US20060026865A1 - Insole - Google Patents
Insole Download PDFInfo
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- US20060026865A1 US20060026865A1 US10/919,085 US91908504A US2006026865A1 US 20060026865 A1 US20060026865 A1 US 20060026865A1 US 91908504 A US91908504 A US 91908504A US 2006026865 A1 US2006026865 A1 US 2006026865A1
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- Prior art keywords
- insole
- cushioning layer
- pillow
- insole according
- footwear
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- 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.)
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- 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
- A43B17/02—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined wedge-like or resilient
- A43B17/026—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined wedge-like or resilient filled with a non-compressible fluid, e.g. gel, water
-
- 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
- A43B17/18—Arrangements for attaching removable insoles to footwear
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B3/00—Footwear characterised by the shape or the use
- A43B3/0036—Footwear characterised by the shape or the use characterised by a special shape or design
- A43B3/0057—S-shaped
Definitions
- the present invention relates generally to shoe insoles or inserts, and more particularly, to insoles particularly adapted to be used with open style footwear.
- insoles which fit within shoes in order to correct various foot problems, alleviate pain and otherwise provide more comfort to the wearer.
- examples of such insoles are those sold by the assignee of the present invention under the trademark Dr. SCHOLL'S®.
- the wearer's foot is restricted by the upper which is connected to the outer and/or inner sole.
- any insole placed therein is also limited by the same upper.
- the edges of the insole can be relatively thick, since the wearer will not notice such thickness at the edges.
- the wearer may notice a step between the relatively thick edge of the insole and the inner sole of the footwear, causing discomfort to the wearer.
- an insole for insertion into footwear includes at least one of a forefoot portion and a heel portion; at least one of the forefoot portion and heel portion being formed by a cushioning layer of a resilient material which provides a cushioning function, and a substantially dome shaped pillow extending down from the cushioning layer; and an arrangement for maintaining the insole in position in the footwear during a gait.
- the insole is a full length insole formed from the forefoot portion, the heel portion and a mid-foot portion connecting together the forefoot portion and the heel portion.
- the cushioning layer extends through the forefoot portion, heel portion and mid-foot portion, and each of the forefoot portion and heel portion includes a substantially dome shaped pillow extending down from the cushioning layer thereat.
- the cushioning layer and the pillow are formed from the same material as a unitary, one-piece structure.
- the cushioning layer and pillow are formed from a foam material.
- the arrangement for maintaining the insole in position can include either an adhesive at a lower surface of the insole, or for example, a non-permanent adhesive that permits removal of the insole from the footwear and repositioning the insole in the footwear, or alternatively, a high friction lower surface of the insole.
- the cushioning layer and pillow are formed from a viscoelastic gel material.
- the arrangement for maintaining the insole in position includes either a non-permanent adhesive at the lower surface, or a tackifier added to the gel material.
- the gel material under the dome shaped pillow is formed by a plurality of spaced apart spring walls formed from the viscoelastic gel, the spring walls extending from a lower surface of the cushioning layer.
- the spring walls each have a height which is greatest at a center of the pillow and which tapers in height toward edges of the pillow.
- each of the spring walls is formed in a generally sinusoidal wave shape.
- the cushioning layer has a substantially uniform thickness of about 2 mm and the pillow has a height less than about 3 mm above the uniform layer, and the cushioning layer tapers in thickness toward a periphery of the insole.
- a top cover can also be secured to an upper surface of the cushioning layer.
- FIG. 1 is a perspective view of a left insole according to a first embodiment of the present invention
- FIG. 2 is a top plan view of the left insole
- FIG. 3 is a bottom plan view of the left insole according to one embodiment
- FIG. 4 is a front elevational view of the left insole FIG. 4 ;
- FIG. 5 is a right side elevational view of the left insole
- FIG. 6 is a cross-sectional view of the left insole, taken along line 6 - 6 of FIG. 2 ;
- FIG. 7 is a bottom plan view of a left insole according to a second embodiment of the present invention.
- FIG. 8 is a cross-sectional view of the left insole of FIG. 7 , taken along line 8 - 8 thereof;
- FIG. 9 is a perspective view of a portion of the left insole of FIG. 7 .
- a left insole 10 according to a first embodiment of the present invention is adapted to be placed in an article of footwear, as is well known.
- a right insole (not shown) is identical to left insole 10 and is a mirror image thereof.
- Insole 10 was designed to fit the shape of a human left foot and therefore includes a curved toe or forefoot portion 12 , a heel portion 14 , and a mid-foot portion 16 which connects forefoot portion 12 and heel portion 14 together.
- Insole 10 is formed by a generally planar cushioning layer 18 , having a generally dome shaped, lower pillow 20 extending from the lower surface of cushioning layer 18 at forefoot portion 12 and a generally dome shaped, lower pillow 22 extending from the lower surface of cushioning layer 18 at heel portion 14 .
- layer 18 and pillows 20 and 22 are formed as a unitary, one-piece layer of the same material, which is preferably a polyurethane foam.
- insole 10 formed by cushioning layer 18 and pillows 20 and 22 is made from a resilient foam material that provides a conventional cushioning function.
- cushioning layer 18 and pillows 20 and 22 are a typical foam mechanical spring, shock absorption layer that cushions the foot, in order to decrease pressure.
- Cushioning layer 18 and pillows 20 and 22 can be made from any suitable material including, but not limited to, any flexible material which can cushion and absorb the shock from heel strike on the insole.
- Suitable shock absorbing materials can include any suitable foam, such as but not limited to, cross-linked polyethylene, poly(ethylene-vinyl acetate), polyvinyl chloride, synthetic and natural latex rubbers, neoprene, block polymer elastomer of the acrylonitrile-butadiene-styrene or styrene-butadienestyrene type, thermoplastic elastomers, ethylenepropylene rubbers, silicone elastomers, polystyrene, polyurea or polyurethane; most preferably a polyurethane foam made from flexible polyol chain and an isocyanate such as a monomeric or prepolymerized diisocyanate based on 4,4′-diphenylmethane diisocyanate (MDI) or toluene
- foams can be blown with freon, water, methylene chloride or other gas producing agents, as well as by mechanically frothing to prepare the shock absorbing resilient layer.
- foams advantageously can be molded into the desired shape or geometry.
- Non-foam elastomers such as the class of materials known as viscoelastic polymers, or silicone gels, which show high levels of damping when tested by dynamic mechanical analysis performed in the range of ⁇ 50 degrees C. to 100 degrees C. may also be advantageously employed.
- a resilient polyurethane can be prepared from diisocyanate prepolymer, polyol, catalyst and stabilizers which provide a waterblown polyurethane foam of the desired physical attributes.
- Suitable diisocyanate prepolymer and polyol components include polymeric MDI M-10 (CAS 9016-87-9) and Polymeric MDI MM-103 (CAS 25686-28-6), both available from BASF, Parsippany, N.J.; Pluracol 945 (CAS 9082-00-2) and Pluracol 1003, both available from BASF, Parsippany, N.J.; Multrinol 9200, available from Mobay, Pittsburgh, Pa.; MDI diisocyanate prepolymer XAS 10971.02 and polyol blend XUS 18021.00 available from the Dow Chemical Company, Midland, Mich.; and Niax 34-28, available from Union Carbide, Danbury, Conn.
- urethane systems generally contain a surfactant, a blowing agent, and an ultra-violet stabilizer and/or catalyst package.
- Suitable catalysts include Dabco 33-LV (CAS 280-57-9,2526-71-8), Dabco X543 (CAS Trade Secret), Dabco T-12 (CAS 77-58-7), and Dabco TAC (CAS 107-21-1) all obtainable from Air Products Inc., Allentown, Pa.; Fomrez UL-38, a stannous octoate, from the Witco Chemical Co., New York, N.Y. or A-1 (CAS 3033-62-3) available from OSI Corp., Norcross, Ga.
- Suitable stabilizers include Tinuvin 765 (CAS 41556-26-7), Tinuvin 328 (CAS 25973-55-1), Tinuvin 213 (CAS 104810-48-2), Irganox 1010 (CAS 6683-19-8), Irganox 245 (CAS 36443-68-2), all available from the Ciba Geigy Corporation, Greensboro, N.C., or Givsorb UV-1 (CAS 057834-33-0) and Givsorb UV-2 (CAS 065816-20-8) from Givaudan Corporation, Clifton, N.J.
- Suitable surfactants include DC-5169 (a mixture), DC190 (CAS68037-64-9), DC197 (CAS69430-39-3), DC-5125 (CAS 68037-62-7) all available from Air Products Corp., Allentown Pa. and L-5302 (CAS trade secret) from Union Carbide, Danbury Conn.
- lower layer 18 can be a laminate construction, that is, a multilayered composite of any of the above materials. Multilayered composites are made from one or more of the above materials such as a combination of polyethylene vinyl acetate and polyethylene (two layers), a combination of polyurethane and polyvinyl chloride (two layers) or a combination of ethylene propylene rubber, polyurethane foam and ethylene vinyl acetate (3 layers).
- cushioning layer 18 and pillows 20 and 22 are made from a urethane molded material, and more preferably, a polyurethane elastomer material.
- cushioning layer 18 and pillows 20 and 22 can be prepared by conventional methods such as heat sealing, ultrasonic sealing, radio-frequency sealing, lamination, thermoforming, reaction injection molding, and compression molding and, if necessary, followed by secondary die-cutting or in-mold die cutting. Representative methods are taught, for example, in U.S. Pat. Nos. 3,489,594; 3,530,489 4,257,176; 4,185,402; 4,586,273, in the Handbook of Plastics, Herber R. Simonds and Carleton Ellis, 1943, New York, N.Y., Reaction Injection Molding Machinery and Processes, F.
- the innersole can be prepared by a foam reaction molding process such as taught in U.S. Pat. No. 4,694,589.
- Pillows 20 and 22 extend downwardly below the lower surface 18 a of cushioning layer 18 to provide extra cushioning at the ball of the foot area of forefoot portion 12 and at heel portion 14 .
- cushioning layer 18 has a constant thickness throughout, although cushioning layer 18 preferably tapers in thickness toward the peripheral edge 18 b of insole 10 in order to prevent a user from feeling an edge drop-off.
- cushioning layer 18 can have a thickness of about 2 mm which tapers down to a thickness of about 1 mm at the peripheral edge 18 b of insole 10 , and with the combined thickness of cushioning layer and either pillow 20 or 22 having a thickness of about 5 mm.
- top cover layer 24 can be secured to the upper surface of cushioning layer 18 , although such a top cover layer 24 is not required.
- top cover layer 24 can be made from any suitable material including, but not limited to, fabrics, leather, leatherboard, expanded vinyl foam, flocked vinyl film, coagulated polyurethane, latex foam on scrim, supported polyurethane foam, laminated polyurethane film or in-mold coatings such as polyurethanes, styrene-butadiene-rubber, acrylonitrile-butadiene, acrylonitrile terpolymers and copolymers, vinyls, or other acrylics, as integral top covers. Desirable characteristics of top cover layer 24 include good durability, stability and visual appearance.
- top cover layer 24 have good flexibility, as indicated by a low modulus, in order to be easily moldable.
- the bonding surface of top cover layer 24 should provide an appropriate texture in order to achieve a suitable mechanical bond to the upper surface of cushioning layer 18 .
- the material of top cover layer 24 is a fabric, such as a brushed knit laminate top cloth (brushed knit fabric/urethane film/non-woven scrim cloth laminate) or a urethane knit laminate top cloth.
- top cover layer 24 is made from a polyester fabric material, and preferably has a thickness of about 0.02 inch.
- insole 10 is preferably a full length insole, that is, extends along the entire foot.
- insole 10 would be sized corresponding to shoe sizes and would be provided in sized pairs.
- insole 10 may be trimmed to the requirements of the user.
- arcuate pattern trim lines (not shown) may be formed on the lower surface of forefoot portion 12 of insole 10 , which are representative of various sizes of the human foot.
- the pattern trim lines may be imprinted by conventional printing techniques, silkscreening and the like.
- the pattern trim lines may be formed as shallow grooves, or be perforated, so that a smaller size insole may be separated by tearing along the appropriate trim lines, which tearing operation is facilitated by the inclusion of perforations.
- forefoot portion 12 can be trimmed so that forefoot portion 12 fits within the toe portion of open style footwear.
- a pattern trim line can be provided on the lower surface of cushioning layer 18 to cut around the thong of some types of open style footwear, if necessary.
- insole 10 may be a 3 ⁇ 4 length insole designed to fit a range of shoe sizes without the need of trimming. In this regards, insole 10 extends along the approximately 3 ⁇ 4 of the foot, from the heel to the ball of the foot.
- an area of adhesive 26 is formed along the length of the lower surface of cushioning layer 18 , and is covered by a release sheet 28 .
- Adhesive 26 can be a permanent adhesive or a release adhesive that permits removal and reapplying or repositioning of insole 10 in the footwear.
- lower surface 18 a of cushioning layer 18 can be provided as a high friction surface to maintain insole 10 in position in the footwear.
- synthetic rubber adhesive coating (not shown) can be added to lower surface 18 a of cushioning layer 18 for this purpose.
- cushioning pillows 20 and 22 are provided at the ball of the foot area of forefoot portion 12 and at heel portion 14 where most of the impact and forces occur during a gait. Further, such insole 10 fits within open style footwear, and will remain in position in such open style footwear during wearing by the user. At the same time, however, the wearer, because of the taper at the peripheral edge thereof, does not feel any edge drop-off, thereby enhancing comfort to the wearer.
- a left insole 110 according to a second embodiment of the present invention will now be described.
- a right insole (not shown) is identical to left insole 110 and is a mirror image thereof.
- Insole 110 has the same shape as insole 10 of FIGS. 1-6 , and therefore includes a curved toe or forefoot portion 112 , a heel portion 114 , and a mid-foot portion 116 which connects forefoot portion 112 and heel portion 114 together.
- Insole 110 is formed by a generally planar cushioning layer 118 , having a generally dome shaped, lower pillow 120 extending from the lower surface of cushioning layer 118 at forefoot portion 112 and a generally dome shaped, lower pillow 122 extending from the lower surface of cushioning layer 118 at heel portion 114 .
- layer 118 and pillows 120 and 122 are formed as a unitary, one-piece layer of a gel material.
- the gel material can be of the same general type described in U.S. Pat. No. 6,598,321 to the same assignee herein, and the entire disclosure of which is incorporated herein by reference.
- gel layer 118 and pillows 120 and 122 can be made from a non-foam elastomer such as the class of materials known as viscoelastic polymers or silicone gels, which show high levels of damping when tested by dynamic mechanical analysis performed in the range of ⁇ 50 degree Celsius to 100 degrees Celsius. Because the mechanical properties of the gel are more viscous than elastic, the gel provides a high energy absorption.
- a non-foam elastomer such as the class of materials known as viscoelastic polymers or silicone gels, which show high levels of damping when tested by dynamic mechanical analysis performed in the range of ⁇ 50 degree Celsius to 100 degrees Celsius. Because the mechanical properties of the gel are more viscous than elastic, the gel provides a high energy absorption.
- Gels that can be used according to the present invention are thermoplastic elastomers (elastomeric materials), such as materials made from many polymeric families, including but not limited to the Kraton family of styrene-olefin-rubber block copolymers, thermoplastic polyurethanes, thermoset polyurethanes, thermoplastic poly olefins, polyamides, polyureas, polyesters and other polymer materials that reversibly soften as a function of temperature.
- thermoplastic elastomers elastomeric materials
- materials made from many polymeric families including but not limited to the Kraton family of styrene-olefin-rubber block copolymers, thermoplastic polyurethanes, thermoset polyurethanes, thermoplastic poly olefins, polyamides, polyureas, polyesters and other polymer materials that reversibly soften as a function of temperature.
- the preferred elastomers are a Kraton block copolymer of styrene/ethylene-co-butylene/styrene or styrene/butadiene/styrene with mineral oil incorporated into the matrix as a plasticizer, or polyurethane gels.
- Insole 110 can be secured to the open style footwear by using the tack properties of the gel.
- the tack of the gel is enhanced by incorporating a tackifier into the gel composition to increase the friction/tack of the gel surface.
- Suitable tackifiers include a petroleum hydrocarbon resin sold under the designation I-Mark V by Idemitsu Kosan Co., Ltd. of Tokyo, Japan; the rosin sold under the trademark ASYLVALITE® under designation RE 80 for SEBS gels; and phenolsulfonic acid ester sold under the trademark AMESAMOLL® for a polyurethane (PU) gel.
- the desired tack is preferably between 120 and 250 grams, as determined by a probe tack tester sold under the trademark APOLYKEN®, at one second contact time.
- dome shaped pillows 120 and 122 are formed by thin and spaced apart elastic and resilient spring walls 130 and 132 which are formed integrally as one piece with cushioning layer 118 in a repeating order, extending down from the lower surface of layer 118 at forefoot portion 112 and heel portion 114 .
- Thin spring walls 130 extend substantially in the lengthwise direction of insole 110 from the forward end to the rearward end of pillow 120 .
- the height of spring walls 130 extends down such that spring walls 130 located toward the center of pillow 120 have a greater height than spring walls 130 located toward the edges of pillow 120 , with spring walls 130 therebetween tapering down, as shown best in FIG. 7 .
- the lower ends of spring walls 130 in pillow 120 form a substantially dome shape.
- the overall thicknesses or heights of cushioning layer 118 and pillows 120 and 122 are similar to those of cushioning layer 18 and pillows 20 and 22 , as described above. As a result, the height of spring walls 130 at the center of each pillow can reach a height of about 2-3 mm above the uniform layer, and the constant or uniform thickness or height of cushioning layer 118 can be about 2 mm.
- thin elastic and resilient spring walls 132 are formed in a V-shaped pattern in pillow 122 at heel portion 114 .
- Spring walls 132 are formed with the same varying height as spring walls 130 .
- the heights of spring walls 132 extend down such that spring walls 132 located toward the center of pillow 122 have a greater height than spring walls 132 located toward the edges of pillow 122 , with spring walls 132 therebetween tapering down.
- the lower ends of spring walls 132 in pillow 122 form a substantially dome shape.
- the overall thicknesses or heights of cushioning layer 118 and pillows 120 and 122 are similar to those of cushioning layer 18 and pillows 20 and 22 , as described above.
- the heights of spring walls 132 at the center of each pillow can reach a height of about 2-3 mm, and the constant or uniform thickness or height of cushioning layer 118 can be about 2 mm.
- thin, spaced apart spring walls 130 and 132 are formed as parallel, spaced apart, sinusoidal shaped wave patterns.
- the present invention is not so limited, and can be formed as any of the embodiments described in U.S. Pat. No. 6,598,321. Further, the spacing between thin spring walls 130 , 132 , the number of spring walls 130 , 132 , the pitch of the sinusoidal wave patterns in the spring walls 130 , 132 , etc. may also be varied.
- cushioning layer 118 preferably tapers in thickness toward the peripheral edge 118 b of insole 110 in order to prevent a user from feeling an edge drop-off.
- cushioning layer 118 can have a uniform thickness of 2 mm which tapers down to a thickness of about 1 mm at the peripheral edge 118 b of insole 110 .
- top cover layer (not shown), which is the same as top cover layer 24 , can be secured to the upper surface of cushioning layer 118 , although such a top cover layer is not required.
- the present invention is also applicable to insoles other than full length insoles, such as heel cushions and ball of foot cushions.
- the present invention has been discussed in relation to a removable insole, it can be incorporated as a permanent inner sole in footwear, such as a shoe or the like.
Abstract
Description
- The present invention relates generally to shoe insoles or inserts, and more particularly, to insoles particularly adapted to be used with open style footwear.
- Various types of insoles are known which fit within shoes in order to correct various foot problems, alleviate pain and otherwise provide more comfort to the wearer. Examples of such insoles are those sold by the assignee of the present invention under the trademark Dr. SCHOLL'S®.
- However, when wearing open style footwear where the perimeter of the footwear is exposed, such as sandals, clogs, slides, slingbacks and the like, the boundary of the footwear is not sufficient to hold the insole in position during a normal gait. As a result, such insoles cannot be used with open style footwear.
- Further, with conventional shoes, the wearer's foot is restricted by the upper which is connected to the outer and/or inner sole. As a result, any insole placed therein is also limited by the same upper. This means that the edges of the insole can be relatively thick, since the wearer will not notice such thickness at the edges. However, this is not true with open style footwear in which the wearer's foot is given greater freedom of movement. As a result, the wearer may notice a step between the relatively thick edge of the insole and the inner sole of the footwear, causing discomfort to the wearer.
- Accordingly, it is an object of the present invention to provide an insole that overcomes the problems with the aforementioned prior art.
- It is another object of the present invention to provide an insole that can be worn with open style footwear.
- It is still another object of the present invention to provide an insole that remains in place in the open style footwear during use.
- It is yet another object of the present invention to provide an insole that provides cushioning at the forefoot and heel areas.
- It is a further object of the present invention to provide an insole that tapers in thickness toward the peripheral edges thereof.
- It is a yet further object of the present invention to provide an insole that is easy and economical to make and use.
- In accordance with an aspect of the present invention, an insole for insertion into footwear, includes at least one of a forefoot portion and a heel portion; at least one of the forefoot portion and heel portion being formed by a cushioning layer of a resilient material which provides a cushioning function, and a substantially dome shaped pillow extending down from the cushioning layer; and an arrangement for maintaining the insole in position in the footwear during a gait.
- Preferably, the insole is a full length insole formed from the forefoot portion, the heel portion and a mid-foot portion connecting together the forefoot portion and the heel portion. More preferably, the cushioning layer extends through the forefoot portion, heel portion and mid-foot portion, and each of the forefoot portion and heel portion includes a substantially dome shaped pillow extending down from the cushioning layer thereat.
- The cushioning layer and the pillow are formed from the same material as a unitary, one-piece structure.
- In one embodiment, the cushioning layer and pillow are formed from a foam material. In such case, the arrangement for maintaining the insole in position can include either an adhesive at a lower surface of the insole, or for example, a non-permanent adhesive that permits removal of the insole from the footwear and repositioning the insole in the footwear, or alternatively, a high friction lower surface of the insole.
- In another embodiment, the cushioning layer and pillow are formed from a viscoelastic gel material. In such case, the arrangement for maintaining the insole in position includes either a non-permanent adhesive at the lower surface, or a tackifier added to the gel material. Preferably, the gel material under the dome shaped pillow is formed by a plurality of spaced apart spring walls formed from the viscoelastic gel, the spring walls extending from a lower surface of the cushioning layer. The spring walls each have a height which is greatest at a center of the pillow and which tapers in height toward edges of the pillow. Preferably, each of the spring walls is formed in a generally sinusoidal wave shape.
- Preferably, the cushioning layer has a substantially uniform thickness of about 2 mm and the pillow has a height less than about 3 mm above the uniform layer, and the cushioning layer tapers in thickness toward a periphery of the insole.
- A top cover can also be secured to an upper surface of the cushioning layer.
- The above and other features of the invention will become readily apparent from the following detailed description thereof which is to be read in connection with the accompanying drawings.
-
FIG. 1 is a perspective view of a left insole according to a first embodiment of the present invention; -
FIG. 2 is a top plan view of the left insole; -
FIG. 3 is a bottom plan view of the left insole according to one embodiment; -
FIG. 4 is a front elevational view of the left insoleFIG. 4 ; -
FIG. 5 is a right side elevational view of the left insole; -
FIG. 6 is a cross-sectional view of the left insole, taken along line 6-6 ofFIG. 2 ; -
FIG. 7 is a bottom plan view of a left insole according to a second embodiment of the present invention; -
FIG. 8 is a cross-sectional view of the left insole ofFIG. 7 , taken along line 8-8 thereof; and -
FIG. 9 is a perspective view of a portion of the left insole ofFIG. 7 . - Referring to the drawings in detail, and initially to
FIGS. 1-6 thereof, aleft insole 10 according to a first embodiment of the present invention is adapted to be placed in an article of footwear, as is well known. A right insole (not shown) is identical toleft insole 10 and is a mirror image thereof. -
Insole 10 was designed to fit the shape of a human left foot and therefore includes a curved toe orforefoot portion 12, aheel portion 14, and amid-foot portion 16 which connectsforefoot portion 12 andheel portion 14 together. -
Insole 10 is formed by a generallyplanar cushioning layer 18, having a generally dome shaped,lower pillow 20 extending from the lower surface ofcushioning layer 18 atforefoot portion 12 and a generally dome shaped,lower pillow 22 extending from the lower surface ofcushioning layer 18 atheel portion 14. - In one embodiment,
layer 18 andpillows insole 10 formed bycushioning layer 18 andpillows cushioning layer 18 andpillows -
Cushioning layer 18 andpillows lower layer 18 can be a laminate construction, that is, a multilayered composite of any of the above materials. Multilayered composites are made from one or more of the above materials such as a combination of polyethylene vinyl acetate and polyethylene (two layers), a combination of polyurethane and polyvinyl chloride (two layers) or a combination of ethylene propylene rubber, polyurethane foam and ethylene vinyl acetate (3 layers). - Preferably,
cushioning layer 18 andpillows - The materials of
cushioning layer 18 andpillows -
Pillows cushioning layer 18 to provide extra cushioning at the ball of the foot area offorefoot portion 12 and atheel portion 14. Preferably,cushioning layer 18 has a constant thickness throughout, althoughcushioning layer 18 preferably tapers in thickness toward the peripheral edge 18 b ofinsole 10 in order to prevent a user from feeling an edge drop-off. For example,cushioning layer 18 can have a thickness of about 2 mm which tapers down to a thickness of about 1 mm at the peripheral edge 18 b ofinsole 10, and with the combined thickness of cushioning layer and eitherpillow - A
top cover layer 24 can be secured to the upper surface ofcushioning layer 18, although such atop cover layer 24 is not required. In such case,top cover layer 24 can be made from any suitable material including, but not limited to, fabrics, leather, leatherboard, expanded vinyl foam, flocked vinyl film, coagulated polyurethane, latex foam on scrim, supported polyurethane foam, laminated polyurethane film or in-mold coatings such as polyurethanes, styrene-butadiene-rubber, acrylonitrile-butadiene, acrylonitrile terpolymers and copolymers, vinyls, or other acrylics, as integral top covers. Desirable characteristics oftop cover layer 24 include good durability, stability and visual appearance. It is also desirable thattop cover layer 24 have good flexibility, as indicated by a low modulus, in order to be easily moldable. The bonding surface oftop cover layer 24 should provide an appropriate texture in order to achieve a suitable mechanical bond to the upper surface ofcushioning layer 18. Preferably, the material oftop cover layer 24 is a fabric, such as a brushed knit laminate top cloth (brushed knit fabric/urethane film/non-woven scrim cloth laminate) or a urethane knit laminate top cloth. Preferably,top cover layer 24 is made from a polyester fabric material, and preferably has a thickness of about 0.02 inch. - It will be appreciated that
insole 10 is preferably a full length insole, that is, extends along the entire foot. Typically,insole 10 would be sized corresponding to shoe sizes and would be provided in sized pairs. Alternatively,insole 10 may be trimmed to the requirements of the user. In this regard, arcuate pattern trim lines (not shown) may be formed on the lower surface offorefoot portion 12 ofinsole 10, which are representative of various sizes of the human foot. The pattern trim lines may be imprinted by conventional printing techniques, silkscreening and the like. As an alternative, the pattern trim lines may be formed as shallow grooves, or be perforated, so that a smaller size insole may be separated by tearing along the appropriate trim lines, which tearing operation is facilitated by the inclusion of perforations. Thus,forefoot portion 12 can be trimmed so thatforefoot portion 12 fits within the toe portion of open style footwear. - Alternatively, a pattern trim line can be provided on the lower surface of
cushioning layer 18 to cut around the thong of some types of open style footwear, if necessary. - Alternatively,
insole 10 may be a ¾ length insole designed to fit a range of shoe sizes without the need of trimming. In this regards,insole 10 extends along the approximately ¾ of the foot, from the heel to the ball of the foot. - In order to secure
insole 10 to the open style footwear, an area of adhesive 26, for example, by a double sided adhesive tape, is formed along the length of the lower surface ofcushioning layer 18, and is covered by arelease sheet 28. In this manner, a user merely removesrelease sheet 28 and adheresinsole 10 to the footwear.Adhesive 26 can be a permanent adhesive or a release adhesive that permits removal and reapplying or repositioning ofinsole 10 in the footwear. - Alternatively, lower surface 18 a of
cushioning layer 18 can be provided as a high friction surface to maintaininsole 10 in position in the footwear. For example, synthetic rubber adhesive coating (not shown) can be added to lower surface 18 a ofcushioning layer 18 for this purpose. - Accordingly, with
insole 10,cushioning pillows forefoot portion 12 and atheel portion 14 where most of the impact and forces occur during a gait. Further,such insole 10 fits within open style footwear, and will remain in position in such open style footwear during wearing by the user. At the same time, however, the wearer, because of the taper at the peripheral edge thereof, does not feel any edge drop-off, thereby enhancing comfort to the wearer. - Referring now to
FIGS. 7-9 , aleft insole 110 according to a second embodiment of the present invention will now be described. A right insole (not shown) is identical toleft insole 110 and is a mirror image thereof. -
Insole 110 has the same shape asinsole 10 ofFIGS. 1-6 , and therefore includes a curved toe orforefoot portion 112, a heel portion 114, and amid-foot portion 116 which connectsforefoot portion 112 and heel portion 114 together. -
Insole 110 is formed by a generallyplanar cushioning layer 118, having a generally dome shaped,lower pillow 120 extending from the lower surface ofcushioning layer 118 atforefoot portion 112 and a generally dome shaped,lower pillow 122 extending from the lower surface ofcushioning layer 118 at heel portion 114. - In this embodiment,
layer 118 andpillows - Thus,
gel layer 118 andpillows -
Insole 110 can be secured to the open style footwear by using the tack properties of the gel. In this regard, it is preferred that the tack of the gel is enhanced by incorporating a tackifier into the gel composition to increase the friction/tack of the gel surface. Suitable tackifiers include a petroleum hydrocarbon resin sold under the designation I-Mark V by Idemitsu Kosan Co., Ltd. of Tokyo, Japan; the rosin sold under the trademark ASYLVALITE® under designation RE 80 for SEBS gels; and phenolsulfonic acid ester sold under the trademark AMESAMOLL® for a polyurethane (PU) gel. The desired tack is preferably between 120 and 250 grams, as determined by a probe tack tester sold under the trademark APOLYKEN®, at one second contact time. - Preferably, dome shaped
pillows resilient spring walls cushioning layer 118 in a repeating order, extending down from the lower surface oflayer 118 atforefoot portion 112 and heel portion 114. -
Thin spring walls 130 extend substantially in the lengthwise direction ofinsole 110 from the forward end to the rearward end ofpillow 120. The height ofspring walls 130 extends down such thatspring walls 130 located toward the center ofpillow 120 have a greater height thanspring walls 130 located toward the edges ofpillow 120, withspring walls 130 therebetween tapering down, as shown best inFIG. 7 . In this manner, the lower ends ofspring walls 130 inpillow 120 form a substantially dome shape. The overall thicknesses or heights ofcushioning layer 118 andpillows cushioning layer 18 andpillows spring walls 130 at the center of each pillow can reach a height of about 2-3 mm above the uniform layer, and the constant or uniform thickness or height ofcushioning layer 118 can be about 2 mm. - In like manner, thin elastic and
resilient spring walls 132 are formed in a V-shaped pattern inpillow 122 at heel portion 114.Spring walls 132 are formed with the same varying height asspring walls 130. Thus, the heights ofspring walls 132 extend down such thatspring walls 132 located toward the center ofpillow 122 have a greater height thanspring walls 132 located toward the edges ofpillow 122, withspring walls 132 therebetween tapering down. In this manner, the lower ends ofspring walls 132 inpillow 122 form a substantially dome shape. The overall thicknesses or heights ofcushioning layer 118 andpillows cushioning layer 18 andpillows spring walls 132 at the center of each pillow can reach a height of about 2-3 mm, and the constant or uniform thickness or height ofcushioning layer 118 can be about 2 mm. - In the embodiment of
FIGS. 7-9 , thin, spaced apartspring walls thin spring walls spring walls spring walls - As with
cushioning layer 18,cushioning layer 118 preferably tapers in thickness toward the peripheral edge 118 b ofinsole 110 in order to prevent a user from feeling an edge drop-off. For example,cushioning layer 118 can have a uniform thickness of 2 mm which tapers down to a thickness of about 1 mm at the peripheral edge 118 b ofinsole 110. - A top cover layer (not shown), which is the same as
top cover layer 24, can be secured to the upper surface ofcushioning layer 118, although such a top cover layer is not required. - Although the present invention uses the term insole, it will be appreciated that the use of other equivalent or similar terms such as innersole or insert are considered to be synonymous and interchangeable, and thereby covered by the present claimed invention.
- The present invention is also applicable to insoles other than full length insoles, such as heel cushions and ball of foot cushions.
- Further, although the present invention has been discussed in relation to a removable insole, it can be incorporated as a permanent inner sole in footwear, such as a shoe or the like.
- Having described specific preferred embodiments of the invention with reference to the accompanying drawings, it will be appreciated that the present invention is not limited to those precise embodiments and that various changes and modifications can be effected therein by one of ordinary skill in the art without departing from the scope or spirit of the invention as defined by the appended claims.
Claims (16)
Priority Applications (9)
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US10/919,085 US20060026865A1 (en) | 2004-08-06 | 2004-08-16 | Insole |
CA002514139A CA2514139C (en) | 2004-08-06 | 2005-07-29 | Insole |
PCT/US2005/027718 WO2006017652A1 (en) | 2004-08-06 | 2005-08-04 | Insole |
CN201110076925.0A CN102144828B (en) | 2004-08-06 | 2005-08-04 | Insole |
CN200580033322.5A CN101031213B (en) | 2004-08-06 | 2005-08-04 | Insole |
DE602005008315T DE602005008315D1 (en) | 2004-08-06 | 2005-08-05 | insole |
EP05017060A EP1623643B1 (en) | 2004-08-06 | 2005-08-05 | Insole |
MXPA05008399A MXPA05008399A (en) | 2004-08-06 | 2005-08-05 | Insole. |
AT05017060T ATE401806T1 (en) | 2004-08-06 | 2005-08-05 | INSOLE |
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US91290504A | 2004-08-06 | 2004-08-06 | |
US10/919,085 US20060026865A1 (en) | 2004-08-06 | 2004-08-16 | Insole |
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US (1) | US20060026865A1 (en) |
EP (1) | EP1623643B1 (en) |
CN (2) | CN102144828B (en) |
AT (1) | ATE401806T1 (en) |
CA (1) | CA2514139C (en) |
DE (1) | DE602005008315D1 (en) |
MX (1) | MXPA05008399A (en) |
WO (1) | WO2006017652A1 (en) |
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Also Published As
Publication number | Publication date |
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WO2006017652A9 (en) | 2006-04-27 |
CN101031213B (en) | 2011-06-08 |
CN102144828B (en) | 2012-07-04 |
EP1623643A1 (en) | 2006-02-08 |
ATE401806T1 (en) | 2008-08-15 |
MXPA05008399A (en) | 2006-02-09 |
EP1623643B1 (en) | 2008-07-23 |
WO2006017652A1 (en) | 2006-02-16 |
CN101031213A (en) | 2007-09-05 |
DE602005008315D1 (en) | 2008-09-04 |
CA2514139C (en) | 2009-09-22 |
CN102144828A (en) | 2011-08-10 |
CA2514139A1 (en) | 2006-02-06 |
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