.
- a midsole 10 which reduces a load applied to a knee, mainly includes a first soft portion 11, a second soft portion 13, and a hard portion 15, and is disposed between an outsole and an insole of a shoe.
- the midsole 10 which reduces a load applied to the knee, may include the first soft portion 11 which is formed at a front inner side based on an arch portion of a foot, the second soft portion 13 which is formed at a rear inner side based on the arch portion of the foot, and the hard portion 15 which is formed in the remaining region except for the first and second soft portions 11 and 13 and in a region of the arch portion of the foot, and has greater hardness than the first and second soft portions 11 and 13.
- the first soft portion 11 and the second soft portion 13 are spaced apart from each other in a forward and rearward direction based on a foot arch region, and formed in an inner region of the foot.
- the first soft portion 11 is formed in a front inner side region including a big toe portion, and serves to allow the big toe, which creates thrusting force when a user walks or runs, to smoothly move.
- the second soft portion 13 is formed in a rear inner side region including an inner side of a heel, and serves to absorb load or impact when the user steps on the ground, and to allow the knee to smoothly move.
- Both of the first soft portion 11 and the second soft portion 13 may be made of the same material, for example, ethylene-vinyl acetate, and may have the same hardness. However, the first soft portion and the second soft portion may be made of different materials as long as the first soft portion and the second soft portion have the same hardness.
- the hard portion 15 is formed at the arch portion of the foot and at a front outer side and a rear outer side of the arch portion, and is harder than the soft portion, and has greater hardness than the soft portion.
- a hardness ratio of the soft portion to the hard portion may be 1:1.1 to 1.6.
- a hardness ratio is higher than the aforementioned range
- a hardness ratio of the second soft portion to the hard portion is higher than 1:1.6
- wearing comfort deteriorates due to a difference in hardness, and there is a risk that an ankle portion will be injured when the user steps on the ground.
- the hardness ratio may be within the aforementioned range.
- FIG. 3 is a cross-sectional view taken along line A-A, which illustrates the second exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee.
- the soft portions 11 and 13 and the hard portion 15 are joined together while being in direct contact with each other, and may be configured to have inclined cross sections 11a, 15a, 13a, and 15b that are vertically joined together, respectively.
- the inclined cross sections 11a and 13a of the soft portions 11 and 13 may be disposed over the inclined cross sections 15a and 15b of the hard portion 15, and vice versa.
- the reason why the inclined cross sections are formed at the soft portions and the hard portion and then the inclined cross sections are joined together, as described above, is to prevent heterogeneity caused by a difference in hardness between the soft portions and the hard portion, and minimize deterioration in wearing comfort.
- the aforementioned configuration allows boundaries between the soft portions and the hard portion to have intermediate hardness values, and serves to prevent the hardness from being rapidly changed in a stepwise manner.
- FIGS. 4A and 4B are cross-sectional views taken along line B-B, which illustrate a third exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee.
- an arch shank 17, which has greater hardness than the hard portion 15, may be installed in a region of the hard portion 15 which corresponds to the arch portion of the foot, and for example, the arch shank 17 may be joined to a bottom of the hard portion.
- the arch shank 17 serves to more rigidly support the arch portion of the foot.
- the first soft portion and the second soft portion are disposed in a region corresponding to the inside of the foot, such that the entirety of the inside region of the foot smoothly moves.
- a difference in hardness between the first and second soft portions and the hard portion is great, or a separation distance between the first soft portion and the second soft portion is small, there is concern that the region of the arch portion will collapse.
- the arch shank rigidly supports the arch portion of the foot, thereby allowing the arch portion to smoothly perform inherent functions of distributing weight and absorbing impact.
- an arch shank 17a may be formed in a region of the arch portion which corresponds to the foot arch region that is concavely depressed inward, unlike FIG. 4A .
- the arch shank 17a may be made of thermoplastic polyurethane (TPU).
- TPU thermoplastic polyurethane
- FIGS. 5A and 5B are cross-sectional views taken along line B-B, which illustrate a fourth exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee.
- the midsole of the present invention may be configured to be stacked on an outsole 20 as illustrated in FIG. 5A , or may be configured to be inserted into an outsole 20a having a bottom portion 21 and a side wall portion 22 as illustrated in FIG. 5B .
- the first soft portion was disposed at the front side
- the second soft portion was disposed at the rear side
- the hard portion was disposed in the remaining region except for the first and second soft portions.
- the midsole was manufactured by joining the first and second soft portions and the hard portion.
- the first and second soft portions were made of soft EVA
- the hard portion was made of hard EVA
- a hardness ratio of the soft portion to the hard portion was 1:1.2.
- a midsole was manufactured by the same method as in Example 1, except that the hardness ratio of the soft portion to the hard portion was 1:1.3.
- a midsole was not divided into the first and second soft portions and the hard portion, and the midsole was manufactured by injection-molding hard EVA, which is identical in hardness to the hard EVA of the hard portion of Example 1.
- FIG. 6 is a graph illustrating measured values of medial contact force with respect to a stance phase in Examples 1 and 2 and Comparative Example 1.
- the midsole according to the present invention has advantages in that the medial contact force applied to the inside of the foot (shoe) is reduced such that an ankle joint may smoothly move, and movement of adduction applied to the inner knee is minimized, and ultimately, it is possible to prevent cartilage in the knee from being damaged.
- a midsole was manufactured by the same method as in Example 1, except that cross sections, which are inclined at 45°, were formed at the first and second soft portions and the hard portion, and then joined together.
- the inclined cross section of the hard portion was disposed over the inclined cross sections of the soft portions.
- Example 3 an arch shank, which was obtained by injection-molding thermoplastic polyurethane (TPU), was joined to a lower surface of the hard portion. In this case, the arch shank was laterally disposed on the arch portion including the foot arch.
- TPU thermoplastic polyurethane
- a level of wearing comfort is high in Examples 1 to 4, and particularly, a level of wearing comfort is significantly high in Examples 3 and 4 in which the inclined surfaces are formed at boundaries between the soft portions and the hard portion, and a level of wearing comfort is highest in Example 4 in which the arch shank is provided.
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- Materials Engineering (AREA)
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- Epidemiology (AREA)
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Description
- The present invention relates to a midsole which reduces a load applied to a knee, and more particularly, to a midsole which reduces a load applied to a knee, in which a first soft portion and a second soft portion are disposed at a front inner side and a rear inner side so as to allow an inner knee to relatively and smoothly move, thereby reducing impact and load concentrated on an inner knee joint, and expecting improved exercise capacity.
- Recently, with a rise in living standard and customer's various needs, a number of types of shoes having various designs are being manufactured, and special shoes having various functions are also being released on the market.
- As illustrated in
FIG. 7 , ashoe 1, which is generally used, mainly includes a sole 2, and an upper 3 coupled to an upper portion of the sole 2. Thesole 2 includes anoutsole 2a which is a bottom sole of the shoe, and amidsole 2b which is an intermediate sole of the shoe. Theoutsole 2a is made of a rubber material so as to endure wear resistance and a function of preventing sliding, and themidsole 2b is often made of a foamed and expanded synthetic resin material so as to form thelightweight shoe 1 by reducing the overall weight of theshoe 1, absorb impact when impact is applied to theshoe 1, and provide restoring force. - Meanwhile, in the case of outdoor-type shoes, instead of existing traditional outdoor-type shoes such as MID-CUT or HI-CUT style shoes, products which are light and excellent in cushioning and wearing comfort are being developed. However, in the case of hiking boots, cushioning property and wearing comfort are emphasized because hiking causes more injury factors than other sports, but recently developed hiking boots rather increases a risk of injuries and are not helpful enough to improve exercise capacity.
- According to the report published by the American Podiatric Medical Association, three-fourths of Americans suffer from chronic foot problems, and medical treatment for the foot problems is treated at least 55,000,000 times or more every year. However, the shocking thing is that most of the foot problems are caused by the shoes. The shoes change bone structures of the feet, and result in pain in the knee and the waist. In the case of Korea, according to the result of analysis of data of medical consultation fees by the national health insurance, for five years from 2005 to 2009, from the Policy Institute of the National Health Insurance Service, the fees for treatment for acquired injuries caused by shoes have increased as much as 77%. In particular, in the case of hiking that Korean enjoys, because hiking requires a larger amount of exercise and causes more risks of injuries than any other sports, injury prevention systems need to be sufficiently adopted to the shoes.
- In particular, in the case of injuries associated with knee joints, the number of female patients was 36,000 (in 2009), and is seven times more than the number of male patients. When analyzing the progress of patients per 100,000 people, the number of male patients of all ages consistently increased over the past five years, while the number of female patients in their thirties or less and seventies or more slowly increased, and the number of female patients in their forties to sixties rapidly increased.
- The number of patients per 100,000 people by regional groups is 108.2 in Seoul, 97.1 in Busan, and 97.0 in Jeollabuk-do in order of decreasing number, and the number of patients is higher in big cities.
- It can be seen from the aforementioned results that men and women all choose shoes in consideration of style and design of the shoes instead of stability of the shoes, which causes the acquired injuries to the bones of the foot.
- Impact is absorbed and thrusting force is created during a process in which a person steps on the ground from the heel to the big toe in accordance with movement of the foot, but in the case of the patients with injuries to the knee, particularly, arthritic patients, movement of adduction applied to an inner knee is increased, which causes damage to inner cartilages.
- Therefore, it is required to develop shoes having a structure capable of protecting ankle joints and knee joints, and particularly, it is required to develop the midsole.
- Meanwhile,
FIG. 8 is a perspective view illustrating a midsole in the related art. Referring toFIG. 8 , Korean Patent No.10-1075172 flex 1, aheel portion 2, and aheel cap 3 formed by joining three pieces having different hardness, and the midsole is configured to distribute and absorb impact and load directly applied to a lower side of a heel of a foot, and allow a user to conveniently walk. - However, the aforementioned Korean Patent is excellent in terms of a function of absorbing impact, but does not present a technical configuration regarding a structure for reducing impact and load concentrated on the knee joints in consideration of movement characteristics of the knee joints.
- Korean Patent Application Laid-Open No.
10-2000-0017890 10-1075172 (October 19, 2011 US 2006/0137228 A1 andUS 2012/0233877 A1 . - The midsole described in
US 2006/0137228 A1 comprises four parts to form the whole midsole. There exist a lower midsole body which comprises a front part and a rear part that are formed with soft material, while these parts are separated by a middle reinforcing member constructed of hard material like ABS, FRP (Fiber Reinforced Plastic) or similar materials. As the front part as well as the rear part of the lower midsole body is manufactured over their whole surface by the same soft material, this arrangement does not show the flexibility and comfort and conveniences to adapt the front part and the rear part of the midsole to areas of harder material and soft material, which allows a better support of the foot where it is necessary. For example the outer instep of the foot may be supported by harder material like the area of the ball of the foot. - Similar disadvantages can be seen by the midsole of
US 2012/0233877 A1 , as there too is shown a front and a heel portion which both are manufactured over their whole surface by soft material, while in the middle part of the midsole a firmer midfood element is placed. - The invention relates to a midsole as specified in
claim 1. Preferred embodiments are specified in the dependent claims. - The present invention has been made in an effort to provide a midsole, in which a first soft portion and a second soft portion are disposed at a front inner side and a rear inner side so as to allow an inner knee to relatively and smoothly move, thereby reducing impact and load concentrated on an inner knee joint, and expecting improved exercise capacity.
- The present invention has also been made in an effort to provide a midsole which reduces a load applied to a knee, in which inclined surfaces are formed at a soft portion and a hard portion, and the inclined surfaces are joined together, thereby minimizing inconvenience caused by a difference in hardness.
- The present invention has also been made in an effort to provide a midsole which reduces a load applied to a knee, in which an arch shank, which has greater hardness than a hard portion, is formed at an arch portion, thereby improving functions of distributing and absorbing impact using elastic actions of an arch and a foot arch.
- An exemplary embodiment of the present invention provides a midsole which reduces a load applied to a knee, the midsole including: a first soft portion which is formed at a front inner side based on an arch portion of a foot; a second soft portion which is formed at a rear inner side based on the arch portion of the foot; and a hard portion which is formed in the remaining region except for the first and second soft portions and in a region of the arch portion of the foot, and has greater hardness than the first and second soft portions,
the first soft portion is formed at the front inner side,
the second soft portion is formed at the rear inner side,
the first soft portion and the second soft portion are spaced apart from each other in a forward and rearward direction based on a foot arch region and formed in an inner region of the foot, and
the hard portion is formed at the arch portion of the foot and at a front outer side and a rear outer side of the arch portion. - The first soft portion and the second soft portion may have the same hardness.
- A hardness ratio of the soft portion to the hard portion may be 1:1.1 to 1.6.
- The soft portion and the hard portion may be joined together while being in direct contact with each other.
- The soft portion and the hard portion may have inclined cross sections that are vertically joined together, respectively, and a value of hardness in a region where the soft portion and the hard portion are joined together may be between a value of hardness of the soft portions and a value of hardness of the hard portion.
- An arch shank, which has greater hardness than the hard portion, may be installed in a region of the hard portion which corresponds to the arch portion of the foot.
- The arch shank may be installed in a foot arch region between the first soft portion and the second soft portion.
- The midsole may be configured to be inserted into an outsole having a bottom portion and a side wall portion.
- According to the midsole according to the present invention which reduces a load applied to a knee, the first soft portion and the second soft portion are disposed at the front inner side and the rear inner side so as to allow an inner knee to relatively and smoothly move, thereby reducing impact and load concentrated on an inner knee joint, and expecting improved exercise capacity.
- According to the midsole according to the present invention which reduces a load applied to a knee, the inclined surfaces are formed at the soft portion and the hard portion, and the inclined surfaces are joined together, thereby minimizing inconvenience caused by a difference in hardness.
- According to the midsole according to the present invention which reduces a load applied to a knee, the arch shank, which has greater hardness than the hard portion, is formed at the arch portion, thereby improving functions of distributing and absorbing impact using elastic actions of the arch and the foot arch and reducing a load applied to a knee.
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FIG. 1 is a top plan view illustrating a first exemplary embodiment of a midsole according to the present invention which reduces a load applied to a knee. -
FIG. 2 is a cross-sectional view illustrating a second exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee. -
FIG. 3 is a cross-sectional view illustrating the second exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee. -
FIGS. 4A and4B are cross-sectional views taken along line B-B, which illustrate a third exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee. -
FIGS. 5A and 5B are cross-sectional views taken along line B-B, which illustrate a fourth exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee. -
FIG. 6 is a graph illustrating measured values of medial contact force with respect to a stance phase in Examples 1 and 2 and Comparative Example 1. -
FIG. 7 is a view illustrating a structure of a shoe in the related art. -
FIG. 8 is a perspective view illustrating a midsole in the related art. - Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
- In the description of the present invention, the specific descriptions of publicly known related functions or configurations will be omitted when it is determined that the specific descriptions may unnecessarily obscure the subject matter of the present invention. In addition, the terms used in the description are defined considering the functions of the present invention and may vary depending on the intention of a user or an operator or precedents. Therefore, the definitions should be made based on the entire contents of the present specification.
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FIG. 1 is a top plan view illustrating a first exemplary embodiment of a midsole according to the present invention which reduces a load applied to a knee, andFIG. 2 is a cross-sectional view taken along line A-A, which illustrates a second exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee. - Referring to
FIGS. 1 and2 , amidsole 10 according to the present invention, which reduces a load applied to a knee, mainly includes a firstsoft portion 11, a secondsoft portion 13, and ahard portion 15, and is disposed between an outsole and an insole of a shoe. - Specifically, the
midsole 10 according to the present invention, which reduces a load applied to the knee, may include the firstsoft portion 11 which is formed at a front inner side based on an arch portion of a foot, the secondsoft portion 13 which is formed at a rear inner side based on the arch portion of the foot, and thehard portion 15 which is formed in the remaining region except for the first and secondsoft portions soft portions - The first
soft portion 11 and the secondsoft portion 13 are spaced apart from each other in a forward and rearward direction based on a foot arch region, and formed in an inner region of the foot. - The first
soft portion 11 is formed in a front inner side region including a big toe portion, and serves to allow the big toe, which creates thrusting force when a user walks or runs, to smoothly move. - The second
soft portion 13 is formed in a rear inner side region including an inner side of a heel, and serves to absorb load or impact when the user steps on the ground, and to allow the knee to smoothly move. - Both of the first
soft portion 11 and the secondsoft portion 13 may be made of the same material, for example, ethylene-vinyl acetate, and may have the same hardness. However, the first soft portion and the second soft portion may be made of different materials as long as the first soft portion and the second soft portion have the same hardness. - The
hard portion 15 is formed at the arch portion of the foot and at a front outer side and a rear outer side of the arch portion, and is harder than the soft portion, and has greater hardness than the soft portion. - A hardness ratio of the soft portion to the hard portion may be 1:1.1 to 1.6.
- The reason is that in a case in which a hardness ratio is lower than the aforementioned range, for example, in a case in which a hardness ratio of the second soft portion to the hard portion is lower than 1:1.1, there is a relatively little difference in hardness, and as a result, the second soft portion may not sufficiently serve to protect the knee.
- In a case in which a hardness ratio is higher than the aforementioned range, for example, in a case in which a hardness ratio of the second soft portion to the hard portion is higher than 1:1.6, wearing comfort deteriorates due to a difference in hardness, and there is a risk that an ankle portion will be injured when the user steps on the ground. Accordingly, the hardness ratio may be within the aforementioned range.
-
FIG. 3 is a cross-sectional view taken along line A-A, which illustrates the second exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee. - Referring to
FIG. 3 , in the present exemplary embodiment, thesoft portions hard portion 15 are joined together while being in direct contact with each other, and may be configured to haveinclined cross sections - As illustrated, the
inclined cross sections soft portions inclined cross sections hard portion 15, and vice versa. - The reason why the inclined cross sections are formed at the soft portions and the hard portion and then the inclined cross sections are joined together, as described above, is to prevent heterogeneity caused by a difference in hardness between the soft portions and the hard portion, and minimize deterioration in wearing comfort.
- That is, the aforementioned configuration allows boundaries between the soft portions and the hard portion to have intermediate hardness values, and serves to prevent the hardness from being rapidly changed in a stepwise manner.
-
FIGS. 4A and4B are cross-sectional views taken along line B-B, which illustrate a third exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee. - Referring to
FIG. 4A , in the present exemplary embodiment, anarch shank 17, which has greater hardness than thehard portion 15, may be installed in a region of thehard portion 15 which corresponds to the arch portion of the foot, and for example, thearch shank 17 may be joined to a bottom of the hard portion. - The
arch shank 17 serves to more rigidly support the arch portion of the foot. - In the present invention, the first soft portion and the second soft portion are disposed in a region corresponding to the inside of the foot, such that the entirety of the inside region of the foot smoothly moves. However, in a case in which a difference in hardness between the first and second soft portions and the hard portion is great, or a separation distance between the first soft portion and the second soft portion is small, there is concern that the region of the arch portion will collapse. In this case, the arch shank rigidly supports the arch portion of the foot, thereby allowing the arch portion to smoothly perform inherent functions of distributing weight and absorbing impact.
- Referring to
FIG. 4B , anarch shank 17a may be formed in a region of the arch portion which corresponds to the foot arch region that is concavely depressed inward, unlikeFIG. 4A . - For example, the
arch shank 17a may be made of thermoplastic polyurethane (TPU). -
FIGS. 5A and 5B are cross-sectional views taken along line B-B, which illustrate a fourth exemplary embodiment of the midsole according to the present invention which reduces a load applied to the knee. - The midsole of the present invention may be configured to be stacked on an
outsole 20 as illustrated inFIG. 5A , or may be configured to be inserted into anoutsole 20a having abottom portion 21 and aside wall portion 22 as illustrated inFIG. 5B . - Hereinafter, Examples of the midsole according to the present invention which reduces a load applied to the knee will be described in detail.
- Based on the foot arch inside the arch portion of the foot, the first soft portion was disposed at the front side, the second soft portion was disposed at the rear side, and the hard portion was disposed in the remaining region except for the first and second soft portions. Further, the midsole was manufactured by joining the first and second soft portions and the hard portion.
- In this case, the first and second soft portions were made of soft EVA, the hard portion was made of hard EVA, and a hardness ratio of the soft portion to the hard portion was 1:1.2.
- A midsole was manufactured by the same method as in Example 1, except that the hardness ratio of the soft portion to the hard portion was 1:1.3.
- Unlike Example 1, a midsole was not divided into the first and second soft portions and the hard portion, and the midsole was manufactured by injection-molding hard EVA, which is identical in hardness to the hard EVA of the hard portion of Example 1.
- Meanwhile, shoes were manufactured using the midsoles of Examples 1 and 2 and Comparative Example 1, force (medial contact force), which is applied to the inside of the shoe from a moment when the shoe comes into contact with the ground (stance phase: 0%) to a moment when the shoe is lifted off the ground (stance phase: 100%), was measured, and the results were illustrated as a graph in
FIG. 6 . -
FIG. 6 is a graph illustrating measured values of medial contact force with respect to a stance phase in Examples 1 and 2 and Comparative Example 1. - Referring to
FIG. 6 , it can be confirmed that in the case of Examples 1 and 2, compared to the case of Comparative Example 1, the medial contact force is rapidly decreased in a region of 20% of the stance phase where the largest amount of load is applied to the heel and in a region of 70% of the stance phase where thrusting force is created by the big toe. - As described above, the midsole according to the present invention has advantages in that the medial contact force applied to the inside of the foot (shoe) is reduced such that an ankle joint may smoothly move, and movement of adduction applied to the inner knee is minimized, and ultimately, it is possible to prevent cartilage in the knee from being damaged.
- A midsole was manufactured by the same method as in Example 1, except that cross sections, which are inclined at 45°, were formed at the first and second soft portions and the hard portion, and then joined together.
- In this case, the inclined cross section of the hard portion was disposed over the inclined cross sections of the soft portions.
- In Example 3, an arch shank, which was obtained by injection-molding thermoplastic polyurethane (TPU), was joined to a lower surface of the hard portion. In this case, the arch shank was laterally disposed on the arch portion including the foot arch.
- In order to find out wearing comfort of the shoes that are manufactured using the midsoles of Examples 1 to 4, sensory tests were carried out on 100 people (fifty were male and fifty were female).
- In the sensory tests, people wore the corresponding shoes and walked around for one hour, and thereafter, estimated wearing comfort of the respective shoes.
- Reference of the sensory test: wearing comfort was estimated in accordance with a seven-point scale in which "1" means "very bad", "2" means "bad", "3" means "not good", "4" means "fair", "5" means "slightly good", "6" means "good", and "7" means "very good", and average values of the result values are shown in the following table.
[Table 1] Division Wearing Comfort Example 1 5.9 Example 2 6.0 Example 3 6.5 Example 4 6.7 - As shown in Table 1, it can be seen that a level of wearing comfort is high in Examples 1 to 4, and particularly, a level of wearing comfort is significantly high in Examples 3 and 4 in which the inclined surfaces are formed at boundaries between the soft portions and the hard portion, and a level of wearing comfort is highest in Example 4 in which the arch shank is provided.
Claims (6)
- A midsole which reduces a load applied to a knee, the midsole (10) comprising:a) a first soft portion (11) which is formed at a front side based on an arch portion of a foot;b) a second soft portion (13) which is formed at a rear side based on the arch portion of the foot; andc) a hard portion (15) which is formed in a region of the arch portion of the foot, and has greater hardness than the first (11) and second (13) soft portions,d1) the first soft portion (11) and the second soft portion (13) are spaced apart from each other in a forward and rearward direction based on a foot arch region, whereind2) the first soft portion (11) and the second soft portion (13) are formed in an inner region of the foot,e) the hard portion (15) is formed at the arch portion of the foot and at a front outer side and a rear outer side of the arch portion and in the remaining region except for the first and second soft portions (11, 13),f) the first soft portion (11) is formed at the front inner side and in the front inner side region including a big toe portion,g) the second soft portion (13) is formed at the rear inner side and in the rear inner side region including an inner side of a heel,h) the soft portion (11, 13) and the hard portion (15) have inclined cross sections (11a, 13a, 15a, 15b) that are vertically joined together, respectively, andi) a value of hardness in a region where the soft portion (11, 13) and the hard portion (15) are joined together is between a value of hardness of the soft portions and a value of hardness of the hard portion, andj) an arch shank (17), which has greater hardness than the hard portion (15), is installed in a region of the hard portion (15) which corresponds to the arch portion of the foot.
- Midsole according to claim 1,
characterized in that
the first soft portion (11) and the second soft portion (13) have the same hardness. - Midsole according to anyone of the claims 1 to 2,
characterized in that
a hardness ratio of the soft portion to the hard portion is 1:1.1 to 1.6. - The midsole of claim 1,
characterized in that
the soft portion (11, 13) and the hard portion (15) are joined together while being in direct contact with each other. - Midsole according to anyone of the claims 1 to 4,
characterized in that
the arch shank (17) is installed in a foot arch region between the first soft portion (11) and the second soft portion (13). - Midsole according to anyone of the claims 1 to 5,
characterized in that
the midsole is configured to be inserted into an outsole (20, 20a) having a bottom portion (21) and a side wall portion (22).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020140051293A KR101423025B1 (en) | 2014-04-29 | 2014-04-29 | Midsole reducing the load on the knee |
Publications (2)
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EP2939558A1 EP2939558A1 (en) | 2015-11-04 |
EP2939558B1 true EP2939558B1 (en) | 2018-11-07 |
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EP15152468.3A Not-in-force EP2939558B1 (en) | 2014-04-29 | 2015-01-26 | Midsole for reducing load applied on knee |
Country Status (4)
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US (1) | US20150305437A1 (en) |
EP (1) | EP2939558B1 (en) |
KR (1) | KR101423025B1 (en) |
CN (1) | CN105011464A (en) |
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DE102012206094B4 (en) | 2012-04-13 | 2019-12-05 | Adidas Ag | Soles for sports footwear, shoes and method of making a shoe sole |
US9610746B2 (en) | 2013-02-13 | 2017-04-04 | Adidas Ag | Methods for manufacturing cushioning elements for sports apparel |
DE102013202306B4 (en) | 2013-02-13 | 2014-12-18 | Adidas Ag | Sole for a shoe |
DE102013002519B4 (en) | 2013-02-13 | 2016-08-18 | Adidas Ag | Production method for damping elements for sportswear |
US9930928B2 (en) | 2013-02-13 | 2018-04-03 | Adidas Ag | Sole for a shoe |
DE102013202291B4 (en) | 2013-02-13 | 2020-06-18 | Adidas Ag | Damping element for sportswear and shoes with such a damping element |
USD776410S1 (en) | 2013-04-12 | 2017-01-17 | Adidas Ag | Shoe |
USD740004S1 (en) | 2013-04-12 | 2015-10-06 | Adidas Ag | Shoe |
DE102014215897B4 (en) * | 2014-08-11 | 2016-12-22 | Adidas Ag | adistar boost |
DE102014216115B4 (en) | 2014-08-13 | 2022-03-31 | Adidas Ag | 3D elements cast together |
JP6679363B2 (en) | 2015-03-23 | 2020-04-15 | アディダス アーゲー | Soles and shoes |
DE102015206486B4 (en) | 2015-04-10 | 2023-06-01 | Adidas Ag | Shoe, in particular sports shoe, and method for manufacturing the same |
DE102015206900B4 (en) | 2015-04-16 | 2023-07-27 | Adidas Ag | sports shoe |
DE102015209795B4 (en) | 2015-05-28 | 2024-03-21 | Adidas Ag | Ball and process for its production |
USD783264S1 (en) | 2015-09-15 | 2017-04-11 | Adidas Ag | Shoe |
USD840137S1 (en) | 2016-08-03 | 2019-02-12 | Adidas Ag | Shoe midsole |
USD840136S1 (en) | 2016-08-03 | 2019-02-12 | Adidas Ag | Shoe midsole |
USD852475S1 (en) | 2016-08-17 | 2019-07-02 | Adidas Ag | Shoe |
JP1582717S (en) | 2016-09-02 | 2017-07-31 | ||
US20240156210A9 (en) * | 2017-01-06 | 2024-05-16 | Under Armour, Inc. | Components for articles and methods of making components from embroidered beads |
CN106954914A (en) * | 2017-04-25 | 2017-07-18 | 福建起步儿童用品有限公司 | Multifunctional children's insole |
CN107028288A (en) * | 2017-04-25 | 2017-08-11 | 福建起步儿童用品有限公司 | Production method of foot protection insole for children |
USD899061S1 (en) | 2017-10-05 | 2020-10-20 | Adidas Ag | Shoe |
CN115177071A (en) * | 2017-10-23 | 2022-10-14 | 耐克创新有限合伙公司 | Sole structure for an article of footwear |
US20210137216A1 (en) * | 2019-11-07 | 2021-05-13 | Arthur Robert Taylor | Shoe sole or insert of a unitary material having a gradual change in hardnesses and/or density characteristics and a method of making the same |
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KR101075172B1 (en) * | 2011-03-04 | 2011-10-19 | 주식회사 블랙야크 | Shoe midsole consisting of three parts with different hardness |
KR20130017448A (en) * | 2011-08-10 | 2013-02-20 | 주식회사 신경 | Foamed aticles for mid-sole, mdd-sole comprising it and method thereof |
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KR20000017890A (en) | 1999-12-28 | 2000-04-06 | 임성조 | base plate of shoe having in outsole and midsole which inner and outer part are different hardness and thereby manufacturing method |
US6598319B2 (en) * | 2001-01-17 | 2003-07-29 | Spenco Medical Corporation | Insole with rebounding and cushioning areas and adjustable arch support |
CN100438791C (en) * | 2003-10-17 | 2008-12-03 | 株式会社爱世克私 | Sole with reinforcement structure |
FI117541B (en) * | 2005-07-01 | 2006-11-30 | Karhu Sporting Goods Oy | The sole structure of the sports shoe |
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KR101008344B1 (en) * | 2010-06-15 | 2011-01-13 | 임옥순 | Footwear with sole which is divided into two parts |
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US20130074366A1 (en) * | 2011-09-23 | 2013-03-28 | Torng-Haur Yeh | Compound structure of mid-sole and insole |
US8567098B2 (en) * | 2013-03-19 | 2013-10-29 | Henry Hsu | Article of footwear with detachable upper and lower designs |
-
2014
- 2014-04-29 KR KR1020140051293A patent/KR101423025B1/en active IP Right Grant
-
2015
- 2015-01-26 EP EP15152468.3A patent/EP2939558B1/en not_active Not-in-force
- 2015-04-21 US US14/691,875 patent/US20150305437A1/en not_active Abandoned
- 2015-04-29 CN CN201510214241.0A patent/CN105011464A/en active Pending
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KR101075172B1 (en) * | 2011-03-04 | 2011-10-19 | 주식회사 블랙야크 | Shoe midsole consisting of three parts with different hardness |
KR20130017448A (en) * | 2011-08-10 | 2013-02-20 | 주식회사 신경 | Foamed aticles for mid-sole, mdd-sole comprising it and method thereof |
Also Published As
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CN105011464A (en) | 2015-11-04 |
US20150305437A1 (en) | 2015-10-29 |
KR101423025B1 (en) | 2014-07-29 |
EP2939558A1 (en) | 2015-11-04 |
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