WO1992008381A1 - Semelle interieure chauffante et son procede - Google Patents

Semelle interieure chauffante et son procede Download PDF

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Publication number
WO1992008381A1
WO1992008381A1 PCT/US1991/008685 US9108685W WO9208381A1 WO 1992008381 A1 WO1992008381 A1 WO 1992008381A1 US 9108685 W US9108685 W US 9108685W WO 9208381 A1 WO9208381 A1 WO 9208381A1
Authority
WO
WIPO (PCT)
Prior art keywords
insole
layer
padding layer
padding
cavity
Prior art date
Application number
PCT/US1991/008685
Other languages
English (en)
Inventor
Robert S. Dahle
Original Assignee
Dahle Robert S
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
Application filed by Dahle Robert S filed Critical Dahle Robert S
Publication of WO1992008381A1 publication Critical patent/WO1992008381A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/02—Footwear with health or hygienic arrangements with heating arrangements 
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F2007/0001—Body part
    • A61F2007/0039—Leg or parts thereof
    • A61F2007/0047—Sole

Definitions

  • This invention relates generally to footwear and, particularly, to apparatus and methods for keeping a person's feet warm when the ambient temperature is considerably less than normal human body temperature. Still more particularly, this invention relates to an insole for use inside boots, shoes, or the like for holding a heat source to provide warmth to the wearer's feet.
  • German Patent No. 3,544,856 to Walter discloses an insole that incorporates a heat dispensing material in a pocket formed in the insole padding.
  • U.S. Patent No. 3,544,856 to Walter discloses an insole that incorporates a heat dispensing material in a pocket formed in the insole padding.
  • the prior art heated insole devices are unsuitable for long-term wear in a shoe, boot, or the like.
  • the problem of cold feet for people engaging in outdoor activities in cold weather remains unsolved by the prior art.
  • SUMMARY OF THE INVENTION The present invention provides an inexpensive solution to the problems of cold feet suffered by individuals who work or participate in outdoor recrea- tional activities in cold weather.
  • the present invention adds no extra weight and is easy and comfortable to use in a shoe or boot.
  • An insole for a boot or the like comprises an upper layer formed of a resilient material and a padding layer having an upper side connected to the upper layer.
  • the padding layer is preferably formed in the general shape of the outline of a human foot to have a toe portion and a heel portion.
  • a section in the toe portion of the padding layer has a reduced thickness, and a pair of ledges are formed on opposite sides of the reduced thickness section.
  • a cover plate is placed over the reduced thickness section. The front and rear edges of the cover plate extend over the ledges so that the cover plate and the reduced thickness portion of the padding layer define an open-sided cavity formed to hold a heat source.
  • the cover plate is preferably formed of a rigid material having a plurality of holes therein to permit the passage of air through the cover plate to the heat source.
  • the cover plate preferably is stitched to the ledges.
  • the reduced thickness section is forward of the ball of a user's foot.
  • the padding layer preferably is formed of a material having flexibility sufficient to relieve shear stress at the connections between the cover plate and the padding layer when the insole flexes in the toe portion.
  • the cover plate preferably is sufficiently rigid to stabilize the heat source and maintain it in a predeter ⁇ mined configuration to assure comfort to the foot of a user.
  • the reduced thickness portion of the padding layer preferably is at least about 12 mm from the toe end of the insole so that the toe end of the insole may be trimmed to adjust the length of the insole.
  • An insole for a boot or the like may also comprise an upper layer of a resilient material and a padding layer having an upper side connected to the upper layer.
  • a stabilizer layer is connected to a lower side of the padding layer.
  • the upper layer, the padding layer, and the stabilizer layer are formed in the general shape of the outline of a human foot to have a toe portion and a heel portion.
  • a cavity is formed in the padding layer so that a heat source may be placed therein.
  • the heat source may be a commercially available device that produces heat from an exothermic chemical reaction.
  • the cavity is preferably located in the toe portion of the padding layer.
  • the upper layer preferably has a plurality of holes therein for facilitating heat transfer from the heat source to the foot of a person using the insole.
  • a pull cord may be connected to the stabilizer layer for facilitating removal of the insole from a boot or the like.
  • Figure 1 is a top plan view of a foot warmer insole according to the present invention.
  • Figure 2 is a side elevational view of the foot warmer insole of Figure 1;
  • Figure 3 is a bottom plan view of the foot warmer insole of Figures 1 and 2;
  • Figure 4 is an elevational view of a second embodiment of an insole according to the present invention showing structure for forming a cavity for containing a heating element;
  • Figure 5 is a partial plan view of the insole of
  • a foot warmer insole 10 according to the present invention includes a heel portion 12, an arch portion 14, and a toe portion 16. It should be noted that none of the drawings are to any particular scale. The relative sizes of the features illustrated are for convenience and clarity of presenta ⁇ tion only.
  • the foot warmer insole 10 includes an upper layer 18 that is preferably formed of a flexible material such as vinyl or the like.
  • the upper layer 18 preferably has a thickness of about 0.05 to 0.10 inch. Any material suitable for making an upper surface of an insole for a boot or shoe may be used to form the upper layer 18.
  • the upper layer 18 has an outline that generally conforms to the shape of a human foot.
  • the foot warmer 10 includes a lower portion 20 that has an outline substan ⁇ tially identical to that of the upper surface 12.
  • the lower portion 20 preferably includes at least a pair of stabilizer sheets 22 and 24.
  • a pull cord 26 may be connected to the inner stabilizer sheet 22 and arranged to pass through the outer stabilizer sheet 24 at a slot 28.
  • the slot 28 may be in any convenient location near the heel portion 12 of the foot warmer insole 10, but is preferably about 0.5 to
  • the foot warmer insole 10 is designed to fit inside a boot or the like.
  • the preferred location of the slot 28 permits the foot warmer insole 10 to be trimmed to fit various boot sizes.
  • the pull cord 26 folds over the upper layer 18 at the heel end so that the free end of the pull cord 26 is easily accessible so that it may be manually grasped to pull the foot warmer insole 10 out of the boot.
  • a padding 30 formed of any suitable material, such as polyurethane foam.
  • a cavity 32 may be formed between the upper layer 18 and the lower portion 20. This cavity 32 preferably begins about
  • the upper layer 18 preferably includes a plurality of holes 33 in the portion that covers the cavity 32.
  • the dimensions of the cavity 32 are exemplary only. The invention is not limited in scope to any of the particular dimensions given herein.
  • the essential characteristic of the cavity 32 is that it have dimensions suitable for receiving a heat source 42 therein.
  • One preferred heat source 42 comprises a mixture of iron powder, water, salt, activated charcoal, and wood fiber in a pouch 44.
  • the pouch 44 is preferably formed of a fabric that retains the material therein while permitting the entrance of air into the pouch 44.
  • the heat source 42 is packaged in an airtight container such as a cellophane envelope (not shown) for storage. When the heat source 42 is removed from the envelope, air passes through the fabric.
  • Exposure of the material inside the pouch 44 to oxygen causes an exothermic chemical reaction to begin.
  • the pouch 44 should be exposed to the air for a brief time to allow the reaction to bring the pouch 44 to a temperature high enough to provide the desired amount of warmth.
  • the rate and duration of the reaction depends upon the amount of air to which the pouch is exposed. Outside the boot, when the pouch is exposed to oxygen, it heats rapidly to about 120°F. Inside a boot where there is only a small amount of oxygen, the heater will maintain a temperature near body temperature for about six hours. Removing the boot from the wearer's foot for a few minutes allows more oxygen to reach the heat generating materials in the pouch 44 and cause the heater to again reach a temperature of about 120°F.
  • the preferred heating element is odorless and produces no harmful fumes.
  • the existing insoles should be removed from the boots or soles.
  • the foot warmer insole 10 should be slightly shorter than the existing insoles to provide ease of removal and insertion. Socks should be worn while using the foot warmer insole 10 to prevent the possibility of excessively warming portions of the user's feet. For best results one thin pair of ski socks or the like should be worn while using the foot warmer insole 10.
  • FIG 4 shows the front portion of a preferred structure for an insole 50 that includes a recess 52 for receiving the heating pouch 44.
  • the insole 50 is preferably an orthotic insole that has sufficient rigidity to permit it to be inserted into a shoe or boot without bending appreciably.
  • the insole 50 is first formed to have an upper layer 54 that may be formed of a vinyl or fabric material.
  • a cushioning layer 58 that preferably comprises a material formed of polyurethane foam or the like is attached to the upper layer 52.
  • the cushioning layer 58 is bonded to the upper layer 54 in a conventional manner.
  • the overall thickness of the front portion of the insole 50 is preferably about 5.0 mm.
  • the recess 52 comprises a central portion 60 and ledges 62 and 64 at the front and rear ends of the central portion 60.
  • the length of the central portion is prefer ⁇ ably about 57 mm.
  • the ledges 62 and 64 extend across the width of the insole 50 and are about 6.25 mm long.
  • the ledge 64 preferably begins about 12 or 13 mm from the front edge 65 of the insole. The distance of the ledge from the end 65 of the insole 50 should be sufficiently large to permit trimming so that the insole 50 may be customized to allow for minor variations in the length of the inside of the boot or shoe with which it is to be used.
  • the ball of the foot bears a large part of the user's weight.
  • the heating element generally does not provide the desired amount of cushioning.
  • the length of the recess 52 must therefore be sufficient to hold the heating element 42 so that it will be flat and forward of the ball of the wearer's foot to avoid interfering with the cushioning at the ball of the foot.
  • the central portion 60 and the ledges 62 and 64 may be formed by compressing the insole.
  • the insole 50 is crushed so that the central portion 60 has a thickness of about 0.5 mm.
  • the thickness of the insole 50 at the ledges 62 and 64 is preferably about 4.5 mm.
  • the process of crushing the insole 50 to form the recess 52 may include applying both heat and pressure to permanently deform the insole where the recess 52 is formed.
  • a cover, plate 68 is placed over the recess 52 and preferably secured by sewing with stitches 76 the edges 72 and 74 to the ledges 62 and 64, respectively.
  • the cover plate 68 may also be secured to the ledges 62 and 64 by an adhesive or by using both an adhesive and stitching.
  • the cover plate 68 preferably has a length of about 69 mm and a thickness of about 0.5 mm. These dimensions of the cover plate allow it to fit on the ledges 62 and 64 without extending above the 5-mm thickness of the insole 50 in front of and behind the ledges 62 and 64.
  • the central portion 60 of the recess 52 accommodates a heating pouch 44 that has a thickness of about 3.5 mm.
  • the cover plate 68 is preferably formed of a material such as polycarbonate.
  • the upper surface 69 of the cover plate 68 is preferably brushed so that it has a velvet finish.
  • the brushed upper surface 69 of the cover plate 58 [SHOUI-D THIS BE 68?] prevents excessive sliding of the user's foot on the toe portion of the insole 50.
  • the cover plate preferably includes a plurality of holes 78 that are about 4.75 mm in diameter.
  • the holes allow adequate oxygen to enter the heat pack.
  • the cover plate is preferably formed of a rigid material such as polycarbonate or the like to stabilize the heat pack and keep it flat while it is inside the recess. If the cover plate is not sufficiently rigid, then the heat pack tends to bunch up under the user's foot and causes discomfort.
  • the cushioning layer 58 is preferably flexible. When the user walks, the insole 52 tends to bend in the toe portion. The flexibility of the cushioning layer 58 allows the insole 52 to bend without causing undesirably large shear stresses at the connections between the cover plate and the ledges 62 and 64.
  • the cushioning material must be sufficiently dense that -the weight of the user does not compress the insole below the heating pack and its cover. Otherwise there might be a bulge that would cause discomfort in the user's toe region.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

Une semelle intérieure (10) pour botte ou analogue comporte une cavité (32) située dans la couche de garnissage (30) et destinée à renfermer une source de chaleur (42) produisant de la chaleur à partir d'une réaction chimique exothermique. Ladite cavité (32) est de préférence située dans la partie des orteils (16) de ladite couche de garnissage (30). La couche supérieure (18) de la semelle intérieure (10) présente de préférence une pluralité de trous (33) destinés à faciliter le transfert de chaleur de ladite source de chaleur (42) vers le pied d'une personne utilisant ladite semelle intérieure (10). Un cordon à tirer (26) peut être relié à la couche stabilisatrice afin de faciliter le retrait de ladite semelle intérieure (10) d'une botte ou analogue.
PCT/US1991/008685 1990-11-20 1991-11-20 Semelle interieure chauffante et son procede WO1992008381A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US615,990 1984-05-31
US61599090A 1990-11-20 1990-11-20

Publications (1)

Publication Number Publication Date
WO1992008381A1 true WO1992008381A1 (fr) 1992-05-29

Family

ID=24467603

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/008685 WO1992008381A1 (fr) 1990-11-20 1991-11-20 Semelle interieure chauffante et son procede

Country Status (2)

Country Link
AU (1) AU9056191A (fr)
WO (1) WO1992008381A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7775204B2 (en) * 2007-01-05 2010-08-17 Long Ho Chen Warming shoe pad

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH122981A (de) * 1926-11-08 1927-10-17 Fritz Schuepbach Als Fusswärmer dienende Schuheinlage.
FR971950A (fr) * 1940-11-07 1951-01-23 Chaufferette pour chaussures et chaussures en comportant application
US2680918A (en) * 1952-08-14 1954-06-15 Edward T Behner Footwear with self-contained heating unit
US3585736A (en) * 1970-04-24 1971-06-22 Jeffery R Polichena Heated boots and shoes
US4249319A (en) * 1980-01-18 1981-02-10 Yoshiyasu Yoshida Heat insulating insert for footwear
DE3544856A1 (de) * 1985-04-24 1986-10-30 Walter, Hans-Peter, 8022 Grünwald Schuheinlegesohle
US4658515A (en) * 1985-02-05 1987-04-21 Oatman Donald S Heat insulating insert for footwear
US4686993A (en) * 1985-07-26 1987-08-18 Paragon Podiatry Laboratories Low profile functional orthotic
WO1987006803A1 (fr) * 1986-05-15 1987-11-19 Konstantin Ledjeff Chaussure

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH122981A (de) * 1926-11-08 1927-10-17 Fritz Schuepbach Als Fusswärmer dienende Schuheinlage.
FR971950A (fr) * 1940-11-07 1951-01-23 Chaufferette pour chaussures et chaussures en comportant application
US2680918A (en) * 1952-08-14 1954-06-15 Edward T Behner Footwear with self-contained heating unit
US3585736A (en) * 1970-04-24 1971-06-22 Jeffery R Polichena Heated boots and shoes
US4249319A (en) * 1980-01-18 1981-02-10 Yoshiyasu Yoshida Heat insulating insert for footwear
US4658515A (en) * 1985-02-05 1987-04-21 Oatman Donald S Heat insulating insert for footwear
DE3544856A1 (de) * 1985-04-24 1986-10-30 Walter, Hans-Peter, 8022 Grünwald Schuheinlegesohle
US4686993A (en) * 1985-07-26 1987-08-18 Paragon Podiatry Laboratories Low profile functional orthotic
WO1987006803A1 (fr) * 1986-05-15 1987-11-19 Konstantin Ledjeff Chaussure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7775204B2 (en) * 2007-01-05 2010-08-17 Long Ho Chen Warming shoe pad

Also Published As

Publication number Publication date
AU9056191A (en) 1992-06-11

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