US3593437A - Heel for footwear - Google Patents

Heel for footwear Download PDF

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Publication number
US3593437A
US3593437A US855314A US3593437DA US3593437A US 3593437 A US3593437 A US 3593437A US 855314 A US855314 A US 855314A US 3593437D A US3593437D A US 3593437DA US 3593437 A US3593437 A US 3593437A
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United States
Prior art keywords
heel
insert
outer layer
rigid
heel according
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.)
Expired - Lifetime
Application number
US855314A
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English (en)
Inventor
Herbert Kogert
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Semperit AG Holding
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Semperit AG Holding
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Filing date
Publication date
Application filed by Semperit AG Holding filed Critical Semperit AG Holding
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Publication of US3593437A publication Critical patent/US3593437A/en
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    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B21/00—Heels; Top-pieces or top-lifts
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B21/00—Heels; Top-pieces or top-lifts
    • A43B21/02—Heels; Top-pieces or top-lifts characterised by the material
    • A43B21/20—Heels; Top-pieces or top-lifts characterised by the material plastics
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/34—Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core

Definitions

  • the outer layer which are particularly useful for footwear are dis- [52] [1.8. CI closed.
  • the heels and soles of this invention exhibit several f Cl A43b21/20 desirable properties including their lightweightness, good Fleld of Search A, wear resistance as we as being readily adhered to the hoe 4 material.
  • the insert is preferably made from a rigid polyu- [56] Reerences cued rethane foam although a rigid polyether or polyester foam UNITED STATES PATENTS may also be employed.
  • the outer layer preferably consists of a 1,710,378 4/1929 Owen 36/34 (A) semirigid, closed-cell foamed polyurethane.
  • the invention relates to a heel for footwear, consisting of an insert and an outer layer.
  • Heels produced according to the prior art methods possess various disadvantages. For example, where the heel is made of a lightweight material, the addition of an insert results in a much heavier heel. As a result, the shoe becomes more clumsy for the user. In addition, the insert does not impart sufficient strengthening (i.e., wear resistance) properties and the insert does not adequately adhere to the shoe material.
  • a still further object of this invention is to provide a lightweight heel which is not easily deformed, and exhibits excellent wear resistance properties.
  • Still another object of this invention is to provide a heel with all the preceding advantages which is capable of being readily supplied and produced at a low cost.
  • the heel of the present invention comprises an insert and an outer layer.
  • the insert is made of a rigid foam while the outer layer consists of a semirigid, closed-cell foamed polyurethane.
  • FIG. 1 is an elevational view of a heel constructed in accordance with the present invention
  • FIG. 2 is a plan view of the heel shown in FIG. 1, FIG. 2 presenting clearly the shape of an insert which may be satisfactorily employed in a heel in accordance with this invention;
  • FIG. 3 is a. preferred embodiment of the heel shown in FIG. 1, and shows the use of a number of 'blocks as the insert;
  • FIG. 4 is a plan view of they heel shown in FIG. 3, FIG. 4 presentingclearly theribs formed'between the blocks;
  • FIG. '5 is an elevational view of a heel wherein the insert possesses asloped-off part in its rear section;
  • FIG. 6- is.an elevational view of a heel of a womans shoe.
  • an insert comprising a number of blocks may be arranged in a heel.
  • a heel is illustrated with a number of blocks, 5, 6 and 7, which are arranged in such a manner that ribs 8 and 9 are formed from the material employed as the outer layer 3.
  • the presence of these ribs in the heel results in a heel possessing a high degree of adhesion between its insert and its outer layer.
  • a heel can be produced according to a preferred embodiment of this invention whereby the outer layer 3 is not detached from inserts 5, 6 and 7 when subjected to extreme stresses.
  • an insert can be employed wherein the insert has a sloped-off part or section 11 in its rear section, as illustrated in FIG. 5.
  • the material flowing into the mould via injection channel 12 is only slightly deflected and thus, the mould can be sufficiently filled.
  • a heel l3 ofa woman's shoe as illustrated in FIG. 6 in which the insert 14 is high and narrow and is made of a rigid polyurethane foam which is similar to the shape of heel 13.
  • the high degree of wear-resistance of the heels and soles of this invention is achieved by employing an outer layer which consists essentially of a semirigid, closed-cell foamed polyurethane.
  • the polyurethane employed in the outer layer is formed by reacting a polyester with an isocyanate. Best results are obtained when the polyester is formed by reacting adipic acid together with ethylene glycol. Particularly good results can also be obtained by employing a mixed ester, e.g., an ester of l,4-butanediol and 1,2-propylene glycol or the like.
  • a preferred isocyanate which may be employed in producing a polyurethane suitable for the outer layer of a heel and/or sole is diphenylmethane 4,4'-diisocyanate.
  • diphenylmethane 4,4'-diisocyanate is diphenylmethane 4,4'-diisocyanate.
  • the polyurethane may be produced by the so-called one-shot process, or according to the prepolymer process.
  • the isocyanate is initially mixed with a part of the polyester in a separately controlled process stage in order to produce a defined prepolymer.
  • a hardener which contains the cross linking agents, activators, catalysts, pore regulators, pigments, etc., is subsequently added to theprepo'lymer in order to form the required polyurethane.
  • a heel or soling material having a cellular structure must meet the following requirements: high strength and impact strength, high cut resistance, high prolonged cold bending strength, high bearing strength, if possible low specific weight, and if possible high proportion of closed cells, a closed surface (skin) of a certain minimum thickness and low abrasion, i.e., high resistance to wear and tear.
  • Such a semirigid, flexible polyurethane foam can be produced according to one of the following examples:
  • the resulting prepolymer has an apparent NCO content of [0.12 and is reacted with a mixture of 4.250 parts butanediol 1,4 0.200 parts triethylenediamine 1.025 parts silicon oil 0.900 parts of a carbon black batch (25 percent) in dioctylphthalate 0.200 parts water 3.005 parts of a fluorized hydrocarbon having a boiling point of 28 C.
  • the reaction takes place at 45 C. and will result in a polyurethane foam having a density of 0.6.
  • the article may be demolded after 5 minutes after the mixing time.
  • a prepolymer A which has an NCO content of 18.8. This prepolymer is brought together in a mixing unit comprising a stirrer rotating at high speed (IO-48.000 r.p.m.) with a second reactive component B at about 40 C., and containing:
  • the mixture of the two components A and B is poured in the desired amount into an open mold of the required heel shape, on the cover of which the required heel insert has been fixed at the inside.
  • the mold is quickly closed, whereupon the reaction components are allowed to foam up and cure for 6 minutes in the mold. After that time, the heel is demolded and the outer layer of the heel has a den sity of 0.55.
  • Rigid polyurethane foam possesses the following strength values:
  • the rigid foam which is employed as the insert is therefore employed in order for the heel to be kept as light as possible without sacrificing the form and stressing properties of the sole which must be maintained at its maximum.
  • a rigid foam possessing a high volumetric weight as well as a smaller cross section than the heel itself is employed as an insert in order to obtain a heel possessing a high degree of wear resistance.
  • the insert is also possible for the insert to be made from a moulded foam.
  • the inner walls of the mould used in the production of the inserts are covered with a permanent separating medium or the inner wall of the mould may consist of a material which does not stick to the rigid foam. Suitable examples of materials which do not stick to the rigid foam include polytetrafluorethylene, silicon rubber, and the like.
  • the underside of the insert can also be roughened prior to the application of the outer layer or the underside can be treated with an adhesive agent.
  • the semirigid polyurethane foam raw mixture which comes into contact with a rough rigid polyurethane foam surface for example, adheres well to this surface.
  • An outer layer can also be applied to a rigid polyurethane foam with two-component polyurethaneadhesive mixtures.
  • the wall thickness of the outer layer should be at least 5 percent (preferably approximately 10 percent) of the width of the heel, and in the case of womens stiletto heels correspondingly more.
  • a heel for footwear comprising an insert and an outer layer, said insert consisting essentially of a rigid foam and said outer layer consisting essentially of a semirigid, closed-cell foamed polyurethane.
  • said outer layer is a semirigid polyurethane, produced by reacting a polyester wim an isocyanate, said polyester being formed by the reaction of adipic acid with ethylene glycol.
  • a heel according to claim 2 wherein the semirigid polyurethane of the outer layer is formed by reacting a mixed ester with an isocyanate, said mixed ester being formed by the reaction of adipic acid with a mixture of l,4-butanediol and 1,2- propyleneglycol.
  • a heel according to claim 8 wherein said insert has a density of between about 50 and about 200 Kg/m 10. A heel according to claim 9, wherein said insert has a density of about 100 Kg/cm.
  • a heel according to claim 2, wherein the semirigid polyurethane of the outer layer has substantially the following properties:
  • a heel according to claim 1 wherein said outer layer has a wall thickness of at least 5 percent of the width of said heel.
  • a heel for footwear comprising a rigid insert formed only of plastic material and an outer semirigid layer, said rigid insert consisting essentially of a rigid foam and said outer layer consisting essentially of a semirigid, c losed-cel] foamed polyurethane, said heel being devoid of any additional inserts beyond said rigid foam insert.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
US855314A 1968-09-05 1969-09-04 Heel for footwear Expired - Lifetime US3593437A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT861168A AT296082B (de) 1968-09-05 1968-09-05 Absatz für Schuhe

Publications (1)

Publication Number Publication Date
US3593437A true US3593437A (en) 1971-07-20

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ID=3607017

Family Applications (1)

Application Number Title Priority Date Filing Date
US855314A Expired - Lifetime US3593437A (en) 1968-09-05 1969-09-04 Heel for footwear

Country Status (8)

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US (1) US3593437A (enrdf_load_stackoverflow)
AT (1) AT296082B (enrdf_load_stackoverflow)
BE (1) BE738505A (enrdf_load_stackoverflow)
CH (1) CH494547A (enrdf_load_stackoverflow)
DE (1) DE1944722A1 (enrdf_load_stackoverflow)
FR (1) FR2017441A1 (enrdf_load_stackoverflow)
GB (1) GB1229344A (enrdf_load_stackoverflow)
NL (1) NL6913094A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4246706A (en) * 1979-05-21 1981-01-27 Persons Jr Seth G Reinforcing pad for athletic shoes
US4876805A (en) * 1988-04-29 1989-10-31 Polymer Dynamics Technology, Inc. Shock absorbing device for high heel footwear
WO1995015355A1 (en) * 1993-11-30 1995-06-08 Imperial Chemical Industries Plc Process for rigid polyurethane foams
US6258864B1 (en) 1999-01-20 2001-07-10 Cabot Corporation Polymer foam containing chemically modified carbonaceous filler
US6586501B1 (en) 1999-01-20 2003-07-01 Cabot Corporation Aggregates having attached polymer groups and polymer foams

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148695B (en) * 1983-10-28 1986-10-15 Cornwell Components Manufactur Sole and heel units
DE3907807C2 (de) * 1989-03-10 1996-05-30 Karl Siebert Absatz für Schuhwerk
DE9013878U1 (de) * 1990-10-05 1992-02-06 Kunststoffverarbeitung Wilhelm GmbH, 6785 Münchweiler Schuhsohle mit Absatz
DE9201107U1 (de) * 1992-01-30 1992-07-02 Fusaro, Ingeborg, 8000 München Schuhabsatz, auftrittsgedämpft, modisch erhöht für Damen- und Herren-Schuhwerk, in Stöckelform oder konischer Keilform
TR200804626A2 (tr) * 2008-06-24 2009-11-23 Sebata Alyasan Kundura İmalat Ti̇caret Ve Sanayi̇ Li̇mi̇ted Şi̇rketi̇ Poliüeratan türevli ayakkabı ökçesi ve üretim yöntemi.
ATE555679T1 (de) * 2008-07-11 2012-05-15 Stanislas Rio Schuh mit hohem absatz und verfahren zur herstellung eines hohen absatzes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1710378A (en) * 1928-07-26 1929-04-23 William A Owen Composite heel
US2729618A (en) * 1952-11-18 1956-01-03 Bayer Ag Isocyanate-modified polyesters reacted with glycols
FR1138027A (fr) * 1955-12-07 1957-06-06 Perfectionnement à la fabrication des talons de chaussures
US3188302A (en) * 1959-01-30 1965-06-08 Du Pont Diamine cured fluid polyether urethane compositions
US3258861A (en) * 1962-07-31 1966-07-05 United Shoe Machinery Corp Polyurethane footwear heels
FR1527793A (fr) * 1967-01-25 1968-06-07 Chaussure pour éviter la fatigue

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1710378A (en) * 1928-07-26 1929-04-23 William A Owen Composite heel
US2729618A (en) * 1952-11-18 1956-01-03 Bayer Ag Isocyanate-modified polyesters reacted with glycols
FR1138027A (fr) * 1955-12-07 1957-06-06 Perfectionnement à la fabrication des talons de chaussures
US3188302A (en) * 1959-01-30 1965-06-08 Du Pont Diamine cured fluid polyether urethane compositions
US3258861A (en) * 1962-07-31 1966-07-05 United Shoe Machinery Corp Polyurethane footwear heels
FR1527793A (fr) * 1967-01-25 1968-06-07 Chaussure pour éviter la fatigue

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4246706A (en) * 1979-05-21 1981-01-27 Persons Jr Seth G Reinforcing pad for athletic shoes
US4876805A (en) * 1988-04-29 1989-10-31 Polymer Dynamics Technology, Inc. Shock absorbing device for high heel footwear
WO1995015355A1 (en) * 1993-11-30 1995-06-08 Imperial Chemical Industries Plc Process for rigid polyurethane foams
US6258864B1 (en) 1999-01-20 2001-07-10 Cabot Corporation Polymer foam containing chemically modified carbonaceous filler
US6586501B1 (en) 1999-01-20 2003-07-01 Cabot Corporation Aggregates having attached polymer groups and polymer foams

Also Published As

Publication number Publication date
DE1944722A1 (de) 1970-03-12
GB1229344A (enrdf_load_stackoverflow) 1971-04-21
NL6913094A (enrdf_load_stackoverflow) 1970-03-09
BE738505A (enrdf_load_stackoverflow) 1970-02-16
CH494547A (de) 1970-08-15
AT296082B (de) 1972-01-25
FR2017441A1 (enrdf_load_stackoverflow) 1970-05-22

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