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Патент USA US2403950

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July 16,'1946.
N. Rosi-:NTHAL "
Filed Feb. 28, 1945
Patented July 16, 1946
Nathan Rosenthal, Newton, Mass.
Aapplication February 28, 1945, .Serial No. 580,191
2 Claims. (Cl. Sii-'76)
My present invention is a novel and improved
shank stiffener for use in the manufacture of
boots and shoes, and is directed particularly to
provide a shank stiffening and arch-supporting
feature with special reinforcements in the arch
supporting portion of the shoe.
Heretofore, it has been customary to make
shank stiffeners of metal which would be ñtted
between the insole and outsole and Would give
a stiffening and reinforcing effect in the arch of
the shoe between the heel and the tread portion
ing element at a diñerent and much sharper
angle, predetermining the contour and form of
the shoe and insole at this lateral arch part and,
hence, affording support to the foot of the wearer.
`It has also been customary to have one or more
arch portions.
Furthermore, by having the lateral arch of
, Thus, my improved shank stiffener has in
herent and added streng-th by reason of the di
vergent arched areas of the longitudinal and the
lateral portions, the line of juncture between the
lateral and the longitudinal differing arc forma
tions constituting i-tself a truss-like effect or rib
which, furthermore, will preferably have a dis
tinct rib formation to predetermine the line- of
of the forepart. Such metal stiffeners were usu
demarcation between the lateral and lengthwise
ally .secured to the heel and extended forwardly
arch and thus constitute a common supporting
in a preformed curve to a sliding engagement at
15 element for both the longitudinal and lateral
the ball or forward portion of the outsole.
longitudinal corrugations or ribs formed in a part
of the shank stiffener to aid in holding the arch
of the shoe in predetermined arc-shape.
less length than that of the lengthwise arch por
tion, I secure the benefit of a full support at the
My present improved arch stiffener constitutes 20 heel and on the ball of the forepart of the shoe
for the lengthwise strengthening part, these being
a double reinforcing structure wherein a :part of
fully equivalent to standard arch supports as at
the arch stiifener comprises a strengthening and
present in use.
reinforcing element longitudinally from the heel
Furthermore, by having one or more reinforc
to the ball of the shoe, and a second preformed
portion with a distinct disaligned arc structure in 25 ing rib structures in the lateral arch itself, great
er strength is added and the predetermined con
the shank stiffener which will automatically effect
tour of the shoe itself is permanently maintained.
a supporting and lifting of the lateral or side por
Referring to 'the drawings illustrating preferred
tion of the arch of the shoe and, hence, consti
tute a support for the side arch portion of the
Fig. 1 is a plan View of my improved shank
foot of the wearer.
stiffener Vwith the longitudinal and transverse
Furthermore, I so arrange and construct my
present improved shank stiffener as to provide
arc-supporting structure;
Fig. 2 is a corresponding plan view illustrating
reinforcing and stiffening convolutions;
defining the area lbetweenthe fore and aft arch
Fig. 3 is a plan view illustrating a modification
and the lateral supporting feature. In order to
of reinforcing convolutions;
secure additional rigidity in the lateral supporting
Fig. 4 is a side View of the shank stiffener of
feature, I provide one or more ribs therein, which
Fig. 1 showing the longitudinal arc contour, and
ribs may be and preferably are of curved contour
Fig. 5 is a diagrammatic view on the line 5-5
and may be either longitudinally or crosswise of
the length of the stiffener. In either case, the 40 of Fig. 1 illustrating the shank stiffener as applied
to the insole on a last illustrating the transverse
side or lateral arc portion of the shank stiffener
arc feature.
gives a vastly greater and increased lateral arch
My shank stiifener may be and preferably is
support to the sole of the shoe in which the
made of metal stamped into longitudinal and
stiffener is fitted, as well as to the foot of the
transverse arc- curves, which may be varied for
wearer, giving a firm support and brace to the
a reinforcing rib member in a curved formation,
the particular style, design, and size of shoe to
which my shank stiffeners are to be fitted. The
Thus, my present stiifener comprises a double
shank stiffeners as shoWn in the drawings are
reinforcing shoe shank stiffener, having one arc
illustrative of a moderate arc contour both longi
formation for the longitudinal or fore and aft
structure of the shoe, and a divergent and dif 50 tudinally and transversely, which arcs can be
greatly increased where desired.
ferent lateral arched contour with reinforce
Referring to Fig. 1, the arch stiifener comprises
ments therein for the side or lateral arch of the
a metal plate l of appropriate length and con
shoe and foot. Thus, my shank stiffener consti
tour and, preferably, stamped from sheet mate
tutes a reinforcing element from the heel to the
forepart, and also a side or lateral arch-support 55 rial having a heel-engaging portion 2 and an op
lateral arch of the shoe.
posite edge portion 3 to engage the ball of the
shoe sole, which portion 3 may beand preferably
is somewhat larger than the heel part, with a
predetermined longitudinal curve from the heel
part 2 lengthwise throughout a substantial width
wise area of the shank stiiîener to the forepart
3. Holes 5 to enable the shank stiffener to be
nailed ñrmly to the heel of the shoe are provided,
and the forepart 3 is preferably unattached and
is allowed to slide slightly to adjust itself to the
contour of the sole and insole during use and to
aid in the flexibility of the shoe at the ball por
tion. The transverse or widthwise arc is prefer
ably formed on the blank during the original
stamping-out action, or it may be shaped and
curved afterwards, and consists in the transverse
arc-shaped area I!) throughout a substantial ex
tent of the length of the shank stiffener.
As shown in Fig. l, this transverse area IU may
be stamped from where the heel part of the shank
stiffener extends over the heel breast of the
shoe, as indicated approximately at I2, Fig. 1,
extending to the extreme forepart of the edge 3, as
shown at I3, and merging into the longitudinal arc
portion of the shank stiifener I on a curved line, 25
curved reinforced convolution or rib 25, and
various modifications of such reinforcing element
will readily occur to those skilled in this art, the
important characteristic of my longitudinal
transverse arch formation being thus maintained
to hold the shoe in exactly the shape and support
ing contour for which it is designed.
As shown in Fig. 5, my shank stiifener is illus
trated as applied to an insole 30 between the
sewing ribs 3I and 32, which insole is illustrated
as positioned on a last 35, the last having a com
plemental cut-away portion 36 to cooperate with
the lateral arc-shaped edge I0 of my improved
shank stiiîener. This construction enables the
foot-supporting portion of the insole to be pre
curved widthwise and to aid in merging the cor
responding part of the insole with the uplifting
adjacent part of the upper materials (not shown).
My shank stiffener may be applied to the insole
before it is fitted to the last or may be applied
afterward but before lasting so as to thus impart
to the insole the initial foot-supporting feature
at the arch of the shoe and, hence, of the foot of
the wearer.
My improved shank stiffener is entirely within
as approximately indicated at I5, which curved
the inner side of the sewing ribs of the insole and
line may be also formed as a stiiîening convo
lution or rib.
shoe and, hence, takes the place of the ordinary
the transverse arc portion IU in reinforced pre- '
a divergent line or curve from the longitudinal
formed contour. Additional ribs 23 and 24 may
be also stamped or otherwise formed in the blank
curve, the side portion being reinforced by ribbed
convolutions extending crosswise of the said side
metal shank stiffener; but in my present im
This rib I5 thus acts jointly to hold both the
proved construction, I provide one or more stiiî
longitudinal arc of the main part of the stiffener 3 0 ening elements, such as ribbed convolutions in
I in its preformed position as well as serving to
the laterally curved part of the shank stiifener,
stiffen and hold the transverse arc portion IIJ in
as distinguished from the longitudinally curved
its preformed position.
portion and any longitudinal ribbed strengthen
My improved shank stiffeners are made for
ing elements. I believe it to be a distinct novelty
“rights” and “lefts” with the transverse arc por 35 in this art to have stiiîening elements in the lat
tion ID adapted to lift the insole and, hence, sup
erally curved or concavo-convex side portion,
port the foot of the wearer on the inner trans
whether such ribbed strengthening elements are
verse arch portion of the shoe and foot, thereby
longitudinally curved or crosswise.
affording a snugger fitting and hugging of the
I claim:
foot, which also facilitates the lasting operation,
l. A metal shank stiifener of the kind de
enabling the shoe upper materials to be drawn
scribed, comprising a longitudinally curved por
down smoother and firmer during lasting,
tion and a laterally extending concavo-convex
In Fig. 2 I have shown a plurality of reinforce
side portion, said side portion being formed in a
ing ribs or convolutions to still further hold and
divergent line or curve from the longitudinal
maintain both the longitudinal and transverse a; curve, the side portion being reinforced.
arc-shaped portions of the shank stiffener in their
2. A metal shank stiiïener of the kind de
predetermined curved position- The longitudinal
scribed, comprising a longitudinally curved por
rib 20 aids in holding the longitudinal arc while
tion and a laterally extending concavo-convex
one or more transverse ribs 2`I, 22, and 23 hold
side portion, said side portion being formed in
during the manufacturing operations.
In Fig. 3 I have illustrated a single lengthwise
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