Sole structure for article of footwear

Abstract

A sole structure for an article of footwear includes a heel region, a forefoot region, a fluid-filled chamber, and a midsole. The fluid-filled chamber extends from the heel region to the forefoot region. The midsole includes a first protrusion that contacts the fluid-filled chamber at a first contact region in the forefoot region and a second protrusion that contacts the fluid-filled chamber at a second contact region in the heel region. The first protrusion is spaced apart from the second protrusion to define a void.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This PCT international application claims priority to U.S. Application No. 18 / 451,470, filed on August 17, 2023, which in turn claims priority under 35 USC §119(e) to U.S. Provisional Application No. 63 / 373,090, filed on August 22, 2022. The disclosures of these prior applications are considered part of the disclosure of this application and are hereby incorporated by reference in their entirety. Technical Field

[0003] The present disclosure relates generally to an article of footwear and, more particularly, to a sole structure for an article of footwear. Background Art

[0004] This section provides background information related to the present disclosure and is not necessarily prior art.

[0005] Articles of footwear traditionally include an upper and a sole structure. The upper may be formed of any suitable material to receive, secure and support the foot on the sole structure. The upper may cooperate with laces, straps or other fasteners to adjust the fit of the upper around the foot. The bottom portion of the upper is attached to the sole structure at a location proximate the bottom surface of the foot.

[0006] The sole structure generally includes a layered arrangement extending between the ground surface and the upper. One layer of the sole structure includes an outsole that provides wear resistance and adhesion friction with the ground surface. The outsole can be formed by rubber or other materials that impart durability and wear resistance and enhance adhesion friction with the ground surface. Another layer of the sole structure includes a midsole arranged between the outsole and the upper. The midsole provides cushioning for the foot and can be partially formed by a polymer foam material that elastically compresses under an applied load to cushion the foot by weakening the ground reaction force. The midsole can additionally or alternatively be combined with a fluid-filled bladder to provide cushioning for the foot by elastically compressing under an applied load to weaken the ground reaction force. The sole structure can also include an insole or insole that enhances comfort at a position close to the bottom portion of the upper in the cavity, and a midsole cloth attached to the upper and arranged between the midsole and the insole or insole.

[0007] Midsoles that employ fluid-filled bladders typically include recesses that are sized and shaped to receive similarly sized and shaped fluid-filled bladders. The fluid-filled bladders are typically configured to both flex and provide support when elastically compressed under an applied load, such as during locomotion. In this regard, the fluid-filled bladders are typically designed to provide balanced support to the foot with responsive cushioning properties when the bladders are elastically compressed under an applied load. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure.

[0009] Figure 1 is a side view of an article of footwear according to the principles of the present disclosure;

[0010] Figure 2 yes Figure 1 An exploded top perspective view of a sole structure of a shoe;

[0011] Figure 3 yes Figure 1 An exploded bottom perspective view of a sole structure of a shoe;

[0012] Figure 3A yes Figure 1 An exploded bottom perspective view of the sole structure of FIG. 1 showing the rearward protrusion formed as a separate component;

[0013] Figure 3B yes Figure 1 An exploded bottom perspective view of the sole structure of FIG. 1 showing the forward protrusion formed as a separate component;

[0014] Figure 3C yes Figure 1 An exploded bottom perspective view of the sole structure of , showing the forward protrusions and the rearward protrusions formed as separate components;

[0015] Figure 4 yes Figure 1 A front view of a sole structure;

[0016] Figure 5 yes Figure 1 A rear view of a sole structure;

[0017] Figure 6 yes Figure 1 A bottom plan view of a sole structure of a shoe;

[0018] Figure 7 It was taken along Route 7-7 Figure 6 A cross-sectional view of a sole structure;

[0019] Fig. 7A yes Figure 7 A cross-sectional view of the sole structure of FIG. 1 showing the rearward protrusion formed as a separate component;

[0020] Figure 7B yes Figure 7 A cross-sectional view of a sole structure of FIG. 1 showing a forward protrusion formed as a separate component;

[0021] Figure 7C yes Figure 7A cross-sectional view of a sole structure of FIG. 1 showing the forward protrusion and the rearward protrusion formed as separate components;

[0022] Figure 8 It was taken along line 8-8 Figure 6 A cross-sectional view of a sole structure;

[0023] Fig. 9 It was taken along Route 9-9 Figure 6 A cross-sectional view of a sole structure;

[0024] Fig.10 It was taken along line 10-10 Figure 6 A cross-sectional view of a sole structure;

[0025] Fig.11 is a side view of a configuration of an article of footwear in accordance with the principles of the present disclosure;

[0026] Fig.12 yes Fig.11 An exploded top perspective view of a sole structure of a shoe;

[0027] Fig. 12A yes Fig.11 An exploded top perspective view of the sole structure of FIG. 1 showing the rearward protrusion formed as a separate component;

[0028] Fig. 12B yes Fig.11 An exploded top perspective view of the sole structure of FIG. 1 showing the forward protrusion formed as a separate component;

[0029] Fig. 12C yes Fig.11 An exploded top perspective view of a sole structure of , showing the forward protrusions and the rearward protrusions formed as separate components;

[0030] Fig.13 yes Fig.11 An exploded bottom perspective view of a sole structure of a shoe;

[0031] Fig.14 yes Fig.11 A front view of a sole structure;

[0032] Fig.15 yes Fig.11 A rear view of a sole structure;

[0033] Fig.16 yes Fig.11 A bottom plan view of a sole structure of a shoe;

[0034] Fig.17 It was taken along line 17-17 Fig.16 A cross-sectional view of a sole structure;

[0035] Fig.17Ayes Fig.17 A cross-sectional view of the sole structure of FIG. 1 showing the rearward protrusion formed as a separate component;

[0036] Fig. 17B yes Fig.17 A cross-sectional view of a sole structure of FIG. 1 showing a forward protrusion formed as a separate component;

[0037] Fig. 17C yes Fig.17 A cross-sectional view of a sole structure of FIG. 1 showing the forward protrusion and the rearward protrusion formed as separate components;

[0038] Fig.18 It was taken along line 18-18 Fig.16 A cross-sectional view of a sole structure;

[0039] Fig.19 It was taken along line 19-19 Fig.16 A cross-sectional view of a sole structure;

[0040] Fig. 20 It was taken along the 20-20 line. Fig.16 A cross-sectional view of a sole structure;

[0041] Fig.21 is a side view of another configuration of an article of footwear according to the principles of the present disclosure;

[0042] Fig. 22 yes Fig.21 An exploded top perspective view of a sole structure of a shoe;

[0043] Fig.22A yes Fig.21 An exploded top perspective view of the sole structure of FIG. 1 showing the rearward protrusion formed as a separate component;

[0044] Fig. 22B yes Fig.21 An exploded top perspective view of the sole structure of FIG. 1 showing the forward protrusion formed as a separate component;

[0045] Fig. 22C yes Fig.21 An exploded top perspective view of a sole structure of , showing the forward protrusions and the rearward protrusions formed as separate components;

[0046] Fig.23 yes Fig.21 An exploded bottom perspective view of a sole structure of a shoe;

[0047] Fig.23A yes Fig.21 An exploded bottom perspective view of the sole structure of FIG. 1 showing the rearward protrusion formed as a separate component;

[0048] Fig. 23Byes Fig.21 An exploded bottom perspective view of the sole structure of FIG. 1 showing the forward protrusion formed as a separate component;

[0049] Fig.23C yes Fig.21 An exploded bottom perspective view of the sole structure of , showing the forward protrusions and the rearward protrusions formed as separate components;

[0050] Fig.24 yes Fig.21 A front view of a sole structure;

[0051] Fig.25 yes Fig.21 A rear view of a sole structure;

[0052] Fig.26 yes Fig.21 A bottom plan view of a sole structure of a shoe;

[0053] Fig. 27 It was taken along line 27-27 Fig.26 A cross-sectional view of a sole structure;

[0054] Fig.27A yes Fig. 27 A cross-sectional view of the sole structure of FIG. 1 showing the rearward protrusion formed as a separate component;

[0055] Fig.27B yes Fig. 27 A cross-sectional view of a sole structure of FIG. 1 showing a forward protrusion formed as a separate component;

[0056] Fig.27C yes Fig. 27 A cross-sectional view of a sole structure of FIG. 1 showing the forward protrusion and the rearward protrusion formed as separate components;

[0057] Fig.28 It was taken along line 28-28 Fig.26 A cross-sectional view of a sole structure;

[0058] Fig.29 It was taken along line 29-29 Fig.26 A cross-sectional view of a sole structure of a shoe; and

[0059] Fig.30 It was taken along line 30-30 Fig.26 A cross-sectional view of a sole structure;

[0060] Corresponding reference characters indicate corresponding parts throughout the several views. DETAILED DESCRIPTION

[0061] Example configurations will now be described more fully with reference to the accompanying drawings. Example configurations are provided so that the present disclosure will be thorough and will fully convey the scope of the present disclosure to those of ordinary skill in the art. Specific details, such as examples of specific components, devices, and methods, are set forth to provide a thorough understanding of the configurations of the present disclosure. It will be apparent to those of ordinary skill in the art that specific details need not be employed, that example configurations may be embodied in many different forms, and that specific details and example configurations should not be interpreted as limiting the scope of the present disclosure.

[0062] The terms used herein are only to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an", and "the" may also be intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises", "comprising", "including", and "having" are inclusive and thus specify the presence of features, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or groups thereof. The method steps, processes, and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or illustrated unless they are specifically identified as an execution order. Additional or alternative steps may be adopted.

[0063] When an element or layer is referred to as being "on another element or layer," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it may be directly on, engaged to, connected to, attached to, or coupled to another element or layer, or there may be intermediate elements or layers. In contrast, when an element is referred to as being "directly on another element or layer," "directly engaged to," "directly connected to," "directly attached to," or "directly coupled to" another element or layer, there may be no intermediate elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0064] The terms first, second, third, etc. can be used in this article to describe various elements, components, areas, layers and / or sections. These elements, components, areas, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, area, layer or section from another area, layer or section. Terms such as "first", "second" and other numerical terms do not imply order or sequence unless the context clearly indicates. Therefore, the first element, component, area, layer or section discussed below can be referred to as the second element, component, area, layer or section without departing from the teaching of the example configuration.

[0065] In one configuration, a sole structure for an article of footwear includes a heel region, a forefoot region, and a fluid-filled chamber extending from the heel region to the forefoot region. The sole structure also includes a midsole having a first protrusion contacting the fluid-filled chamber at a first contact area in the forefoot region and a second protrusion contacting the fluid-filled chamber at a second contact area in the heel region, the first protrusion being spaced and separated from the second protrusion.

[0066] The sole structure may additionally include one or more of the following optional features. That is, the first protrusion may include a distal end defining a first engagement region that contacts the first contact region, and the second protrusion may include a distal end defining a second engagement region that contacts the second contact region. The first engagement region and the second engagement region may be smaller than a width of the fluid-filled chamber defined between an inner side of the fluid-filled chamber and an outer side of the fluid-filled chamber.

[0067] In one configuration, a void is defined between the first protrusion and the second protrusion.The void may extend from a medial side of the sole structure to a lateral side of the sole structure.

[0068] In one configuration, the midsole includes a substrate extending from a heel region to a forefoot region and including a first surface and a second surface disposed on a side of the substrate opposite the first surface. A first protrusion and a second protrusion extend from one of the first surface and the second surface.

[0069] The sole structure may include an outsole defining a ground engaging surface, the outsole attached to the second surface of the substrate. In another configuration, the sole structure may include a footbed operable to receive a wearer's foot, the second surface of the substrate opposing the footbed.

[0070] In one configuration, the fluid-filled chamber may include a first end that contacts the midsole at a location proximate the front end of the sole structure. Additionally or alternatively, the fluid-filled chamber may include a second end that is spaced apart from the midsole at a location proximate the rear end of the sole structure. The void may extend from the medial side of the sole structure to the lateral side of the sole structure between the first protrusion and the front end of the sole structure.

[0071] In another configuration, a sole structure for an article of footwear includes a heel region, a forefoot region, and a fluid-filled chamber extending from the heel region to the forefoot region. The sole structure also includes a midsole having a first protrusion extending from the midsole in a first direction and contacting the fluid-filled chamber at a first contact area in the forefoot region, and a second protrusion extending from the midsole in a second direction opposite the first direction and contacting the fluid-filled chamber at a second contact area in the heel region.

[0072] The sole structure may include one or more of the following optional features. For example, the first protrusion may include a distal end defining a first engagement region that contacts the first contact region, and the second protrusion may include a distal end defining a second engagement region that contacts the second contact region, the first engagement region and the second engagement region being smaller than a width of the fluid-filled chamber defined between an inner side of the fluid-filled chamber and an outer side of the fluid-filled chamber.

[0073] In one configuration, the sole structure may include a void defined between the first protrusion and the second protrusion, the void extending from a medial side of the sole structure to a lateral side of the sole structure.

[0074] The midsole may include a first substrate extending from a forefoot region to a heel region and including a first surface and a second surface, the second surface being disposed on a side of the first substrate opposite the first surface. The midsole may also include a second substrate extending from the heel region to the midfoot region. The second substrate may include a third surface and a fourth surface, the fourth surface being disposed on a side of the second substrate opposite the third surface. The first protrusion may extend from the second surface in a direction toward a ground engaging surface of the sole structure, and the second protrusion may extend from the third surface in a direction away from the ground engaging surface.

[0075] The sole structure may also include an outsole defining a ground engaging surface. The outsole may be attached to the fourth surface of the second substrate in the heel region and may be attached to the fluid-filled chamber in the forefoot region. The sole structure may also include a footbed operable to receive a foot of a wearer, the first surface of the first substrate opposing the footbed.

[0076] In one configuration, the fluid-filled chamber may include a first end that contacts the midsole at a location proximate the front end of the sole structure. Additionally or alternatively, the fluid-filled chamber may include a second end that is spaced apart from the midsole at a location proximate the rear end of the sole structure. The sole structure may include a void extending from the medial side of the sole structure to the lateral side of the sole structure between the first protrusion and the front end of the sole structure.

[0077] Reference Figure 1 , Fig.11 and Fig.21 , the article of footwear 10 includes an upper 100 and a sole structure 200, 300, 400. The article of footwear 10 can be divided into one or more regions. These regions can include a forefoot region 12, a midfoot region 14, and a heel region 16. The forefoot region 12 can be subdivided into a toe portion 12 corresponding to the phalanges. T and the ball of the foot 12 associated with the metatarsal bones of the foot B Midfoot region 14 may correspond to the arch area of ​​the foot, and heel region 16 may correspond to the rear portion of the foot, including the calcaneus bone.

[0078] The footwear 10 may also include a front end 18 associated with a forward-most point of the forefoot region 12 and a rear end 20 corresponding to a rearward-most point of the heel region 16. F1 The longitudinal axis A extends along the length of the footwear 10 from a front end 18 parallel to the ground surface to a rear end 20. F1 (exist Figure 6 , Fig.16 and Fig.26 ) may be centrally located along the length of the footwear 10 such that the longitudinal axis A F1 The footwear 10 is generally divided into a medial side 22 and a lateral side 24 ( Figure 6 , Fig.16 and Fig.26 Thus, medial side 22 and lateral side 24 correspond to opposite sides of footwear 10 and extend through regions 12, 14, 16, respectively. Figure 6 , Fig.16 , Fig.26 As shown in FIG. 1 , the lateral axis A of the footwear 10 F2 The lateral axis A extends along the width of the footwear 10 from the medial side 22 to the lateral side 24 parallel to the ground surface such that the lateral axis A F2 is arranged perpendicular to the longitudinal axis A F1。 As used herein, the longitudinal direction refers to a direction extending from the front end 18 to the rear end 20 , and the lateral direction refers to a direction transverse to the longitudinal direction and extending from the inner side 22 to the outer side 24 .

[0079] The article of footwear 10, and more specifically, the sole structure 200, 300, 400, can be further described as including a peripheral zone 26 and an interior zone 28. The peripheral zone 26 is generally described as being the zone between the interior zone 28 and the outer perimeter of the sole structure 200, 300, 400. Specifically, the peripheral zone 26 extends from the forefoot region 12 to the heel region 16 along each of the medial side 22 and the lateral side 24, and wraps around each of the forefoot region 12 and the heel region 16. The interior zone 28 is bounded by the peripheral zone 26 and extends from the forefoot region 12 to the heel region 16 along a central portion of the sole structure 200, 300, 400. Thus, each of the forefoot region 12, the midfoot region 14, and the heel region 16 can be described as including the peripheral zone 26 and the interior zone 28.

[0080] The upper 100 includes an interior surface 101 defining an interior cavity 102 that is configured to receive and secure a foot to support on the sole structure 200, 300, 400. The upper 100 may be formed of one or more materials that are stitched or adhesively bonded together to form the interior cavity 102. Suitable materials for the upper 100 may include, but are not limited to, mesh, textiles, foams, leather, and synthetic leather. The materials may be selected and positioned to impart properties of durability, breathability, wear resistance, flexibility, and comfort.

[0081] In some examples, upper 100 includes midsole fabric 104 having a bottom surface opposite sole structure 200, 300, 400 and an opposing top surface of footbed 106 defining interior cavity 102. Stitching or adhesive can secure midsole fabric to upper 100. The contour of footbed 106 can conform to the contour of a bottom surface of a foot (e.g., the sole). Optionally, upper 100 can also incorporate additional layers, such as an insole or sockliner (not shown), which can be disposed on midsole fabric 104. The insole or sockliner can be located within interior cavity 102 of upper 100 and positioned to receive a plantar surface of the foot to enhance the comfort of article of footwear 10. Again, referring to Figure 1 , Fig.11 and Fig.21 Ankle opening 114 in heel region 16 may provide access to interior void 102. For example, ankle opening 114 may receive a foot to secure the foot within interior void 102 and facilitate entry and removal of the foot from interior void 102.

[0082] In some examples, one or more fasteners (not shown) extend along the upper 100 to adjust the fit of the interior cavity 102 around the foot and accommodate entry and exit of the foot. The upper 100 may include holes such as eyelets and / or other engagement features such as fabric or mesh loops that receive the fasteners. The fasteners may include laces, straps, cords, hooks and loops, or any other suitable type of fastener. The upper 100 may include a tongue portion (not shown) extending between the interior cavity 102 and the fasteners.

[0083] The sole structure 200, 300, 400 includes a midsole 202, 302, 402 and a fluid-filled chamber 204 that cooperate with each other to provide cushioning properties to the sole structure 200, 300, 400, and an outsole 206 that provides the ground engaging surface 30 of the article of footwear 10. The fluid-filled chamber 204 extends from the heel region 16 to the forefoot region 12 and has a length L C (exist Figure 7 , Fig.17 , Fig. 27 ), which is shorter than the length L of the midsole 202 M .

[0084] The midsole 202, 302, 402 provides zonal cushioning and performance characteristics and may include a substrate 208, 308, 408. The substrate 208, 308, 408 extends from the heel region 16 to the forefoot region 12 and includes a first surface 208a, 308a, 408a and a second surface 208b, 308b, 408b disposed on a side of the substrate 208, 308, 408 opposite the first surface 208a, 308a, 408a. The midsole 202, 302, 402 may also include a first protrusion 210, 310, 410 and a second protrusion 212, 312, 412 spaced apart from the first protrusion 210, 310, 410 to define a void 214 therebetween. In one aspect, the first protrusion 210, 310, 410, the second protrusion 212, 312, 412 and the substrate 208, 308, 408 are formed as a unitary piece. In another aspect, the first protrusion 210, 310, 410 and / or the second protrusion 212, 312, 412 are formed as separate components, as discussed in more detail below.

[0085] The substrate 208, 308, 408 may be formed of an elastic polymer material such as foam or rubber to impart cushioning, responsiveness, and energy distribution properties to the wearer's foot. The substrate 208, 308, 408 may be independently formed of a single, integral piece of an elastic polymer material, or may be formed of a plurality of elements, each of which is formed of one or more elastic polymer materials. For example, the plurality of elements may be attached to each other using a fusion process, using an adhesive, or by suspending the elements in different elastic polymer materials.

[0086] Example elastic polymer materials for substrates 208, 308, 408 may include those based on foaming or molding one or more polymers, such as one or more elastomers (e.g., thermoplastic elastomers (TPE)). The one or more polymers may include aliphatic polymers, aromatic polymers, or a mixture of the two; and may include homopolymers, copolymers (including terpolymers), or a mixture of the two.

[0087] In some aspects, the one or more polymers may include olefin homopolymers, olefin copolymers, or blends thereof. Examples of olefin polymers include polyethylene, polypropylene, and combinations thereof. In other aspects, the one or more polymers may include one or more ethylene copolymers, such as ethylene-vinyl acetate (EVA) copolymers, EVOH copolymers, ethylene-ethyl acrylate copolymers, ethylene-unsaturated monofatty acid copolymers, and combinations thereof.

[0088] In further aspects, the one or more polymers may include one or more polyacrylates, such as polyacrylic acid, esters of polyacrylic acid, polyacrylonitrile, polyacetic acid esters, polymethyl acrylate, polyethyl acrylate, polybutyl acrylate, polymethyl methacrylate, and polyvinyl acetate; including derivatives thereof, copolymers thereof, and any combination thereof.

[0089] In yet other aspects, the one or more polymers may include one or more ionomer polymers. In these aspects, the ionomer polymer may include a polymer having a carboxylic acid functional group, a sulfonic acid functional group, a salt thereof (e.g., sodium, magnesium, potassium, etc.) and / or anhydrides thereof. For example, the ionomer polymer may include one or more fatty acid modified ionomer polymers, polystyrene sulfonates, ethylene-methacrylic acid copolymers, and combinations thereof.

[0090] In further aspects, the one or more polymers can include one or more styrenic block copolymers, such as acrylonitrile butadiene styrene block copolymers, styrene acrylonitrile block copolymers, styrene ethylene butylene styrene block copolymers, styrene ethylene butadiene styrene block copolymers, styrene ethylene propylene styrene block copolymers, styrene butadiene styrene block copolymers, and combinations thereof.

[0091] In further aspects, the one or more polymers can include one or more polyamide copolymers (e.g., polyamide-polyether copolymers) and / or one or more polyurethanes (e.g., cross-linked polyurethanes and / or thermoplastic polyurethanes). Examples of suitable polyurethanes include those used to form fluid-filled chamber 204 as described below. Alternatively, the one or more polymers can include one or more natural and / or synthetic rubbers, such as butadiene and isoprene.

[0092] When the elastic polymer material is a foamed polymer material, the foamed material can be foamed using a physical foaming agent that changes phase into a gas based on a change in temperature and / or pressure, or a chemical foaming agent that forms a gas when heated above its activation temperature. For example, the chemical foaming agent can be an azo compound such as azodicarbonamide, sodium bicarbonate and / or isocyanate.

[0093] In some embodiments, the foamed polymer material can be a cross-linked foamed material. In these embodiments, a peroxide-based cross-linking agent such as dicumyl peroxide can be used. In addition, the foamed polymer material can include one or more fillers such as pigments, modified or natural clays, modified or unmodified synthetic clays, talc glass fibers, powdered glass, modified or natural silica, calcium carbonate, mica, paper, wood chips, etc.

[0094] The elastic polymer material can be formed using a molding process. In one example, when the elastic polymer material is a molded elastomer, an uncured elastomer (e.g., rubber) can be mixed with an optional filler and a cure package (such as a sulfur-based or peroxide-based cure package) in a Banbury mixer, calendered, shaped, placed in a mold, and vulcanized.

[0095] In another example, when the elastic polymer material is a foamable material, the material can be foamed during a molding process such as an injection molding process. The thermoplastic polymer material can be melted in the barrel of an injection molding system and combined with a physical or chemical foaming agent and an optional cross-linking agent, and then injected into a mold under conditions that activate the foaming agent to form a molded foam.

[0096] Optionally, when the elastic polymer material is a foamed material, the foamed material can be a compression molded foam. Compression molding can be used to change the physical properties of the foam (e.g., density, stiffness and / or hardness), or to change the physical appearance of the foam (e.g., fusing two or more pieces of foam, shaping the foam, etc.), or both.

[0097] The compression molding process is ideally started by forming one or more foam preforms, such as by injection molding and foaming the polymer material, by forming foamed particles or beads, by cutting foamed sheets, etc. The compression molded foam can then be made by placing one or more preforms formed by the foamed polymer material in a compression mold, and applying enough pressure to the one or more preforms to compress the one or more preforms in the closed mold. Once the mold is closed, enough heat and / or pressure is applied to the one or more preforms in the closed mold for a sufficient duration to change the preforms, fuse the individual foam particles to each other, permanently increase the density of the foam, or any combination thereof, by forming a skin on the outer surface of the compression molded foam. After heating and / or applying pressure, the mold is opened and the molded foam article is removed from the mold.

[0098] like Figures 7 to 7C , Figures 17 to 17C , Figures 27 to 27CAs shown in the cross-sectional view of , the fluid-filled chamber 204 can be formed by a pair of opposing barrier layers 216, which can be connected to each other along a peripheral seam 218 to define an internal chamber 220 that forms the overall shape of the fluid-filled chamber 204. Alternatively, the fluid-filled chamber 204 can be produced by any suitable combination of one or more barrier layers 216. As used herein, the term "barrier layer" (e.g., barrier layer 216) covers both single-layer films and multi-layer films. In some embodiments, one or both of the barrier layers 216 are each produced (e.g., thermoformed or blown) from a single-layer film (single layer). In other embodiments, one or both of the barrier layers 216 are each produced (e.g., thermoformed or blown) from a multi-layer film (multiple sub-layers). In either aspect, each layer or sub-layer can have a film thickness ranging from about 0.2 microns to about 1 millimeter. In other embodiments, the film thickness of each layer or sub-layer can range from about 0.5 microns to about 500 microns. In yet further embodiments, the film thickness of each layer or sub-layer may range from about 1 micron to about 100 microns.

[0099] One or both of the barrier layers 216 may be independently transparent, translucent, and / or opaque. As used herein, the term "transparent" for the barrier layer and / or capsule means that light passes through the barrier layer in a substantially straight line and an observer can see through the barrier layer. In contrast, for an opaque barrier layer, light does not pass through the barrier layer, and one cannot clearly see through the barrier layer at all. A translucent barrier layer falls between a transparent barrier layer and an opaque barrier layer because light passes through the translucent layer, but some of the light is scattered, making it impossible for an observer to clearly see through the layer.

[0100] The barrier layers 216 can each be produced from an elastomeric material including one or more thermoplastic polymers and / or one or more cross-linkable polymers. In one aspect, the elastomeric material can include one or more thermoplastic elastomeric materials, such as one or more thermoplastic polyurethane (TPU) copolymers, one or more ethylene-vinyl alcohol (EVOH) copolymers, and the like.

[0101] As used herein, "polyurethane" refers to copolymers (including oligomers) containing carbamate groups (-N(C=O)O-). In addition to carbamate groups, these polyurethanes may also contain additional groups such as esters, ethers, ureas, allophanates, biuret, carbodiimide, oxazolidinyl, isocyanurate, uretdione, carbonate, etc. In one aspect, one or more of the polyurethanes may be produced by polymerizing one or more isocyanates with one or more polyols to produce a copolymer chain having a (-N(C=O)O-) bond.

[0102] Examples of suitable isocyanates for producing polyurethane copolymer chains include diisocyanates such as aromatic diisocyanates, aliphatic diisocyanates, and combinations thereof. Examples of suitable aromatic diisocyanates include toluene diisocyanate (TDI), adducts of TDI and trimethylolpropane (TMP), methylene diphenyl diisocyanate (MDI), xylene diisocyanate (XDI), tetramethyl xylylene diisocyanate (TMXDI), hydrogenated xylene diisocyanate (HXDI), naphthalene 1,5-diisocyanate (NDI), 1,5-tetrahydronaphthalene diisocyanate, p-phenylene diisocyanate (PPDI), 3,3'-dimethyldiphenyl-4,4'-diisocyanate (DDDI), 4,4'-dibenzyl diisocyanate (DBDI), 4-chloro-1,3-phenylene diisocyanate, and combinations thereof. In some embodiments, the copolymer chain is substantially free of aromatic groups.

[0103] In a particular aspect, the polyurethane polymer chain is produced from diisocyanates including HMDI, TDI, MDI, H12 aliphatic compounds, and combinations thereof. In one aspect, the thermoplastic TPU may include polyester-based TPU, polyether-based TPU, polycaprolactone-based TPU, polycarbonate-based TPU, polysiloxane-based TPU, or combinations thereof.

[0104] On the other hand, the polymer layer can be formed from one or more of the following: EVOH copolymers, poly(vinyl chloride), polyvinylidene polymers and copolymers (e.g., polyvinylidene chloride), polyamides (e.g., amorphous polyamides), amide-based copolymers, acrylonitrile polymers (e.g., acrylonitrile-methyl acrylate copolymers), polyethylene terephthalate, polyetherimides, polyacrylimides, and other polymer materials known to have relatively low gas permeabilities. Blends of these materials and blends with the TPU copolymers described herein (and optionally including combinations of polyimides and crystalline polymers) are also suitable.

[0105] The barrier layer 216 may include two or more sublayers (multilayer films), such as shown in U.S. Pat. Nos. 5,713,141 to Mitchell et al. and 5,952,065 to Mitchell et al., the disclosures of which are incorporated herein by reference in their entirety. In embodiments where the barrier layer 216 includes two or more sublayers, examples of suitable multilayer films include microlayer films, such as those disclosed in U.S. Pat. No. 6,582,786 to Bonk et al., which is incorporated herein by reference in its entirety. In further embodiments, the barrier layers 216 may each independently include alternating sublayers of one or more TPU copolymer materials and one or more EVOH copolymer materials, wherein the total number of sublayers in each of the barrier layers 216 includes at least four (4) sublayers, at least ten (10) sublayers, at least twenty (20) sublayers, at least forty (40) sublayers, and / or at least sixty (60) sublayers.

[0106] The fluid-filled chamber 204 can be produced from the barrier layer 216 using any suitable technique, such as thermoforming (e.g., vacuum thermoforming), blow molding, extrusion, injection molding, vacuum molding, rotational molding, transfer molding, pressure molding, heat sealing, casting, low pressure casting, spin casting, reaction injection molding, radio frequency (RF) welding, etc. In one aspect, the barrier layer 216 can be produced by co-extrusion and then by vacuum thermoforming to form the contour of the fluid-filled chamber 204, which can optionally include one or more valves (not shown) that allow the fluid-filled chamber 204 to be filled with a fluid (e.g., a gas).

[0107] Fluid-filled chamber 204 desirably has a low gas permeability to maintain the gas pressure it holds. In some embodiments, fluid-filled chamber 204 has a gas permeability to nitrogen that is at least about ten (10) times lower than the nitrogen permeability of a butyl rubber layer of substantially the same size. In one aspect, fluid-filled chambers 106a, 106b have a gas permeability of 15 cubic centimeters per square meter • atmosphere • day (cm3) for an average film thickness of 500 microns (based on the thickness of barrier layer 216). 3 / m 2 •atm•day) or less. In another aspect, the nitrogen permeability is 10 cm 3 / m 2 •atm•day or less, 5 cm 3 / m 2 •atm•day or less, or 1 cm 3 / m 2 •atm•day or less.

[0108] In the illustrated embodiment, barrier layer 216 includes a first upper barrier layer that forms a top side 204 a of fluid-filled chamber 204 and a second lower barrier layer that forms a bottom side 204 b of fluid-filled chamber 204 .

[0109] Reference now Figures 1 to 10 In one configuration, midsole 202 is disposed between upper 100 and fluid-filled chamber 204, and outsole 206 is attached to bottom side 204b of fluid-filled chamber 204 on a side of fluid-filled chamber 204 opposite midsole 202. First protrusion 210 and second protrusion 212 extend from midsole 202 toward outsole 206 and contact fluid-filled chamber 204. Fluid-filled chamber 204 has a generally constant thickness T C ,like Figure 7 The front end 18 and the rear end 20 of the fluid-filled chamber 204 are arc-shaped and extend in a direction toward the upper 100, and a portion of the fluid-filled chamber 204 between the front end 18 and the rear end 20 is generally flat. Figure 7 As shown, the second surface 208 b of the substrate 208 is spaced apart from the top side 204 a of the fluid-filled chamber 204 and is generally opposite the planar portion of the fluid-filled chamber 204 .

[0110] Reference now Figure 2 , provides an exploded top perspective view of the sole structure 200. The first surface 208a of the substrate 208 includes a lip portion 222 that defines the periphery of the substrate 208. The lip portion 222 includes an arcuate surface that defines a recess 226 for receiving the bottom of the foot. The lip portion 222 includes a base portion 224 disposed on the front end 18 of the substrate 208. The base portion 224 is a base portion 224 having a depth less than the thickness T of the outsole 206. O and receives a portion of the outsole 206.

[0111] Reference now Figure 3 , an exploded bottom perspective view of the sole structure 200 is provided. Figure 3 The configuration of the outsole 200 is depicted in which the midsole 202 is formed as a single piece. Specifically, the first protrusion 210 and the second protrusion 212 are molded to the second surface 208b of the substrate 208 and extend from the second surface 208b by the thickness T of the first protrusion 210. FP and the thickness T of the second protrusion 212 SP Limited distance (in Figure 7210a, 210b). The first protrusion 210 may include a medial first protrusion 210a disposed on the medial side 22 of the sole structure 200 and a lateral first protrusion 210b disposed on the lateral side 24 of the sole structure 200. The medial first protrusion 210a and the lateral first protrusion 210b are spaced apart from each other in a direction across the width of the sole structure 200 (i.e., between the medial side 22 and the lateral side 24). A toe support 228 is formed on the second surface 208b at the front end 18 of the midsole 202 in front of the protrusions 210a, 210b. The toe support 228 is spaced apart from the first protrusion 210 and includes a wall portion 230 that is generally disposed perpendicular to the second surface 208b of the substrate 208. The height H of the wall portion 230 is ? W Typically, the thickness T of the fluid-filled chamber 204 C same.

[0112] The second protrusion 212 is disposed on the second surface 208b of the substrate 208 within the heel region 16 of the midsole 202. The medial first protrusion 210a, the lateral first protrusion 210b, and the second protrusion 212 are truncated pyramids, so that each of the medial first protrusion 210a, the lateral first protrusion 210b, and the second protrusion 212 includes a substantially truncated cone shape. The medial first protrusion 210a and the lateral first protrusion 210b can be smaller than the second protrusion 212 and can extend between the medial side 22 and the lateral side 24 of the substrate 208. Similarly, the second protrusion 212 can extend between the medial side 22 and the lateral side 24 of the substrate 208 and be spaced apart from the medial first protrusion 210a and the lateral first protrusion 210b. The distal ends of the medial first protrusion 210a, the lateral first protrusion 210b, and the second protrusion 212 are schematically shown as being planes and defining respective first and second engagement areas 232 and 234. First engagement area 232 and second engagement area 234 are configured to contact fluid-filled chamber 204 at respective first contact area 236 located in forefoot area 12 of fluid-filled chamber 204 and second contact area 238 located in heel area 16 of fluid-filled chamber 204. First engagement area 232 and second engagement area 234 are smaller than a width W of fluid-filled chamber 204. C ,like Figure 8 and Fig.10 shown.

[0113] Reference now Figures 4 to 7 and Figures 8 to 10 , provides a depiction of the sole structure 200 in an assembled state. Figure 4 and Figure 5, the outsole 206 includes a toe portion 240 disposed on the front end 18 of the outsole 206. The toe portion 240 is generally curved, is seated within the base portion 224 of the substrate 208, and extends outside the substrate 208. The fluid-filled chamber 204 is open to the environment so that compression of the fluid-filled chamber 204 by the first protrusion 210 and the second protrusion 212 during use is easily visible.

[0114] Reference now Figure 7 , midsole 202 is attached to fluid-filled chamber 204, and bottom side 204b of fluid-filled chamber 204 is attached to interior surface 32 of outsole 206. Second surface 208b of substrate 208 is spaced apart from top side 204a of fluid-filled chamber 204 between first protrusion 210 and second protrusion 212. First contact area 236 and second contact area 238 of fluid-filled chamber 204 are spaced apart from each other along the length of fluid-filled chamber 204 and are disposed on top side 204a of fluid-filled chamber 204. First engagement area 232 and second engagement area 234 are flush with respective first contact area 236 and second contact area 238 and may be attached thereto by a suitable adhesive. Wall portion 230 is generally arcuate and attached to a front end of fluid-filled chamber 204. Wall portion 230 is spaced apart from a rear end 20 of midsole 202 generally by a length L of fluid-filled chamber 204. C Quite a distance.

[0115] exist Figures 1 to 10 2, first protrusion 210 and second protrusion 212 are driven into fluid-filled chamber 204 in a direction from upper 100 to outsole 206 to impart a load onto fluid-filled chamber 204. Specifically, during use, the weight of a user drives first engagement area 232 of first protrusion 210 into first contact area 236 and drives second engagement area 234 of second protrusion 212 into second contact area 238. Thus, midsole 202 carries fluid-filled chamber 204 at first contact area 236 and second contact area 238 of top side 204a of fluid-filled chamber 204, with the remainder of top side 204a of fluid-filled chamber 204 being spaced apart and separated from midsole 202. In this way, first protrusion 210 and second protrusion 212 apply a focused point load on top side 204a of fluid-filled chamber 204. In doing so, the point loading effectively concentrates the force from the wearer over a relatively small area of ​​the fluid-filled chamber 204 , thereby reducing the force required to deform the fluid-filled chamber 204 compared to the same force applied over a larger surface area of ​​the fluid-filled chamber 204 .

[0116] Reference now Figure 3A and Fig. 7AIn one configuration, the second protrusion 212 is formed separately from the midsole 202a. In this configuration, the second surface 208b of the substrate 208 includes the medial first protrusion 210a and the lateral first protrusion 210b formed integrally with the substrate 208 at the forefoot region 12, and Figure 3 2. However, the second surface 208b of the substrate 208 at the heel region 16 is smooth and uninterrupted (ie, without integrally formed protrusions).

[0117] like Figure 3A As shown, the second protrusion 212 is a first bladder 242 and can be formed using the same materials and methods as described above with respect to the fluid-filled chamber 204. Preferably, the thickness T of the first bladder 242 is B1 and Figure 7 The thickness T of the second protrusion 212 shown in SP In this configuration, the first bladder 242 is schematically shown as a cube with rounded edges. However, it should be understood that the first bladder 242 can be shaped similar to Figure 3 The first bladder 242 may be secured to the second surface 208b of the substrate 208 at the heel region 16, generally in contact with the Figure 3 The same position of the second protrusion 212 is shown in FIG.

[0118] Although second surface 208b of substrate 208 is shown as generally planar at heel region 16, second surface 208b may include a recess at heel region 16 to receive first bladder 242. As shown, first bladder 242 may include a first surface 242a opposite second surface 242b, wherein first surface 242a and second surface 242b are both substantially planar. First surface 242a may contact second surface 208b of substrate 208 and may be attached thereto by a suitable adhesive. Second surface 242b may define second engagement region 234 and may contact second contact region 238 of fluid-filled chamber 204.

[0119] Reference now Figure 3B and Figure 7B In one configuration, the first protrusion 210 is formed separately from the midsole 202b. In this configuration, the second surface 208b of the substrate 208 includes a second protrusion 212 integrally formed with the substrate 208 at the heel region 16. Figure 3The second surface 208b of the substrate 208 at the forefoot region 12 is generally flat. The first protrusions 210 (including the medial first protrusion 210a and the lateral first protrusion 210b) include a medial second bladder 244a and a lateral second bladder 244b. The medial second bladder 244a and the lateral second bladder 244b can be formed using the same materials and methods as the fluid-filled chamber 204 described above. Preferably, the thickness T of the medial second bladder 244a is MB The thickness T of the inner first protrusion 210a is SP The thickness T of the outer second bladder 244b is equal to LB and Figure 3 The thickness T of the outer first protrusion 210b shown in SP The inner second bladder 244a and the outer second bladder 244b are schematically shown as being a cube with rounded edges. However, it should be understood that the inner second bladder 244a and the outer second bladder 244b can be shaped similar to Figure 3 The medial second bladder 244a and the lateral second bladder 244b may be secured to the second surface 208b of the substrate 208 at the forefoot region 12, generally at a position similar to the first protrusion 210 shown in FIG. Figure 3 The medial first protrusion 210a and the lateral first protrusion 210b are shown in the same position. The top surfaces of the medial second bladder 244a and the lateral second bladder 244b define the first engagement area 232 and engage the first contact area 238 disposed on the top side 204a of the outsole 204.

[0120] Reference now Figure 3C and Figure 7C , the midsole 202c, the first protrusion 210, and the second protrusion 212 are shown as being formed as separate components. In this configuration, the second surface 208b of the substrate 208 is generally planar from the forefoot region 12 to the heel region 16. The second protrusion 212 is a first bladder 242, and the first protrusion 210 (i.e., the medial first protrusion 210a and the lateral first protrusion 210b) include a medial second bladder 244a and a lateral second bladder 244b. The first bladder 242 is larger than each of the medial second bladder 244a and the lateral second bladder 244b. The first bladder 242, the medial second bladder 244a, and the lateral second bladder 244b are schematically shown as being truncated pyramids having the same dimensions as described above with respect to Figure 3The first bladder 242 is larger than the medial second bladder 244a and the lateral second bladder 244b and can be pressurized to the same or different pressure than at least one of the medial second bladder 244a and the lateral second bladder 244b. The medial second bladder 244a and the lateral second bladder 244b are shown as being generally the same size and can be pressurized to the same or different pressures. The medial second bladder 244a and the lateral second bladder 244b can be secured to the second surface 208b of the substrate 208 at the forefoot region 12, generally at the same pressure as the first bladder 242. Figure 3 Similarly, the first bladder 242 can be fixed to the second surface 208b of the substrate 208 at the heel area 16, generally at the same position as the corresponding medial first protrusion 210a and lateral first protrusion 210b shown in FIG. Figure 3 The same position of the second protrusion 212 is shown in FIG.

[0121] Figures 1 to 10 23. The first protrusion 210 and the second protrusion 212 shown in FIG. 23 are configured to generate a load on the top side 204a of the fluid-filled chamber 204 at the first contact area 236 and the second contact area 238. The first engagement area 232 of the first protrusion 210 and the second engagement area 234 of the second protrusion 212 contact the fluid-filled chamber 204 to space the second surface 208b of the substrate 208 from the fluid-filled chamber 204. In doing so, a void 214 separating the first protrusion 210 from the second protrusion 212 is defined and extends through the sole structure 200 from the medial side 22 to the lateral side 24. Thus, the sole structure 200 allows radial displacement of the midsole 200 around the first protrusion 210 and the second protrusion 212. In addition, the sole structure 200 is relatively free to flex along the portion of the midsole 202, 202a, 202b, 202c above the void 214.

[0122] exist Figures 11 to 20 In the configuration of the sole structure 300 shown in FIG. 1 , the outsole 206 and the fluid-filled chamber 204 are connected to the Figures 1 to 10 206 and fluid-filled chamber 204 are substantially identical. Sole structure 300 includes midsole 302 having substrate 308 attached to outsole 206 and disposed between outsole 206 and fluid-filled chamber 204. Substrate 308 includes first surface 308a and second surface 308b formed on a side of substrate 308 opposite first surface 308a. Interior surface 32 of outsole 204 is attached to second surface 308b of substrate 308, as shown in FIG. Fig.17 shown.

[0123] Midsole 302 includes first protrusion 310 and second protrusion 312 that extend away from outsole 206 toward fluid-filled chamber 204 and in a direction toward upper 100. As such, fluid-filled chamber 204 is disposed above substrate 308 of midsole 302 and contacts first protrusion 310 and second protrusion 312. First contact area 236 and second contact area 238 are disposed on bottom side 204b of fluid-filled chamber 204 rather than on top side 204a, as described and illustrated in conjunction with sole structure 200. The weight of a user drives first contact area 236 and second contact area 238 of fluid-filled chamber 204 into engagement with first engagement area 332 of first protrusion 310 and second engagement area 334 of second protrusion 312. Thus, midsole 302 carries fluid-filled chamber 204 at first contact area 236 and second contact area 238 of bottom side 204 b of fluid-filled chamber 204 , with the remainder of bottom side 204 b of fluid-filled chamber 204 being spaced apart and separated from midsole 302 .

[0124] Reference now Fig.12 and Fig.13 In one configuration of the sole structure 300, the first protrusion 310 and the second protrusion 312 are disposed on the first surface 308a of the substrate 308. In this configuration, the first protrusion 310 and the second protrusion 312 are integrally formed with the substrate 308 to define an integral structure. A toe support 328 is formed on the first surface 308a at the front end 18 of the midsole 302. The toe support 328 is spaced apart from the first protrusion 310 and includes a wall portion 330 that is generally disposed perpendicular to the first surface 308a of the substrate 308.

[0125] The sole structure 300 may include a bottom plate 348 having a stiffness greater than that of the substrate 308. In this configuration, the second surface 308b of the substrate 308 may include a plate recess 350 having a depth and a periphery that receives the bottom plate 348 in a flush manner such that the periphery of the plate recess 350 defines the periphery of the bottom plate 348 and the outer surface of the bottom plate 348 is flush with the second surface 308b of the substrate 308.

[0126] Sole structure 300 also includes lip portion 322 and liner 352 attached to top side 204a of fluid-filled chamber 204. Lip portion 322 is a closed-loop band that defines the periphery of fluid-filled chamber 204 and is open at its center. Liner 352 is sized to fill the open center of lip portion 322, and the thickness of liner 352 is comparable to the thickness of the interior of lip portion 322 to form a flush, continuous surface, such as Fig.19As shown. The lip portion 322 and the liner 352 form a recess 326 for receiving the bottom of the foot in a manner similar to the recess 226 described above. The lip portion 322 includes a base portion 324 disposed on the front end 18 of the lip portion 322. The base portion 324 is a base portion having a depth less than the thickness T of the outsole 206. O The outsole 206 includes a toe portion 240 disposed on the front end 18 of the outsole 206. The toe portion 240 is generally arc-shaped, is located within the base portion 324 of the lip portion 322, and extends beyond the outer surface of the lip portion 322.

[0127] Reference now Figures 14 to 17 and Figures 18 to 20 , provides a depiction of sole structure 300 in an assembled state. In the assembled state, fluid-filled chamber 204 is visible and open to the environment, making compression of fluid-filled chamber 204 by first protrusion 210 and second protrusion 212 easily visible during use.

[0128] Reference now Fig.17 , first surface 308a of substrate 308 is shown as being spaced apart from bottom side 204b of fluid-filled chamber 204. First contact area 236 and second contact area 238 are spaced apart from each other along the length of fluid-filled chamber 204 and are disposed on bottom side 204b of fluid-filled chamber 204. First engagement area 332 and second engagement area 334 are flush with respective first contact areas 236 and second contact areas 238. Wall portion 330 is generally arcuate and receives the front end of fluid-filled chamber 204 in a flush manner. Wall portion 330 is spaced apart from rear end 20 of midsole 302 by a length L of fluid-filled chamber 204. C Quite a distance.

[0129] exist Figures 11 to 20 , fluid-filled chamber 204 is driven into first protrusion 310 and second protrusion 312 to impart a load on fluid-filled chamber 204. Specifically, the weight of the wearer drives first contact area 236 of fluid-filled chamber 204 into first engagement area 332 of first protrusion 310, and drives second contact area 238 of fluid-filled chamber 204 into second engagement area 334 of second protrusion 312. Thus, midsole 302 carries fluid-filled chamber 204 at first contact area 236 and second contact area 238 of bottom side 204b of fluid-filled chamber 204, with the remainder of bottom side 204b of fluid-filled chamber 204 being spaced apart and separated from midsole 302.

[0130] Reference now Fig. 12A and Fig.17AIn one configuration of the midsole 302a, the second protrusion 312 is formed as a separate component from the midsole 302a. The first surface 308a of the substrate 308 includes the first protrusions 310 (including the medial first protrusion 310a and the lateral first protrusion 310b). In this configuration, the medial first protrusion 310a and the lateral first protrusion 310b are formed integrally with the substrate 308 at the forefoot region 12, and Fig.12 1. The first surface 208a of the substrate 308 at the heel region 16 is generally smooth and uninterrupted. As shown, the second protrusion 312 is a first bladder 342, which is attached to the smooth surface of the substrate 308 at the heel region 16 by a suitable adhesive. The first bladder 342 can be formed using the same materials and methods as described above with respect to the fluid-filled chamber 204. Preferably, the thickness T of the first bladder 342 is 1.5 mm. B1 and Fig.12 The thickness T of the second protrusion 312 shown in SP The first bladder 342 is schematically shown as a cube with rounded edges. However, it should be understood that the first bladder 342 can be shaped similar to Fig.12 A similar truncated pyramid is shown in FIG. 1 with respect to the second protrusion 312. The first bladder 342 may be secured to the first surface 308b of the substrate 308 at the heel region 16, generally in contact with the first surface 308b of the substrate 308. Fig.12 The same position of the second protrusion 312 is shown in FIG.

[0131] It should be understood that while the first surface 308a of the substrate 308 is shown as being generally planar at the heel region 16, the first surface 308a may include a recess at the heel region 16 to receive the first bladder 342. The first bladder 342 includes a first planar surface 342a that is opposite a second planar surface 342b. The second surface 342b contacts and can be attached to the first surface 308a of the substrate 308 via a suitable adhesive, and the first surface 342a defines a second engagement area 334 and contacts and can be attached to the second contact area 238 of the outsole 206 via the same or different adhesive.

[0132] Reference now Fig. 12B and Fig. 17B In one configuration of the midsole 302b, the first protrusion 310 is formed as a separate component from the midsole 302b. The first surface 308a of the substrate 308 includes a second protrusion 212 integrally formed with the substrate 308 at the heel region 16. Fig.12302 shown in FIG. 304. The first surface 308a of the substrate 308 at the forefoot region 12 is generally flat. The first protrusions 310 (i.e., the medial first protrusion 310a and the lateral first protrusion 310b) include a medial second bladder 344a and a lateral second bladder 344b. The medial second bladder 344a and the lateral second bladder 344b can be formed using the same materials and methods as the fluid-filled chamber 204 described above. Preferably, the thickness T of the medial second bladder 344a is 1.5 mm. MB The thickness T of the inner first protrusion 310a is SP The thickness T of the outer second bladder 344b is equal to LB and Fig.12 The thickness T of the outer first protrusion 210b shown in SP The inner second bladder 344a and the outer second bladder 344b are schematically shown as being in a cubic shape with rounded edges. However, it should be understood that the inner second bladder 344a and the outer second bladder 344b may be shaped similarly to the embodiment of the present invention. Fig.12 The medial second bladder 344a and the lateral second bladder 344b may be secured to the first surface 308a of the substrate 308 at the forefoot region 12 by a suitable adhesive, typically at a position similar to the truncated pyramid shown in FIG. Fig.12 The medial second bladder 344a and the lateral second bladder 344b may be secured to the second surface 308b of the substrate 308 at the forefoot region 12, generally at the same position as the corresponding medial first protrusion 310a and the lateral first protrusion 310b shown in FIG. Fig.12 The top surfaces of the medial second bladder 344a and the lateral second bladder 344b define the first engagement area 332 and engage the first contact area 238 disposed on the bottom side 204b of the outsole 204.

[0133] Reference now Fig. 12C and Fig. 17C In one configuration of the midsole 302c, the first protrusion 310 and the second protrusion 312 are formed as separate components from the midsole 302c. The first surface 308a of the substrate 308 is generally flat from the forefoot region 12 to the heel region 16. The second protrusion 312 is a first bladder 342, and the first protrusion 310 (including the medial first protrusion 310a and the lateral first protrusion 310b) includes a medial second bladder 344a and a lateral second bladder 344b. The first bladder 342 is larger than each of the medial second bladder 344a and the lateral second bladder 344b. The first bladder 342, the medial second bladder 344a, and the lateral second bladder 344b are formed to be similar to the above-mentioned Fig.12The first protrusion 310 and the second protrusion 312 are illustrated and described in a similar manner as being truncated pyramids. The first bladder 342 is larger than the medial second bladder 344a and the lateral second bladder 344b, and may include the same or different pressure as at least one of the medial second bladder 344a and the lateral second bladder 344b. The medial second bladder 344a and the lateral second bladder 344b are illustrated as being generally the same size and may include the same or different pressure as one another. The medial second bladder 344a and the lateral second bladder 344b may be secured to the first surface 308a of the substrate 308 at the forefoot region 12 by a suitable adhesive, typically in the same position as the medial first protrusion 310a and the lateral first protrusion 310b, respectively. Similarly, the first bladder 342 may be secured to the first surface 308a of the substrate 308 at the heel region 16 by a suitable adhesive, typically in the same position as the medial first protrusion 310a and the lateral first protrusion 310b, respectively. Fig.12 The same position of the second protrusion 312 is shown in FIG.

[0134] Figures 11 to 20 312 is configured to generate a load on the bottom side 204b of the fluid-filled chamber 204 at first contact areas 236 and second contact areas 238 by pressing the bottom side 204b of the fluid-filled chamber 204 into the first protrusions 310 and the second protrusions 312. The first engagement areas 232 of the first protrusions 210 and the second engagement areas 234 of the second protrusions 212 contact the fluid-filled chamber 204 at discrete locations to separate the first surface 308a of the substrate 308 from the fluid-filled chamber 204. As such, the voids 214 separating the first protrusions 310 from the second protrusions 312 also define a cavity between the fluid-filled chamber 204 and the first surface 308a of the substrate 308 that extends through the sole structure 300 from the medial side 22 to the lateral side 24. Thus, the sole structure 300 allows radial displacement of the midsole 302 about the first protrusions 310 and the second protrusions 312. Furthermore, sole structure 300 flexes relatively freely along the portion of midsole 202 above void 214 .

[0135] exist Figures 21 to 30 In the configuration of the sole structure 400 shown in FIG. Figures 1 to 204. The outsole 206 shown in FIG. 4 is substantially the same. The sole structure 400 includes a midsole 402 having a first substrate 408 and a second substrate 454, the second substrate 454 being spaced apart and separated from the first substrate 408. The first substrate 408 includes a first surface 408a and a second surface 408b, the second surface 408b being formed on a side of the first substrate 408 opposite the first surface 408a. The first surface 408a defines the top of the substrate 408. The second substrate 454 includes a third surface 454a and a fourth surface 454b, the fourth surface 454b being formed on a side of the second substrate 454 opposite the third surface 454a. The third surface 454a defines the top of the second substrate 454, and the fourth surface 454b defines the bottom of the second substrate 454. The first substrate 408 extends the length of the sole structure 400 from the forefoot region 12 to the heel region 16, and the second substrate 454 extends from the heel region 16 to the midfoot region 14 of the sole structure 400.

[0136] Fluid-filled chamber 204 is disposed between first substrate 408 and second substrate 454. Fluid-filled chamber 204 includes a top side 204a defining a top of fluid-filled chamber 204 and a bottom side 204b disposed on a side of fluid-filled chamber 204 opposite top side 204a. First contact area 236 is disposed in forefoot region 12 and on top side 204a of fluid-filled chamber 204. Second contact area 238 is disposed in heel region 16 and on bottom side 204b of fluid-filled chamber 204, such that contact areas 236, 238 are disposed on opposite sides of fluid-filled chamber 204.

[0137] Reference now Fig. 27 , fluid-filled chamber 204 includes forefoot portion 205, midfoot portion 207, and heel portion 209. Midfoot portion 207 connects forefoot portion 205 to heel portion 209. Heel portion 209 is elevated relative to forefoot portion 205, thereby causing midfoot portion 207 to be angled relative to forefoot portion 205 and heel portion 209. In this manner, midfoot portion 207 serves as a transition between forefoot portion 205 and elevated heel portion 209 and defines an arcuate section of fluid-filled chamber 204, as shown in FIG. Fig. 27 shown.

[0138] Midsole 302 also includes first protrusion 410 and second protrusion 412. First protrusion 410 may be disposed on first substrate 408, extend in a first direction, and contact fluid-filled chamber 204 at first contact area 236. Second protrusion 412 may be disposed on second substrate 454, extend in a second direction opposite to the first direction, and contact fluid-filled chamber 204 at second contact area 238.

[0139] In one configuration, the first protrusions 410 include inner first protrusions 410a and outer first protrusions 410b. The inner first protrusions 410a, the outer first protrusions 410b, and the second protrusions 412 are truncated pyramids having a truncated cone shape, which are integrally formed with the respective first and second substrates 408, 454.

[0140] The medial first protrusion 410a and the lateral first protrusion 410b are generally the same size as each other and smaller in size than the second protrusion 412. The first protrusion 410 extends from the second surface 408b of the first substrate 408 in a direction toward the ground engaging surface 30 of the sole structure 400, and the second protrusion extends from the third surface 454a of the second substrate 454 in a direction away from the ground engaging surface 30. The distal end of the first protrusion 410 defines a first engagement area 432, and the distal end of the second protrusion 412 defines a second engagement area 434. The first engagement area 432 engages the first contact area 236 of the outsole 206, and the second engagement area 434 engages the second contact area 238 of the outsole 206. Fig.28 and Fig.30 As shown, first land 432 and second land 434 are smaller than a width W of fluid-filled chamber 204 defined between inner side 22 of fluid-filled chamber 204 and outer side 24 of fluid-filled chamber 204 . C .

[0141] like Fig.21 and Figures 27 to 30 4. As shown, first surface 408a of substrate 408 is opposite to footbed 106. Outsole 206 is attached to fourth surface 454b of second substrate 454 in heel region 16 and to bottom side 204b of forefoot portion 205 of fluid-filled chamber 204 in forefoot region 12 of sole structure 400. In heel region 16 of sole structure 400, heel portion 209 of fluid-filled chamber 204 is disposed between second substrate 454 and first substrate 408. In midfoot region 14 of sole structure 400, fluid-filled chamber 204 is disposed with void 214 extending between medial side 22 and lateral side 24 of sole structure 400 and between first protrusion 410 and second protrusion 412. Fluid-filled chamber 400 is also disposed between first substrate 408 and second substrate 454 in midfoot region 14 of sole structure 400. In forefoot region 12 , fluid-filled chamber 204 is disposed between outsole 206 and first substrate 408 .

[0142] Reference now Fig.23 , a toe support 428 is formed on the second surface 408b at the front end 18 of the first substrate 408. The toe support 428 is spaced apart from the first protrusion 410 and includes a wall portion 430 that is generally perpendicular to the second surface 408b of the substrate 408. The height H of the wall portion 430 isW Typically, the thickness T of the fluid-filled chamber 204 C same.

[0143] The sole structure 400 may include a bottom plate 448. The rigidity of the bottom plate 448 may be greater than the rigidity of the second substrate 454. The fourth surface 454b of the second substrate 454 may include a plate recess 450 having a depth and a periphery, the plate recess 450 receiving the bottom plate 448 in a flush manner, such that the periphery of the plate recess 450 defines the periphery of the bottom plate 448, and the outer surface of the bottom plate 448 is flush with the fourth surface 454b of the second substrate 454.

[0144] The sole structure 400 may also include a top plate 456. The top plate 456 may be formed of the same or different material as the bottom plate 448 and may have a similar stiffness as the bottom plate 448. The first surface 408a of the first substrate 408 may include a top plate recess 458 having a depth and a periphery that receives the top plate 456 in a flush manner such that the periphery of the top plate recess 458 defines the periphery of the top plate 456 and the top surface of the top plate 456 is flush with the first surface 408a of the first substrate 408.

[0145] The sole structure 400 may also include a lip portion 422 that defines the periphery of the first substrate 408. The lip portion 422 may include an arcuate surface that defines a recess 426 for receiving the bottom of the foot in a manner similar to the recess 226 described above. The lip portion 422 includes a base portion 424 disposed on the front end 18 of the first substrate 408. The base portion 424 is a base portion 424 having a depth less than the thickness T of the outsole 206. O The outsole 206 includes a toe portion 240 disposed on the front end 18 of the outsole 206. The toe portion 240 is generally arc-shaped, is located within the base portion 224 of the substrate 208, and extends outside the substrate 208.

[0146] Reference now Figures 14 to 17 and Figures 18 to 20 , provides a depiction of sole structure 300 in an assembled state. Fluid-filled chamber 204 is visible and open to the environment, such that compression of fluid-filled chamber 204 by first protrusion 210 and second protrusion 212 is easily visible.

[0147] Reference now Fig. 27, second surface 408b of substrate 408 contacts top side 204a of fluid-filled chamber 204 at heel region 205 of fluid-filled chamber 204. First contact area 236 and second contact area 238 are spaced apart from each other along the length of fluid-filled chamber 204. First contact area 236 is disposed on top side 204a of fluid-filled chamber 204, and second contact area 238 is disposed on bottom side 204b of fluid-filled chamber 204. First joining area 332 and second joining area 333 are flush with respective first contact areas 236 and second contact areas 238 and may be attached thereto by a suitable adhesive. Wall portion 430 is generally arcuate and receives the front end of fluid-filled chamber 204 in a flush manner. Wall portion 430 is spaced apart from rear end 20 of midsole 402 generally by length L of fluid-filled chamber 204. C Thus, the front end (i.e., first end) of fluid-filled chamber 204 contacts midsole 402 at a position proximate to front end 18 of sole structure 400, and the rear end (i.e., second end) of fluid-filled chamber 204 is spaced apart from second substrate 454 of midsole 402 at a position proximate to rear end 20 of sole structure 400.

[0148] Reference now Fig.22A , Fig.23A and Fig.27A In one configuration of the midsole 402a, the second protrusion 412 is formed as a separate component from the second substrate 454. The second surface 408b of the first substrate 408 includes the medial first protrusion 410a and the lateral first protrusion 410b. The medial first protrusion 410a and the lateral first protrusion 410b are integrally formed with the forefoot region 12 and are connected to the second substrate 454. Fig.23 4. The second surface 408b of the first substrate 408 at the heel region 16 is smooth and uninterrupted. The second protrusion 412 is a first bladder 442, which can be formed using the same materials and methods as the fluid-filled chamber 204 described above. Preferably, the thickness T of the first bladder 442 is B1 and Fig. 22 The thickness T of the second protrusion 412 shown in SP The first bladder 442 is schematically shown as a cube with rounded edges. However, it should be understood that the first bladder 442 can be shaped similar to Fig. 22 The first bladder 442 may be secured to the third surface 454a of the second substrate 454 at the heel region 16, generally at a position similar to the second protrusion 412 shown in FIG. Fig. 22 The same position of the second protrusion 412 is shown in FIG.

[0149] It should be understood that although the third surface 454a of the second substrate 454 is shown as being generally planar at the heel region 16, the third surface 454a may include a recess at the heel region 16 to receive the first bladder 442. The first bladder 442 includes a first surface 442a opposite the second surface 442b. The first surface 442a and the second surface 442b are illustratively shown as being planar surfaces. The second surface 442b contacts and can be fixed to the third surface 454a of the second substrate 454, and the first surface 442a defines the second engagement area 434 and contacts the second contact area 238 of the outsole 206.

[0150] Reference now Fig. 22B , Fig. 23B and Fig.27B In one configuration of the midsole 402b, the first protrusion 410 is formed as a separate component. The third surface 454a of the second substrate 454 includes a second protrusion 412 integrally formed with the second substrate 454 at the heel region 16. Fig. 22 4. The second surface 408b of the first substrate 408 is continuous from the front end 18 to the rear end 20. The first protrusions 410 (i.e., the inner first protrusions 410a and the outer first protrusions 410b) include an inner second bladder 444a and an outer second bladder 444b. The inner second bladder 444a and the outer second bladder 444b can be formed using the same materials and methods as the fluid-filled chamber 204 described above. Preferably, the thickness T of the inner second bladder 444a is MB The thickness T of the inner first protrusion 410a is SP The thickness T of the outer second bladder 444b is equal to LB and Fig.23 The thickness T of the outer first protrusion 210b shown in SP The inner second bladder 444a and the outer second bladder 444b are schematically shown as being a cube with rounded edges. However, it should be understood that the inner second bladder 444a and the outer second bladder 444b can be shaped similar to Fig.23 4. A medial second bladder 444a and a lateral second bladder 444b may be secured to the second surface 408b of the first substrate 408 at the forefoot region 12, typically at the same locations as the medial first 410a and the lateral first 410b, respectively.

[0151] Reference now Fig. 22C , Fig.23C and Fig.27CIn one configuration of the midsole 402c, the first protrusion 410 and the second protrusion 412 are formed as separate parts from the midsole 402c. The second surface 408b of the first substrate 408 is generally smooth and uninterrupted from the front end 18 to the rear end 20. Similarly, the third surface 454a of the second substrate 454 is generally smooth and uninterrupted from the front end 18 to the rear end 20. The second protrusion 412 is a first bladder 442, and the first protrusion 410 (i.e., the medial first protrusion 410a and the lateral first protrusion 410b) include a medial second bladder 444a and an lateral second bladder 444b. The first bladder 442 is larger than each of the medial second bladder 444a and the lateral second bladder 444b, and can include the same or different pressures. The medial second bladder 344a and the lateral second bladder 344b are shown as being generally the same size and can include the same or different pressures from each other. The first bladder 442, the medial second bladder 444a, and the lateral second bladder 444b are schematically shown as truncated pyramids. The medial second bladder 444a and the lateral second bladder 444b can be fixed to the second surface 408b of the first substrate 408 at the forefoot region 12, generally in contact with the Fig.23 The first bladder 442 may be secured to the third surface 454a of the second substrate 454 at the heel region 16, generally at a position similar to that of the medial first protrusion 410a and the lateral first protrusion 410b. Fig. 22 The same position of the second protrusion 412 is shown in FIG.

[0152] Figures 21 to 30 4 is configured to generate loads on top side 204a and bottom side 204b of fluid-filled chamber 204. At heel region 16, the load is applied to first contact area 236 located on bottom side 204b of fluid-filled chamber 204. At forefoot region 12, the load is applied to first contact area 236 located on top side 204b of fluid-filled chamber 204. First engagement area 432 of first protrusion 410 is disposed above first contact area 236, and second engagement area 434 of second protrusion 412 is disposed below second contact area 238.

[0153] First protrusion 410 extends from first substrate 408 toward outsole 206 and contacts first contact area 236 of fluid-filled chamber 204, and bottom side 204b of fluid-filled chamber 204 is mounted to interior surface 32 of outsole 206. Second surface 408b of first substrate 408 surrounding first protrusion 410 is spaced apart from top side 204a of fluid-filled chamber 204.

[0154] Second protrusion 412 extends from second substrate 454 toward upper 100 and contacts second contact area 238 of fluid-filled chamber 204. Top side 204a of fluid-filled chamber 204 contacts second surface 408b of substrate 408, and third surface 454a of second substrate 454 surrounding second protrusion 412 is spaced apart from bottom side 204b of outsole 206. Void 214 separates first protrusion 410 from second protrusion 412, and outsole 206 extends through void 214 at an angle. Thus, sole structure 400 allows radial displacement of midsole 400 around first protrusion 410 and second protrusion 412. Furthermore, sole structure 400 is relatively free to flex along the portion of midsole 402 above void 214.

[0155] The following clauses provide exemplary configurations for the sole structures and articles of footwear described above.

[0156] Clause 1. A sole structure for an article of footwear includes a heel region, a forefoot region, a fluid-filled chamber, and a midsole. The fluid-filled chamber extends from the heel region to the forefoot region. The midsole includes a first protrusion that contacts the fluid-filled chamber at a first contact area in the forefoot region and a second protrusion that contacts the fluid-filled chamber at a second contact area in the heel region. The first protrusion is spaced apart and separated from the second protrusion.

[0157] Clause 2. The sole structure of clause 1, wherein the first protrusion includes a distal end defining a first engagement zone that contacts the first contact zone, and the second protrusion includes a distal end defining a second engagement zone that contacts the second contact zone, the first engagement zone and the second engagement zone being smaller than a width of the fluid-filled chamber defined between an inner side of the fluid-filled chamber and an outer side of the fluid-filled chamber.

[0158] Clause 3. The sole structure of any of the preceding clauses, wherein a void is defined between the first protrusion and the second protrusion, the void extending from a medial side of the sole structure to a lateral side of the sole structure.

[0159] Clause 4. A sole structure according to any one of the preceding clauses, wherein the midsole comprises a substrate extending from the heel region to the forefoot region and comprising a first surface and a second surface, the second surface being disposed on a side of the substrate opposite to the first surface, the first protrusion and the second protrusion extending from one of the first surface and the second surface.

[0160] Clause 5. The sole structure of Clause 4, further comprising an outsole defining a ground engaging surface, the outsole being attached to the second surface of the substrate.

[0161] Clause 6. The sole structure of Clause 4, further comprising a footbed operable to receive a foot of a wearer, the second surface of the substrate being opposite the footbed.

[0162] Clause 7. The sole structure of any preceding clause, wherein the fluid-filled chamber includes a first end that contacts the midsole at a location proximate a front end of the sole structure.

[0163] Clause 8. The sole structure of any of the preceding clauses, wherein the fluid-filled chamber includes a second end spaced apart from the midsole at a location proximate a rear end of the sole structure.

[0164] Clause 9. The sole structure of any of the preceding clauses, further comprising a void extending from a medial side of the sole structure to a lateral side of the sole structure between the first protrusion and a front end of the sole structure.

[0165] Clause 10. An article of footwear incorporating a sole structure according to any of the preceding clauses.

[0166] Clause 11. A sole structure for an article of footwear includes a heel region, a forefoot region, a fluid-filled chamber, and a midsole. The fluid-filled chamber extends from the heel region to the forefoot region. The midsole includes a first protrusion and a second protrusion, the first protrusion extending from the midsole in a first direction and contacting the fluid-filled chamber at a first contact area in the forefoot region, and the second protrusion extending from the midsole in a second direction opposite the first direction and contacting the fluid-filled chamber at a second contact area in the heel region.

[0167] Clause 12. The sole structure of clause 11, wherein the first protrusion includes a distal end defining a first engagement zone that contacts the first contact zone, and the second protrusion includes a distal end defining a second engagement zone that contacts the second contact zone, the first engagement zone and the second engagement zone being smaller than a width of the fluid-filled chamber defined between an inner side of the fluid-filled chamber and an outer side of the fluid-filled chamber.

[0168] Clause 13. The sole structure of any of the preceding clauses, wherein a void is defined between the first protrusion and the second protrusion, the void extending from a medial side of the sole structure to a lateral side of the sole structure.

[0169] Clause 14. A sole structure according to any of the preceding clauses, wherein the midsole comprises a first substrate and a second substrate, the first substrate extending from the forefoot region to the heel region and comprising a first surface and a second surface, the second surface being disposed on a side of the first substrate opposite to the first surface, the second substrate extending from the heel region to the midfoot region and comprising a third surface and a fourth surface, the fourth surface being disposed on a side of the second substrate opposite to the third surface, the first protrusion extending from the second surface in a direction toward a ground engaging surface of the sole structure, and the second protrusion extending from the third surface in a direction away from the ground engaging surface.

[0170] Clause 15. The sole structure of Clause 14, further comprising an outsole defining the ground engaging surface, the outsole being attached to the fourth surface of the second substrate in the heel region and to the fluid-filled chamber in the forefoot region.

[0171] Clause 16. The sole structure of Clause 14, further comprising a footbed operable to receive a foot of a wearer, the first surface of the first substrate opposing the footbed.

[0172] Clause 17. The sole structure of any preceding clause, wherein the fluid-filled chamber includes a first end that contacts the midsole at a location proximate a front end of the sole structure.

[0173] Clause 18. The sole structure of any of the preceding clauses, wherein the fluid-filled chamber includes a second end spaced apart from the midsole at a location proximate a rear end of the sole structure.

[0174] Clause 19. The sole structure of any of the preceding clauses, further comprising a void extending between the first protrusion and the front end of the sole structure from the medial side of the sole structure to the lateral side of the sole structure.

[0175] Clause 20. An article of footwear incorporating a sole structure according to any one of clauses 11 to 19.

[0176] The foregoing description is provided for the purpose of illustration and description. The foregoing description is not intended to be exhaustive or to limit the present disclosure. Individual elements or features of a particular configuration are generally not limited to that particular configuration, but where applicable, individual elements or features are interchangeable and can be used in a selected configuration, even if not specifically shown or described. Individual elements or features of a particular configuration may also be varied in a variety of ways. Such variations should not be considered as departing from the present disclosure, and all such modifications are intended to be included within the scope of the present disclosure.

Claims

1. A sole structure for a footwear article, the sole structure comprising: Heel area; Forefoot area; a fluid-filled chamber extending from the heel region to the forefoot region; as well as A midsole includes a first protrusion contacting the fluid-filled chamber at a first contact area in the forefoot region and a second protrusion contacting the fluid-filled chamber at a second contact area in the heel region, the first protrusion being spaced apart and separated from the second protrusion.

2. The sole structure of claim 1 , wherein the first protrusion includes a distal end defining a first engagement zone that contacts the first contact zone, and the second protrusion includes a distal end defining a second engagement zone that contacts the second contact zone, the first engagement zone and the second engagement zone being smaller than a width of the fluid-filled chamber defined between an inner side of the fluid-filled chamber and an outer side of the fluid-filled chamber.

3. The sole structure of claim 1, wherein a void is defined between the first protrusion and the second protrusion, the void extending from a medial side of the sole structure to a lateral side of the sole structure.

4. The sole structure according to claim 1, wherein the midsole includes a substrate, the substrate extending from the heel area to the forefoot area and including a first surface and a second surface, the second surface being arranged on a side of the substrate opposite to the first surface, and the first protrusion and the second protrusion extending from one of the first surface and the second surface.

5. The sole structure of claim 4, further comprising an outsole defining a ground engaging surface, the outsole being attached to the second surface of the substrate.

6. The sole structure of claim 4, further comprising a footbed operable to receive a foot of a wearer, the second surface of the substrate opposing the footbed.

7. The sole structure of claim 1, wherein the fluid-filled chamber includes a first end that contacts the midsole at a location proximate a front end of the sole structure.

8. The sole structure of claim 1, wherein the fluid-filled chamber includes a second end spaced apart from the midsole at a location proximate a rear end of the sole structure.

9. The sole structure of claim 1, further comprising a void extending from a medial side of the sole structure to a lateral side of the sole structure between the first protrusion and a front end of the sole structure.

10. An article of footwear incorporating the sole structure of claim 1.

11. A sole structure for a footwear article, the sole structure comprising: Heel area; Forefoot area; a fluid-filled chamber extending from the heel region to the forefoot region; as well as A midsole comprising a first protrusion extending from the midsole in a first direction and contacting the fluid-filled chamber at a first contact area in the forefoot region and a second protrusion extending from the midsole in a second direction opposite to the first direction and contacting the fluid-filled chamber at a second contact area in the heel region.

12. The sole structure of claim 11 , wherein the first protrusion includes a distal end defining a first engagement zone that contacts the first contact zone, and the second protrusion includes a distal end defining a second engagement zone that contacts the second contact zone, the first engagement zone and the second engagement zone being smaller than a width of the fluid-filled chamber defined between an inner side of the fluid-filled chamber and an outer side of the fluid-filled chamber.

13. The sole structure of claim 11, wherein a void is defined between the first protrusion and the second protrusion, the void extending from a medial side of the sole structure to a lateral side of the sole structure.

14. The sole structure according to claim 11, wherein the midsole includes a first substrate and a second substrate, the first substrate extends from the forefoot area to the heel area and includes a first surface and a second surface, the second surface is arranged on a side of the first substrate opposite to the first surface, the second substrate extends from the heel area to the midfoot area and includes a third surface and a fourth surface, the fourth surface is arranged on a side of the second substrate opposite to the third surface, the first protrusion extends from the second surface in a direction toward a ground engaging surface of the sole structure, and the second protrusion extends from the third surface in a direction away from the ground engaging surface.

15. The sole structure of claim 14, further comprising an outsole defining the ground engaging surface, the outsole attached to the fourth surface of the second substrate in the heel region and to the fluid-filled chamber in the forefoot region.

16. The sole structure of claim 14, further comprising a footbed operable to receive a foot of a wearer, the first surface of the first substrate opposing the footbed.

17. The sole structure of claim 11, wherein the fluid-filled chamber includes a first end that contacts the midsole at a location proximate a front end of the sole structure.

18. The sole structure of claim 11, wherein the fluid-filled chamber includes a second end spaced apart from the midsole at a location proximate a rear end of the sole structure.

19. The sole structure of claim 11, further comprising a void extending from a medial side of the sole structure to a lateral side of the sole structure between the first protrusion and a front end of the sole structure.

20. An article of footwear incorporating the sole structure of claim 11.

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