US2863228A - Ribbed insoles for welt shoes - Google Patents

Description

Dec. 9, 1958 s. M. GRISWOLD 2,863,228

RIBBED INSOLES FOR WELT SHOES Original Filed July 1, 1955 2 Sheets-Sheet 1 [nvenior Sfanley M Griswold Dec. 9, 1958 s. M. GRIswoLD 2,353,228

RIBBED INSOLES FOR WELTSHOES Original Filed July 1, 1953 2 Sheets-Sheet 2 [n ven L or Sfazzley M Griswold 74 \l l United States RIBBED INSOLES FOR WELT SHOES Stanley M. Griswold, Newton, Mass, assignor to B. B.

Chemical Co., Boston, Mass, a corporation of Massachusetts and this application July 24, 1956, Serial No. 1(

3 Claims. (Cl. 36--22) This invention relates to ribbed insoles for welt shoes, and more particularly to insoles of the type disclosed in Letters Patent of the United States No. 2,623,306, granted December 30, 1952, upon an application filedin my name.

The present application is a division of a copending application, Serial No. 365,400, filed July 1, 1953 now 20 United States Letters Patent No. 2,790,189, granted April 30, 1957.

In my prior patent, the outer face of the insole including the rib is covered with an allover layer of stiffened canvas such as Gem duck which is relatively expensive. An object of the present invention is to render the insole less expensive by eliminating the use of canvas, except in the rib, and providing, in its place, an allover layer of cheap sheet material.

Such cheap material may be Onco or Texon, both commercial products made of wood pulp with a latex binder.

To produce the insole according to the present invention, a layer of such material, for example Onco, larger than the insole desired is provided and a slit or slot is cut through it corresponding to the shape of an insole rib. Then a prefabricated ribbed strip having a flange projecting from the rib at each side of its base is provided and the rib of such strip is forced through the slit or slot in said layer as far as permitted by its flanges. An insole blank of suitable material, such as leather, larger than the insole to be produced, is cemented and laid upon the Onco layer on that side thereof on which the flanges of the ribbed strip are exposed. Pressure is then applied to cause the three elements to be assembled into an integral unit, and the layer of Onco, the insole blank and, if necessary, a portion of the outer flange of the rib are trimmed at a suitable distance from the rib to form a ribbed insole.

Conveniently a matrix such as that disclosed in Letters Patent of the United States No. 2,577,750, granted December 11, 1951, in my name and that of Hans C. Paulsen, may be used. This matrix comprises an insoleshaped block of uniform thickness having in each flat face a rib groove corresponding in depth and width respectively to the height and thickness of the rib to be used. The matrix has a groove in its edge face the bot tom of which is at a uniform distance from the rib groove. A layer of material, such as Onco, is fastened to one flat face of the matrix and, with a suitable tool, an opening is formed through the layer, the opening being preferably a slot corresponding in width to the width of the groove, the slot extending throughout the extent of the groove. A prefabricated ribbed strip, which may be prepared in a variety of forms but each having a rib and a flange at each side of the rib, which flanges are cemented on both sides, has its ri-b portion passed through the slot in the Onco layer and its flanges pressed against the outer surface of this layer, which surface is also precemented. The above-described operation is performed on the opposite face of the matrix. Then a body layer or insele blank of the size of the Onco F ice layer and precemented on one side is placed with its cemented face in contact with the Onco layer on eachside of the matrix. Pressure is then applied to cause each body layer to adhere to one of the Onco layers and to the flanges of the ribbed strip lying upon it. The portions of the body layers and the Onco layers, and perhaps at least a portion of the outer flanges of the ribs extending beyond the matrix, are then trimmed to the shape of the matrix, using the edge face thereof as a guide. The insoles are then pulled off the matrix, a pair of mating insoles being thus produced.

In the drawings,

Fig. 1 is a plan view of a matrix;

Fig. 2 is a fragmentary sectional view of a matrix;

Fig. 3 ,is a perspective view showing a piece of sheet material clamped to the matrix and the slot being formed by use of a tool;

Fig. 4 is a considerably enlarged perspective view of a tool that may be used;

Fig. 5 is a perspective view illustrating the operation of inserting the rib of a prefabricated ribbed strip through the slot in the sheet material shown in Fig. 3;

Figs. 6, 7, 8 and 9 are fragmentary perspective views of various prefabricated ribbed strips that may be employed;

Fig. 10 is an enlarged fragmentary, sectional view of a matrix after the sheet material has been applied to each side of the matrix and the ribs of the ribbed strips inserted through the slots in the sheet material;

Fig. 11 is a sectional view illustrating the application of pressure to the assemblage of Fig. 10 after the body portion has been applied to each side of the matrix;

Fig. 12 is an enlarged fragmentary section. of the matrix and insoles after trimming the insoles to the shape of the matrix; and

Fig. 13 is a plan view of the ribbed side of one of the insoles after removal from the matrix.

In practising the present invention, it is convenient to provide a matrix such as that disclosed in the patent last referred to and which, as illustrated in Fig. 1, consists of an insole-shaped block of wood, fiber or plastic, having in each flat face a groove 22 of a depth and width corresponding respectively to the height and thickness of the desired insole rib, the walls of the groove, being preferably inclined (Fig. 2) inwardly of the matrix at an angle of about 25 to a line perpendicular to the fiat face of the matrix at an edge of the groove.

A piece of sheet material which may be latex-impregnated wood fiber 24, such as Onco or Texon cemented on its outer face, as at 25, is laid upon the matrix, as shown in Fig. 3, and preferably fastened or clamped thereto, for example by a C-clamp 26. Then, with a suitable cutting tool such as a chisel-like tool 28, a slot 34 is cut in the piece of Onco throughout the extent of the groove 22.

The tool may consist of a piece of sheet steel formed as a channel member (Fig. 4) having a bottom 32 and sides 34, 36. The bottom is extended beyond the sides to form a pilot 38 having a chisel-like edge 40. The sides adjacent to the pilot are upwardly and outwardly inclined with respect to the bottom 32 and are beveled on their inner surfaces to form inclined cutting edges 42, 44. The tool has a handle 46 by which it may be manipulated first to cause the pilot 38 to cut through the Onco at the end of the groove 22 and then, by greater or less reciprocative movement of the tool in the plane of the groove, the edges 42, 44 are caused to cut the Onco progressively along the sides of the groove to form a strip 48 (Fig. 3). When the opposite end of the groove is reached the pilot is used to sever the end of the strip 48, which is then removed and discarded.

A prefabricated ribbed strip 50 (Fig. 6) of indefinite Patented Dec. 9, 1958 I 3 length is made up of a strip of canvas 52 cemented on both sides, as indicated at 53 and 53', and wide enough to cover a core piece 54 and form flanges 56, 58, one on each side adjacent to one edge of the core piece. The core piece 54 may be of canvas impregnated with a condensation product of phenol formaldehyde and may have a reinforcing piece 60 of canvas coated with coumarone indene resin cemented thereto with latex, as disclosed in my Patent No. 2,623,306 above mentioned. The reinforcing piece 60, however, has preferably a very narrow flange 62 instead of a wide one, as shown in Fig. 6, although the construction of Fig. 7, otherwise similar, may be used if desired. The narrow flange 62, however, enables the flange 58 to be bonded more completely to the body portion of the insole.

The form of ribbed strip shown in Fig. 8 may be employed wherein the fold of the usual canvas 52 en closes a core piece composed of two strips 64, 65 of Onco or similar material cemented together with sodium silicate 66 which stiflens the core piece to withstand widthwise pressure but does not interfere with the penetration thereof by the needle of an inseaming machine. The strips 64, 65 may be made wider than the depth of the groove 22 so that the portion of the strips extending beyond the flanges may be upset or headed over as at 67 to provide a better base for the rib when secured to a body portion.

In Fig. 9 a ribbed strip is shown having a single strip 68 forming the core piece in the fold of the usual canvas 52. Such a ribbed strip may be employed by itself under some conditions and, as shown, if desired a reinforcing strip 70 of canvas or the like may be cemented to the inner face of the rib, the strip preferably being wide enough to form a flange 72 at the base of the rib.

The rib portion of any one of the ribbed strips described is introduced through the slot into the grooves 22 of the matrix, as shown in Fig. 5, with the narrow flange 56 extending outwardly of the matrix, this operation being performed throughout the extent of the slot 30 and groove 22 and the ribbed strip cut off.

The operations of applying an allover layer 24 of Onco, forming the slot and inserting the rib of the ribbed strip are performed on the opposite side of the matrix, as indicated in Fig. 10. A precemented body layer or insole blank 74 is then laid on each side of the matrix, as illustrated in Fig. 11, and the assembly subjected to pressure between rolls or platens 76, 78. The portions of the body layers 74 and of the Onco layers 24 which project beyond the matrix are then trimmed ofl (Fig. 12) utilizing as a guide the edge face of the matrix. The insoles are then removed from the matrix, one being as shown in Fig. 13 and the other being exactly similar thereto except that it is like a mirror image of the one shown. Thus, an exactly mating pair of insoles is produced..

It is to be understood that the invention is not limited to cutting a slot in the Onco to receive the rib of the ribbed strip but that a slit along the middle of the groove 22 in the matrix or along either side of the groove may be utilized to allow the rib to be forced through the Onco into the groove 22; also, that the terms Onco and Texon used to designate the allover layer 24 are ,4 not restrictive, but that any suitable material may be employed.

It will be seen that, since the strip 52 is cemented on both sides, the core piece is cemented on both sides and the meeting faces of the body layer 74 and the sheet material 24 are cemented, the various parts are bonded together into substantially an integral whole, the canvas 52 being bonded to the core piece, and the flanges 56, 58 being bonded on one side to the sheet material 24 and on the other side to the body layer 74. While the canvas strip is cemented on both sides for convenience, it is necessary to rement only the inner side of the strip and both sides of the flange. The cement on the outer side of the rib, however, does no harm and that on the inner side of the rib is useful when the reinforcing strip 70 is employed.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. An insole for welt shoes comprising a body layer, a reinforcing layer coextensive with the body layer and having therein a rib receiving slot of a contour generally corresponding to that of the insole, and a prefabricated ribbed strip having oppositely extending flanges at the base of the rib cemented to the side of said reinforcing layer which faces the body layer, the rib of said strip extending through the slot of said reinforcing layer, and the flanges extending between said body layer and said reinforcing layer.

2. An insole for welt shoes comprising a body layer, a reinforcing layer coextensive with the body layer and having therein a rib receiving slot of a contour generally corresponding to that of the insole, two strips of felted fibrous material impregnated with latex cemented together, and a strip of canvas embracing the two strips with its margins extending on each side thereof, the strips extending through the slot in the reinforcing layer, the margins of the canvas strip cemented to the reinforcing layer, and the body layer cemented to the reinforcing layer and to the flanges of the canvas strip.

3. An insole for welt shoes comprising a body layer, a reinforcing layer coextensive with the body layer having a rib receiving slot contoured to correspond to the contour of the insole, and a ribbed strip having two core pieces of felted fibrous material impregnated with latex secured together with sodium silicate and having a strip of canvas extending about the core pieces, the canvas strip being wide enough to form flanges one at each side of the core pieces, the covered core pieces passing through the slot in the reinforcing layer, the flanges cemented to the reinforcing layer and the body layer cemented to the reinforcing layer and to the flanges of the ribbed strip.

References Cited in the file of this patent UNITED STATES PATENTS 1,296,894 Winslow Mar. 11, 1919 1,896,531 Valentine Feb. 7, 1933 2,121,938 Wagner June 28, 1938 2,352,715 Jalbert et al. July 4, 1944 2,398,277 Ayers Apr. 9, 1946 2,538,277 Griswold Jan. 23, 1951

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