US 1255107 A
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Description (OCR text may contain errors)
T. C. REDFERN.
sHoE soLE. APPLICATION FILED JUNE I6, 1916.
1,255,107. A Patented Jan. 29,1918.
THOMAS CROMPTONREDFERN, 0F HYDE, ENGLAND.
` suon-Sonn. i
Specication of Letters Patent.
Patented Jan. 29, 191s.
Application filed-June 16, 1916.4 Serial No. 104,005.
is used for making shoe soles, the soles, areliable to crack across at the place where the maximum bending occurs, particularly -if the material has been rolled out so that the fibers are in the main transverse to the sole.A
One contributory cause of this cracking is also that the material is liable to expandL where the bending occurs, and ultimately some air becomes imprisoned between the composition sole and the middle sole of the shoe, this air tending to stretch the material and to balloon it by the constant action of walking. l
This ditiiculty is overcome in the improved article formin the subject of the present application which has all the necessary flexibility and excellent wearing qualities. The fibrous material may consist for instance of disintegrated rubber backing material from worn-out motor tires, or any other comparatively inexpensive iibrous material with some waste rubber if required, and with a comparatively small .proportion of indiarubber or gutta-percha and hardening or vulcanizing agents. This material vis rolled'- out into sheets, therolling being always effected in one direction so that the bers lie mainly longitudinally to the sheet. The risk of cracking in the shoe soles iseliminate'd partly by building up the material forthe sole in layers placed successively so that the fibers in some layers lie transversely to the fibers in the other layers, and partly by ema bedding a layer of canvas in the sole near to 'the upper or inner surface thereof so as t0 resist .stretching at this surface. 4Experi-V ments have shown that a ve-ply sole gives excellent results; the sheets of fibrous material'having the fibers running principally in one direction, are rolled out to; la thickness aboutV one-ffth of the ultimate thickness required for the shoe soles, and the sheets so formed are cut into squares which are laid so that the fibersl are 1n one direction in one square and in a cross direction in the next square.. In the first, thirdv and fifth.y layers the fibers are in one direction, and in the second and'fourth they are in the other direction. The soles are cut from this'sheet so that the bers lie across the sole in the rst, third and fifth layers, while they only lie longitudinally in the second and fourth layers. The cutting is effected in the usual way by knives or dies in a press, the material so cut being laid in the molds. The top layer which will form the. upper or inner surface of the sole when vulcanized, is lifted up in the mold, a piece of canvas cut to the required shape is inserted, and the top layer is laid down again. Theri'the material is vulcanized by heating in molds, preferably under high pressure so that in-the finished article the canvas is embedded in the sole between the rst and second layers thereof. The canvas is preferably cut so that its edge comes say a quarter of an inch from the edge of the sole everywhere except at the rear part or waist where the sole is chamfered ofi", but at that part the canvas may come right up to the edge of the material.
lThe object. of cutting the canvas so that'liit.
shall not come up to the edgesin the other parts of the 'sole is to prevent canvasshow-gl ing around the edges and to leave them with* surface during wea-r, or of course it can be vstitched or riveted to the middle sole or welt.
The soles may be made up both forQitting to new boots wherein the waist portlon extends back into the heel, and also for repairing purposes when the waist portion is chamfered olf. The soles are molded to any desired curvature suitable for fitting directly to they insole andto present the desired formation -on the wearing surface.
In the accompanying drawin Figure 1- is a plan view of a shoe sole ma e up pairing purposes, and Fig. 2 is a side view thereof, while Fig. 3 shows a cross section on the line 3-3 of Fig. 1. v
In Fig. l the top layer a of the fibrous material is shown turned back at the tip to expose the insertion b of canvas. ln the sectional view Fig. 3 the top layer a is the one which is cemented to the middle sole or welt of the boot, and directly beneath this is the insertion of canvas b, while c, d, e and f are the remaining layers of the fibrous material. In the layers a, d and f the iibers run transversely to the sole, while in the layers c and e they run longitudinally for example.
The invention is not limited -to the Inaking of soles of five-ply material with the canvas inserted beneath the top layer exactly as above set forth, although experiments seem to indicate that this is the best construction. Any desired number of layers .may be used, and in some cases there may be two layers together with the ibers lying the' same way therein according to the result which it is desired to attain. rl`he embedding of the canvas in the material near to the upper surface is a matter of vital importance however, as is also the use of some layers of the `material with the fibers lying transversely to the fibers in other layers. The bers need not necessarily lie exactly transversely and longitudinally in the respective layers, but they may lie somewhat diagonally while still attaining the desired result. The canvas insertion may also be of any shape or size according to requirements.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:-
As an article of manufacture, a shoe sole consisting of a number of layers of brous material disposed with the flbers in one layer lying substantially transversely to the fibers in another, and a layer of canvas inserted between the upper layer of fibrous material and the next layer, the whole being vulcan` ized together under pressure.