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:Sept 17, `1946.
"
M_ v, ARNQLD ET AL
ì
2,407,806
APPARATUS FOR APPLYING TREAD MATERIAL To TIRE CAsINGfsv
Filed May 21, 1945 `
'
@Mêwêm
Patented Sept. 17, 1946
2,407,806
UNITED STATES PATENT OFFICE>
l2,407,806
APPARATUS FOR APPLYING. TREAD,
MATERIAL TO TIRE CASINGS
1
Mervin. V- Arnold, Clay, N. Y., and James. W
Napier, Macon,
Application May 21, 1943, Serial No. 487,946.
11 Claims.
(Cl, 187-18)
1
2
This invention relates tQ means for retreading
worn pneumatic tire casings or, if desired, for
to correspondingly Spread apart the easing side
walls I3.. In this. connection and es, illustrated
applying original tread material to new tire cas
ings either during course of their manufacture
or at any time following their manufacture as
commercial products, and has for its general ob
ieet to provide a simple. practical means whereby
tread; material may be applied te either worn or
new pneumatic tire oasinss. rapidly. expeditiously,
at, low cost and in a dynamically balanced ,man1
ner.
by way of example in the drawing, the members
Ul
le, lil’ may bein the formA cf solid, circular disks
of metal or other Suitable material each having
an annular, peripheral flange I5 projecting oui.
wardly from its inner side portion for engage:
ment with the inner side face of the related bead
portion IIÀ of the tire casing I2 and each’ having
its outer side portion I6, at least adjacent to the
flange I5, of a diameter to lit snugly into the
With the foregoing general object in View the
invention consists in the novel features of con
struction, Combination and arrangements of; the
related bead portion I I to maintain the .c_:ircularv
form thereof. Preferably the outer side portions
I6 of said disks are tapered outwardly, asshown,
means, as will be hereinafter more fully de
to facilitate their engagement in the bead por
scribed, illustrated
the accompanying drawing`
and defined in the appended claims,
`In the accompanying drawing, wherein like
characters ofl reference denote corresponding
tions II, but this is not essential and the said
outer portions of said disks may be of cylindri
cal or any other desired form. In any event, it
will be understood that pairs of the members
parts in the different Views;
20 It), I0’ of different diameters Vor sizes are pro
Figure 1 is a central, longitudinal sectional
vided for use with tire casings of different diam
view through a worn tire casing and through
eters or sizes.
means constructed in accordance with one prac
While any suitable means may be providedl for
tical embodiment of the invention for spreading
moving apart or separating the members Il), i0?,
apart the side walls of said casing to reduce the 25 an arbor, such as th'e arbor I4., preferably is em-4
outside diameter of the latter7 this View showing
ployed for this purpose because it is a. simple,
by full lines the casing side walls spread apart
practical means for the purpose and also because
by said. means, a retreading band of material
it affords a simple, practical instrumentality of
applied to the worn peripheral portion of the cas-Y
mounting the tire casing for rotation. As illus->
ing and a mold operatively positioned around the 30 trated in the drawing, the arbor I4 is of hollow
casing and, by dotted lines, retracted positions
or tubular form and at one end has swivel or ro
of the casing side walls and the casing with the
retreading material thereon expanded into the
mold; and
tary abutting engagement with the inner side of
the member I_,ß’ centrally thereof, as indicated at
I1. In addition, it is externally threaded and
Figure 2 is a View similar to Fig. 1 showing the 35 has the member IQ centrally- threaded thereon.
tire casing expanded into the mold and opera
Thus, assuming non-rotation of th'e members I0,
tively mounted, through' the instrumentality of
I6', it is apparent that by rotating said arbor
the side Wall spreading means, upon a shaft for
in one direction said members will be forced
rotation by the latter.
~
apart, while by rotating the same inthe oppo
Referring now in detail to the accompanying 40 site direction said members will be permitted to
drawing which is illustrative of one practical
move together or approach each other.
means for practicing the present invention, Ill,
Following operative engagement of the mem.
IU’` designate a pair of members to be suitably
bers I0, Iß’ with the bead portions of a tire
engaged with the bead portions II, II of aA tire
casing I2 in the manner shown in the drawing,
casing I_Z, and to be moved apart or separated for 45 said members are moved apart by rotation of
the purpose of spreading apart the side walls I3,
the arbor I4 or in any other desired manner to.'
I3 of said casing to reduce the outside diameter
spread apart the side walls I3, I3 of the said cas
thereof, and I4 designates an arbor operatively
ing and thereby reduce the outside diameter
associated with said members Ill, l0’ and aff
thereof, as shown by full lines in Fig. 1. Subse
fQl’dîng a means of spreading them apart.
quently to or following this operation, a band I8
Preferably the members IQ, Ill’ are of suitable
of uncured or unvulcanized natural or synthetic
design to ñt into the casing bead portions II, II
retreading rubber or its equivalent is applied to
t0 maintain the circular form thereof and to
the peripheral portion of the tire casing. Then,
engage the inner side faces of said bead portions
while the side walls of the tire lcasingV remain
so that when they are spread apart they serve n
spread apart and saidr casing is of reduced out
2,407,806
4
3
side diameter, an annular mold I9 is engaged
over said casing or, alternatively and equivalent
ly, the casing is placed in said mold. The arbor
I4 then is rotated in a direction either to move
th‘e members I9, IU’ toward one another or to
permit them to move toward one another under i
the influence of the force exerted inwardly there
on by the spread apart side walls of the tire cas
ing tending to return to their normal positions,
and this inward moving of said members is con
tinued until the tire casing, with the vband I8
of tread material thereon, has expanded to or
substantially to its normal diameter into tight
ing to densify the tread material and to cause it
to conform in cross section to the cross sectional
configuration of the space between the periphery
of the casing and the mold is that the tread ma
terial inherently tendsV to become dynamically
balanced under the centrifugal force generated
by rotation of the casing. Moreover, it is ap
parent that, Vif desired, liquid or solid matter
may be introduced into any given casing to as
sist centrifugal force in urging the casing out-V
wardly to subject the applied tread material to
the desired pressure between the casing and the
mold.
engagement with the mold I9, but is stopped prior
~ From the foregoing description considered in
to complete return of the> casing side walls to „
connection with the` accompanying drawing, it is
their normal positions so that the members I0,
believed that the novel features and the decided
I0’ remain ñrmly engaged with the beads I I, I I.
The arbor I4, with the members I0, I0', the
advantages of the present tire casing retreading
means will be readily understood and appreciat
ed. It is desired to point out, however, that the
tire casing I2 and the mold I9 assembled there
with, then is slipped over a rotatable shaft 20 20 invention is not limited to the specific Lmethod
steps> nor to the structure specifically illustrat
and is fastened thereto for rotation therewith
ed and described, but may be practiced by vari~
in any suitable manner as, for example, by ab-ut
tingthe outer face of the central >or hub portion
ous specifically different structures, all within its
spirit and scope as deñned in the appended
of the member I0' with a suitable abutment 2I
on the shaft 20 and by threading a clamp nut 22
claims. -f
on the shaft 20 tightly against the outer end of
We claim:
the arbor I4.
, 1. Apparatus of the character described com- ,
1
prising a rotatable hollow arbor to be engaged
After the arbor I4 has been fastened to the
shaft 29 by the clamp nut 22 or in other appro
over and secured to a rotatable shaft for rota
priate manner, heat is suitably applied to the 30 tion by the latter, a pair of members supported
mold I9 and through said mold to the band I8
by said arbor ooaxially therewith’for rotation
ofV tread material t0 effect Vulcanization thereof
and to cause it to become firmly joined to the
therewith, said members having portions for en
gagement with the inner edges o-f the bead por
worn peripheral portion of the tire casing and,
tions, respectively, of a tire casing to mount the
simultaneously, the shaft 29 is rotated to rotate 35 casing upon said members and 'said arbor con
the tire casing and the mold at a sufficiently rapid
rate of speed to cause the retreading material,
under the thus generated centrifugal force, to
densify and to conform closelyv to the contour
centrically with respect to the latter for rotation
therewith, said members further having portions
tread material and to cause it to become firmly
joined to the tire casing, whereupon the heat is
and toward the other member to spread apart
and to release for contraction the side walls of
fixed with respect thereto for engagement with
the inner faces of the side walls of a tire casing
of the inner face of the mold.
,
40 mounted upon said members whereby relative
Rotation of the tire casing and the mold and
.outward movement of said members is effective
application of heat to the mold are continued
to 'spread apart the side walls of the casing, and
over the required period of time to accomplish
at least one of said members being mounted upon
said arbor for movement therealongl away from`
proper densiñcation and vulcanization of the
Y cut off, rotation of the shaft 20 is discontinued
and disassembly of the mold from the tire cas
ing and of the tire casing from the members I9,
a tire casing mounted upon said members.>
2. Apparatus of the character described com
prising a rotatable exteriorly threaded hollow
I0’ is effected in a manner just the reverse of 50 arbor to be engaged over and secured to a ro
the manner of assembly of these elements or in
tatable shaft for rotation by the latter, a pair
any other suitable manner. The apparatus then
of member-S supported by Isaid arbor coaxially
is in readiness for the next tread applying series .
therewith for rotation therewith, said members
of operations.
having portions for engagement with the inner
,
edges of the bead portions,'respectively, of a tire
casingv to mount the casing upon said members
and said arbor concentrically with respect tothe
For example, it may be the armature shaft of
an electric motor 23 as illustrated in Fig. 2 of
latter for rotation therewith, said members fur
ther having portions for engagement with the
the drawing. Likewise, any suitable means may
be provided for heating the mold I9. For ex 60 inner faces of the Iside Walls of a tire casing
ample, suitable electric resistance or heater ele
mounted upon said members, and at least one
ments 24 may be suitably carried by said mold
of vsaid members being threaded upon said arbor
for movement therealong away 'from and ‘to
and current may be supplied to said elements in
ward the other member to spread apart and -to
any suitable manner, as from a suitable source
through conductors 25 to slip rings 26 on and
release for contraction the side walls of a tire
casing mounted upon said members.»
insulated from the shaft 20 and from said slip
3. Apparatus ofthe character described com#
äiïngs to said elements through other conductors
prising a rotatable 'exteriorly threaded hollow
To facilitate rotation of the arbor I4 the same
arbor to be engaged over and secured to aro
may be suitably formed at its outer end for en 70 tatable shaft for rotation by the latter, a pair
The shaft 29 may be rotated manually or it
may be power driven in any suitable manner.
gagement of a wrench therewith or, as shown,
it may be provided with an eye element 23 to
have engaged therewith the equivalent of a
wrench in the form of a rod or the like.
- A distinct advantage of rotatingv a tire Cas,
of disks >supported by said ,arbor coaxially there
with for rotation therewith and to fit snugly
into the bead portions, respectively, of a tire cas-ing yto mount the casing upon said disks and said
75 arbor concentrically with respect to the latter
2,407,806
5
6
for rotation therewith, said disks having mar
ber-s whereby relative outward movement of saidA
members is effective to spread apart. the side
ginal flanges for engagement with the inner side
faces of the bead portions of a tire casing mount
walls of the casing, and at least one of said mem
ed upon said disks, and at least one of said disks
bers being mounted upon said arbor for move
being threaded upon said arbor for movement
ment therealong away from and toward the other "
therealong away from and toward the other disk
member to Ispread apart and to release for con
to spread apart and to release for contraction the
traction the side walls of a tire casing mounted
'side walls of a tire casing mounted upon said
upon said members.
disks.
9. Apparatus of the character described com
4. Apparatus of the character described corn 10 prising a. rotatable shaft, a rotatable exteriorly
prising a rotatable hollow arbor to be engaged
threaded arbor, means to mount said arbor upon
over and secured to a rotatable shaft for rota
said shaft coaxially therewith for rotation by
tion by the latter, a pair of disks supported by
the same, a pair of members supported by said
said arbor coaxially therewith for rotation there
arbor coaXially therewith for rotation therewith,
with, the peripheries of said disks being outwardly
tapered to fit snugly into the bead portions, re
spectively, of a tire casing to mount the casing
upon said disks and said arbor conoentrically with
respect to the latter for rotation therewith, said
disks having marginal flanges for engagement 20
said members having portions for engagement
with the inner edges of the bead portions, re
spectively, of a tire casing to mount the casing
upon said members and said arbor concentrically
with respect to the latter for rotation therewith,
said members further having portions for en
with the inner faces of the bead portions of a
gagement with the inner faces of the side walls
tire casing mounted upon said disks, and at least
of a tire casing mounted upon said members,
»one of said disks being mounted upon said arbor
and at least one of said members being thread
for movement therealong away from and toward
ed upon said arbor for movement therealong
the other disk to spread apart and to release for 25 away from and toward the other member to
contraction the side walls of a tire casing mount
spread apart and to release for contraction the
ed upon said disks.
side walls of a tire casing mounted upon said
5. Apparatus of the character described com
members.
prising a rotatable eXteriorly threaded arbor, a
10. Apparatus of the character described corn
pair of members supported by said arbor coax 30 prising a rotatable shaft, a rotatable eXteriorly
ially therewith for rotation therewith, said mem
threaded arbor, means to mount said arbor upon
bers having portions for engagement with the
said shaft coaXially therewith for rotation by the`
inner edges of the bead portions, respectively, of
same, a pair of disks supported by said arbor
a tire casing to mount the casing upon said mem
coaxially therewith for rotation therewith and
bers and said arbor concentrically with respect
to ñt snugly into the bead portions, respectively,
to the latter for rotation therewith, said mem
of a tire casing to mount the casing upon said
bers further having portions for engagement
disks and said arbor concentrically with respect
with the inner faces of the side walls of a tire
to the latter for rotation therewith, Isaid disks
casing mounted upon said members, one end of
having marginal flanges for engagement with
said arbor abutting one of said members and the 40 the inner side faces of the bead portions of a
other of said members being threaded upon said
tire casing mounted upon said disks, and at least
arbor for movement therealong away from and
one of said disks being threaded upon said arbor
toward said first mentioned member to spread
for movement therealong away from and toward
apart and to release for contraction the side walls
the other disk to spread apart and to release for
of a tire casing mounted upon said members.
contraction the side walls of a tire casing mount
6. Apparatus as set forth in claim 5 in which
ed upon said disks.
the arbor is hollow to be engaged over and to be
ll. Apparatus o-f the character described com
secured to a rotatable shaft for rotation by the
prising a rotatable shaft, a rotatable arbo-r, means
latter.
to mount said arbor upon said shaft coaxially
7. Apparatus as set forth in claim 5 including 54) therewith for rotation by the same, a pair of disks
a rotatable shaft, and means to mount the arbor
supported by said arbor coaxially therewith for
thereon co-axially therewith for rotation by the
rotation therewith, the peripheries of .said disks
same.
‘
being outwardly tapered to iit snugly into the
8. Apparatus of the character described com
bead portions, respectively, of a tire casing to
prising a rotatable shaft, a rotatable arbor, means , mount the casing upon said disks and said arbor
to mount said arbor upon said shaft coaxially
'concentrically with respect to the latter for ro
therewith for rotation by the same, a pair of
tation therewith, said disks having marginal
members supported by said arbor coaxially there
flanges for engagement with the inner faces of
with for rotation therewith, said members hav
the bead portions of a tire casing mounted upon
ing portions for engagement with the inner edges (il) said disks, and at least one of said disks being
of the bead portions, respectively, of a tire cas
mounted upon said arborY for movement there
ing to mount the casing upon said members and
along away from and toward the other disk to
said arbor concentrically with respect to the lat
spread apart and to release for contraction the
side walls of a tire casing mounted upon said
ter for rotation therewith, said members fur
disks.
ther having portions ñxed with respect thereto
MERVIN V. ARNOLD.
for engagement with the inner faces of the side
JAMES W. NAPIER.
walls of a tire casing mounted upon said mem
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