JP2018149340A - Article of footwear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sole assembly which is for an article of footwear to be used for a high-performance purpose.SOLUTION: A footwear structure includes: an upper 12 in which a bottom part is straw-bell stitched; and a sole assembly 14 which accompanies a top sole 22 arranged in an upper part of a straw-bell board 16. The top sole 22 is manufactured from a foamed material. The sole assembly 14 may include an inner sole 24 which is arranged in an upper part of the top sole 22, and the inner sole 24 may be manufactured from an EVA foamed material. The top sole 22 may be provided with at least 1 mm thickness, while the inner sole 24 may be provided with at least 3 mm thickness. The sum total of the thickness of the top sole 22 and the inner sole 24 may be at least 5 mm. The sole assembly 14 may include a mid-sole 18 (and an outsole 20 as the case may be) that is arranged in a lower part of the straw-bell board 16.SELECTED DRAWING: Figure 2

Description

  This invention relates to footwear, and more particularly to a sole assembly for footwear articles.

  Since footwear is so widespread, the complexity of the technology required to meet the ever increasing demand for footwear tends to be underestimated. This is especially true for performance footwear intended to be used in high performance applications (sports and other athletic efforts).

  Running shoes are one of the most advanced types of footwear. Running is a demanding activity in which footwear plays an important role. It is important that running shoes meet high technical specifications for cushioning and energy balance while being lightweight and durable. One of the roles of running shoes is to protect the runner's body from excessive local loads created during the stride contact phase. Elastomeric foam is an example of a material utilized in a shoe sole to absorb some of the impact energy of a foot-to-ground collision. Typically, a stronger force is generated during the propulsion phase of the contact where the runner pushes the ground to lift himself up into the air. These forces are applied by the runner's forefoot. The main role of the cushion below the forefoot in this phase of the stride is not to reduce these forces, but to reduce the local peak pressure by following the shape of the foot. The sole below the forefoot also performs ancillary actions by compressing and decompressing depending on the runner's stride dynamics.

  A typical shoe configuration creates a layer of non-stretch fabric that is cemented to a sole positioned below the runner's foot. In general, in an athletic footwear configuration, the upper is adapted to the shoe mold and shaped to the desired three-dimensional shape, and then the bottom of the upper is closed with a flat piece roughly shaped like the bottom of the shoe mold. . This can be done by a variety of techniques including board lasting, slip lasting and straw bell stitching. Close stitching at the upper of the strobe bell stitch can be achieved using, for example, a zigzag stitch or strobe bell stitch from a strobe bell stitch machine. In this technology, “strobel boards” can be made from a variety of materials, typically woven (non-wovens, wovens, knits). One of the typical requirements for a strawbell board is to maintain the shape of the upper. Ideally, the board will not expand or contract appreciably (especially in the longitudinal direction). This relatively rigid layer limits the ability of the shoe to fit the runner's foot, typically under loads applied during running.

  Traditional running shoes often have an inner sole (“insole”, “footbed” or “sock” placed in the foot-holding space in the upper upper part of the strawbell board. Also called a "sockliner"). Inner soles are typically manufactured from ethylene vinyl acetate ("EVA"). The inner sole typically provides increased comfort as it provides a layer of cushioning just below the foot above the rigid strawbell board. In some applications, a thin foam layer is disposed above the strawbell board and below the inner sole. The main purpose of this thin foam layer is to improve the local pressure distribution of the wearer's foot against the shoe sole. For example, a thin sheet of foam (often EVA) (e.g., 1-3 mm) can be laminated to a strobel board fabric to form a foam / strobel board laminate. Experience has shown that laminated foam layers improve comfort. A traditional sole configuration that includes only EVA or other similar cushioning material above the strawbell board creates a truly comfortable platform, regardless of whether the sole includes an inner sole and / or a strawbell board laminate The ability to do is limited. The disadvantages are foam layer thickness constraints, foam layer mechanical stiffness attribute limitations, mechanical failure (especially for non-durable foams), and / or non-stretchable strawbells. It arises for several reasons, including the compression constraints of the foam layer due to the lamination of the foam layer to the material. For example, a configuration that includes only a foam / strobebell laminate will adequately conform to the shape of the forefoot during the propulsion phase of the running stride (typically producing the greatest ground reaction force). It ’s too thin. To put it very simply, there is not enough thickness / material to handle the entire impact deformation such that the forefoot (or part of it) “bottoms out” to the underlying strawboard. . Further, since the strob does not extend to the entire width of the front part of the foot, the foam / strobe bell laminate does not cover the entire contact area of the foot. As another example, in a configuration that includes an inner sole of a conventional EVA foam (alone or in combination with a foam / strobe bell laminate), the inner sole (and the foam / strobe bell laminate) is: It undergoes irreversible plastic deformation over time so that it cannot properly rebound. As a result, the combination of conventional EVA foam above the strawbell board is either too thin to fit perfectly in the ankles under peak loads, or permanent compression caused by repeated loads Either the compression set is thick enough to substantially change the “fit” of the shoe.

[Summary of Invention]
The present invention provides a footwear configuration having an upper with a strobe bell bottom and a sole assembly with a top sole positioned above the strobe bell. The top sole is from a foam having an average modulus of about 750 to about 950, about 800 to about 950, about 850 to about 950, or about 875 to about 950 kPa at a stress of 535 kilopascals (kPa). Manufactured. The foam also has an energy efficiency of at least about 78%, at least about 80%, or at least about 82%. Further, the foam has a dynamic compression set of less than about 10%, less than about 8% or less than about 6%.

  The top sole may extend beyond the strawbell board and may cover, for example, the entire area that is loaded by the forefoot. In one embodiment, the top sole extends beyond the edge of the strawbell board and covers the strawbell stitch through the forefoot region. In another embodiment, the top sole extends across the full width of the shoe mold in the forefoot region. In yet another embodiment, the top sole extends across the entire length of the shoe mold through the forefoot region, the arch region and the heel region.

  In various embodiments, the top sole is laminated to a strawbell board. The top sole typically has an average thickness of about 1 mm to about 10 mm, about 2 mm to about 7 mm, or about 2 mm to about 5 mm in the forefoot region. It will be appreciated that the thickness of the top sole may be uniform or may vary (eg, based on footwear configuration, end user, etc.). For example, the top sole may be thicker in the arch region and the heel region in the forefoot region.

  In one embodiment, the footwear configuration includes a sole assembly, the sole assembly comprising an outsole and a midsole disposed below the strawbell board, and a top and inner sole disposed above the strawbell board. Have. The midsole may be made from a conventional midsole foam (such as EVA or polyurethane (“PU”)). The thickness of the midsole can vary depending on the application, but is typically in the range of about 6 mm to about 30 mm in the forefoot region and in the range of about 8 mm to about 35 mm in the heel region. The inner sole may be made from a conventional inner sole foam (typically EVA or PU, etc.) having a thickness between about 3 mm and about 7 mm.

  In one embodiment, the top sole varies in thickness from region to region. In one embodiment, the top sole may be thicker in the arch and heel regions in the forefoot region. The thickness of the top sole may be in the range of about 2 mm to about 10 mm in the forefoot region, in the range of about 1 mm to about 7 mm in the arch region, and about 1 mm to about 7 mm in the heel region. It may be within a range of 7 mm.

  In one embodiment, the strawbell board may define an opening that allows more direct interaction between the top sole and a sole component below the strawbell board (such as a midsole). The size, shape and configuration of the openings can vary. The opening may extend through the forefoot, arch and heel region. Alternatively, the opening may be defined in the forefoot region. In another alternative, the strawbell board may define a plurality of openings, such as one in the forefoot region and one in the heel region. In some applications, the material of the topsole may extend through the opening (s) in the strawbell board. In the implementation of this property, the midsole may define one or more recesses (those intended to receive a topsole material that extends downward through the strawbell board).

  In another aspect, the present invention provides a general step of forming an upper, a general step of attaching a bottom to the upper using a strawbell board, a general step of applying a sole to the lower surface of the strawbell board, A general step of inserting a top sole into the upper upper portion of the bellboard, the top sole having an average factor of about 750-950 kPa at a stress of 535 kPa, an energy efficiency of at least about 78%, and less than about 10% Provided is a method of manufacturing an article of footwear manufactured from a foam having a dynamic compression set. The method may include the step of laminating a top sole on a strawbell board. The laminating step may include directly molding the foam on the strawbell board or may include bonding the top sole to the strawbell board using an adhesive. The top sole may be laminated to the straw bell board before the straw bell board is joined to the upper, or may be laminated to the straw bell board after being joined. The method may include the step of defining an opening in the strawbell board. The top sole may extend to and / or through an opening in the strawbell board. The method may also include changing the thickness of the top sole in different areas.

  The present invention provides a footwear configuration that provides high performance and improved comfort. The topsole is manufactured from a foam that provides comfort and support properties that would not be possible with a conventional strawbell configuration. According to the physical properties of this topsole foam, the topsole (or topsole / innersole combination) can be used during the running stride propulsion phase without worrying about premature failure or excessive compression set. Can also be manufactured with a thickness sufficient to fit the shape of the forefoot. The top sole can be incorporated into the footwear article in a variety of ways, thereby providing flexibility in the design and manufacture of the footwear. If desired, the top sole may extend downward through an opening in the strawbell board to accommodate additional top sole material.

  These and other objects, advantages, and features of the present invention will be more fully understood with reference to the present embodiments and drawings.

  Before describing embodiments of the present invention in detail, it is understood that the present invention is not limited to the details of operation or the details of construction and the arrangement of components shown in the following description or illustrated in the drawings. Should. The invention is capable of being practiced in various other embodiments, and being practiced or carried out in alternative aspects not expressly disclosed herein. It should also be understood that the wording and terminology used herein is for illustrative purposes and should not be considered limiting. The use of “including” and “comprising” and variations thereof is meant to encompass the items listed thereafter and equivalents thereof, as well as additional items and equivalents thereof. Further, enumeration may be used in the description of various embodiments. Except where explicitly stated, the use of enumeration is not to be understood as limiting any specific order or number of components. In addition, the use of enumeration should not be understood as excluding any additional steps or components that may be combined with the enumerated steps or components from the scope of the present invention. Any reference to a claim element as "at least one of X, Y and Z" includes any one of X, Y and Z individually, It is meant to include any combination (eg, “X, Y, Z”, “X, Y”, “X, Z”, and “Y, Z”).

1 is a perspective view of an article of footwear incorporating a top sole according to one embodiment of the present invention. It is an expanded view of footwear articles. FIG. 3 is a cross-sectional view of the article of footwear along line 3-3 in FIG. 1. It is a top view except a part of the sole assembly of footwear articles. FIG. 4B is a cross-sectional view of the article of footwear taken along line 4B-4B of FIG. 4A. FIG. 5 is a cross-sectional view of the article of footwear taken along line 5-5 in FIG. FIG. 6 is an exploded view of a footwear article according to an alternative embodiment. FIG. 4 is a cross-sectional view of an alternative footwear article similar to FIG. 3. FIG. 2 is a cross-sectional view of a first alternative foam / strobebell laminate. FIG. 6 is a cross-sectional view of a second alternative foam / strobebell laminate.

[Description of this embodiment]
[Overview]
FIG. 1 shows an article of footwear incorporating an embodiment of the present invention. Footwear article 10 generally includes an upper 12 and a sole assembly 14. The upper 12 is manufactured using a straw bell configuration and bottomed with a straw bell board 16. The sole assembly 14 generally includes an outsole 20 and a midsole 18 disposed below the strawbell board 16 and a top sole 22 disposed above the strawbell board 16. The top sole 22 can be laminated to the strawbell board 16 or otherwise attached to the strawbell board 16. An inner sole 24 (or sock liner) may be disposed above the top sole 22. The top sole 22 is manufactured from a foam having an average coefficient of about 750 to about 950 kPa at a stress of 535 kPa, an energy efficiency of at least about 78%, and a dynamic compression set of less than about 10%.

  While this embodiment is illustrated in the context of athletic shoes or running shoes, any type or style of footwear (performance shoes, hiking shoes, trail shoes, boots, hiking boots, all-terrain shoes, barefoot running shoes, sneakers, Conventional tennis shoes, walking shoes, multi-sport footwear, casual shoes, dress shoes, or any other type of footwear or footwear component). Also, directional terms ("vertical", "horizontal", "top", "bottom", "upper", "lower", "inner", "inside", "outer" and " "Outside" or the like) is used to assist the description of the invention based on the orientation of the illustrated embodiment. Further, the terms “medial”, “lateral” and “longitudinal” are used in the commonly used manner in connection with footwear. For example, when used with reference to the side of a shoe, the term “center” refers to the inner side (ie, the side facing the other shoe) and “lateral” refers to the outward side. When used in relation to a direction, the term “longitudinal” generally refers to the direction extending along the length of the shoe between the toe and the heel, and the term “lateral” generally refers to the central and lateral sides of the shoe. Reference is made to the direction extending across the shoe width between. The use of directional terms should not be construed as limiting the invention to any particular orientation.

  Further, as used herein, the term “arch region” (or arch or midfoot) generally refers to a sole assembly corresponding to the arch or midfoot of a wearer's foot. Or refer to a part of footwear. The term “forefoot region” (or forefoot) generally refers to an arch region that corresponds to the forefoot portion of a wearer's foot (eg, including a ball and toe). Refer to the part of the footwear ahead. The term “heel region” (or heel) generally refers to the portion of the footwear behind the arch region that corresponds to the heel of the wearer's foot. The forefoot region 60, the arch region or midfoot region 62 and the heel region 64 are generally identified in FIG. 4A, although the depiction of these regions may vary depending on the configuration of the sole assembly and footwear. Should be understood.

[Top sole foam]
As described above, the top sole 22 is preferably manufactured from a foam having certain defined mechanical properties that are suitable for use above the strawbell board. For example, the foam of the top sole 22 is desirably compliant, resilient, durable, and highly conformable. Moreover, since the foam of the top sole 22 may be laminated on the straw bell board, it is beneficial that the foam of the top sole 22 can be sewn together.

  Regarding the modulus, it is desirable that the foam of the top sole 22 has a lower coefficient than a conventional midsole foam (such as EVA midsole foam). There is a practical limit to the use of low coefficient EVA foam in footwear because low coefficient EVA foam breaks prematurely under loads generated during peak forefoot loads. Examples of failure include inability to rebound after loading (eg, permanent compression), tearing, etc. In order to prevent premature failure, low modulus EVA foam can only be used in relatively thin layers (eg 1 to 3 mm). Unfortunately, the use of a thin foam layer limits suitability, which is an important objective for the sole under the forefoot. Thus, the foam of the top sole 22 is durable enough to be used in a layer that is thick enough to fit the foot during forefoot loads, and thus loses its properties over repeated cycles. It is desirable to be flexible. In various embodiments, the top sole 22 does not include EVA foam.

  With such objectives in mind, the top sole 22 is manufactured from a soft, highly elastic (energy efficient) and durable material. Examples of foams suitable for the purposes of this disclosure include certain expanded thermoplastic polyurethane ("E-TPU") foams and thermoplastic elastomer ("TPE") foams. In some embodiments, the top sole 22 comprises E-TPU foam, consists of E-TPU foam, or consists essentially of E-TPU foam. In other embodiments, the top sole 22 comprises TPE foam, consists of TPE foam, or consists essentially of TPE foam.

  Examples of suitable foams are “180SD” E-TPU foam, commercially available from Guo Sheng, Chidian Town, Jinjiang City, Fujian, China; commercially available from Ecocell, Nan-Cheng, Dongguan City, Guangdong, China Possible high-rebound TPE PH-60 foam, “X-Bounc45” foam, commercially available from Fine Chemical, Gimhae, Gyungnam, Korea, “S”, commercially available from Superfoam, Dongguan, Guangdong, China -Lite "foam and" Infinergy® "foam commercially available from BASF Corporation of Florham Park, NJ.

  The foam of the top sole 22 is highly elastic, more compliant than EVA foam at low stresses (such as those that occur while standing), and with respect to thickness changes after repeated impacts More resistant. In particular, the foam of the top sole 22 can provide better performance than the EVA straw board foam, particularly in the front part. The softness of the foam of the top sole 22 allows for additional shock absorption and increased comfort during a forefoot strike. In addition, the foam of the top sole 22 provides benefits during propulsion. Specifically, the foam of the top sole 22 absorbs shear forces during landing (released during toe separation). The increased energy efficiency of the top sole 22 foam produces a more efficient stride.

  The foam used to manufacture the top sole 22 has “soft”, “elastic”, and “durable” mechanical properties defined by impact tests on material samples. For example, the mechanical properties of a foam can be measured with an electromagnetically driven impact test device (ElectroPuls E3000, Instron, Norwood, Mass.). The procedure may be a modified version of ASTM F1614-99 (2006) “Standard Test Method for Shock Attenuating Properties of Materials Systems for Athletic Footwear Procedure C”. A modification of the principle is the use of a 45 mm disk shaped sample (rather than a 3 inch minimum square sample).

  The load curve is controlled to simulate a foot collision. The sample is about 20 mm thick (and the resulting data is normalized by thickness). Mechanical attributes of interest include average stiffness, energy efficiency, dynamic compression set, and foam average hardness at 535 kilopascals (kPa). Here, 535 kPa is selected as a typical peak stress during foot impact. Because the foam of the top sole 22 is “soft” and “elastic”, the important mechanical attributes of interest are average factor and energy efficiency. Average hardness is normalized as an average factor by taking into account the cross-sectional area of the impact tup (using a 45 mm diameter tap or “striker”) and multiplying by the sample thickness It becomes. Energy efficiency is the ratio of energy returned by the sample divided by the energy absorbed by the sample.

  Each foam sample is impact tested 1000 times to obtain a baseline measurement of mechanical attributes. To determine the attribute, the 980th, 990th, and 1000th impact cycles are averaged.

  Dynamic compression set is used as a measurement of durability. Dynamic compression set is the change in sample thickness for a given number of impacts. Each foam sample was impact tested 1000 times to obtain baseline measurements of mechanical attributes (including average factor and energy efficiency), and then 100,000 times to simulate an extended load cycle. It is impact tested (with the same load profile) and then impact tested 1000 more times to obtain a measurement of the mechanical attributes after loading.

  In various embodiments, the foam utilized in the manufacture of the disclosed top sole 22 has an average coefficient of about 750 to about 950 kPa, about 800 to about 950 kPa, about 850 to about 950 kPa, or about 875 to 950 kPa. . The average factor is analyzed at a stress of 535 kPa according to a modified version of ASTM F1614-99 (2006). The foam also has an energy efficiency of at least about 78%, at least about 80%, or at least about 82%. Energy efficiency is analyzed according to a modified version of ASTM F1614-99 (2006). Further, the foam has a dynamic compression set of less than about 10%, less than about 8%, or less than about 6%. Dynamic compression set is analyzed according to a modified version of ASTM F1614-99 (2006). An Asker C Durometer Gage may be used to determine Asker C hardness values.

  Due to its material attributes, the foam of the top sole 22 can be used in greater thicknesses without prematurely losing mechanical attributes. The foam of the top sole 22 not only provides improved mechanical attributes, but by placing the top sole 22 above the strawbell board 16, the topsole 22 can be compared with the strawbell board 16. Move the rigid, incompatible layer and cement it further away from the foot.

  In various embodiments, the top sole 22 has an average thickness of about 1 mm to about 10 mm, about 2 mm to about 7 mm, or about 2 mm to about 5 mm in the forefoot region. It should be understood that the thickness of the top sole 22 may be uniform and may vary (eg, based on footwear configuration, end user, etc.). The thickness of the top sole 22 may vary depending on the shoe area. For example, in the forefoot region, the top sole 22 may have a thickness in the range of about 2 mm to about 10 mm or in the range of about 3 mm to about 7 mm, and in the heel region, the top sole 22 May have a thickness in the range of about 1 mm to about 7 mm, or in the range of about 2 mm to about 5 mm. In the embodiment of FIG. 1, the top sole 22 has a maximum thickness of approximately 5 mm in the central forefoot region and a thickness of approximately 3 mm through the heel region. The top sole 22 may gradually transition between 5 mm and 3 mm through the arch area.

  Examples of soft, resilient and durable foams suitable for the purposes of the present disclosure and examples of conventional foams not suitable for the purposes of the present disclosure are shown in Tables I-IV below. In particular, Examples 1-4 are considered comparative examples, and Examples 5-8 are considered invention examples suitable for forming the top sole 22 of the present disclosure.

  Foam samples for each example are tested as described above. An Asker durometer may be utilized to determine the Asker C hardness value of each foam sample. Asker durometers are readily available from several commercial sources and their use will be appreciated by those skilled in the art. Next, each example will be described in more detail.

  Example 1 is an EVA foam conventionally used in a midsole having a 52 Asker C hardness, commercially available from Fine Chemical, Gimhae, Gyungnam, Korea.

  Example 2 is an EVA foam conventionally used in a strawboard laminate having a 42 Asker C hardness, commercially available from Xie Li, Gaobu Town, Dongguan, China.

  Example 3 is a polyurethane foam in the hardness range for a midsole with a hardness of 35 Asker C, commercially available under the designation "U-2" from Jones and Vining, Brockton, Massachusetts .

  Example 4 is a softer conventional polyurethane foam having a hardness of 25 Asker C, commercially available under the designation “U-14Soft” from Brockton, Massachusetts.

  Example 5 is an E-TPU foam available under the “180SD” designation from Guo Sheng, Chidian Town, Jinjiang City, Fujian Province, China.

  Example 6 is a TPE foam having a hardness of 47 Asker C, commercially available under the “PH-60” designation from Nan-Cheng Ecocell, Dongguan, Guangdong, China.

  Example 7 is a foam having a hardness of 45 Asker C, commercially available under the designation "X-Bounc 45" from Fine Chemical, Gimhae, Gyungnam, Korea.

  Example 8 is a TPE blend foam having a hardness of 52 Asker C, commercially available under the “S-Lite” designation from Superfoam, Dongguan, Guangdong, China.

  Example 9 is an E-TPU foam available under the “160SD” designation from Guo Sheng, Chidian Town, Jinjiang City, Fujian Province, China.

  The average factor for each example is determined according to a modified version of ASTM F1614-99 (2006) as described above. A limit of about 750 to about 950 kPa is selected as the threshold for the average factor. Examples of foams that fall within this range are considered to have desirable softness, and foam examples that fall outside that range are considered to have undesirable softness. The results are illustrated in Table I below.

  As illustrated in Table I above, Example 1 and Example 3 are both outside the average coefficient range. In short, Example 1 and Example 3 both have undesirable softness, while Example 2 and Examples 4-9 all have desirable softness.

  The energy efficiency of each example is also determined as described above. A limit of at least about 78% is selected as a threshold for energy efficiency. Examples of foams that fall within this range are considered to have the desired resiliency (ie, the desired “returned energy” / “energy absorbed” ratio), and foam examples that fall outside that range are inadequate It is considered to have a good elasticity. The results are illustrated in Table II below.

  As illustrated in Table II above, Examples 1-4 are all outside the energy efficiency range. In short, Examples 1-4 all have insufficient elasticity, but Examples 5-9 all have desirable elasticity.

  The dynamic compression set for each example is also determined as described above. A limit of less than about 10% is selected as the threshold for dynamic compression set. Examples of foams that fall within this range are considered to have desirable durability, and those that fall outside that range are considered to have insufficient durability. The results are illustrated in Table III below.

  As illustrated in Table III above, Example 1 and Example 2 are both outside the dynamic compression set range. In short, Example 1 and Example 2 both have insufficient durability, while Examples 3-9 all have desirable durability.

  All of the results are tabulated and presented in Table IV below. In short, Examples 1-4 all have one or more attributes that are undesirable for the purposes of the present disclosure, but Examples 4-9 are all suitable for forming the top sole 22 of the present disclosure. Owns the attribute.

[Composition of footwear]
As described above, the footwear article 10 shown in FIG. 1 generally includes an upper 12 and a sole assembly 14. The upper 12 is manufactured using a straw bell configuration and bottomed with a straw bell board 16. The sole assembly 14 generally includes an outsole 20 and a midsole 18 disposed below the strawbell board 16 and a top sole 22 disposed above the strawbell board 16. The top sole 22 can be laminated to the strawbell board 16 or otherwise attached to the strawbell board 16. An inner sole 24 (or sock liner) may be disposed above the top sole 22. The topsole 22 of the illustrated embodiment is manufactured from a foam having an average modulus of about 750-950 kPa at a stress of 535 kPa, an energy efficiency of at least about 78%, and a dynamic compression set of less than about 10%. Is done. The top sole 22 is thick enough to conform to the shape of the foot through the forefoot region during the propulsion phase of contact. For example, in the illustrated embodiment, the top sole 22 has a thickness of about 5 mm through the center of the forefoot region.

  Upper 12 is generally a conventional upper whose bottom is closed by a strawbell board 16. Although the configuration of the upper 12 may vary depending on the application, the upper 12 of FIG. 1 generally comprises a vamp (or toe box) 40, a tongue 42 and one or more waists 44. Prepare. Upper 40 generally forms the forefoot portion of upper 12 and may be manufactured from any combination of parts of upper material. The tongue 42 may be joined to the upper 40 and may extend rearward to support a shoelace (not shown). The tongue 42 can be manufactured from any combination of parts with the upper 40. The tongue 42 may be stuffed to partially assist in protecting the wearer's foot from the shoelace. The waistband (s) 42 form the heel portion of the upper 12 and can be manufactured from any combination of parts of the upper material. The interior of upper 40, tongue 42 and waist 44 may be covered with a lining material (such as a layer of DriLex, Cambrelle, or other lining material). The various parts of the upper 12 are made from a wide range of materials (leather, synthetic leather, mesh, canvas, woven (eg, wovens, knit, bonded fibers), fabric, Mold components, etc.). Upper 12 may include various trims, cushioning and reinforcing elements. For example, a heel counter (not shown) may fit within the heel region to reinforce the heel cup and enhance support. As another example, a toe cup (not shown) may be provided to reinforce upper 40. Further, the padding may be sandwiched between the layers of the upper 12 (for example, between the upper 40 and the lining material). The reinforcing element may be affixed to the upper 12 to reinforce the portion of the upper 12 that receives the shoelace. The configuration of the upper 12 shown is merely exemplary and the present invention can be incorporated into footwear including essentially any upper configuration.

  In the illustrated embodiment, the bottom of the upper 12 is closed by a strawbell board 16 or a strawbelt fabric (these terms are used interchangeably herein). Strobel board 16 is typically manufactured from a non-stretchable fabric or woven fabric (ie, one that does not stretch appreciably). For example, the strawbell board 16 can be made from a non-woven textile, a woven textile, or a knit textile. If the strawbell board 16 is intended to maintain the shape of the upper 12, the strawbell board 16 does not expand or contract appreciably (especially in the front-rear direction). The strawbell board 16 may be a composite construction manufactured from a combination of various materials that give the strawbell board 16 different properties in different regions. For example, this type of composite strawbell board 16 may have a forefoot region and a heel region manufactured from different materials. This allows the strawbell board 16 to provide different mechanical attributes in different areas (e.g., relatively soft ankles, relatively stiff arches, relatively stiff heels, etc.). In the illustrated embodiment, the bottom end of the upper 12 terminates in a lasting arrow once 50 that is wound inwardly and joined to the strawbell board 16. In the illustrated embodiment, the lasting arrow once 50 is secured to the strobing board 16 at a butt-seam by stitches 52 (such as zigzag stitching or strobing stitches from a strobing machine) (FIGS. 2 and 4A). reference). Although the illustrated embodiment includes a strobebell configuration, the present invention can be incorporated into other footwear configurations (such as a board rusted configuration or a slip rusted configuration) that may benefit from the use of a top sole. In these alternative lasted configurations, the top sole may be laminated to the lasting board (eg, formed directly on the lasting board or first formed and then secured to the lasting board. May be separated from the lasting board.

  The sole assembly 14 of FIG. 1 may be a two-piece configuration that generally includes a midsole 18 and an outsole 20 as described above. The midsole 18 can be constructed from a material having a certain density, which can be generally less than the density of the outsole 20. The former density may optionally be from about 5 pounds / cubic foot to about 20 pounds / cubic foot, depending on the application, and from about 9 pounds / cubic foot to about 15 pounds / cubic foot, Or other densities. In general, the midsole density is such that it is relatively easily compressed to provide cushioning to the wearer's foot. The midsole material is also a durometer (optionally about 30 Asker C to about 55 Asker C, more optionally about 42 Asker C to about 48 Asker C, and optionally about 45 Asker C or about 43 Asker C). You may have. The midsole may be composed of ethyl vinyl acetate (EVA), polyurethane, latex, foam, gel or other material.

  Midsole 18 may include an upper surface 30 and an oppositely directed lower surface 32. In general, the upper surface 30 may be joined directly to the lower surface of the closed upper 12. For example, the midsole 18 may be joined to the lower surface of the strawbell board 16 and an inwardly-turned marginal allowance that bends inside the upper 12. The top surface 30 may be shaped to closely follow the natural contour of the bottom of the wearer's foot. For example, midsole 18 may be shaped in the heel region to define a heel cup (generally extending around and containing a portion of the wearer's heel when the wearer wears footwear). The heel cup may include an upwardly extending flange 34 (a substantially continuous wall that binds and surrounds the rear of the wearer's heel). This upwardly extending flange or wall 34 may also extend upward along the bottom of the upper 12 when the upper is joined to the sole assembly 14. The flange 34 may optionally extend upwardly from about 1.0 mm to about 10.0 mm, and optionally further from about 2.0 mm to about 6.0 mm, or other distance as appropriate. In the illustrated embodiment, the flange 34 gradually tapers down toward the toe tip of the sole assembly 14. The flange 34 may provide some reinforcing support to the upper in the heel region and may generally resist lateral or central rotation of the heel.

  The outsole 20 can be disposed below the midsole 18 and the upper 12. In the illustrated embodiment, the outsole 20 is manufactured from a single piece layer that is generally coextensive with the lower surface 32 of the midsole 18. However, the outsole 20 may be manufactured from a plurality of separate segments that are individually secured to the lower surface 32 of the midsole 18 (see, eg, the alternative embodiment shown in FIG. 5). The outsole 20 can be composed of one or more materials, and the present embodiment can be composed of a mixture of foam and rubber. Alternatively, it can be composed of a thermoplastic polyurethane elastomer (TPU), rubber, nylon, or other polymer blend (including nylon and / or TPU). These materials are merely exemplary, and the outsole 20 is essentially any polymer, elastomer and / or natural or artificial rubber or other material that is relatively abrasion resistant (desired functional properties). Can be provided). The outsole can also be configured to include a thermoplastic elastomer and / or a thermoset elastomer. Other materials such as fiber reinforced polymers may be used. These may include epoxy, polyethylene, polyester, carbon reinforced thermoset plastic, glass, and / or aramid fibers.

  The outsole 20 of FIGS. 1-3, 4A and 4B is shown with a generally smooth bottom, surface that engages the ground. As shown in connection with the alternative embodiment of FIG. 5, the bottom surface of the outsole 20 includes a plurality of protrusions 36 '(or cleats, grooves, channels, ground planes). ), Tread grooves, etc.). The protrusion 36 'may be essentially any shape, may be textured, and may have surface features through a portion that engages the ground. As described above, the outsole 20 may be a single continuous section of material or may be formed from a plurality of separate outsole segments. Outsole 20 or each outsole segment may include one or more flex contours 38 '. The flexible profile 38 'is generally placed in the front part of the foot, between the foot ball and the toe to allow the toes to bend independently (and more easily with respect to the foot ball). can do. In general, the flexible profile 38 'has an outsole thickness that is reduced (or not present at all) compared to the thickness of the outsole in the ball of the foot and / or in the toe or region. Not) region.

  The midsole 18 and outsole 20 can be manufactured as a unit sole, which may be secured to the bottom of the upper 12 after lasting. Alternatively, the midsole 18 may be first joined to the bottom of the upper 12, and after the midsole 18 is joined to the upper 12, the outsole 20 may be joined to the bottom of the midsole 18.

  As described above, the article of footwear 10 includes a top sole 22 that is disposed above the strawbell board 16. The top sole 22 is made from a foam having an average coefficient of about 750 to about 950 kPa at 535 kPa, an energy efficiency of at least about 78%, and a dynamic compression set of less than about 10%. However, these values may vary depending on the application as described above. For example, the average coefficient at 535 kPa may be about 750 to about 950 kPa, about 800 to about 950 kPa, about 850 to about 950 kPa, or about 875 to about 950 kPa. Good. Further, the energy efficiency may be at least about 78%, may be at least about 80%, and may be at least about 82%. Finally, the dynamic compression set may be less than about 10%, less than about 8%, or less than about 6%.

  In the illustrated embodiment, the top sole 22 is laminated to the upper surface of the strawbell board 16. For example, the top sole 22 may be adhesively fixed to the top of the straw bell board 16 after the upper 12 and the straw bell board 16 are joined. However, the top sole 22 may be cemented to the strawbell board 16 before or after lasting. As an alternative to gluing, the top sole 22 may be formed directly at a suitable location on the top surface of the strawbell board 16. For example, by placing the strawbell board 16 in the mold, introducing the topsole foam into the mold, and curing the topsole foam in close contact with the strawbell board 16 at an appropriate location in the mold. May be formed. In this alternative, the top sole 22 may be molded in place on the strawbell board 16 prior to joining the strawbell board 16 to the bottom of the upper 12. In some applications, the top sole 22 may be molded in place on the strawbell board 16 after lasting. It is not essential to stack the top sole 22 on the straw bell board 16. For example, in some applications, the top sole 22 may fit loosely (without providing a direct connection between these two components) within the upper 12 on the top of the strawbell board 16. This option is more feasible in applications where the top sole 22 has sufficient inherent structural rigidity to maintain its shape without being joined to the strawbell board 16.

  As described above, the strawbell board 16 closes the bottom of the upper 12. In the illustrated embodiment, the strawbell board 16 generally extends continuously through the forefoot region, the arch region, and the heel region. In this embodiment, the strawbell board 16 is formed without an opening and substantially plugs the entire opening at the bottom of the upper (which is defined by the terminal edge of the lasting arrow once 50 around its perimeter). The size, shape and configuration of the lasting allowance 50 may vary depending on the application, resulting in various sizes, shapes and configurations of the strawbell board 16.

  If desired, the foot receiving space within the upper 12 may be expanded in whole or in part to accommodate the top sole 22. For example, in connection with FIGS. 1-3, 4A and 4B, the shoe mold may be extended over the entire length of the shoe mold to accommodate the extra thickness of the top sole 22. This expansion may be uniform throughout the shoe mold or may vary. For example, the amount of enlargement may be proportional to the thickness of the top sole 22. As another example, the shoe mold may be enlarged only in the forefoot region or only in other regions where the top sole 22 may be thickest.

  In this embodiment, the top sole 22 forms the bottom of the foot accommodating space inside the upper 12. As shown, the top sole 22 is essentially coextensive with the sole assembly 14 and the bottom of the upper 12 extending from the toes to the heel and from the lateral side to the central side. In this embodiment, the top sole 22 covers the lasting arrow once 50 and the straw bell board 16 (see FIGS. 3 and 4B). The top sole 22 may be different in size, shape and configuration. For example, the top sole 22 may extend only through the selected area (such as the forefoot area) or may not exist in other areas (such as the heel area). As another example, the top sole 22 may have one or more apertures or openings in selected positions. The aperture or opening may be empty and may be occluded by another material (such as a cushioning material of various mechanical attributes).

  As best shown in FIG. 2, the top sole 22 of the illustrated embodiment is generally uniform in thickness from toe to heel. In the illustrated embodiment, the top sole 22 is about 3 mm thick. Alternatively, the top sole 22 may have a thickness of about 1 mm to about 10 mm, or about 2 mm to about 7 mm, or about 2 mm to about 5 mm. Instead of a uniform thickness, the top sole may vary in thickness through various regions of the sole. For example, as shown in FIG. 5, the top sole 22 'may be thicker in the forefoot region than in the arch or heel region. In the embodiment of FIG. 5, the top sole 22 'has a maximum thickness of approximately 5 mm through most of the forefoot region and a thickness of approximately 3 mm through the heel region. The top sole 22 'includes a gradual transition between these two thicknesses in the arch area. However, the thickness of the top sole 22 'may vary depending on the application and region. For example, the top sole has a thickness in the forefoot region in the range of about 1 mm to about 10 mm, or in the range of about 2 mm to about 7 mm, or in the range of about 2 mm to about 5 mm, and in the arch region , Having a thickness in the range of about 1 mm to about 7 mm, or in the range of about 1 mm to about 5 mm, and in the heel region, in the range of about 1 mm to about 7 mm, or in the range of about 1 mm to about 5 mm You may have.

  The inner sole 24 may fit into the upper 12 above the top sole 22. The inner sole 24 may extend over the entire length and width of the foot accommodating space. Inner sole 24 may be made from a material having a density that is generally less than the density of midsole 18. Inner sole density is optionally from about 5 pounds / cubic foot to about 15 pounds / cubic foot, more optionally from about 7.5 pounds / cubic foot to about 12.5 pounds / cubic foot, or depending on the application. Other densities may be used. The material of the inner sole 24 is a durometer (optionally about 15 Asker C to about 50 Asker C, more optionally about 20 Asker C to about 45 Asker C, and optionally about 25 Asker C to about 35 Asker C. ). Inner sole 24 may be composed of EVA, polyurethane, latex, foam, gel or other material. In the illustrated embodiment, the inner sole 24 is manufactured from EVA and has a thickness of approximately 3-7 mm, although the thickness may vary depending on the application. For example, the inner sole may have a thickness in the range of about 2 mm to about 10 mm, or in the range of about 1 mm to about 12 mm. The inner sole 24 of the illustrated embodiment has a uniform thickness, but the thickness may be appropriately changed depending on the application. For example, the inner sole 24 may be thicker in the heel region. The inner sole 24 may be loosely fitted to the upper 12 so that it can be easily attached and removed, or may be adhesively fixed in the upper 12. For example, the inner sole 24 may be bonded to the top surface of the top sole 22. The inner sole 24 is referred to as an “inner sole”, but is also known as an “insole”, “footbed” or “sock liner”.

  In an alternative embodiment, the strawbell board may include one or more openings. For example, alternative embodiments are shown in FIGS. For ease of disclosure, the embodiment of FIGS. 6-7 includes a reference number corresponding to the reference number of FIGS. 1-3, 4A and 4B (but followed by a double dash (ie, “″”)). Except that). As perhaps best shown in FIGS. 6-7, the footwear article 10 "includes a strawbell board 16" that defines a central opening 54 ", the perimeter of which is shown by a dashed line in FIG. In this example, a central opening 54 "extends through at least a portion of the forefoot region 60", the arch region 62 ", and the heel region 62". However, the number, size, shape, position and configuration of the strobebell board openings can vary depending on the application. For example, the strawbell board 16 "may include an opening only in the forefoot region 60". As another example, the strawbell board 16 "may include separate openings in the forefoot region 60" and in the heel region 64 ". Returning to the embodiment of FIG. 6, the central opening 54 ″ may be formed by removing the central portion of the strawbell board 16 ″ by die cutting after lasting. Alternatively, the strawbell board 16 '' may be wrapped around the periphery of the central opening 54 '' so that the strawbell board material occupying the central opening 54 '' can be peeled off the strawbell board 16 '' after lasting. It may be formed with perforations or other line of weakening. In the embodiment of FIGS. 6-7, the top sole 22 "extends downward through the central opening 54" and terminates in alignment with the bottom surface of the strawbell board 16 ". This configuration is merely exemplary, and the top sole may extend in various positions relative to the strawbell board. For example, in applications where there is an opening in the strawbell board, the top sole 22 '' 'may extend down through the opening 54' '' as shown in FIG. 8, or as shown in FIG. 22 '' '' may extend above the opening 54 '' '' in the strawbell board 16 '' ''. The embodiment of FIG. 8 is particularly useful in applications where it is desirable to include additional top sole material and provide a more direct interaction between the top sole 22 ′ ″ and the midsole 18 ′ ″. Useful. In this embodiment, the top sole 22 "" extends outward beyond the circumference of the strawbell board 16 "", thereby covering the lasting arrow once and the butt seam. The embodiment of FIG. 9 may be particularly useful when the top sole 22 "" is die cut from a sheet of top sole foam of uniform thickness. For example, in this embodiment, the top sole 22 "" "may be die cut and then bonded to the top surface of the strawbell board 16" ". In this embodiment, the top sole 22 ″ ″ ″ and the strawbell board 16 ″ ″ ″ are common boundaries in the sense that they share the same outer edge. This common boundary configuration may be particularly useful in applications where the top sole 22 "" "extends beyond the strawbell board 16" "and does not need to cover the lasting arrow once.

  The above description is that of this embodiment of the invention. Various alternatives and modifications can be made without departing from the spirit and broader aspects of the invention as defined in the appended claims, which are construed in accordance with the principles of patent law, including doctrine of equivalents. Should. This disclosure is presented for purposes of illustration, and should not be construed as an exhaustive description of all embodiments of the invention, and the claims are illustrated or described in connection with these embodiments. Nor should it be construed as limited to a particular element. For example, and without limitation, any individual element of the described invention can be replaced by an alternative element that provides substantially similar functionality or otherwise provides proper operation. This may be, for example, a known alternative element (such as one that one skilled in the art may currently know) and an alternative element that may be developed in the future (such as one skilled in the art will recognize as an alternative during development). Possible). Further, the disclosed embodiments include a plurality of features that may be described in partnership and potentially provide a set of benefits. The invention is not limited to embodiments that include all of these features, nor is it limited to those that provide all of the described benefits (although explicitly defined in the claims in other ways). Except the range). Any reference to a singular element in a claim (eg, using the articles “a”, “an”, “the”, or “said”) is understood to limit that element to the singular. Should not.

  All ranges and subranges explicitly disclosed in connection with various embodiments of the invention are such subranges and all subranges within such ranges (of which integer values and / or Or, fractional values are to be construed as describing, taking into account, including and disclosing (including even where such values are not expressly written herein). Accordingly, an explicitly recited range and sub-range should be construed as disclosing and providing support for all possible sub-ranges within that recited range and sub-range. This includes, but is not limited to, ranges and subranges that divide the listed ranges and subranges (such as representations into fractional fragments such as 1/2, 1/3, 1/4, 1/5, etc.) Not. By way of example only, explicit disclosure of the “0.1 to 0.9” range is intended to be any and all possible values and subranges within the range of 0.1 to 0.9 (0.1 and 0. Includes all individual values between 9 and limits the lower limit by any value between 0.1 and 0.9 and limits the upper limit by any value between 0.1 and 0.9 And any sub-ranges of values made up) should be construed as being essentially disclosed. This is also the range expressed in the fractional fraction (eg, 1/3 from the lower (ie 0.1-0.3), 1/3 in the middle (ie 0.4-0.6), It should also be construed to include all subranges derived by the upper third (ie 0.7-0.9), etc. Thus, an explicit enumeration of a range or sub-range provides appropriate support for any and all claims terms directed to any value or sub-range consisting of values within the explicitly enumerated range. Should be construed as providing (individually and / or collectively). In addition, for terms that define or modify a range (eg, “at least” “greater than” “less than” “less than”, etc.), such terms should be understood to include subranges and / or upper or lower limits. is there. As another example, a range of “at least 10” should be construed to include at least 10-35 sub-ranges, at least 10-25 sub-ranges, at least 25-35 sub-ranges, and the like. . By way of further example, a disclosed range or sub-range should be construed as disclosing and providing support for any individual number within that range and sub-range. To illustrate, a “1-9” range includes all individual values 1-9, includes individual integers (such as “3”), and includes decimal numbers (or fractions) (such as “4.1”). ).

Claims (14)

An upper having a closed bottom, the upper defining a foot receiving space above the closed bottom; and
A top sole disposed within the foot receiving space, the top sole having an average coefficient of about 750 to about 950 kPa at a stress of 535 kPa, an energy efficiency of 78% or more, and a dynamic compression permanent of less than 10% A top sole comprising a foam having a strain;
An inner sole disposed above the top sole in the foot receiving space, the inner sole comprising a foam having an energy efficiency of less than 78% and a dynamic compression set of 10% or more. Including inner sole,
In a footwear article comprising:
The foam of the top sole comprises an expanded thermoplastic polyurethane (E-TPU) foam or a thermoplastic elastomer (TPE) foam;
The top sole has a thickness of at least 1 millimeter;
The inner sole has a thickness of at least 3 millimeters;
The top sole and the inner sole have a combined thickness of at least 5 millimeters in a central portion of a foot region of the footwear article;
Footwear articles. The upper is closed by a strawbell board,
The top sole is joined to the straw board;
The article of footwear according to claim 1. The upper includes a lasting allowance,
The straw bell board is joined to the lasting arrow once at the butt seam,
The top sole extends beyond the straw bell board, the butt seam and the lasting arrow once;
The article of footwear according to claim 2.   The article of footwear according to claim 2, wherein the top sole is laminated on the straw bell board.   The article of footwear according to claim 2, wherein the top sole is formed directly on the strawbell board.   The article of footwear according to claim 2, wherein the strawbell board defines an opening.   The article of footwear according to claim 6, wherein the top sole extends into the opening.   The article of footwear according to claim 2, further comprising a midsole disposed below the straw bell board.   The article of footwear according to claim 1, wherein the top sole has a thickness of at least 3 millimeters.   The footwear article according to claim 1, wherein the top sole extends through a forefoot region, an arch region, and a heel region of the footwear article.   The top sole has a first thickness in a forefoot region and a second thickness in a heel region, the first thickness being greater than the second thickness. Footwear articles as described in 1.   The article of footwear according to claim 1, wherein the inner sole comprises ethylene vinyl acetate (EVA) foam.   The footwear article according to any one of claims 1 to 12, wherein the top sole includes the E-TPU foam.   The footwear article according to any one of claims 1 to 12, wherein the top sole includes the TPE foam.

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