Erstmal: Danke für diesen Beitrag!
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Ich habe es nicht mehr im Verlauf, stattdessen fand sich weitere erhellende Patentschrift-Prosa bezüglich möglicher GYW-Approaches.
Hinsichtlich der gesundheitlichen Bedenken:
ich habe bspw. Erfahrungen mit GYW Chukka-Boots gemacht -relativ dünne Brandsohle, einfache und relativ minderwertige Laufsohle, relativ üppige Korkpastenschicht, die sich entsprechend komprimiert und großflächig abgelöst hat, Aufstellen/Aufbiegen der Rahmenränder- die waren so schnell "durchgetreten", dass ich mir schon einen Senk-Spreizfuß diagnostizieren wollte.
War dann zwar nicht so, eine Begünstigung einer solchen Fehlstellung wäre allerdings mMn anzunehmen, wobei das Anbringen einer Pelotte den Gang zum Schuhmacher "Ohohoh, das wird teuer" wohl nur leidlich hinausgezögert hätte.
Diese Linie wird wohl inzwischen mit einer Zwischensohle und halber Kunststoffsohle regulär für etwa 150-200 GBP angeboten, hält dann bestimmt länger...
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Foot comfort demands longitudinal flexibility in the shoe bottom, and shoe manufacturers have long sought for constructions or procedures whereby a high degree of flexibility might be attained. However, when the shoe bottom com prises two or more superimposed sole elements, for example, an insole and outer sole, it is very diflicult to obtain an ideal degree of flexibility. The most flexible shoe (aside from true moccasins) has been the turn shoe, which has no insole, the outer sole being lasted directly to the upper. While turn shoes, especially for womens wear, have in the past constituted a substantial percentage of the total number of shoes manufactured, the difficulties incident to the making of such shoes, and in particular the necessity for highly skilled hand labor, has discouraged the making of such shoes in recent years, so that the turn shoe process has been relegated largely to the manufacture of slippers or similar soft and generally shapeless articles of footwear.
Next to the turn shoe in flexibility is the Goodyear welt shoe, wherein the outer sole is connected to the insole by a flexible welt strip, which allows a, substantial relative motion of the insole and outer sole, thus favoring flexibility.
However, the Goodyear welt insole must have a sewing ribto receive the inseam or welt-attaching stitches. In the earlier days of the Goodyear welt process, the insole was usually made of leather and was channeled to provide a lip or lips, which could be turned up to form the sewing rib, but this method required the use of insole stock of substantial thickness and concomitant stiffness. Later, in the effort to obtain a thinner and more flexible insole (and incidentally a cheaper insole), it was proposed to secure a separate rib-forming element to a flat insole blank, so that it was no longer necessary to channel the insole material. A method of providing a flat insole blank with a sewing rib is disclosed, for example, in the patents to Poole, 1,137,282, April 27, 1915, and 1,244,891, October 30, 1917. By following this procedure, it should be possible, in theory at least, to apply a sewing rib to an insole blank of any degree of thinness, but since the machine operation of uniting the rib to the flat blank (for example, as described in the above patents to Poole) involves a progressive feeding or advance of the work, it is necessary that the insole blank have a certain degree of stiffness to prevent it from puckering or buckling as it is advanced. Thus there is a minimum thickness of blank stock necessary to the practical manufacture of insoles according to this prior method, and consequently the maximum obtainable flexibility may be less than that which would be desirable in any given case. However, except for these practical limitations, the insole blank might, for example, be of paper thickness (if possessing a substantial degree of toughness), since in a completed Goodyear welt shoe, the insole has little structural utility.
The present invention has for its principal object the provision of a method of preparing Goodyear welt insoles whereby it becomes possible to use insole material which is substantially devoid of inherent stiffness, and which may be as thin as desired. For example, the selected insole material may be of cloth, plastic sheeting, sheepskin or other flexible sheet material, usually much cheaper than the leather commonly employed as insole stock.
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