FOOTWEAR SEAM CONSTRUCTION AND METHOD OF MANUFACTURING SAME

Abstract

A footwear member is configured with an outer sole and an upper coupled together so as to define a forefoot area of and a rearfoot area of the footwear. An extending lip member couples the outer sole and the upper member and may extend from either one forming a non-visable or blind seam construction that may be further manipulated in multiple ways. The extending lip member or connection member are stitched together along a forefoot area of the assembled footwear and may optionally allow a portion of a tread member to be glued along a rearfoot area of the assembled footwear. The assembly presented enables optional construction techniques adaptable to a variety of fashion construction options.

Description

FIGURE SELECTED FOR PUBLICATION

FIG. 17

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to footwear and a method of manufacturing same. In particular, the invention relates to a shoe construction having an outsole and upper of footwear stitched together along the forefoot area and glued together along the middle area of the footwear.

2. Discussion of the prior art

The human foot is a combined structure of base and lever, supporting and balancing the body's weight while standing, as well as raising and moving the body. The anatomy of the foot is very complex, but well studied and well know to the shoe industry. Generally, footwear designers tend to construct shoe models that are both comfortable and durable. In addition, of course, the shoes have to be aesthetically appealing and follow the fashion trends.

When even one part of the foot becomes damaged, it can affect every other part of the foot and lead to problems. In very general terms, normal or neutral feet tend to roll off the center of the forefoot (front part of the foot). This motion is associated with substantial stresses upon the forefoot that gradually decrease as the foot rolls towards the heel. Accordingly, in use, if the shoe design ignores both the anatomical and mechanical particularities of the foot, the front of the shoe, if it is not sufficiently reinforced, may wear out rather soon and if not also well designed will appear unattractive. On the other hand, if the shoe has an overly rigid construction, it creates an uncomfortable environment for the foot.

One effort to streamline both the construction of the shoe design and secure the mechanical requirements of the shoe can be found in U.S. Pat. No. 5,203,792 to Kaiser, the entire contents of which are herein fully incorporated by reference. In Kaiser, there is provided a flexible shoe sole member having a lip member extending fully about the top surface. An upper member is then fit, right side in, about the sole such that the upper circumscribes the lip of the sole. Then the upper is secured to the outer wall of the lip and the inner wall of the lip is folded inward and the entire sole flipped right-side-out so as to present a desirable seam surface and a smooth juncture between sole and upper member. Unfortunately, this reference fails to recognize the variants and requirements within the design and construction fields as will be appreciated by one of skill in the art having considered the present disclosure in detail.

In summary, the problems of commercially available manufacturing methods for shoe gluing include at least the following:

Poorly constructed glue joints that easily separate.

Difficult to functionally adhere toe box constructions.

Delicate designs more suitably adapted to hand stitching construction techniques are costly and time consuming.

Non-adaptability of the present glue-joint and stitching construction techniques.

The design aspect is particularly important to consider for fashion conscious woman. Typically, the outsole of the shoe is stitched to the rest of the shoe parts so as to provide a reliable structure capable of withstanding high stresses during use. However, stitching may add to the overall unappealing and bulky look of the shoe and may well create discomfort in use, when stitching is rubbing on a foot portion. Furthermore, as a technological operation, the stitching may be time- and labor-ineffective.

A need therefore exists for footwear that has a reinforced front portion capable of withstanding high stresses while providing the footwear with elegance.

Another need exists for a shoemaking process that is time- and labor-effective.

SUMMARY OF THE INVENTION

The inventive footwear seam construction and method for manufacturing same meets these proposed needs and multiple variants are provided. In non-technical parlance the phase blind-seam may be employed or stitch and turn depending upon the feature of construction being discussed. In accordance with one aspect of the invention, the inventive method includes juxtaposing an upper with an outer surface of an outsole or with the outer surface of a member extending from tan outsole (attached by stitching, gluing, or other construction). The outsole may be made by a variety of molding methods and has an outer surface and an inner surface and may be generally planer in alternative aspects (as will be discussed). The outer surface is provided with a peripheral edge provided by extending the outer surface or by attaching a secondary outsole member or alternatively called a secondary upper portion. In the juxtaposed position also considered an inside-out position, the inner face of the peripheral edge and the forefront bottom portion of the upper overlap one another. Once the overlapping position is established, the upper is turned upside down over the periphery of the outsole and ends up facing the inner surface of the outsole.

In brief summary, a footwear member is optionally configured with an outer sole and an upper coupled together so as to define a forefoot area of and a rearfoot area of the footwear member. An extending lip member couples the outer sole and the upper member and may extend from either one forming a non-visible or blind seam construction that may be further manipulated in multiple ways. The extending lip member or connection member are stitched together along a forefoot area of the assembled footwear and may optionally allow a portion of a tread member to be glued along a rearfoot area of the assembled footwear. The assembly presented enables optional construction techniques adaptable to a variety of fashion construction options.

In accordance with one aspect of the invention, the forefront bottom region of the upper and the peripheral edge of the outsole are then stitched together but may be adhered in other manners without departing from the scope and spirit of the present invention. As mentioned above, the forefront portion of footwear is always under substantial flexing forces generated by the foot motion of the footwear owner as he or she walks forward. Accordingly, the forefront area of the footwear, which is generally defined by the stitched forefront bottom portion and peripheral edge, provides a reliable structure capable of withstanding the flexing forces as constructed according to the alternative details noted below.

During the stitching step, the peripheral edge and forefront bottom portion of the upper are bent inwards to extend substantially parallel to the inner surface. The stitches may penetrate through to the outer surface of the outsole or the extending flange of the secondary upper where thin-layer constitution requires through stitching, however, where permissible by the layer-thicknesses involved the stitching do not penetrate through the outer surface of the outsole preserving, thus, waterproof characteristics of the flexible polymeric material. Alternatively, the stitching may be replaced by thermal bonding, adhesive-bonding, or other known systems to provide a waterproof seam.

In accordance with another aspect of the invention, the stitching may penetrate a portion of the outsole. In still a further aspect of the invention, the stitched parts of the footwear may be bonded with the inner surface of the outsole. Importantly, regardless of the type of the coupling, the exterior of the forefront area, which is located immediately next to the outsole, does not protrude laterally beyond the periphery of the outsole thereby rendering the forefront area of the footwear elegant and appealing to the eye.

The method continues with tucking the rearfoot bottom portion of the upper so that it lies atop the inner surface of the outsole. In accordance with a further aspect of the invention the bent portion is then glued to the outsole's inner surface. Since the rearfoot area of the footwear is exposed to insignificant bending or flexing forces, gluing the outsole to the upper establishes a reliable stress-resistant structure. To meet aesthetic requirements, the surface of the upper, which is immediately adjacent to the bent rearfoot bottom portion, like the forefront bottom portion, does not protrude laterally beyond the periphery of the outsole the inner to the bet portion. Accordingly, both the forefoot and rearfoot bottom portions of the upper substantially conform to the outer contour of the outsole. The footwear manufactured in accordance with the invention is aesthetically appealing, has a reliable structure that takes into consideration the anatomical particularities of the human foot and cost-effective.

These and other features and aspects of the present invention will be better understood with reference to the following description, figures, and appended claims.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 illustrates an exploded view of an alternative aspect of the inventive footwear.

FIG. 2 illustrates a top view of an outsole and upper in a disassembled state of the inventive footwear.

FIG. 3 illustrates an initial position of the upper and outsole of the inventive footwear in accordance with the alternative initial step of one aspect of the inventive method, in which the upper is juxtaposed with the outer surface of the outsole or an extended portion affixed to and extending from the outsole.

FIG. 4 illustrates a subsequent step of the inventive method in which the forefront bottom portion of the upper is stitched the outsole and inverted or turned inside-out so that the upper faces the inner surface of the outsole.

FIG. 5 illustrates a following step of the inventive method in which the rearfoot bottom portion of the upper is inverted to the right-side-out configuration so as to face the inner surface of the outsole.

FIG. 6 illustrates a following step of the inventive method in which the rearfoot bottom portion of the upper is glued to the outsole.

FIG. 7 illustrates the inventive footwear in the assembled state thereof.

FIG. 8 is a side view of a shoe constructed according to an alternative aspect of the present invention.

FIG. 8(A) is a sectional view through line I-I in FIG. 8.

FIG. 8(B) is an enlarged view of Area A in FIG. 8(A).

FIG. 8(C) is a partial view of a base member and an upper portion in a blind-seam connection position prior to turning and later constriction.

FIG. 9 is a sectional view through line II-II in FIG. 8.

FIG. 10 is a plan view of a flexible tread or sole member optionally containing a tread pattern (not shown).

FIG. 11 is a plan view of a separate flexible tread lip or upper lip member that is later connected between the flexible tread or sole members and an upper member.

FIG. 11(A) is a plan view of a stitched together or connected assembly between the flexible tread or sole member in FIG. 10 and the separate flexible tread lip or upper lip member in FIG. 11.

FIG. 12(A) is a plan view of a stitched together upper member containing a tongue portion.

FIG. 12(B) is a partially folded-over or juxtaposed plan view of the stitched together upper member of FIG. 12(A).

FIG. 13 is a side elevational view of the pre-assembly of FIG. 11 and FIG. 12(A) prior to juxtaposition, flipping, or inversion by both members to form FIG. 14.

FIG. 14 is a side elevational assembly view of the juxtaposed, flipped, or inverted assembly of the separate flexible lip member and tread/sole in FIG. 11 with the inverted upper assembly in FIGS. 12(A) and 12(B).

FIG. 15 is a side elevational view of the assembly in FIG. 14, rejuxtaposed or flipped right-side-out exposing the tread member with the insertion of an insole portion.

FIG. 16 is a side elevational view of the assembly of FIG. 15 in combination with an external foot-shaped last member to provide a rigid support for later assembly steps.

FIG. 17 is a side elevational view of a complete assembly combining the assembly of FIGS. 15 and 16, with a heal body.

DETAILED DESCRIPTION

Reference will now be made in detail to a sequence of inventive steps illustrating manufacturing of the inventive footwear in accordance with the inventive method. The drawings are in simplified form and are not to precise scale. For purposes of convenience and clarity only, directional terms, such as top, bottom, left, right, up, down, over, above, below, beneath, rear, front and beyond may be used with respect to the drawings. These and similar directional terms should not be construed to limit the scope of the invention in any manner. The words “connect,” “couple,” and similar terms with their inflectional morphemes do not necessarily denote direct and immediate connections or particular methods of connecting, unless specifically identified, but also include connections through mediate elements or devices.

In coping with the problems noted above, the present invention provides a system for manufacturing footwear, particularly ladies shoes that combines a stitch and turn method utilized by this invention and a conventional glue construction.

Referring to FIGS. 1-6, and in particular to FIG. 1, an inventive footwear 10 is configured with a outsole 12, upper 14, midsole 16, insole 18 and heel 42. Each of the above-identified parts has a forefront portion extending from the front end of the footwear and terminating substantially midway between the front and rear ends of the footwear. Portions of footwear components extending from the midsection to the rear end of the footwear are generally denoted as rearfoot portions. Coupled together, the forefront portions and rearfoot portions of the footwear components define a forefront area 20 and rearfoot area 22, respectively, of footwear 10 (FIG. 7).

During construction, upper 14 is initially juxtaposed with an outer surface 24 of outsole 12 (FIGS. 3 and 4) and subsequently stitched thereto (FIGS. 3 and 4). The stitching step is accomplished by juxtaposing, turning, flipping the upper with the outsole so that a bottom edge 32 of a forefoot bottom portion 44 (FIGS. 1, 3 and 4) overlaps an outer face 48 (FIG. 3) of a peripheral flange 28 of outsole 12. The flange 28 is formed on inner surface 26 of outsole 12 and defines its outer extremity while extending along the forefront portion of the outsole or optionally a greater or lesser portion of the outsole (or as will be discussed an alternative portion of the upper that is affixed separately, as will be discussed). As a result of molding, peripheral flange 28 extends transversely to inner surface 26 rendering positioning of upper 14 labor- and time-effective.

Having juxtaposed upper 14 and outer surface 24 of outsole 12 in the desire position, the overlapped segments of flange 28 and forefront peripheral edge 32 are stitched together, as better illustrated in FIG. 4. Then, upper 14 is inverted so as to face inner surface 26 of outsole 12, as shown in FIG. 4.

Thereafter, a rearfoot peripheral portion 46 is bent inwards so that its edge 34 (FIG. 3) lies atop inner surface 26 of outsole 12. To completely couple the outsole and upper, a layer of glues is inserted between the opposing surfaces of the upper and outsole. Inserting a weight 40 or foot-last (a rigid foot-shaped body) (FIG. 6) and pressing there against so that it, in turn, brings the opposing surfaces to be glued in close contact with one anther complete the coupling step. Accordingly, the outsole/upper combination is characterized by the stitched forefoot area 20 of footwear 10 and its glued rearfoot area 22. The variously coupled forefoot and rearfoot areas of the footwear allow it to withstand greater stresses usually imposed on the forefront area, while leaving the rearfoot area sufficiently reinforced to withstand relatively insignificant stresses during the use of the footwear. On the other hand, the gluing operation, as compared to the stitching operation, is time-effective which renders the entire coupling step of the inventive method to be time-effective as well.

Completion of the method entails providing a compartment, which is formed as a result of coupling between the upper and outsole, with midsole 18 that is, typically, made from rigid material such as wood, cork, plastic or even metal. The midsole spans the width of the outsole and, thus, is configured as a stiffening member preventing unintended distortion of the forefront area of footwear 10 during shipping and use.

After the midsole is placed atop the inner surface of outsole 12 and attached parts of upper 14, it is fixedly attached thereto so as to prevent relative displacement between the midsole and the rest of coupled components. To soften the supporting structure of the footwear, a cushioned insole 16 is removably inserted into the compartment atop midsole 18. Finally, a heel 42 is attached to the rearfoot portion of the outer surface of outsole 14.

The final product is thus is manufactured by a simple, time- and cost-effective blind seamed process involving in part a turning process benefited by a highly flexible outsole and upper portions. In addition, footwear 10 is elegant because not a single area of the upper protrudes beyond the periphery of the outsole, as will be evidenced during the rest of the disclosure.

As mentioned above, the molded outsole is made with flange 28 extending inwardly from and transversely to inner surface 26 of outsole 12. The forefront bottom portion 44 of upper 14 is juxtaposed with outer face 48 of flange 28 and stitched to this flange. When these parts are subsequently flexed toward the inner surface of outsole 12, the bottom region of upper 14 adjacent to its edge 32 of forefront area 20 does not extend laterally beyond the periphery of outsole 12, thereby providing the forefront area of the footwear with an elegant look.

The rearfoot portion 46 of upper 12 extending along the midsection of the footwear is wider than its forefoot portion 44 and has respective portions of its bottom edge 34 tucked inside so that the rearfoot portion of the upper also does not extend laterally beyond the periphery of outsole 12. Like the forefoot area, the rearfoot area is, thus, elegant, but both the forefoot and rearfoot areas are still sufficiently reinforce to withstand respective stresses upon the footwear.

The inner surface 26 of outsole 12 has an elevated region 36 (FIG. 2) having its periphery spaced from an inner face 50 of flange 28. Thus, opposing sides of the elevated region and flange delimit a trough 38 coextending with flange 28. The trough 28 is dimensioned to receive the full width of flange 28 and, of course, edge 32 of upper 14, when these parts get stitched. Preferably the depth of the trough is sufficient to receive the stitched parts so as to have edge 32 of upper 14, which upon bending forms an outer layer of the stitched parts, flush with the top surface of the elevated region. Thus, the inner surface of footwear 10 supporting the midsole and insole 18 and 16 (FIG. 1), respectively, is substantially flat and provides the owner of the footwear with a comfort. The stitched parts may be glued to the trough during gluing of the rearfoot portions of the upper and outsole. Alternatively, the stitching may be extended into the outsole without, however penetrating the full width thereof.

The footwear 10, as illustrated in FIGS. 1-7 is shown to be designed for women, and, thus, the elegance of the footwear is particularly important. However, the same method and structure may be implemented for manufacturing footwear for men and children. The insole 16, often constructed of natural or synthetic leather is positioned on foam cushion. Commonly an adhesive glue, often a clue compatible with a PVC based outsole 12, is used between the outer and midsole 12, 18, respectively.

Materials used for manufacturing upper 14 can vary in accordance with any given design, but, preferably, the upper is made from leather.

Referring now to FIGS. 8 through 9 an alternative construction discussion is present according to another aspect of the present invention.

A shoe 100 includes a toe portion 200 and a heal portion 300 joined by a continuous sole portion 500 as shown and supported by a heal member 400. A series of decorative cutouts 60, 60 enhance the visual appearance of shoe 100. Sole member 500 is constructed of PVC (polyvinyl chloride), but may be constructed from any suitable material both organic (leather/rubber) and in-organic/man-made (PVC and related elastomeric materials).

Referring now more directly to FIG. 8A-9, toe portion 200 includes a of sole member 500 stitched at extending lip members 140 to upper member portion 90 in a type of blind-seam, as will be discussed. In this embodiment, uppers 90 are joined by upper members 110, 110 at decorative stitchings 111, 111, as shown to enhance an overall attractive appearance. In alternative embodiments, upper 90 in upper member 200 may be continuous from side to side or otherwise alternatively constructed according to the related arts. A pair of opposed stitches 116, 116 on each extending lip member 140 securely join bottom portions of uppers 90 as shown. Sole member 500 additionally includes tread portions 70 for gripping during walking and for enhancing flexibility as desired.

A stiffening member or insole support board member 80 is generally provided for additional support and spans generally the width of sole member 500 to provide stiffening support and prevent unintentional distortion of toe portion 200 during shipping and later use. Stiffening member 80 is inserted after the blind-seam stitching process as the flexibility required to achieve the same prevents prior insertion of stiffening member 80.

A foam cushion member 112 is positioned on insole support board member 80, as shown and increases user comfort. An insole member 113, often constructed of natural or synthetic leather is positioned on cushion member 112 and provides a pleasing visual appearance. Commonly, an adhesive glue 115, often a glue compatible with a PVC based sole member 500, is used between the layers to secure each respective layer to sole member 500 and insole support board 80, and is used as would be otherwise expected by one of skill in the art having read and considered the entire disclosure. In this way, the respective members are secured and shoe 100 is provided in a suitable form for secure consumer use. This construction also is adapted to bind extending lip 140 to respective locations on sole 500 securely locking stitchings 116 in place while providing a pleasing blind-seam outward appearance.

While not mandated by the present construction, alternative variants are envisioned by the present disclosure as noted in expanded view A in FIG. 8(A), an additional adhesive layer 115′ is positioned between stitched or bonded portions of upper member 90 and extending lip members 140 to improve security.

Referring additionally now to FIG. 8(C) a portion of sole member 500 is shown with an extending lip member 140 stitched to upper 90 in a blind seam manner prior to a turning and optional gluing. It will be understood by those of skill in the art that variants of the present invention are within the bounds of the present disclosure, including those variants wherein lip members 140 are provided as separate members, or the stitched portion of upper 90 is provided in a separate upper or separate lip member body, as will be discussed without departing from the scope and spirit of the present invention.

Referring now directly to FIG. 9, heal portion 300 of shoe member 100 is more fully discussed. As shown, sole member 500 is joined to upper 90 employing adhesive 115. Thereafter, insole support board member 80′ (which may be an extension of support board member 80) is positioned and secured allowing later insertion of a reinforcing metal shank member 117 bounded by support board members 118, 118 on either side. Thereafter, foam member 112 (likely a closed cell based foam) is layered with insole member layer 113 and adhered in place using adhesive 115 (not shown). Finally, heal member 400 is secured to the bottom portion of sole 500 to complete construction.

In another manufacturing method discussed, after toe portion 200 is constructed and flipped/inverted (creating a joining or stitching method creating a blind seam), heal portion 300 of shoe 100 is constructed by inserting an external last (shown later) to form a foot-shape and gluing the insole board in place and thereafter finishing and polishing the shoe in a conventional manner. In this way, an alternative embodiment of the present invention provides both a blind-seam construction method for a portion of a shoe construction and a partial stitch-and-turn construction method for a second portion of a shoe construction without departing from the scope and spirit of the present invention.

Referring collectively now to FIGS. 10 through 17 an additional alternative seam construction method employs a lip extending member is provided in assembly 600. Shoe assembly 600 includes a flexible tread member or sole member 601 that may be optionally formed with treads or friction enhancing protuberances or flexibility enhancing undulations (both not shown) so as to enable use as a shoe tread or sole member while being sufficiently flexible to enable the proposed method of assembly as outlined the proposed invention.

A separate flexible tread lip or upper lip member 602 is provide in a shape partially extending about a corresponding portion of tread member or sole member 601, and is shown in a generally “U” or “N” configuration (FIG. 11). It is noted, that the proposed alternative flexible tread lip or upper lip member is functional to flexibly join portions of the flexible tread or sole members 601 and an upper member assembly 603 (as will be discussed), and may be a wholly separate member prior to assembly, may alternatively extend from an upper member assembly 603 or may alternatively extend from flexible tread or sole member 601 according to aspects of the present invention without departing therefrom as will be recognized by those of skill in the art having considered the entire disclosure herein.

As will be noted in FIG. 11A, flexible lip member 602 is connected with flexible tread member 601 with partial perimeter or edge stitching 800 (as shown) but may be connected in any other known bonding, adhering, or affixing method known to those in the shoe construction arts without departing form the scope of the present invention. A toe region 602A of the lip-tread assembly 602B is opposite a lose heal region 602C of tread or sole member 601 that is not connected to tread or sole member 601, as shown. A loose portion 609 opposite toe region 602A is provided where connection 800 ends for the remaining portion of flexible lip member 602.

Referring directly to FIGS. 12(A) and 12(B) an upper assembly 603 contains a continuous upper loop 604 joined along seam 605. Continuous upper loop 604 contains a toe portion 604A and a heal portion 604B including seam 605. An upper tongue portion 605A is joined or connected to continuous upper loop 604 in toe portion 604A in a stitching region 606 or by other connection methods known to those of skill in the art. To invert or juxtapose upper assembly 603 an operator grasps continuous upper loop 604 proximate rear seam 605 and twists along direction arrows 607 and 607A in FIGS. 12A and 12B until ultimately upper assembly 603 is juxtaposed or inverted as will be understood by those of skill in the art.

It will be noted that the top plan view in FIG. 12A is represented in the top part of the view in FIG. 13 prior to the juxtaposition or inside-out switch for assembly in FIG. 14.

In FIG. 13 a relationship is recognized prior to juxtaposition or inversion of both upper assembly 603 and lower assembly 602A noting the general alignment of a stitching or connection interface between connection edges 608, 608 on respective upper assembly 603 and lower assembly 602A. It will be recognized by study of the image that non-connected portion 602C of tread or sole member 601 includes a loose region 609 opposite toe portion 602A.

In FIG. 14, both upper assembly 603 and lower assembly 602B have been juxtaposed or inverted or turned inside-out and are brought into close association along edges 608 and affixed or connected together by stitching 610 or by other methods known to those of skill in the art, such as thermal bonding, adhesive bonding, and combinations thereof. It will be appreciated by those of skill in the art that the surfaces visible in FIG. 14 are what would be the inner surfaces of the complete shoe assembly 600 (FIG. 17) and that the view is of what would be considered an inside-out view.

It will also be appreciated by those of skill in the art having studied the present disclosure that flexible tread portion 601 is hidden from view and is within the inverted assembly, with it's surface-contacting tread portion (if any) facing the outer finished surface 605A′ of tongue member 605A. As connected along edges 608 by stitching or otherwise, it will be recognized that upon further juxtaposition or inversion the connection will be a blind seam or hidden-from view seam similar to that shown earlier in FIGS. 8(A)-8(C), although unlike FIGS. 8(A)-8(C) the lip extension portion is not re-joined to the tread or sole member in a further assembly step.

In FIG. 15, the assembly noted in FIG. 14 is re-juxtaposed or turned right-side-out again hiding seam edges 608 joined by connection 610 forming a type of partial blind-seam between the upper assembly and lower assemblies, as shown. As will also be appreciated, the non-connected portion 602C of tread or sole member 601 remains non-connected. As shown an inner rigid foot support member 611 is inserted and in FIG. 16 is followed by insertion of a rigid foot-shaped last member 612 inside the assembly. Thereafter, adhesive (not shown) is employed to join portions of continuous upper member 603 proximate unsealed tread or sole portion 602C along adhesive or connection juncture 613 forming a continuous connection between upper assembly 603 and lower assembly 602B with lip member 602 there between having a blind seam 610 for by a blind seam or seam creation system or method.

In FIG. 17 heal member 615 is assembled in a manner recognized by those of skill in the shoe assembly arts involving pressure and adhesive to form full shoe embodiment 600 employing the present alternative embodiment of the present invention. It will be recognized by those of skill in the art that multiple connection methods (including stitching, bonding, and adhesive) may be employed to form the connections discussed herein without departing from the scope of the present invention.

In the claims, means- or step-plus-function clauses are intended to cover the structures described or suggested herein as performing the recited function and not only structural equivalents but also equivalent structures. Thus, for example, although a nail, a screw, and a bolt may not be structural equivalents in that a nail relies on friction between a wooden part and a cylindrical surface, a screw's helical surface positively engages the wooden part, and a bolt's head and nut compress opposite sides of a wooden part, in the environment of fastening wooden parts, a nail, a screw, and a bolt may be readily understood by those skilled in the art as equivalent structures.

It will be understood that the invention may be embodied in other specific forms without departing from the spirit or central characteristics thereof. The present examples and embodiments, therefore, are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.

Claims

1. A method of manufacturing footwear comprising the steps of: juxtaposing an upper with an outer surface of an outsole;coupling a forefoot portion of the upper to an inner surface of the outsole; andinverting the upper relative to the outsole, thereby juxtaposing with the inner surface of the insole.

2. The method of claim 1 further comprising coupling a rearfoot portion of the upper to an inner surface of the outsole, wherein an interface between the coupled forefoot portion of the upper and the outsole defines a reinforced forefoot area of the footwear.

3. The method of claim 1, wherein coupling the forefoot portion of the upper to the inner surface of the outsole includes stitching of the upper to the outsole.

4. The method of claim 2, wherein coupling the rearfoot portion of the upper to the inner surface of the outsole includes gluing so as to define a rearfoot area of the footwear.

5. The method of claim 3, wherein the outsole has a forefront peripheral edge extending inwards from the inner surface of the outsole, the upper having a step-like bottom edge including an undercut forefoot edge portion and a rearfoot edge portion, the rearfoot edge portion extending along the rearfoot portion of the upper.

6. The method of claim 5, wherein the undercut forefoot edge portion of the upper overlaps an outer face of the peripheral edge of the outsole, the stitching includes bending the forefoot edge portion and the peripheral edge portion inwards to a stitching position, in which the forefoot edge portion and peripheral edge extend substantially parallel to the inner surface of the outsole during stitching.

7. The method of claim 5, wherein the rearfoot edge portion of the upper is tucked inside and opposes to the inner surface of the outsole so as to form a compartment configured to removably receive a foot of a user.

8. The method of claim 7 further comprising inserting a weight into the compartment and pressing the weigh inwards, thereby gluing the tucked rearfoot edge portion to the inner surface of the outsole.

9. The method of claim 8 further comprising inserting a midsole into the compartment and fixing the midsole therein upon removing the weight from the compartment.

10. The method of claim 1, wherein said step of coupling further comprises: providing a coupling interface member having an upper blind-seam coupling portion extending along an upper edge thereof proximate at least said forefoot portion of said upper, a first bottom outsole coupling portion and a second bottom outsole coupling portion extending respectively along a bottom edge thereof;coupling said first bottom outsole coupling portion of said coupling interface on said bottom edge to said outsole in a first coupling manner;coupling said second bottom outsole coupling portion of said coupling interface on said bottom edge to said outsole in a second coupling manner, said second coupling manner being different from said first coupling manner; andcoupling said upper blind-seam coupling portion to at least said forefoot portion of said upper in a blind-seam manner.

11. The method of claim 10, wherein the blind-seam manner coupling said upper blind-seam coupling portion is a stitching.

12. The method of claim 10, wherein said method comprises coupling a heel to the outer surface of the outsole.

13. A footwear construction comprising: an outsole provided with opposite inner and outer surfaces and a periphery bridging the inner and outer surfaces; andan upper juxtaposed with the outer surface of the outsole and having a peripheral forefoot bottom region;means for coupling the upper juxtaposed outer surface forefoot bottom region with the outsole with the inner surface of the outsole;said means for coupling further coupling a rearfoot bottom region of the upper with to the inner surface of the outsole upon inverting the upper relative to the outsole and the means for coupling after the forefoot bottom region has been coupled to the outsole by the means for coupling the upper juxtaposed outer surface, wherein a coupled interface provided by the means for coupling between the coupled periphery of the outsole and the forefoot bottom region of the upper defines a forefront area of the footwear.

14. The footwear of claim 13, wherein the inner surface of the outsole has a forefront peripheral flange extending transversely and inwardly from the inner surface and overlapping the forefoot bottom region of the upper.

15. The footwear of claim 14, wherein the overlapped forefoot bottom region of the upper and the forefront peripheral flange of the outer sole are operative to flex to a stitching position during coupling to the forefront bottom, in which the forefront bottom region of the upper and forefront peripheral flange extend substantially parallel to the inner surface of the outer.

16. The footwear of claim 15, wherein the inner surface of the outer sole is provided with an elevated central region extending along the forefront area of the footwear and has a trough defined between the elevated central region and the peripheral flange of the outer sole, the trough having a width sufficient to receive the stitched peripheral edge and the forefront bottom region of the upper in the stitching position.

17. The footwear of claim 13, wherein the rearfoot bottom region of the upper is glued to the inner surface of the outsole.

18. The footwear of claim 17, wherein the rearfoot bottom region of the upper has a greater width than the forefront bottom region and is operative to be tucked inside atop the inner surface of the outer sole during gluing.

19. The footwear of claim 13, wherein the rearfoot area of the footwear extends angularly inwards from the forefront area of the foot towards and terminates in a heel area thereof.

20. The footwear of claim 13 further comprising a substantially rigid midsole fixedly coupled to the inner surface of the outer sole so that the forefoot and rearfoot bottom regions of the upper are sandwiched between the inner surface of the outsole and an outer side of the midsole and are displaceably fixed relative thereto.

21. The footwear of claim 13 wherein said means for coupling further comprises a flexible interface coupling member having a generally “U” shaped form and a outsole coupling edge opposite an upper coupling edge between opposing inner and outer surface bridged by a periphery.