US1962053A - Method of reenforcing insoles - Google Patents

Description

June 5, 1934.

T. A. CALNAN 1,962,053

,METHOD OF REENFORCING INSOLES Filed June 15, 1952 if I Patented June 5, 193 4 PATENT. OFFICE 1,962,053 METHOD OF REENFORCING INSOLES Thomas A. Calnan, 'Montmorency, France, as-

signor to Boston Blacking & Chemical 002, a. corporation of Massachusetts Application June 15, 1932, Serial No. 617,466

Objects of my invention are to provide a meth-.,

0d of reenforcing insoles with textile fabric such as duck by'which it is practicable to eliminate the application of a coat of. adhesive to the face of the duck prior to the coating which is applied by the shoe manufacturer, and to prevent, in a simple and inexpensive manner, ravelling of the cut edges of strips of uncoated textile fabric which may be used in said insole reenforcing method.

With the above and other objects in view the invention will now be described with' reference to the accompanying drawing and pointed out in the claims.

In the drawing, r v

Fig. 1 illustrates the application by spraying of discrete particles of a suitable adhesive on to an end surfaceof a roll of duck;

Fig. 2 illustrates the applying or a coating of adhesive to a strip of duck the edges of which have been prevented from ravelling in the manner illustrated in Fig. 1, and also illustrating the applyingoi the strip to an insole and the severing from the strip of a portion of sufficient length to reenforce the insole;

Fig. 3 illustrates the forming of the cut-off portion of the material against the. inner face of the rib of the insole and against the bottom oi the insole by means of a hand tool; and

Fig. 4 illustrates the operation of further forming the reenforcing material to the insole and trimming oil the excess of the reenforcing material flush with the outer edge of the rib' of the insole by the operating instrumentalities of an insole reenforcing machine. L

The roll 10 in Fig. 1 comprises, a continuous strip 12 of uncoated duck cut from relatively wide webbing as disclosed in Ellis Patent No. 1,830,428, to a width suitable to the reenforcement of an insole, as indicated in Fig. 3, and of such length as to provide a roll of convenient size, say a foot, more or less, in diameter. Separate, discrete particles of adhesive, illustrated at 14 in Fig. 1, areapplied to the ends of the roll and distributed substantially uniformly thereover, as by means of a spray gun of well-known character, illustrated at 16 in Fig. 1; whereby the edge or marginal threads are adhesively bonded to the body of the fabric. While various types of adhesive may be used for this purpose I prefer to use a suitably protected water dispersed rubber cement or latex,.compounded either from the natural latex of a rubber tree such as the Heo'ea brasz'liensz's or from an artificial water dis- 60. persion of previously coagulated rubber, both of which are to be considered as within the meaning of the word latex as used herein. An ex. ample of such a protected latex adhesive may be made by mixing 9 parts by volume of a 35 65. degrees Beaum sodium silicate solution, 9 parts of protected latex, compounded as hereinafter described, and 2 parts of water, thereby providing a solution which can be sprayed readily and of such a nature that the non-coalescing, dis- 7,0. crete particles of adhesive .on the ends of the roll will adhere firmly, sinking into thematerial sufiiciently to bond the edge or marginal threads to the body of the-fabric-without bonding together I the edge threads of successive fabric layers, thereby preventing ravelling without, however, producing any considerable resistance to the unwinding of the roll or requiring excessive effort on the part of the operator who pulls the material manually through the coating apparatus in the shoe factory. Such anadhesive, moreover, islong lived and will not deteriorate even if the material is stored for an abnormally long time.

, The protected latex referred to above may be made up from the following ingredients: 85.. Oil of camphor .5 liters Oil of citronella .1 liters Benzol 1.5 liters Ammonium sulphoricinate 1.5 Item Nekal or neomerpin 200. grams Latex (60% rubber content) l 20. liters This is compounded by adding the oil of camphor and oil of citronella to the benzol. This mixture is then added to the ammonium sul phoricinate (sulphonated castor oil neutral'zed with ammonia). The NekalorNeomerpin (a wellknown emulsifier comprising the disulphonic acid salt of hexaline which is a sulphonated product of hydrogenated naphthalene or phenol) is dissolved in about 2 l ters of hot water to which is added cold water to make up to about 6 liters which is then added to the mixture of oil of camphor, oil of citronella, benzol and ammonium sulphoricinate. When these two solu le tions have been well mixed they should be added to the latex, stirring slowly but thoroughly.

In this composition theprincipal adhesive value is obtained from the rubber of the latex, the

sodium silicate serving both as an adhesive and.

to protect the latex. The .oil of camphor and oil of citronella improvethe flow of the material and thereby help it to spray well. The benzol softens the rubber causing it to swell and helps the adhesive to dry quickly. If preferred toluol may be used in place of benzol. Ammonium sulphoricinate softens the rubber and increases its adhesiveness. The Nekal or Neomerpin acts as an emulsifier and together with the sodium silicate enables the adhesive to be stored for a reasonable time before it is sprayed.

Another variety of protected latex which may be used for this operation is one the rubber particles of which are protected with a casein-formaldehyde condensation product adsorbed on the surface of the particles, the adhesive containing only a small proportion of the casein formaldehyde condensation product as compared to the rubber. Such an adhesive, diluted sufiiciently to be readily sprayable, will be found effective for the present purposes. 7

The uncoated fabric the cut edges of which are prevented from ravelling by this treatment may be handled and appliedto the insoles in the manner disclosed in the Ellis Patent No. 1,830,428, except that the coating of adhesive, whch preferably contains a substantial proportion of rubber, and which is applied to the fabric immediately before it is applied to the insole, can advantageously be somewhat thicker.

The treated rolls of slitted duck wherein the marginal threads are adhesively bonded to the body of the otherwise uncoated fabric are purchased by the shoe manufacturer who passes the strip progressively through a sutable coating apparatus, illustrated at 18 in Fig. 2, wherein the strip of fabric is closely engaged by cooperating members, and adhesive, preferably containing a substantial proportion of rubber, applied to one side of the closely-engaged fabric. This apparatus may be of the character disclosed in Letters Patent of the United States No. 1,771,388, granted July 22, 1930, on an application filed in the name of Russell K. Nash, or of the character disclosed in Letters Patent of the United States No. 1,898,383, granted February 21, 1933, on another application filed in the name of said Nash.

In the operation of both of the above-mentioned the manner hereinabove described, is laid out on.

a bench or table 20 (Fig. 2) and a suitably prepared insole 22 is applied to the coated end'of the strip. As illustrated, the insole'is provided with a lip or rib 21. This lip and the shank and forepart of the insole are to be reenforced but the heel seat portion 24 is to be left bare. After the insole has been applied to the end of the strip the desired portion of the strip is severed, as indicated at 26.' The insole isthen turned over and the severed portion 28 (Fig. 3) is formed to the lip 21 of the insole by boning down with a hand tool 30. Then the material is further formed to the lip of the insole and the surplus which extends beyond the lip of the insole trimmed oil, for example with the aid of an insole reenforcing machine such as that disclosed in Letters Patent of the United States No. 1,726,800, granted September 3, 1929 on an application filed in the name of Frederic E. Bertrand. Such machine forming and trimming of the material is illustrated in Fig. 4 in which the marginal portion of the insole is'held between driven rolls 32 and 34 while the reenforcing material is tucked in the angle between the rib and the bottom of the insole by a driven roll 36. The portion of the reenforcing material which extends beyond the outer edge of the lip is trimmed off by a rapidly rotating disk knife 38. g

Certain of the advantages of my invention as compared with prior art practices will now be apparent. Prior to my invention, when a strip of uncoated fabrc having cut edges was drawn through an adhesive-applying device wherein the fabric is closely engaged by cooperating and lateral guide members, the marginal threads loosened or ravelled. Many of these loosened threads in fairly short lengths became separated from the body of 'the' fabric. Certain of these loosened threads became admixed with the adhesive composition and were distributed over the adhesive-coated surface of the fabric. When such fabric was applied to the insole these scattered threads provided undesirable ridges and to avoid this result it was necessary to remove these threads individually from the fabric before application to the insole, a process time consuming and expensive. Other loosened threads served to clog the adhesive-applying machine, rendering difficult the application of adhesive in predetermined uniform quantity and necessitating frequent dismantling and cleaning of the adhesiveapplying device. ,By my invention, on the other hand. wherein the marginal portions of the uncoated fabric are adhesively bonded to the body of the fabric, such loosening of the edge threads is minimized or substantially prevented, wh le the necessity of pre-coating the fabric is obviated.

Furthermore, according to another feature of the invention, wherein the edge or marginal threads of aroll of fabric are bondedto the body of the fabric by separate, discrete particles of adhesive, ravelling is prevented or minimized when the roll is unwound, partly by reason of the fact that the threads of successive superimposed layers of fabric are not bonded together, as occurs when a continuous layer of adhesive is applied to the sides of a roll with the accompanying result of increased, rather than decreased, ravelling upon unwinding the fabric. Having thus described my invention what I claim as new and desire to secure Patent of the United States is:

1. That improvement in methods of reenforcing insoles which comprises providing a continuous strip of uncoated duck having cut edges and having. its marginal threads adhesively bonded to the body of said duck,drawng. said duck progressively between members closely engaging the strip of duck over substantially its entire width and applying. adhesive to the 'closelyengaged duck and afiixing the adhesive-coated duck to insoles. p

2.- That improvement in methods of reenforcing insoles which comprises providing .a continuous strip of uncoated duck having cut edges and having, its marginal threads adhesively bonded to the body of said duck, drawing said duck progressively between lateral guide members cooperating with the marginal portions of the duck and applying adhesive to the laterally-guided THOMAS A. CALNAN.

by Letters

Images