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WO2025183985A1 - Semelle intérieure à décharge électrostatique - Google Patents

Semelle intérieure à décharge électrostatique

Info

Publication number
WO2025183985A1
WO2025183985A1 PCT/US2025/016732 US2025016732W WO2025183985A1 WO 2025183985 A1 WO2025183985 A1 WO 2025183985A1 US 2025016732 W US2025016732 W US 2025016732W WO 2025183985 A1 WO2025183985 A1 WO 2025183985A1
Authority
WO
WIPO (PCT)
Prior art keywords
insole
foot
foam layer
footwear
electrostatic discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/US2025/016732
Other languages
English (en)
Inventor
Mike ZHUANG
Daniel WAKELAND
Matthew Gooch
Ryan Anderson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Superfeet Worldwide LLC
Original Assignee
Superfeet Worldwide LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US18/647,793 external-priority patent/US20250268334A1/en
Application filed by Superfeet Worldwide LLC filed Critical Superfeet Worldwide LLC
Publication of WO2025183985A1 publication Critical patent/WO2025183985A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/36—Footwear with health or hygienic arrangements with earthing or grounding means
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
    • A43B17/003—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined characterised by the material
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
    • A43B17/003—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined characterised by the material
    • A43B17/006—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined characterised by the material multilayered
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
    • A43B17/08—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined ventilated
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
    • A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
    • A43B7/141—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form having an anatomical or curved form

Definitions

  • This application relates to footwear insoles and, more specifically, to insoles having electrostatic discharge properties.
  • the present invention pertains to the field of footwear that provides low resistance to electrostatic discharge, such as might be needed in some work environments. More specifically it is related to the design of insoles capable of electrostatic discharge. Electrostatic discharge footwear requires an insole or sock liner capable of transmiting a buildup of static electricity to the ground. This necessitates a path through the insole to a last board, midsole, and outsole that are also capable of electrostatic discharge.
  • a major challenge in this field is the construction of an insole that provides an efficient electrostatic discharge pathway while maintaining comfort for the wearer.
  • Previous attempts have primarily focused on stitching conductive threads through the insole. These threads must extend through all layers of the insole, including the foam layer and the top cover. However, this approach creates small ridges and recesses that interface with the foot, leading to discomfort as the wearer presses full weight onto the insole top surface.
  • the stitching typically provides discharge only to the 30 mega ohms level of resistance. To lower this level of resistance, increased stitching through the insole is required. This in turn exacerbates the issue of discomfort.
  • Other designs have embedded conductive material in a foam cushion layer of an insole, but this necessitates holes in the fabric cover layer on top to allow the passage of static electricity to the foam. These holes must be large to create the required lower resistance, further compromising the comfort of the insole.
  • Prior art US-20230413942-A1 proposes an electrically dissipative removable insole with a lower layer made of an electrically dissipative material and an upper layer made of natural or synthetic fibers.
  • the upper layer has openings that expose the material and allow direct contact with the sole of the wearer's foot.
  • this prior art introduces discontinuities in the top cover of the insole. It also does not address the need for a heel cup and arch support. Nor does it address the issue of volume reduction in the toe region.
  • Prior Art US-8914996-B2 proposes an antistatic insole with a cover layer, two layers of body, one arch pad, and one heel pad.
  • the first layer is made of rubber and conductive ethylene-vinyl acetate (EV copolymer) to form a trapezoidal shape from the forefoot area to the heel area. While this design includes an arch pad and heel pad but it overcomplicates the assembly into multiple parts that are not integrated together. Thus, the static dissipation is reduced and the cost is increased. It also does not address the volume issues that are sometimes inherent in work footwear.
  • EV copolymer conductive ethylene-vinyl acetate
  • EP-3744206-B1 proposes a multilayer (antistatic and/or conductive) insole composed of two layers of fabric, one of which is non-conductive and the other is positioned below it.
  • An electrically conductive resin is applied to the first layer and passes through the first layer to allow the passage of electric charges.
  • the resin reduces the breathability of the top cover layer.
  • the design also does not have the contour to follow the shape of the wearer's foot. It also may take up too much volume in particular footwear.
  • the ideal insole would provide an efficient electrostatic discharge pathway without the need for conductive threads stitched through the insole or large holes in the fabric cover layer. It would also provide a heel cup and arch support, and it would not take up too much volume in the toe region of the footwear.
  • the primary objective of the present invention is to provide an insole for electrostatic discharge footwear that offers a comfortable orthotic with low resistance to electrostatic discharge.
  • Another objective of the present invention is to incorporate conductive threads woven integrally into the fabric cover of the insole, providing substantial electrical flow paths from the foot of the wearer to the foam layer.
  • Yet another objective of the present invention is to construct the foam layer of the insole with an electrostatic discharge (ESD) chemical additive, creating polarity channels for an electrical pathway within the foam layer.
  • ESD electrostatic discharge
  • Still another objective of the present invention is to design the insole in a 3D supportive shape for the foot, enhancing comfort and increasing foot interface, thereby- improving the ESD capability of the insole.
  • a further obj ective of the present invention is to mold the bottom of the base of the insole in a way that it better accommodates various footwear, particularly work footwear, without taking up much volume.
  • the insole includes a base foam layer and a fabric top cover with conductive threads woven into the cover material. This configuration overlays the base foam layer and provides electrical flow paths from a foot of a wearer to the base foam layer.
  • the fabric top cover can be constructed of a breathable knit material, a woven material, or a non-woven material.
  • the base foam layer can be constructed of various materials, with polyurethane closed-cell foam being favored.
  • an electrostatic discharge chemical additive is added to the base foam layer. This additive can be added to a liquid polyurethane material before it is molded, foamed, and cured. Alternatively, conductive particles such as carbon powder may be used. The quantity of the additive can be adjusted to reach desired levels of low-resistance discharge.
  • the insole is formed into a 3D supportive shape for a foot for increased comfort and foot interface.
  • This 3D supportive shape may include a heel cup and an arch support.
  • the edges adjacent the toe region of the insole are beveled to accommodate various footwear.
  • the thickness of the region of the insole beneath the toes of the foot can also be reduced to accommodate various footwear.
  • the bottom surface of the base foam layer includes molded-in structures that provide relatively more or less cushioning to the foot in various regions of the foot.
  • These molded-in structures can comprise ridges and recesses, posts and ribs.
  • the present invention also provides a method for creating an insole for an electrostatic discharge footwear.
  • the method includes providing a base foam layer, providing a fabric top cover having conductive threads woven into the cover material, overlaying the fabric top cover on the base foam layer to provide electrical flow paths from a foot of a wearer to the base foam layer, and adding an electrostatic discharge chemical additive to the base foam layer to create polarity channels for an electrical pathway within the foam layer.
  • a support member is provided to nest below the foam cushion layer.
  • the support member is a preferably a rigid or semi-rigid member that surrounds at least a portion of the botom of heel cup.
  • the support member may also underly at least a portion of the arch support.
  • the invention also includes footwear that incorporates the ESD insole and integrates therewith.
  • the invention offers several advantages including enhanced comfort, improved interface with the foot, and efficient electrostatic discharge.
  • the insole can be formed into a 3D supportive shape for the foot, increasing comfort and foot interface.
  • the beveled edge of the toe region of the cushion layer of the base beter accommodates work footwear.
  • Fig. 1 illustrates a footwear insole with electrostatic discharge properties including a cushion member, and a fabric top cover.
  • FIG. 2 shows a cross-sectional view of the insole positioned within a shoe, emphasizing the interaction between the insole base and the shoe's midsole and/or outsole.
  • Fig. 3 depicts a cross-sectional side-elevational view of the insole, showcasing a top cover and a cushion base with formed recesses and ribs on the bottom for differential cushioning.
  • Fig. 4A presents a top view of the insole with an ESD fabric top cover and contoured heel and arch to fit the wearer's foot shape.
  • Fig. 4B illustrates the fabric top cover material, both the top face and the botom face.
  • Fig. 5 displays the botom view of an insole featuring a heel cup, arch support, beveled toe edges, and a base cushion structure with ribs and recesses.
  • Fig. 6A shows the botom view of an insole with a beveled toe edge and various structural features.
  • Fig. 6B shows a toe-end portion of the botom view of the insole.
  • Fig. 6C shows the toe-end portion in cross section.
  • Fig. 7 illustrates the interior of a shoe showing the last board with conductive stitching to create a conductive path from the insole to the midsole or outsole.
  • Fig. 8 illustrates an alternate embodiment having a further support structure nested with the foam cushion.
  • the present invention relates to an insole for an electrostatic discharge (i.e. , antistatic) footwear.
  • the insole comprises a base foam layer.
  • This layer can be made from a variety of materials, including but not limited to polyurethane, rubber, or silicone.
  • the foam layer serves as the primary structure of the insole, providing support and comfort to the wearer's foot.
  • the insole further comprises a fabric top cover.
  • This cover preferably includes conductive threads woven into (or otherwise integrated into) the cover material. These threads create an electrical flow path from the foot of the wearer to the base foam layer. This feature is particularly beneficial in environments where electrostatic discharge is a concern, such as in certain industrial or laboratory' settings.
  • the fabric top cover can be constructed of a breathable knit material. This material allows for air circulation, helping to keep the wearer's foot ry and comfortable.
  • the conductive threads can be woven into the fabric in a variety' of patterns and densities, depending on the desired level of conductivity.
  • the fabric top cover can be a woven material. This type of material can provide a different feel and level of comfort to the wearer.
  • the conductive threads can be woven or otherwise integrated into the fabric in a variety of ways, depending on the desired properties of the insole.
  • the fabric top cover can be a non-woven material. This type of material can offer a different texture and level of durability compared to woven materials.
  • the conductive threads can be integrated into the nonwoven material in a variety of ways, depending on the desired properties of the insole.
  • the electrical flow paths in the fabric top cover extend from side to side and front to back of the insole. This configuration ensures that the entire surface of the foot is in contact with the conductive threads, providing a consistent and reliable electrical flow path to the foam layer.
  • the base foam layer of the insole can be constructed of polyurethane closedcell foam. This type of foam is known for its durability and resilience, making it an excellent choice for an insole material.
  • the foam can be molded into a variety of shapes and sizes to fit a wide range of footwear. The density of the foam can be adjusted to provide good support to the underside of the foot of the wearer while still providing cupping of the heel and cushioning under the entire foot.
  • the electrostatic discharge chemical additive is added to the base foam layer. This additive is mixed into the liquid polyurethane material before it is molded, foamed, and cured. The additive creates polarity channels within the foam, providing an electrical pathway within the foam layer.
  • the additive can be conductive particles such as carbon powder. These particles can be mixed into the liquid polyurethane material before it is molded, foamed, and cured. The particles polarize to discharge static electricity through the foam layer, further enhancing the insole's electrostatic discharge properties.
  • the insole can be formed into a 3D supportive shape for the foot.
  • This shape can include features such as a heel cup and an arch support, providing increased comfort and foot-to-insole interface.
  • the 3D shape can be customized to fit the wearer's foot, providing a personalized fit and feel.
  • edges adjacent the toe region (toe and ball of the foot area generally) of the insole can be beveled. This feature allows the insole to better accommodate various ty pes of footwear, including work boots and other types of protective footwear.
  • the beveled edges reduce the overall volume of the insole, allowing it to fit more comfortably within the shoe.
  • all or large portions of the thickness of the region of the insole beneath the toes of the foot can be reduced. Again, this feature allows the insole to better fit within shoes with a smaller toe box, such as work boots or other types of protective footwear.
  • the bottom surface of the base foam layer can include molded-in structures. These structures can provide more or less cushioning to the foot in various regions, depending on the wearer's needs. This feature allows for a more customized level of comfort and support even with a dense foam cushion that provide heel cupping and arch support.
  • the molded-in structures can include ridges and recesses. These features can be strategically placed to provide additional support or cushioning in specific areas of the foot. For example, ridges can be placed in areas that need more support, such as the arch, while recesses can be placed in areas that need more cushioning, such as the heel. An area needing more support would have more space between ridges, for example.
  • the present invention also provides a method for creating an insole for an electrostatic discharge footwear.
  • This method involves providing a base foam layer.
  • the foam layer can be created using a variety of materials and methods, depending on the desired properties of the insole.
  • the method further involves providing a fabric top cover with conductive threads woven into the cover material. The conductive threads can be woven into the fabric using a variety of techniques, depending on the desired properties of the insole.
  • the fabric top cover is then overlaid on the base foam layer. This step creates an electrical flow path from the foot of the wearer to the base foam layer.
  • the overlaying process can be done using a variety of methods, depending on the desired properties of the insole.
  • the base foam layer can be constructed of polyurethane closed-cell foam. This type of foam can provide a high level of support and comfort to the wearer.
  • the foam can be molded into a variety of shapes and sizes to fit a wide range of footwear.
  • the density of the foam can be selected to retain supportive shape, especially to the region of the insole rearward of the toe region, such as the arch and heel region.
  • the electrostatic discharge chemical additive is added to the base foam layer. This additive is mixed into the liquid polyurethane material before it is molded, foamed, and cured. The additive creates polarity channels within the foam, providing an electrical pathway within the foam layer.
  • the additive can be conductive particles such as carbon powder. These particles can be mixed into the liquid polyurethane material before it is molded, foamed, and cured. The particles polarize to discharge static electricity through the foam layer, further enhancing the insole's electrostatic discharge properties.
  • the method can further involve forming the insole into a 3D supportive shape for a foot.
  • This shape can include features such as a heel cup and an arch support, providing increased comfort and foot interface.
  • the 3D shape can be customized to fit the wearer's foot, providing a personalized fit and feel.
  • edges adjacent the toe region of the insole can be beveled as part of the forming process. This feature allows the insole to better accommodate various types of footwear, including work boots and other types of protective footwear.
  • the beveled edges reduce the overall volume of the insole, allowing it to fit more comfortably within the shoe.
  • the thickness of the region of the insole beneath the toes of the foot can be reduced as part of the forming process. This feature allows the insole to better fit within shoes with a smaller toe box. such as work boots or other types of protective footwear.
  • the reduced thickness does not compromise the comfort or support provided by the insole. Cushion thickness under the ball of the foot can be maintained, while it can taper forw ard of the ball of the foot towards the front of the insole where a beveled edge can further reduce thickness.
  • the bottom surface of the base foam layer can include molded-in structures that provide relatively more or less cushioning to the foot in various regions of the foot. These structures can be created using a variety of methods, depending on the desired properties of the insole.
  • the present invention provides a supportive, comfortable insole that can meet or be well below required maximum levels of resistance to electrostatic discharge.
  • the insole interfaces well with a variety of footwear, making it a versatile solution for a wide range of applications.
  • the insole's unique combination of features, including its conductive threads, foam layer, and molded-in structures, provide a high level of comfort and support while also effectively discharging static electricity.
  • FIG 1 it illustrates a footwear insole 100 with electrostatic discharge properties.
  • the insole 100 includes a base 102 and a top cover 106.
  • the base includes a cushion 104.
  • the base may also include support semi-rigid or rigid structures to support the cushion.
  • the insole 100 is designed to provide both comfort and low resistance to electrostatic discharge.
  • the top cover 106 overlays the cushion 104 and provides substantial electrical flow paths from the foot of the wearer to the bottom of the base 102.
  • the base 102 is designed to be comfortable and supportive, with a heel cup 108 and an arch support 110 shaped to the bottom of the wearer's foot.
  • the toe region of the insole 100 includes a beveled edge 114 to better accommodate various types of footwear.
  • the cushion layer 104 of the insole 100 as depicted in Figure 1 can be constructed of various materials, with a preferred material being polyurethane closed-cell foam. This foam is favored due to its comfort and supportive properties.
  • the foam is elastomeric.
  • the durometer of the elastomeric foam is selected to provide the right balance of support and cushion. Preferably, the durometer is approximately 44c, based on the Asker C scale. With the preferred construction, relying on the foam for heel cup and arch support, the range of durometer is between about 41 -47c. Higher or lower durometer targets are used on other embodiments depending on the construction, shape, contour, and overall thickness of the insole.
  • the density or specific gravity’ of the polyurethan closed-cell foam is preferably in the range of 0.33 +/- 0.02. Higher or lower densities may be used, again depending on the structure, shape, contour, and overall thickness of the insole product.
  • ESD electrostatic discharge
  • the top cover 106 of the insole 100 as shown in Figure 1 is constructed with conductive threads woven integrally into the cover material. The threads run throughout the cover material from side to side and front to back, providing ample electrical flow paths from the wearer's foot to the base 102.
  • the top cover 106 is preferably constructed of a breathable knit material, but it may also be a w oven or other non-woven material.
  • the heel cup 108 and the arch support 110 are part of the 3D supportive shape of the insole 100. These features are designed to provide increased comfort and foot interface.
  • the heel cup 108 cradles the heel of the wearer, while the arch support 110 provides support to the arch of the foot. This increased foot interface enhances the ESD capability of the insole 100.
  • the top cover 106 may be made with a low er amount of conductive material to achieve the antistatic electrical conduction therethrough.
  • the beveled edge 114 in the toe region of the insole 100 as illustrated in Figures 1, 5, and 6, is designed to better accommodate various types of footwear, particularly work footw ear.
  • the protective features of work footw ear often create a decreased volume within the toe box.
  • the beveled edge 114 allows the insole 100 to better integrate within the footwear without taking up much volume.
  • the thickness of the region of the insole 100 beneath the toes of the foot can also be reduced to accommodate such footwear as further detailed below in connection with Figures 6A-C.
  • FIG 2 a cross-sectional view of the insole 100 positioned within a shoe (footwear 200) is depicted, emphasizing the interaction between the insole base 102 and the shoe's midsole 204 and/or outsole 202.
  • the figure provides a detailed view of footwear 200, the insole 100, the midsole 204, and the outsole 202.
  • the footwear 200 includes the insole 100, the midsole 204, and the outsole 202.
  • the insole 100 is positioned within the shoe and rests on the midsole 204 or a last board (shown in Figure 7).
  • the base 102 of the insole is designed to be comfortable and supportive. It is shaped to the bottom of the wearer's foot, providing a heel cup 108 and an arch support 110. This contouring not only enhances comfort but also decreases the insole's resistance to electrostatic discharge due to increased engagement with the wearer's foot.
  • the base 102 of the insole is preferably constructed with a cushion 104 made from a foam material, preferably polyurethane closed-cell foam, which is molded, foamed, and cured with an electrostatic discharge (ESD) chemical additive. This additive creates polarity channels within the foam, providing an electrical pathway.
  • ESD electrostatic discharge
  • the base 102 may also have a semi-rigid support structure beneath and/or beside at least a portion of the cushion 104 to increase support to cushion 104 and insole 100.
  • the midsole 204 is a component of the shoe that lies between the insole 100 and the outsole 202. Often the footwear also includes a last board on top of or in place of the midsole.
  • the midsole 204 provides additional support and cushioning to the w earer's foot, ft is typically softer than the outsole 202 while the outsole may be more durable.
  • the insole 100 specifically the base 102 of the insole, interacts with the midsole 204, transmitting the electrical flow from the insole 100 to the midsole 204. This interaction is facilitated by the conductive properties of the insole 100, particularly the conductive threads in the fabric top cover and the ESD chemical additive in the base foam layer.
  • the footwear 200 might also include a Strobel or last board between the insole and the midsole or outsole.
  • the outsole 202 is the bottom part of the shoe that comes in direct contact with the ground.
  • the outsole 202 is designed to be durable and provide traction.
  • the insole 100 particularly the base 102 of the insole, also interacts with the outsole 202, transmitting the electrical flow from the insole 100 to the outsole 202 through the last board and midsole, if included in the footwear. This interaction further enhances the shoe's low resistance to electrostatic discharge, making the footwear 200 safe for static-sensitive work zones.
  • Figure 3 illustrates a cross-sectional side-elevational view of the insole 100.
  • the base 102 and top cover 106 are shown.
  • the base 102 includes cushion 104.
  • the upper side of cushion 104 is generally contoured to the shape of the foot.
  • the bottom side of the cushion 104 (or base 102) and has formed recesses 302 and ribs 300 for differential cushioning.
  • the top cover 106 overlays the base 102, providing a smooth surface for the foot of the w earer.
  • Figure 4A presents a top view of the insole with an ESD fabric top cover 106 and contoured heel cup 108 and arch support 110 designed to fit the wearer's foot shape.
  • the ESD fabric top cover 106 overlays a base foam layer (not shown in this figure) and is woven with conductive threads that provide electrical flow paths from the foot of the wearer to the foam layer.
  • the contoured heel cup 108 and arch support 110 are designed to provide both comfort and lower ESD resistance due to more engagement w ith the wearer's foot.
  • Figure 4B shows the fabric top cover 106 prior to being molded with the cushion 104. Once molded with the cushion 104, the top cover 106 is trimmed, preferably by die cutting the fabric to match the shape of the cushion 104 and as shown in Figure 4A.
  • the top cover 106 includes a top face 402 and a bottom face 404.
  • Bottom face 404 includes a film 406.
  • Film 406 helps bond cushion 104 to top cover 106 while limiting penetration of the uncured cushion material (polyurethan liquid base) through the fabric of top cover 106.
  • film 406 is a thin polyurethane film layer applied only to the bottom of top cover 106.
  • the film 406 used has a very low electrical resistance so as to not significantly impact the overall static discharge of the insole.
  • the thickness is preferably about 0.02mm and can be in the range of 0. 10mm to 0.01 mm.
  • the bottom of the inventive insole 100 is illustrated.
  • the figures show the various structural features of the insole, including the insole bottom, a beveled toe edge 114, and a tread pattern 500. These features are designed to provide comfort to the wearer and accommodate different types of footwear.
  • the insole 100 features a heel cup 108, arch support 110, beveled toe edges 114.
  • the insole also includes a base cushion structure or tread pattern 500 with ribs 300 and recesses 302.
  • the insole 100 is designed to provide a comfortable orthotic with low resistance to electrostatic discharge.
  • the base 102 provides the overall shape and support for the insole 100. As described previously, it is constructed from a foam layer.
  • the ribs 300 and recesses 302 are molded into the bottom surface of the base cushion structure 500. These structures provide varying levels of cushioning to different regions of the foot, allowing for a customized level of comfort and support. For example, variations for heel strike and toe push may be made.
  • the base structure 500 can also provide extra friction between the bottom of the insole 100 and the last board or midsole. This will help hold the insole in place for better foot stability .
  • the tread pattern 500 is molded into the bottom surface of the base cushion layer.
  • the tread pattern can include various ridges and recesses that are strategically placed to provide more or less cushioning to different regions of the foot, such as the heel strike and toe push areas. This feature enhances the insole's comfort and support, while also improving its interface with the foot.
  • the beveled toe edge 114 enhances its compatibility with various types of footwear.
  • the beveled edge allow s the insole to better fit within the toe box 208 of the shoe 200, especially in w ork footw ear w here protective features often decrease the available volume. This design consideration ensures that the insole can provide support and comfort without taking up excessive space.
  • Figure 6B shows a sulcus line 602 between the regions of the insole that correspond to the ball of the foot and the toes of the foot.
  • the thickness of the insole rearw ard (towards the heel) of the sulcus line 602 is approximately 5.0mm.
  • a slight taper of the bottom surface of the cushion 104 then extends to the toe end of the insole such that the thickness of the insole is approximately 3.1mm.
  • the reduction in thickness extends forward from the sulcus line 602 to the toe end of the insole at the beveled edge 114 and a rounded tip 608.
  • the progression of the taper is shown by lines 610.
  • FIG. 7 illustrates the interior of a shoe, denoted by reference numeral 200.
  • the shoe 200 includes a last board 700, which is shown with conductive stitching 702.
  • the conductive stitching 702 creates a conductive path from the insole to the midsole 204 or outsole 202.
  • the last board 700 is an integral part of the shoe 200 and serves as the foundation on which the shoe is constructed. It is typically made from a durable material that can withstand the wear and tear of daily use.
  • the conductive stitching 702 is woven into the last board 700.
  • the stitching 702 is composed of conductive threads that are designed to provide a path for electrical flow. Since the insole 100 with cushion 104 is layered above the last board 700, the threads sewn through the last board are not felt by the wearer.
  • the density of the electrical threads (conductive stitching 702) through the last board can be provided to achieve the desired conductive flow from the insole 100 to the midsole and or outsole. Other means of providing a conductive last board are also possible.
  • the midsole 204 and the outsole 202 are the parts of the shoe 200 that come into direct contact with the ground.
  • the midsole 204 is typically made from a material that can absorb shock and provide cushioning, while the outsole 202 is designed to provide traction and resist wear.
  • the conductive path created by the conductive stitching 702 extends from the insole, through the last board 700, and to the midsole 204 and/or the outsole 202. This allows for the discharge of static electricity, thereby enhancing the ESD capability of the shoe 200.
  • Figure 8 shows a further embodiment that includes a support member 800.
  • Support member 800 is more rigid than cushion 104.
  • Support member 800 may be, for example, a plastic material rather than a foam material.
  • Support member 800 cradles cushion 104 to hold it in place and still provide support even with a less dense foam in cushion 104. However, as shown in Figure 8, at least half of the bottom surface of base 102 exposes cushion 104. Thus, support member 800 does not need to be discharge conductive to provide adequate dissipation of static electricity. Support member 800 preferably surrounds heel cup 108 and underlies at least a portion of arch support 110 of cushion 104.
  • support member 800 exposes a central region of cushion 104 beneath heel cup 108. This provides conducive dissipation over a large area and also allows support member 800 to flex inwardly or outwardly to accommodate footwear of various widths.
  • support member 800 may also include conductive material therein to provide static electricity dissipation.
  • the insole designed as per the innovative aspects of the present invention is not just functionally superior, but also excels in providing user comfort.
  • the insole is formed into a 3D supportive shape for the foot. This shape includes design elements such as a heel cup and an arch support. These features are intended to enhance the comfort of the wearer and to increase foot interface, thereby naturally improving the ESD capability of the insole.
  • the present invention also addresses the common issue of footwear compatibility 7 .
  • the edges adjacent to the toe region are beveled. This design element allows the insole to better fit within the toe box of various types of footwear, especially work footwear where the protective features often decrease the available volume. Similarly, the thickness of the region of the insole beneath the ball and toes of the foot can be reduced to accommodate such footwear, ensuring the comfort of the wearer is not compromised.
  • the botom surface of the base cushion layer of the insole may also be tailored to enhance comfort.
  • the botom surface includes molded-in structures that provide relatively more or less cushioning to the foot in the various regions. For example, the structures may take the form of ridges and recesses, strategically placed to create regions that provide more or less cushioning. This allows for a customized level of comfort and support to the wearer, further enhancing the usability of the insole.
  • the present invention offers several advantages including its enhanced comfort, improved interface with the foot, and efficient electrostatic discharge.
  • the contoured 3D shape for the foot, the conductive threads in the fabric top layer, and the ESD chemical additive in the base foam layer work synergistically to create an insole that is both comfortable and effective in reducing ESD resistance.
  • the beveled edge of the toe region of the cushion layer of the base and the adjustable thickness beneath the ball and toes of the foot beter accommodates work footwear, making this insole a versatile solution for all types of footwear.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

La présente invention concerne une semelle intérieure avancée pour article chaussant à décharge électrostatique. La semelle intérieure comprend une couche de mousse de base et un couvercle supérieur en tissu doté de fils conducteurs tissés dans le matériau de revêtement, fournissant des trajets d'écoulement électrique du pied d'un utilisateur à la couche de mousse de base. Un additif chimique à décharge électrostatique est incorporé dans la couche de mousse de base, créant des canaux de polarité pour un trajet électrique à l'intérieur de la couche de mousse. La semelle intérieure est conçue sous une forme de support 3D pour un confort et une interface de pied accrus, comprenant une coque talonnière et un support de voûte plantaire. Les bords adjacents à la région d'orteil sont biseautés pour recevoir divers articles chaussants, et la surface inférieure de la couche de mousse de base comprend des structures moulées qui fournissent des degrés variables d'amortissement à différentes régions du pied. Cette nouvelle conception de semelle intérieure améliore le confort tout en garantissant une décharge électrostatique efficace, ce qui s'avère avantageux pour diverses applications en ce qui concerne les articles chaussants.
PCT/US2025/016732 2024-02-26 2025-02-21 Semelle intérieure à décharge électrostatique Pending WO2025183985A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US202463557765P 2024-02-26 2024-02-26
US63/557,765 2024-02-26
US18/647,793 2024-04-26
US18/647,793 US20250268334A1 (en) 2024-02-26 2024-04-26 Electrostatic discharge insole

Publications (1)

Publication Number Publication Date
WO2025183985A1 true WO2025183985A1 (fr) 2025-09-04

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5319867A (en) * 1991-12-12 1994-06-14 Spenco Medical Corporation Electrically conductive shoe insole
US8914996B2 (en) 2011-02-14 2014-12-23 Global Action Inc. Antistatic insole
US20170095037A1 (en) * 2009-03-26 2017-04-06 Ronald James Stratten Weighted shoe insole and method for making the same
US10413014B2 (en) * 2013-12-20 2019-09-17 Medicovi Aps Balance-improving liquid-filled insole for use in therapeutics, rehabilitation, standing and walking work and sports
EP3744206B1 (fr) 2019-05-24 2023-03-01 Siretessile S.r.l. Multicouche améliorée pour semelle
US20230413942A1 (en) 2020-10-09 2023-12-28 U-Power Group S.P.A. Electrically dissipative removable insole, particularly for professional work shoes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5319867A (en) * 1991-12-12 1994-06-14 Spenco Medical Corporation Electrically conductive shoe insole
US20170095037A1 (en) * 2009-03-26 2017-04-06 Ronald James Stratten Weighted shoe insole and method for making the same
US8914996B2 (en) 2011-02-14 2014-12-23 Global Action Inc. Antistatic insole
US10413014B2 (en) * 2013-12-20 2019-09-17 Medicovi Aps Balance-improving liquid-filled insole for use in therapeutics, rehabilitation, standing and walking work and sports
EP3744206B1 (fr) 2019-05-24 2023-03-01 Siretessile S.r.l. Multicouche améliorée pour semelle
US20230413942A1 (en) 2020-10-09 2023-12-28 U-Power Group S.P.A. Electrically dissipative removable insole, particularly for professional work shoes

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