TECHNICAL FIELD
The present application generally relates to shoes such as cycling shoes, and to a construction of an upper thereof.
BACKGROUND OF THE ART
Cycling shoes are used with automatic pedals as a combination designed to maximize the transfer of pedaling power to the transmission of the bicycle, such as the chainset in standard bicycles. Accordingly, cycling shoes typically have rigid soles, i.e. plastomeric soles (e.g. hard plastics, metal, carbon), especially in the case of cycling shoes for road bikes or racing bikes, and are clamped by way of a cleat to the automatic pedal. Moreover, the upper is conventionally made of robust structural paneling materials to be secured firmly to the foot of the user.
However, it is known that feet are anatomically different from one person to another. Therefore, larger feet may not be adapted to some narrower types of shoes, and vice versa. This may force manufacturers to design wider and narrower shoes. There results stocks of shoes of different widths for a same size, and all inventory and cost issues related to such stocks, throughout the supply chain. It would be desirable to address this issue.
Another occurrence is that of cyclists using shoes that are too narrow. As the feet may have a tendency to flatten over the duration of a ride, cycling shoes may become uncomfortable during a ride, if not already tight when put on. In particular, the metatarsal region of the foot may fee particularly tight and uncomfortable, for example at a lateral location, or at a medial location—especially in the presence of a bunion.
SUMMARY
It is therefore an aim of the present disclosure to provide a cycling shoe that addresses issues related to the prior art.
Therefore, in accordance with the present disclosure, there is provided a cycling shoe comprising: a sole defining an undersurface of the cycling shoe, the sole having connection holes configured for connection of a pedal cleat to the sole; and an upper connected to the sole and defining with the sole a foot-receiving cavity, at least one expansion zone located in a lateral subportion of a metatarsal portion and/or toe portion of the cycling shoe and configured to be opposite a portion of at least a fifth metatarsal of a wearer of the cycling shoe, and/or located in a medial subportion of a metatarsal portion and/or toe portion of the cycling shoe and configured to be opposite a portion of at least a first metatarsal of a wearer of the cycling shoe, the at least one expansion zone being entirely surrounded by a window of structural upper paneling and/or sole and defined by at least one panel having a greater stretching characteristics than the structural upper paneling of the window.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a cycling shoe with lateral metatarsal expansion zone in accordance with the present disclosure;
FIG. 2 is a perspective fragmented view of another embodiment of the cycling shoe with lateral metatarsal expansion zone;
FIG. 3 is a perspective fragmented view of the cycling shoe of FIG. 2, with an exterior layer of structural upper paneling removed;
FIG. 4 is a perspective fragmented view of another embodiment of the cycling shoe with lateral metatarsal expansion zone;
FIG. 5 is an underside view of the cycling shoe of FIG. 1;
FIG. 6A is a sectional view of an exemplary construction of the expansion zone of FIG. 1 relative to structural upper paneling; and
FIG. 6B is a sectional view of another exemplary construction of the expansion zone of FIG. 1 relative to structural upper paneling.
DETAILED DESCRIPTION
Referring to the drawings and, more particularly, to FIG. 1, a cycling shoe in accordance with the present disclosure is generally shown at 10. The cycling shoe 10 is of the type that may be used with automatic pedals of a bicycle, and therefore has a sole 11 with connection holes 11A (FIG. 5), for fixing a cleat to the underside of the sole 11. The cycling shoe 10 may also be used with a pedal and toe clip assembly as well, and may not have connection holes 11A. The connection holes 11A are shown as being in a triangular pattern, for cleats such as Look®, Keo®, Shimano®, etc. However, the connection holes 11A may have different shapes and configurations, for other types of cleats, such as SPD®. The sole 11 in the attached figures is of the type found in road cycling shoes, with a smooth continuous surface, in contrast to grooves and legs found in mountain bike shoes or touring shoes. However, the cycling shoe 10 may also be a mountain bike shoe or a touring shoe, with a sole made for rugged terrain. In the case of a road cycling shoe, the sole 11 is rigid (i.e., substantially more rigid than elastic, with resistance to elastic deformation), in contrast to soles found in a mountain bike shoe or a touring shoe. For instance, the sole 11 in a road cycling shoe may be made of materials with plastomeric properties, such as carbon, composites, rigid plastics, in contrast to rubber or elastomers used for mountain bike shoes or touring shoes.
An upper 12 is connected to and projects upwardly from the sole 11, and forms therewith a foot-receiving cavity 13. The upper 12 generally consists of structural paneling as described hereinafter. The upper 12 may be generally separated in three areas, namely a toe portion 12A, a metatarsal portion 12B and a heel portion 12C. Without being limited to a rigid boundary, and as loosely shown in the Figs., the toe portion 12A generally covers the toes of the cyclist, whereas the metatarsal portion 12B covers the mid-portion of the foot, including the region encompassing the metatarsal bones of the wearer's foot, while the heel portion 12C protects and surrounds the heel of the wearer. The heel portion 12C may include part or all of the hindfoot, and may include the midfoot or a part thereof, and the instep. The metatarsal portion 12B, may be a rear part of the forefoot, may be separated in an outer (or lateral) sub-portion and an inner (or medial) sub-portion. The outer sub-portion generally goes from the second metatarsal bone to the side of the fifth metatarsal bone and is thus laterally positioned, whereas the inner sub-portion goes from the second metatarsal bone to the first metatarsal bone and is medially positioned. The medial sub-portion may include a bunion. The metatarsal portion 12B may include part or all of the ball of the foot. As a general observation, the vamp may include the toe portion 12A and the metatarsal portion 12B, while the quarter may include the heel portion 12C. Other constructions are contemplated as well.
The cycling shoe 10 may also include a throat 14 in the upper 12, with a tongue 15 in the throat 14, and a closure system 16. These components may or may not be present, as some cycling shoes may have a clog configuration. In the case of the closure system, a Boa® type closure system is shown, but other systems could be used as well, such as multiple Boa® type closure systems, Velcro® and ratchet straps, shoe laces, buckle and clip, for example.
Referring to FIG. 1, an expansion zone 20 is shown in the upper 12. More particularly, the expansion zone 20 may be mostly or entirely located in the metatarsal portion 12B of the upper 12, but may be also partially in the toe portion 12A of the upper 12, as in FIG. 1. The expansion zone 20 is located so as to be opposite the fifth metatarsal of the wearer's foot, and may also be opposite the fifth proximal phalanx of the wearer's foot. Another such expansion zone 20 may be located so as to be opposite the first metatarsal of the wearer's foot, and may also be opposite the first proximal phalanx of the wearer's foot. Such a medial expansion zone 20 may be opposite a bunion region. The shoe 10 may comprise a single expansion zone 20, whether medial or lateral, or two expansion zones 20, i.e. medially and laterally. In the illustrated embodiment, the expansion zone 20 is entirely surrounded by a window of structural paneling of the upper 12, delimited by window periphery 21. The expansion zone 20 is made of one or more panels 22 having a greater elasticity than the structural upper paneling of the window in a stretching direction, the structural upper paneling being semi-rigid, with limited planar stretch capacity. The limited planar stretch capacity may be defined as the capacity of a material to expand/stretch in its plane (e.g., if it is laid flat). The structural upper paneling has the capacity to deform so as to conform to the shape of a foot, but has limited or no planar stretch capacity. In an embodiment, the planar stretch capacity of the material of the expansion zone 20 is at least 10% greater than the planar stretch capacity of the surrounding structural paneling of the upper 12. Therefore, the expansion zone 20 may stretch or expand, relative to the surrounding structural upper paneling of the upper 12. In another embodiment, a bottom of the expansion zone 20 is delimited by the sole 11.
In FIG. 1, the panel 22 is made of a material with elasticity characteristics (i.e., as defined, it can stretch). For example, the panel 22 may be made a multilayer membrane. According to an embodiment, the panel 22 is made with a rubbery elastomeric polymer, such as silicone, and/or polyurethane. The silicone layer may at least form the exposed surface of the panel 22. Silicone is known for its stretching capacity and for its abrasion resistance. The panel 22 may also be made from natural rubber, with other polymeric elastomers, synthetic rubbers, etc. Alternatively, the panel 22 may be a textile, such as elastane (i.e., Spandex®), namely a polyester-polyurethane copolymer. According to another embodiment, the panel 22 may comprises an exposed layer of silicone, and an inner layer of a stretchable textile—inner layer meaning interior of the silicone, for instance exposed in the cavity 13 of the cycling shoe. The layers may be laminated or connected to one another in any appropriate way, e.g., sewn. The exposed layer of elastomer therefore provides wear resistance and elasticity, and some form of water repellence (although aeration holes may be present as shown), while the inner layer of textile provides some structure to the panel 22, for example if the panel 22 is to be stitched or sewn to the surrounding structural upper paneling.
In contrast, the surrounding structural upper paneling may include various layers, such as an exterior layer of leather or synthetic leather 21A, a film 21B and a structural mesh 21C, as one of numerous embodiments. In an embodiment, the upper has no film 21B, or the film 21B is an adhesive layer used for laminating the layers 21A and 21C to one another. The layer 21A may for example be made of a polyurethane with microfibers. The resistance against stretching of the surrounding structural upper paneling is substantially greater than that of the expansion zone 20. Therefore, by being surrounded by structural upper paneling, the expansion zone 20 has no or limited power dissipating impact during pedaling, in spite of its stretchability.
As shown in FIG. 1, the panel 22 may have a perforated portion 22A, provided with aeration perforations, and an unperforated contour 22B, by which the panel 22 is attached to the surrounding structural upper paneling. For example, the contour 22B may be sandwiched between some of the layers 21A, 21B and/or 21C, and/or be laminated and/or stitched to the surrounding structural upper paneling. Hence, FIG. 2 shows the cutout in the layer 21C defining the window 21, with a periphery of the contour 22B being shown, as it would be overlaid onto the layer 21C, or positioned internally of the layer 21C. The other layers 21A and 21B may then be positioned atop the assembly of the layer 21C and of the panel 22. The contour 22B may be embroided/sewn to the layer 21C, or any other layer or combination or layers among 21A, 21B and 21C. In an embodiment, the thread used for the embroidery/stitching is a stretchable thread, such as Spandex®. According to an embodiment, the portion 22A is a pad, such as a stretchable polymeric pad, and the contour 22B is part of stretchable textile layer, such as Spandex®. The panel 22 may also be made of a monolithic piece as well. The panel 22 may have a variable thickness, to provide more localized stretchability. In an embodiment, the portion 22A has a surface ranging between 2.0 cm2 and 14.0 cm2, inclusively.
Referring to FIG. 3, the panel 22 may also consist of the same material as the layer 21A, or materials with similar structural rigidity, but with folds or undulations 23, to allow expansion of the panel 22 relative to the surrounding structural upper paneling. Referring to FIG. 4, the zone is defined by a plurality of perforations 24 in the layer 21A and 21C, the perforations giving some stretching elasticity to the expansion zone 20 (i.e., in a plane of the expansion zone 20). Alternatively, the layer 21B and 21C, if present, may have a window 21 free of material so as not to add rigidity to the expansion zone 20, as in FIG. 2.
FIGS. 6A and 6B show possible constructions of the shoe 10, at the expansion zone 20. The panel 22 is shown as having a stippled line separating the panel 22 in a layer 22A and a layer 22B, based on the description provided above. However, as clearly described above, the panel 22 may be made of a single material or layer. The contour 22B may be sandwiched between layers 21A and 21C of the upper structural paneling, or may be connected to an inside surface of the layer 21C. Lamination, gluing, stitching 30, are possible manners used to secure the expansion zone 20 to the upper structural paneling. For example, even though the stitching 30 is shown in FIG. 6B, it may also be part of FIG. 6A.
While the present disclosure details the use of the expansion zone in a cycling shoe 10, it is considered to provide such expansion zones in other types of shoes as well. According to an embodiment, the exposed surface of the panel 22 is flush with the material of the window 21 surrounding it, to form a continuous surface without any raised edge. It is also contemplated to provide the expansion zone 20 in other types of items of footwear, such as running shoes, boots, etc, for any other activity.
Patent Application
20230039820
