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Патент USA US3089176

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May 14, 1963
A. KAMBORlAN
3,089,166
LAST
Filed Dec. 1, 1961
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BY
ited States
atent
3,089,166
Patented May 14, 1963
2
1
The material used is thermoplastic as distinguished from
thermosetting, is normally solid, and is characterized in
3,089,166
LAST
. 1C6
'
Albert Karnborian, Newton Center, Mass, assignor to
International Shoe Machine Corporation, Boston, Mass,
a corporation of Massachusetts
Filed Dec. 1, 1961, Ser. No. 156,245
8 Claims. (Cl. 12-141)
This invention relates to apparatus for manufacturing
shoes and, in particular, to lasts for receiving an upper
assembly preparatory to lasting.
Conventionally, in the manufacture of ‘shoes, the insole
is temporarily attached to the bottom of the last by
that it ‘can be repeatedly activated so as to become ad
hesive and de-activated to become non-adhesive, that the
period between activation and de-activation may be pre
determined and that the material expands appreciably
upon activation and contracts upon de-a-ctivation.
The
organic thermoplastics which have a high linear coe?icient
of thermal expansion are preferred for this purpose, such
as nylon, ethylene, vinylidene chloride, and the like. An
example of a suitable thermoplastic is a commercial poly
amide resin manufactured and supplied by General Mills,
Inc., under'the name of Versalon XRSOl. Activation of
the thermoplastic is preferably affected by induction heat
means of fasteners, such as tacks, to hold it in place dur
ing lasting of the upper thereto. Constant use of the tacks 15 mg.
In use, an insole 20 is placed upon the bottom surface
for successive shoe making operation eventually destroys
of the last whereupon the last, with the insole thereon,
the bottom of the last and for this reason it is customary
is inserted into a heater. When the material 14 in the
to place removable inserts in the bottom of the last, for
several holes is su?iciently activated to expand the op
receiving the tacks, which may be removed when worn
erator removes the last from the heater and presses the
out and replaced. While this lengthens the life of the
insole 20 against the now adhesive material which holds it
last considerably, driving the tacks and then removing
in contact with the last. The activated condition of the
them involves additional operations which take time and
thermoplastic exists for a predetermined length of time
the hazard of a tack or tacks being inadvertently left in
which may be adjusted by using a suitable composition
the shoe.
so that the insole is held in position for a length of time
25
It is the object of this invention temporarily to attach
su?icient to accomplish that lasting operation. Ulti
the insole to the last with a material which will not leave
a residue on the insole and can be used over-and-over
again without loss of its adhesive characteristics, thereby
eliminating the use of fastening elements which must be
applied and removed prior to and after each lasting op
eration.
This is effected herein by attaching a material to the
bottom of the last which is characterized in that it is
activatable for a predetermined length of time and that,
mately, the material will become de-activated and, by
contraction and loss of its tadhesivenes, pull itself away
from the insole, leaving the latter free as disclosed, for
example, in FIG. 4.
The inserts of thermoplastic are shown in FIG. 1 as
disposed lengthwise of the bottom along the median line,
however, this is not to be considered as limiting as it is
within the scope of the invention to place them laterally
during such activation, it will adhesively hold the insole 35 of the median line and to employ a greater or lesser
to the bottom and upon tie-activation it will become non
adhesive and release the insole. Preferably the material
number of inserts than are shown.
In a less desirable but still operable form of the inven
tion, a thin layer of the thermoplastic material is applied
is further characterized in that it has an appreciable co
to
the entire bottom of the last or only a part thereof.
e?icient of expansion so that it is expanded during ac
tivation into intimate contact with the insole when the 40 The layer is secured to the bottom of the last by a
thermosetting material which adheres permanently and is
not eifected by the activation of the thermoplastic layer.
As described above, the thermosplastic may be repeatedly
as to detach itself therefrom, leaving no residue on the
made adhesive by activation and, after a cooling period,
surface of the insole. Thermoplastic materials are ef
45 become de-activated and non-adhesive and, by its con
fective for this purpose and may be activated for pre-,
traction, relative to its surface contact with the insole,
determined lengths of time by suitable means. The
detaches itself from the surface of the insole leaving the
material may be attached mechanically or by a permanent
latter free.
adhesive.
It should be understood that the present disclosure is
The invention will now be described in greater detail 50
for
the purpose of illustration only and that this inven~
with reference to the accompanying drawings wherein:
tion includes all modi?cations and equivalents which fall
FIG. 1 shows the bottom of the last;
within the scope of the appended claims.
FIG. 2 is an elevation partly in section;
I claim:
FIG. 3 is a fragmentary section of the last, showing
latter is placed against the bottom of the last and when
de-activated contracts, pulling away vfrom the insole so
the thermoplastic lasting adhesive expanded; and
1. The combination with a last for receiving an upper
55 assembly including an insole preparatory to lasting, of
means for releasably holding the insole on the bottom
plastic adhesive de-activated and retracted, releasing the
during the lasting operation, comprising a material secured
last for removal ‘from the lasted shoe.
FIG. 4 is a corresponding section showing the thermo
to the bottom. of the last, said material being characterized
Referring to the drawings, the last 10‘ is provided at
its bottom with a plurality of holes 12, for example 60 in that it is repeatedly activatable without diminution,
that during each activation it will adhesively hold the in
similar to those conventionally employed for receiving
sole to the bottom, and that upon de-activation it will
plugs or inserts of metal, cork, plastic or the like, into
become non-adhesive and will release the insole.
which tacks may be driven to hold the insole on the bot
2. The combination with a last for receiving an upper
tom. In accordance with this invention however a mate
assembly including an insole preparatory to lasting, of
rial 14 is disposed in each hole 12, so that the upper sur 65
means for releasably holding the insole on the bottom
face 16 of the material is slightly below the bottom
during the lasting operation, comprising a material at
surface of the last (FIG. 2). In order to anchor
tached to the bottom of the last, characterized in that it
the material in the hole 12 the wall of the latter is pro
is activatable by heat for a predetermined length of time
vided with indentations 18 which may be circular or
and will become de-act-ivated at the end of said time
thread-like. Optionally, the material 14 can be an 70 and, during activation, it will adhesively hold the insole
chored in a smooth hole by means of a permanent ad
to tlhe bottom and upon de-activation will release the
hesive, for example a thermosetting material.
mso e.
3,089,166
ii
3
3. The combination with a last for receiving an upper
assembly including an isole preparatory to lasting, of
means vfor releasably holding the insole on the bottom
and upon deactivation it contracts into the hole releasing
the insole.
6. A last according to claim 5, wherein the inner surface
during the lasting operation, comprising a material at
tached to the bottom of the last, characterized in that it
is 'activatable by high frequency current for a predeter
the material therein.
7. A last according to claim 5, wherein the material in
of the hole is provided with depressions for anchoring
mined time and it ‘will then become de-activated, that
the holes has a relatively high linear coe?‘icient of expan
during such activation it will adhesively hold the insole
to the bottom and upon de-activation will release the in
sion.
sole.
‘
8. The combination with a last for receiving an upper
10 assembly including an insole preparatory to lasting, of a
4. The combination with a last for receiving an upper
substantially permanently reuseable layer of thermoplastic
assembly including an insole preparatory to lasting, of
material applied to at least a portion of the ’whole of the
substantially permanently reuseable means for releasably
bottom surface by means of a thermosetting adhesive, said
holding the insole on the bottom during the lasting opera~
thermoplastic layer being characterized in that it is re
tion, comprising a material attached to the bottom, char 15 peatedly activatable without diminution, that during acti
acterized in that it is repeatedly activatable without
vation it expands and becomes adhesive and that when
‘diminution, that it expands during activation and becomes
d'e-activated it becomes non-adhesive and contracts.
adhesive, and that it contracts during de-activation and
References Cited in the ?le of this patent
becomes non-adhesive.
5. The combination with a last vfor receiving an upper 20
UNITED STATES PATENTS
assembly including an insole preparatory to lasting having
a plurality of holes in its bottom, of an activatable ma
terial ?lling each hole, the upper surface of which is situ
ated slightly below the level of the bottom of the last,
characterized in that, when activated, it expands so as to 25
project from the hole into adhesive contact with the insole
1,365,2’21
Blake ________________ __ Jan. 11, 1921
2,893,026
Sillars et al _____________ __ July 7, 1949
782,690
Great Britain _________ __ Sept. 11, 1957
FOREIGN PATENTS
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