US1936919A - Method of reducing the shank portions of soles - Google Patents

Description

NOV. 28, 1933. 5 |TH 1 ,936,919-

METHOD OF REDUCING THE SHANK PORTIONS OF SOLES Filed Jan. 9, 1933 /3 IWIIIWNWIIIIHllllllllmuum Patented Nov. 28, 1933 Application January 9, 1933. Serial Ne. 650,803 2 Claims. (c1. 12 '1 ig; v

This'invention relates to a method of reducingthe shank portions of the soles of boots and knife held at the desired inclination to the tread shoes.

In the manufacture of shoes the outsoles are commonly reduced by making two cuts along the opposite edges of their shank portions so as to provide thin edges at this locality. In the manufacture of certain types of shoes, for example that type in which the outsole is attached perrna v sole; and

'nently to the bottornof the lasted shoe by cement, it is desirable that the opposite edges of largest sizash'ow'ing the transverse sectlon on all soles of shoes of a given style be "reduced to the same predetermined thickness irrespective of differences in the'sizes of the sole and that this reduction be accomplished by a production of two bevels whichare' straight in transverse cross-' section. By reducing all the edgesto the same thickness, all the shoes of a given style will have the same general appearance in their shank por- By providing all the soles with bevels which are flat transversely of the soles, all points tions.

of such surfaces may be pressed firmly against the similar surfaces on the marginal portions of the lasted shoes, which is important in the attainment of secure attachment of a sole by cement. Hitherto, soles with reduced shank portions approximating the requirements indicated above have been producedfln two operations, by

feedingfirst oneside and then the other side of 3 the shank portions of soles past a stationary faces of the soles. It is diflicult by such a procedure to secure uniform results, and moreover the procedure is a relatively slow one due to the necessity for two separate operations on each sole.

In order to speed up the shank reducing operation, to simplify it, and to make it uniformly accurate, the present invention relates to a method of reducing the opposite edges of the shank portions of soles of different sizes to the same predetermined thickness by straight bevels of the same angular inclination to the tread surfaces of the soles which consists in feeding the soles successively pasta knife while progres-;

sively holding successive marginal localities in their shank portions bent in converging planes which extend from the longitudinal middle of said shank portions to said opposite edges, and

varying the distance of the knife from the middle" e '5; .1- METHoD OFBEDUCING ,THE SHANK PORTIONS 0F SQLES j John Smith, ,Swampscott', Mass, assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey 'partly in elevation showing a sole of the largest I In the manufacture, of shoes t which the soles are permanently attached to the .70

. g t apply oats ofipyroxylin cement ret duced' between thetwo coated surfaces, -it' i is necessary that they be pressed} firmly into con-- use of which the method may' 'be'conveniently v practiced, I 1 J1 Fig. 1 is a view partly in"cr oss-section'- and size in process of being operatedupon; .1 Fig. "2 is a cross-sectionof the finishedsole? Fig. 3 is a view like Fig. 1 but showinga smaller sole'in process of being operated uponf Fig. 4 is a cross-section of the finished smaller I V, 5 is aplan View-ofa finishedfsole-ofthe which Fig.1 is taken. 3 1

of thattype in lasted uppers by means of cement, it is' cusspectively to the margins of the" soles and' to the 'marg-ins'of the bottoms of the lasted shoes,

to permit these coatings to dry, to softenyone '75 or both of them, and finally to placef-the soles 0n the bottoms of the shoes and hold thefsoles T and shoes under pressureuntil the cementl-hardens.- In'order thata strong-'bond 'may--be protact throughout their cemented'areas. The soles"- are reduced by being beveled'on both sides along their-shank portions, as indicated at 7"'and:9,

so asto'lproduce thin edges.) In orderthatfthese "8 5 bevels'may bepressed firmly againstj th'e bottom.

of a shoe there should bend hollows in' their-3.". surfaces, and consequently the bevels should be: straight and flat, that is their surfacesshould appear as straight lines in transversesection. I

In orderto facilitate the reducing'of the'op'po site edges, the soles are fed past a; knife "11 while successive parts of their shank portions. 3

are being progressively held bent as-shown in; Figs. 1 and 3, and the distance between the:- knife and the middle portion of the treadlsurfaces of the soles is varied to provide for soles of different sizes. In the constructionillustrated the soles are fed through a matrix formed in" a matrix sleeve 13 by the rotation of said sleeve and by the rotation of a feed roll 15 provided with spaced disks '16 the teeth of which may penetrate more or less into the new side of the sole. Inorder to permit the distance of the middle portions of the soles from thefplane of the knife to be varied, the matrix sleeve 13,

Stewart No. 1,382,689. In order that the bevels on the opposite sides of the soles shall have, the desired flat surfaces, the walls 17, 19' of the matrix slope straight atthe same angles from the bottom 21 of the matrix to the surface of the matrix sleeve, said matrix being made large enough to accommodate soles of the largest size.- Inasmuch as large soles are longer than smaller ones and consequently the reduced'areas should vary in length in accordance with the length:

of thejsoles, the matrix sleeve is rotated at different velocities according to the lengths of the.

soles. The feed roll is rotated at constant velocity. For the longest soles the matrix sleeve is rotated at the same peripheral velocity as the feed roll; and for the shorter soles the matrix sleeve is rotated at suitably increased velocities, for example in the manner shown in the patent referred to above, so that the matrix will slip to an extent on the sole in accordance with its increased velocity and the skiving operation will be finished more quickly and vwill result in shorter reduced portions.

In :Figure 1 a sole of the largest-size is shown in process of being operated upon, the shank portion being engagedby the feed roll and bent :into :two converging planes theinclinations of which are determined by the inclinations of the ; walls 17, and 19; The tread surface of the sole is being pressed against the walls of the matrix,

and the --skivings are being removed from the flesh side of the sole. "When, however, the operation has been completed and the sole, which 'has been thus progressively distorted is allowed to resume its undistorted condition, a transverse section of itwill appear as in Figure 2 :in 'whichthe grain or tread surface is indicated t at 23. Returning to Figure 1, it will benoted that the thickness of the opposite edges-of the sole will be, equal to the distance along the edges of thesole from the plane of the knife to the adjacent walls of the matrix and that these dis- I j-tances will always be equal to each other since the walls 17, 19 of the matrix converge at the .sameinclination to the plane of the knife, and the :soles are .fed centrally through the matrix.

-Re'ferringnow to Figure 3, wherein a smaller sole is shown in process of being operated upon,

-the matrix sleeve has been adjusted toward the,

knife until the distances along the edges of this all sole from the plane of the knife to the shank portions of soles of shoes of various sizes and of a given style so that their edges will all be of "the same thickness and will all be located at the termination of straight bevels which are all of the same inclination to the tread surfaces of the soles; and when soles of shoes of a diiferent style are to be operated upon, it will be necessary merely to changethe angles of inclinationinto which the 'marginal portions of the soles are progressivelybent.

, Having described my invention, what I claim as new and desire to secure by Letters Patent of the.

United States is:

l. The method of reducing'the opposite edges of the shank portions of a plurality of soles of,

different sizes to the same predetermined thickness by straight bevels of the same angular inclination to the tread surfaces of thesoles, which comprises feeding the soles successively past a knife while progressively holding successive marginal localities of their shank portions bent inconverging planes which extend from the longitudinal middle of said shank portions to said opposite edges, and varying the'distance of the knife from the middle portions of the soles to provide for soles of different sizes.

2. The method of reducing the opposite edges of the shank portions of a plurality of soles of different sizes toithe same predetermined thick ness by straight bevels of the same angular incli-; nation to the treadsurfaces of the soles, which;

comprises feeding the soles successively pasta knife while progressively holding successive marginal localities of their shank portions bent in converging planes which, extend from the; :i20

longitudinal middle of saidshank portions to said opposite edges, and varyingthe distance oft-the knife from the middle portions of the soles in accordance with the Widths :of the various soles.

. ,4 JOHN'SMITH.

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