Patent Application
20080313932
This invention relates generally to an article of footwear, and, in particular, to an article of footwear with a laminated sole assembly.
Current shoe designs, and, more specifically, current shoe sole designs, do not work particularly well when used by individuals to walk, run, jump or otherwise move on granular surfaces, e.g., sand and snow. Current shoe designs are limiting in that much of the energy exerted by the wearer is lost, since the wearer's shoe tends to slip when they move. This energy loss is prevalent during propulsion as well as during braking or stopping.
This is especially problematic when the wearer is running, playing volleyball, or engaged in any type of athletic activity in which traction and the ability to stop quickly are paramount. Suitable footwear for such activities requires good traction and is preferably lightweight. The competitive nature of some athletic activities being performed on granular surfaces, e.g., professional beach volleyball, and the increase in the number of such athletic activities in which people are engaged, has brought greater attention to this issue and increased the need for a solution.
It is an object of the present invention to provide a sole for an article of footwear that reduces or overcomes some or all of the difficulties inherent in prior known devices. Particular objects and advantages of the invention will be apparent to those skilled in the art, that is, those who are knowledgeable or experienced in this field of technology, in view of the following disclosure of the invention and detailed description of certain preferred embodiments.
The principles of the invention may be used to advantage to provide an article of footwear with a laminated sole assembly. In accordance with a first aspect, an article of footwear includes an upper and a sole assembly positioned beneath the upper. The sole assembly includes an outer layer having a plurality of recesses formed in an upper surface thereof, with each recess forming a corresponding projection on a lower surface of the outer layer. Each of a plurality of core members is received in one of the recesses. An inner layer is laminated to the outer layer, thereby capturing the core members between the outer and inner layers.
In accordance with another aspect, an article of footwear includes an upper and a sole assembly positioned beneath the upper. The sole assembly includes an outer layer formed of a stretchable material having a plurality of recesses formed in an upper surface thereof, with each recess forming a corresponding projection on a lower surface of the outer layer. Each of a plurality of cleats is received in one of the recesses. An inner layer formed of an elastomeric material is laminated to the outer layer, thereby capturing the cleats between the outer and inner layers.
In accordance with a further aspect, an article of footwear includes an upper and a sole assembly positioned beneath the upper. The sole assembly includes an outer layer formed of a rubber material having a spandex backing, and has a plurality of recesses formed in an upper surface thereof. Each recess forms a corresponding projection on a lower surface of the outer layer. Each of a plurality of cleats is received in one of the recesses. An inner layer formed of neoprene is laminated to the outer layer, thereby capturing the cleats between the outer and inner layers.
Substantial advantage is achieved by providing footwear with a laminated sole assembly. In particular, certain embodiments provide footwear that is lightweight and provides good traction so a user can walk, run, jump or otherwise move on granular surfaces, e.g., sand and snow. Such footwear is particularly advantageous for a user competing athletic activities being performed on granular surfaces, e.g., beach volleyball.
These and additional features and advantages disclosed here will be further understood from the following detailed disclosure of certain embodiments.
The figures referred to above are not drawn necessarily to scale and should be understood to provide a representation of particular embodiments of the invention, and are merely conceptual in nature and illustrative of the principles involved. Some features of the footwear with a laminated sole assembly depicted in the drawings have been enlarged or distorted relative to others to facilitate explanation and understanding. The same reference numbers are used in the drawings for similar or identical components and features shown in various alternative embodiments. Footwear with a laminated sole assembly as disclosed herein would have configurations and components determined, in part, by the intended application and environment in which they are used.
The present invention may be embodied in various forms. A preferred embodiment of an article of footwear 10 is shown in
Forefoot portion 16 generally includes portions of footwear 10 corresponding with the toes and the joints connecting the metatarsals with the phalanges. Midfoot portion 18 generally includes portions of footwear 10 corresponding with the arch area of the foot, and heel portion 20 corresponds with rear portions of the foot, including the calcaneus bone. Medial side 12 and lateral side 20 extend through each of portions 16-20 and correspond with opposite sides of footwear 10. Portions 16-20 and sides 12-14 are not intended to demarcate precise areas of footwear 10. Rather, portions 16-20 and sides 12-14 are intended to represent general areas of footwear 10 to aid in the following discussion. Portions 16-20 and sides 12-14 may also be applied to upper 22 specifically, or any other portion of footwear 10.
In the embodiment illustrated in
Unless otherwise stated, or otherwise clear from the context below, directional terms used herein, such as rearwardly, forwardly, inwardly, downwardly, upwardly, etc., refer to directions relative to footwear 10 itself. Footwear 10 is shown in
Footwear 10 includes an upper 22 and a sole assembly 24 secured at least about its peripheral edge to upper 22. As seen in
Upper 22 may take the form of a bootie, as seen in the embodiment illustrated in
In a preferred embodiment, a coating 27 is applied around an inside upper peripheral edge of collar 25. Coating 27 may be an elastomeric and tacky polymer, such as, but not limited to polyurethane (PU), silicone, nylon, polyester, or an acrylic based polymer. Coating 27 serves to allow the edge of collar 25 to be finished without a binding to reduce fraying, to help collar 25 adhere to the skin of the user in order to minimize the amount of sand entering footwear 10, and to capture any grains of sand that may work their way inside footwear 10. A protective coating may also be applied to seams and/or stitching on other portions of footwear 10 for the purpose of durability and to prevent the textile from fraying. For example, stitching 26 that secures sole assembly 24 to upper 22 may have such a coating. Additionally, coatings may also be applied to the textile upper, either internally or externally, to provide enhanced textile durability in high wear areas such as, but not limited to, the areas above and beneath the toes in forefoot portion 16, and the instep in midfoot portion 18.
A strap 29 extends across an instep of upper 22 from medial side 12 to lateral side 14 of midfoot portion 18. A fastener 31 releasably secures strap 29 to upper 22. In the illustrated embodiment, strap 29 includes a first portion 33 of fastener 31. A second portion 35 of fastener 31 is secured to upper 22. Each of first and second portions 33, 35 may be, as illustrated, one of a hook and loop portion of a hook and loop fastener. Other types of fasteners suitable for securing strap 29 will become readily apparent to those skilled in the art, given the benefit of this disclosure.
Sole assembly 24 is seen in
Outer layer 28 may be formed of a flexible resilient material, such as a blown rubber material with a spandex backing, for example, other rubber materials, or any other suitable flexible resilient material. In certain embodiments, the spandex material backing may be one-way stretchable while in other embodiments it may be two-way stretchable. Other suitable materials for outer layer 28 will become readily apparent to those skilled in the art, given the benefit of this disclosure. Recesses 34 may be formed in outer layer 28 through compression molding, for example. Other methods of forming recesses 34 in outer layer 28 will become readily apparent to those skilled in the art, given the benefit this disclosure.
In certain embodiments, core members 32 take the form of cleats. It is to be appreciated that core members 32 can take many forms. For example, core members 32 could be pods, traction elements having any desired shape, or cushioning elements. Other suitable shapes of core members will be readily apparent to those skilled in the art, given the benefit of this disclosure.
As illustrated here, each core member 32 includes a base portion 38 and a projection 40 extending downwardly from base portion 38. A shoulder 42 is formed about projection 40 proximate base portion 38. Core member 32 includes four sidewalls 44 projecting downwardly and inwardly providing a tapered shape for core member 32. It is to be appreciated that core members 32 can have any desired shape. Thus, for example, core members 32 can be cylindrical, conical, rectangular, or any other desired shape. Another embodiment of core members 32 is seen in
In certain embodiments, core members 32 may be formed of a resilient, polymer foam materials, such as ethylvinylacetate (EVA). In other embodiments, core members 32 may be formed of polyurethane, gel capsules, air bladders, or a rubber material, for example. Other suitable materials for core members 32 will become readily apparent to those skilled in the art, given the benefit of this disclosure.
As best seen in
After core members 32 have been seated in recesses 34, inner layer 30 is laminated to outer layer 28, thereby capturing core members 32 therebetween. Inner layer 30 and outer layer 28 may be laminated together with an adhesive. Once the elements of sole assembly 24 have been laminated together, sole assembly 24 can then be secured to upper 22 as noted above.
Inner layer 30 may be formed of flexible insulating materials such as neoprene foam, closed cell foams, polyether and polyester based PU foams, thermoplastic foams, polymer blends incorporating expanding polymeric or glass microspheres, a mesh or textile material. Other suitable materials for inner layer 30 will become readily apparent to those skilled in the art, given the benefit of this disclosure. In certain embodiments, the inner layer may be formed as part of upper 22 itself, or it may be the portion of footwear 10 that forms a footbed that contacts the user's foot directly.
As noted above, core members 32 may take other shapes other than cleats. For example, as seen in
It is to be appreciated that sole assembly 24 can be positioned in other locations within footwear 10. In certain embodiments, sole assembly 24 need not necessarily be secured to an exterior surface of upper 22. For example, core members 32 could form part of a midsole or insole of footwear 10. Thus, core members 32 need not necessarily form the ground engaging portion of footwear 10. That is, core members 32 could be captured entirely within the midsole of footwear 10 to provide cushioning and support. Core members 32 could form part of a removable midsole, as illustrated in U.S. application Ser. No. 11/682,998, entitled “Footwear with Removable Midsole Having Projections,” filed on Mar. 7, 2007, the entire disclosure of which is incorporated herein by reference in its entirety, in which core members 32 could extend through an upper plate that is in turn secured to an upper.
Thus, while there have been shown, described, and pointed out fundamental novel features of various embodiments, it will be understood that various omissions, substitutions, and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit and scope of the invention. For example, it is expressly intended that all combinations of those elements and/or steps which perform substantially the same function, in substantially the same way, to achieve the same results are within the scope of the invention. Substitutions of elements from one described embodiment to another are also fully intended and contemplated. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.
