Nov.v 26, 1946. ì H. v. JAMES ' TIRE 2,411,687 RETREADING DEVICE Original Filed July 24, 1944 Ü . I BY 2 Sheets-Sheet l HARM@ MJA/w55. ' f Nov. 26, 1946.v I 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. l ATTORNEY.A Patented Nev. 26, 1946 _' 2,411,687 l UNITED Í STATE s PATENT;v ‘OFFICÉQ~ 2,411,687 .v " . . l.TIRE .RETREADING DEVICE( . Harold V. James, Denver,'ïColo. . ‘ y ` v v I f i A ~ *original application July 24, -19.44, serial No.' ' f -` 546,266. rDivided and this application July 9, A.1945, Serial No. 603,817 ~ comms. , ' ' . (01.18-18) ' l 2 5 'I'his application is a division of applicant’s co l ì ~ » 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 '_ ` ' ’ - - ' f 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 » 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. ‘ f 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. f l 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 15 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 . j f ~ f , f j ~ vWhen the’clamp bar is released, theztwo'secftions II may be swungA away from each other .y . 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 d ‘ ' ' , _ _. .lÍïFig. '3ds' asimilar .cross-,section takenvvonv the line `3-3,.Fig. 1. . _ , _ ' p Y, '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. y ' . . . , . Fig.-5 is'ja'fragmentary perspective view ofthe interior Vof the Vmold housing. y p ¿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. ' » ~ : ‘ ‘2,411,687 3 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. ' 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. , , . ‘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., ` „ ' -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. ' 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 n '[6 ¿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 ’ = 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` " f ~ ’V " _' QA; dowel pin 6l iSpO'sitioned in'one Vof the sec 20 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 -‘ ` ' 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 ' 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 7 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 25 of the free extremity of said jack screw. HAROLD V. JAMES.