EP2299949B1 - Shoe sole element for stabilization - Google Patents
Shoe sole element for stabilization Download PDFInfo
- Publication number
- EP2299949B1 EP2299949B1 EP09770567.7A EP09770567A EP2299949B1 EP 2299949 B1 EP2299949 B1 EP 2299949B1 EP 09770567 A EP09770567 A EP 09770567A EP 2299949 B1 EP2299949 B1 EP 2299949B1
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- European Patent Office
- Prior art keywords
- shoe
- stabilizing device
- medial
- stiffness
- extended
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Classifications
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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
- A43B7/24—Insertions or other supports preventing the foot canting to one side , preventing supination or pronation
Description
- This invention relates generally to a stabilizing element for a shoe, and a shoe containing said stabilizing device and, more specifically, to a stabilizing device for controlling the rolling motion of a wearer's foot over a foot strike path.
- The complex motions of the foot that can occur during a gait cycle of a wearer have been the focus of a multitude of biomechanical studies with a goal toward injury prevention and generally improved walking and running performance shoes. In particular, it has been an objective in the design of modern athletic shoes to provide support and cushioning where needed over a typical gait cycle. Typically, cushioning is provided in areas of a midsole of a shoe under the heel region to help minimize the impact of initial heel strike. Additional support elements are also typically provided to reduce excessive rolling of the foot toward the inner (medial) side or outer (lateral) side during a gait cycle by appropriate positioning of stiffening materials and structures.
- The tendency to roll toward the medial side after initial heel impact, or pronation, is a normal movement of the foot that occurs during walking or running. Immediately following the initial heel strike, the joint between the foot bones called the subtalar joint is unlocked, allowing pronation, a coordinated triplane motion of the foot, to occur during the forefoot lowering events of the loading period of the so-called stance phase. The triplane motions are: (1) abduction, in which the front of the foot is turned outwards at the subtalar joint and away from the line of progression of the wearer; (2) dorsiflexion, in which the front of the foot is angled upwards relative to the heel of the foot at the ankle, or talocrural joint; and (3) eversion, in which the sole of the foot is turned outward relative to the heel of the foot at the subtalar joint. With this coordinated combination of three planes of motions, the foot typically rolls from the lateral side toward the medial side of the foot as the medial aspect of the midfoot area of the foot comes into contact with the running surface. This triplane rolling of the foot as the wearer's body weight begins to move forward allows the foot to transfer some of the loading force to the waling or running surface. The foot remains in a pronated position throughout the mid-stance phase.
- Supination typically follows pronation. As one's body weight moves forward over the foot, the subtalar joint locks and a reversal of the events that occurred during the loading period occurs. Supination involves the motions of: (1) adduction, in which the locking of the subtalar joint allows the foot to turn inward toward the line of progression; (2) plantarflex, in which the forefoot is flexed downward relative to the heel at the ankle; and (3) inversion, in which the sole of the foot is turned inward at the subtalar joint relative to the heel. With the combination of these three motions, the foot continues rolling forward onto the toes. During motion through ball and toe contact, the foot rolls outward just before the toes start to leave the ground. The combination of these motions allows the foot to be converted from a mobile adaptor to a rigid lever, which is essential for the forward propulsion of the body.
- Though pronation and supination are natural motions, both excessive pronation, often caused by high pronation velocity, and excessive supination are undesirable and can lead to injury. Various approaches have been used in footwear design to control these rotational motions to avoid injury. Traditional so-called medial "post" or "posting" systems typically use a firmer density of ethylene vinyl acetate ("EVA") or polyurethane ("PU") foam on the medial side of a shoe in a rearfoot portion of a midsole to control pronation. However, it is difficult to control the density and hardness of such foams. For example, manufactured foams are often softer than specified in production. In addition, it takes more time and costs more to make the denser EVA foams. Such medial posts often use two densities of foam in a wedged configuration to provide a smoother transition for the foot as it rolls from heel to toe. However, both the relative density and thickness of these foams are difficult to control during manufacturing, and the positioning of a wedge of rigid foam over a softer foam does not provide a truly continuous transition of stiffness from heel strike to toe-off.
- Prior devices address motion control primarily by altering compression resistance underneath the foot using discrete rigid posts and plates or dual density midsole foams. The prior devices provide little or no transition of compression resistance. In addition, such transition is offered only under the foot and in only one direction-transverse to the longitudinal axis of the shoe. None of the prior devices discloses or suggests a device for precisely and smoothly controlling the motion of the foot along a foot strike path or providing a continuous transition in compression resistance as the foot traverses a strike path.
- Accordingly, there is a need, which has not been adequately addressed in the prior art, for a device for precisely and smoothly controlling the motion of a foot along a foot strike path and that also provides a continuous and smooth transition in compression resistance along the foot strike path.
US4854055 describes a sports shoe, provided with a heel counter comprising a heel side wall part having a curved shape, a folded wall part integrally formed along the edge of the heel side wall part as projected inside the curve, and a stationary plate part integrally formed on the side of the heel side wall part opposite to the edge, the heel side lateral wall having one of the lateral wall parts thereof formed as extended farther forward than the other lateral wall part of the heel side wall part on the arch side of foot and the folded wall part being nipped between the upper of the sports shoe and the sold thereof.
US6401366 describes an article of footwear having an upper secured to a longitudinal sole with a frame preferably having a stabilizing band extending between axially decoupled heel and opposite forefoot portions of the sole. The band has a central portion extending above the heel and forefoot portions of the sole and adjacent to an upper such that the forefoot and heel portions of the sole may axially pivot about a longitudinal axis parallel to and above the longitudinal axis of the heel and forefoot portions while resisting deflection in a direction perpendicular to the longitudinal length of the sole, thereby supporting a foot along its entire longitudinal length while permitting the article of footwear to conform with the axial movements of an athlete's foot while running.US484397 discloses a stabilization device for controlling the degree of roll of a running shoe which includes at least upper and lower laminar sole elements including an upper plate superposed on and substantially conforming to the top surface of the upper sole element, a lower plate spaced from said and interposed between the upper and lower sole elements and a side wall extending between and connected to the upper and lower plates and substantially conforming to the side of the upper sole element. - The present invention is set out in the
independent claims 1 and 15. A stabilizing device of the present invention addresses the deficiencies of the prior art by precisely and smoothly controlling the motion of the foot along a foot strike path by providing a continuous variation in stiffness along a medial or lateral side of a wearer's foot. A shoe sole and a shoe which include the stabilizing device are also formed in accordance with the present invention. According to the invention, a stabilizing device for use in a shoe sole is defined inclaim 1. In one embodiment, the stiffness of the sidewall portion decreases continuously from the first end toward the second end. In another embodiment, the stiffness of the sidewall portion increases continuously from the first end toward the second end. In another embodiment the cross-sectional area formed from the sidewall portion and the elongated portion varies continuously from the first end toward the second end. In accordance with this embodiment, the cross-sectional area can also decrease continuously from the first end toward the second end. In another embodiment, the cross-sectional area increases continuously from the first end toward the second end. - In a further embodiment, a stiffness of the elongated portion varies continuously from the first end toward the second end. In accordance with this embodiment, the stiffness of the elongated portion can also decrease continuously from the first end toward the second end. In another embodiment, the stiffness of the elongated portion increases continuously from the first end toward the second end.
- In still another embodiment, the stabilizing device is adapted to extend from either the medial or lateral side of the shoe across 20% to 35 % of the width of the shoe at the arch region.
- In one embodiment, the elongated portion has a surface adapted for being positioned flush with an upper surface of the shoe sole.
- In another embodiment, the sidewall portion has a lower portion that is adapted to extend from the elongated portion towards a ground engaging surface of the shoe. In accordance with this embodiment, a lower extension portion can also extend transversely from an end of the lower portion of the sidewall portion away from the elongated portion.
- The stabilizing device of the above embodiments may be integrally formed of a thermoplastic material. The thermoplastic material may be injection molded thermoplastic.
- In one embodiment, the stabilizing device of any of the above embodiments is adapted to be positioned along the medial side of the shoe. In another embodiment, the stabilizing device is adapted to be positioned along the lateral side of the shoe.
- The stabilizing device may further include an extended heel portion. The extended heel portion includes an extended elongated portion. The extended elongated portion is integrally connected to the elongated portion of the stabilizing device. The extended heel portion also includes an extended sidewall portion. The extended sidewall portion is integrally connected to the sidewall portion of the stabilizing device. The extended sidewall portion has a stiffness that varies continuously. The extended heel portion is adapted to extend from one the medial or later side of the shoe, around the heel end of the shoe, to the other of the medial or lateral side of the shoe.
- In one embodiment, the stiffness of at least one of the extended sidewall portion and the extended elongated portion increases continuously along the medial and lateral sides toward the rear of the extended heel portion. In another embodiment, the stiffness of at least one of the extended sidewall portion and the extended elongated portion decreases continuously along the medial and lateral sides toward the rear of the extended heel portion.
- A shoe formed in accordance with the present invention is defined in claim 15 and includes a stabilizing device according to
claim 1. The shoe has an upper and a shoe sole. The stabilizing device is disposed along either the medial or lateral side of the shoe sole. The stabilizing device has a first end and a second end. The first end is mounted in the rearfoot region of the shoe and the second end is mounted in the arch region of the shoe. The stabilizing device has an elongated portion positioned between the first end and the second end that extends along a periphery of the shoe sole from the rearfoot region into the arch region. The stabilizing device also has a sidewall portion that extends from the rearfoot region into the arch region. The sidewall portion extends transversely from the elongated portion. The sidewall portion forms a portion of a peripheral wall on either the medial or lateral side of the shoe. The sidewall portion has a stiffness that varies continuously from the first end toward the second end. - In one embodiment, the stiffness of the sidewall portion decreases continuously from the first end toward the second end. In another embodiment, the stiffness of the sidewall portion increases continuously from the first end toward the second end.
- In another embodiment the cross-sectional area formed from the sidewall portion and the elongated portion varies continuously from the first end toward the second end. In accordance with this embodiment, the cross-sectional area can decrease continuously from the first end to the second end. In another embodiment, the cross-section area increases continuously from the first end to the second end.
- In a further embodiment, a stiffness of the elongated portion varies continuously from the first end toward the second end. In accordance with this embodiment, the stiffness of the elongated portion can decrease continuously from the first end toward the second end. In another embodiment, the stiffness of the elongated portion increases continuously from the first end toward the second end.
- In still another embodiment, the stabilizing device extends from either the medial or lateral side of the shoe across 20% to 35 % of the width of the shoe at the arch region.
- In one embodiment, the elongated portion has a surface positioned flush with an upper surface of the shoe sole.
- In another embodiment, the sidewall portion has a lower portion that extends from the elongated portion towards a ground engaging surface of the shoe. In accordance with this embodiment, a lower extension portion can also extend transversely towards the center of the shoe sole from an end of the lower portion away from the elongated portion.
- The stabilizing device of the above embodiments can be integrally formed of a thermoplastic material. The thermoplastic material can be injection molded thermoplastic.
- In one embodiment, the stabilizing device is positioned along the medial side of the shoe. In another embodiment, the stabilizing device is positioned along the lateral side of the shoe.
- The stabilizing device may further include an extended heel portion. The extended heel portion includes an extended elongated portion. The extended elongated portion is integrally connected to the elongated portion of the stabilizing device. The extended heel portion also includes an extended sidewall portion. The extended sidewall portion is integrally connected to the sidewall portion of the stabilizing device. The extended sidewall portion has a stiffness that varies continuously. The extended heel portion extends from one the medial or later side of the shoe, around the heel end of the shoe, to the other of the medial or lateral side of the shoe.
- In one embodiment, the stiffness of at least one of the extended sidewall portion and the extended elongated portion increases continuously along the medial and lateral sides toward the rear of the extended heel portion. In another embodiment, the stiffness of at least one of the extended sidewall portion and the extended elongated portion decreases continuously along the medial and lateral sides toward the rear of the extended heel portion.
- When positioned on a medial side of the shoe, the stabilizing device reduces pronation velocity of the subtalar joint by providing a precisely controlled stiffness that continuously decreases from the rearfoot region to the arch region along the longitudinal axis and on the medial side of the shoe. When positioned on a lateral side of the shoe, the stabilizing device reduces supination velocity of the subtalar joint by providing a precisely controlled stiffness that continuously decreases from the rearfoot region to the arch region along the longitudinal axis on the lateral side of the shoe.
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FIGS. 1A and1B are side views of the medial and lateral sides respectively of a skeleton of a human foot. -
FIG. 2 is a perspective view of an embodiment of a stabilizing device. -
FIG. 3 is a cross-sectional view of the stabilizing device ofFIG. 2 . -
FIG. 4 is a schematic top view of an embodiment of a shoe sole with the stabilizing device ofFIG. 2 positioned on a medial side of a shoe. -
FIG. 5 is a medial side view of the shoe sole and motion control device ofFIG. 4 . -
FIG. 6 is a cross-sectional view of the shoe sole and stabilizing device ofFIG. 4 . -
FIG. 7 is a medial side view of another embodiment of a shoe sole with another embodiment of a stabilizing device. -
FIG. 8 is a cross-sectional view of the shoe sole and motion control device ofFIG. 7 . -
FIG. 9 is a schematic top view of an embodiment not according to the invention of a shoe sole with an embodiment of a stabilizing device on the medial side and an embodiment of a stabilizing device on the lateral side. -
FIG. 10 is a schematic top view of an embodiment not according to the invention of a shoe sole with an embodiment of a stabilizing device with an extended heel portion. -
FIG. 11 is a schematic top view of an embodiment not according to the invention of a shoe sole with an emobidment of a stabilizing device with an extended heel portion. -
FIGS. 1A and1B show a medial and lateral side view, respectively, of the skeleton of ahuman foot 100. Theforefoot region 101 of a foot corresponds generally with the phalanges (toes) 102 and metatarsals 103. Therearfoot region 104 of the foot, also referred to as the heel region, corresponds generally to thecalcaneous bone 105. The arch region of the foot generally overlaps a portion of the forefoot including the metatarsals 103 (but not the phalanges 102) and encompasses thetarsals 107 in between thecalcaneous bone 105 and the metatatarsals 103. Referring toFIG. 1A , a medial longitudinalarch region 107 is formed between the medial tubercle ofcalcaneous 105 to the head of the first, second and third metatarsals 103-1, 103-2, 103-3. As shown inFIG. 1B , a longitudinalarch region 106 on the lateral side of thefoot 100 is formed generally between the lateral tubercle of thecalcaneous 105 to the head of the fourth 103-4 and fifth metatarsals 103-5. The regions of a shoe sole are generally divided into relative sections to correspond generally to these regions of the human foot, with the heel or rearfoot region of a shoe sole generally known as the area corresponding to thecalcaneous bone 105, and the forefoot region of a shoe sole corresponding to the area underlying at least thephalanges 102. The arch region of a shoe sole may be formed to encompass the entire anatomical arch of a foot, particularly for use in sports creating high stress on the arches of the foot. Herein, we refer to an arch region of a shoe sole as encompassing the area forward of the rearfoot region and including the metatarsals 103. - Referring to
FIGS. 2 and3 , an embodiment of a stabilizingdevice 201 for use in a shoe is made from a unitary piece of material, such as plastic. The stabilizingdevice 201 has afirst end 202 and asecond end 203 for mounting the device in a shoe. Thefirst end 202 is adapted for mounting in the rearfoot region of a shoe. Thesecond end 203 is adapted for mounting in the arch region of a shoe. The stabilizingdevice 201 includes anelongated portion 204 that is positioned between thefirst end 202 and thesecond end 203. In one embodiment, thefirst end 202 for mounting corresponds to an end of theelongated portion 204 and thesecond end 203 for mounting corresponds to the other end of theelongated portion 204. - The stabilizing
device 201 also includes asidewall portion 205 that extends transversely from theelongated portion 204 along the length of theelongated portion 204 and preferably beyond. Thesidewall portion 205 is adapted to form a portion of an outer peripheral wall on either the medial or lateral side of the shoe in which it is positioned. Thesidewall portion 205 has a stiffness that varies continuously from thefirst end 202 toward thesecond end 203. In one embodiment, the stiffness of thesidewall portion 205 decreases continuously from thefirst end 202 toward thesecond end 203. In another embodiment, the stiffness of thesidewall portion 205 increases continuously from thefirst end 202 toward thesecond end 203. - The
elongated portion 204 is adapted for mounting no further forward than the arch region of the shoe. By restricting theelongated portion 204 of the stabilizingdevice 201 to the arch and heel region, thephalanges 102 of thefoot 100 are allowed to flex while the wearer is walking or running, which assists in pushoff and enables more efficient movement. - In addition to varying the stiffness of the
sidewall portion 205, the stiffness of theelongated portion 204 can also be varied continuously from thefirst end 202 toward thesecond end 203. In one embodiment, the stiffness of theelongated portion 204 decreases continuously from thefirst end 202 toward thesecond end 203. In another embodiment, the stiffness of theelongated portion 204 increases continuously from thefirst end 202 toward thesecond end 203. - In order to control the stiffness of the
sidewall portion 205 and/or theelongated portion 204, the cross-sectional area formed from thesidewall portion 205 and theelongated portion 204 can be varied continuously from thefirst end 202 toward thesecond end 203. In one embodiment, this cross-sectional area decreases continuously from thefirst end 202 toward thesecond end 202. In another embodiment, this cross-section area increases continuously from thefirst end 202 toward thesecond end 203. - In another embodiment, the
sidewall portion 205 has alower portion 207 that is adapted to extend from theelongated portion 204 towards a ground engaging surface of the shoe. In yet another embodiment, as best shown inFIG. 3 , alower extension portion 208 extends preferably transversely along the length of the end of thelower portion 207 of thesidewall portion 205 away from theelongated portion 204. Thelower extension portion 208 is adapted to be mounted into or between two layers of the sole of the shoe. - The stabilizing
device 201 is adapted to be positioned along the medial side of the shoe or along the lateral side of the shoe. Referring toFIG. 4 , when positioned on a medial side of the shoe, the stabilizingdevice 201 reduces pronation velocity of the subtalar joint by providing a precisely controlled stiffness that continuously decreases from therearfoot region 224 to thearch region 226. In a different embodiment, the stabilizingdevice 201 can be positioned along the medial side of the shoe and formed so that its stiffness increases continuously from the rearfoot region to the arch region. When positioned on a lateral side of the shoe, the stabilizingdevice 201 reduces supination velocity of the subtalar joint by providing a precisely controlled stiffness that continuously increases from the rearfoot region to the arch region. In another embodiment, the stabilizingdevice 201 can be positioned along the lateral side of the shoe and formed with a stiffness that decreases continuously from therearfoot region 224 to thearch region 226. -
FIGS. 4 ,5 , and6 depict a shoe sole 200 containing the stabilizingdevice 201. A shoe formed in accordance with the present invention can include an upper and theshoe sole 200. The stabilizingdevice 201 is disposed along either the medial or lateral side of theshoe sole 200. Thefirst end 202 of the stabilizingdevice 201 is mounted in therearfoot region 104 of theshoe sole 200. Thesecond end 203 of stabilizingdevice 201 is mounted in thearch region 106 of theshoe sole 200. Thesidewall portion 205 of the stabilizingdevice 201 preferably forms a portion of aperipheral wall 209 on either the medial or lateral side of theshoe sole 200. In addition, theelongated portion 204 has anupper surface 206 that can be positioned flush with anupper surface 212 of theshoe sole 200. - In one embodiment, the
lower portion 207 of thesidewall portion 205 extends from theelongated portion 204 towards aground engaging surface 210 of theshoe sole 200. Alower extension portion 208 extends transversely from thelower portion 207. Thelower extension portion 208 can be mounted between two layers of theshoe sole 200, for example,ground engaging surface 210 andmidsole 211, as shown inFIG. 6 . - In one embodiment, shown in
FIG. 9 , a stabilizingdevice 201 adapted to be a medial device and a stabilizingdevice 201 adapted to be a lateral stabilizing device are positioned on the medial and lateral sides respectively in thesame shoe 200. - The
elongated portion 204 of the stabilizingdevice 201 extends along a periphery of theshoe 200 and extends from either the medial side or the lateral side of the shoe toward, but not past, the longitudinal centerline of the shoe. In other embodiments, the stabilizingdevice 201 also extends along the peripheral rear of the shoe, encompassing the heel (FIGS. 9-11 ). In one embodiment, the stabilizingdevice 201 extends from either the medial or lateral side of theshoe sole 200 across between 15% to 40% of the shoe sole 200 at the narrowest cross section of the sole 200. Most preferably, thedevice 201 extends across 20% to 35% of the width of the shoe sole 200 at the narrowest cross section of the sole 200. - One
end 202 of theelongated portion 204 is positioned in the rearfoot region of theshoe 200. In one embodiment, thefirst end 202 is adapted to be positioned in a portion of the sole situated below the talus bone of the wearer's foot. In another embodiment, thefirst end 202 is located a distance from therear end 216 of theshoe 200 that is between about 5% and 35% of the length of the shoe. Most preferably the distance is between about 10% and 20%. In another embodiment, the distance is between about 12% and 18%. - The
second end 203 is positioned in the arch region of theshoe 200. For a stabilizingdevice 201 located on a medial side of theshoe 200, thesecond end 203 is preferably located a distance from therear end 216 of theshoe 200 that is between about 50% and 80% of the length of the shoe. Most preferably, the distance is between about 60% to 75% of the length of the shoe. For a stabilizingdevice 201 located on the lateral side of theshoe 200, thesecond end 203 is preferably located a distance from therear end 216 of the shoe that is between about 50% and 80% of the length of theshoe 200. Most preferably the distance is between about 60% to 75% of the length of theshoe 200. -
FIGS. 7 and8 show an alternative embodiment of a stabilizingdevice 701 and a shoe sole 700 containing the stabilizingdevice 701. The stabilizingdevice 701 is made from a unitary piece of material, such as plastic. The stabilizingdevice 701 includes anelongated portion 704 that extends from afirst end 702 positioned in the rearfoot to asecond end 703 positioned in the arch region. The stabilizingdevice 701 also includes asidewall portion 705 that extends between thefirst end 702 and thesecond end 703. Thesidewall portion 705 extends transversely from theelongated portion 704 along the length of theelongated portion 704. Thesidewall portion 705 preferably forms a portion of an outerperipheral wall 709 on either the medial or lateral side of the shoe sole 700 in which it is positioned. The stiffness and cross-sectional area of thesidewall portion 705 andelongated portion 704 are varied as described above with respect toFIGS. 2-6 in accordance with at least one of the embodiments described. - As compared with the stabilizing
device 201 shown inFIG. 4 , thesidewall portion 705 of the stabilizingdevice 701 does not contain alower portion 207 or alower extension portion 208. The elimination of thelower portion 207 of thecontinuous sidewall 704 lessens the stiffening caused when thislower portion 207 is present and offers greater overall control of the stiffness profile of themotion control device 701. -
FIG. 10 shows an alternate embodiment of the stabilizing device of the present invention. The stabilizingdevice 301 includes anextended heel portion 213. Theextended heel portion 213 is integrally extended from a stabilizingdevice 201 positioned on at least one of a medial and lateral side. InFIG. 10 , the stabilizingdevice 301 includes both a medial and lateral stabilizingdevice 201, however a stabilizing device including anextended heel portion 213 connected to only one of a lateral or medial stabilizingdevice 201 is also contemplated. Theextended heel portion 213 is located in therearfoot region 224 of the sole and includes an extendedelongated portion 214 that is integrally connected to theelongated portion 204 of the stabilizingdevice 201. The elongated portions extend into thearch region 226. Theextended heel portion 213 also includes anextended sidewall portion 215 that is integrally connected to thesidewall portion 205 of the stabilizingdevice 201. Theextended heel portion 213 is adapted to be positioned in the rearfoot portion of theshoe 200. It is adapted to extend from the medial side of the shoe, around the heel portion of the shoe, to the lateral side of ashoe 300. - In one embodiment, the stiffness of the
extended sidewall portion 215 or the extendedelongated portion 214, or both increases continuously along the medial and lateral sides toward the rear of theextended heel portion 213. In another embodiment, the stiffness of theextended sidewall portion 215, the extendedelongated portion 214, or both decreases continuously along the medial and lateral sides toward the rear 216 of theextended heel portion 213. -
FIG. 11 shows another embodiment of a stabilizingdevice 401 mounted in a shoe 400 with anextended heel portion 213 wherein theelongated portion 204 andsidewall portion 205 are positioned along both the medial and lateral sides of the shoe 400. The extendedelongated portion 214 is integrally formed withelongated portions 204 located on both the medial and the lateral side. Theextended sidewall portion 215 is integrally formed with thesidewall portions 205 on the medial and lateral sides. In this embodiment, the sidewall portions extend into the forefoot region. - As can be seen most clearly in
FIG. 3 , the stabilizing device of the present invention is preferably formed as a monolithic seamless piece, with the elongated portion (204, 704) gradually curving upward to blend into the upper portion of the sidewall portion (205, 705). Preferably, the stabilizing device of the present invention is formed using an injection molding process that allows precise formation of a predetermined continuously and smoothly varying stiffness profile. The stabilizing device is preferably formed of a thermoplastic material, most preferably, a soft thermoplastic injection molded material, such as thermoplastic polyurethane ("TPU"). However, any other material which exhibits well-defined stiffness and resilience properties can also be used, which can be precisely formed into a device having a predetermined continuously and smoothly varying stiffness profile. - The stiffness of the stabilizing devices of the present invention can be directionally varied as needed by changing the thickness of the thermoplastic material. Accordingly, forces created on the shoe by a wearer's foot striking the ground will impact on different thicknesses in various directions along the foot strike path. Regions of thicker material will have a higher stiffness and are positioned where greater resistance is needed compared to thinner regions. In this way, the stabilizing device can be precisely shaped and formed to provide a continuous stiffness profile along a side of a shoe to control the motion of a wearer's foot along a foot strike path and a smooth transition in resistance as the foot rolls from its lateral side on heel strike toward the medial side prior to toe-off.
- It is also contemplated that the density of the thermoplastic material itself can be varied to control the stiffness of the stabilizing device of the present invention. One skilled in the art will appreciate that a combination of density and thickness can also be precisely varied to form a stabilizing device having the desired continuous stiffness profile. Accordingly, the stabilizing device of this invention can be formed with any stiffness profile to provide a continuously varying stiffness in any direction to control the motion of a wearer's foot along a predetermined foot strike path.
- Though in the embodiments shown, the stabilizing device is positioned in a midsole of the shoe, it is understood that the device can be adapted for mounting in any part or parts of a sole of a shoe, which may include an insole, an outsole, a midsole, or any combination of the foregoing. Generally, the stabilizing device is adapted for positioning anywhere below a plane of a wearer's foot with a sidewall extending above the sole and along the side of a wearer's foot. The sidewall preferably extends along a portion of an upper of the shoe.
Claims (15)
- A stabilizing device [201] for use in a shoe having a shoe sole [200], a medial and lateral side, a rearfoot region [224], and an arch region [226], said stabilizing device [201] comprising: a first end [202] for mounting in said rearfoot region [224]; a second end [203] for mounting in said arch region [226]; an elongated portion [204] positioned between said first end [202] and said second end [203], said elongated portion [204] being adapted to extend along a periphery of said shoe sole [200] from said rearfoot region [224] into said arch region [227]; a sidewall portion [205] comprising a lower portion [207] adapted to extend from said elongated portion [204] towards a ground engaging surface [210] of said shoe and to extend from said rearfoot region [224] into said arch region [227], said sidewall portion [205] extending transversely from said elongated portion [204], being adapted for forming a portion of a peripheral wall [209] of said shoe solely on one of said medial and lateral side, and said sidewall portion [205] having a stiffness that varies continuously from said first end [202] toward said second end [203]; and a lower extension portion [208] extending transversely from an end of said lower portion [207] away from said elongated portion [204].
- The stabilizing device of claim 1, wherein said stiffness of said sidewall portion [205] decreases continuously from said first end [202] toward said second end [203].
- The stabilizing device of claim 1, wherein said stiffness of said sidewall portion [205] increases continuously from said first end [202] toward said second end [203].
- The stabilizing device of claim 1, wherein the cross-sectional area formed from said sidewall portion [205] and said elongated portion [204] varies continuously from said first end [202] toward said second end [203].
- The stabilizing device of claim 4, wherein said cross-sectional area decreases continuously from said first end [202] toward said second end [203] or said cross-sectional area increases continuously from said first end [202] toward said second end [203].
- The stabilizing device of claim 1, wherein a stiffness of said elongated portion [204] varies continuously from said first end [202] toward said second end [203].
- The stabilizing device of claim 6, wherein said stiffness of said elongated portion [204] decreases continuously from said first end [202] toward said second end [203].
- The stabilizing device of claim 6, wherein said stiffness of said elongated portion [204] increases continuously from said first end [202] toward said second end [203].
- The stabilizing device of claim 1, wherein said stabilizing device [201] is adapted to extend from said one of said medial side and said lateral side across 20% to 35 % of the width of said shoe at said arch region [226].
- The stabilizing device of claim 1, wherein said elongated portion [204] comprises a surface adapted for positioning flush with an upper surface [212] of a shoe sole [200] of said shoe.
- The stabilizing device of claim 1, wherein said stabilizing device [201] is integrally formed of a thermoplastic material, optionally said thermoplastic material is injection molded thermoplastic.
- The stabilizing device of claim 1, wherein said stabilizing device [201] is adapted to be positioned along said medial side of said shoe or wherein said stabilizing device [201] is adapted to be positioned along said lateral side of said shoe.
- The stabilizing device of claim 1, wherein said stabilizing device [201] further comprises an extended heel portion [213], said extended heel portion [213] comprising: an extended elongated portion [214] that is integrally connected to said elongated portion [204]; and an extended sidewall portion [215] that is integrally connected to said sidewall portion [205], said extended sidewall portion [215] having a stiffness that varies continuously; wherein said extended heel portion [213] is adapted to extend from said one of said medial side or said lateral side, around a heel or end of said shoe, to the other of said medial side or said lateral side of said shoe.
- The stabilizing device of claim 13 wherein the stiffness of at least one of said extended sidewall portion [215] and said extended elongated portion [214] increases continuously along said medial and lateral sides toward the rear of said extended heel portion [213] or decreases continuously along said medial and lateral sides toward the rear of said extended heel portion [213].
- A shoe comprising an upper, a shoe sole [200], a medial and a lateral side, a rearfoot region [224], an arch region [226], and a stabilizing device [201] according to any of the preceding claims positioned along one of said medial side and lateral side so that:the first end [202] is mounted in said rearfoot region [224] of said shoe;the second end [203] is mounted in said arch region [226] of said shoe;the elongated portion [204] extends along a periphery of said shoe sole [200] from said rearfoot region [224] into said arch region [226]; andthe sidewall portion [205] extends from said rearfoot region [224] into said arch region [226], extends transversely from said elongated portion [204], and forms a portion of a peripheral wall [209] of said shoe on one of said medial and lateral side.
Applications Claiming Priority (2)
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US13328208P | 2008-06-26 | 2008-06-26 | |
PCT/US2009/003829 WO2009158029A1 (en) | 2008-06-26 | 2009-06-26 | Shoe sole element for stabilization |
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EP2299949A1 EP2299949A1 (en) | 2011-03-30 |
EP2299949A4 EP2299949A4 (en) | 2017-03-29 |
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US (1) | US20100071231A1 (en) |
EP (1) | EP2299949B1 (en) |
JP (1) | JP5650110B2 (en) |
CN (1) | CN202069737U (en) |
WO (1) | WO2009158029A1 (en) |
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EP2299949A4 (en) | 2017-03-29 |
CN202069737U (en) | 2011-12-14 |
JP5650110B2 (en) | 2015-01-07 |
US20100071231A1 (en) | 2010-03-25 |
JP2011525843A (en) | 2011-09-29 |
WO2009158029A1 (en) | 2009-12-30 |
EP2299949A1 (en) | 2011-03-30 |
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