SOCKS AND OTHER FOOTWEAR WITH SELECTIVE FRICTION REDUCING FEATURES
A sock and/or outer footwear having one or more portions with reduced frictional characteristics. One or more of the heel portion, the arch portion and the ball portion of the sock and/or interior of the outer footwear is fabricated with one or more fibers having the reduced frictional characteristics. The reduced frictional characteristics are established with the one or more low-friction fibers that are integrated with fibers having additional complementary characteristics of thermal regulation and moisture management. The provision of reduced frictional characteristics in one or more of the heel, arch and ball facilitates insertion of a foot into footwear.
This application is a continuation-in-part, and claims the priority benefit of, pending U.S. nonprovisional patent application Ser. No. 13/856,980, filed Apr. 4, 2013, which is a nonprovisional, and claims the priority benefit, of U.S. provisional patent application Ser. No. 61/620,077 filed Apr. 4, 2012, of the same title and by the same inventor. The content of the prior applications is incorporated herein by reference.
BACKGROUND OF THE INVENTION 1. Field of the InventionThe present invention relates to footwear. More particularly, the present invention relates to inner footwear, such as socks and stockings, as well as outer footwear, such as, for example, dress shoes, casual shoes, athletic boots, protective boots, sneakers, orthopedic shoes and the like. Still more particularly, the present invention relates to footwear configured with maximum comfort and convenience of use, including selective friction reducing features to reduce the difficulty of inserting a foot into outer footwear such as a boot.
2. Description of the Prior ArtPeople wear outer footwear of different types for a wide range of reasons. Outer footwear includes shoes and boots generally, as well as recreational and athletic footwear. Outer footwear may also include medical products such as protective boots worn by individuals tending to a particular physical condition. Some outer footwear covers the foot, while other forms extend above the ankle and can also cover a substantial part of the leg, including at or above the knee. Some forms of outer footwear are easier to place on the foot than others. For example, it can be difficult to get a boot onto the foot because of resistance or friction that exists at certain locations of the foot-footwear interface.
There are three primary locations of the foot that cause frictional resistance to placement of outer footwear onto the foot. They are: 1) the heel; 2) the padded portion of the sole of the foot covering the metatarsals, commonly referred to as the ball of the foot; and 3) the bony curves of the top of the instep comprising the longitudinal and transverse arches, commonly referred to as the arch of the foot. Everyone has these foot features. Some are more pronounced than others and so placement of the foot into outer footwear may be more or less difficult for particular individuals. Nevertheless, dependent upon the characteristics of the outer footwear, most every person has some difficulty in getting his or her foot into certain types of outer footwear. It is particularly noticeable when the person wishes to wear a boot.
People wear outer footwear with and without a covering or interface between the foot and the outer footwear. The covering is a form of inner footwear commonly referred to as a sock or stocking. These coverings come in a wide array of forms from very thick to very thin and very high (on the leg) to very low (on the foot). The coverings may or may not reduce the frictional resistance between the interior of the outer footwear and the skin of the foot. In general, however, they tend to facilitate passage of the foot into the outer footwear. While they maybe suitable for that purpose, coverings are usually used for other primary purposes, such as keeping the foot warm or as a moisture absorbent. Foot coverings or inner footwear used as an interface between the foot and outer footwear will be referred to herein as socks or stockings, which is intended to identify all forms of such inner footwear coverings.
Apart from the almost limitless shapes, sizes and decorative forms of socks that exist for primarily aesthetic purposes, there are functional features that have been developed to address particular concerns. For example, particular materials and supplemental components are incorporated into socks to enhance warmth retention or facilitate moisture absorbance or wicking. Other features have been adopted to improve the feel or comfort of the sock. Another practical modification has been to add materials and surface features to the exterior sole of the sock to enhance frictional engagement of an underlying surface when the sock is not contained in outer footwear. That modification reduces the likelihood of a slip but such a sock is not useful in reducing the difficulty of getting a socked foot into the outer footwear. In fact, the frictional material on the ball of the foot makes that effort even more difficult. In addition, efforts to reduce slipping, as well as efforts to facilitate passage of a foot into footwear reduce or prevent other desired characteristics of the sock. For example but not limited thereto, the sock should remain comfortable to wear, minimize the possibility of blisters occurring on the foot and maintain desired thermal qualities, whether suitable ventilation or effective insulation. A sock that provides effective thermal regulation and moisture management properties that are contributing factors to comfort, minimizing blistering, and enhancing thermal retention while also facilitating passage of the sock into footwear is desired and has not seen in prior sock configurations.
Therefore, what is needed is a foot covering; that is, a sock, that is configured to facilitate rather than hinder placement of the foot into outer footwear. What is also needed is such a sock that has other features consistent with other desired features of a sock including, but not limited to, satisfactory comfort and appearance as well as such other functional features that may be of interest without compromising any of the desired features. In particular, the sock should be comfortable to wear, minimize the possibility of blisters occurring on the foot and maintain desired thermal qualities, whether suitable ventilation or effective insulation. The sock should provide effective thermal regulation and moisture management properties in that regard. Further, what is needed is such a sock that may be fabricated in a sufficiently cost efficient manner. Yet further, what is needed is outer footwear having one or more interior features that facilitate passage of the foot into the outer footwear. Such one or more interior features should be provided for use with, or in place of, a sock having similar characteristics.
SUMMARY OF THE INVENTIONIt is an object of the present invention to provide a foot covering; that is, a sock, that is configured to facilitate rather than hinder placement of the foot into outer footwear. It is also an object to provide such a sock that has other features consistent with other desired features of a sock including, but not limited to, satisfactory comfort and appearance as well as such other functional features that may be of interest. Further, it is an object of the invention to provide such a sock that may be fabricated in a sufficiently cost efficient manner. Yet further, it is an object of the invention to provide outer footwear having one or more interior features that facilitate passage of the foot into the outer footwear. Such one or more interior features can be used with, or in place of, a sock having similar characteristics.
These and other objects are achieved with the present invention, which includes a sock fabricated of one or more materials selected and configured to provide effective thermal regulation and moisture management that renders the sock comfortable, minimizes the possibility of blisters occurring on the foot and maintains desired thermal qualities, as well as having one or more friction reducing features at one or more of the three primary locations where the foot experiences resistance when being placed into outer footwear. The thermal regulation and moisture management characteristics are established using yarns formed of fibers that facilitate wicking and transfer moisture away from the skin to effect drying. The yarns and/or fibers used to make the yarns that are used to produce the socks are configured in a way that results in fiber entanglements that establish tortuous pathways as interstices that control movement of fluid through the sock structure and that further provide loft resulting in a thermally insulative arrangement. The friction reducing features are established in the sock through one or more of: a) a low-friction material applied to all or a portion of the exterior of a sock, e.g., a coating of low-friction material to the exterior surface of the sock; b) a low-friction material applied to fibers that are woven or knitted together to form all or a portion of a sock, e.g., a coating of low-friction material applied to the fibers that make up the sock rather than being applied on the surface of the sock itself; c) one or more low-friction fibers integrated with one or more materials used to make a conventional sock; d) forming a sock with a reduced thickness of material in one or more of the primary resistance locations; and e) placing a supplemental fixed or removable sling or bra of low-friction material onto the exterior of a sock, wherein the sling is configured for positioning on the sock at one or more of the three primary locations described above. One or more of these options may be selected to enable a reduction in the extent to which the interior of the outer footwear and the exterior of the sock engage one another at one or more of the primary resistance locations of the foot.
The low-friction material may be a viscoelastic material or a nonviscoelastic material having a low coefficient of friction. For example, the material may be silicone. Alternatively, the low-friction material may be a spray-on material adhered to the surface of the sock, such as a Teflon® spray material. The low-friction material applied to the sock may also be a metallic or a nonmetallic material selected for a coefficient of friction that is less than the remainder of the material used to make the sock. The low-friction material may be applied to the surface of the sock after the sock has been fabricated. Alternatively, the low-friction material may be applied to the fibers or yarn used to form a sock. The sock is then fabricated in a conventional manner using the treated fibers or yarn. These fibers may be used to make a complete sock or they may be integrated, that is, interspersed, with other fibers or weaves of the sock's standard material in one or more of the primary areas, such as cotton, or they may be used as replacements for the materials in those areas. In that embodiment, the low-friction fibers are joined with adjacent conventional fibers, such as by weaving, rather than by interspersing the different materials together
The one or more low-friction fibers may be any manmade or natural fibers having a coefficient of friction less than the coefficient of friction of the remainder of the material used to make the sock. The low-friction fibers may be selected from, but are not limited to, silicone, nylon, polyethylene and polypropylene fibers. Other viscoelastic and nonviscoelastic materials may be selected for that purpose. The fibers may be integrated, that is, interspersed, with the other fibers or weaves of the sock's standard material in one or more of the primary area, such as cotton, or they may be used as replacements for the materials in those areas. In that embodiment, the low-friction fibers are joined with adjacent conventional fibers, such as by weaving, rather than by interspersing the different materials together. The fibers used to make the socks may include hollow fibers that facilitate the transport of fluid through the sock as a wicking element. At least a portion of the fibers used to make the sock include wicking, liquid transport, drying and/or other characteristics, which at least a portion of the fibers may be combined with friction-reducing fibers, such as silicone fibers, as well as optional anti-microbial elements, such as Gold and Silver combinations bound together, all of which, when combined together, produce a sock that is easy to insert into and remove from footwear such as a boot without compromising other desired sock characteristics such as thermal regulation and moisture management.
The option of reducing the thickness of the material of the sock in one or more of the primary resistance locations as the friction reducing solution includes establishing a transition of conventional material at a given thickness to one or more regions of material of lesser thickness, wherein the material for the region of lesser thickness may be formed of the same or a different material as that of the conventional material. The one or more regions correspond to the primary locations of greater resistance previously noted. For example, but not limited thereto, the thickness of the conventional material may be about 1/16-inch while the region of reduced thickness may be about 1/32-inch. The differential of thickness is not limited thereto and may be selected dependent upon the frictional characteristics of the conventional material and the material for the thinner region. There may also be a transition of the thickness change that is gradual rather than stepped, but a stepped change of thickness is an option.
The friction reducing features of the sock of the present invention may be established in one or more of the indicated primary locations of resistance. Each location may have the friction reducing features. Only one location may have the feature. Any combination of two locations may have the features. Those locations including the features may all have the same features or each or groups of locations may have the same or different features. For example, but not to be limiting, the heel of the foot area of the sock may include the friction reducing fibers incorporated with the conventional material of the sock while the ball of the foot area of the sock may have the reduced material thickness feature. Other combinations may also be adopted for the sock.
The present invention also includes outer footwear having one or more interior friction reducing features established in areas corresponding to the primary locations of resistance. The friction reducing features may be established in the interior areas of the outer footwear in the manner described with respect to the sock of the present invention. That is, interior areas where friction reduction is desired may be modified using one or more of: a) a low-friction material applied to all or a portion of the interior, e.g., a coating of low-friction material to the interior surface of the outer footwear; b) a low-friction material applied to fibers that are woven or knitted together to form all or a portion of the interior of the outer footwear, e.g., a coating of low-friction material applied to the fibers that make up all or a portion of the interior of the outer footwear rather than being applied on the surface of the interior itself c) one or more low-friction fibers integrated with one or more materials used to make a conventional outer footwear interior; and d) forming the interior of the outer footwear with a reduced thickness of material in one or more areas associated with the primary resistance locations. The various options noted may be incorporated into the interior of the outer footwear in the manner described with respect to the implementation of the friction reducing features for the sock of the present invention.
For the interior of the outer footwear modification options noted, each of these options may be selected to enable a reduction in the extent to which the interior of the outer footwear and the exterior of the foot or a sock engage one another at one or more of the primary resistance locations of the foot. Each of the interior areas may have the friction reducing features. Only one of the interior areas may have the feature. Any combination of two interior areas may have the features. Those interior areas including the features may all have the same features or each or groups of locations may have the same or different features. For example, but not to be limiting, the heel of the foot area of the interior of the outer footwear may include the friction reducing fibers incorporated with the convention material of the heel of the outer footwear while the interior sole associated with the location of the ball of the foot may have the reduced material thickness feature. Other combinations may also be adopted for the outer footwear so modified.
The present invention also includes a tool configured to facilitate passage of the foot into outer footwear. Unlike a conventional shoehorn, which is rigid, the tool of the present invention is formed of a flexible material having relatively low frictional characteristics and sufficient structural integrity to withstand the loading experienced at the interface of a foot moving into outer footwear. The tool is formed with dimensions sufficient to permit its placement into the interior of the outer footwear without blocking movement of the foot. The tool may have a width about the same as the width of the interior of the heel of the outer footwear, or it may be narrower or wider. If narrower, it should remain wide enough to cover about one-half of the width of the heel. If wider, it should be narrow enough that it does not curl on itself and act as an impediment to foot passage into the outer footwear. The tool may be made of a tough, flexible and low-friction material, such as Mylar®, supplied by DuPont, but not limited thereto. The tool includes a primary body structure formed of a material sufficiently difficult to tear when used between the foot, whether or not covered by a sock, and the interior of the footwear and with frictional resistance lower than frictional characteristics of either or both of a foot/sock and the interior of the footwear.
The sock, sling and/or outer footwear of the present invention with one or more selective friction reducing features, as well as the optional tool, enable a person to get his or her foot into footwear more easily than is possible with existing foot coverings. This is helpful to children who may have difficulty getting their snow boots on, the elder who may have difficulty getting a shoe on, and the active who wish to put a ski boot on. This and other advantages of the present invention will be more fully understood upon review of the following detailed description, the accompanying drawings, and the appended claims.
A sock 10 of the present invention is shown in
The sock 10 of the present invention includes modifications to one or more of the heel portion 14, the arch portion 24 and the ball portion 26. In particular, one or more of those portions of the sock 10 include a friction reducing feature or configuration that facilitates the passage of a foot covered by the sock 10 into footwear. It is to be understood that the sock 10 shown in
The sock 10 is fabricated using one or more yarns made of fibers that enhance thermal regulation and moisture management through wicking, drying, thermal insulation and, optionally, anti-microbial characteristics, in addition to its fabrication to reduce friction at least at one or more of the heel portion 14, the arch portion 24 and the ball portion 26. The fibers that aid in thermal regulation and moisture management include manmade and natural fibers, such as polyester, nylon, polypropylene, cotton, wool, alpaca and blends thereof. Specifically, the sock 10 is made with fibers that facilitate wicking, such as hydrophobic fibers, hollow fibers or a combination of the two, particularly at the inner surface of the sock 10 where it contacts the skin. The fibers that facilitate wicking are made of polyethylene, polypropylene, or a combination thereof. The fibers may also be blends and may include natural fibers including, but not limited to, cotton. The fibers may be shaped, textured, or configured with substantial non-round perimeter features, such as a Y-shaped or an X-shaped fiber, for example. Anti-microbial elements, such as reconstruction of Gold and Silver particles that are bound together can be applied to the fibers and, due to the attraction properties of Gold through mechanical and molecular bonding to the fibers, aid in moisture management that minimize contamination of the sock 10. That bonding of the anti-microbial elements to the sock fibers remains in place through a plurality of iterations of washing and drying of the sock 10. The sock 10 also includes fibers that facilitate drying after passage from the inner surface to an interior of the sock, such as hydrophilic fibers, for example. Hollow fibers can be used to transport moisture through the sock 10. Further, the fibers of the sock 10 are either formed or mechanically manipulated to establish interstices between adjacent ones. The yarns made of the fibers can also be mechanically manipulated, such as by weaving, peaching, needling, to establish entanglements of fibers thereof to create interstices as tortuous pathways that regulate progression of moisture through the sock 10 and thereby enhance comfort and minimize liquid contact with the skin of the wearer. These features of the sock 10 are combined with the friction reducing features as described herein in an integrated fashion so that the fibers for all qualities described are interspersed with one another to provide smooth transitions between regions of the sock 10 and ensure that desired characteristics are maintained, including after cleaning of the sock 10. Prior sock configurations that have applied friction-reducing elements attached to the sock primarily, as well as treatments to the sock, such as chemical sprays, wear off after periodic washing and drying. The sock 10 of the present invention maintains desired qualities through many cycles of washing and drying because the desired characteristics are in the fibers themselves as well as the established pathways within sock 10.
At least one of the heel portion 14, the arch portion 24 and the ball portion 26 is specifically fabricated with one or more low-friction fibers forming all or a portion of those regions of the sock 10. The one or more low-friction fibers may be any manmade or natural fibers having a coefficient of friction less than the coefficient of friction of the remainder of the material used to make the sock 10. The low-friction fibers may be selected from, but are not limited to, silicone, nylon, polyethylene and polypropylene fibers. The low-friction fibers form a low-friction yarn, or at least a portion of a yarn that includes such fibers. As stated above, the low-friction fibers/yarns are integrated, that is, interspersed, with the other fibers or yarns of the material(s) described herein used to establish characteristics of the sock 10 that include the thermal regulation and moisture management associated with wicking, drying and thermal integrity, as well as optional anti-microbial functionality. The different areas may be stitched together or woven together so that they are joined together in a way that minimizes the possibility of separation. Mechanical manipulation of the sock 10 components integrated together before forming the sock shape, such as by needling or peaching, is used to establish tortuous pathways within the sock 10 that enhance one or more of the characteristics described.
In an embodiment of the sock 10, at least one of the heel portion 14, the arch portion 24 and the ball portion 26 is fabricated to have a material thickness that is less than the thickness of the material of the sock 10 in the remaining portions of the sock 10. The reduced thickness feature may be accomplished by transitioning from the conventional material of the remainder of the sock 10 in a gradual manner to a selectable reduced thickness at one or more of the heel portion 14, the arch portion 24 and the ball portion 26. The material of the reduced thickness portions may be formed of the same or a different material as that of the conventional material. In one example of this embodiment of the sock 10, the leg portion 12, the instep portion 16, the foot portion 18, the toe portion 20 and the sole portion 22 may be fabricated with a thickness of about 1/16-inch while one or more of the heel portion 14, the arch portion 24 and the ball portion 26 may be fabricated with a thickness of about 1/32-inch. The differential of thickness is not limited thereto and may be selected dependent upon the frictional characteristics of the conventional material and the material used to make one or more of the heel portion 14, the arch portion 24 and the ball portion 26. As indicated, the transition of the thickness change may be gradual, but it may alternatively be stepped.
The present invention may also combine the sock 10 or a conventional sock with a separate component that may be applied to a convention sock to reduce the frictional characteristics of the conventional sock. A sling 50 of the present invention suitable for that purpose is shown in
An outer footwear 100 of the present invention is shown in
The footwear 100 of the present invention includes modifications to one or more of the interior heel 106, the top arch portion 120 and the ball portion 122. In particular, one or more of those portions of the footwear 100 include a friction reducing feature or configuration that facilitates the passage of a foot into the footwear 100. It is to be understood that the footwear 100 shown in
In a first embodiment of the footwear 100, at least one of the interior heel 106, the top arch portion 120 and the ball portion 122 is fabricated with a low-friction material applied to a portion or substantially all of the surface of such one or more portions. The low-friction material may be a viscoelastic material or a non-viscoelastic material having a low coefficient of friction. For example, the material may be silicone. Alternatively, the low-friction material may be a spray-on material adhered to the interior surface of the footwear 100 at one or more of the interior heel 106, the top arch portion 120 and the ball portion 122. The spray-on material may be a Teflon® spray material but not limited thereto. The low-friction material may also come in a tape form that may be attached to the interior of the footwear 100 at one or more desired locations. The low-friction material applied to the interior of the footwear 100 at one or more of the indicated portions may also be a metallic or a nonmetallic material selected for a coefficient of friction that is less than the remainder of the material used to make the interior of the footwear 100.
In a second embodiment of the footwear 100, at least one of the interior heel 106, the top arch portion 120 and the ball portion 122 is fabricated with one or more fibers coated with a low-friction material applied to a portion or substantially all of the outer surface of such fibers. The low-friction material may be a viscoelastic material or a non-viscoelastic material having a low coefficient of friction. For example, the material may be silicone. The fibers that are coated may be any manmade or natural fibers. The fibers may be selected from, but are not limited to, cotton and wool. The fibers may also be silicone fibers. The coated fibers may be integrated, that is, interspersed, with the other materials used to make the interior of the footwear 100 in the areas where the low-friction coated fibers are located.
In a third embodiment of the footwear 100, at least one of the interior heel 106, the top arch portion 120 and the ball portion 122 is fabricated with one or more low-friction fibers. The one or more low-friction fibers may be any manmade or natural fibers having a coefficient of friction less than the coefficient of friction of the remainder of the material used to make the interior of the footwear 100. The low-friction fibers may be selected from, but are not limited to, silicone, nylon, polyethylene and polypropylene fibers. Other viscoelastic and non-viscoelastic materials may be selected for that purpose. The fibers may; be integrated, that is, interspersed, with the materials used to make the remainder of the interior of the footwear 100.
In a fourth embodiment of the footwear 100, at least one of the interior heel 106, the top arch portion 120 and the ball portion 122 is fabricated to have a material thickness that is less than the thickness of the material of the adjacent portions of the interior of the footwear 100. The reduced thickness feature may be accomplished by transitioning from the material of the remainder of the interior of the footwear 100 in a gradual manner to a selectable reduced thickness at one or more of the interior heel 106, the top arch portion 120 and the ball portion 122. The material of the reduced thickness portions may be formed of the same or a different material as that of the conventional material. In one example of this embodiment of the footwear 100, the insole 110, the interior instep portion and the interior toe portion 118 may be fabricated with a thickness of about 1/16-inch while one or more of the interior heel 106, the top arch portion 120 and the ball portion 120 may be fabricated with a thickness of about 1/32-inch. The differential of thickness is not limited thereto and may be selected dependent upon the frictional characteristics of the conventional material and the material used to make one or more of the interior heel 106, the top arch portion 120 and the ball portion 122. As indicated, the transition of the thickness change may be gradual, but it may alternatively be stepped.
It is to be noted that the sock 10 and the footwear 100 may be used separately or in combination. Further, the sling 50 may be used with either or both of the sock 10 and the footwear 100.
The present invention has been described with respect to various example embodiments. Nevertheless, it is to be understood that various modifications may be made without departing from the spirit and scope of the invention. All equivalents are deemed to fall within the scope of this description of the invention.
Claims
1. A sock comprising:
- a leg portion,
- a heel portion,
- an instep portion,
- a foot portion including a top arch portion,
- a toe portion, and
- a sole portion including a ball portion,
- wherein the leg portion, the heel portion, the instep portion, the foot portion, the toe portion and the sole portion are fabricated of one or more fibers having thermal regulation and moisture management characteristics, wherein the heel portion, the top arch portion and the ball portion further include fibers having reduced-friction characteristics, wherein the fibers having reduced-friction characteristics are integrated with the one or more fibers having thermal regulation and moisture management characteristics and arranged to establish interstices throughout the sock.
2. The sock of claim 1 wherein the fibers having reduced friction characteristics are low friction fibers.
3. The sock of claim 2 wherein the low-friction fibers are silicone fibers.
4. The sock of claim 3 wherein the one or more fibers having thermal regulation and moisture management characteristics are fibers made of materials selected from manmade fibers, natural fibers and blends thereof.
5. The sock of claim 4 wherein the fibers having thermal regulation and moisture management characteristics are made of materials selected from: nylon, polyester, polypropylene, cotton, wool, alpaca and blends thereof.
6. The sock of claim 3 wherein the one or more fibers having thermal regulation and moisture management characteristics include hollow fibers.
7. The sock of claim 1 further comprising anti-microbial reconstruction of elements of Gold and Silver.
8. The sock of claim 6 wherein the anti-microbial reconstruction of elements of Gold and Silver comprises bonded of Gold and Silver elements.
Type: Application
Filed: Mar 22, 2017
Publication Date: Oct 19, 2017
Inventor: Lee L. Thibodeau (Cumberland, ME)
Application Number: 15/466,622
