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Патент USA US2411687

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Nov.v 26, 1946.
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H. v. JAMES
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TIRE
2,411,687
RETREADING DEVICE
Original Filed July 24, 1944
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HARM@ MJA/w55.
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Nov. 26, 1946.v
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H. V. JAMES
' 2,411,687
TIRE RETREADING DEVICE
original Filed July 24, ~1944 v
_ 2 Sheets-Sheet 2
INVENTOR.
HAROLD l/_ J/z/k/fs.
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ATTORNEY.A
Patented Nev. 26, 1946
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2,411,687
l UNITED Í STATE s
PATENT;v ‘OFFICÉQ~
2,411,687 .v " .
. l.TIRE .RETREADING DEVICE(
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Harold V. James, Denver,'ïColo.
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~ *original application July 24, -19.44, serial No.' '
f -` 546,266. rDivided and this application July 9,
A.1945, Serial No. 603,817
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(01.18-18) '
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5 'I'his application is a division of applicant’s co
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This invention relates to a tireyk retreading de
vice such as> illustrated andv described in prior
Patent No. 2,288,316,~'issued January 4, 1941, and
haswfor its principal `,object the provision of a
tration.
occupy a minimum of’floo'r vspace and which will
apply a uniform mechanical pressure to the tread 10
`o1? therv tire,VV _thus eliminating the necessity for all
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The improved retreading device is designed to
»support a tirevcasing in a vertical position and
to apply mechanical expanding `pressure to the
interior of the tire casing to force it outwardly>
highly efficient, verticall mechanism which >will
>airand steam bags,v
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In Fig. 4 only the top and bottom pairs‘of radial
pressure shoe arms have beenillustrated. `'I‘he
remainder have been omitted to clarify the illus
pending application, Serial No.V 546,266,1i1ed July
24,1944.
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OtherÍobjects of the invention are‘tovprovide `
means' vfor supporting` a'mechanical pressure de
vice for casing vulcanizers so that `it'may be
easily handled by` one man regardless of its
weight;- to providermechanic'al means for expand
illlg‘a tirecasing into a matrix mold in which a
against an external, heated mold face.
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The device comprises a circular, hollow hous
ing formed in three sections, a lbase section I0
an'dtwo hinged >sections II'.- The base section
I Ii is supportedon suitable supporting legsk I3,
which are braced by means of suitable leg braces
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The hinged sections, I I are mountedon the ex
tremities of the base section lll'uponsuitable
hinge pins I4 and may ybeY clamped together at
` 'their topsto complete the circular mold by means
,maximumV expanding action vmay be hadwith a l
‘minimum of effort; toprovide an expansible re
`silienirring which when-expanded into the casing
an upstanding ear 58,-‘on one of the sectionsI l,
by the mechanical pressured'evice will uniformly f
on ‘_a` suitable'hinge" pin. I 6. “Thebar I5 drops
distribute the pressure over >theentire¿internal
surface regardless ofv irregularities"therein.'i
Other objects and advantages residey inthe de
into a ` receiving notch in'a similar ear'59 on'the
tail Aconstruction of the invention_,gwhich isßde
Vsigned for simplicity, economy; `and efficiency.
These will becomermore- apparent fromV the fol
_lowing description'. l1
of a threaded clamp rbar'` I5 Awhich is hinged in
other section into" which it is clamped by means
of a'clamping nut 11.". By'tightening the lclamp.
'ing' nutv I'I, the two ’ sections . may “be 'rigidly
clamped together.v
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vWhen the’clamp bar is released, theztwo'secftions II may be swungA away from each other
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In thek followinggdetailed’ description of the
30 about the axisof the hingev pins I4,`as shown in
invention, reference is hadgto the> accompanying
broken -line in Fig; 1.1"I'heamount of- outward
drawings which form a part hereof. Like numer
alsrefer to like parts in all views vof the drawings
vmovement of these sections is limited by: means
>of stop bars I8 which'are secured atone of their
extremities to the section I0 andare provided
v35 »with slotted openings I9 for receiving pins 20
Y . Figil is a side view cf'the improved tire re
fixed to the' hinged sections II. When the pins
'.'tr'eadìn'g device, illustrating the latter in the
20 reach the extremities of the openings I9, out
closed. position,.ready for use., In this view the
ward movement of the sections` II isstopped.
Each of-.the sections I I is providedwith a .cush
open position of thé 'mold is indicated in broken
40 ionin'g bracket 2| from- each of which a pull bolt
imac isa' cross-section'rthicugn„the moidhous »22 is suspended. VThepull bolts pass through,
>fixed .brackets 23on’the section I0. The,- pull
'Line taken pn the, nne 24,2, Fig. 1. ~ "
and throughoutthe' description. .
Inthe drawings
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_. .lÍïFig. '3ds' asimilar .cross-,section takenvvonv the
line `3-3,.Fig.
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'bolts '22 are constantly'pulled downwardly by
means of helical compression'v springs 24.1 `The
» Fig. 4,»is a vertical cross-section through the 45 springs act to cushion 'the' closing action of the
y improved retreading _device taken on the line
4?4,Fig.1.
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Fig.-5 is'ja'fragmentary perspective view ofthe
interior Vof the Vmold housing.
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¿Fig 6_ is a detail perspective view illustrating
the method. of; mounting a mechanical pressure
shoe’onits actuating arms, as'used in this device.
"Fig. 7' isa detail sectionallvíew through the
ñxed bracket bearing for the jack screw> employed
arbe, innove@message _device-- 1
two hinged housing sections I I and to prevent
them `from falling together with damaging- force.
A -resilient cushion member~v 25 surrounds veach
-pul1bolt5 Thus it can be seen that as the sections
II .move inwardly, a portion of their weight will
be absorbed by the bolts 22 to allow them to come
gently together. -`When the sections move` out
wardly,- they cometo rest on the cushion mem
bers 25.' The springs 24 also assist the operator
lin opening the section‘I I. '
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‘2,411,687
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A pry boss 2'6 projects from each of the sec
tions l l adjacent to the top thereof to allow a pry
bar to be inserted therebetween to pry the two
sections apart after the retreading operation has
been completed.
Each section of the housing is provided with an
arcuate heating bar 28 which is resiliently mount
ed between guide lugs 29 on‘its inner surface.
The heating bars Z8 are formed ci a metal hav
ing a high thermal'conductivity, such as alumi
num, and each carries an imbedded electrical
element 3Q, such as a “Calrod,” from which it
derives its heat. The Calrod is inset'in a groove
in the inner face of the heating bar so as to be
exposed to the inner surfacethereof. >The rods »
at its outer extremity by a hinged bracket 31.
A bracket frame 43 is secured to the side of the
lower housing section l0. The bracket 31 is
hingedly mounted on this frame on suitable hinge
bolts 44. At the bracket 31 the jack screw is
journalled in a bearing sleeve 38 and terminates
vin a hand wheel 39. The sleeve 38 is vmounted
adjacent its inner extremity on a. pivot pin 4D in
the bracket 31. An ear 4l is formed on the sleeve
-38 adjacent its outer extremity for receiving the
upper extremity of a connecting rod 42. The
lower extremity of the connecting rod 42 is hing
.edly mounted on a hinge pin 64 on the bracket
frame 43 at a point outwardly from and above
the'axis of the-hinge bolts 44.
The above construction operates as follows: As
are locked in the grooves by indenting the edges
of the latter as shown at 68.
the hand wheel 39 is pulled outwardly, the bracket
31 will swing outwardly. This normally would
swing the inner extremity of the jack screw 35
upwardlywhich would not be possible since it
would strike the tire casing in the mold. This is
prevented, therefore, by the action of the con
necting rod 42 which tends to cause the inner
extremity of the jack screw to follow a sub
stantially level path until it‘leaves the 'mold and
The current to
the heating elements Vis conveyed across Vthe
hinge points of the adjacent sections through
suitable ñexible conduits 3 I.
VThe actual molding of the tire tread is accom
plished by means of a ‘sectional matrix ring 32.
The ring 32 is formed in three sections fitting the
sections I!! and ll of the housing. _The‘back of
each- matrix ring section rests on the lugs 29 in
the housing sections and is locked in place there
in by means of set screws 33 accessible from the
exterior .of the housing. The inner face of each
matrix ring section provides the mold for the de
then swings it outwardly to the broken line pc
sition of Fig. 4 Where it will befout of the way 'for
removingand replacing the tire casings.
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Outward movementof the bracket 31 is limited
means of projecting Vfeeti45 `formed on the
sired ~tire tread design. The ring: sections >>are 30 Yby
hinged
bracket -31. 'I'hese'feet contactjabutments
quickly and easily removable by simply loosening
46` on the frame 43 when the brackët'31 >reaches
the set screws 33 _so that mold sections of any de
its extreme outward position, to support the me
sired'isize `or >design can be quickly and easily
placed in the device.
l, The heating bars 28 are resiliently mounted
chanical pressure 'mechanism ' in -the. out-of-use
.., position.
*When the hinged bracket 31 is swung upwardly,
between the guide lugs 25 upon suitable springs
the connecting 4rod also actsv onth'e sleeve 38 to
>Til vandl are each held in place against the action
accuratelyV alignV the jack screw 35'w`ith its bear
of the Ysprings by means of ra pair of .retaining
ing position in the inner bracket 36. The jack
v.b'olts `1l i'extending through the sections l0 and
Il. `The bolts. 1l of `each ~pair are ~arrangedin 40 screw terminates in a spool '21 which slips into
the'bracket 3'6 and i'sÍlockéd therein by means
parallel relation'so as to allow, free radial move
of a set screw _41. Thespcól is 'rdtatably mounted
mentf‘oi the bars-“28 Without binding. The bolts
on the jack screw so that' the set screw 'prevents
"Il are so’adjusted as to allowthe bars to normally
axial withdrawal of the .jack screw butallows ‘free
project inwardly `beyond the `tops ofgthe lugs 29,
rotation thereof.
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‘as 'shown in Fig. 5. ‘Thus when the matrix rings
The jack screw`35 nsupports-a mechanical ex
are resting on the tops of the lugs‘ 29 the heating
pandi'ng Vdevice which is described 'more in detail
-bars willf‘be fòrcedlinto contact'therewit-h >under
in applic'ant’s prior Patent No.,§2,‘_228,3`1`6. Briefly,
'the'iniiuence'of the springs 13. The .Contacting
this device comprises two nuts "48jthreaded onto
arcuate .surfaces of the heating bars 2-8 and the
matrixirings'f32 are accuratelymachined to hold 50 opposite‘extrer'riities oî'the jack screw 35. The
tl'ireads'.l on the -latter are of opposite hand at the
them'in "uniform contact over their-entire vareas
opposite vextremities so that "rotation of the jack
fs'o "that a uniform transference of heat- is ob
screw'in one direction will 'separate the nuts Vv'43
ïtalne'd, to the 'matrix rings 32 throughout the en
and rotation in the> other directionl will 'cause
tire circumference of the mold. ¿All l.contraction
them to approacheach other.,
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-and expansion under the influenceof heat israc Cl Ul 'iA circular series of pressure shoes' 52 surround
Vc'ommc'id'ated bythe springs 'lll without effecting
the jack screw between the nuts “48. ."Each sho'e
the contactbe'tween the bars` >28 and the -matrix
is hingedly secured to a fitting '5l `by means 'of Va
rings. vThelho'using sections I0 and H, are en
hinge pin 63. The extremities 'of Ya pair of radial
tirely open,'through Ventilating openings 55, and
toggle arms 49 are hinge-dîin the ñtting lon jhmge
they’do not `contact lthe matrix rings so thatv free
pins 52. A toothedclip".63jis'jsecured to veach
circulation of air is vallo-wed»throughout the en
tire housing-so that uniform heating of the matrix
results without‘un'due heating oi the housing.
, ¿Since the only contact’between the matrix rings
`32‘fand the housing is at the `tops ofthe lugs 29,
it is'` not v'necessary to machine the entire inner
'circumference of the housing. *Only Vthe tops of
>the 'lugs n'eedto be machined. This reduces vman
ufacturing cost'and reduces heat loss to the hous- l
111g.
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The'entire tire casing is >uniformly forced out
wardly Yagainst 'the matrix rings by means of a
fm'e'chanical pressure device. `The llatter consists
of a jack screw 35 which is >detaclriably supported ` ‘
arm 49.
The`clips fare"` provided"’with> inter
ineshing gear teeth 50.v ÄThe'opposite"extremity
`of onevtoggle arm of each pair 'is yconne'c'zted >to
one' of the nuts`48 andthe other ‘arm is >simi
larly'conn'ected 'to the‘other nut'48. Thus'when
the nuts -approach each other, the ñttings'5l are
forced outwardly, >th'us 4expanding `the entire vse
ries of shoes. When the nuts 'are "separated
from- each other, Ithe shoes are drawninwardly
toward the jack 'screw’in overlapping relation.
vThev -shoes are curved to appróximatethe arc
y»of their expanded circumference and each shoe is
provided onits outer-surface with -a centralridge
at its inner extremity in a ñxed bracket 3S and 75 53 which extends into a medial grooveV formed
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¿in the, _inner’vfacëïï of 3a' -resilient,V vperiygífieralv cush
uposition' at-»th'e -other side of said mold; a ja'ck
screwirotatab'ly mounted in said hinged bracket
“entcompressible and extensible material, such as '
’dandfarrangedto be detachably received by said
jion band __54.’ 'The band 54 is formed'from resili
fixed bracket; and an annular expanding mech
5 anism mounted on and surrounding said jack
screw, said mechanism being operable by said
" if _fI‘hus it can be seen >that when Ythe hand wheel
vjack» screw so that it may be swung into or away
„ "33 is rotated-in'one direction, the band 54 will be
Vfrom said mold by swinging said hinged bracket.
f expanded 'radially outward to force the tirec'as
vv2. In a tire retreading device of the type hav
‘ing intoy the matrix ringsv 32;"andwhen rotated a
lin ~the other' direction, will be contracted away 10 ing- an annular, vertically positioned matrix mold
'ïfor aatire tread, means for expanding said tread
itherefrom. The contraction can be extended'un
into said mold comprising: a iixedfbracket ex
Atil' thefshoes 52 lie close to the jack screw 35, 'as
_Árubbergand forms the contact member forth'e
“interior o'f the tire casing being retreaded. 'l ’
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gsñhown ^inthe broken line in Fig. .4, at‘which
‘time the band 54 can be entirely removed Afrom
tending to an axial position at one side of said
¿ mold; a hinged bracket extending to a similar
15 ‘position at the other side of a said mold; a jack
‘screw rotatably mounted in said hinged bracket
fgItwwilljbe-noted that’one Vextremity of veach
vand arranged to be detachably received by said
1 o_f'thevr shoes v52 vis -inset vas. shown atV 69 tof'allow
fixed bracket; an annular expanding mechanism
rmounted on and surroundingv said jack screw,~
-themfto form a> perfect circular alignment in
îtheirY workingy diameter.rr`
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_' QA; dowel pin 6l iSpO'sitioned in'one Vof the sec
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v‘tions >Il so as to enter a dowel hole in the other
sectionto accurately align the two sections when
they are clampedïtogether in the closed position.
The extremities of the clamp screws 33 are pointed
saidmechanism being operable by said jack screw
so that it may be swung into or away from‘said
mold by swinging said hinged bracket; a spool,
rotatably mounted on the extremity of said jack
screw, adapted to :bereceived in said fixed brack
matrix rings to accurately locate and lock them
et; and-locking means engaging said spool to pre-Y
vent its> withdrawal from said ñxed bracket un
in position.
til desired.
so as to enter countersunk depressions in the -‘
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When the device is used for tire casings of
smaller diameter, the matrix rings, of course, are
of a smaller internal diameter than those illus
trated, the diiîerence in size being taken up by
increasing the thickness of a contact pad 34
which. may be formed on the back of the `ring
sections. To save metals-and weight this pad
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3. In a tire treading device of the type having
an annular, vertically positioned matrix mold for
30 a tire tread and a mechanical expanding de
vice positioned within said mold, means for sup
porting said expanding device so that it can be
swung from said mold comprising; a jack screw
normally extending axially through said mold
may be formed hollow as illustrated, if desired. 35 and> supporting said expanding device; a first
bracket fixed to and extending to an axial posi
It is desired to call attention to the bearing
tion at one side of said mold; a bearing in said
construction in the fixed bracket 36 as illustrated
bracket for removably receiving one extremity
in detail in Fig. '1. The stem of the set screw
of said jack screw; a second bracket; means for
41 is hollow at the point to receive a detent
spring 65. The spring acts against >a pointed 40 hingedly mounting said second bracket so that
it may be swung to an axial position at the
detent head 66 which forms the extremity of the
other'side of said mold; and a second bearing in
screw shank. A plunger 61 extends from the
said second bracket permanently and rotatably
head 66 axially outward to project from the
supporting said jack screw so that when said sec
screw 41. The point of the detent head enters
a peripheral receiving groove vin the spool 21 45 ond bracket is swung from its axial position said
jack screw and said expanding device will be
on the extremity of the jack shaft, and when
swung from said mold.
the screw 41 is tightened against the head 66
4. In a tire treading device of the type having
the latter is locked in place in the groove. If
an annular, vertically positioned matrix mold for
the screw 41 is loosened however the head is
a tire tread and a mechanical expanding device
retained in the groove only by the action of the
positioned within said mold, means for support
spring 65, which acts to temporarily hold the
ing said expandingA device so that itcan be swung
jack shaft in place. This construction enables a
from said mold comprising: a jack screw nor
>single operator at the front of the device to
mally extending axially through said mold and
withdraw and reinsert the extremity of the jack
screw without danger of its falling from place 55 supporting said expanding device; a iirst bracket
vfixed to and extendingl to an> axial position at
until the screw 41 is tightened.
one side of said mold; a bearing in said bracket
The hinged sections l I and the base section l0
for removably receiving one extremity of said
are reinforced by means of suitable reinforcing
jack screw; a second bracket; means for hing
` ribs 56 and 51 to prevent distortion from the ex
treme pressures and temperatures placed thereon. 50 edly mounting said second. bracket so that it
y may be swung to an axial position at the other
While a speciiic form of the improvement has
side of said mold; a second bearing in said sec
been described and illustrated herein, it is de
ond bracket permanently and rotatably sup-r
sired to be understood that the same may be
varied, within the scope of the appended claims, A porting said jack screw so that when said sec
without departing from the spirit of the inven 06 ond bracket is swung from its axial position said
tion.
Having thus described the invention, what is
claimed and desired secured by Letters Patent
1. In a tire retreading device of the type hav
jack screw and said expanding device will be
swung from said mold, said second bearing be
ing hingedly mounted'on said second‘bracket;
and means for retarding the swinging movement
70 of said bearing as said second bracket is swung
from its axial position to initially retard the up
swing of the free extremity of said jack screw.
for a tire tread, means for expanding said tread
5. In a tire treading device Kof the type having
into said mold comprising: a fixed bracket ex
an annular, vertically positioned matrix mold for
tending to an axial position at one side of said
mold; a hinged bracket extending to a similar 76 a tire tread and a mechanical expanding de
ing an annular, vertically positionedmatrix mold
2,411,687
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vice positioned vwithin said mold, means for -sup
porting said expanding device so that it can be
Ina tire treading `device ofthe type having
>an annular, vertically positioned matrix mold for
'swung from said mold comprising: a jack screw
a _tire tread and a mechanical expanding device
positioned within said mold, means for support
`normally extending axially through said mold
and supporting said expanding device; a first
bracket fixed to and extending to an axial posi
.tion at one side of said mold; a bearing in said
bracket for removably receiving one extremity of
ing said expanding device so that it can be swung
from said mold comprising: .a jack screw normal
ly extending axiallyvthrough said mold and sup
porting said expanding device; a ñrst bracket
ñxed to and extending to anaxial position at one
said jack screw; a second bracket; .means for
hingedly mounting said second bracket so that it 10 `side of said mold; a bearing in said bracket for
removably receiving one extremity of said jack
may be swung to an axial position at the other
side of said mold; a second bearing in said sec
screw; a second bracket; .means for hingedly
ond bracket permanently and rotatably support
mounting said second bracket so that it may be
swung to an axial position at the other side of
ing said jack screw so that when said second
bracket is swung from its axial position said 15 said mold; a second bearing in said second brack
et permanently and „rotatably -supporting said
jack >screw and said expanding device will be
jacket screw so that when said second bracket
swung from said mold, said second bearing be
ing hingedly mounted Yon said second bracket;..a
connecting rod extending from said second bear
ing eccentrically of the hinge point of the lat
is swung fromits axial position said jack screw
and said expanding device will be swung from
said mold; and releasable latching means for
holding the yextremity of said .jack >screw’in said
ter; and means for pivotally mounting the ex
first bearing.
.;tremity of said connecting rod on an axis ad
jacent to but eccentric of the hinge point of said
second bracket so to initially retard> the upswing
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of the free extremity of said jack screw.
HAROLD V. JAMES.
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