Patent Application
20240041160
The present invention relates to an upper for a shoe, in particular a sports shoe.
Shoes, particularly sports shoes usually comprise an upper and a sole secured to that. In this regard, the sole usually comprises a midsole and an outer sole. The upper is to surround the foot of the person wearing it as tightly as possible and, together with the sole, to ensure the best possible force transmission between the foot and the ground. At the same time, the upper and the entire shoe should be as comfortable to wear as possible without overly constraining the foot. Shoes that are too hard or too tight are perceived as unpleasant. Shoes frequently comprise lacing or a hook and loop fastener, for example, through which the upper and the entire shoe may be fixed to the foot with the desired tightness.
Use of lacing or a hook and loop fastener may create pressure that is not evenly distributed along the foot, which may result in pressure sores. Frequently, e.g. only a rather small portion of the bridge of the foot is surrounded very tightly, whereas other parts of the upper are rather loose. Small areas of the foot being tightly surrounded or constrained is perceived as unpleasant, and may limit blood circulation and result in blistering.
It is indeed also possible for a shoe to be loosely tied or fastened by a hook and loop fastener. However, especially in case of sports activities, this loose fastening has a disadvantageous effect, since force transmission from the foot to the ground is affected. Thus, it frequently happens in case of loosely tied shoes that the foot shifts relative to the sole when the person wearing the shoe speeds up, slows down, or turns. Moreover, there is a danger of the person wearing it twisting their ankle and injuring themselves in the process.
Even a shoe that is perceived as pleasant and fitting in the resting state, e.g. when standing, may exert unpleasant pressure on the foot during walking or running. This result may be caused by the fact that the upper does not correctly track the foot's movement of rolling over.
Finally, for economic reasons, shoes are only manufactured in a certain number of sizes and shapes of cobbler's lasts. The shoe size of a person purchasing a shoe may possibly be between two prescribed shoe sizes or shapes of cobbler's lasts. A shoe of the next bigger shoe size would then be too large for them, whereas a shoe of the next smaller shoe size would be too small. Individually adjusting the shoe or even having one made to measure would involve high costs.
Therefore, it is the object of the present invention to provide an upper that removes or at least reduces the described disadvantages of the prior art while being easy and cost-effective to produce. It is a further object to provide a corresponding shoe and specify a method for producing a corresponding upper.
The terms “invention,” “the invention,” “this invention” and “the present invention” used in this patent are intended to refer broadly to all of the subject matter of this patent and the patent claims below. Statements containing these terms should be understood not to limit the subject matter described herein or to limit the meaning or scope of the patent claims below. Embodiments of the invention covered by this patent are defined by the claims below, not this summary. This summary is a high-level overview of various embodiments of the invention and introduces some of the concepts that are further described in the Detailed Description section below. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used in isolation to determine the scope of the claimed subject matter. The subject matter should be understood by reference to appropriate portions of the entire specification of this patent, any or all drawings and each claim.
According to certain embodiments of the present invention, an upper for a shoe comprises at least one first partial area and at least one second partial area that are manufactured as one-piece knitwear, wherein the at least one first partial area comprises a first yarn and the at least one second partial area comprises a second yarn, and wherein the first yarn is more elastic than the second yarn.
In some embodiments, the at least one first partial area and the at least one second partial area are arranged such that the at least one first partial area is configured to be stretched more than the at least one second partial area when the shoe is worn.
In certain embodiments, the one-piece knitwear is weft-knitted. In other embodiments, the one-piece knitwear is warp-knitted.
In some embodiments, the at least one first partial area and the at least one second partial area may run substantially parallel to one another. In other embodiments, the at least one first partial area and the at least one second partial area may run substantially orthogonal to a longitudinal axis of the shoe. In additional embodiments, the at least one first partial area and the least one second partial area may run substantially parallel to one another. In other embodiments, the at least one first partial area and the at least one second partial area may be arranged on one or more of a lateral side and a medial side of a midfoot area of the upper.
In certain embodiments, the at least one first partial area is arranged in an ankle area or in an instep area of the upper.
In further embodiments, the at least one first partial area and the at least one second partial area are arranged substantially symmetrically around a longitudinal axis of the upper.
In some embodiments, the first yarn comprises elastane or rubber.
In certain embodiments, the one-piece knitwear further comprises a monofilament. In further embodiments, the one-piece knitwear further comprises a melt yarn.
In some embodiments, one or both of the at least one first partial area and the at least one second partial area are weft-knitted in intarsia or Jacquard technique.
In some embodiments, the upper surrounds a foot of a wearer at least partially and wherein one or both of the at least one first partial area and the at least one second partial area are at least partially arranged in an area of a sole below the foot of the wearer.
According to certain embodiments of the present invention, a shoe comprises an upper for a shoe comprises at least one first partial area and at least one second partial area that are manufactured as one-piece knitwear, wherein the at least one first partial area comprises a first yarn and the at least one second partial area comprises a second yarn, and wherein the first yarn is more elastic than the second yarn.
According to certain embodiments of the present invention, an upper for a shoe comprises at least one first partial area and at least one second partial area that are manufactured as one-piece knitwear, wherein the at least one first partial area comprises a first yarn and the at least one second partial area comprises a second yarn, wherein the first yarn is more elastic than the second yarn, and the upper surrounds a foot of a wearer at least partially and wherein the at least one first partial area and the at least one second partial area are at least partially arranged in an area of a sole below the foot of the wearer.
In some embodiments, one or both of the at least one first partial area and the at least one second partial area are weft-knitted in intarsia or Jacquard technique.
According to certain embodiments, one or both of the at least one first partial area and the at least one second partial area are at least partially arranged on one or both of a lateral side and a medial side of a midfoot area of the upper. In some embodiments, at least one first partial area and the at least one second partial area are at least partially arranged substantially symmetrically around a longitudinal axis of the upper.
According to certain embodiments of the present invention, a method of manufacturing an upper comprises at least one first partial area and at least one second partial area that are manufactured as one-piece knitwear, wherein the at least one first partial area comprises a first yarn and the at least one second partial area comprises a second yarn, and wherein the first yarn is more elastic than the second yarn, the method comprising manufacturing the at least one first partial area and the at least one second partial area as the one-piece knitwear.
In the following detailed description, embodiments of the invention are described referring to the following figures:
According to certain embodiments of the present invention, a shoe upper for a shoe comprises at least one first partial area and at least one second partial area, which are manufactured as one-piece knitwear, wherein the first partial area comprises a first yarn and the second partial area comprises a second yarn, and wherein the first yarn is more elastic than the second yarn.
Due to the fact first partial area comprises a more elastic yarn, the upper may adjust to the shape of the foot. The pressure on the foot necessary for a good fit is distributed over the surface of the foot by the second partial area, so that pressure sores are avoided. The wear comfort of the shoe as a whole is increased. Moreover, especially in sports shoes, a tightly fitting shoe improves so-called proprioception, i.e. it supports the motion sequence by perceivable feedback to the athlete.
At the same time, the less elastic yarn in the second area causes the upper to be stable on the whole and the foot to be better able to transmit the forces occurring in case of extreme force being exerted, e.g. when speeding up or slowing down, to the ground via the shoe. The second partial area furthermore prevents or reduces shifting of the shoe relative to the sole during high accelerations.
Since the first and the second partial areas are formed as one-piece knitwear, both partial areas are able to interact in an optimum manner and exerted forces may be directly transmitted between the two partial areas. Since seams are furthermore done without, they may neither tear nor be perceived as irritating by the wearer of the shoe. Moreover, the upper is easy and cost-effective to produce, since separately cutting the first and the second partial areas to size and subsequently assembling them may be done without.
The manufacture of both partial areas in one piece may be effected on a weft-knitting or warp-knitting machine, for example, as will be explained in detail below. One or more of the first partial area and the second partial area may comprise connected or unconnected sections, i.e. a partial area does not have to be a contiguous surface. A partial area may e.g. also be composed of two portions which are not adjacent to each other.
Elasticity of the yarn may be measured by a tensile strain being applied to the yarn and the resulting change in length being measured, for example. Elasticity may be specified as Young's modulus, for example. Young's modulus is the quotient of the tensile strain and the resulting elongation, with the elongation specifying the ratio of the change in length to the original length. Young's modulus may be specified as Newton per square meter (N/m2), for example. Thus, a more elastic yarn has a lower Young's modulus than a less elastic yarn.
The different Young's moduli of the first and the second yarn result in different Young's moduli of the first and the second partial areas. For example, the first partial area may comprise a Young's modulus of 0.6 MPa whereas the second partial area may comprise a Young's modulus of 1.88 MPa.
The first partial area and the second partial areas may be arranged such that during wearing of the shoe the first partial area is stretched more than the second partial area. Due to this arrangement, the upper yields in the areas in which it is subject to particularly great stretching during wear. Accordingly, the pressure exerted on the foot is lower than with a conventional upper in these areas. It is e.g. known that increased stretching of the foot occurs when walking barefoot in the rolling-over area between the toe bones and the midfoot area, both medially and laterally. However, only slight extensions occur in the area of the ankle, for example. Accordingly, the first partial area might be located in the rolling-over area between the toe bones and the midfoot area, whereas the second partial area could be arranged in the area of the ankle (also referred to as collar area).
In certain embodiments, the knitwear is weft-knitted. Knitwear may be produced on a weft-knitting machine. A weft-knitting machine may relatively easily provide the knitwear with structures. For example, a weft-knitted fabric may be provided with various weft-knitting structures or weft-knitting patterns in various areas on a weft-knitting machine. In some embodiments, the knitwear is flat weft-knitted. In flat weft-knitting, a certain yarn, e.g. an elastic yarn, may be used in certain, but arbitrary, areas in the weft-knitted fabric.
In additional embodiments, the knitwear is warp-knitted. Knitwear may be cost-effectively and quickly manufactured on a warp-knitting machine.
In some embodiments, the first partial area and the second partial area run substantially parallel. Due to the parallel run, the functions of both areas are complementary. While, due to the elastic yarn, the first partial area ensures that the upper adjusts itself to the shape of the foot, the second partial area, due to its less elastic yarn, causes an optimum force transmission of the foot and thus prevents or reduces shifting of the foot relative to a sole.
In some embodiments, the first and second partial areas run substantially orthogonal to a longitudinal axis of the shoe. This tightly surrounds the foot and laterally exerted forces are diverted through the second partial area. Moreover, this arrangement enables adjustment in size of the shoe in the longitudinal direction.
In some embodiments, the first and second partial areas are arranged on one or more of a lateral and a medial side of the midfoot area of the upper. Especially the midfoot area is important for a good fit and force transmission. Due to the arrangement of the first partial area and/or the second partial area on one or more of a lateral side and a medial side, the foot is stabilized in case of forces being exerted on the sides, as occur in tennis, for example.
On principle, the arrangement of the first partial area and the second partial area may vary depending on the type of sport. In types of sports with predominantly lateral stresses, such as tennis, the second partial area, which comprises the second, less elastic yarn, may be arranged mainly in the lateral area. This results in an asymmetrical distribution of the first and the second partial area. In types of sports with predominantly linear stresses, such as running, the first and the second area may be arranged rather symmetrically.
In some embodiments, the first partial area is arranged in the ankle area (also referred to as collar area) of the upper. Alternatively or additionally, the first partial area is arranged in the instep area of the upper. In these areas, unpleasant pressure sores frequently occur. This may be counteracted due to the arrangement of the first partial area with the elastic yarn in these areas. The arrangement in the first partial area in the ankle region also facilitates putting the shoe on. Moreover, the upper may adapt to various instep heights. Lacing could be done without.
In some embodiments, the first partial area and the second partial area are arranged substantially symmetrically around a longitudinal axis of the upper. A symmetrical arrangement of the two partial areas ensures an even distribution of pressure on the foot.
In some embodiments, the first yarn comprises elastane or rubber. Both materials are of high ductility, so that the upper is able to exert the necessary pressure on the foot and the upper is able to adjust itself to different sizes of feet. It would be conceivable, for example, that a size of the upper covers a range of sizes of feet, so that it is not necessary to produce uppers for all sizes of feet. Certain intermediate sizes would be omitted, so that storage costs would be reduced.
The knitwear may further comprise a monofilament. The knitwear may be additionally reinforced and given stability in specific places by a monofilament. In certain embodiments, the second partial area comprises a monofilament. This achieves higher stability, which may be beneficial in the heel area, the toe area, and/or the lateral midfoot area.
According to certain embodiments, the knitwear further comprises a melting yarn. A melting yarn may be fused by heating. The melting yarn hardens when it is subsequently cooled down. In this way, the knitwear may be specifically stiffened. In some embodiments, the second partial area comprises a melt yarn. This achieves higher stability. This may be beneficial in the heel area, the toe area, and/or the lateral midfoot area.
In certain embodiments of the present invention, one or more of the first partial area and the second partial area are weft-knitted in intarsia or Jacquard technique. Intarsia or Jacquard technique allow it in a simple manner to manufacture neighboring partial areas with different yarns when weft-knitting or warp-knitting knitwear.
In some embodiments, the upper surrounds the foot of a person wearing it at least partially and one or more of the first partial area and the second partial area are at least partially arranged in the area of the sole. Due to this arrangement, the upper closely fits the foot and provides high stability also in the area of the sole. The upper matches the foot in an ideal manner along its entire circumference. For example, in case of shoes of a moccasin construction, the upper surrounds the foot of the wearer only partially, that is, on the forefoot area. In other shoe constructions, the upper may fully surround the foot.
According to further embodiments of the present invention, a shoe, particularly a sports shoe, comprises an upper described above.
According to yet other embodiments of the present invention, a method of producing an upper described above comprises the step of manufacturing at least one first partial area and at least one second partial area as one-piece knitwear.
The subject matter of embodiments of the present invention is described here with specificity to meet statutory requirements, but this description is not necessarily intended to limit the scope of the claims. The claimed subject matter may be embodied in other ways, may include different elements or steps, and may be used in conjunction with other existing or future technologies. This description should not be interpreted as implying any particular order or arrangement among or between various steps or elements except when the order of individual steps or arrangement of elements is explicitly described.
In the following, embodiments and variations of the present invention are described in more detail on the basis of an upper for a shoe, in particular a sports shoe.
The use of knitwear allows products such as an upper or a sole of a shoe, such as an insole, strobel sole, midsole and/or outer sole to be equipped with areas having different characteristics and providing different functions with low production effort. The properties include bendability, stretchability (expressed as Young's modulus, for example), permeability to air and water, thermoconductivity, thermal capacity, moisture absorption, static friction, abrasion resistance, hardness, and thickness, for example.
Various techniques are applied in order to achieve such characteristics or functions, which will be described in the following. Such suitable techniques in manufacturing knitwear include knitting techniques, the selection of fibers and yarns, coating the fibers, yarns or knitwear with polymer or other materials, the use of monofilaments, the combination of monofilaments and polymer coating, the application of fuse/melt yarns, and multi-layer textile material. In general, the yarns used for the manufacture of knitwear may be equipped, i.e. coated accordingly. In addition or alternatively, the finished knitwear may be equipped accordingly.
Another aspect of providing functions concerns the specific use of knitwear for certain areas of a product, for example of an upper or a sole, and the connection of different parts by suitable connection techniques. The mentioned aspects and techniques as well as other aspects and techniques will be explained in the following.
The described techniques may be used individually or they may be combined in any manner.
Knitwear used in the present invention is divided into weft-knitted fabrics and single-thread warp-knitted fabrics on the one hand and multi-thread warp-knitted fabrics on the other hand. The distinctive characteristic of knitwear is that it is formed of interlocking yarn or thread loops. These thread loops are also referred to as stitches and may be formed of one or several yarns or threads.
Yarn or thread are terms for a structure of one or several fibers which is long in relation to its diameter. A fiber is a flexible structure which is rather thin in relation to its length. Very long fibers, of virtually unlimited length with regard to their use, are referred to as filaments. Monofilaments are yarns formed of one single filament, that is, one single fiber.
In weft-knitted fabrics and single-thread warp-knitted fabrics, the stitch formation requires at least one thread or yarn, with the thread running in longitudinal direction of the product, i.e. substantially at a right angle to the direction in which the product is made during the manufacturing process. In multi-thread warp-knitted fabrics, the stitch formation requires at least one warp sheet, i.e. a plurality of so-called warps. These stitch-forming threads run in longitudinal direction, i.e. substantially in the direction in which the product is made during the manufacturing process.
Certain embodiments of a weft-knitted fabric that may be used for the present invention with a filler yarn 15 is shown in
Multi-thread warp-knitted fabric 13 is created by warp-knitting with many threads from top down, as shown in
By way of example, the interlaces tricot 21, 2×1 plain 22, and atlas 23 are shown in
Stitches arranged above each other with joint binding sites are referred to as wales.
Three basic weft-knitted structures are known in weft-knitted fabrics, which may be recognized by the run of the stitches along a wale. With plain, single Jersey, only back loops may be recognized along a wale on one side of the fabric and only back loops may be recognized along the other side of the product. This structure is created on one row of needles of a knitting machine, i.e. an arrangement of neighboring knitting needles, and also referred to as single Jersey. With rib fabric, front and back loops alternate within a course, i.e. either only front or back loops may be found along a wale, depending on the side of the product from which the wale is considered. This structure is created on two rows of needles with needles offset opposite each other. With purl fabric, front and back loops alternate in one wale. Both sides of the product look the same. This structure is manufactured using latch needles as illustrated in
In many embodiments, a variety of structures and surfaces that may be created with knitwear, which may or may not also be possible with weaving. It is possible to manufacture both very heavy and/or stiff knitwear and very soft, transparent and/or stretchable knitwear with substantially the same manufacturing technique. The parameters by which the properties of the material may be influenced substantially are the pattern of weft-knitting or warp-knitting, the used yarn, the needle size or the needle distance, and the tensile strain subject to which the yarn is placed on the needles.
In certain embodiments of weft-knitting, yarns may be weft-knitted in at freely selectable places. In this manner, selected zones may be provided with certain properties. For example, an upper for a soccer shoe may be provided with zones made from rubberized yarn in order to achieve higher static friction and thus enable the player to better control the ball. With certain yarns being weft-knitted in at selected places, no additional elements have to be applied.
Knitwear is manufactured on machines in the industrial context. These machines usually comprise a plurality of needles. In weft-knitting, latch needles 41 are usually used, which may comprise a moveable latch 42, as illustrated in
A differentiation is made between flat-knitting and circular-knitting machines. In flat-knitting machines, a thread feeder feeds the thread back and forth along a row of needles. In a circular-knitting machine, the needles are arranged in a circular manner and the thread feeding correspondingly takes place in a circular movement along one or more round rows of needles.
Instead of a single row of needles, it is also possible for a knitting machine to comprise two parallel rows of needles. When looked at from the side, the needles of the two rows of needles may, for example, be opposite each other at a right angle. This enables the manufacture of more elaborate structures or weaves. The use of two rows of needles allows the manufacture of a one-layered or two-layered weft-knitted fabric. A one-layered weft-knitted fabric is created when the stitches generated on the first row of needles are enmeshed with the stitches generated on the second row of needles. Accordingly, a two-layered weft-knitted fabric is created when the stitches generate on the first row of needles are not or only selectively enmeshed with the stitches generated on the second row of needles and/or if they are merely enmeshed at the end of the weft-knitted fabric. If the stitches generated on the first row of needles are loosely enmeshed only selectively with the stitches generated on the second row of needles by an additional yarn, this is also referred to as spacer weft-knitted fabric. The additional yarn, for example a monofilament, is thus guided back and forth between two layers, so that a distance between the two layers is created. The two layers may e.g. be connected to each other via a so-called tuck stitch.
Generally, the following weft-knitted fabrics may thus be manufactured on a weft-knitting machine: If only one row of needles is used, a one-layered weft-knitted fabric may be created. When two rows of needles are used, the stitches of both rows of needles may consistently be connected to each other so that the resulting knitwear comprises a single layer. If the stitches of both rows of needles are not connected or only connected at the edge when two rows of needles are used or are only selectively connected in certain locations, two layers are created. If the stitches of both rows of needles are connected selectively in turns by an additional thread, a spacer weft-knitted fabric is created. The additional thread is also referred to as spacer thread and it may be fed via a separate yarn feeder.
In certain embodiments, single-thread warp-knitted fabrics may be manufactured by jointly moved needles. In other embodiments, single-thread warp-knitted fabrics needles may be manufactured by fixing the needles and moving the fabric to create the relative motion between the needles and the fabric. In contrast to weft-knitting, the needles are typically not moved individually. Similar to weft-knitting, there are flat single thread warp-knitting and circular single thread warp-knitting machines.
In multi-thread warp-knitting, one or several coiled threads, i.e. threads which are coiled next to one another, are used. In stitch formation, the individual warps are placed around the needles and the needles are moved jointly.
The techniques described herein as well as further aspects of the manufacture of knitwear may be found in “Fachwissen Bekleidung”, 6th ed. by H. Eberle et al. (published with the title “Clothing Technology” in English), in “Textil- und Modelexikon”, 6th ed. by Alfons Hofer and in “Maschenlexikon”, 11th ed. by Walter Holthaus, for example.
Three-dimensional (3D) knitwear may also be manufactured on weft-knitting machines and warp-knitting machines, particularly on flat-knitting machines. This is knitwear comprises a spatial structure although it is weft-knitted or warp-knitted in a single process. A three-dimensional weft-knitting or warp-knitting technique allows for spatial knitwear to be manufactured without seams, cut or manufacture in one piece and in a single process.
Three-dimensional knitwear may, for example, be manufactured by varying the number of stitches in the direction of the wales by partial courses being formed. The corresponding mechanical process is referred to as “needle parking”. Depending on the requirement, this technique may be combined with structural variations and/or variations of the number of stitches in the direction of the course. When partial courses are formed, stitch formation temporarily occurs only along a partial width of the weft-knitted fabric or warp-knitted fabric. The needles which are not involved in the stitch formation keep the half stitches (“needle parking”) until weft-knitting occurs again at this position. In this way, it is possible to form bulges, for example.
By three-dimensional weft-knitting or warp-knitting, an upper may be adjusted to the cobbler's last or the foot and a sole may be profiled, for example. The tongue of a shoe may e.g. be weft-knitted into the right shape. Contours, structures, knobs, curvatures, notches, openings, fasteners, loops and pockets may be integrated into the knitwear in a single process.
Three-dimensional knitwear may be used for the present invention in an advantageous manner.
According to certain embodiments of the present invention, knitwear and particularly weft-knitted fabric may be provided with a range of functional properties and used in the present invention.
It is possible using a weft-knitting technique to manufacture knitwear having different functional areas and simultaneously maintaining its contours. The structures of knitwear may be adjusted to functional requirements in certain areas, by the stitch pattern, the yarn, the needle size, the needle distance or the tensile strain subject to which the yarn is placed on the needles being selected accordingly.
It is possible, for example, to include structures with large stitches or openings within the knitwear in areas in which airing is desired. In contrast, in areas in which support and stability are desired, fine-meshed stitch patterns, stiffer yarns or even multi-layered weft-knitting structures may be used, which will be described in the following. In the same manner, the thickness of the knitwear is variable.
Knitwear having more than one layer provides numerous possible constructions for the knitwear, which provide many advantages. Knitwear with more than one layer, e.g. two, may be weft-knitted or warp-knitted on a weft-knitting machine or a warp-knitting machine with several rows of needles, e.g. two, in a single stage, as described in the section “knitwear” above. Alternatively, several layers, e.g. two, may be weft-knitted or warp-knitted in separate stages and then placed above each other and connected to each other if applicable, e.g. by sewing, gluing, welding or linking.
Several layers fundamentally increase solidness and stability of the knitwear. In this regard, the resulting solidness depends on the extent to which and the techniques by which the layers are connected to each other. The same yarn or different yarns may be used for the individual layers. For example, it is possible in a weft-knitted fabric for one layer to be weft-knitted from multi-fiber yarn and one layer to be weft-knitted from monofilament, whose stitches are enmeshed. In particular, stretchability of the weft-knitted layer is reduced due to this combination of different yarns. In this construction, a layer made from monofilament may be arranged between two layers made from multi-fiber yarn in order to reduce stretchability and increase solidness of the knitwear. This results in a pleasant surface made from multi-fiber yarn on both sides of the knitwear.
An alternative of two-layered knitwear is referred to as spacer weft-knitted fabric or spacer warp-knitted fabric, as explained in the section “knitwear”. In this regard, a spacer yarn is weft-knitted or warp-knitted more or less loosely between two weft-knitted or warp-knitted layers, interconnecting the two layers and simultaneously serving as a filler. The spacer yarn may comprise the same material as the layers themselves, e.g. polyester or another material. The spacer yarn may also be a monofilament which provides the spacer weft-knitted fabric or spacer warp-knitted fabric with stability.
Such spacer weft-knitted fabrics or spacer warp-knitted fabrics, respectively, which are also referred to as three-dimensional weft-knitted fabrics, which are differentiated from the formative 3D weft-knitted fabrics or 3D warp-knitted fabrics mentioned in the section “three-dimensional knitwear” above, may be used wherever additional cushioning or protection is desired, e.g. at the upper or the tongue of an upper or in certain areas of a sole. Three-dimensional structures may also serve to create spaces between neighboring textile layers or also between a textile layer and the foot and thus ensure airing. Moreover, the layers of a spacer weft-knitted fabric or a spacer warp-knitted fabric may comprise different yarns depending on the position of the spacer weft-knitted fabric on the foot.
The thickness of a spacer weft-knitted fabric or a spacer warp-knitted fabric may be set in different areas depending on the function or the wearer. Various degrees of cushioning may be achieved with areas of various thicknesses, for example. Thin areas may increase bendability, for example, thus fulfilling the function of joints or flex lines.
Moreover, the layers of a spacer weft-knitted fabric may comprise different yarns depending on the position of the spacer weft-knitted fabric on the foot. In this way, knitwear may be provided with two different colors for the front and the back, for example. An upper made from such knitwear may then comprise a different color on the outside than on the inside.
Other multi-layered constructions may include pockets or tunnels, in which two textile layers or knitwear weft-knitted or warp-knitted on two rows of needles are connected to each other only in certain areas so that a hollow space is created. Alternatively, items of knitwear weft-knitted or warp-knitted in two separate processes are connected to each other such that a void is created, e.g. by sewing, gluing, welding or linking. It is then possible to introduce a cushioning material such as a foam material, eTPU (expanded thermoplastic urethane), ePP (expanded polypropylene), expanded EVA (ethylene vinyl acetate) or particle foam, an air or gel cushion for example, through an opening, e.g. at the tongue, the upper, the heel, the sole or in other areas. Alternatively or additionally, the pocket may also be filled with a filler thread or a spacer knitwear. It is furthermore possible for threads to be pulled through tunnels, for example as reinforcement in case of tension loads in certain areas of an upper. Moreover, it is also possible for the laces to be guided through such tunnels. Moreover, loose threads may be placed into tunnels or pockets for padding, for example in the area of the ankle. However, it is also possible for stiffer reinforcing elements, such as caps, flaps or bones to be inserted into tunnels or pockets. These may be manufactured from plastic such as polyethylene, TPU, polyethylene or polypropylene, for example.
A further possibility for a functional design of knitwear is the use of certain variations of the basic weaves. In weft-knitting, it is possible for bulges, ribs or waves to be weft-knitted in certain areas, for example, in order to achieve reinforcement in these places. A wave may, for example, be created by stitch accumulation on a layer of knitwear. This means that more stitches are weft-knitted or warp-knitted on one layer than on another layer. Alternatively, different stitches are weft-knitted fabric on the one layer than on the other layer, e.g. by being weft-knitted fabric tighter, wider or using a different yarn. Thickening is caused in both alternatives.
Ribs, waves, or similar patterns may, for example, also be used at the bottom of a weft-knitted outer sole of a shoe in order to provide a tread and provide the shoe with better non-slip properties. In order to obtain a rather thick weft-knitted fabric, for example, it is possible to use the weft-knitting techniques “tuck” or “half cardigan”, which are described in “Fachwissen Bekleidung”, 6th ed. by H. Eberle et al., for example.
Waves may be weft-knitted or warp-knitted such that a connection is created between two layers of a two-layered knitwear or such that no connection is created between the two layers. A wave may also be weft-knitted as a right-left wave on both sides with or without a connection of the two layers. A structure in the knitwear may be achieved by an uneven ration of stitches on the front or the back of the knitwear.
A further possibility of functionally designing knitwear within the framework of the present invention is providing openings in the knitwear already during weft-knitting or warp-knitting. Embodiments in the course of the present invention, which may be combined with other embodiments, refer to an insole that comprises knitwear. The embodiments may also be applied to a strobel sole, however. The embodiments may equally be applied to an outer sole. An insole, strobel sole, or outer sole is generally arranged above a midsole. The midsole may comprise cushioning properties. The midsole may e.g. comprise a foam material. Other suitable materials are eTPU (expanded thermoplastic urethane), ePP (expanded polypropylene), expanded EVA (ethylene vinyl acetate) or particle foam, for example.
The knitwear of the insole, strobel sole, or outer sole comprises at least one opening which is weft-knitted or warp-knitted in already during weft-knitting or warp-knitting of the knitwear, respectively. The at least one opening enables the foot of a wearer of a shoe to be able to directly touch the midsole. This improves the cushioning properties of the shoe on the whole, so that the thickness of the midsole may be reduced.
In some embodiments, the at least one opening is arranged in the area of the calcaneus. An arrangement in this position has a particularly positive effect on the cushioning properties. A different position of the at least one opening is also possible.
In certain embodiments, functionally designing knitwear within the framework may include forming laces integrally with the knitwear of an upper. In these embodiments, the upper comprises knitwear and the laces are warp-knitted or weft-knitted as one piece with the knitwear already when the knitwear of the upper is weft-knitted or warp-knitted. In this regard, a first end of a lace is connected to the knitwear, while a second end is free.
In some embodiments, the first end is connected to the knitwear of the upper in the area of the transition from the tongue to the area of the forefoot of the upper. In these embodiments, a first end of a first lace may be connected to the knitwear of the upper at the medial side of the tongue and a first end of a second lace is connected to the knitwear of the upper at the lateral side of the tongue. The respective second ends of the two laces may then be pulled through lace eyelets for tying the shoe.
A possibility of speeding up the integral weft-knitting or warp-knitting of laces is having all yarns used for weft-knitting or warp-knitting knitwear end in the area of the transition from the tongue to the area of the forefoot of the upper. In some embodiments, the yarns may end in the medial side of the upper on the medial side of the tongue and form the lace connected on the medial side of the tongue. In certain embodiments, the yarns may end in the lateral side of the upper on the lateral side of the tongue and form the lace connected to the lateral side of the tongue. The yarns may then be cut off at a length that is sufficiently long for forming laces. The yarns may be twisted or intertwined, for example. The respective second end of the laces may be provided with a lace clip. Alternatively, the second ends are fused or provided with a coating.
The knitwear is particularly stretchable in the direction of the stitches (longitudinal direction) due to its construction. This stretching may be reduced e.g. by subsequent polymer coating of the knitwear. The stretching may also be reduced during manufacture of the knitwear itself. One possibility is reducing the mesh openings, that is, using a smaller needle size. Smaller stitches generally result in less stretching of the knitwear. Fine-meshed knitwear may e.g. be used at an upper (also referred to as shoe upper). Moreover, the stretching of the knitwear may be reduced by weft-knitted reinforcements, e.g. three-dimensional structures. Such structures may be arranged on the inside or the outside of an upper. Furthermore, non-stretchable yarn, e.g. made from nylon, may be laid in a tunnel along the knitwear in order to limit stretching to the length of the non-stretchable yarn.
Colored areas with several colors may be created by using a different thread and/or by additional layers. In transitional areas, smaller mesh openings (smaller needle sizes) are used in order to achieve a fluent passage of colors.
Further effects may be achieved by weft-knitted insets (inlaid works) or Jacquard knitting. Inlaid works are areas which only provide a certain yarn, e.g. in a certain color. Neighboring areas which may comprise a different yarn, for example in a different color, are then connected to each other by a so-called tuck stitch.
During Jacquard knitting, two rows of needles are used and two different yarns run through all areas, for example. However, in certain areas only one yarn appears on the visible side of the product and the respective other yarn runs invisibly on the other side of the product.
A product manufactured from knitwear may be manufactured in one piece on a weft-knitting machine or a warp-knitting machine. Functional areas may then already be manufactured during weft-knitting or warp-knitting by corresponding techniques as described here.
Alternatively, the product may be combined from several parts of knitwear and it may also comprise parts that are not manufactured from knitwear. In this regard, the parts of knitwear may each be designed separately with different functions, for example regarding thickness, isolation, transport of moisture, etc.
An upper and/or a sole may, for example, be generally manufactured from knitwear as a whole or it may be put together from different parts of knitwear. A whole upper or parts of that may, for example, be separated, e.g. punched, from a larger piece of knitwear. The larger piece of knitwear may, for example, be a circular weft-knitted fabric or a circular warp-knitted fabric or a flat weft-knitted fabric or a flat warp-knitted fabric.
For example, a tongue may be manufactured as a continuous piece and connected with the upper subsequently, or it may be manufactured in one piece with the upper. With regard to their functional designs, ridges on the inside may e.g. improve flexibility of the tongue and ensure that a distance is created between the tongue and the foot, which provides additional airing. Laces may be guided through one or several weft-knitted tunnels of the tongue. The tongue may also be reinforced with polymer in order to achieve stabilization of the tongue and e.g. prevent a very thin tongue from convolving. Moreover, the tongue may then also be fitted to the shape of the cobbler's last or the foot.
In an upper, it is possible for only the front part to be manufactured from knitwear, for example. The remainder of the upper may comprise a different textile and/or material, such as a woven fabric, for example. The front part may e.g. be located only in the area of the toes, extend beyond the toe joints or into the midfoot area. Alternatively, the back part of an upper may be manufactured from knitwear in the area of the heel, for example, and e.g. be additionally reinforced with polymer coating. In general, any desired areas of an upper or a sole may be manufactured as knitwear.
Applications such as polyurethane (PU) prints, thermoplastic polyurethane (TPU) ribbons, textile reinforcements, leather, etc., may be applied to knitwear subsequently. Thus, in an upper which comprises knitwear in its entirety or in parts, a plastic heel or toe cap as reinforcement or logos and eyelets for laces may be applied on the upper, for example by sewing, gluing or welding, as described below.
Sewing, gluing or welding, for example, constitute suitable connection techniques for connecting individual knitwear with other textiles or with other knitwear. Linking is another possibility for connecting two pieces of knitwear. Therein, two edges of knitwear are connected to each other according to the stitches (usually stitch by stitch).
A possibility for welding textiles, particularly ones made from plastic yarns or threads, is ultrasonic welding. Therein, mechanical oscillations in the ultrasonic frequency range are transferred to a tool referred to as a sonotrode. The oscillations are transferred to the textiles to be connected by the sonotrode under pressure. Due to the resulting friction, the textiles are heated up, softened and ultimately connected in the area of the place of contact with the sonotrode. Ultrasonic welding allows rapidly and cost-effectively connecting particularly textiles with plastic yarns or threads. It is possible for a ribbon to be attached, for example glued, to the weld seam, which additionally reinforces the weld seam and is optically more appealing. Moreover, wear comfort is increased since skin irritations—especially at the transition to the tongue—are avoided.
Connecting various textile areas may occur at quite different locations. For example, the seams for connecting various textile areas of an upper may be arranged at various positions, as shown in
In certain embodiments, adhesive tape may be used to connect textile areas. This feature may also be used in addition to an existing connection, e.g. over a sewn seam or a welded seam. An adhesive tape may fulfill further functions in addition to the function of connecting, such as e.g. protection against dirt or water. An adhesive tape may comprise properties which change over its length.
Embodiments of an upper 51 connected to a shoe sole 61 using adhesive tape are shown in
The shoe sole 61 may be an outer sole or a midsole. The upper 51 and the shoe sole 61 are connected to each other by a surrounding adhesive tape 62. The adhesive tape 62 may be of varying flexibility along its length. For example, the adhesive tape 62 might be particularly rigid and not very flexible in the shoe's heel area in order to provide the shoe with the necessary stability in the heel area. This may be achieved by varying the width and/or the thickness of the adhesive tape 62, for example. The adhesive tape 62 may generally be constructed such that it is able to receive certain forces in certain areas along the tape. In this way, the adhesive tape 62 does not only connect the upper to the sole but simultaneously fulfills the function of structural reinforcement.
The yarns or threads, respectively, used for knitwear of the present invention usually comprise fibers. As was explained above, a flexible structure which is rather thin in relation to its length is referred to as a fiber. Very long fibers, of virtually unlimited length with regard to their use, are referred to as filaments. Fibers are spun or twisted into threads or yarns. Fibers may also be long, however, and twirled into a yarn. Fibers may include natural or synthetic materials. Natural fibers are environmentally friendly, since they are compostable. Natural fibers include cotton, wool, alpaca, hemp, coconut fibers or silk, for example. Among the synthetic fibers are polymer-based fibers such as nylon, polyester, elastane, or spandex, respectively, or Kevlar® or other para-aramid synthetic fiber, which may be produced as classic fibers or as high-performance fibers or technical fibers.
It is conceivable that a shoe be assembled from various parts, with a weft-knitted or a warp-knitted part comprising natural yarn made from natural fibers and a removable part, e.g. the insole, comprising plastic, for example. In this manner, both parts may be disposed of separately. In this example, the weft-knitted part could be directed to compostable waste, whereas the insole could be directed to recycling of reusable materials, for example.
The mechanical and physical properties of a fiber and the yarn manufactured therefrom are also determined by the fiber's cross-section, as illustrated in
A fiber having the circular cross-section 710 may either be solid or hollow. A solid fiber is the most frequent type, it allows easy bending and is soft to the touch. A fiber as a hollow circle with the same weight/length ratio as the solid fiber has a larger cross-section and is more resistant to bending. Examples of fibers with a circular cross-section are nylon, polyester, and Lyocell.
A fiber having the bone-shaped cross-section 730 has the property of wicking moisture. Examples for materials for such fibers are acrylic and spandex. The concave areas in the middle of the fiber support moisture being passed on in the longitudinal direction, with moisture being rapidly wicked from a certain place and distributed.
The following further cross-sections are illustrated in
Individual fibers with their properties which are relevant for the manufacture of knitwear for the present invention will be described in the following:
A plurality of different yarns may be used for the manufacture of knitwear according to certain embodiments in the present invention. As was already defined, a structure of one or several fibers which is long in relation to its diameter is referred to as a yarn.
Functional yarns are capable of transporting moisture and thus of absorbing sweat and moisture. They may be electrically conducting, self-cleaning, thermally regulating and insulating, flame resistant, and UV-absorbing, and may enable infrared radiation. They may be suitable for sensors. Antibacterial yarns, such as silver yarns, for example, prevent odor formation.
Stainless steel yarn contains fibers made of a blend of nylon or polyester and steel. Its properties include high abrasion resistance, high cut resistance, high thermal abrasion, high thermal and electrical conductivity, higher tensile strength and high weight.
In textiles made from knitwear, electrically conducting yarns may be used for the integration of electronic devices. These yarns may, for example, forward impulses from sensors to devices for processing the impulses, or the yarns may function as sensors themselves, and measure electric streams on the skin or physiological magnetic fields, for example. Examples for the use of textile-based electrodes may be found in European patent application EP 1 916 323.
Melt yarns may be a mixture of a thermoplastic yarn and a non-thermoplastic yarn. There are substantially three types of melt yarns: a thermoplastic yarn surrounded by a non-thermoplastic yarn; a non-thermoplastic yarn surrounded by thermoplastic yarn; and pure melt yarn of a thermoplastic material. After being heated to the melting temperature, thermoplastic yarn fuses with the non-thermoplastic yarn (e.g. polyester or nylon), stiffening the knitwear. The melting temperature of the thermoplastic yarn is determined accordingly and it is usually lower than that of the non-thermoplastic yarn in case of a mixed yarn.
A shrinking yarn is a dual-component yarn. The outer component is a shrinking material, which shrinks when a defined temperature is exceeded. The inner component is a non-shrinking yarn, such as polyester or nylon. Shrinking increases the stiffness of the textile material.
A further yarn for use in knitwear are luminescent or reflecting yarns and so-called “intelligent” yarns. Examples of intelligent yarns are yarns which react to humidity, heat or cold and alter their properties accordingly, e.g. contracting and thus making the stitches smaller or changing their volume and thus increasing permeability to air. Yarns made from piezo fibers or yarn coated with a piezo-electrical substance are able to convert kinetic energy or changes in pressure into electricity, which may provide energy to sensors, transmitters or accumulators, for example.
Yarns may furthermore generally be reworked, e.g. coated, in order to maintain certain properties, such as stretching, color or humidity resistance.
Due to its structure, weft-knitted or warp-knitted knitwear is considerably more flexible and stretchable than weaved textile materials. For certain applications and requirements, e.g. in certain areas of an upper or a sole according to the present invention, it is therefore necessary to reduce flexibility and stretchability in order to achieve sufficient stability.
For that purpose, a polymer layer may be applied to one side or both sides of knitwear (weft-knit or warp-knit goods), but generally also to other textile materials. Such a polymer layer causes a reinforcement and/or stiffening of the knitwear. In an upper it may e.g. serve the purpose of supporting and/or stiffening and/or reducing elasticity in the toe area, in the heel area, along the lace eyelets, on lateral and/or medial surfaces or in other areas. Furthermore, elasticity of the knitwear and particularly stretchability are reduced. Moreover, the polymer layer protects the knitwear against abrasion. Furthermore, it is possible to give the knitwear a three-dimensional shape using the polymer coating by compression-molding.
In the first step of polymer coating, the polymer material may applied to one side of the knitwear. It may also be applied on both sides, however. The material may be applied by spraying, knife coating, laying, printing, sintering, ironing or spreading. If it is polymer material in the form of a film, the latter is placed on the knitwear and connected with the knitwear by heat and pressure, for example. Spraying may be carried out by a tool similar to a hot glue gun. Spraying enables the polymer material to be applied evenly in thin layers. Moreover, spraying is a fast method. Effect pigments such as color pigments, for example, may be mixed into the polymer coating.
According to certain embodiments, the polymer is applied in at least one layer with a thickness of 0.2-1 mm. One or several layers may be applied, with it being possible for the layers to be of different thicknesses and/or colors. Between neighboring areas with polymer coating of various thicknesses there may be continuous transitions from areas with a thin polymer coating to areas with a thick polymer coating. In the same manner, different polymer materials may be used in different areas, as will be described in the following.
During application, polymer material attaches itself to the points of contact or points of intersection, respectively, of the yarns of the knitwear, on the one hand, and to the gaps between the yarns, on the other hand, forming a closed polymer surface on the knitwear after the processing steps described in the following. However, in case of larger mesh openings or holes in the textile structure, this closed polymer surface may also be intermittent, e.g. so as to enable airing. This also depends on the thickness of the applied material: The more thinly the polymer material is applied, the easier it is for the closed polymer surface to be intermittent. Moreover, the polymer material may also penetrate the yarn and soak it and thus contributes to its stiffening.
After application of the polymer material, the knitwear is pressed in a press under heat and pressure. The polymer material liquefies in this step and fuses with the yarn of the textile material.
In a further optional step, the knitwear may be pressed into a three-dimensional shape in a machine for compression-molding. For example, the area of the heel or the area of the toes of an upper may be shaped three-dimensionally over a cobbler's last. Alternatively, the knitwear may also be directly fitted to a foot.
After pressing and molding, the reaction time until complete stiffening may be one to two days, depending on the used polymer material.
The following polymer materials may be used: polyester; polyester-urethane pre-polymer; acrylate; acetate; reactive polyolefins; co-polyester; polyamide; co-polyamide; reactive systems (mainly polyurethane systems reactive with H2O or O2); polyurethanes; thermoplastic polyurethanes; and polymeric dispersions.
A suitable range for viscosity of the polymer material is 50-80 Pa s (pascal second) at 90-150° C., which may further include a range of 15-50 Pa s (pascal second) at 110-150° C.
A suitable range for the hardness of the hardened polymer material is 40-60 Shore D. Depending on the application, other ranges of hardness are also conceivable.
The described polymer coating may be used sensibly wherever support functions, stiffening, increased abrasion resistance, elimination of stretchability, increase of comfort and/or fitting to prescribed three-dimensional geometries are desired. It is also conceivable to fit e.g. an upper to the individual shape of the foot of the person wearing it, by polymer material being applied to the upper and then adapting to the shape of the foot under heat.
As was already defined, a monofilament is a yarn formed by one single filament, that is, one single fiber. Therefore, in certain embodiments, stretchability of monofilaments is considerably lower than that of yarns which are manufactured from many fibers. This also reduces the stretchability of knitwear that is manufactured from monofilaments or include monofilaments and which are used in the present invention. Monofilaments are typically made from polyamide. However, other materials, such as polyester or a thermoplastic material, would also be conceivable.
So whereas knitwear made from a monofilament is considerably more rigid and less stretchable, this knitwear may not include the desired surface properties, such as e.g. smoothness, colors, transport of moisture, outer appearance and variety of textile structures as usual knitwear has. This disadvantage is overcome by the knitwear described in the following.
A monofilament may also be melted slightly in order to connect with the layer of the first yarn and limit stretching even more. The monofilament then fuses with the first yarn at the points of contact and fixates the first yarn with respect to the layer made from monofilament.
The weft-knitted fabric having two layers described in the preceding section may additionally be reinforced by a polymer coating as was already described in the section “polymer coating”. The polymer material is applied to the weft-knitted layer made from monofilament. In doing so, it does not connect to the material (e.g. polyamide material) of the monofilament, since the monofilament has a very smooth and round surface, but substantially penetrates the underlying first layer of a first yarn (e.g. polyester yarn). During subsequent pressing, the polymer material therefore fuses with the yarn of the first layer and reinforces the first layer. In doing so, the polymer material has a lower melting point than the first yarn of the first layer and the monofilament of the second layer. The temperature during pressing is selected such that only the polymer material melts but not the monofilament or the first yarn.
For reinforcement and for the reduction of stretching, the yarn of the knitwear which is used according to the invention may additionally or alternatively also be a melt yarn that fixes the knitwear after pressing. There are substantially three types of melt yarns: a thermoplastic yarn surrounded by a non-thermoplastic yarn; a non-thermoplastic yarn surrounded by thermoplastic yarn; and pure melt yarn of a thermoplastic material. In order to improve the bond between thermoplastic yarn and the non-thermoplastic yarn, it is possible for the surface of the non-thermoplastic yarn to be texturized.
In certain embodiments, pressing takes place at a temperature ranging from 110 to 150° C., and may further be approximately 130° C. The thermoplastic yarn melts at least partially in the process and fuses with the non-thermoplastic yarn. After pressing, the knitwear is cooled, so that the bond is hardened and fixed. The melt yarn may be arranged in the upper and/or the sole.
In some embodiments, the melt yarn is weft-knitted into the knitwear. In case of several layers, the melt yarn may be weft-knitted into one, several or all layers of the knitwear.
In certain embodiments, the melt yarn may be arranged between two layers of knitwear. In doing so, the melt yarn may simply be placed between the layers. Arrangement between the layers has the advantage that the mold is not stained during pressing and molding, since there is no direct contact between the melt yarn and the mold.
A further possibility for reinforcing knitwear that is used for the present invention, for example in an upper and/or a sole, is the use of a thermoplastic textile. This is a thermoplastic woven fabric or thermoplastic knitwear. A thermoplastic textile melts at least partially when subjected to heat and stiffens as it cools down. A thermoplastic textile may, for example, be applied to the surface of an upper or a sole, which may comprise knitwear, for example, by applying pressure and heat. When it cools down, the thermoplastic textile stiffens and specifically reinforces the upper or the sole in the area in which it was placed, for example.
The thermoplastic textile may be specifically manufactured for the reinforcement in its shape, thickness and structure. Additionally, its properties may be varied in certain areas. The stitch structure, the knitting stitch, and/or the yarn used may be varied such that different properties are achieved in different areas.
According to certain embodiments, a thermoplastic textile is a weft-knitted fabric or warp-knitted fabric made from thermoplastic yarn. Additionally, the thermoplastic textile may also comprise a non-thermoplastic yarn. The thermoplastic textile may be applied to an upper or a sole of a shoe, for example, by pressure and heat.
A woven fabric whose wefts and/or warps are thermoplastic are other embodiments of a thermoplastic textile. Different yarns may be used in the weft direction and the warp direction of the thermoplastic woven fabric, so as to achieve different properties, such as stretchability, in the weft direction and the warp direction.
A spacer weft-knitted fabric or spacer warp-knitted fabric made from thermoplastic material are other embodiments of a thermoplastic textile. In this regard, e.g. only one layer may be thermoplastic, e.g. so as to be attached to an upper or a sole. Alternatively, both layers are thermoplastic, e.g. in order to connect the sole to the upper.
A thermoplastic weft-knitted fabric or warp-knitted fabric may be manufactured using the manufacturing techniques for knitwear described in the section “knitwear”.
A thermoplastic textile may be connected with the surface to be reinforced only partially subject to pressure and heat so that only certain areas or only a certain area of the thermoplastic textile connects to the surface. Other areas or another area do not connect, so that the permeability for air and/or humidity is maintained there, for example. The function and/or the design of e.g. an upper or a sole may be modified by this.
The upper 51 comprises a first partial area 91a, which is manufactured from knitwear made from a more elastic yarn. The first partial area 91a extends in the area of the forefoot in the flexing zone of the shoe and runs from the lateral side to the medial side via the upper side of the foot. The first partial area may generally also be arranged in other areas of the upper 51.
The shoe upper 51 comprises a second partial area 92a, which is manufactured as one-piece knitwear with a first partial area 91a. The first partial area 91a and the second partial area 92a may be manufactured in one piece on a weft-knitting machine or warp-knitting machine. The second partial area 92a runs substantially parallel to the first partial area 91a and directly neighbors this. Due to the substantially parallel course (the two partial areas are adjacent to one another), the contour of the second partial area 92a follows the contour of the first partial area 91a.
The first partial area 91a comprises a first yarn, while the second partial area 92a comprises a second yarn. The first yarn is more elastic than the second yarn. Elasticity, i.e. ductility, may be measured by a tensile strain being applied to the yarn and the resulting change in length being measured, for example. A yarn which stretches more, i.e. which undergoes a greater change in length than another yarn in case of defined tensile strain is more elastic than the latter. This measurement is usually carried out with sections of the same length of both yarns so as to keep changes in length comparable.
Elasticity, i.e. ductility of the yarn may be specified as Young's modulus, for example. Young's modulus is the quotient of the tensile strain and the resulting elongation, with the elongation specifying the ratio of the change in length to the original length. Young's modulus may be specified as Newton per square meter (N/m2), for example. Thus, a more elastic yarn has a lower Young's modulus than a less elastic yarn.
The first yarn may comprise elastane or rubber. These two materials comprise great ductility. The second yarn may be a plastic yarn, such as nylon or polyester, but also a fuse/melt yarn, for example, which comprise lower ductility compared to elastane or rubber.
It is conceivable that the first partial area 91a and the second partial area 92a are not directly adjacent to each other. In this case, knitwear may be located between the first partial area 91a and the second partial area 92a, that is neither allocated to the first partial area 91a nor to the second partial area 92a (e.g. because it comprises neither the first yarn nor the second yarn) and which may be manufactured as one-piece knitwear with the first partial area 91a and the second partial area 92a.
In certain embodiments, as shown in
The longitudinal axis 93 of the upper 51 is also shown in
In certain embodiments, as shown in
A further first partial area 91b is shown in
The second partial area 92b in the ankle region comprises four separate portions. Generally, the first partial area and the second partial area may comprise sections which may be connected or unconnected with each other, i.e. a partial area does not have to be a contiguous surface. A partial area may e.g. also be composed of two portions that are not adjacent to each other. If the portions are unconnected, the respective other partial area may be arranged between these portions, for example. In the embodiments shown in
Since the first partial area 91b is arranged in the ankle area in the embodiments of
The first partial area 91b may additionally be padded in the ankle area, for example with a foam material or a spacer weft-knitted fabric, in order to achieve a comfortable wearing sensation. The first partial area 91b may also be manufactured as a spacer weft-knitted fabric or spacer warp-knitted fabric in the ankle area. In this manner, subsequent padding is omitted.
The second partial area may generally also be manufactured as a spacer weft-knitted fabric or spacer warp-knitted fabric. For example, the first partial area could assume the function of padding in this manner.
An example, shown in
Due to the arrangement of the first partial area 91c with the more elastic yarn over the instep area, lacing may be done without, since the upper 51 comprises a certain ductility, which causes the upper 51 to adjust to the foot, in this area due to the second yarn. Simultaneously, however, the less elastic yarn in the second partial area 92c prevents the foot from shifting too much in case of movements with a high transmission of force from the foot to the ground (e.g. when suddenly slowing down when running). In other words, the first partial area 91c ensures a good fit of the upper 51 and a good fitting, while the second partial area 92c fixes the foot in case of great force transmissions and limits its maximum movement relative to the sole.
A first partial area 91d and a first partial area 91e, which are arranged in the heel area, are also shown in
The first partial areas 91a, 91b, 91c, 91d and 91e as well as the second partial areas 92a, 92c, 92d and 92e in
Generally, the first partial area, such as first partial areas 91a, 91b, 91c, 91d and 91e in
On principle, the mesh structure may also differ within the first partial area or the second partial area. The type of weft-knitting or warp-knitting may also differ within the first partial area or the second partial area.
As reinforcement, the knitwear of the upper according to certain embodiments of the invention may generally comprise a monofilament, as described in the sections “monofilaments for reinforcement” and “combination of monofilaments and polymer coating”. It is conceivable, for example, that the knitwear of the second partial area comprises a monofilament for reinforcement. The lower elasticity of the second partial area is then reinforced by the monofilament in addition to the lower ductility of the second yarn. The second partial area may also be reinforced as described in the sections “polymer coating”, “combination of monofilaments and polymer coating” and “thermoplastic textile for reinforcement”. This also applies with regard to the first partial area.
The knitwear of the upper according to certain embodiments of the invention may also comprise a melt yarn, as described in the sections “yarns” and “melting yarn”. It may be heated beyond its melting temperature, fuses and stiffens when the knitwear is cooled down, thus reinforcing the latter. A melt yarn may be used in addition to the second yarn of the second partial area. However, use in the first partial area is not excluded.
In order to obtain a second partial area which differs from the first partial area with regard to the used yarn, weft-knitting or warp-knitting techniques which are known as such may be used. For example, the first partial area or the second partial area or both partial areas may be knit in intarsia or Jacquard technique.
It is also possible for the upper to substantially fully surround the foot of a person wearing it. In this case, the first partial area or the second partial area or both partial areas may be at least partially arranged in the area of the sole.
The upper 51 may be attached to a sole in order to obtain a shoe. For this purpose, the upper 51 may be glued, welded or sewn to the sole, as described in the section “functional knitted fabrics”, for example. Alternatively, the sole may be manufactured in one piece with the upper, e.g. manufactured as one-piece knitwear on a weft-knitting or warp-knitting machine.
In certain embodiments, therefore, the first partial area with the first, more elastic yarn is arranged in the area of the zone 102 in
So as to provide the foot with the necessary stability in the area of zones 101 and 103 in
According to certain embodiments of the present invention, the second partial area, which comprises the second, less elastic yarn, may be arranged where no great expansion of the surface, i.e. the skin of the foot is to be expected, e.g. in the area of the ankle 111. In these zones, greater flexibility and stability may be achieved in this manner, in order to stabilize the foot and thus prevent or reduce chafing or sliding of the foot in the show.
So as to be able to simultaneously provide a wearer of the shoe with a most pleasant walking feeling, however, the first partial area with the more elastic first yarn should be arranged in the zones in which greater expansions of the foot are to be expected. This is the case in zones 112 in
In the following, further examples are described to facilitate the understanding of the invention:
Different arrangements of the components depicted in the drawings or described above, as well as components and steps not shown or described are possible. Similarly, some features and sub-combinations are useful and may be employed without reference to other features and sub-combinations. Embodiments of the invention have been described for illustrative and not restrictive purposes, and alternative embodiments will become apparent to readers of this patent. Accordingly, the present invention is not limited to the embodiments described above or depicted in the drawings, and various embodiments and modifications may be made without departing from the scope of the claims below.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102013207155.8 | Apr 2013 | DE | national |
This application is a continuation patent application of U.S. application Ser. No. 17/069,942, filed Oct. 14, 2020, entitled “KNITTED SHOE UPPER” (“the '942 application”), which is a continuation patent application of U.S. application Ser. No. 14/257,668, filed Apr. 21, 2014, entitled “KNITTED SHOE UPPER” (“the '668 application”), which is related to and claims priority benefits from German Patent Application No. DE 10 2013 207 155.8, filed on Apr. 19, 2013, entitled UPPER (“the '155 application”). The '942, '668 and the '155 applications are hereby incorporated herein in their entireties by this reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17069942 | Oct 2020 | US |
| Child | 18487737 | US | |
| Parent | 14257668 | Apr 2014 | US |
| Child | 17069942 | US |
