US1604659A - Rubber heel - Google Patents

Description

. ROSS RUBBER HEEL Filed June 5, 1921 the shoe heel, and by. reason of its rigidity Patented on. as, teas.

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BENJAMIN BOSS, OF CHELSEA, MASSACHUSETTS, ASSIGHOB '10 PANTHER, RUBBER MANUF ACTURING COMPANY, OF STOUGHTON, MASSACHUSETTS, A GOZRZPORATION or nasseosrnsn'rrs.

Application filed June 3, 1921. Serial No. 474,711.

' dency of the heel to reassume its original" curved form causes itto press against the edges of the shoe heel. A concavo-conveX heel made of firm rubber compound will, in such case, form a close joint, or a tight edge, between the rubber heel and the shoe heel, but wherethe rubber compound is a soft, yielding and elastic character, the tendency of the rubber heel to reassume' its shape is not as great as in the case of'a stifl', firm rubber heel, and as a consequence the joint between the rubber heel and the shoe heel is not as tight, and besides the strains to which the heel is subjected in use tend to move it on the shoe heel,.so that it will over-shoot the edges of the shoe heel, sometimes in one place and sometimes in another; The heels are secured by means of nails driven through I washers embedded in the rubber, and Where a heel is of firm, comparatively inelastic compound, the washers being secured. in place by the nails, hold the heel in fixedpositiombut where the rubber heel is of soft, highly elastic, yielding compound, the resistance which the washers offer to the movemcnt of the heel isgreatly less, with the re sult that the heel, for'this reason also, is

liable to over-shoot the shoe heel at various points after trimming. Again, in the trim-j ming operation of a rigid, firm rubber heel,

the edge of'therubber heel can be brought into very close correspondence to the size of and firmn ss, it will maintain such relation,

but where the heel is made of soft, resilient, and highly elastic rubber compound, in the trimming of theheel to correspond to the shape of the shoe heel, the rubber gives way under the trimming tools, and thereafter when the heel is walked upon it over-shoots the shoe heel, and presents an unsightly and u'nworlnnanlike a pearance.

The object of t e present invention is to produce aconcavo-convex rubber heel having provision by virtue of which, when attached to'the shoe heel, it maintains a close joint between itself and the shoe heel, and

attaching in which the liability of over-shooting the shoe heel is diminished. To this end, the

. present invention consists in the improved rubber heel hereinafter described and particularly defined in the claims.

In the accompanying drawings illustrating the preferred form of the invention, Fig. ,1 is a plan view of the 'heel, shown with its concave attaching face uppermost; Fig. 2 is a front elevation, looking toward the -breast of the heel; and Fig. 3 is a side elevation. The heel consists of the usual rubber body-1', made preferably of soft, flexible, highlyelastic rubber. In order to prevent theattaching portion of the heel from expanding when it is nailed on the shoe heel, or when it is sub'ected to theblows and pressures'of use, it is providedon its con cave attaching face with a reinforcement 2 of canvas, which is securely united to the heel by vulcanization. This is accomplished Pitt preferably by using friction canvas, a piece of which of substantially the shape of the heel, but smaller in size, is placed in the mould on top of, the piece of compound of which the heel is to be made, and then the mould parts are put together and it is subjected to pressure and heat. The rubber compound, under the influence of the heat and pressure, flows out and fills the cavity, and when the mould. is finally closed, assumes the shape of the cavity. At the end of the vulcanization, the heel with the canvas layer on its concave face vulcanized therein, comprises a singleunitary rubber heel, having a reinforcement on its concave side preventing elongation of the fibres of the concave side of the heel.

Viewed in its broader aspects, the present invention contemplates a concave-convex heel havin its concave surface formed of material 0' greater tensile strength than the.

material of the body of the heel. This prevents the widening and lengthening of the surface of the heel, in use on the shoe, an exerts a tension on the attaching surface of the rubber heel, which causes the heel strongly. to tend to reassume its original form, and thereby causes the rubber heel edges to press with elhcient pressure upon the edges of the shoe heel, thereby making a ,close joint and securing a tight edged heel.

While the preferred embodiment of the invention contemplates the use of soft, flexible, highly elastic rubber compound for the body of the heel, and While the best results are secured by the usetof such compound, still it is vvith-inthe ,pnrviewof the lIlVQIl "tion to make the heel Of any suitable compound, andtmprovide it with an attaching face of greater tensile strength. than the body of the heel. The 'heel has an attaching face of relatively greater tensile strength than the 'bodyof the-heel.

The presence of this} attaching face of greater tensile strengthand relatively less" elasticity. than thegb'ody of. the heel, stiifens. the heelnear the shoe heel,so. that it will not yield-as= does airubber heel ,during the,

trimming operation, with the result that a nicer register of outlinebetween the heel and the shoe heel is secured, andathe main en nce oi -su h r gi temobv ates h over:-

shooting of the shoeheel by the; rubber heel.

Furthermore, the presence of; ,this layer on the attaching face of-thevheel ofgreater tenmore firmIy-in the; body ofthe heel, andlindrical, or off other Econcavo-convex form.

iS i l 1. A rubber heel for boots and shoes. in unfiexed condition being considerably con;

Having thus described the invention, what cavo-convex and of substantially uniform thickness, adapted to be flattened! againstthe-shoe heel when nailed thereto and there, by caused to bear with increased pressure on the edges of the shoe heel, having a body of relatively yielding and elastic rubber, and an attaching face provided with a canvas reinforce vulcanized thereto, which being of relatively greater tensile strength and stiff ness than the body ofthe heel, supportsit with greater rigidity during trlmming and causes the marginalv portion of the heel to bearfupon; the-shoe heel Withjoint-closing I pressure greatly in excess of that of a similarly .curved; unreinforced heel. r

A rubber heel normally of concavo-convex form deformable to flatness and having an unbroken vedge surface of. rubber from its treadface to its attaching face, having a relatively thirr layer of substantially inextensible material at its'atta'ching face so that the neutral axes of the heel lie approximately atitsattaching face.

lw3-a-A deformable heel normally of -concavo convex .form having an unbroken edge surface of; rubber froruits tread face to its attaching Jface, said heel'having at its attaching face a layer "of substantially inextensible material which is perforable by nails, said layer being relatively. thin, to cause the neutral axes of the heel to; die approximately at its attaching. face.

4. A, deformable heel, normally of concavo-convex form, comprisingabody portion of rubber and a substantially inextensible, reinforcing element a I vulcanized to the body portion of the heel at its concave attaching face, terminating inside of the, edge of thefheel and embedded-in and flush with the rubber, the area of said-i reinforcing elementfsufiiciently approximating the area ofsaid concave attachingface. tov prevent substantial stretching of said concave face during the application of pressure in the heel attaching operation. I

5 A deformable heel normally of concavoconvex form" comprising a body portion of rubber anda substantially inextensible, fabric reinforcing element, said fabric. reinforcing element terminating inside of the edge of the heel andbeingembedded in and flush lwitii therubber at the. attaching face of the 6. A deformable heel normally of concavoconvex form onevery plane ofcross section comprising a .bodyportion of rubber and a substantially inextensible fabric reinforcing element united to thebody portion of the heel at its concave attaching face, said fabric reinforcing elementterminating inside of the edge of the heel and being embedded in and flush with the rubber.

BENJAMIN ROSS.

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