US2245706A

US2245706A - Manufacture of strap sandals

Info

Publication number: US2245706A
Application number: US295115A
Authority: US
Inventors: William H Nutt
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1939-09-15
Filing date: 1939-09-15
Publication date: 1941-06-17
Anticipated expiration: 1958-06-17

Description

June 17, 1941. w, -r 2,245,706

MANUFACTURE OF STRAP SANDALS Filed Sept. 15, 1939 Patented June 17, 1941 UNETED STATES PATENT QFFIQE MANUFAQ'JTURE F STRAP SANDALS William H. Nutt, Beverly, Mass, assignor to United Shoe Machinery Corporation, Borough of Flemington, N. .L, a corporation of New Jersey Application September 15, 1939, Serial No. 295,115

(Cl. l2146) 12 Claims.

sole, an outsole, and an upper consisting of a v plurality of crossstraps, the ,end portions of which are inturned between the marginal portions of the soles, the inturned end portions of the straps tend to produce undesirable ridges or irregularities of surface contour either in the tread face of the outsole or in the foot-facing surface of the insole. It has been proposed to obviate this difficulty by removing material from the marginal portion of the insole in spaced localities to provide strap-receiving recesses in which the end ..1

portions of the straps may be disposed in substantially flush relation to the unrecessed portions of the insole surface. The results thus obtained, however, have not been entirely satisfactory inasmuch as the insoles have been weakened where the material has been removed and difficulty has been experienced in obtaining a secure and permanent attachment of the straps to the insole.

It is one object of the present invention to provide strap-receiving recesses in an insole without weakening the insole and to this end, as herein shown, I provide an insole of readily compressible but substantially inelastic material and, by compressing and compacting relatively narrow portions spaced from one another along the margin at one side of the insole, I provide a plurality of strap-receiving recesses in the insole while leaving the portions of the insole where the recesses are formed at least as strong as the rest of the insole. While the recesses may be made each of a depth corresponding to the thickness of the straps, it may be found desirable, as herein illustrated, to make each recess of a depth somewhat less than the thickness of the straps and to compensate for the difference between the thickness of the straps and the depth of the recesses by securing members in the nature of filler pieces to the marginal surface of the insole in the locations between the recesses. As illustrated, these filler pieces may constitute tabs or wings formed as marginal projections upon a covering applied to the foot-facing side of the insole. In making the insole, after the covering has been applied, the tabs will be folded over the edge and the recessed side of the insole and after being secured in place, as by means of cement or otherwise, the tabs W111 function to cover the edge of the insole in the spaces between the straps, as well as to compensate for the additional thickness of the straps and to provide for more secure attachment of the outsole to the shoe bottom in the localities between the straps.

Invention is also to be recognized as residing in the improvements in insoles and sandals hereinafter described and claimed.

The invention will be explained with reference to the accompanying drawing, in which Fig. 1 is a perspective view of an insole embodying features of my invention;

Fig. 2 is a sectional View of the insole taken in a plane indicated by the line II-II of Fig. 1, illustrating the operation of forming the strap-receiving recesses or depressions therein;

Fig. 3 is a View, partially in section in the same plane as Fig. 2, and partially in perspective, of the insole;

Fig. 4 is a perspective view of my improved strap sandal in process of manufacture; and

Fig. 5 is a view, partially in perspective and partially in cross-section, of the completed sandal.

As illustrated in the drawing, my improved insole is prepared by having formed therein a plurality of marginal strap-receiving recesses ill, the recesses being formed or molded while the insole is in a flat condition by compressing or compacting the insole material where the recesses are to be located. The locations of the recesses will vary in accordance with the style of the sandal in which the insole is to be used, the illustrated insole having the recesses formed only in its fore-' part. However, if straps are to be employed in the shank or in the shank and heel portions of the sandal, the strap-receiving recesses will be formed in these portions of the insole. To facilitate proper shaping of the recesses and to insure that the shape and depth of the recesses shall be permanently retained, it is preferred to provide an insole composed of readily compressible and substantially inelastic material, such, for example, as a composition of wood pulp and latex, or

other fabricated or so-called manufactured insole material of the sort commonly employed as a substitute for sole leather.

The molding of the recesses in the insole may conveniently be accomplished, a illustrated in Fig. 2, by placing the insole upon a table or support M (which may be the bed or platen of a press), positioning molding dies or presser members it upon the marginal portion of the insole in the localities where the recesses are to be formed, the die being shaped to form recesses corresponding in width tothe width of the straps to be used in the sandal, and forcing the dies toward the table or platen by means of a vertically movable pressure applying member it. In thi way a plurality of recesses or depressions is may be made simultaneously by single pressure applying operation. The depth of the recesses it will be gauged with reference to the thickne of the sandal straps if desired, the depth of the recesses may be made to correspond to the thickness of the straps so that after the end portions of the straps have been received and secured within the recesses the exposed surfaoes oi these strap portions will be iiush with the adjacent portions of that surface of the insole which is to race the outsole. However, as herein illustrated, the recesses or depressions iii may be made of less depth than the thickness of the straps, and members 23 in the nature oi filler pieces may be secured to the recessed side of the insole in the localities between the recesses, the thickness of the filler pieces being such that the distance from the bottoms of the recesses to the exposed faces of the filler pieces will be substantially equal to the thickness of the straps and thus, when the strap are received in the recesses, the exposed surfaces of the traps will be flush with the exposed surfaces of the filler pieces so that a bottom surface free of depressions or ridges is provided for the attachment of'the outsole. Preferably, the filler pieces it: are formed a integral extensions of a covering 22 which is applied to the footiacing side of the insole. This covering 22, which may consist of kid or other soft upper leather and which is intended to take the place of the usual sock lining, is cut so as entirely to cover the foot side of the insole. The filler piece extensions or tabs 25 are folded over the edge and overlapped upon the recessed side of the insole, the tabs as well as the body portion of the covering being preferably secured to the insole by means of cement. The covering 22, with the tabs 223, may be applied to the insole after the strapreceiving recesses have been formed therein, in which event the locations of the recesses may be determined by the use of suitable patterns and the locations marked in any appropriate manner upon the insole. As herein illustrated, however, the covering 22 is applied before the recesses are formed in the insole. Thus, the tabs 2t serve to gage the locations of therecesses in the insole, the spaces between the tabs indicating where the dies it are to be positioned in order that the recesses ill shall be properly located to receive the straps. If no recesses are to be formed in the shank and heel portions of the insole, the covering 22 may be shaped, as shown,

to provide suiiicient surplu marginal material to.

be folded over the edge and to overlap the outsole-facing side of the insole so as to constitute an edge binding 24 for the insole in the heel and shank portion thereof. Advantageously, the covering 22 may be cut out by means oi a die, the die being so shaped that the tabs 28 will be properly located relatively to the recesses Iii or to the localities where the recesses are to be formed. It will noted that the portions of the tabs 26 which overlie the edge of the insole in the localities between the recesses it serve as edge covering or binding means for the insole in these localities. The edge portions of the insole which are uncovered between the tabs 28 will be covered by means of the straps themselves so that in the completed shoe the insole will have no unfinished edge portions exposed to view.

In the manufacture of a sandal embodying the above-described insole, the insole is positioned uponthe bottom of a last 26 (Fig. 4) and secured thereon as by means of tacks 28. A forepart upper assembly comprising a plurality of crossstraps at is placed upon the last and the individual straps are successively tensioned around the last and their end portions laid in the respective recesses iii in the insole and secured in place therein as by mean of cement and/or suitable fastenings. A illustrated, curved wire staples 32 are employed as the fastening means, the staples being embedded in the compressed and consolidated insole material beneath the recesses Ill without penetrating the surface at the foot side of the insole. Thus, the points oi the staple legs will not enter or penetrate the covering 22 and consequently they will not cause discomfort to the foot nor will they be visible in the interior of the shoe bottom. The operation of securing the strap Within the insole recesses by means of curved staples may conveniently be performed by the use of a staple side lasting machine, such as that disclosed in United States Letters Patent No. 1,815,295., granted July 21, 1931, upon application of George Goddu. Inasmuch as the pertions of the insole immediately beneath the ends of the straps have been compressed or consolidated in the process of forming the recesses, these portions have not been weakened (as would be the case if material had been removed from the insole in the process of forming the recesses) and consequently these portions of the insole will be even stronger than, or at least as strong as, the unrecessed portions thereof. Consequently, the staples will be securely anchored within the insole material and the straps will be firmly and eifectively secured in place so that they will not be liable to become loosened or detached from the insole during the wearing of the shoe. After the end portions of the straps have been secured in place within the recesses, a above described, any surplus strap material extending inwardly beyond the recesses will be trimmed away and a'suitable filler piece 34 may be applied to fill the shoe bottom cavity within the trimmed ends of the straps. As shown, a heel part or quarter 36 (which may be a premolded heel part) is assembled with the other parts of the shoe upon the last and the bottom margin of the heel part is secured in overlasted position upon the insole as by means of tacks 38. A suitable shank stiffener as may be secured to the insole.

The shoe botto'm'is then prepared for the ce= men't attachment of an outsole by roughing the exposed surfaces of the inturned end portions of the straps 30, the bottom margin of the back part 36, the tabs 20, and the margins 24 of the covering 22, after which these roughened sur faces are coated with pyroxylin cement. An outsole 42 is prepared in the usual way with a roughened margin at its attaching side and this margin is coated with pyroxylin cement. The cement coatings on the shoe bottom and on the outsole are permitted to dry and just before the outsole is to be attached the dried coatings are activated by means of a suitable solvent and the outsole is attached by the use of a cement sole attaching press in a well-lmown manner.

In the finished shoe, inasmuch as the outer surfaces of the overlasted end portions of the upper straps are flush with the outer surfaces of the tabs 20, there 'will be no undesirable ridges or irregularities either in the outsole or the insole where the straps are inturned between the soles. The straps will be much more securely anchored to the insole than has been the case heretofore where the strap have been attached to portions of the insole that have been decidedly weakened by the removal of material therefrom in the process of forming the strap-receiving recesses. In the present construction, on the other hand, the insole material is in no way weakened but is actually strengthened by compressing and consolidating the insole material resulting from the forming of the recesses in the insole by pressure applying operations. The straps, being secured, as herein illustrated, by means of fastenings to these consolidated portions of the insole, are anchored in such a way as to preclude any risk of becoming loosened or separated from the insole during the life of the shoe. Moreover, due to the presence of the tabs between the inner and outer soles in the localities between the straps and the fact that these tabs are formed as integral extensions of the covering on the foot side of the insole, a far more satisfactory bonding of the outsole to the shoe bottom may be obtained in the cement attaching of the outsole than if the outsole were attached directly to the insole between the straps. This is particularly true in cases where the insole is made of the customary manufactured leather substitute material, since while the surface of such material may become firmly cemented to the outsole the fibers or laminations of the insole material will separate rather easily, allowing the outsole to become loose. In addition, the tabs 20 constitute coverings for the edge of the insole where the insole is exposed to View in the localities between the straps.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. That improvement in methods of making insoles for strap sandals which consists in pro viding an insole of readily compressible and substantially inelastic material, and simultaneously compacting a plurality of relatively narrow portions spaced from one another along the margin of the insole, thereby compacting and consolidating the insole material in said portions and providing in one side of the insole, a plurality of marginal strap-receiving recesses without weakening the insole in the vicinity of the recesses.

2. That improvement in methods of making insoles for strap sandals which consists in providing an insole covering having a body portion of insole size and shape and having a plurality of tabs spaced from one another along the margin of said body portion, securing the body portion of said covering to one side of an insole, folding said tabs over the edge and the opposite side of said insole and securing said tabs to the insole, and forming marginal strap-receiving recesses in said insole in the localities between said tabs.

3. That improvement in methods of making insoles for strap sandals which consists in providing an insole of readily compressible and substantially inelastic material forming an insole covering having a body portion of insole size and shape and having a plurality of tabs spaced from one another along the margin of said body portion, securing the body portion of said covering to one side of said insole, folding said tabs over the edge and the opposite side of said insole and securing the tabs to the insole and compressing the marginal portions of the insole in the plurality of marginal strap-receiving depressions in the'insole without weakening the depressed portions thereof.

4. That improvement in methods of making insoles for strap sandals which consists in forming a sock lining of insole size and shape having a plurality of tabs spaced from one another along its margin, applying said sock lining to an insole so as to cover one side only of the insole, and folding said tabs only over the edge face and the opposite side of said insole and securing said tabs in place, thereby defining marginal recesses in the edge face and in one side of the insole for receiving the end portions of sandal straps.

5. That improvement in methods of making insoles for strap sandals which consists in forming a sock lining of insole size and shape having a plurality of tabs spaced from one another along the margin of it forepart and having a marginal extension in its shank and heel portions, applying said lining to an insole so as to cover one side of the insole, folding said tabs and said exlocalities between said tabs, thereby providing a tension over the edge and overlapping them upon the opposit side of said insole and securing them to the insole, and forming marginal strap-receiving recesses in said insole in the localities between said tabs.

6. That improvement in methods of makin insoles for strap sandals which consists in forming a sock lining of insole size and shape having a plurality of tabs spaced apart substantial distances from one another along the margin of said lining and applying said lining to an insole so as to cover one side of the insole, folding said tabs over the edge and opposite side of said insole and securing them to the insole, and compressing the marginal portion of the insole simultaneously in the localities between said tabs thereby forming in the insole a plurality of strapreceiving depressions in said localities without weakening the depressed portions of the insole.

7. For use in making strap sandals, an insole having in one side a plurality of marginal strapreceiving recesses and having marginal portions between said recesses which are thicker than the unrecessed portions of the insole, the material in the portions of the insole where said recesses are formed being compressed and consolidated to a substantial extent relatively to the material in the rest of the insole.

8. For use in making strap sandals, an insole having in one side a plurality of marginal recesses for receiving the end portions of sandal straps, and a sock lining secured to and covering the opposite side of saidinsole, and a plurality of tabs spaced apart along the margin of said sock lining, said tabs covering the edge and the recessed side of said insole in localities between said recesses.

9. For use in making strap sandals, an insole, a sock lining comprising a portion coextensive with and secured to one side only of the insole, and a plurality of tabs formed integrally with said portion, said tabs being spaced apart alon the edge of the latter and being overlapped upon the edge face and inturned upon the opposite side of the insole thereby forming strap-receiving recesses between adjacent tabs at the edge and at the uncovered side of the insole.

10. A strap sand-a1 comprising an insole, a covering secured to the foot side of the insole, a plurality of tabs spaced apart along the edge of said covering, said tabs being secured in overlapped positions upon the opposite surface of the insole, a plurality of straps having end portions secured in overlasted positions upon the insole, in localities between said tabs, and an outsole attached to said strap portions and to said tabs.

11. A strap sandal comprising an insole having in its outsole-facing side a plurality of marginal strap-receiving depressions and having the material in the portions of the insole Where said depressions are formed compressed and consolidated to a substantial extent relatively to the material in the rest of the insole, a plurality of straps having end portions the thickness of which is greater than the depth of said depressions received in overlasted positions in said depressions, fastening devices securing said strap portions to the insole, said devices extending into said compressed and consolidated portions of the insole but not penetrating the surface at the foot-facing side of the insole, an outsole of uniform edge thickness attached to said strap portions, and

filler pieces secured to the outsole facing side of the insole and located only in the localities between said depressions, said pieces filling the marginal spaces between said soles in the localities between said straps.

12. A strap sandal comprising an insole having a plurality of marginal depressions spaced substantial distances apart in its outsole-facing side, a plurality of upper straps having inturned end portions received within said depressions and secured to the insole, a sock lining covering the foot side of the insole and having spaced marginal tabs secured in inturned overlapping positions upon the outsole-facing side of the insole, said tabs being disposed only in localities between said depressions, and an outsole secured by means of adhesive to said strap portions and to said tabs.

- WILLIAM H. NUT'I.