1. Field of the Invention
This invention relates to footwear, and more particularly to an athletic shoe having an adjustable ride.
2. Background Art
One of the problems associated with footwear, especially athletic shoes, has always been striking a balance between support and cushioning. Throughout the course of an average day, the feet and legs of an individual are subjected to substantial impact forces. Running, jumping, walking, and even standing exert forces upon the feet and legs of an individual which can lead to soreness, fatigue, and injury.
The human foot is a complex and remarkable piece of machinery, capable of withstanding and dissipating many impact forces. The natural padding of fat at the heel and forefoot, as well as the flexibility of the arch, help to cushion the foot.
An athlete's stride is partly the result of energy which is stored in the flexible tissues of the foot. For example, a typical gait cycle for running or walking begins with a “heel strike” and ends with a “toe-off”. During the gait cycle, the main distribution of forces on the foot begins adjacent to the lateral side of the heel (outside of the foot) during the “heel strike” phase of the gait, then moves toward the center axis of the foot in the arch area, and then moves to the medial side of the forefoot area (inside of the foot) during “toe-off”. During a typical walking or running stride, the Achilles tendon and the arch stretch and contract, storing and releasing energy in the tendons and ligaments. When the restrictive pressure on these elements is released, the stored energy is also released, thereby reducing the burden which must be assumed by the muscles.
Although the human foot possesses natural cushioning and rebounding characteristics, the foot alone is incapable of effectively overcoming many of the forces encountered during athletic activity. Unless an individual is wearing shoes which provide proper cushioning and support, the soreness and fatigue associated with athletic activity is more acute, and its onset accelerated. The discomfort for the wearer that results may diminish the incentive for further athletic activity. Equally important, inadequately cushioned footwear can lead to injuries such as blisters; muscle, tendon and ligament damage; and bone stress fractures. Improper footwear can also lead to other ailments, including back pain.
Proper footwear should complement the natural functionality of the foot, in part, by incorporating a sole (typically including an outsole, midsole and insole) which absorbs shocks. However, the sole should also possess enough resiliency to prevent the sole from being “mushy” or “collapsing,” thereby unduly draining the stored energy of the wearer.
In light of the above, numerous attempts have been made to incorporate into a shoe improved cushioning and resiliency. For example, attempts have been made to enhance the natural resiliency and energy return of the foot by providing shoes with soles which store energy during compression and return energy during expansion. These attempts have included the formation of shoe soles that include springs, gels or foams such as ethylene vinyl acetate (EVA) or polyurethane (PU). However, all of these tend to either break down over time or do not provide adequate cushioning characteristics.
Another concept practiced in the footwear industry to improve cushioning and energy return has been the use of fluid-filled systems within shoe soles. These devices attempt to enhance cushioning and energy return by transferring a pressurized fluid between the heel and forefoot areas of a shoe. The basic concept of these devices is to have cushions containing pressurized fluid disposed adjacent the heel and forefoot areas of a shoe.
However, a cushioning device which is pressurized with fluid at the factory is comparatively expensive to manufacture. Further, pressurized fluid tends to escape from such a cushioning device, requiring large molecule fluids such as Freon gas to be used as the inflating fluid. A cushioning device which contains air at ambient pressure provides several benefits over similar devices containing pressurized fluid. For example, generally a cushioning device which contains air at ambient pressure will not leak and lose air, because there is no pressure gradient in the resting state.
Athletes, particularly runners, often have a pair of training shoes and a pair of racing flats. The training shoes are worn for every day training and are selected for their ample cushioning to prevent the injuries and ailments mentioned above. However, on race day, a runner typically wears a pair of racing flats, which have a comparatively thin sole in comparison to the training shoes and less cushioning to make the shoes lighter so that the wearer can run faster. Carrying around two pairs of shoes can be cumbersome and expensive. There is a need in the art to have a single shoe that can serve as both a training shoe and a racing flat.
Disclosed herein is a sole for an article of footwear comprising an upper sole member, a lower sole member, and at least one inflatable bladder disposed between the upper sole member and the lower sole member. The at least one inflatable bladder has an inflated state and a deflated state. A distance between the upper sole member and the lower sole member is greater in the inflated state than the deflated state.
Also disclosed herein is an article of footwear comprising an upper and a sole. The sole comprises an upper sole member, a lower sole member, and at least one inflatable bladder disposed between the upper sole member and the lower sole member. The at least one inflatable bladder has an inflated state and a deflated state. A distance between the upper sole member and the lower sole member is greater in the inflated state than the deflated state.
The present invention is now described with reference to the Figures, in which like reference numerals are used to indicate identical or functionally similar elements. Also in the Figures, the left most digit of each reference numeral corresponds to the Figure in which the reference numeral first appears. While specific configurations and arrangements can be used without departing from the spirit and scope of the invention, it will be apparent to a person skilled in the relevant art that this invention can also be employed in other applications.
A sole of a shoe is shown generally at 100 in
The sole of the present invention has at least one inflatable bladder and can include a plurality of inflatable bladders such as a first inflatable bladder 116 for a heel area 102 and a second inflatable bladder 118 for a forefoot area 104. Alternatively, there may be a single inflatable bladder that spans substantially the entire sole. Other alternative embodiments with varying numbers and placements of inflatable bladders are also envisioned as would be readily apparent to a person of ordinary skill in the relevant art. Inflatable bladders may be fully visible, partially visible or not visible in the assembly in either the inflated state or the deflated state.
One skilled in the relevant art would readily appreciate that the type of inflatable bladder for use in the shoe of the present invention is not limited. One example of an inflatable bladder includes two films of monolayer or multilayer sealable thermoplastic material through which air may not readily pass. Furthermore, the two sealable thermoplastic films may be a multilayer laminate of film and fabric or of film and a non-woven material. The two films utilized to form the inflatable bladder may be the same material or different materials such as a monolayer film and a multilayer laminate. The films of different materials may be cast or coextruded to form the inflatable bladder. An exemplary film includes an outer layer of 12 mil polyester urethane of 50 D Shore hardness, a scrim layer, and an inner layer of 8 mil polyester urethane of 95 A Shore hardness. The scrim layer is present to increase puncture resistance and to increase the tensile strength and its material may include, but is not limited to, 210 denier nylon of high tenacity or polyester. The outer layer material should be of suitable thickness and hardness to increase puncture resistance of the bladder. The inner layers face each other in an assembled inflatable bladder.
The films are sealed around a periphery to form the inflatable bladder. In a preferred embodiment the majority of the peripheral seal is on an inside of the inflatable bladder. Such an inflatable bladder can be made wherein the two films are positioned on top of each other and welded or otherwise sealed along a plurality of the peripheral edges leaving at least one peripheral edge unsealed. The two films are then turned inside out such that the seal is in the interior of the inflatable bladder. Then the remaining peripheral edge(s) is welded or otherwise sealed together to form the inflatable bladder.
Alternatively, the peripheral seal is on an outside of the inflatable bladder wherein the two films are positioned on top of each other and welded or otherwise sealed along the peripheral edges. The welding or sealing may include, but is not limited to, RF welding or heat sealing. Inflatable bladders can be shaped to have a plurality of interconnected inflatable chambers 120 as shown in
Upper sole member 108 and lower sole member 110 may be made from conventional materials as would be apparent to a person of ordinary skill in the relevant art, including, but not limited to, foam. Upper sole member 108 and lower sole member 110 may be formed using conventional means as would be apparent to a person of ordinary skill in the relevant art including, but not limited to, injection molding or compression molding. Upper sole member 108 and lower sole member 110 may each include one or more pieces.
A lower surface of upper sole member 108 and an upper surface of lower sole member 110 may have recesses corresponding to a shape of a portion of the inflatable bladder located between the upper sole member 108 and lower sole member 110. The recesses aid in minimizing the thickness of sole 100 in the deflated state and locating inflatable bladder 112 between upper sole member 108 and lower sole member 110.
In one embodiment, at least one portion of the inflatable bladder folds over a side of the lower sole member and the at least one portion attaches to a lower surface of the lower sole member to provide stacked inflatable cushioning elements.
Inflatable bladder 400 has a main portion 402 and peripheral portions 404. Main portion 402 has at least one inflatable chamber 416 and is fluidly connected to at least one peripheral portion 404 through extensions 406. Inflatable bladder 400 has a welding flange 412 with an inside edge 414 defining a boundary of inflatable chamber 416. Air may enter inflatable bladder 400 through a barb connector attached at a location 418. Main portion 402 is located between a lower surface 516 of an upper sole member 508 and upper surface 302 of lower sole member 300. Peripheral portions 404 fold over lower sole member 300 such that extensions 406 bend around grooves 306. Peripheral portions 404 are attached to lower surface 304 of lower sole member 300.
An outsole 510 may be placed over peripheral portions 404 of inflatable bladder 400 such that peripheral portions 404 are located between lower surface 304 of lower sole member 300 and outsole 510. The outsole material may be a lightweight, flexible, expandable material including, but not limited to, rubber or cast polyurethane, or a textile or suitable flexible substrate, that will expand to a profile of peripheral portions 404 when they are in an inflated state. The outsole material may also have treads or lugs formed thereon through direct injection, casting, cementing, or other known methods. Treads or lugs may also be directly attached to an inflatable bladder. Outsole 510 may also wrap up to side surface 512 of lower sole member 300 or extend beyond a gap between lower sole member 300 or upper sole member 508 and bond directly to upper sole member 508. Outsole 510 may also extend toward the leading edge or front edge of lower sole member 500 and connect to the shank 514.
Main portion 402 of inflatable bladder 400 has a first surface 408 that faces upper sole member 508 and a second surface 512 that faces lower sole member 300. First and second surfaces 408, 514 of main portion 402 of inflatable bladder 400 may be directly attached to lower surface 516 of upper sole member 508 or upper surface 302 of lower sole member 300, respectively. Alternatively, either first or second surface 408, 514 of main portion 402 may have one or more plates 410 attached thereto that are then attached to lower surface 516 of upper sole member 508 or upper surface 302 of lower sole member 300, respectively. Plates 410 may be a polymeric material, such as thermoplastic polyurethane. Plates 410 provide a mounting surface between inflatable bladder 400 and lower surface 516 of upper sole member 508 or upper surface 302 of lower sole member 300. Plates may also be located on first and second surfaces 408, 514 of peripheral portions 404 and bonded to lower surface 514 of lower sole member 300 and/or an inside surface of outsole material 510. It is noted that plates may also be located on first and second surfaces of the inflatable bladders depicted in
Plates 410 are strategically shaped, positioned, and made of suitable materials to control the profile of inflatable bladder 400 in its inflated state, to control the height of inflation, and locate inflatable bladder 400 between upper and lower sole members 508, 300. The greater the offset between an edge of plate 410 and an edge of inflatable bladder 400, the greater the thickness of inflation. The offset can also be varied to result in a tapered thickness or offset of inflation, either an increase in thickness or offset along a length of an inflatable bladder or a decrease in thickness along a length of an inflatable bladder. For example, the offset can be varied to result in less inflated thickness at a toe of a shoe and more inflated thickness as the forefoot region curves away from the toe.
When plates 410 are present on a surface of inflatable bladder 400, portions of the surface of inflatable bladder 400 not covered by plates 410 are preferably not attached to the upper sole member, the lower sole member, or anything else. This allows the unattached portions of the inflatable bladder to move away from the upper and lower sole members. However, there may be cases where it is preferred that an inflatable bladder be bonded to upper sole member 508, for example in the toe area or to an air transfer manifold 626.
Plates 410 are made from a polymeric material including, but not limited to, thermoplastic polyurethane. Plates 410 may be applied to inflatable bladder 400 through a variety of methods including, but not limited to, casting, silkscreen printing, or laminating through RF welding, direct injection or cold cementing. Another exemplary method for attaching plates 410 to inflatable bladder 400 includes applying a 3 mil film of low melting temperature adhesive film to a substrate of plate material, cutting out the formed assembly to a desired shape, and then affixing the adhesive side to the inflatable bladder through conventional methods including, without limitation, RF welding or heat pressing. Subsequently plates 410 may be cold cemented or otherwise attached to the upper sole member, lower sole member, or other surface.
In an alternative embodiment, as best seen in
Inflatable bladder 1400 is inserted between an upper member 1502 and a lower member 1504 of sole 1500 such that formed substrate 1300 sits in a cavity formed in upper surface 1608 of lower sole member 1504. Formed substrate 1300 may be cemented or otherwise attached to the cavity in upper surface 1608 of lower sole member 1504. Alternatively, formed substrate 1300 may sit in a cavity formed in lower surface 1610 of upper sole member 1502. Film 1200 has an upper surface 1206 that faces a lower surface 1610 of upper sole member 1502. Upper surface 1206 of film 1200 may have a plurality of plates 1202 thereon for attaching film 1200 to lower surface 1610 of upper sole member 1502. Plates 1202 are similar to and serve the same function as plates 410 discussed above.
The shoes and soles disclosed herein may have a shear controlling member that controls shear stress between an upper sole member and a lower sole member. Such a shear controlling member is shown in
In order for a wearer to customize the amount of air in a bladder, the bladder is placed in fluid communication with an inflation mechanism and an air pressure regulator.
As shown in
Air enters inflation mechanism 622 through an air intake hole (not shown) in underfoot pump 624 and passes through a one-way valve (not shown) into manifold 626 when underfoot pump 624 is compressed. The one-way valve prevents air from flowing back into underfoot pump 624. Manifold 626 has one or more pathways that direct the air into bladders 716, 718, thereby inflating them. The pathways may include flow restrictors locate therein or adjacent entrances to the pathways that limit the airflow to prevent an inflatable heel bladder from being inflated too quickly, thereby eliminating tears in the bladder, and reducing backflow pressures.
An exemplary one-way valve is shown generally at 942 in
When underfoot pump 624 is compressed, air flows into an opening 962 in first end 944 of one-way valve 942 and through the valve body to the outlet opening (not shown). The force of the air pushes against elastomeric sleeve 961 covering the outlet opening causing it to expand allowing air to escape out the outlet opening past elastomeric sleeve 961 and into manifold 626. When the pressure is released from underfoot pump 624, elastomeric sleeve 961 returns to its original, unexpanded state such that air cannot flow back into valve 942 or into underfoot pump 624.
Inflation mechanism 622 described above, is merely exemplary and a variety of other inflation mechanisms may be utilized in the present invention. The inflation mechanism may be an on-board inflation mechanism, for example, a latex bulb which is physically attached to a part of the sole/shoe. Alternatively, the inflation mechanism may be a molded plastic chamber or may be a hand held pump such as one which utilizes CO2 gas to inflate a bladder. Alternatively, the inflation mechanism may be a portion of a monolithic bladder that is separated from the remainder of the bladder. The isolated portion fluidly communicates with the remainder of the bladder via a one-way valve. The one-way valve allows the isolated portion to act as an inflation mechanism. These alternative inflation mechanisms are described more fully, for example, in U.S. Pub. No. 2006/0162186, which is incorporated herein by reference.
Each inflation mechanism requires a one-way valve to be present between the inflation mechanism and the inflatable bladder so that once air enters the inflatable bladder it may not travel backwards into the inflation mechanism. Various types of one-way valves are suitable for use in conjunction with the various alternative inflation mechanisms such as that described in U.S. Pub. No. 2006/0162186, which is incorporated herein by reference.
The inflatable bladder inflated by the inflation mechanism may be fluidly connected to other inflatable bladders located throughout the shoe such that the inflation of one inflatable bladder may in turn inflate other inflatable bladders. Each inflatable bladder may have its own check valve and/or air pressure regulator.
In a preferred embodiment, the sole may have a stiffening member for medial posting attached to the medial side of the sole in a heel area as shown in
A sole or a shoe incorporated with a sole disclosed herein allows the user to adjust the “ride” (cushioning sensation) of the sole/shoe from a state where the inflatable bladder(s) is deflated in a racing flat form to a state where the inflatable bladder(s) is fully inflated to provide maximum cushioning and any partially inflated state inbetween. Inflating the inflatable bladder increases the distance between the upper sole member and the lower sole member, thereby increasing the thickness of the sole and shoe. Conversely, deflating the inflatable bladder decreases the distance between the upper sole member and the lower sole member, thereby decreasing the thickness of the sole. The present invention can be carried out on the entire sole, or any portion or combination of portions thereof, such as a forefoot area or a heel area.
As noted elsewhere, these example embodiments have been described for illustrative purposes only, and are not limiting. Other embodiments are possible and are covered by the methods and systems described herein. Such embodiments will be apparent to persons skilled in the relevant art(s) based on the teachings contained herein. Thus, the breadth and scope of the methods and systems described herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
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