US 1293337 A
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M. H. CLARK. RUBBER SOLE CANVAS SHOE. APPLICATION FILED NOV. 9. 1915.
1 ,293, 3 37, Patented Feb. 4, 1919.v
WIT/V588 im f/v ron J 1M ymrzb. Clark HIS A TTOR/VEV beti con the upper exerted y the upper UNITED STATES PATENT OFFICE. I
MYRON H. CLARK, F HASTINGS-UPON-HUDSON, NEW YORK, ASSIG-NOR Tb GDODYQEARS COMPANY, CORPORATION OF CONNECTICUT.
METALLIC RUBBER SHOE RUBBER-SOLE canvas SHOE.
Specification of Letters Patent.
Application filed November 9, 1915. Serial No. 60,476.
To all whom, it may concern:
Be it known that I, MYnoN citizen of the United States,
H. CLARK, a residing at Hastings-upon-Hudson, county of VVestchester, State of New York, have invented certain new and useful Improvements in Rubber- Sole Canvas Shoes, of which the following is a full, clear, and exact description.
This invention relates to rubber-selectinvas shoes.
The object of the invention is to provide an article of such footwear in whiclrthe insole is so constructed as to constitute a fulcrum for the upper, so that a portion or the pull of the upper under movements of the wearers foot will be horizontally outward instead of the whole pull being vertically upward, as hitherto. Thus a portion ofthe strain is distributed over the entire united. surfaces of the upper and insole and consequently the line of cement or other securing means between the upper and outsole is relieved of a corresponding amount of strain.
In the ordinary rubbeusole shoe having a fabric upper, such as canvas and the like, the upper is turned inward at the edge over the edge of the insole and cemented firmly to the outsole, the line of cement at the joint and outsole hearing all of the strain ovhen the shoe is flexed in conformingto the movementsv of the wearers foot, so that it eventually is loosened and permits separation of-the upper from the outsole. l y To obviate the above described disadvantage, I extend the insole outwardly farther than. has hitherto been the custom and firmly cement the upper-"to the marginal portion of the insole, sai extended edge forming a fulcrum n -1m v the upper bears and pivots to a certain extent, so that the force in flexing and tending to separate the upper from the outsole, has a component parallel with the insole and there fore is in part transferred from the line of cement between the upper and outsolc to the entire cemented surface between the upper and insole, thus equalizing the strain be tween said cemented surface and said line of cement, and consequently, enhancing the long life of the joint between the upper and outsole.
The invention can be readily understood from the following description taken in corn nection with the accompanying drawing, in which 5 Figure l is a side elevation of a shoe embodying my improvements;
F ig. 2 is an enlarged cross-sectional view of the parts shown in Fig. 1.-
eferring now to the drawings in which like characters of reference designate similar parts, a shoe is shown comprising a fabric upper 10, the edgeof which is turned inwardly and cemented as shown at 11, toa rubber sole 12.
In carrying out the invention, I provide an insole 13, the edge of which is extended as shown at 1% to nearly overhang the edge or the outsole, the bottom'face of the edge of said extended portion being cemented, as shown at 15, to the inturned edge of the fabric upper. A filler which is customarily formed of rag stock is inserted between and secured to the insole and a layer of rubber treated fabric 16' on the bottom face of the filler to enhance union between the filler and outs-ole during' vulcanization.
By extending the edge of the insole as shown, the edge becomes a fulcrum, upon which the upper pivots somewhat so that the pull of the upper is in part exerted in a. direction parallel tothe insole and thus dis tributed, due to 'itsdirection over the entire cemented surface 15 between the insole and upper, thus relieving the line of cement 11 between the upper-and outsole of this portion of the strain which hitherto had been borne solely by said line or cement.
e insole may be stiffened-throughout, or stiffened marginally if desired,
to promote its reslstance to flexing and hence promote a. better fulcrum action of the edge of the sole, but this is not essential, as the insole may be formed as is customary, so long as the edge is extended sufficiently outward to function as a fulcrum for the upper, as above described.
During vulcanization, the union between the rubber outsole and fabric upper and be tween the insole and fabric upper becomes unitary and integral with both parts by setting of the cement, so that a strong watertightjoint exists between the parts. Various modifications may be resorted to, it being simply necessary to the practice of the in vention, that the shoe embody a fabric up- Patented Fen-4, 1919.
per, a vulcanized rubber outsole, and an insole having an extended edge acting as a fulcrum for the upper.
What is claimed is:
5 A shoe comprising a non-vulcanizablo fabric upper, an extemled lrelatirely-Stiff outer sole of rubber gompound, an insole stiffened to promote its resistance to flexing at its margins, the margin of said upper be- 10 ing turned inwardly between said soles a,
layer of rubber cement on each side of said margin of the upper, a filler within the space formed by said soles and the edges of said margin of the upper, and a layer of fabric coated with cement and disposed between the 15 filler and outer sole, said parts being vulcanized thereby combining the coinponen parts into a unitary structure.
Signed at New 'York, N. Y., Nov. (3, 1915.
' MYRON ll. CLARK.