US2115810A - Cemented shoe construction - Google Patents

Description

y 1938. H. B. 'GORMAN CEMENTED SHOE CONSTRUCTION Filed March 6, -1935 15 IN QENT R I kfm'qw,nliufz w figgw I Patented May 3, 1938 UNITED STATES PATENT orFicE 1 OEMENTED SHOE CONSTRUCTION Application March 6, 1935, Serial No. 9,601

2 Claims.

This invention relates to the manufacture of cemented shoes, and more particularly to the manner of bonding the outsole of such a shoe to the upper. T

A general object of the invention is to provide an improved cemented shoe structure wherein any tendency of the outsole to peel away from the upper is circumvented.

A further object is to provide an improved outsole for cement attachment to a lasted upper.

Another object is to provide a method of preventing the outsole of a cemented shoe from peeling away from its upper.

Yet another object is to provide a cemented shoe having a stronger, more permanent bond between the outsole and upper.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comp-rises the several steps and the relation of one or more of such steps with respect to each of the others, and the article possessing the features, properties, and the relation of elements, which are exemplified in the following detailed disclosure, and the scope of the application of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention reference should be had to the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 is a perspective view of an outsole embodying the principles of the present invention; and

Fig. 2 is a fragmentary transverse sectional view across the forepart of a shoe to which the outsole of Fig. 1 has been attached.

In the manufacture of cemented shoes the outsole is united to the bottom of the lasted upper 40 by means of cement which is usually pyroxylin cement but may be of any other suitable kind. Pyroxylin cement forms a firm tenacious bond between the shoe parts which cannot be pulled apart by a direct pressure acting more or less perpendicularly to the plane of the bond. However, in some cases where the extension edge of cemented shoes is subjected to severe downward knocking or scuffing, there may ensue a peeling action which peels the outsole away from 50 the upper to which it is cemented. That is, the cemented bond may sometimes be peeled or split apart where it could not ordinarily be directly pulled apart. In accordance with the present invention, this peeling separation of the outsole from the upper is circumvented by deflecting or fore available that even "coarse inferior grades of leather such as belly leather, may be used with improved tenacity between the shoe parts, al-

though a'superior joint is assuredwhen leathers of the commonly employed quality are used. The outsole I0 is rounded to any desired 5126,3116. is given any of the usual desired operations prior to cement afiixing it to the upper, such as shanking it out and roughing its marginal portion to which cement is to be applied.

Inaccordance with the present invention, the sole is provided with a channelor incision I I which extends around a marginal portionthereof and runs downwardly into the sole stock from its flesh side. The primary function of this channel is to weaken the sole so that its edge portion may flex downwardly away from its body portionso as to alter the effective direction of a force applied downwardly against the top edge of the sole after it is cemented to the shoe. This will be more apparent upon considering the shoe structure illustrated in Fig. 2, which comprises an insole I2 to which an upper I3 is overlasted in the conventional McKay relationship except that its overlasted allowance M is preferably attached to the insole by cement indicated at I5. However, the particular method of lasting the upper and insole makes no essential difference with respect to the principles of the present invention, so long as the outsole ultimately is cement bonded to the lasted upper. In the form. of shoe particularly illustrated in Fig. 2, a filler I 6 is applied between the inturned edges of the lasting allowance and the outsole III is affixed thereto by a layer of cement I1, preferably pyroxylin cement, which is located between the marginal portion of the sole and the inturned lasting allowance.

Channel II is extended downwardly and inwardly into the sole stock to a depth which is preferably at least half the thickness of such stock, or at any rate to such a depth that it facilitates downward flexure of the edge of the sole with respect to its central body portion. Some of the cement I'I seeps into channel I I and serves normally to hold it closed.

However, the cement within channel H does not hold this channel closed with the same tenacity as the main body of cement holds the outsole to the upper. That is, when a force such as that indicated at F is applied to the edge of outsole, such edge flexes downwardly, opening the channel ll. Once this channel pulls open, the force F, which tended to peel the bond at H, becomes applicable to such bond along a component indicated at F. When the channel II is downwardly and inwardly directed, it will be seen that the force F must be transmitted around the thin flexed stock at l8 to a vicinity located within the point I9 where the channel H meets the flesh surface of the sole. In other words, the peeling effect of force F is altered to the direct pulling effect of force F because of the opening of the gap at H. In practice, the opening I!) of the channel is located about 5-2 of an inch inwardly from the outermost boundary 2!] of the cemented area, so that the peeling action exerted by force F can only continue for this F3 of an inch, after which the channel pul s open and further exertion of the force must act directly downwardly against the adhesion of cement ll. This effectively circumvents continued peeling of the sole away from the upper which would render the shoe unfit for wear, and substitutes a relatively harmless local flexure of the edge portion of the sole. This edge portion is adaptedto move back into position as soon as the force at F is removed.

The channel H may be extended around any desired marginal part of the outsole, being shown in Fig. l as extending around the forepart thereof, which is the preferred form. However, it may be extended along the shank and even into the heel portions if desired. This channel may be applied at any suitable time during the manufacture of the outsole, either before or after any of the usual operations, such as shanking, roughing, cementing, etc., and it may be made in any suitable manner, as for example by means of conventional channeling machines having a special knife, or having a conventional knife adjusted to the required angle. As explained, the channel preferably extends downwardly and inwardly in order to transfer the effect of downward scuffing forces to an area located well within point l9 at which the peeling action stops. However, it is contemplated that this channel my extend in any desired direction so long as the edge portion of the sole is weakened so as to permit downward flexure thereof in a manner which circumvents or retards a peeling separation of the outsole and upper.

It will be appreciated that in the drawing, the size and relationship of the parts has been exaggerated better to show the described non-peeling action.

It will be seen that in accordance with the present invention, kicking and scufling forces applied to the edge of the outsole of a cemented shoe cannot be effective to peel or pry the sole away from the upper and that a stronger and more permanent attachment between these shoe parts is assured.

Since certain changes in carrying out the above method, and certain modifications in the article which embody the invention may be made without departing from its scope, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

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

1. A cemented shoe comprising an upper and an outsole, cement attaching said sole to said upper, said sole having a channel extending marginally around the forepart thereof, said channel opening into the flesh or upper surface of said outsole along a line located only slightly within the outer boundary of said cement, and continuing downwardly and inwardly into said sole whereby the extended edge of said sole at the forepart is integrally attached to the remainder thereof at points located inwardly beyond the outer margin of said cemented area, said channel forming a weakened line around the forepart margin of the sole so .that said extended edge is held against the body of the sole with less tenacity than the sole is held against the shoe upper whereby downward forces applied to said extended edge may permit said channel to open to assure transmission of such forces to said cemented area through said inwardly located integral attachment. 7

2. A method of preventing the outsole of a cemented shoe from peeling from the upper, which comprises weakening such outsole along a margi nal line near the outer boundary of the cemented area by forming therein a weakened slit or channel from its flesh surface downwardly and inwardly toward but not to its grain side, applying cement to the flesh surface of the marginal portion of said sole while keeping said channel closed and excluding any save a possible slight seepage of cement from said channel, and sticking said cemented sole margin to the bottom of a lasted upper, whereby its outer edge portion beyond said weakened channel may break downwardly away from the body of the sole except at its integrally connected lower portion.

HENRY B. GORMAN.

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