US2206900A - Method of lasting shoes - Google Patents

Description

y 9, 1940- H. c. KING 2,206,900

METHOD OF LASTING SHOES Filad Oct. 6. 1938 2 Sheets-Sheetl July 9, 1940. H. c. KING METHOD OF LASTING SHOES Filed Oct. 6, 1938 2--Sheets-Sh et 2 Patented July 9, 1940 2,206,900 METHOD OF LAS'IING SHOES Harry C. King, Quincy, Mass, assignor to United Shoe Machinery Corporation, Borough of Flemington, N. 3., a corporation of New Jersey Application October 6, 1938, Serial No. 233,515

6 Claims. (01. 12-145) mon use, for example latex, it is necessary to apply pressure either with or without heat to the overlasted upper for a time to insure that the cement will be sufliciently set to hold the upper in lasted position before removing the shoe from the lasting machine. This occasions considerable inconvenience and delay, especially when the heel end of the shoe is to be lasted in a separate machine such as a heel-seat lasting machine, as is now a usual practice, and it is hence desirable to remove the shoe from the toe lasting machine as soon as the upper is worked into finally lasted position.

I have discovered that fresh latex cement,'such as liquid latex, when applied to the shoe upper and/or insole and heated just before the upper is wiped into finally lasted position, is rendered capable of causing instant adhesion of the surfaces between which it is applied. Therefore, in accordance with my method, after a substantial part of the upper materials, except the outer layer, has been trimmed away around the toe portion of the shoe, latex is applied to the insole and to the inner face of the overlasted upper, the cement treated directly by heat, for exampleby applying thereto a heated iron, and the upper immediately wiped into contact with the insole, whereupon instantaneous adhesion between the upper and the insole is effected and the shoe may be immediately removed from the lasting machine. Preferably the cement on the upper as well as on the insole is treated with a heated iron which may be employed effectively as a retarder during the wiping of the upper into contact with the insole.

In the drawings:

Fig. 1 is a perspective view of the forepart of a shoe the sides of which have been lasted and illustrates the operation of trimming away the lasting allowance of the lining and toe box at the toe portion of the shoe;

Fig. 2 is a similar perspective view showing the application of latex cement to the inner face of the upper materials and the margin of the insole;

Fig. 3 is a perspective view illustrating the forepart of the shoe and the adjacent portions of the bed lasting machine showing a heated iron being applied to the latex cement just prior to, the wipingof the upper against the insole; and

Fig. 4 is a view similar to Fig. 3 showing the wipers of the lasting machine in closed position in which they apply pressure to the overlasted upper and cause instantaneous adhesion of the. upper to the insole.

In carrying out my improved method of lasting, whereby freshly applied latex cement is capable of effecting instant adhesion between an upper and an insole in the lasting operation, a shoe is prepared as illustrated in Fig. 1, where the .outer layer of the upper is indicated at ill, the lining at 2, the toe box at It, and the insole at l5. Preferably the upper rearwardly of the pullingover tacks l8 has already been lasted, for example by means of curved staples 20', though of course this part of the shoe may be lasted in any convenient manner. Either before or after the shoe is placed in the bed lasting machine, the lasting allowance of the lining l2 and the toe box 1 3 is trimmed away, for example by means of a hand knife 22. Instead of trimming these materials flush with the surface of the insole it, they may, if desired, be allowed to project oneeighth of an inch or more above the insole. Then, as shown in Fig. 2, latex cement is applied to the inner face of the upper 10 and the marginal portion of the insole l6, for example by means of a hand brush 24.

The cement may be applied to the insole and upper either before or after the shoe is placed in the bed lasting machine, and while the shoe is in the machine, either before or after the latex cement has been applied, the wipers of the machine may be utilized to upwipe the upper about the end and sides of the toe and may even be overwiped upon the insole if desired. In this case, even if cement has been applied, it will not stick. After the upper materials have been properly worked up about the sides and end of the toe and the operator is ready to Wipe the lasting allowance of the upper in contact with the insole, the cement on the insole and upper is treated by means of a heated iron 26 which has the effect of driving out the greater. portion of the Water from the water-dispersed rubber cement or latex and causing it immediately to become coalescent, that is, in condition to cause immediate adhesion between the surfaces to which it is applied. The heated iron 26 is preferably shaped to correspond more or less to the contour of the wipers 28 of the bed lasting machine and, after the cement on the insole has been treated by the heated iron, it may be employed to hold the upper against the wipers during their wiping operation to enhance the lasting operation of the wipers, that is, to effect the operation commonly performed by means of a so-called retarder. Finally the wipers 28 are fully operated to carry the lasting allowance of the upper In over the margin of the insole l6 and press it thereagainst, whereupon the latex cement causes instant adhesion between the upper and the insole, and the wipers may be withdrawn and the shoe removed.

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

1. That improvement in methods of lasting shoes which consists in preparing the toe portion of an upper for cement lasting by trimming away the lasting allowance of the lining and toe box, applying fresh latex cement to the insole and to the inner face of the upper, applying heat directly to the fresh latex cement and immediately thereafter working the upper into finally lasted position, pressing the upper and insole together, and immediately releasing the pressure.

2. That improvement in methods of lasting shoes which consists in trimming away the lasting allowance of the lining and toe box about the toe of the shoe, utilizing end-embracing wipers to upwipe the upper about the toe of the shoe, applying liquid latex cement to the inner face of the upper and the margin of the insole, rendering the freshly applied latex immediately adhesive by applying directly thereto a hot iron, and immediately utilizing the wipers to overwipe the lasting allowance of the upper and press it into contact with the insole.

3. That improvement in methods of lasting shoes which consists in trimming away a substantial part of the lasting allowance of the upper materials about the toe of the shoe except that of the outer layer, utilizing end-embracing wipers to conform the upper materials about the toe of the shoe to the shape of the last, applying liquid latex cement to the inner face of the lasting allowance of the outer layer and to the margin of the insole, rendering the freshly applied latex immediately adhesive by applying directly thereto a hot iron, and immediately utilizing the wipers to overwipe the lasting allowance of the outer layer and to press it into contact with the insole.

4. That improvement in methods of lasting shoes which consists in trimming away a substantial part of the lasting allowance of the upper materials about the toe of the shoe except that of the outer layer, utilizing end-embracing wipers to conform the upper materials about the toe of the shoe to the shape of the last, applying latex cement to the inner face of the lasting allowance of the outer layer and to the margin of the insole, rendering the latex immediately adhesive by applying thereto a hot iron, utilizing the hot iron to hold the upper against the endembracing wipers, and immediately overwiping the lasting allowance of the outer layer and pressing it into contact with the insole.

5. That improvement in methods of lasting shoes which consists in preparing the one portion of an upper for cement lasting by trimming away the lasting allowance of the upper materials except that of the outer layer, applying liquid latex cement to the insole and to the inner face of the lasting allowance of the outer layer, applying heat directly to the latex cement while still fresh and immediately thereafter working the upper into finally lasted position, pressing the upper and insole together, and immediately releasing the pressure.

6. That improvement in methods of lasting shoes which consists in trimming back the lasting allowance of the upper materials which lie inside of the outer layer. thereof about the toe of the shoe, conforming the upper materials about the toe of the shoe to the shape of the last, applying fresh latex cement to the inner face of the lasting allowance of the outer layer and to the margin of the insole, rendering the freshly applied latex adhesive by applying directly thereto a hot iron and immediately working the lasting allowance of the outer layer into lasted position over the margin of the insole, pressing it into contact with the insole, and immedateely releasing the pressure.

HARRY 0. KING.

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