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Publication numberUS2979835 A
Publication typeGrant
Publication dateApr 18, 1961
Filing dateApr 28, 1958
Priority dateApr 28, 1958
Publication numberUS 2979835 A, US 2979835A, US-A-2979835, US2979835 A, US2979835A
InventorsScholl William M
Original AssigneeScholl William M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Foot cushioning device
US 2979835 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

April 1961 w. M. SCHOLL 2,979,835

FOOT CUSHIONING DEVICE Filed April 28, 1958 frg? 511 E W/ZZ/A/V M SC/VOZZ United States Patent FOOT CUSHIONING DEVICE William M. Scholl, 211-213 w. Schiller St., Chicago, 111.

Filed Apr. 28, 1958, Ser. No. 731,541 g 1 Claim. or. 3644) This invention relates to improvements in a foot cushioning device, and more particularly to a device for disposition in an article of footwear beneath the plantar surface of the foot, the invention being highly desirable for use as a cushion type full or partial insole, although it may take other formsas will be apparent to one skilled in the art. e

In the making of foot cushioning devices heretofore, and particularly foot cushioning devices such as full or partial insoles, difliculty has been experienced in constructing an insole that would lie flatly in an article offootwear such as a shoe, because of the fact that the structural insole of the shoe in mostcases turns upwardly slightly in the marginal portions. Further'difliculty has been experienced in providing foot cushioning devices underlying the forward part of the foot that did not' cramp the toes by occupying too much space in the forward part of a shoeor the like, and thus causing a crowded condition for the toes. Extreme difficulty has also been heretofore experienced in providing a cushion type insole or other footcushioning device that is comparatively extremely thin and yet provides adequate cushioning relief. I

With the foregoing in mind, it is an'important object of the instant invention to provide a foot cushioningfievice so constructed as to lie flatly in the shoe and overlie'the edges of the structural shoe insole and compensate for the upwardly turned margins of that structural insole. p

Also an object of the invention is the provision of ,a foot cushioning device which may be constructed in the form of a cushioning insole, and which comprises a cover layer and an underlayer of cushioning material whiehi is secured to the cover. layer by a marginal seam, the cushioning material being thicker and curving toward .the upper layer inside the relatively thin marginal seam. Also a feature of the instant invention is the provision of a foot cushioning device comprising .a-relatively thin cover layer, a thicker layer of cushioning material joined to the cover layer by a thin marginal scam in the nature ofa lateral flange substantially in the plane of the cover layer, while the underlayer curves tjoward the'cover' layer inside the seam.

a p A further object of the instant inventionisfthe'provision of a foot cushioning device including a relatively thin cover layer. and 'a-thicker underlayer of cushioning materialsecured to the cover. layer by. a marginal seam in which the" cushioning materialtis compressed to i'substantially the thickness of the cover,iand"which se'am gradually widens in the forward portion of the device until it reaches maximum width at the anterior end of v 1 the device, thereby providing ample toe room within the article of footwear.

graduates in width in the forward portion of the device, reaching its maximum width at the anterior end of the device, the cushioning material being compressed in the heat seal seam and the density of the cushioning material in the widest part of theheat seal seam varying from a maximum at the anterior end of the device to a lesser amount in the inner portion of the seam at that end of the device.

Also a feature of the invention is the provision of a foot cushioning device which may preferably be madein the form of an insole, and which embodies a cover layer and a thicker layer of cushioning material, the cushioning material decreasing gradually in thickness in the forward portion thereof to merge with a relatively wide heat seal seam of considerably less thickness than the cushioning layer alone in its body portion. While some of the more salient features, characteristics and advantages of the instant invention have been above point d out, others will become apparent from the following disclosures, taken in conjunction with the accompanying drawing, in which 7 U .Figure'l is a bottom plan yiew of a cushioning insole embodying principles of the instant invention;

Figure 2 is a fragmentary enlarged top plan view of the rear or lefthand end ofthestructure of Fig. 1;

Figure. 3 is an enlarged transverse vertical sectional view taken substantially as indicated by the line III'III of Fig. 1, looking in the direction of the arrows; and

'Figure 4 is a fragmentary enlarged v rtical sectional view taken substantially as indicated by the line IV-IV of Fig. 1.

' As shown on the drawings:

Whi e the instant invention maytake a number of several different forms and sizes as will be apparent to one skilledin the 'art, the invention lends itself quite favorably for use as a cushion insole, and by Way .of illustration, therefore, an embodiment of the invention has been selected for illustration and description herein which is in the form of a cushion type insole of a size to underlie the complete plantar surface ofthe human foot. Also,

in the illustrated instance, the insole'is of the type that is placed freely in an article of footwear on top of the structuralinsole of the footwear. It is to be understood that for;.purpos'es of clarity the invention is-illustratedin Figsr l, 3 and 4 in inverted position. I The illustrated embodiment of the instant invention comprises a relatively thin cover sheet 1 which is preferably a thermoplastic; material such as an unsupported vinyl film.. Preferably the sheet 1 is provided with-numerous perforations 2 as seen clearly in Fig. 2. 1 A she et dot cushioning material is secured to the underface of the cover sheet 1 preferably by a marginal V seam 4, vvhich is. also preferably a heat seal seam. The

- polymer in one or more plasticizers selected from a large Another feature of the instant invention'resides in the provision of a foot cushioning device comprising a cover layer and a thicker layer of cushioning rnaterial joined to the cover layer by a marginal heat seal seam which cushion sheet 3-,is considerablythicker thanthe cover s heetland is alsoipreferably atherrnoplastic material, a chemical foam such as;vinyl foam being ,highly satisfactbry for lthe purpose. a one satisfactory example of aycushioning material which may readily beheat sealed is vinyl team made ifrom'fa liquid composition generically ,known as ajplas;

9 -1 T1 P i li li -sx mlsd p a y sa inift-tgas d th n u d; in h e pandeshcqnditidn to" provideaflightweight structural material which is highly flexible, resilient, and possesses intercommunicat- 1 ing cells. The plastisol may satisfactorily be a disper-,

sion or suspension of polyvinyl chloride resin, or a co number of high boiling esters, for example, such as dioctyl phthalate, dioctyl adipate, dicapryl phthalat'e, etc.

Such materiaL'yvhen compared with a material such as foam latex, is more shock absorbing, more resistanttofoot during use.

'The cover -1 maybe of'the, same material, insofaras chemical constituents are concerned, as the cushion layer :3, 'but'in the instance of the cover no expansion of the ingredients is caused, but they may be chargeddirectly into a Banbury mill and then passed between calender -rolls,- whioh"results in a very much thinner and denser product, commonly referred to as a'film. V The cushion layer '3, if a'foam, has' intercommunicating-cells, whereby during use air willbe pumped into and out of, as well as through the cushion layer. This, coupled with the apertures 2 in the cover sheet '1, provides adequate ventilation for both the device'and'the The two layers or sheets 1 and 3 are preferably heat sealed together at the bounding margin only, remaining unsecured to eachother in'the intermediate region where- -by wrinkling of thedevic'e orpermanent creasing thereof during use is avoided. The heat scaling is preferably accomplished with suitable dies by way of a high frequency electronic process. -'-With the instant invention,

one of those dies is preferably so shaped and constructed 5.:

as to provide a graduated eflect in the region of theheat seal searn. 'With reference to FiglB, it may thus be's'een .that this-effect causes'a curving of the marginal portion .ofthe cushion 'sheet 3 toward the cover sheet 1, as indicate'd'at *5. In the actual seam, the cushion material is compressed and held compressed to substantially the same thickness as the cover sheet, as indicated at 6 in Fig. 3. Thus a thin and narrow heat seal seam 4- is provided which is in the nature'of a lateral flange substantially in the plane of the cover sheet. Thus, when thefinished device is placed in a shoe or the like, the curvate margin-50f the cushion sheet 3 compensates for the upward curvature of the marginal portion of the structural insole in the shoe, while the heat seal seam 4 which is elevated above the underface of the cushion sheet 3 ove'rlies the edge of the structural insole. Accordingly, the instant invention lies flatly in'a shoe and presents a flat upper surface to the foot of aus'er, adequately compensating for thedeviation from flatness in ordinary shoe construcon the device, itwill'yield to any protuberance or excrescence of. the foot and adequately cushion the foot throughout-the entire surface ofcontact." 7

' .l. Another important feature of thje instant' invention is best-shown in Figs. 1 and 4." That'is the factthat" the the seamreaching its widest part 7 at'the anterior end of c 7 .tion; LAt' thesarne time, when thebody weightisplaced the. device." The-widening of that seam'in theanterior portion-of the device of course results in the decrease in ythicliness of the cushion sheet in that'region so as to provide adequate toe room for the user, and not cause a crowded condition within: the toe portion i o'f the shoe.

- 1 '-As seen best in Fig.4,as the-heat seal seamis widened *in' the region '7, the cushion layer 3 gradually increases' in thickness, toward the inner portion o f' the seanu and i V gtherebythe seam a variation indensity, being denser ;(pages-106 l08, 2l45216inc1.).

4 at the outer forward edge than it is at the inner part of the wide portion of the seam. This causes a gradual lessening in the cushioning characteristic of the device toward the ends of the toes, with no abrupt change in character present.

For the purpose of aiding'in the provision of ample toe room in the shoe and also to provide the lessening of cushion effect towardthe tips of the'toes, another structural feature is incorporated in the instant invention. This feature resides in the gradual decrease in thickness of the cushion layer in the forward portion thereof, as indicated by numeral 8in Figs. .1 and 4. In the illustrated instance, this gradual decrease in thickness occurs from substantially the dotted line 9 shown in Fig. 1. While the decrease in thickness of the cushion sheet 3 may be molded into the sheet 3 if the same is molded, it is preferable to slice the sheet 3 from a thick piece of stock, and provide the decrease in thicknessby a skiving action during the slicing operation.

lt'will be noted that ample toe room is provided in a shoewhen the decrease in thickness at 8 of the cushion sheet -3 is coupledfwith the widened seam portion 7, and yet the fullcushioning effect of the sheet 3 is maintained throughout the greater portion of the 'device.

From the foregoing, it will be apparent that I have provided asimple form of foot cushioning device which 'dition in ordinary articles of, footwear, and which allows ample-toe room at'all times. Further, the device may be made in-any color, is extremely clean in appearance, may be laundered at will, is not adversely affected by foot acids, detergents, and the like, resists fungus, bacteria and the like, and is extremely light in weight.

It will be understood that modifications and variations may be effected without departing from the scope of the 'novel concepts of the present invention. 5

I claim as my invention:

A heat sealedflat cushion insolefor free disposition in an article'of footwear, comprising a relatively thin flat vinyl cover sheet for disposal; against the foot of the wearer and a relatively thick fiat vinyl foam, pad coextensivewith said sheetand secured thereto by'a heat seal seam alongthe'bounding edges only of said sheet and pad, saidpadhaving a curvate-inargin along thelower surfaceonly thereof compressed to the'same'thickness as the cover sheet with the marginal edges of said sheet and pad'b'eing' relatively flatfthe heat seal seam substantially in the" vicinity of the'metatarsal'heads being substantially wider and the curvate margin of'the pad being of greater density andlesser thickness along the outer forward 'edge anddecreasing infdensity and increasing in thickness a controlled distance rearwardlyfrom said for;

warded ge. V I v i V a f- ReferencesCited in the tile ofthis patent; h 'JUNITED STATES ar-ants Modem Plastic Periodical, vol. 32, November 1954

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2088707 *Aug 12, 1935Aug 3, 1937Frederick T KingFoot arch support
US2585692 *Sep 1, 1949Feb 12, 1952William M SchollCushioning and corrective insole
US2658288 *Jul 28, 1951Nov 10, 1953Scholl William MMolded and tapering latex insole for footwear
US2783553 *May 3, 1955Mar 5, 1957William M SchollInsole with longitudinal arch flange
US2917842 *Sep 12, 1956Dec 22, 1959William M SchollFoot cushioning devices
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3063458 *Oct 4, 1960Nov 13, 1962William M SchollFoot cushioning and supporting sandal
US3109245 *Apr 6, 1962Nov 5, 1963Robert P GlyanWeighted insole
US3130753 *Apr 26, 1962Apr 28, 1964Aeroquip CorpFloating swimming pool hose
US3143812 *Sep 22, 1961Aug 11, 1964Scholl Mfg Co IncInsoles for footwear
US3170178 *Jun 22, 1962Feb 23, 1965William M SchollMethod of making a foot cushioning insole
US3170250 *May 11, 1964Feb 23, 1965Scholl William MFoot cushioning device
US3211814 *Nov 6, 1961Oct 12, 1965Us Rubber CoMethod of making plastic boat
US3233348 *Dec 6, 1961Feb 8, 1966Francis M GilkersonLaminated insole
US3236926 *Aug 23, 1962Feb 22, 1966American Biltrite Rubber CoProcess of making resilient elastomeric floor coverings
US3360422 *Oct 19, 1965Dec 26, 1967Armstrong Cork CoReinforced cellular floor covering
US3390762 *May 22, 1967Jul 2, 1968Canadian IndMethod of winding thermoplastic resin sheeting into rolls and rolls obtained thereby
US3448533 *Jan 18, 1968Jun 10, 1969Beckwith Arden IncCushion insole
US3457659 *Mar 14, 1968Jul 29, 1969Coleman NathanResilient innersole
US4617745 *Mar 8, 1985Oct 21, 1986Batra Vijay KAir shoe
US5025575 *Oct 27, 1989Jun 25, 1991Nikola LakicInflatable sole lining for shoes and boots
US5329705 *Feb 16, 1993Jul 19, 1994Royce Medical CompanyFootgear with pressure relief zones
US5746011 *Jul 17, 1997May 5, 1998Ortolab AbOrthopedic insole and method of its manufacture
US6000147 *Jul 17, 1998Dec 14, 1999KellermanThree section orthotic device
US7299568 *Sep 15, 2004Nov 27, 2007Tager Steven EOrthopedic foot devices
US7992323 *Aug 30, 2006Aug 9, 2011Chung-Jen LinStructure of ventilating insole
US8106320 *Apr 23, 2008Jan 31, 2012Polymatech Co., Ltd.Decorative sheet, decorative molded body, decorative key sheet, and decorative sheet manufacturing method
US9333106Nov 30, 2011May 10, 2016Ossur HfCircumferential walker
US9468553Jul 7, 2015Oct 18, 2016Ossur HfCircumferential walker
US9492301Jul 26, 2013Nov 15, 2016Ossur HfCircumferential walker
US9668907Apr 25, 2016Jun 6, 2017Ossur Iceland EhfOrthopedic device
US20060053664 *Sep 15, 2004Mar 16, 2006Tager Steven EOrthopedic foot devices
US20070074424 *Aug 30, 2006Apr 5, 2007Chung-Jen LinStructure of ventilating insole
US20080268202 *Apr 23, 2008Oct 30, 2008Polymatech Co., Ltd.Decorative sheet, decorative molded body, decorative key sheet, and decorative sheet manufacturing method
US20140338220 *Dec 10, 2012Nov 20, 2014Footjacks LtdFootwear/insole for footwear
USD772418Sep 17, 2015Nov 22, 2016Ossur HfShell for an orthopedic device
USD776288Sep 17, 2015Jan 10, 2017Ossur HfShell for an orthopedic device
USD776289Sep 17, 2015Jan 10, 2017Ossur HfShell for an orthopedic device
WO1990010396A1 *Mar 13, 1990Sep 20, 1990Nikola LakicInflatable sole lining with pressure control
Classifications
U.S. Classification36/44, 36/147, 36/174, 36/3.00B
International ClassificationA43B17/00, A43B17/02
Cooperative ClassificationA43B17/02
European ClassificationA43B17/02