Патент USA US2403950код для вставки
July 16,'1946. N. Rosi-:NTHAL " sHANK 'STIFFENER Filed Feb. 28, 1945 2,403,950 2,403,950 Patented July 16, 1946 „UNITED STATES PATENT oFI-‘ICE 2,403,950 SHANK STIFFENER. Nathan Rosenthal, Newton, Mass. Aapplication February 28, 1945, .Serial No. 580,191 2 Claims. (Cl. Sii-'76) 1 2 My present invention is a novel and improved shank stiffener for use in the manufacture of boots and shoes, and is directed particularly to provide a shank stiffening and arch-supporting feature with special reinforcements in the arch supporting portion of the shoe. Heretofore, it has been customary to make shank stiffeners of metal which would be ñtted between the insole and outsole and Would give a stiffening and reinforcing effect in the arch of the shoe between the heel and the tread portion ing element at a diñerent and much sharper angle, predetermining the contour and form of the shoe and insole at this lateral arch part and, hence, affording support to the foot of the wearer. `It has also been customary to have one or more arch portions. Furthermore, by having the lateral arch of , Thus, my improved shank stiffener has in herent and added streng-th by reason of the di vergent arched areas of the longitudinal and the lateral portions, the line of juncture between the lateral and the longitudinal differing arc forma tions constituting i-tself a truss-like effect or rib which, furthermore, will preferably have a dis tinct rib formation to predetermine the line- of of the forepart. Such metal stiffeners were usu demarcation between the lateral and lengthwise ally .secured to the heel and extended forwardly arch and thus constitute a common supporting in a preformed curve to a sliding engagement at 15 element for both the longitudinal and lateral the ball or forward portion of the outsole. longitudinal corrugations or ribs formed in a part of the shank stiffener to aid in holding the arch of the shoe in predetermined arc-shape. less length than that of the lengthwise arch por tion, I secure the benefit of a full support at the My present improved arch stiffener constitutes 20 heel and on the ball of the forepart of the shoe for the lengthwise strengthening part, these being a double reinforcing structure wherein a :part of fully equivalent to standard arch supports as at the arch stiifener comprises a strengthening and present in use. reinforcing element longitudinally from the heel Furthermore, by having one or more reinforc to the ball of the shoe, and a second preformed portion with a distinct disaligned arc structure in 25 ing rib structures in the lateral arch itself, great er strength is added and the predetermined con the shank stiffener which will automatically effect tour of the shoe itself is permanently maintained. a supporting and lifting of the lateral or side por Referring to 'the drawings illustrating preferred tion of the arch of the shoe and, hence, consti embodiments: tute a support for the side arch portion of the 30 Fig. 1 is a plan View of my improved shank foot of the wearer. stiffener Vwith the longitudinal and transverse Furthermore, I so arrange and construct my present improved shank stiffener as to provide arc-supporting structure; Fig. 2 is a corresponding plan view illustrating reinforcing and stiffening convolutions; defining the area lbetweenthe fore and aft arch Fig. 3 is a plan view illustrating a modification and the lateral supporting feature. In order to of reinforcing convolutions; secure additional rigidity in the lateral supporting Fig. 4 is a side View of the shank stiffener of feature, I provide one or more ribs therein, which Fig. 1 showing the longitudinal arc contour, and ribs may be and preferably are of curved contour Fig. 5 is a diagrammatic view on the line 5-5 and may be either longitudinally or crosswise of the length of the stiffener. In either case, the 40 of Fig. 1 illustrating the shank stiffener as applied to the insole on a last illustrating the transverse side or lateral arc portion of the shank stiffener arc feature. gives a vastly greater and increased lateral arch My shank stiifener may be and preferably is support to the sole of the shoe in which the made of metal stamped into longitudinal and stiffener is fitted, as well as to the foot of the transverse arc- curves, which may be varied for wearer, giving a firm support and brace to the a reinforcing rib member in a curved formation, the particular style, design, and size of shoe to _ which my shank stiffeners are to be fitted. The Thus, my present stiifener comprises a double shank stiffeners as shoWn in the drawings are reinforcing shoe shank stiffener, having one arc illustrative of a moderate arc contour both longi formation for the longitudinal or fore and aft structure of the shoe, and a divergent and dif 50 tudinally and transversely, which arcs can be greatly increased where desired. ferent lateral arched contour with reinforce Referring to Fig. 1, the arch stiifener comprises ments therein for the side or lateral arch of the a metal plate l of appropriate length and con shoe and foot. Thus, my shank stiffener consti tour and, preferably, stamped from sheet mate tutes a reinforcing element from the heel to the forepart, and also a side or lateral arch-support 55 rial having a heel-engaging portion 2 and an op lateral arch of the shoe. 3 2,403,950 posite edge portion 3 to engage the ball of the shoe sole, which portion 3 may beand preferably is somewhat larger than the heel part, with a predetermined longitudinal curve from the heel part 2 lengthwise throughout a substantial width wise area of the shank stiiîener to the forepart 3. Holes 5 to enable the shank stiffener to be nailed ñrmly to the heel of the shoe are provided, and the forepart 3 is preferably unattached and is allowed to slide slightly to adjust itself to the contour of the sole and insole during use and to aid in the flexibility of the shoe at the ball por tion. The transverse or widthwise arc is prefer ably formed on the blank during the original stamping-out action, or it may be shaped and curved afterwards, and consists in the transverse arc-shaped area I!) throughout a substantial ex tent of the length of the shank stiffener. As shown in Fig. l, this transverse area IU may be stamped from where the heel part of the shank stiffener extends over the heel breast of the shoe, as indicated approximately at I2, Fig. 1, extending to the extreme forepart of the edge 3, as shown at I3, and merging into the longitudinal arc portion of the shank stiifener I on a curved line, 25 4 curved reinforced convolution or rib 25, and various modifications of such reinforcing element will readily occur to those skilled in this art, the important characteristic of my longitudinal transverse arch formation being thus maintained to hold the shoe in exactly the shape and support ing contour for which it is designed. As shown in Fig. 5, my shank stiifener is illus trated as applied to an insole 30 between the sewing ribs 3I and 32, which insole is illustrated as positioned on a last 35, the last having a com plemental cut-away portion 36 to cooperate with the lateral arc-shaped edge I0 of my improved shank stiiîener. This construction enables the foot-supporting portion of the insole to be pre curved widthwise and to aid in merging the cor responding part of the insole with the uplifting adjacent part of the upper materials (not shown). My shank stiffener may be applied to the insole before it is fitted to the last or may be applied afterward but before lasting so as to thus impart to the insole the initial foot-supporting feature at the arch of the shoe and, hence, of the foot of the wearer. My improved shank stiffener is entirely within as approximately indicated at I5, which curved the inner side of the sewing ribs of the insole and line may be also formed as a stiiîening convo lution or rib. shoe and, hence, takes the place of the ordinary the transverse arc portion IU in reinforced pre- ' a divergent line or curve from the longitudinal formed contour. Additional ribs 23 and 24 may be also stamped or otherwise formed in the blank curve, the side portion being reinforced by ribbed convolutions extending crosswise of the said side metal shank stiffener; but in my present im This rib I5 thus acts jointly to hold both the proved construction, I provide one or more stiiî longitudinal arc of the main part of the stiffener 3 0 ening elements, such as ribbed convolutions in I in its preformed position as well as serving to the laterally curved part of the shank stiifener, stiffen and hold the transverse arc portion IIJ in as distinguished from the longitudinally curved its preformed position. portion and any longitudinal ribbed strengthen My improved shank stiffeners are made for ing elements. I believe it to be a distinct novelty “rights” and “lefts” with the transverse arc por 35 in this art to have stiiîening elements in the lat tion ID adapted to lift the insole and, hence, sup erally curved or concavo-convex side portion, port the foot of the wearer on the inner trans whether such ribbed strengthening elements are verse arch portion of the shoe and foot, thereby longitudinally curved or crosswise. affording a snugger fitting and hugging of the I claim: ' foot, which also facilitates the lasting operation, l. A metal shank stiifener of the kind de enabling the shoe upper materials to be drawn scribed, comprising a longitudinally curved por down smoother and firmer during lasting, tion and a laterally extending concavo-convex In Fig. 2 I have shown a plurality of reinforce side portion, said side portion being formed in a ing ribs or convolutions to still further hold and divergent line or curve from the longitudinal maintain both the longitudinal and transverse a; curve, the side portion being reinforced. arc-shaped portions of the shank stiffener in their 2. A metal shank stiiïener of the kind de predetermined curved position- The longitudinal scribed, comprising a longitudinally curved por rib 20 aids in holding the longitudinal arc while tion and a laterally extending concavo-convex one or more transverse ribs 2`I, 22, and 23 hold side portion, said side portion being formed in during the manufacturing operations. In Fig. 3 I have illustrated a single lengthwise portion. NATHAN ROSENTHAL.