US1448049A - Rubber heel and fastening device - Google Patents

Description

Mar. 13, 1923.

H. L. BEAL. 1,448,049,

RUBBQER HEEL AND FASTENING DEVICE.

' men APR. 1. 1920.

w 10 g0 I Patented Mar. 13, 1923.

umT-so sT Es HERMAN L. BEAL, or ISBOOKLINE,(MASSACHUSETTS. Y

RUBBER HEEL AND rnsrnnme nnvron.

Application fi1ed April 1,

To all whom it may concern: i p

Be it known that I, HERMAN L. 'BEAL,

a citizen of the United States, residing at' will enable others skilled in the art to which it appertains to make and use the same.- 1 The present invention relates toimprovements in rubber heels andfa'stening devices therefor. v

In securing fiat rubber heels to shoe heels the nails are often over-driven, that isto say, they are driven beyond the depth to which they should be driven, thereby compressing the rubber-of the heel between the nail washer and the shoeheel. The compression of the rubber under the ,7 washer causes the rubber to bepushed out laterally and Where the nails are located near the edge of the shoe heel this sometimes causes the opening heel and the called bubbling. This is obviously objectionable because it detracts from the ap-' pearance of the heel after it hasv been attached to the shoe. In the manufacture of prong heels, such,

I for example, as the heelshown in the patent to Hooper, Re. No. 14,596, wherein a prong plate is placed in the mould and the rubber compound is placed on top of the prong plate, provision has to bemade for support-' ing the plate against the pressure of the moulds when the moulds arefirst closed. In the Hooper 4 supported in the mould by posts? upon which the plate rests, three suchposts being indicated in the, drawings. If only a small pressure is applied tothe moulds before the rubber compound is heated suf- 4 ficiently to become fluent no injury is done the plate, but if pressure is applied to the moulds too quickly the'platesare by the pressure and hence it has been necessary, heel, to take pains to'seethat-the moulds are heated so as to render the compound more or less fluent before high pressure is of the joint, between the rubber a shoe heel which is sometimes patent the plate is shown as distorted in the manufacture of this type of- 1920;.seriai'n e'ieess;

applied to the mouldsf This requires more attention andskill on "the part of thepressman and therefore increases the costiof the The present invention contemplates in its broader aspects a constructionof rubber heel I and a fasteningde'vice for fastening the heel v to a shoeheel having provision-' for p'reventing bubbling on the one hand and at the same time; by the "same, device, "securing a more adequate support for the plate in themould. In the specific embodiment illustratedin the' drawings a prong heel iS shown. The prongsare provided with an enlargement betwee'n'the plate" and the attaching surface of the'heel. This "prevents over-driving the 'nails' and contributes to supporting the plate in the mould. Broadly considered it is immaterial whether the enlargeinentfwhich constitutes a distance piece,

or spacer, be "an "integral part of theprong or not, so long asa"rigi'd contrivance isv provided for preventing; over-driving and for supporting the plate' in 'the mould. In another aspect, and for securing only the advantage 'of preventing over dr'iving, it is apparent that theinvention contemplates" provlcling the heel-with a spacer or distance piece which positively determinesthe' distance of the nail head theattaching faceoftheheelT I In the accompanying drawings illustrat ing the preferred formof the invention Fig. 1 shows a Nerger-shaped heel having; a .prong plateprovided with prongs; Fig.2. shows a flat'heel provided with a similar prong plate;-Fig."f3 shows a view' of the prong plate alone; Fig; 4: isa section taken on the line et4:, Fig. 2 mayalso be re-] garded as a sectiontaken on a' similar line,

of the heelshown in Fig. 1, after such heel has been attached to the shoe heel) Fig.

is a View of the prong or nail; Fig. 6]is a sectional view 'of'a' mould with the prong plate in place and Fig. '7 is a transverse sectional new of a heel secured to a shoe heel, (in both Figs. 6"and- 7thefsect'ion is taken on a line corresponding with the line g.- t.

' The illustrated embodiment of the invention is described as follows; I The body por:

tion 10 of the rubberheel may be 'ofthe in the prong holes in the plate.

Nerger shape, as shown in Fig. 1, or the flatheel shape, as shown in Fig 2. It is pro vided with a prong device for securing it to the shoe heel. This prong device consists of a metal plate 16 to which arerigidly attached three prongs 18. The plate is tri an ular in shape, has a hole 26 in its center and three holes to receive the prongs. The central hole 26 is prefidee for the presses of permitting the rubber compound to flow through it when the malesare elosed'. With the compounds used at the present time the hole 26 has a diameter o 5%. k

The prongs 18 are enlarged at 20 and provided with a head 22 adapted to be, received he enlargement 20 is a spacer or distance piece tor locating the position of the plate in the mould and, therefore, in the rubber heel The spacer 20 of the prong is made f g long. When the prong heads 22am riveted in the plate, the spacer is reduced in length of an inch by the riveting. pressure so that after the prongs are riveted in place in the plate the spacer is long. In Fig. 6 the three parts of the mould comprising the top plate 28, center plate 30, and bot= tom plate 32, are shown in the positions which they occupy when the mould is closed. The prong plate is shown in position in the mould The holes 34 in the mould are provided to receive the prongs 18, and plate supporting pins. or posts 36 are provided in the bottom plate to project upward between the prongs and to engage and contribute to the support of the prong plate. The posts 36 form holes 40in the attaching face of the rubber heel but the presence of these holes in; the attaching, face is not objectionable. When the plate is put in place in the bottom plate, the spacers 20 of the prongs, to-

gether with the posts 36, support the plate in proper positionin the mould; It will thus be seen that when the rubber compound V is placed on top of the plate in the heel cavity with the inset 38 ot the top plate 28 pr'oje'cting into t he top of the heel cavity of the mould, and is subjjectedyto heat and pressure, the heat will soften the compound and the pressure will force it down around the plate and through the hole in the plate and cause itto conform to the shape of the cavity. The posts 86 and spacers 2,0 adequately serve to'support the plate against the pressure of the compound. Heat andpressure are continued a sufiicient length of time to vulcanize the heel, during which the prong plate is properly supported in the mould by the spacers 20 and posts 36. After vulcanization, the completed heel as shown in Figs. 1 or 2, is removed from the mould.

The completed heel is attached to, the shoe by hammering it onto the shoe heel, the shoe preferably being supported on a jack of some sort. The prongs, being large and rugged, penetrate the heel and the points are clinched onthe inside. The spacers or distance pieces of the prongs act to prevent the prongs from being overdriven; because when the spacers come up against the heel they prevent further penetration of the nails in the shoe heel. This, the-reiore; prevems" bubbling.

In rubber heels secured to the shoe heel by means 6f nails-and washers or by means of prong plates, the rubber under the washer or proiig plate is subjected to pressure during the attaching of the heel to the shoe heel, and thereafter when the heel is in use the pressure exerted on the heel in walking tends to reli'eve the nail head from the ex pansive force of the rubber'under the washer or prong plate. This pressure upon the under side of the washer or prong plate is re stored every time the foot is lifted from the ground, with the result that in use thereis. an intermittent, or variable, pressure on the under side of the nail head tending to withdraw it from the shoe heel. As is well known, this in time loosens the nail in the shoe heel and in the case of concavo-convex heels this tendency to pullthe nails is greatly increased by reason of the tendency of the heel to resume its initial curved shape, with the result that conoavo-convex heelsv operate to pull the nails out of the shoe heels. Examination of any concavo convex heel after it has been worn for a whilewill frequently show that, the nail heads have worked up toward the tread surface of the heel. This loo sening of the nails or prongs is avoided by the present invention because the nail or prong is not subjected to an increase and decrease of pressure en the under sidev of the nail, tending to pull it out of the shoe heel. This constitutes an important feature of the present invention. 3 V v,

The invention is susceptible of embodiment, in other forms. M I 1 t f It is to beobserved that the rubber heel of the present invention contemplates a rubber heel body, a nail or prong to bedrivcn into the shoe heel, a connection embedded in thebody of the heel for connecting it to the nail or prong, and a spaceror distance piece for preventing over-driving of the nails. Viewed in its broader aspects it is immaterial whether the spacer or distance piece be integral with the nail or prong or not; likewise it is immaterial what, the shape of the connection piece is by which the body of the heel is secured to the nail; andiurthermore. it is immaterial whatshapeof heel is em ployed whether curved or flat. The following claims are, therefore to be read and understood as defining the invention as broadly as their language permits.

1. A rubber heel having a fastening device comprising a plate embedded in the bedded in the heel provided with prongs body portion of the heel, nails secured to the having enlargements thereon for preventplate for attaching the rubber heel to the ing over-driving of the prongs in the shoe 10 shoe heel, the nails being provided with heel, and for contributing to the support 5 spacers for preventing the overdriving of of the prong plate in the mould.

the nails.

2. A rubber heel having a. prong plate em- HERMAN L. BEAL,

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