CA1106595A - Shaped foot support for shoes - Google Patents
Shaped foot support for shoesInfo
- Publication number
- CA1106595A CA1106595A CA311,240A CA311240A CA1106595A CA 1106595 A CA1106595 A CA 1106595A CA 311240 A CA311240 A CA 311240A CA 1106595 A CA1106595 A CA 1106595A
- Authority
- CA
- Canada
- Prior art keywords
- support
- polyolefin
- foam polyolefin
- elasticity
- foam
- 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
Links
Classifications
-
- 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
- A43B17/14—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined made of sponge, rubber, or plastic materials
Landscapes
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Laminated Bodies (AREA)
Abstract
ABSTRACT
A shaped foot support for shoes to be included in the shoe during manufacture or introduced into the shoe after manufacture consisting of a closed-cell, cross-linked foam polyolefin piece having a surface structure adapted to the human foot with zones of different elasticities distributed over the surface merging smoothly into one another. The foam polyolefin has low elasticity in regions of relatively high orthopaedic loading with lower elasticity in regions of comparatively lower loading. The density of the polyolefin which varies inversely as the elasticity is within the range of 0.07 to l kg/dm3 and an insole,suitably of a fibrous material of natural or synthetic fibres bonded together,may be attached to the foam polyolefin piece. The surface of the foam polyolefin may include a surface lining.
The polyolefin may be polyethylene.
A shaped foot support for shoes to be included in the shoe during manufacture or introduced into the shoe after manufacture consisting of a closed-cell, cross-linked foam polyolefin piece having a surface structure adapted to the human foot with zones of different elasticities distributed over the surface merging smoothly into one another. The foam polyolefin has low elasticity in regions of relatively high orthopaedic loading with lower elasticity in regions of comparatively lower loading. The density of the polyolefin which varies inversely as the elasticity is within the range of 0.07 to l kg/dm3 and an insole,suitably of a fibrous material of natural or synthetic fibres bonded together,may be attached to the foam polyolefin piece. The surface of the foam polyolefin may include a surface lining.
The polyolefin may be polyethylene.
Description
S~5 S~ped Support Insert for Shoes -The invention concerns a shaped shoe part or foot and arch support consisting of a closed-cell, cross-linked foam polyolefin with a surface structure adapted and conforming to the human foot and with zones of different elasticities.
German Gebrauchsmuster 76 27 371 discloses a support of this type with orthopaedic properties. In order to give this support ~ones of different elasticities, it has been necessary to bond individual partsof foam plastic together. This results in a~rupt transitions between zones of different elasticity, and manufacture has proved unduly expensive.
One object of this invention is to develop a shaped shoe part as a foot and arch support for incluslon during manufacture oE the shoe or for insertion into the finished shoe, which will have excellent orthopaedic prop-erties and at the same time can be manufactured~in a comparatively simple manner.
~ore particularly in accordance with the invention there is provided, a shaped foot support for shoes comprising, a closed-cell cross-linked foam polyolefin with a surface structure adapted to the underside of the human foot and having zones of different elasticities, the foam polyolefin being structured as one piece and the ~ones of different elasticities being distributed over the surface and merging smoothly into one another. The foam polyolefin may have lower elasticity in regions of relatively high orthopaedic loading and vice versa. The elasticlty of the foam polyolefin may vary 1nversely as its density with the elasticity rising as the density falls. Preferably, the density varies within the range of 0.07 to 1 kg/dm . More preferably, the range may be 0.1 to 0.4 kg/dm . The foam polyolefin may have an insole -attached to it which may be of a fibrous material of natural or synthetic fibres united with a bondiny agent. The foam polyolefin may be provided with a surface lining.
-1- ~ , The new shaped shoe part can particularly advantageously be produced by a combined heat and pressure treatment from a homogeneously structured blank of foam plastic of predetermined climensions. The process of shaping is determined substantially by the mutual overlapping of the different zones of compressibility, or elasticity, of the foam plastic piece. At the same time, the elasticity can be influenced by the intentional introduction of material in chosen regions of the article.
The accompanying drawing illustrates a specific embodimen~ of ;
the new shaped shoe part 1 by way of example.
The different zones of the ar-ticle are illustrated in the drawins by specifying their densities, but it should be understood that the boundaries between the different zones merge continuously into each other, so that the article forms one monolithic piece. It is evident that in the new shoe part the foot is supported principally in the -regions of the heel 2 and of the ball 3 of the foot, where the denslties are highest and the elasticity is least tthe elasticity varying inversely as the density). ~t the same time, however, the new shoe part has the remainder of its upper surface in contact with the under side of the foot, exerting differing elasticity or softness over the foot and arch region ~ depending on the anatomical relationships to the support. By supporting the foot in the boundary zones 5, a distinct improvement in overall foot support is achieved, and chaffing or similar effects that have hitherto been common can be avoided. The invented shoe part is distinguished by an exceptionally low overall weight and by complete physiological acceptability. It shows no chemical aging phenomena and does not interfere with the normal dissipation of perspiration.
~ By including a surface lining on the shaped shoe insert,not ; only can its external appearance be improved, but also its elastic behaviour. Generally, both the upper and the lower sides can be lined, and,mechanically speaking, a sandwich structure is thus produced.
German Gebrauchsmuster 76 27 371 discloses a support of this type with orthopaedic properties. In order to give this support ~ones of different elasticities, it has been necessary to bond individual partsof foam plastic together. This results in a~rupt transitions between zones of different elasticity, and manufacture has proved unduly expensive.
One object of this invention is to develop a shaped shoe part as a foot and arch support for incluslon during manufacture oE the shoe or for insertion into the finished shoe, which will have excellent orthopaedic prop-erties and at the same time can be manufactured~in a comparatively simple manner.
~ore particularly in accordance with the invention there is provided, a shaped foot support for shoes comprising, a closed-cell cross-linked foam polyolefin with a surface structure adapted to the underside of the human foot and having zones of different elasticities, the foam polyolefin being structured as one piece and the ~ones of different elasticities being distributed over the surface and merging smoothly into one another. The foam polyolefin may have lower elasticity in regions of relatively high orthopaedic loading and vice versa. The elasticlty of the foam polyolefin may vary 1nversely as its density with the elasticity rising as the density falls. Preferably, the density varies within the range of 0.07 to 1 kg/dm . More preferably, the range may be 0.1 to 0.4 kg/dm . The foam polyolefin may have an insole -attached to it which may be of a fibrous material of natural or synthetic fibres united with a bondiny agent. The foam polyolefin may be provided with a surface lining.
-1- ~ , The new shaped shoe part can particularly advantageously be produced by a combined heat and pressure treatment from a homogeneously structured blank of foam plastic of predetermined climensions. The process of shaping is determined substantially by the mutual overlapping of the different zones of compressibility, or elasticity, of the foam plastic piece. At the same time, the elasticity can be influenced by the intentional introduction of material in chosen regions of the article.
The accompanying drawing illustrates a specific embodimen~ of ;
the new shaped shoe part 1 by way of example.
The different zones of the ar-ticle are illustrated in the drawins by specifying their densities, but it should be understood that the boundaries between the different zones merge continuously into each other, so that the article forms one monolithic piece. It is evident that in the new shoe part the foot is supported principally in the -regions of the heel 2 and of the ball 3 of the foot, where the denslties are highest and the elasticity is least tthe elasticity varying inversely as the density). ~t the same time, however, the new shoe part has the remainder of its upper surface in contact with the under side of the foot, exerting differing elasticity or softness over the foot and arch region ~ depending on the anatomical relationships to the support. By supporting the foot in the boundary zones 5, a distinct improvement in overall foot support is achieved, and chaffing or similar effects that have hitherto been common can be avoided. The invented shoe part is distinguished by an exceptionally low overall weight and by complete physiological acceptability. It shows no chemical aging phenomena and does not interfere with the normal dissipation of perspiration.
~ By including a surface lining on the shaped shoe insert,not ; only can its external appearance be improved, but also its elastic behaviour. Generally, both the upper and the lower sides can be lined, and,mechanically speaking, a sandwich structure is thus produced.
-2-~t6595 ~' :
.~' For example, for sports shoes, a particularly good overall stability can be achieved ~y such sandwich structuring, without the necassity of having to accept any appreciable worsening of the support characteristics by comparison with unlined shaped shoe par-ts. It is possible, and in many cases, expedient, to line the underside of the foam piece directly with an insole of normal construction. In fashion styled shoes, the use of a fibrous material of natural or synthetic fibres united with a bonding agent has proved excellent as such an insole.
The following example illustrates a process of manufacture of a new insert:
A flat sheet of a closed cell foamed crosslinked polyethylene with a density of 0.9 kp/dm and with a thiokness of 10 mm had a leather fiber material containing a binder and of a thickness of 1 mm Elame-adhered to its underside. A blank was stamped from this sheet material with the ~;
outer contours conforming to a pre-determined shape for a foot support for shoes and was exposed both above and below for three minutes to an infrared surface heat~r at a distance of 30 cm. The foam and the leather-fiber ~
material were brought by this treatment to a semi-plastic condition which ~;; extended into the central zone of the bIank. ;
The heated blank was then placed in the lower part of a cooled metal-forming tool or press which immediately shaped the upper surface of the blank to the desired finished form for the foot support which was retained after cooling.
~n accordance with the anatomical shape of the human foot,~the ~ ~`
finished support had a thickness varying between 2 and 11 mm such that the greatest density of the support was in the region of the heel and the ball of the foot. The density of the support was greatest in the areas of least ; thickness where it had the greatest load capaclty and least relative elasticity. The article was immediately ready for use.
While the support is, .in gen~ral, made from a uniform sheet, it ~ `
`
: : ~ ` . ` " ', , . ~.
~6~i~S :
may, in some instances, be desirable to subject the blank to a milling process in certain areas for reducing ~he amount of material present in those areas, for instance, in the region of the heel and the ball of the foot~ This allows the finished article to accommodate to extremes of orthopedic requirements as well as to allow the realization of particular effects dictated by fashion styling. It is of particular advantage that the bearing properties of the support can be modified by the thermoplastic flow which occurs during forming, or by the above-mentioned milling pre-treatment so that the mechanical pre-treatment need only be relatively rough while still producing a very accurately formed and dimensioned final product. While the milling proce~s allows the removal of thermoplastic in areas where it is desired, it is also possible to add or inject additional thermoplastic material in the regions where additional density of material may be required over and above that achieved simply by the flow-forming which occurs in the shapiny tool.
.~' For example, for sports shoes, a particularly good overall stability can be achieved ~y such sandwich structuring, without the necassity of having to accept any appreciable worsening of the support characteristics by comparison with unlined shaped shoe par-ts. It is possible, and in many cases, expedient, to line the underside of the foam piece directly with an insole of normal construction. In fashion styled shoes, the use of a fibrous material of natural or synthetic fibres united with a bonding agent has proved excellent as such an insole.
The following example illustrates a process of manufacture of a new insert:
A flat sheet of a closed cell foamed crosslinked polyethylene with a density of 0.9 kp/dm and with a thiokness of 10 mm had a leather fiber material containing a binder and of a thickness of 1 mm Elame-adhered to its underside. A blank was stamped from this sheet material with the ~;
outer contours conforming to a pre-determined shape for a foot support for shoes and was exposed both above and below for three minutes to an infrared surface heat~r at a distance of 30 cm. The foam and the leather-fiber ~
material were brought by this treatment to a semi-plastic condition which ~;; extended into the central zone of the bIank. ;
The heated blank was then placed in the lower part of a cooled metal-forming tool or press which immediately shaped the upper surface of the blank to the desired finished form for the foot support which was retained after cooling.
~n accordance with the anatomical shape of the human foot,~the ~ ~`
finished support had a thickness varying between 2 and 11 mm such that the greatest density of the support was in the region of the heel and the ball of the foot. The density of the support was greatest in the areas of least ; thickness where it had the greatest load capaclty and least relative elasticity. The article was immediately ready for use.
While the support is, .in gen~ral, made from a uniform sheet, it ~ `
`
: : ~ ` . ` " ', , . ~.
~6~i~S :
may, in some instances, be desirable to subject the blank to a milling process in certain areas for reducing ~he amount of material present in those areas, for instance, in the region of the heel and the ball of the foot~ This allows the finished article to accommodate to extremes of orthopedic requirements as well as to allow the realization of particular effects dictated by fashion styling. It is of particular advantage that the bearing properties of the support can be modified by the thermoplastic flow which occurs during forming, or by the above-mentioned milling pre-treatment so that the mechanical pre-treatment need only be relatively rough while still producing a very accurately formed and dimensioned final product. While the milling proce~s allows the removal of thermoplastic in areas where it is desired, it is also possible to add or inject additional thermoplastic material in the regions where additional density of material may be required over and above that achieved simply by the flow-forming which occurs in the shapiny tool.
Claims (9)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A shaped foot support for shoes comprising a closed-cell cross-linked foam polyolefin with a surface structure adapted to the underside of the human foot and having zones of different elasticities, the foam polyolefin being structured as one piece, and the zones of different elasticities being distributed over the surface and merging smoothly into one another.
2. A support as defined in claim 1, the foam polyolefin in regions of relatively high orthopaedic loading having lower elasticity than in regions of comparatively lower loading.
3. A support as defined in claim 2, the elasticity of the foam polyolefin being a function of its density, the elasticity increasing with decreasing density.
4. A support as defined in claim 3, the density varying within the range of 0.07 to 1 kg/dm3.
5. A support as defined in claim 3, the density varying within the range of 0.1 to 0.4 kg/dm3.
6. A support as defined in claim 1, 2 or 5, further comprising an insole attached to the foam polyolefin.
7. A support as defined in claim 1, 2 or 5 further comprising a surface lining to said foam polyolefin.
8. A support as defined in claim 1, 2 or 5, comprising an insole of a fibrous material united with a bonding agent attached to the foam polyolefin.
9. A support as defined in claim 1, 2 or 5, the polyolefin being polyethylene.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2742162 | 1977-09-20 | ||
| DEP2742162.1 | 1977-09-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1106595A true CA1106595A (en) | 1981-08-11 |
Family
ID=6019348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA311,240A Expired CA1106595A (en) | 1977-09-20 | 1978-09-13 | Shaped foot support for shoes |
Country Status (10)
| Country | Link |
|---|---|
| AT (1) | AT364695B (en) |
| CA (1) | CA1106595A (en) |
| CH (1) | CH630788A5 (en) |
| DK (1) | DK415278A (en) |
| ES (1) | ES471902A1 (en) |
| FR (1) | FR2403038A1 (en) |
| GB (1) | GB2011243B (en) |
| IT (1) | IT1105459B (en) |
| NO (1) | NO141973C (en) |
| SE (1) | SE437607B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2939731C2 (en) * | 1979-10-01 | 1985-12-19 | Walter Dr.med. 6600 Saarbrücken Hort | Sports shoes, in particular running shoes |
| DE3011847A1 (en) * | 1980-03-27 | 1981-10-01 | Fa. Carl Freudenberg, 6940 Weinheim | WEDGE |
| DE3114105C2 (en) * | 1981-04-08 | 1986-07-24 | Fa. Carl Freudenberg, 6940 Weinheim | Process for the production of a relief-like profiled outsole made of foamed ethylene vinyl acetate copolymer (EVA) |
| FR2511851A1 (en) * | 1981-09-02 | 1983-03-04 | Loic David | Partially compressible loose shoe insole - of expanded polyolefin sheet of varying density or stiffness |
| FR2522482B1 (en) * | 1982-01-15 | 1985-11-15 | Adidas Chaussures | MIDSOLE AND FOOTWEAR COMPRISING SUCH A MIDSOLE |
| FR2625655B2 (en) * | 1982-07-23 | 1991-06-28 | Loic David | REMOVABLE INNER SOLE |
| FR2530429B1 (en) * | 1982-07-23 | 1985-06-14 | Loic David | REMOVABLE INNER SOLE |
| FR2553636B1 (en) * | 1983-10-21 | 1986-04-25 | Adidas Chaussures | MIDSOLE AND FOOTWEAR COMPRISING SUCH A MIDSOLE |
| US4689898A (en) * | 1985-09-11 | 1987-09-01 | Fahey Brian W | Running shoe |
| DE3802035A1 (en) * | 1988-01-25 | 1989-08-10 | Reichenecker Hans Storopack | DAMPING OR UPHOLSTERY BODY FOR USE IN SHOES |
| FR2644044A1 (en) * | 1989-03-08 | 1990-09-14 | Recticel Sa | Inner bootee for a sports shoe and method for manufacturing such a bootee |
| FR2677230A1 (en) * | 1991-06-07 | 1992-12-11 | Ind Shoes Prod Associated | Insole (inner sole) for shoe sole |
| GB2358121A (en) * | 2000-01-11 | 2001-07-18 | Barry R G Corp | Foam insole having areas of different density |
| AUPR999702A0 (en) * | 2002-01-16 | 2002-02-07 | Foot Steps Orthotics Pty Limited | Orthotic insert and method of manufacture thereof |
| AU2003201205B2 (en) * | 2002-01-16 | 2007-09-13 | Foot Steps Orthotics Pty Limited | Orthotic insert and method of manufacture thereof |
| JP2007516109A (en) | 2003-10-14 | 2007-06-21 | アムフィット・インコーポレイテッド | How to take a solid contour mold and maintain it |
| IT1397659B1 (en) * | 2009-07-15 | 2013-01-18 | Tecnica Spa | FOOTWEAR INSOLE AND SOLE STRUCTURE FOR FOOTWEAR INCORPORATING THE INSOLE. |
| US9554616B2 (en) | 2011-10-27 | 2017-01-31 | Nike, Inc. | Dual-density insole with a molded geometry |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE882052C (en) * | 1949-11-01 | 1953-07-06 | Herbert Lindemann | Shoe sole |
| CH321316A (en) * | 1952-12-20 | 1957-04-30 | C Knellwolf Hans | Foot pad for footwear, such as soles, insoles, built-in parts or insoles |
-
1978
- 1978-07-19 NO NO782489A patent/NO141973C/en unknown
- 1978-07-20 ES ES471902A patent/ES471902A1/en not_active Expired
- 1978-07-21 CH CH788078A patent/CH630788A5/en not_active IP Right Cessation
- 1978-08-17 IT IT50762/78A patent/IT1105459B/en active
- 1978-09-11 FR FR7826044A patent/FR2403038A1/en active Granted
- 1978-09-13 CA CA311,240A patent/CA1106595A/en not_active Expired
- 1978-09-18 GB GB7837103A patent/GB2011243B/en not_active Expired
- 1978-09-19 AT AT0675778A patent/AT364695B/en not_active IP Right Cessation
- 1978-09-19 SE SE7809818A patent/SE437607B/en not_active IP Right Cessation
- 1978-09-19 DK DK415278A patent/DK415278A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NO141973C (en) | 1980-06-11 |
| GB2011243B (en) | 1982-01-20 |
| GB2011243A (en) | 1979-07-11 |
| SE437607B (en) | 1985-03-11 |
| FR2403038B1 (en) | 1984-11-30 |
| DK415278A (en) | 1979-03-21 |
| ES471902A1 (en) | 1979-02-16 |
| IT1105459B (en) | 1985-11-04 |
| ATA675778A (en) | 1981-04-15 |
| CH630788A5 (en) | 1982-07-15 |
| NO782489L (en) | 1979-03-21 |
| SE7809818L (en) | 1979-03-21 |
| AT364695B (en) | 1981-11-10 |
| NO141973B (en) | 1980-03-03 |
| IT7850762A0 (en) | 1978-08-17 |
| FR2403038A1 (en) | 1979-04-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |