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Патент USA US2119467

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May 31, 1938.
2,1 19,467
Filed Feb. 1'7, 1938
I 1
I I '
Perry QGhamberJ
Patented‘ May 31, 1938
. _
Perry '0. Chambers, Chicago, Ill., assignor to
Safety Vulcanizer Company, Inc., Chicago,
111., a corporation of Illinois
Application February 17, 1938, Serial No. 190,978
6 Claims. (Cl. 18—18)
‘ This invention relates to tire re-capping equip
Heretofore, tire re-capping equipment has
comprised a heated tread matrix designed to
'5 cooperate only with the tread portion of the
Of the accompanying drawing,
been associated with said tread matrix and
spaced inwardly substantial distances therefrom.
Cold ‘side-wall supporting rings have
in This has exposed substantial surfaces of the tire
sides between the side rings and the re-capping
matrix to radiate heat therefrom for the purpose
of con?ning the vulcanizing heat to the tread
Re-capped‘tires have not heretofore been en
tirely satisfactory because of off-center and
crooked treads.
They are nearly all off-center
from 11;" to 1/2" in the direction of the bottom
half of the re-capping vulcanizer. Many treads
20 are also wavy or snaky circumferentially about
Figure 2 is a radial section through the tread
portion of a re-capped tire showing an off-cen
ter tread such as has been heretofore produced.
Figure 3 is a part radial section through a
vulcanizer showing a modi?ed’ formvof the in
be heated in any suitable manner and removably
receiving and retaining therein annular re-cap 20
the circumferential areas on the sides of the tire
said matrix sections.
By con?ning the heat to the tread the rub
ber does? not soften and ?ow in adjacent areas
of the tire suf?ciently to permit su?icient re
alignment of the cords in the carcass whereby
;35 the tire will be effectively vulcanized in a mold
different than the original without setting up con~
?icting stresses in the tire which may result in
premature failure.
The general purpose of the present invention
min is to provide outwardly converging side-wall rings
for use in a re-capping vulcanizer which ex
tend closely‘ adjacent the re-cappingmatrix and
engage the side-walls adjacent the tread to force
the tire to enter the matrix and to retain the
.45 same properly centered therein during vulcan
'iz'ation, whereby the re-capped treads will be
in perfect alignment, the rubber in the side-walls
will be prevented from swelling and weakening
the carcass and the heat from the tread will
.50 penetrate farther down the tire in gradually de
creasing amount permitting a natural realign
ment of the cords in the tire and avoiding local
ized con?icting stresses.
The foregoing and other objects of the inven
55 tion are attained in the re-capping vulcanizer
numerals l0 and H indicate respectively upper
and lower annular vulcanizer sections arranged to
ping matrix sections l2 and I3 respectively, with
Referring to the accompanying drawing, the
the tire.
Blowouts and separation occur'frequently in
which were exposed during the vulcanization.
.25 This is- believed to be due to lack of restrain
ing pressure on the outside of the tire permitting
the rubber adjacent the tread to swell and be
come slightly porous during'the heating process
and thus weakening the fabric structure at these
‘the invention is not limited to'the speci?c form
thereof shown and described.
Figure 1 is’ a radial section through a known
type of re-capping vulcanizer with the improve
ment of the present invention incorporated
tire for vulcanizing new rubber onto said tread
illustrated in the accompanying drawing and
described below. It is to be understood ‘that
or without a spacer ring l4 arranged between
The matrix ‘comprising parts I2, l3 and I4
is designed to embrace only the tread portion 2,5
of a tire from shoulder to shoulder as shown to
vulcanize new rubber l5 onto the old rubber l6
of a tire [7. During a vuleanizing operation tire
I1 is mounted on a rim i8 with a pressure bag,
or tube I9 therein which is expanded by internal 30'
fluid pressure after the tire i1 is placed into the ,
vulcanizer as shown to force the new tread rub- ’
ber l5 into the recesses in the matrix.
The vulcanizer of the type shown has usually
utilized side wall rings 20, 20 but nevertheless 35
such vulcanizers have produced off-center treads
such as shown in Figure 2 and tires with the
other defects noted in the opening paragraphs
of this speci?cation.
To obviate these deflects, rings 2|, 2| are pro- 40
vided which extend closely adjacent the tread
matrix but out of contact therewith whereby
effective re-capping vulcanization is secured of
the new rubber i5 to ‘the old rubber I6 with
the new tread perfectly centered, but with suf?- 45
cient pressure being maintained on the‘ side- '
walls of the tire adjacent the tread to avoid
swelling of the rubber and weakening of the
carcass and also with suflicient penetration of
heat to the carcass, tapering away from them
tread, of course, to permit such realignment of
cords in the carcass as to avoid localized con
?icting stresses. The spacing of the centering
rings 2| from the tread matrix provides gaps
G. G. which result in the centering rings being
will soften the rubber adjacent the tread, to ,re-V,
matrix but the gaps G. G. are of insuf?cient
width to permit bulging of the carcass of the
tire between the centering rings and the matrix.
’ It willrbe understood that rings 2| may be
lieve'localized stresses adjacent the tread.
integral‘with rings '20, but, if not; may’ have
portions 2 IB embracing rings 20 and portions 2lb
" for supporting the same on radial webs 22 in
» side of, the skirt portions “la and IIa or the Vul
of substantially less temperature than'the tread
canizer ‘sections.
A- , modi?ed V treadecen'tering ‘
1 ring is shown at 25' in Figure 3 which'has a pore
3. A vulcanizer forre-capping tires, comprising
cooperating vulcanizer sections, means for sup
porting and in?ating a’. tire therein, a tread‘
matrix supported in said, sections for‘embracing
the tread rubber only of‘ a tire therein, means
for applying heat to said tread matrix, ‘side-wall
supporting plates associated with said ,vulcanizer,
a substantial ‘distance inwardly of the, tread 10'
matrix "and outwardly converging plates between
"tion 25a 'similarjtoportion ZIP of ring 2| "and'a the side-wall supporting plates and. the matrix, 7 1
portion 25‘? embracing the tread, matrix, but‘ fox-engaging‘ the side-walls of theitire" adjacent 1
'not' contacting
thesameduring vulcanization,
the tread between the side-wall plates and the
15 J being held in spaced relation by the internal
tread matrix for centering, a tire ‘tread'insald
pressure in the tire.
The use of the above-described vulcanizer will
be understood by'skilled artisans; Therings 2!‘
or 25 will be retained in the vulcanizersections
assembled with the tread matrix and the :rings'
20 and'williserve to hold, the tread of the tire
properly centeredin the matrix to' con?ne the
"fside-ywalls against-swellingfand prevent porosity '
therein and to cause effective cord realignment,
‘Modi?cations Qfithe inventionotherthan those
matrix and supporting it againsto?-centérmovea
merit until'a new tread is vulcanized on the tire,
;,there being gaps, between thecentering plates '
and the matrix of such width as to prevent bulg
ing'of ‘the tire therebetween, but resulting in ,
application of a ‘lower, . temperature‘ vto ntheltire
inwardly of the gaps than that applied to the‘
tread matrix.
'4. A tire re-capping'. vulcanizer includingrgeo-er 25 '
operating annular vulcanizer sections, means for
7 disclosed h'erei'n'may ber'resorted to‘ without de- - supporting and in?ating a tirethereima tread '
‘ parting-from‘ the: spirit thereof or the scope of V lmatrix carried thereby'for engaging the tread ,
rubber only ‘of a tire'pto bejre-capped," means ;,to;.
apply heat to saidrtread matrix, andloutwa'rdly'
1"; :A'vulcanizer Ior re-capping tires, comprising Q converging’ side-wall engaging i'plates' supported’ 30
cooperating 1vulcanizer sections, means’ for sup
in said vulcanizer out of contact with but closely,
thea'ppended claims.
swim ‘is claimed is:
portingyand in?ating 5a tire therein,‘ a tread
matrix supported in said sections for embracing
the tread rubber only of a tire therein,'meansj
.for heating said tread matrix, side-wall support
adjacentsaid matrix 1for centering, and holding '7
centered, .a tire; to be re-capped in said vulcanizer
. Without permitting the tire to bulge betweenlthe
: 35
centering plates and the‘ matrix. '
'5. A tire re-cappingc vulcanizer- including’ co
operating annular vulcanizer sections, vmeans 'for
andloutwa'rdlyr converging plates for engaging the supporting and in?atinga tire therein, a tread
side-walls of the tire adjacent the tread and bee matrix carriedtherebyior engaging the tread
tweenthe side-wall plates and the tread matrix rubber only of la, tireto-be re-capped, means to i
ling plates associated with said vulcanizer a sub- -
stantial, distance inwardly of the tread matrix,
7' '
for centering a'tire tread in said matrix and sup
apply heat to said tread matrix, and outwardly '
porting it against, cit-center movement ,untila
converging side-walLen'gaging plates supported
new tread is'v vulcanized on the ‘tire, there being
in said vulcanizerout of contact withbut closely
gaps of ‘such width-between 'thejtread matrix, ' adjacent. said matrix for centering, and‘holding
and the centering plates as'to result in 'therlatter centered, a tire to be-rev-cappedin said vulcanizenig
' being ofless temperaturébut preventing bulging there being gaps betweenthe' tread fmatrixi and
of the tire therebetween.
; '
"the converging side-wall engaging plates of such
2. 'Ajvulcanizerrior rte-‘capping tires, comprising‘ iwidthas toprevent bulging of a tire therebetweén
‘cooperating'vulcanizer' sections, means for sup- 7 ‘but resulting, inv application 'of a lower tempera
porting and in?ating a tire therein, a tread' ture to.the tire inwardly of 'the gaps than that 1-‘
matrixsupported insaidc sections forembracing
applied to the'tire by, the tread matrix,‘
the tread rubber only of; apti're therein, means
for heating said tread matrix, side-wall support
re-capping vulcanizer of a tread matrix for emé -
6. .Thecombination'in'a horizontal annular tire,
7 ing plates associated with said vulcanizer 'a sub,
bracing the tread rubber only of a tire therein,
stantial distance inwardly of the tread matrix
and outwardly converging plates for engaging the
"side-walls of the tire adjacent the tread and be
‘' tween the side-wall plates and theitread matrix
' means for applying'heat to said tread matrix, '
for’ centering‘a tire 'tread'in said matrix and sup
_ ,7
means for'supporting and in?ating atire therein,
and side-wall engaging‘ plates adjacent said tread
matrix converging outwardly substantially to-the
contour ,of- theouter portions of, the side-walls.
60 porting it against ,o?-centenmovement until a of saidtire for centering ,a' tirezre'specting said _
'fnew tread is vulcanizedfonthe ‘tire, said vul 1 : matrix and against which side-wall engaging
‘canizer. sections having inwardly extending skirts, ''plates the tireis in?ated during vulcanizatlonjf '
'means for retaining said side-wall plates in said
iskirtsfand means for retaining said centering
‘7565 jplatesjbetween the side-wall plates and the tread
matrix, there being gaps 7 between the centering
:plates and the tread matrix of, suchwidth as to
there being gapsibetwee'n said, sideéwall engaging 7
plates and said tread'matrix of such width as" to
prevent bulging of a tire therebetween, and'causé
ing said centering plates to beef, substantially
less temperature than the tread matrix, but§yet
su?iciently hot to cause some softenlngrof' the
‘ . prevent bulging of the tire therebetween but su?ié '
"rubberof the tire adjacent the tread to permit“ '
cient to result in’ a lesser heatibeingrapplied to V readjustment in the carcass or the tire to, the 7.", '
it - ‘the tire: at the centering, plates than applied'to
" the new tread rubber, such heat being applied as
newly applied tread,
PERRY oormMnEas.
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