The present invention relates to a shoe construction and, more particularly, to a three layered shoe construction with an outsole having a slotted and ribbed non-skid flexible traction exterior face to enhance flexibility and comfort, a dual density midsole having mating projections for registering with the slots of the outsole, and an insole having a raised grid pattern for increased breathability and comfort coupled with a raised arch area for providing additional support to the arch of the foot.
Numerous shoes, covering a broad range of different designs and styles have been manufactured and sold in the marketplace. While shoes are worn to provide protection to one's feet, to reduce the impact felt when walking on hard surfaces, to provide support for the feet, and to prevent pronation, shoe designers must still seek to provide optimum levels of stability and comfort. In order to accomplish all of these objectives, shoe designers have used a wide variety of different tools and methods including heel plugs, shanks, contoured soles, deformable pillars or columns, spring-like structures, different traction designs, cushioning members, different shank designs, different ventilation structures, rocker elements, pads, gels and sole constructions having a plurality of different layers. Although these methods can be effective, the large number of components can result in increased manufacturing costs and complexity. It is therefore desirable to improve cushioning, flexibility, support and stability without increasing the number of components to achieve the same level of comfort for the user.
The present invention is directed to a three layer shoe construction which includes an outsole, midsole, and insole. The three layers have a mating relationship which will be later described in detail. The three components of the present shoe are preferably secured together through conventional means such as through cementing and/or adhesives thereby preventing relative movement between the layers during assembly and use of the present shoe. Each of the three layers of the present shoe are generally in the shape of a human foot and can be divided into different sections according to the three different regions of the human foot—the forefoot, the midfoot, and the hind foot. The forefoot is generally adjacent to and includes the toe area; the hind foot is generally adjacent to and includes the heel area; and the midfoot is located adjacent to both the forefoot and the hind foot. The ball of the foot is generally the area of the foot at the juncture between the metatarsal bones and the phalange bones. The two primary regions of the foot for load bearing when walking or standing normally are the ball area and the heel area, and the major bending of the shoe during normal use is typically in the ball area. The arch or instep is positioned between the heel and ball areas and flexes very little when walking normally.
The present outsole is made out of a super lightweight thermoplastic rubber (TPR) and includes an exterior and interior face. The exterior face of the present outsole engages the ground or other walking surfaces, while the interior face is located opposite the exterior face and has a mating relationship with the midsole as will be hereinafter further described in more detail.
The exterior face of the outsole includes a first section, a second section, and a third section located and positioned at approximately the forefoot, midfoot, and hind foot areas respectively. The first and third sections of the outsole cover substantially the entire forefoot and hind foot area. The second section, on the other hand, does not substantially cover the entire midfoot area but instead connects the first and third sections. The second section is adjacent and attaches to the first section on its medial side, while the second section is also adjacent and attaches to the third section on its lateral side.
All three sections of the exterior face of the outsole have a plurality of oval shaped projections. The first and third sections have two types of oval shaped projections—oval shaped projections with channels and oval shaped projections with a non-skid texture. The oval shaped projections with channels cover the majority of the forefoot and hind foot area, and each have a plurality of generally horizontal channels, or grooves, across its surface. Each channel is defined by a pair of opposing sidewalls and a groove surface in a second plane. The groove surface and pair of opposing sidewalls create fluid flow channels to help guide liquid off the outer surface and to the outer perimeter of the outsole, thereby preventing the outer surface from becoming slippery. Another added benefit of the oval shaped projections with channels is the increased flexibility in the outsole which allows a person to walk with a more natural stride instead of unnaturally constraining the foot.
In addition to the oval shaped projections with channels, the forefoot and hind foot areas of the exterior face of the outsole also include oval shaped projections with a non-skid texture that only covers a portion of the forefoot and hind foot area. More specifically, the oval shaped projections with a non-skid texture cover the entire midfoot area of the exterior face of the outsole, and extend from the midfoot area into a portion of the forefoot and hind foot areas. The oval shaped projections with a non-skid texture provides for better traction and prevents the wearer from slipping when the shoe is worn.
Another feature of the outsole is that its first and third sections have a plurality of slots. The first section includes a plurality of slots wherein the slots extend inwardly from both the medial and lateral side edges of the outsole. The third section also includes a plurality of slots which extend inwardly only from the lateral edge of the outsole. The plurality of slots have a mating relationship with the midsole which will be explained hereafter.
The midsole is made of a dual density blown ethylene-vinyl acetate copolymer (EVA) with an intrinsic molded arch support which supports the arch of the foot. The EVA creates a lightweight and resilient midsole, which helps dissipate shock when walking or running. In addition to the material itself, the dual density of the midsole allows for a greater flexibility and cushioning in the forefoot area due to its lighter density, and provides greater support and stability in the hind foot area due to its heavier density. The sidewall of the midsole extends completely around the perimeter of the midsole and includes a scored pattern around at least a portion of the sidewall, wherein the scored pattern is a series of horizontal lines. The series of horizontal lines help absorb and dissipate shock.
The midsole includes a proximal and distal face. The distal face of the midsole includes a plurality of ribs which correspond to the slots of the outsole. Each rib includes a channel or groove for dissipating water or another liquid and one set of ribs starts at the outer perimeter of the lateral edge of the midsole and extends inwardly towards the medial edge of the midsole in the forefoot and hind foot areas. Another set of ribs starts at the medial edge of the forefoot area and extends inwardly towards the lateral edge of the midsole. In addition to the plurality of ribs, the distal face of the midsole also includes two protrusions at the midfoot area which correspond to the shape of the outsole at its midfoot area. In other words, the first protrusion forms a somewhat triangular shape wherein a first side of the first protrusion is the medial side of the midsole's outer perimeter, a second side starts at the top of the first side closer to the forefoot area, and continues inwardly at an increasing angle before forming a third side by continuing outwards towards the midsole's outer perimeter. Similarly to the first protrusion, the second protrusion is also in the midfoot area and forms a somewhat right triangular shape opposite to the first protrusion adjacent to the lateral edge portion of the midsole. The two protrusions and ribs form a plurality of channels or spaces located at a lower level than the raised ribs which correspond to the slotted forefoot and hind foot areas of the outsole and the midfoot portion of the outsole, thereby allowing the outsole to have a mating relationship with the midsole. The outsole mates with and is received by the plurality of channels formed on the distal face of the midsole.
The proximal face of the midsole includes a lip around the entire circumference of the midsole thereby creating a cavity substantially in the shape of the midsole. The insole mates with and is received by the cavity created by the lip on the proximal face. The three layers are preferably secured together to prevent movement when worn.
The insole is a lightweight, thermal molded EVA with an antimicrobial shield which provides protection against bacteria, fungus, and controls or eliminates odors, stains, and product deterioration. This can be accomplished by adding a powder or other antimicrobial agents during the manufacturing process. The insole has a top face and a bottom face, wherein the top face engages with the foot of a wearer and includes a plurality of diamond shaped apertures that provide both greater flexibility and breathability when the overall shoe is worn. In one embodiment, the diamond shaped apertures are spaced from approximately the terminal end of the toe area and cover the rest of the top face of the insole except for the arch portion. Both the top face of the insole at the toe and arch areas are substantially smooth.
The present three layer shoe construction absorbs shock, enhances comfort, and creates a unique propulsion effect, without requiring a vast number of components.
For a better understanding of the various embodiments of the present invention, reference may be made to the accompanying drawings in which:
While the disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will hereafter be described in detail. It should be understood, however, that the drawings and detailed description presented herein are not intended to limit the disclosure of the present invention to the particular embodiment disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure.
The present invention will now be described with reference to the drawing figures in which like reference numerals refer to like parts throughout the disclosure. For purposes of clarity in illustrating the characteristics of the present invention, proportional relationships of the elements have not necessarily been maintained in the drawing figures.
As illustrated in
Each of the three layers of the present shoe are generally in the shape of a human foot and can be divided into different sections according to three distinct regions of the human foot—the forefoot, midfoot, and hind foot. The forefoot area or region of the foot is approximately adjacent to and includes the toe area A, while the hind foot area or region of the foot is approximately adjacent to and includes the heel area B. The midfoot area or region is approximately adjacent to both the forefoot and hind foot regions as illustrated in
The present outsole 4 is made out of a super lightweight thermoplastic rubber (TPR) and includes an exterior face 6 and an interior face 8 as seen in
In one embodiment, the exterior face 6 of the outsole 4 includes a first section 10, a second section 11, and a third section 12, divided approximately into the forefoot, midfoot, and hind foot areas respectively as best illustrated in
Turning to
In addition to the oval shaped projections with channels 14, the forefoot and hind foot areas also include oval shaped projections with a non-skid texture 16 which only cover a portion of the forefoot and hind foot areas. More specifically, the oval shaped projections with a non-skid texture 16 cover the entire midfoot portion of the outsole 4 and extend from the midfoot portion into a portion of the forefoot and the hind foot areas. The oval shaped projections with a non-skid texture 16 prevent the wearer from slipping when the shoe is worn.
In addition to the oval shaped projections 14 and 16, the first and third sections 10, 12 of the outsole also include a plurality of slots 26. In one embodiment, the first section 10 includes a plurality of slots 26 wherein the plurality of slots 26 extend inwardly from the outer perimeter 24 on both the medial and lateral side edges of the outsole 4 as best shown in
The midsole 27 is made of a dual density blown ethylene-vinyl acetate copolymer (EVA) with an intrinsic molded arch support 28 which supports the arch D of the foot which is best shown in
The sidewall 30 of the midsole 27 extends completely around the perimeter of the midsole 27 and includes a scored pattern 32 around at least a portion of the sidewall 30, wherein the scored pattern 32 includes a series of horizontally spaced projections 33 which are vertically arranged in spaced apart relationship which help absorb and dissipate shock as best illustrated in
The midsole 27 includes both a proximal face 34 and a distal face 36. Turning to
In addition to the plurality of ribs 38, the distal face 36 of the midsole 27 also includes a first protrusion 42 and a second protrusion 44 which correspond to the shape of the outsole 4 at its midfoot area. In other words, the first protrusion 42 forms a somewhat triangular shape wherein a first side 46 of the first protrusion 42 is positioned and located at the medial side of the outer perimeter 24 of the midsole in the midfoot area, a second side 47 starts at the top of first side 46, closer to the forefoot area, and continues inwardly at an increasing angle along second side 47 before forming a third side 48 by continuing outwards to the outer perimeter 24 in the midfoot area of the midsole. Similar to the first protrusion 42, the second protrusion 44 is also in the midfoot area of the midsole 27 and forms a somewhat right triangular shape opposite to the first protrusion 42, adjacent to the lateral edge of the midsole 27. The two protrusions 42, 44 and the plurality of ribs 38 form a plurality of channels or spaces 50 located at a lower level than the raised protrusions 42, 44 which correspond to the slotted outsole 4 thereby allowing the outsole 4 to have a mating relationship with the midsole 27.
The proximal face 34 of the midsole 27 includes a lip 52 around the entire circumference of the midsole 27 thereby creating a cavity 54 substantially in the shape of the insole 56 as best illustrated in
The insole 56 is a lightweight, thermal molded EVA with an antimicrobial shield which provides protection against bacteria, fungus, and controls or eliminates odors, stains, and product deterioration. This can be accomplished by adding a powder or other antimicrobial agents during the manufacturing process. The insole 56 has a top face 58 and a bottom face 60 as best illustrated in
From the foregoing, it will be seen that the various embodiments of the present invention are well adapted to attain all the objectives and advantages hereinabove set forth together with still other advantages which are obvious and which are inherent to the present structures. It will be understood that certain features and sub-combinations of the present embodiments are of utility and may be employed without reference to other features and sub-combinations. Since many possible embodiments of the present invention may be made without departing from the spirit and scope of the present invention, it is also to be understood that all disclosures herein set forth or illustrated in the accompanying drawings are to be interpreted as illustrative only and not limiting. The various constructions described above and illustrated in the drawings are presented by way of example only and are not intended to limit the concepts, principles and scope of the present invention.
Many changes, modifications, variations and other uses and applications of the present invention will, however, become apparent to those skilled in the art after considering the specification and the accompanying drawings. All such changes, modifications, variations and other uses and applications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention which is limited only by the claims which follow.
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Number | Date | Country | |
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20190029363 A1 | Jan 2019 | US |