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Publication numberUS3925916 A
Publication typeGrant
Publication dateDec 16, 1975
Filing dateAug 22, 1974
Priority dateOct 4, 1973
Also published asDE2400861A1, DE2400861B2, DE2400861C3
Publication numberUS 3925916 A, US 3925916A, US-A-3925916, US3925916 A, US3925916A
InventorsGarbuio Carlo
Original AssigneeGarbuio Carlo
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Foot-fitting insert for ski boot or the like
US 3925916 A
Abstract
A flexible insert for a boot comprises a foot-fitting liner with a core of elastomeric sheet material sandwiched between two skins. At least part of the core is an open-celled foam polymer in an air-impervious envelope, preferably of heat-sealable plastic.
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Description  (OCR text may contain errors)

United States Patent [1 1 Garbuio Dec. 16, 1975 FOOT-FITTING INSERT FOR SKI BOOT OR THE LIKE [76] Inventor: Carlo Garbuio, Volpago del Montello, Treviso, Italy [22] Filed: Aug. 22, 1974 [21] Appl. No.: 499,406

[30] Foreign Application Priority Data Oct. 4, 1973 Italy 29732/73 [52] US. Cl. 36/71 [51] Int. Cl. A43B 19/00 [58] Field of Search 36/25 R, 2.5 AL, 71

[56] References Cited UNITED STATES PATENTS Murray 1. 36/71 Nishimura 36/15 AL Rudy 36/15 AL Primary Examiner-Patrick D. Lawson Attorney, Agent, or FirmKarl F. Ross; Herbert Dubno [57] ABSTRACT A flexible insert for a boot comprises a foot-fitting liner with a core of elastomeric sheet material sandwiched between two skins. At least part of the core is an open-celled foam polymer in an air-impervious envelope, preferably of heat-sealable plastic.

9 Claims, 5 Drawing Figures US. Patent Dec. 16,1975 Sheet10f2 3,925,916

RE IN- IMPREGNATED FABRIC U.S. Patent Dec.16, 1975 Sheet20f2 3,925,916

FABRIC FABRIC v am Ill-"In FOOT-FITTING INSERT FOR SKI BOOT OR TI-IE LIKE FIELD OF THE INVENTION My present invention relates to a foot-fitting insert for a ski boot or the like, adapted to be received in the boot as a permanent or removable liner.

BACKGROUND OF THE INVENTION Liners of this type are especially desirable in the case of integrally molded ski boots which must allow for a certain internal clearance in order to give the foot of the skier the necessary mobility. The inserted liner is thus designed to fill up that clearance without unduly restricting the motion of the foot, serving at the same time as a thermal insulator.

Boot liners are known which comprise a sealed envelope filled with a pasty mass, being displaceable inside the envelope to adapt itself to the shape of the foot. Aside from the high cost of such liners, their effectiveness is limited to certain temperature ranges below which the mass tends to harden and above which it becomes excessively liquid. Such liners are therefore not satisfactory for ski boots which are worn both indoors and outdoors so as to be subject to major temperature variations.

Also not fully satisfactory are liners in which the flowable mass has been replaced by air pockets. Although the usefulness of such a boot insert is not substantially affected by changes in temperature, the air in the pockets tends to yield in the presence of concentrated stress as caused by protrusions on the foot of the user, or possibly on extraneous objects when the insert is to be extracted from the boot to serve as after-ski footwear.

OBJECT OF THE INVENTION It is, therefore, the object of my invention to provide an improved insert of this description which avoids the aforestated disadvantages and can be used as either a permanent or an extractable liner for a ski boot.

SUMMARY OF THE INVENTION I realized this object, in accordance with my present invention, by constructing a foot-fitting liner from flexible sheet material including an elastomeric core sandwiched between two skins, these skins forming an airirnpervious envelope about at least a part of the core which has a multiplicity of interstices filled with air. This enveloped part consists, pursuant to a further feature of my invention, of an open-celled foam polymer such as, for example, polyurethane.

The air-impervious envelope may consist of heatsealable thermoplastic material, either as a self-supporting foil or an an impregnant of a skin-forming fabric layer, to enable all-around closure of the envelope by thermal fusion.

BRIEF DESCRIPTION OF THE DRAWING The above and other features of my invention will now be described in detail with reference to the accompanying drawing in which:

FIG. 1 is a longitudinal sectional view of a ski boot lined with an insert according to my invention;

FIG. 2 is a side-elevational view of the insert of FIG. 1 without the boot;

SPECIFIC DESCRIPTION An integrally molded ski boot 1, FIG. 1, is provided with an insert 2 which may be removable therefrom to serve as an after-ski shoe. Insert 2 is a foot-fitting liner of flexible sheet material with an elastomeric core 4, 4a sandwiched between two skins comprising a pair of fabric layers 3 which may be adhesively bonded thereto. Two major lateral areas A of the insert (one on each side), extending over the region of the ankle, are bounded by a closed seam 7 forming a sealed envelope for the core portion 4a, FIGS. 4 and 5, which consists essentially of an open-celled foam polymer. In FIG. 4 the envelope is formed by two thermoplastic layers 6, e.g. of polyethylene, fusion-bonded to each other along the seam 7 and overlain by the fabric layers 3. FIG. 5 shows the fabric layers 3 themselves impregnated with resin, e.g. a polyester, to form the airtight envelope around the open-celled core portion 4a, the seam 7 being here produced by fusion of the impregnants with omission of the plastic layers 6.

As further shown in FIG. 1, a pair of elastic pads 8 (one on each side) may be juxtaposed with the insert 2 in the region of the ankles for additional protection, the material of these pads being substantially denser than that of the core portion 4a. Pads 8 may consist of the same solid (i.e. nonfoamed) elastomeric material as the core portions 4 surrounding the area A, e.g. polyurethane. Any lateral pressure acting upon this pad will be distributed by the resilient core 4a over the entire area A for effective cushioning of the foot without materially impeding its mobility.

Naturally, other areas or possibly the entire insert could be provided with the highly elastic core 4a sealed within an airtight envelope.

Since the air in the interstices of the core 4a cannot migrate freely within the envelope but can shift only to a limited extent, it will not be completely extruded from a region subjected to localized lateral stress so that continued mechanical as well as thermal protection is assured for the entire foot clad with the insert. This insert, accordingly, can also be worn indoors on the foot without the boot 1.

My improved insert 2 can be produced at greatly reduced cost, compared to the conventional liners referred to above, and can be sealed along the boundary 7 with very little effort. This enables high-rate mass production with conventional equipment.

Although polyurethane has been mentioned as an example of a foamable plastic material of low thermal conductivity and good mechanical stability, both on shelf and in use, other materials in this class can be employed for the same purpose.

I claim:

1. An insert for a boot; comprising a foot-fitting liner of flexible sheet material including an elastomeric core sandwiched between two skins, at least part of said core having a multiplicity of interstices filled with air, said skins including a fabric impregnated with an air-impervious mass to form an airtight envelope about said part.

2. An insert as defined in claim 1 wherein said part consists essentially of an open-celled foam polymer.

3. An insert for a boot, comprising a foot-fitting liner of flexible sheet material including two juxtaposed skins bonded to each other along a plurality of closed seams encompassing separate areas, and an elastomeric core of open-celled foam polymer sandwiched between said skins in each of said areas, said skins forming an air-impervious envelope about each core whereby air in the cells of each core has limited mobility within the envelope but cannot escape therefrom.

4. An insert as defined in claim 3, further comprising a solid elastomeric layer sandwiched between said skins in parts of said liner outside said areas.

5. An insert as defined in claim 3, wherein said areas extend along opposite sides of said liner across the region of the ankle.

6. An insert as defined in claim 5, further comprising a resilient pad on said liner overlying a fraction of each area in the region of the ankle.

7. An insert as defined in claim 3 wherein said skins include a fabric.

8. An insert as defined in claim 7 wherein said fabric is impregnated with an impervious mass along said part.

9. An insert as defined in claim 7 wherein said envelope consists of thermoplastic layers overlain by said fabric.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3693270 *Jan 8, 1971Sep 26, 1972Murray Brian LInternal pads for rubber footwear
US3744159 *Sep 7, 1971Jul 10, 1973Nishimura KSports shoe
US3760056 *Sep 23, 1970Sep 18, 1973Bogert RMethod for custom fitting an inflatable bladder to a wearer{3 s foot
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4182056 *Mar 6, 1978Jan 8, 1980Engineered Sports Products, Inc.Pliable inner boot and injectable fit packs for ski boots
US4385456 *Mar 6, 1981May 31, 1983Jean LivernoisPreformed lining component for skate boots and the like
US4910889 *Oct 26, 1988Mar 27, 1990Salomon, S.A.Ski boot liner
US5149588 *Sep 5, 1989Sep 22, 1992Yamaha CorporationFitting pad for ski boots
US5253435 *Aug 19, 1991Oct 19, 1993Nike, Inc.Pressure-adjustable shoe bladder assembly
US5257470 *Feb 19, 1991Nov 2, 1993Nike, Inc.Shoe bladder system
US5416988 *Apr 23, 1993May 23, 1995Nike, Inc.Customized fit shoe and bladder therefor
US5765298 *Mar 12, 1993Jun 16, 1998Nike, Inc.Athletic shoe with pressurized ankle collar
US5784807 *Sep 18, 1996Jul 28, 1998Pagel; Todd A.Fluid filled support system for footwear
US6044497 *Aug 17, 1998Apr 4, 2000Toasty Toes, L.L.C.Half sock
US6732455 *Jun 26, 2001May 11, 2004Salomon S.A.Comfort upper for footwear
US7370438Dec 1, 2004May 13, 2008The Timberland CompanyRemovable or reversible lining for footwear
US7676959May 9, 2006Mar 16, 2010Mission Itech Hockey, Inc.Contoured skate boot
US7752776 *Jan 16, 2004Jul 13, 2010Gore Enterprise Holdings, Inc.Thermally insulating products for footwear and other apparel
US8215032 *Jul 30, 2010Jul 10, 2012Nike, Inc.Article of footwear having an upper with a structured intermediate layer
US8505216Jul 6, 2012Aug 13, 2013Nike, Inc.Article of footwear having an upper with a structured intermediate layer
US8856968 *Sep 9, 2010Oct 14, 2014PTX Performance Products, Inc.Foot stabilizer socks and stabilizer pads therefor
US8893407Jun 27, 2007Nov 25, 2014Salomon S.A.S.Footwear having a rigid shell
US20030154627 *Feb 19, 2002Aug 21, 2003Shimano Inc.Boot liner
US20040083625 *Jul 9, 2003May 6, 2004Wilder Thomas V.Contoured skate boot
US20040209061 *Jan 16, 2004Oct 21, 2004Brian FarnworthThermally insulating products for footwear and other apparel
US20050175799 *Apr 15, 2005Aug 11, 2005Brian FarnworthThermally insulating products for footwear and other apparel
US20060112595 *Dec 1, 2004Jun 1, 2006The Timberland CompanyRemovable or reversible lining for footwear
US20060201030 *May 9, 2006Sep 14, 2006Wilder Thomas VContoured skate boot
US20060254091 *May 13, 2005Nov 16, 2006Riecke Edgar EBoot fitting aid for alpine ski boots
US20080000109 *Jun 27, 2007Jan 3, 2008Salomon S.A.Footwear having a rigid shell
US20100287790 *Nov 18, 2010Nike, Inc.Article Of Footwear Having An Upper With A Structured Intermediate Layer
US20110119808 *Sep 9, 2010May 26, 2011Sherman Daryl CFoot stabilizer socks and stabilizer pads therefor
US20120192365 *Jan 26, 2012Aug 2, 2012Ottenstein Joseph BExplandable shoe tree for soft shoes
USD280949Apr 1, 1983Oct 15, 1985Kangaroos U.S.A. Inc.Athletic shoe with padded counter
Classifications
U.S. Classification36/71
International ClassificationB32B5/18, A43B5/04
Cooperative ClassificationA43B5/0405, A43B5/04
European ClassificationA43B5/04B, A43B5/04