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Патент USA US2404805

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Ju?y 3, E4.
I v. J. LEVAGGH, JR
29949805
TWO-PART COLLAPS IBLE LAS‘T
Filed July 10, 1945
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Inventor
Victor-J Levaggi Jr
By his Attorney‘
JMiMWAg
2,404,805
Patented July 30, 1946
UNITED STATES PATENT OFFICE
2,404,805
,
TWO-PART COLLAPSIBLE LAST
Victor J. Levaggi, Jr., Beverly, Mass., assignor to
United Last Company, Portland, Maine, a cor
poration of Maine
Application July 10, 1945, Serial No. 604,119
14 Claims. (01. 12-136)
1
Patent Serial No. 555,434, ?led September 23,
Fig. 2 is a sectional view. indicated byline
II--II in Fig. 1; and
Fig. 3 is a side elevation of the preferred form
of resilient member for connecting the forepart
and the heel part, broken lines indicating the
1944, now issued as Patent No. 2,386,868, dated
October 16, 1945. A last of. this type comprises
manner in which its shape is altered by ?exure
incidental to latching andunlatching one of the
a forepart and a heel part each provided with a
links.
The purpose of this invention is to provide
improvements in two-part, two-pivot collapsible
lasts in some respects similar to the type illus
trated in my application for United States Letters
‘
‘
For the sake of economy a last‘ of this type is
a latching pin, a coupling link connecting the 10 ?rst turned all in one piece‘ and subsequently
pivot pin and the heel ‘part also provided with
pivot pins, and means for automatically latching
the forepart and the heel part in their last-form
ing relation.
One of the improvements provided by the pres
ent invention is embodied in counterpartal for
mations, one on the joint surface of the heel part
and the other on that of the forepart, the one
on the heel part being a truncate wedge-shaped
ridge extending widthwise of the last, and the
divided by oblique saw-cuts to provide a iorepart
Ill and a heel part ll. One saw-cut 12 extends
a short distance from the bottom of the last
15
toward the instep, and another cut l3 extends
a longer distance from the instep‘toward the
cut [2.
These cuts do not quite meet but are
offset in different oblique planes, and the wood
between their terminal points is‘broken to com
plete the dividing and provide the parts with
other being a wedge-shaped recess or valley to 20 cooperative sloping shoulders, I4, I41: adapted
to register them in last-forming relation. The
receive the ridge and to engage both of its con
cut l3 may be made with a narrow band-saw
verging shoulders when the parts are drawn one
and may follow a course‘ that will produce slop
against the other by the connecting means. The
ing shoulders l5, I592, one on the heel part and
interlocking of the ridge and the valley not only
insures positive register of the forepart and the 25 the other in the forepart, but these shoulders
will be rounded to permit one to ride easily over
heel part in their last-forming relation, but it
the other as the last is collapsed.
‘
also relieves the connecting hardware from all
The shoulders i4 and I5 on‘the heel part de?ne
torsional stresses encountered in certain pres
a truncate wedge-shaped ridge 23 that extends
sure-applying machines through which some
widthwise, while the shoulders Ma: and I53: in the
shoes pass during their process of manufacture.
forepart de?ne a wedge-shaped valley 24 in which
Another improvement is embodied in a mem
the ridge may be nested. Since no wood is‘re
ber having two ?exible, resilient arms adapted
moved in producing the shoulders M and 140:,
to be ?exed away from each other, one of the
both shoulders of the ridge may be seated against
arms constituting a link for coupling the two
the shoulders of the valley, and thereby register
pivot pins, and the other constituting a latching
the forepart and the heel part in true relation
link for connecting the pivot pin in the iorepart
despite torsional stresses tending to twist them
and the latching pin in the heel part when the
out of register. The connecting member about
parts are in their last-forming relation.
to be described is not subjected to torsional
The two-armed member is preferably made of
stresses, since the ridge and valley shoulders sus
a single piece of spring wire having a series of
tain those stresses so long as the connecting
return bends one of which connects the coupling
link and the latching link and provides an eye
or loop adapted to extend around and engage
the pivot pin in the forepart. This bend is also
?exible and resilient, and these qualities, com
pounded with those of the links, provide an ag
gregate spring length so great as to permit using
spring wire of a size that will withstand the
buckling stresses‘ to which a last may be sub
jected in shoe machines of one type or another.
Referring to the drawing,
Fig. l is a side elevation, partly in section, of
a two-pivot collapsible last embodying the inven
tion, broken lines indicating the position to which
the iorepart may be moved to collapse the last;
member maintains the shoulders in contact with
each other. This member is preferably made of
a single piece of spring steel wire of elliptical
section having an arcuate return bend 25, at one
end, an arcuate return bend 26 at the other end,
an eye portion formed by an arcuate return bend
21, and a latching shoulder 28 formed by an
abrupt bend between the eye portion 21 and the
terminal bend 26.
The forepart is bored widthwise to provide a
hole for a pivot pin I6, and the heel part islike
wise bored to provide two holes, one for a pivot
pin l1 and the other for a latching pin [8. The
pins l6 and I8 are so located that a line inter
2,404,805
3
secting them will lie between the shoulders l4
and It. The pin l6 bridges a heightwise kerf
IS in the forepart and the pins l7 and i8 bridge
4
resilience of the arm 30 again draws the fore
part and heel part one against the other.
To collapse the last it is necessary, ?rst, to
a registering kerf 28 in the heel part. The kerf
?ex the latching link to the positionindicated
20 extends to a last-pin socket 21 in the heel
by broken lines in Fig. 3, and thereby release
part for a purpose hereinafter explained but also
the pin Hi from the shoulder 28. The forepart
set forth in the application above mentioned. A
may then be shifted to the position represented
slot 22 in the front Wall of the socket affords
by broken lines in Fig. 1. When it, has been
access to ‘the kerf 20 from the interior of the
shifted far enough to place the pin IS on the
socket.
10 step 3| between the shoulder 28 and the bend 26
The connecting member occupies the kerfs I9
re?ex action of the connecting member against
and 20 ; the bend 25 thereof extends around and
the pin [8 will complete the shifting if the last
engages the pivot pin l1; and the bend 2,‘! ex
be unshod, or, at least, tend to do so if the last
tends around and engages the pivot pin Hi. The’
is con?ned in, a shoe. In either event, the step
arm portion 29 connecting the bends 25 and 2“! 15 3-! will react against the latching pin and slide
possesses some ?exibility and resilience, and the
thereon.
arm portion 3!] connecting the eye 2] and. the.
The slQt 22 in the socket 2| permits an imple
shoulder 28 also possesses some ?exibility and,
ment such as a‘ screw-driver to be inserted
resilience, while the eye 21, itself, possesses the
through the socket and into engagement with the
same qualities in some degree. These qualities 20 outcurved surface of the bend 26. Such an im
enable the arm portion 38 to be ?exed away
plement may be used to pry the latching link
from the arm portion 29 in the manner indicated
away from the coupling link and thereby trip the
by broken lines in Fig. 3.
a
latch, and in doing so it will reduce the curvature
of the arm 3i! slightly and thereby increase the
tute a coupling link, while» the arm 30, the bend 25 length of the latching linkfin a corresponding. de-:
2i‘! and the shoulder 28 constitute a spring-loaded
gree to disengage the shoulder 28. from the pin l8.
latching link. The latching shoulder faces the
Conversely, when the, parts l0 and H are shifted
eye portion 2'! and is adapted to hook the latch
from sollapsed relation to last-forming relation
ing pin l8 (Fig. 1)- when the. parts It and H. are
the pin. it and the step. 3.! will cooperate to. ?ex,
in last-forming relation. Moreover, the arm 30 30 the latching link away from the coupling link.
has a ‘curvature of long radius which normally
Here, also, the ?exing stress will reduce. the cure
The arm 29v and the bends 25 and 2'! consti
draws the shoulder 28 toward the eye 2-‘! but
vature of the, arm 311 enough to. permit. the latch.
permits it to be sprung. away from the latter in
ing shoulder 28 to snap over and catch, the pin is,
consequence of reducing the curvature. The ef
fective length of‘ the arm 30 is thus rendered
normally contractile but. capable of being ex
tended under stress. The» results afforded by this
feature are hereinafter explained.
The arms 29 and 30, when relaxed, extend in
whereupon. the arm 30 will resume. as. muehor its
normal curvature as. the bins. l6 and [twill per:
mit, and thereby drawv the parts I Q and. U against:
each other.
Having describedmy invention. whatl claim as
new and desire to secure by Letters Patentci the.
the same general direction from the eye. portion 40 United States is:
'
i
21, and the pins I1. and i8 are-s0 spacecLone from
1. Atwo-part last comprising a forepart and a
they other, that it is necessary tov spring the arms
heel part having abutting».- oblique joint surfaces,
slightly away from each other to assemble the
the abutting portion of the heel part including a
last. The effective length of the coupling link is
truncate wedge-shaped, ridge having sloping
4.5 shoulders, and extending widthwise, the ‘abutting’
quired by the pivot pins 16 and i‘! when the parts
portion of the forepart including a wedge-shaped
are in last-forming relation, but. the range of lost
valley extending widthwise to receive said ridge
preferably a little greater than the minimum reg
motion thus. provided is less than the elastic
‘ range of the latching link.
At the same time
and thereby register the parts, in last-forming,
relation, each of said parts also having a kerf ex
the spacing of the. pins [6. and i8 is great enough 50 tending heightwise and intersecting its wedge
to resist the contractile force. of the latching
shaped formation, a pivot pin bridging the kerf in
link. Consequently, the joint surfaces of. the
one of- said parts, a latching
bridging the kerf
forepart and heel part are normally pressed
in thefother one of said parts, and a spring-loaded
link arranged in said kerfs, the link being piv
against each other by that same contractile
force.
otally mounted on said pivot pin‘ and having] a
latching shoulder arranged to hQQkfsaid latching
If, now, the last were subjected to the buckling
pin when said ridge is nested in said valley.
stress of a cement. soleeattaching machine. or a
2. A twoepart last comprising a forepart and a
sole-leveling machine the. cone of‘ the heel part
heel part having abutting oblique joint surfaces,
would be supported by one rest, the toe would
be supported by another rest, and the pressure 60 the abutting portion of the. heel part including a
- against the bottom of the last between its points
of support might be so great- as to open a crack
truncate wedge-shaped ridge having sloping
shoulders and extending widthwise, the abutting
portion of the forepart including a wedge-shaped
between the cone portions of the iorepart and
valley extending widthwise to receive saidridge
heel part. Under these conditions the curvature
and thereby register the parts in last-forming re->
of the arm 39 will enable the latching link to 65. lation, each of‘ said parts also having a kerf ex- <
yield to the demands of the buckling stress with
tending heightwise and intersecting its, wedge
out overloading or unbending the latching shoul
shaped formation, a pivot pin bridging the‘kerf»
der, and the distance between the pivot pins l6
in the forepart, ‘a pivot, pin, bridging the kerf in
and I‘! may be increased only to an extent limit
the heel part, a coupling link, connecting said
ed by the effective length of the coupling link. 70 pivot pins to guide said ridge- into. and out. of saidv
The latter will then assist the latchng linkv in
valley, and latching means located in said kerfs
sustaining the buckling stress, andthereby save
and arranged to lock' the forepart and the heel
the latching shoulder; from being; unbent. When
part, one against the other when said ridge is.
the buckling stress is taken Off. or nearly so, the. 75 nestedin saidvallex.
'
'
3
2,404,805
,
5
,
A'two-part last comprising a forepart, and a
heel part having abutting oblique joint surfaces,
the abutting portion of the heel part including
a" truncate wedge-shaped ridge having sloping
shoulders and extending widthwise, the abutting
portion of the forepart including a wedge-shaped
valley extending widthwise to receive said ridge
and thereby register the parts in last-forming re
6
having a latching shoulder facing said eye por'—
tion and arranged to hook said latching pin when
the parts are in last-forming relation.
7. A two-part,'two-pivot collapsible last com
prising a forepart and a heel part having abut
ting joint surfaces including cooperativeishoul
ders arranged to register the parts heightwise in
last forming relation, each of said parts also
having a kerf extending heightwise in its joint
lation, each of said parts also having a kerf ex
tending heightwise and intersecting its wedge 10 portion, a pivot pin bridging the kerf in the fore
shaped formation, a pivot pin bridging the kerf
part, a pivot pin and a latching pin each bridg
in one of said parts, a latching pin bridging the
kerf in the other one of said parts, and a spring
loaded link arranged in said kerfs, the link being
ing the kerf in the heel part, and a spring hav
ing two resilient arms and an eye portion con
necting them, said spring being located in said
pivotally mounted on said pivot pin and having a 15 kerfs and said eye portion being located in the
latching shoulder arranged to hook said latching
forepart, one of said arms and said eye portion
pin when said ridge is nested in said valley, and
connecting said pivot pins, and the other arm
said pins being’so located that a line intersecting
having a latching shoulder facing said eye por
them when the ridge is nested in the valley will
tion and arranged to hook said latching pin when
also intersect the ridge.
‘
20 the parts are in last-forming relation, said other
4. A two-part last comprising a forepart and a
portion of the forepart including a wedge-shaped
arm being flexible and normally curved between
the latching shoulder and said eye portion, and
the effective length thereof being thereby ren
dered contractile and extensible.
8. A two-part, two-pivot collapsible last com
prising a forepart and a heel part having abut
valley extending widthwise to receive said ridge
ting joint surfaces including‘ cooperative shoul~
heel part having abutting oblique joint surfaces,
the abutting portion of the heel part including‘a
truncate wedge-shaped ridge having sloping
shoulders and extending widthwise, the abutting
and thereby register the parts in‘ last-forming
relation, each of said parts also having a kerf ex
ders arranged to register the parts heightwise in
last-forming relation, each of said parts also hav-“
tending heightwise and intersecting its wedge 30 ing a kerf extendingheightwise in its joint poi»
shaped formation, a pivot pin bridging the kerf
tion, a pivot pin bridging the kerf in the fore
in one of said parts, a latching pin bridging the
part, a pivot pin and a latching pin each bridg
kerf in the other one of said parts, and a spring
ing the kerf in the heel part, and a spring hav
loaded link arranged in said kerfs, the link being
ing two resilient arms and an eye portion con
pivotally mounted on said pivot pin and having a
necting them, said spring being located in said
latching shoulder arranged to hook said latching
kerfs and said eye portion being located in the
pin when said ridge is nested in said valley, said
forepart, one of said arms and said eye portion
pins being so located that a line intersecting them 7
connecting said pivot pins, and the other arm
when the ridge is nested in the valley will lie be
having a latching shoulder facing said eye por
tween the shoulders of the ridge, and said link
tion and arranged to hook said latching pin
being resilient and contractile to draw said pins
when the parts are in last-forming relation, said
toward each other.
other arm having a free end beyond and extend
5. A two-part last comprising a forepart and
ing from said latching shoulder to engage said
a heel part having abutting oblique joint sur
latching pin when the last is collapsed and by
faces, the abutting portion of the heel part in 45 such engagement to ?ex that arm as the parts
cluding a truncate wedge-‘shaped ridge having
are relatively moved toward their last-forming
sloping shoulders and extending widthwise, the
relation.
abutting portion of the forepart including‘ a
9. A two-part, two-pivot collapsible la'st com
Wedge-shaped valley extending widthwise to re
prising a forepart and a heel part having abut
ceive said ridge and thereby register the parts in 50 ting joint surfaces including cooperative shoul
last-forming relation, each of said parts also
ders arranged to register the parts heightwise in
having a kerf extending heightwise and inter
last-forming relation, each of said parts also hav
secting its wedge-shaped formation, a pivot pin
’ ing a kerf extending heightwise in its joint por
bridging the kerf in the forepart, a pivot pin and
tion, a pivot pin bridging the kerf in the fore
a latching pin located one above the other and 55 part, a pivot pin and a latching pin each bridg
each bridging the kerf in the heel part, a cou
pling link connecting said pivot pins to guide said
ing the kerf in the heel part, and a spring con
sisting of a single piece of spring wire forming
ridge into and out of said valley, and a latching
two arms and an arcuate return bend connecting
member carried by said pin in the forepart and
them, said spring being located‘in said kerfs and
having a shoulder arranged to hook said latch 60 said return bend extending around and engag
ing pin when said ridge is nested in said valley.
ing said pin in the forepart, one of said arms
6. A two-part, two-pivot collapsible last com
having a return bend extending around said pivot
prising a forepart and a heel part having abut
pin in the heel part, and the other one of said
ting joint surfaces including cooperative shoul
arms having a step and an intermediate bend
ders arranged to register the parts heightwise in 65 forming a latching shoulder arranged to catch
last-forming relation, each of said parts also
said latching pin when the forepart and the heel
having a kerf extending heightwise in its joint
part are in last-forming relation, said step being
portion, a pivot pin bridging the kerf in the fore
arranged to exert pressure against said latching
part, a pivot pin and a latching pin each bridg
pin when the last is collapsed.
ing the kerf in the heel part, and a spring hav 70
10. A connecting member having an arm and
ing two resilient arms and an eye portion con
two pivoting portions at opposite ends thereof
for coupling two pivot pins in the forepart and
necting them, said spring being located in said
heel part, respectively, of a collapsible last, said
kerfs and said eye portion being located in the
member also having a ?exible ‘and resilient arm
forepart, one of said arms and said eye portion
connecting said pivot pins, and the other arm 75 provided with a latching shoulder, said arms be
'
2,404,805
7
ing connected by one of said pivoting portions.
11. A member for connecting; the forepart and
13. A member for connecting the forepart and
the heel part of a two-pivot collapsible last, said
member consisting of a single piece of spring
Wire forming two ?exible resilient link portions
and an arcuate return bend connecting them in,
the heel part of a two-pivot collapsible last, said
member consisting of a single piece of spring wire
forming two ?exible arms andan arcuate return
bend connecting them and adapted to extend
series and adapted to extend around and engage
around and engage a pivot pin in one of the parts,
a pivot pin in one of the parts, said link portions
the free end of one of said arms having a bend
extending in’ the same general direction from
adapted to extend around and engage a pivot pin
opposite ends of said bend, each of saidlink por-i‘
in the other part, and the other one of said arms 10 tions having a return bend at its free end and one
having a, bend forming a latching shoulder adapt
of them having an intermediate bend forming a
ed to cooperate with a latching pin in said other
part, said arms being relatively movable toward
and from each other to effect latching and un
14. A member for connecting the forepart and
the heel part of a two-pivot collapsible last! said
' 12. A member for connecting. the forepart and
wire forming two ?exible resilient link portions
latching shoulder facing said connecting bend.
latching.
member consisting of a single piece of spring
the heel part of a two-pivot collapsible last, said
member consisting of a single piece of spring wire
forming two ?exible resilient link portions and
an arcuate return bend connecting them in series
and an arcuate return bend connecting them in
series and adapted to extend around and engage
a pivot pin in one of the parts, said’ link portions
extending in the same general direction from
opposite ends of said bend, one of said link por
and adapted to extend around and engage a pivot
pin in one of the parts, said link portions ex
tending in the same general direction from oppo
site ends of said bend, the free end of one of said
link portions having a return. bend adapted to
extend around and engage a pivot pin in the
other part, and the other link portion having a
bend forming a latching shoulder facing said
connecting bend, said link portions being rela
tively movable toward and from each other to
e?ect latching and unlatching.
‘
tions being considerably longer than the other
and having a return bend at its free end and an
intermediate bend forming a‘ latching shoulder
facing said connecting bend, and the shorter one,
of said link portions having a return bend at its
free end adapted to extend around and engage a
pivot pin in the other one of the parts.
30
VICTOR. J. LEVAGGI, vJR.
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