CA1084220A - Retreading mold - Google Patents
Retreading moldInfo
- Publication number
- CA1084220A CA1084220A CA259,188A CA259188A CA1084220A CA 1084220 A CA1084220 A CA 1084220A CA 259188 A CA259188 A CA 259188A CA 1084220 A CA1084220 A CA 1084220A
- Authority
- CA
- Canada
- Prior art keywords
- bead aligner
- bead
- bladder
- wheels
- aligner wheels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A retreading mold including a pair of relatively movable platens each carrying a matrix and a bead aligner wheel with the bead aligner wheels being in opposed relationship to each other, an annular bladder having first and second innermost peripheral marginal portions in overlying relationship upon first and second of the bead aligner wheels, first means for creating a hermetically sealed annular gap between a terminal edge of said first innermost peripheral marginal portion an outboard portion of said first innermost peripheral marginal portion and said first bead aligner wheel, and second means for creating a hermetically sealed annular gap between a terminal edge of said second innermost peripheral marginal portion, an outboard portion of said second innermost peripheral marginal portion and said second bead aligner wheel.
A retreading mold including a pair of relatively movable platens each carrying a matrix and a bead aligner wheel with the bead aligner wheels being in opposed relationship to each other, an annular bladder having first and second innermost peripheral marginal portions in overlying relationship upon first and second of the bead aligner wheels, first means for creating a hermetically sealed annular gap between a terminal edge of said first innermost peripheral marginal portion an outboard portion of said first innermost peripheral marginal portion and said first bead aligner wheel, and second means for creating a hermetically sealed annular gap between a terminal edge of said second innermost peripheral marginal portion, an outboard portion of said second innermost peripheral marginal portion and said second bead aligner wheel.
Description
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This invention relates to novel retread molds adapted for manual, semi-automatic, or full automatic opera-tion preferably in bag or bladder retreading operations, and a primary object is the provision of a mold which is efficient in operation yet constructed with simplicity to enable opera-tion thereof by relatively untrained personnel with safety while providing long term machine life and obtaining retread tires of excellent quality.
A construction in accordance with the present invention comprises a retreading mold comprising a pair of relatively movable platens, each platen carrying a matrix ~- means. First and second bead aligner wheels are carried by a ~ 1 respective first and second of the platens. The bead aligner ;
wheels are in opposed relationship to each other. An annular bladder is disposed between the platens with the bladder .. :~ . -having first and second innermost peripheral marginal portions.
~; The first and second innermost peripheral marginal portions are in overlying relationship upon the first and second bead aligner wheels. First means are provided for creating a her~
metically sealed annular gap between the terminal edge of the first innermost peripheral marginal portion, an outboard por-tion of said first innermost peripheral marginal portion and said first bead aligner wheel. Second means are provided for ~ ~
creating a hermetically sealed annular gap between a terminal ~;
edge of the second innermost peripheral marginal portion, an outboard portion of said second innermost peripheral marginal portion and said second bead aligner wheel. -~;
The invention will now be described with reference to the accompanying drawings which show a preferred form thereof and wherein~
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. . .. . . . . .. . .: .... : . . .. .. . -: . :
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Figure 1 is a perspective ~ront view of a novel automatic retreading machine constructed in accordance with this invention, and illustrates a pair of platens in the open position thereof carrying segmented matrices with a tire located upon a lower bead aligner wheel.
Figure 2 is a front elevational view of the machine of Figure 1 partially in cross section, and illustrates the matrices closed and a bladder under pressure maintaining a tire to be retreaded in conformity with the interior of the matrices.
Figure 3 is a cross sectional view taken generally along line 3-3 of Figure 2. and particularly illustrates means for imparting motion to the bead aligner wheels and the drive for relatively moving the platens carrying the matrices relative to each other.
Figure 4 is a fragmentary enlarged sectional view of a tire positioned within the closed matrices.
Figure 5 is a fragmentary enlarged sectional view of a tire positioned within the opened matrices, and particularly illustrates ~3~manner in which a partial vacuum retains the 20 tire beads against the bead aligner wheels. ~ -Figure 6 is a fragmentary top plan view of the bladder associated with the machine of Figures 1 through 3, and illustrates raised ribs upon an exterior surface defining there-between vent means or passages terminating short of enlarged beads at inner ed~ges of the bladder. ;
Figure 7 is a sectional view taken generally along line 7-7 of Figure 6, and more fully illustrates the raised beads above the exterior surface of the bladder and notches in opposing ~
surfaces of the beads defining means for permitting the intro- , duction of fluid into and the removal of fluid from the~ ladder interior.
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Figure 8 is a fragmentary enlarged cro~s se~tional view taken along line 8-8 of Figure 6, and more fully illustrates the manner in which the notches of the bladder beads are in axial alignment.
Figure 9 is a view looking axially at one of the pair of bead aligner wheels of this invention, and illu~trates a circular continuous uninterrupted sealing rib and a plurality of venting grooves adapted to be placed in fluid communication with atmosphere through bores in a flange of the bead aligner wheels.
Figure 10 is an axial sectional view taken through a pair of the bead aligner wheels o the invention, and illustrates the manner in which fluid is introduced into the bladder as well as the manner in which air is vented to atmosphere from between the exterior surface of the bladder and an interior surface of a tire undergoing a recapping operation.
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Fi~ure 11 is a fragmentary elevational view partially in section of a modification of the machine of Figures 1-~, and illustrates the manner in which the diameter of a tire is fore~
shortened by being mechanically clamped to the bead aligner wheels in lieu pf vacuum clamping to be described hereinafter~wiith respect to the machine of Figures 1-3.
Figure 12 is a sectional view identical to Figure 11 but illustrating the matrices in their closed position.
Reference is first specifically made to a machine 10 of Figures 1 through 3 which includes a conventional base 11 which has secured thereto in a conventional manner a pair of upstanding cylindrical supports 12,13. An upper platen 14 is , fixedly secured to an upper end portion (unnumbered) of the supports 12,13 by nuts (unnumbered) in the manner readily apparent from the upper right hand portion of Figure 2. The upper end portions (unnumbered) of the supports 12,13 are, of course, threaded to receive ~he nuts and the latter may be ~ -~
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adjusted or threaded to achieve aliynment between the upper fixed platen 14 and a lower movable platen 15.
The movable platen 15 is provided with conventional bushings (unnumbered) which surround the support~ 12,13 and thus the platen 15 may be readily moved between the open position (Figure 1) thereof and the closed position illustrated in Figure 2.
Means for imparting relative movement between the platens 14,15 is generally designed by the reference numeral 20 and includes an electric motor 21 connected to a suitable elec-trical source (not shown) which drives a sprocket 22 keyed to an output shaft 23 of a gear reducer 24. A drive chain 25 is ~ ~
entrained about the sprocket 22 and about a sprocket 26 (Figure 2) .:
suitably secured to a tubular stub shaft 27 which in turn is welded or otherwise secured to an internally threaded nut 28. A ~ :
reciprocal member 30 in t~e..~form of a screw is threaded within `. the nut 28 in the manner readily apparentf~:.o.m~Figures 2 and 3. `.
A lower end portion 31 of the screw 30 is capable of descending : ~.
into a suitable lubricant, such as Gil 0, maintained within a generally cylindrical reservoir or sump 32. Accordingly, upon .
the ascent of the screw 30, the oil deposited upon the end ~:
portion 31 will maintain the threads (unnumbered) of the nut 28 continuously lubricated during the reciprocal motlon imparted : to the platen 15.
An upper end portion 33 of the screw 30 is provided ; with means, generally designated by the reference numeral 35, ~ .
- for achieving self-centering between the platen 15 and the .
platen 14. The means 35 is simply a convex surface on the end `; ~.
portion 33 of the screw 30 which bears against a planar (unnumbered) surface of the platen 15. Thus, if there is any mis~
alignment of~a minor nature between the platens 14,15 and the .
matrices associated therewith to be described more fully herein- ~ :~
after,the-~platen 15 will tilt or cock as need be to an extent ' ~ ':
~4220 permitted by -the bushings (unnumbexed) associated with the supports 12,13 thus assuring alignment between the matrices and the tire therein. Furthermore, the platen 15 though of a relatively rigid construction can still flex somewhat under the force applied thereto by the screw 30 and this in turn achieves a self-adjusting or self-centering between the platens 14,15 and the matrices carried thereby.
An upper bead aligner wheel 40 and a lower bead aligner wheel 41 (Figures 2, 3 and 10) are reciprocally carried by the respective platens 14,15 and are mounted thereon for relative reciprocal movement toward and away from each other in a conventional manner. More specifically, a pair of fluid motors 42,43 carried by the upper platen 14 include identical ; pistons 44 (only one of which is illustrated in Figure 3) which are secured to the upper bead aligner wheel 40 for imparting motion thereto in a conventional manner. Likewise, fluid motors 45,46 carried by the lower platen 15 include piston rods 47 (only one of which is illustrated) for reciprocating the bead aligner wheel 41 in the manner readily apparent from Figure 3.
During the reciprocal motion imparted to the bead aligner wheels 40,41 guidance is provided by guide rods 50,51 secured to the bead aligner wheel 40 and by guide rods 52,53 (Figure 2) secured to the bead aligner wheel 41. The rods 50,51 and 52,53 are slidably received in tubular guides 54,55, res-pectively, (only one of each being shown in Figure 2) carried by the respective platens 14,15. -Conventional segmented matrices 56,57 are carried -~
by the platens 14,15 and are operative in a conventional manner.
~hough specifically utilizing segmented matrices 56,57, the machine 10 may be modified in the manner to be described hereinafter in order that the same can utilize "full" or non-segmented circular matrices.
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Reference i~ now made specifically to Figure 10 which illustrates the bead aligner wheel~ 40,41 in more specific detail. Since the bead aligner wheels 40,41 are essentially of an identical construction like re~erence numerals have been applied thereto. The bead aligner wheels 40,41 each include opposing sealing surfaces 60,60 which are essentially normal to the axis of the bead aligner wheels 40,41 and to the axis of the screw 30. Radially outboard of each of the sealing surfaces 60,60 is a raised continuous uninterrupted circular ~ :
rib 61,61 (Figures 9 and 10) each of which is cooperative with a bladder 65 in a manner to be described more fully hereinafter.
Radially outboard of each rib 61,61 is a generally curved shoulder : or surface (unnumbered) which has formed therein a plurality of . .
bleed notches or grooves 62,62 each of which terminates at a .. :
bore 63 formed in a flange 64 of each bead aligner wheel 40,41. : ~.
The notches 62 and hores 63 cooperate with the bladder 65 in a manner to be described more fully hereinafter to bleed entrapped air from between an exterior surface of the bladder 65 and an interior surface of a tire T be.tween the matrices 56,57 to atmosphere during the pressurization of the interior of the bladder 65.
It is mandatory to preclude the bladder 65 from being pinched during the closing of the matrices 56,57 as well as during the closing of the bead aligner wheels 40,41 and accordingly, one or both of the bead aligner wheels 40,41 are .
provided with a plurality of axially projecting bosses 66 .
(Figure 9). In the embodiment of the invention illustrated ,i :
the bead aligner wheel 41 has four such bosses 66 and during the closing of the bead aligner wheels 40,41 the bosses 66 ~:
contact the sealing surface 60 of the bead aligner wheel 40 and ~ ;;
assure that the bladder disposed therebetween will not be pinched. The bosses 66 are also preferably disposed with their .::
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axis on a common circle ~uch that th0y alqo serve as means for looating ~h~bladder upon the bead aligner wheels ~0,41 as will be described more fully hereinafter.
.. . . .
Inasmuch as it is necessary in keeping with the ~ ;;
invention to inflate the bladder 65 a pressurized fluid, which is preferably heated air, is introduced into the space between the sealing surfaces 60,60 of the bead aligner wheels 40,41 through a part 67 which is in turn connected by a pipe 68, (Figure 1) and a flexible conduit 70 to a suitable source (not shown~ of pressurized fluid as, for example, hot air or a heated, non-explosive, non-compressible liquid or a source of steam o~ the like. Suitable conventional control means within ` a control panel 71 (Figure 1~ are provided for maintaining pressure internally of the bladder 65 at a desired level and suitable means may be provided for circulating the fluid media within the bladder 65. As an alternative. the fluid media n~d not be heated nor circulated within the bladder 65 and instead may be utilized simply to inflate the bladder 65 to a desired . ., ~
pressure with the heat required for the curing operation being achieved by conventionally heating the matrices 56,57 electrically or by the circulation of a heating fluid there-through.
Reference is now made specifically to Figures 6-8 of the drawings which more specifically illustrates the bladder 65 as a generally annul~ member of a U-shaped cross section (Figure 7) defined by a bight portion 72 and a pair of arms or legs 73,74 terminatlng in inboardmost terminal edges or beads 75,76 respectively. The cross sectional thickness of the Iegs - 73,74 is thickest adjacent the beads 75,76 and tapers pro-gressively ra~ially outwardly to a thinner though generally uniform cross sectional thickness in the area of the bight portion 72. This tapering permits the bight portion 72 to con~
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~orm to the in~erior configuration of the t.ire prior to outward progressive conformation of the legs 73,74 against the inner surface of the tire sidewalls, a~ will be described more fully hereinafter. ~n exterior surface 77 of the bladder 65 includes a plurality of radially directed raised ribs 78 between which are defined valleys 80 which serve as bleed or venting passages for air entrapped between the inner surface of the tire side-wall and the exterior surface 77 of the bladder 65 in con]unc-tion with the bleed grooves 62 and the notches 63 of the bead .. ~:
aligner wheels 40,41. In other words, as the bladder 65 is being inflated (Figure 10) the bight portion 72 thereof begins to progressively conform to the inner surface of the crown ::
(unnumbered) of the tire T and in doing so, air therebetween is forced toward the tire beads (unnumbered). Air which would otherwise be thus entrap.ped is expelled through th~ vents i8~
at least some or all of which are aligned with the notches 62 of the bead aligner wheels 41,42 resulting in the passage ~f th.is air to atmosphere through the bleed bores 63 of both bead .
aligner wheels 40,41. -20 ' In order to assure that the bladder 65 is pressurized the beads 75,76 of the bladder 65 have respective aligned notches 80,81 (Figures 7 and 8~. Therefore, upon the intro-duction of fluid into the bladder 65, in the manner indicated by the unnumbered headed arrows in Figure 10, the aligned notches .~
80,81 define port means for the introduction of such fluid into ~... .
the bladder 65, as well as the exhausting therefrom.
A highly important feature of this invention is the manner in which annular chambers A ~Figure 10) are formed .
between the sealing surfaces 60,60, the ribs 61,61 and the inboardmost portions of the arms 73,74 of the bladder 65. The significance of this featureis more specifically applicable-to full circle matrices, as opposed to segmented matrices. In the .~:
former the normal diameter of the tire T must be foreshortened _ g _ . ~
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in order that the full circle matrices may be closed without closing upon the tire T and/or assuring that the tire will be subsequently expanded from its foreshortened condition to seat properly within the full circle matrices. In order to fully appreciate this, reference is now made to Figures 4 and 5 of the drawings.
~ In Figure 4, the matrices 56, 57 are shown closed - and the inner surfaces thereof are in perfect conformity with the exterior of the tire T. The bladder 65 is, of course, pres-surized at this point and due to the pressurization thereof which is greater than atmosphere, the annular channels A are actually ; under a partial vacuum and therefore the beads 75, 76 are in hermetic sealing relationship with the surfaces 60, 60 of the ~ bead aligner wheels 40, 41 and a tight hermetic seal is achieved ;` between the ribs 61, 61 and the portions of the legs 73, 74 of the bladder 65 against which they contact. Therefore, upon the -~
opening of the matrices, which in this case are full circle ma~
trices, the parti~al vacuum within the annular chambers A holds the portions o~ the bladder legs 73, 73 inboard of the ribs 61, 61 tightly against the bead aligner wheels 40, 41. Accordingly, as the bead aligner wheels 40, 41 move away from each other, the diameter of the tire T is foreshortened (Figure 5) thereby per-mitting the matrices 56, 57 to be fully closed prior to the movement of the bead aligner wheels 40, 41 toward each other to `
achieve the positive seating between the tire T and the matrices, as shown in Figure 4. Thus, the built-up tire may be positioned in the manner shown in Figure 5 and when the bladder is pres- -surized, it will assume the position shown in this same Figure. ~ ~
, ~
Thereafter, and with the bead aligner wheels 40, 41 spread apart, the full circle matrices are closed and thereafter the bead aligner wheels may be moved to the closed position of Figure 4 incident to the performance of the curing operation.
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Another machin~ 10' con~3tructed in accordance with this invention is illustrated in Figures 11,12 and components thereof corresponding to those of the machine 10 of Figures 1 through ~, bear like reEerence numerals, though the same have been primed. In keeping with the construction of the machine 10, the same as matrices 56',57', but these are full circle matrices, not segmented. As compared to the machine 10, the machine 10' utilizes the aoncept of foreshortening a tire T' prior to the closing of the matrices, but the beads thereof are mechanically gripped in the manner illustrated in Figure 11. The mechanism includes a plurality of rods 90 passing through suitable guide bores (unnumbered) and terminating in angular ends 91. The opposite ends of the rods 90 are rotated and reciprocated by conventional apparatus.
The tire T' is inserted between the matrices 56', 57' when the latter and the platens 14',15' are in their Eully opened positions after which the bead aligner wheels ~0',41' are moved toward each other and the beads (unnumbered) of the tire T' are automatically located. Thereafter, the rods 90 are rotated from an out of the way position to the position shown in Figure 11, and the bead aligner wheels 40',41' are retracted to the illustrated position of Figure 11. The bladder 65' is then inserted in the manner illustrated in Figure 11 after `~which the full circle matrices 56',57' are closed. Once the latter are closed the bead aligner wheels 40',asll then move ~-~
toward each other to their final position (Figure 12j and fluid is introduced into the bladder 65' to pressurize the interior sufficiently depending, of course, upon the cure time, temperature, tire compound, etc. involved.
The machines 10 and 10' are provided with suitable control means including, of course, the control cabinet 71 and the components thereof which, for the most part, are con~
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ventional. How~ver, in keeping with this invention, the circuitry for the motor 21 inclucles a switch (not shown) carried by either of the platens 14,15 such that upon the closing of the latterl the switch will be activated to de-energize the motor 21. Preferably the switch actuates through a trip relay of a conventional construction on which the ampe~age may be adjusted to automatically shut off the drive motor 21 when the matrices 56,57 or 56',57' come together with sufficient force.
When the motor ~1 shuts off a conventional break automatically locks, although the latter is not an absolute requirement of the system. However, due to the adjustable nature of the rel'ay, it is necessary to adjust the distance between the platens at any time even if the matrices are changed or when spacers are inserted in a conventional manner, and this also makes the machines 10,10' self-adjusting.
While preferred forms and arrangements of parts have ; been shown in illustrating the in~ention, it is to be clearly understood that various changes in details and arrangements of ~, parts may be made without departing from the scope and spi~rit of this disclosure.
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This invention relates to novel retread molds adapted for manual, semi-automatic, or full automatic opera-tion preferably in bag or bladder retreading operations, and a primary object is the provision of a mold which is efficient in operation yet constructed with simplicity to enable opera-tion thereof by relatively untrained personnel with safety while providing long term machine life and obtaining retread tires of excellent quality.
A construction in accordance with the present invention comprises a retreading mold comprising a pair of relatively movable platens, each platen carrying a matrix ~- means. First and second bead aligner wheels are carried by a ~ 1 respective first and second of the platens. The bead aligner ;
wheels are in opposed relationship to each other. An annular bladder is disposed between the platens with the bladder .. :~ . -having first and second innermost peripheral marginal portions.
~; The first and second innermost peripheral marginal portions are in overlying relationship upon the first and second bead aligner wheels. First means are provided for creating a her~
metically sealed annular gap between the terminal edge of the first innermost peripheral marginal portion, an outboard por-tion of said first innermost peripheral marginal portion and said first bead aligner wheel. Second means are provided for ~ ~
creating a hermetically sealed annular gap between a terminal ~;
edge of the second innermost peripheral marginal portion, an outboard portion of said second innermost peripheral marginal portion and said second bead aligner wheel. -~;
The invention will now be described with reference to the accompanying drawings which show a preferred form thereof and wherein~
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. . .. . . . . .. . .: .... : . . .. .. . -: . :
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Figure 1 is a perspective ~ront view of a novel automatic retreading machine constructed in accordance with this invention, and illustrates a pair of platens in the open position thereof carrying segmented matrices with a tire located upon a lower bead aligner wheel.
Figure 2 is a front elevational view of the machine of Figure 1 partially in cross section, and illustrates the matrices closed and a bladder under pressure maintaining a tire to be retreaded in conformity with the interior of the matrices.
Figure 3 is a cross sectional view taken generally along line 3-3 of Figure 2. and particularly illustrates means for imparting motion to the bead aligner wheels and the drive for relatively moving the platens carrying the matrices relative to each other.
Figure 4 is a fragmentary enlarged sectional view of a tire positioned within the closed matrices.
Figure 5 is a fragmentary enlarged sectional view of a tire positioned within the opened matrices, and particularly illustrates ~3~manner in which a partial vacuum retains the 20 tire beads against the bead aligner wheels. ~ -Figure 6 is a fragmentary top plan view of the bladder associated with the machine of Figures 1 through 3, and illustrates raised ribs upon an exterior surface defining there-between vent means or passages terminating short of enlarged beads at inner ed~ges of the bladder. ;
Figure 7 is a sectional view taken generally along line 7-7 of Figure 6, and more fully illustrates the raised beads above the exterior surface of the bladder and notches in opposing ~
surfaces of the beads defining means for permitting the intro- , duction of fluid into and the removal of fluid from the~ ladder interior.
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Figure 8 is a fragmentary enlarged cro~s se~tional view taken along line 8-8 of Figure 6, and more fully illustrates the manner in which the notches of the bladder beads are in axial alignment.
Figure 9 is a view looking axially at one of the pair of bead aligner wheels of this invention, and illu~trates a circular continuous uninterrupted sealing rib and a plurality of venting grooves adapted to be placed in fluid communication with atmosphere through bores in a flange of the bead aligner wheels.
Figure 10 is an axial sectional view taken through a pair of the bead aligner wheels o the invention, and illustrates the manner in which fluid is introduced into the bladder as well as the manner in which air is vented to atmosphere from between the exterior surface of the bladder and an interior surface of a tire undergoing a recapping operation.
.
Fi~ure 11 is a fragmentary elevational view partially in section of a modification of the machine of Figures 1-~, and illustrates the manner in which the diameter of a tire is fore~
shortened by being mechanically clamped to the bead aligner wheels in lieu pf vacuum clamping to be described hereinafter~wiith respect to the machine of Figures 1-3.
Figure 12 is a sectional view identical to Figure 11 but illustrating the matrices in their closed position.
Reference is first specifically made to a machine 10 of Figures 1 through 3 which includes a conventional base 11 which has secured thereto in a conventional manner a pair of upstanding cylindrical supports 12,13. An upper platen 14 is , fixedly secured to an upper end portion (unnumbered) of the supports 12,13 by nuts (unnumbered) in the manner readily apparent from the upper right hand portion of Figure 2. The upper end portions (unnumbered) of the supports 12,13 are, of course, threaded to receive ~he nuts and the latter may be ~ -~
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adjusted or threaded to achieve aliynment between the upper fixed platen 14 and a lower movable platen 15.
The movable platen 15 is provided with conventional bushings (unnumbered) which surround the support~ 12,13 and thus the platen 15 may be readily moved between the open position (Figure 1) thereof and the closed position illustrated in Figure 2.
Means for imparting relative movement between the platens 14,15 is generally designed by the reference numeral 20 and includes an electric motor 21 connected to a suitable elec-trical source (not shown) which drives a sprocket 22 keyed to an output shaft 23 of a gear reducer 24. A drive chain 25 is ~ ~
entrained about the sprocket 22 and about a sprocket 26 (Figure 2) .:
suitably secured to a tubular stub shaft 27 which in turn is welded or otherwise secured to an internally threaded nut 28. A ~ :
reciprocal member 30 in t~e..~form of a screw is threaded within `. the nut 28 in the manner readily apparentf~:.o.m~Figures 2 and 3. `.
A lower end portion 31 of the screw 30 is capable of descending : ~.
into a suitable lubricant, such as Gil 0, maintained within a generally cylindrical reservoir or sump 32. Accordingly, upon .
the ascent of the screw 30, the oil deposited upon the end ~:
portion 31 will maintain the threads (unnumbered) of the nut 28 continuously lubricated during the reciprocal motlon imparted : to the platen 15.
An upper end portion 33 of the screw 30 is provided ; with means, generally designated by the reference numeral 35, ~ .
- for achieving self-centering between the platen 15 and the .
platen 14. The means 35 is simply a convex surface on the end `; ~.
portion 33 of the screw 30 which bears against a planar (unnumbered) surface of the platen 15. Thus, if there is any mis~
alignment of~a minor nature between the platens 14,15 and the .
matrices associated therewith to be described more fully herein- ~ :~
after,the-~platen 15 will tilt or cock as need be to an extent ' ~ ':
~4220 permitted by -the bushings (unnumbexed) associated with the supports 12,13 thus assuring alignment between the matrices and the tire therein. Furthermore, the platen 15 though of a relatively rigid construction can still flex somewhat under the force applied thereto by the screw 30 and this in turn achieves a self-adjusting or self-centering between the platens 14,15 and the matrices carried thereby.
An upper bead aligner wheel 40 and a lower bead aligner wheel 41 (Figures 2, 3 and 10) are reciprocally carried by the respective platens 14,15 and are mounted thereon for relative reciprocal movement toward and away from each other in a conventional manner. More specifically, a pair of fluid motors 42,43 carried by the upper platen 14 include identical ; pistons 44 (only one of which is illustrated in Figure 3) which are secured to the upper bead aligner wheel 40 for imparting motion thereto in a conventional manner. Likewise, fluid motors 45,46 carried by the lower platen 15 include piston rods 47 (only one of which is illustrated) for reciprocating the bead aligner wheel 41 in the manner readily apparent from Figure 3.
During the reciprocal motion imparted to the bead aligner wheels 40,41 guidance is provided by guide rods 50,51 secured to the bead aligner wheel 40 and by guide rods 52,53 (Figure 2) secured to the bead aligner wheel 41. The rods 50,51 and 52,53 are slidably received in tubular guides 54,55, res-pectively, (only one of each being shown in Figure 2) carried by the respective platens 14,15. -Conventional segmented matrices 56,57 are carried -~
by the platens 14,15 and are operative in a conventional manner.
~hough specifically utilizing segmented matrices 56,57, the machine 10 may be modified in the manner to be described hereinafter in order that the same can utilize "full" or non-segmented circular matrices.
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Reference i~ now made specifically to Figure 10 which illustrates the bead aligner wheel~ 40,41 in more specific detail. Since the bead aligner wheels 40,41 are essentially of an identical construction like re~erence numerals have been applied thereto. The bead aligner wheels 40,41 each include opposing sealing surfaces 60,60 which are essentially normal to the axis of the bead aligner wheels 40,41 and to the axis of the screw 30. Radially outboard of each of the sealing surfaces 60,60 is a raised continuous uninterrupted circular ~ :
rib 61,61 (Figures 9 and 10) each of which is cooperative with a bladder 65 in a manner to be described more fully hereinafter.
Radially outboard of each rib 61,61 is a generally curved shoulder : or surface (unnumbered) which has formed therein a plurality of . .
bleed notches or grooves 62,62 each of which terminates at a .. :
bore 63 formed in a flange 64 of each bead aligner wheel 40,41. : ~.
The notches 62 and hores 63 cooperate with the bladder 65 in a manner to be described more fully hereinafter to bleed entrapped air from between an exterior surface of the bladder 65 and an interior surface of a tire T be.tween the matrices 56,57 to atmosphere during the pressurization of the interior of the bladder 65.
It is mandatory to preclude the bladder 65 from being pinched during the closing of the matrices 56,57 as well as during the closing of the bead aligner wheels 40,41 and accordingly, one or both of the bead aligner wheels 40,41 are .
provided with a plurality of axially projecting bosses 66 .
(Figure 9). In the embodiment of the invention illustrated ,i :
the bead aligner wheel 41 has four such bosses 66 and during the closing of the bead aligner wheels 40,41 the bosses 66 ~:
contact the sealing surface 60 of the bead aligner wheel 40 and ~ ;;
assure that the bladder disposed therebetween will not be pinched. The bosses 66 are also preferably disposed with their .::
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axis on a common circle ~uch that th0y alqo serve as means for looating ~h~bladder upon the bead aligner wheels ~0,41 as will be described more fully hereinafter.
.. . . .
Inasmuch as it is necessary in keeping with the ~ ;;
invention to inflate the bladder 65 a pressurized fluid, which is preferably heated air, is introduced into the space between the sealing surfaces 60,60 of the bead aligner wheels 40,41 through a part 67 which is in turn connected by a pipe 68, (Figure 1) and a flexible conduit 70 to a suitable source (not shown~ of pressurized fluid as, for example, hot air or a heated, non-explosive, non-compressible liquid or a source of steam o~ the like. Suitable conventional control means within ` a control panel 71 (Figure 1~ are provided for maintaining pressure internally of the bladder 65 at a desired level and suitable means may be provided for circulating the fluid media within the bladder 65. As an alternative. the fluid media n~d not be heated nor circulated within the bladder 65 and instead may be utilized simply to inflate the bladder 65 to a desired . ., ~
pressure with the heat required for the curing operation being achieved by conventionally heating the matrices 56,57 electrically or by the circulation of a heating fluid there-through.
Reference is now made specifically to Figures 6-8 of the drawings which more specifically illustrates the bladder 65 as a generally annul~ member of a U-shaped cross section (Figure 7) defined by a bight portion 72 and a pair of arms or legs 73,74 terminatlng in inboardmost terminal edges or beads 75,76 respectively. The cross sectional thickness of the Iegs - 73,74 is thickest adjacent the beads 75,76 and tapers pro-gressively ra~ially outwardly to a thinner though generally uniform cross sectional thickness in the area of the bight portion 72. This tapering permits the bight portion 72 to con~
~8~22~
~orm to the in~erior configuration of the t.ire prior to outward progressive conformation of the legs 73,74 against the inner surface of the tire sidewalls, a~ will be described more fully hereinafter. ~n exterior surface 77 of the bladder 65 includes a plurality of radially directed raised ribs 78 between which are defined valleys 80 which serve as bleed or venting passages for air entrapped between the inner surface of the tire side-wall and the exterior surface 77 of the bladder 65 in con]unc-tion with the bleed grooves 62 and the notches 63 of the bead .. ~:
aligner wheels 40,41. In other words, as the bladder 65 is being inflated (Figure 10) the bight portion 72 thereof begins to progressively conform to the inner surface of the crown ::
(unnumbered) of the tire T and in doing so, air therebetween is forced toward the tire beads (unnumbered). Air which would otherwise be thus entrap.ped is expelled through th~ vents i8~
at least some or all of which are aligned with the notches 62 of the bead aligner wheels 41,42 resulting in the passage ~f th.is air to atmosphere through the bleed bores 63 of both bead .
aligner wheels 40,41. -20 ' In order to assure that the bladder 65 is pressurized the beads 75,76 of the bladder 65 have respective aligned notches 80,81 (Figures 7 and 8~. Therefore, upon the intro-duction of fluid into the bladder 65, in the manner indicated by the unnumbered headed arrows in Figure 10, the aligned notches .~
80,81 define port means for the introduction of such fluid into ~... .
the bladder 65, as well as the exhausting therefrom.
A highly important feature of this invention is the manner in which annular chambers A ~Figure 10) are formed .
between the sealing surfaces 60,60, the ribs 61,61 and the inboardmost portions of the arms 73,74 of the bladder 65. The significance of this featureis more specifically applicable-to full circle matrices, as opposed to segmented matrices. In the .~:
former the normal diameter of the tire T must be foreshortened _ g _ . ~
zz~ :
in order that the full circle matrices may be closed without closing upon the tire T and/or assuring that the tire will be subsequently expanded from its foreshortened condition to seat properly within the full circle matrices. In order to fully appreciate this, reference is now made to Figures 4 and 5 of the drawings.
~ In Figure 4, the matrices 56, 57 are shown closed - and the inner surfaces thereof are in perfect conformity with the exterior of the tire T. The bladder 65 is, of course, pres-surized at this point and due to the pressurization thereof which is greater than atmosphere, the annular channels A are actually ; under a partial vacuum and therefore the beads 75, 76 are in hermetic sealing relationship with the surfaces 60, 60 of the ~ bead aligner wheels 40, 41 and a tight hermetic seal is achieved ;` between the ribs 61, 61 and the portions of the legs 73, 74 of the bladder 65 against which they contact. Therefore, upon the -~
opening of the matrices, which in this case are full circle ma~
trices, the parti~al vacuum within the annular chambers A holds the portions o~ the bladder legs 73, 73 inboard of the ribs 61, 61 tightly against the bead aligner wheels 40, 41. Accordingly, as the bead aligner wheels 40, 41 move away from each other, the diameter of the tire T is foreshortened (Figure 5) thereby per-mitting the matrices 56, 57 to be fully closed prior to the movement of the bead aligner wheels 40, 41 toward each other to `
achieve the positive seating between the tire T and the matrices, as shown in Figure 4. Thus, the built-up tire may be positioned in the manner shown in Figure 5 and when the bladder is pres- -surized, it will assume the position shown in this same Figure. ~ ~
, ~
Thereafter, and with the bead aligner wheels 40, 41 spread apart, the full circle matrices are closed and thereafter the bead aligner wheels may be moved to the closed position of Figure 4 incident to the performance of the curing operation.
:~842Z~
Another machin~ 10' con~3tructed in accordance with this invention is illustrated in Figures 11,12 and components thereof corresponding to those of the machine 10 of Figures 1 through ~, bear like reEerence numerals, though the same have been primed. In keeping with the construction of the machine 10, the same as matrices 56',57', but these are full circle matrices, not segmented. As compared to the machine 10, the machine 10' utilizes the aoncept of foreshortening a tire T' prior to the closing of the matrices, but the beads thereof are mechanically gripped in the manner illustrated in Figure 11. The mechanism includes a plurality of rods 90 passing through suitable guide bores (unnumbered) and terminating in angular ends 91. The opposite ends of the rods 90 are rotated and reciprocated by conventional apparatus.
The tire T' is inserted between the matrices 56', 57' when the latter and the platens 14',15' are in their Eully opened positions after which the bead aligner wheels ~0',41' are moved toward each other and the beads (unnumbered) of the tire T' are automatically located. Thereafter, the rods 90 are rotated from an out of the way position to the position shown in Figure 11, and the bead aligner wheels 40',41' are retracted to the illustrated position of Figure 11. The bladder 65' is then inserted in the manner illustrated in Figure 11 after `~which the full circle matrices 56',57' are closed. Once the latter are closed the bead aligner wheels 40',asll then move ~-~
toward each other to their final position (Figure 12j and fluid is introduced into the bladder 65' to pressurize the interior sufficiently depending, of course, upon the cure time, temperature, tire compound, etc. involved.
The machines 10 and 10' are provided with suitable control means including, of course, the control cabinet 71 and the components thereof which, for the most part, are con~
- 11 - ~:
~8~2~
ventional. How~ver, in keeping with this invention, the circuitry for the motor 21 inclucles a switch (not shown) carried by either of the platens 14,15 such that upon the closing of the latterl the switch will be activated to de-energize the motor 21. Preferably the switch actuates through a trip relay of a conventional construction on which the ampe~age may be adjusted to automatically shut off the drive motor 21 when the matrices 56,57 or 56',57' come together with sufficient force.
When the motor ~1 shuts off a conventional break automatically locks, although the latter is not an absolute requirement of the system. However, due to the adjustable nature of the rel'ay, it is necessary to adjust the distance between the platens at any time even if the matrices are changed or when spacers are inserted in a conventional manner, and this also makes the machines 10,10' self-adjusting.
While preferred forms and arrangements of parts have ; been shown in illustrating the in~ention, it is to be clearly understood that various changes in details and arrangements of ~, parts may be made without departing from the scope and spi~rit of this disclosure.
. ~
.~.; .,
Claims (48)
1. A retreading mold comprising a pair of relatively movable platens, matrix means carried by each platen, first and second bead aligner wheels carried by a respective first and second of said platens, said bead aligner wheels being in opposed relationship to each other, an annular bladder disposed between said platens, said annular bladder having first and second innermost peripheral marginal portions, said first and second innermost peripheral maginal portions being in overlying relationship upon said first and second bead aligner wheels, first means for creating a hermetically sealed annular gap between a terminal edge of said first innermost peripheral marginal portion, an outboard portion of said first innermost peripheral marginal portion and said first bead aligner wheel, and second means for creating a hermetically sealed annular gap between a terminal edge of said second innermost peripheral marginal portion, an outboard portion of said second innermost peripheral marginal portion and said second bead aligner wheel.
2. The retreading mold as defined in claim 1, wherein each said bead aligner wheels include a surface upon which an associated peripheral marginal portion overlies, and said gap creating means is defined by two radially spaced annular lines of contact between each said peripheral marginal portions and its associated bead aligner wheel surface.
3. The retreading mold as defined in claim 1, wherein each said bead aligner wheels include a surface upon which an associated peripheral marginal portion overlies, said gap creating means is defined by two radially spaced annular lines of contact between each said peripheral marginal portions and its associated bead aligner wheel surface, an outboardmost one of said lines of contact is defined by an annular spacer between each said bead aligner wheel and its associated peripheral marginal portion.
4. A retreading mold as defined in claim 1, wherein each said bead aligner wheels include a surface upon which an associated peripheral marginal portion overlies, said gap creating means is defined by two radially spaced annular lines of contact between each said peripheral marginal portions and its associated bead aligner wheel surface, an outboardmost one of said lines of contact is defined by an annular spacer between each said bead aligner wheel and its associated peripheral marginal portion, each said annular spacers is an annular bead carried by each of said bead aligner wheels.
5. The retreading mold as defined in claim 1, wherein at least one of said first and second innermost peripheral marginal portions include groove means for introducing a pressurized media into said bladder.
6. The retreading mold as defined in claim 1, wherein each of said first and second innermost peripheral marginal portions include groove means for introducing a pressurized media into said bladder.
7. The retreading mold as defined in claim 1, wherein said first and second innermost peripheral marginal portions include groove means opening toward each other and into said bladder for introducing a pressurized media into said bladder.
8. The retreading mold a defined in claim 1, including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other.
9. The retreading mold as defined in claim 1, including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other, and said abuttingly contacting means is a projection carried by said at least one bead aligner wheel and projecting axially toward said second bead aligner wheel.
10. The retreading mold as defined in claim 1, including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other, and said abuttingly contacting means are a plurality of projections carried by said at least one bead aligner wheel and projecting axially toward said second bead aligner wheel.
11. The retreading mold as defined in claim 1 including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other, and said abuttingly contacting means are a plurality of axially projecting projections carried by each of said bead aligner wheels with said projections being in circumferentially offset relation-ship to each other.
12. The retreading mold as defined in claim 1 including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other, one of said bladder first and second innermost peripheral marginal portions including an axially outwardly diverted annular sealing bead in part defining one of said first and second annular gap creating means, and said abuttingly contacting means being a projection projecting axially toward said second bead aligner wheel a distance greater than the axial dimension of said annular sealing bead.
13. The retreading mold as defined in claim 1 including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other, each of said bladder first and second innermost peripheral marginal portions including an axially outwardly directed annular sealing bead in part defining said first and second annular gap creating means, and said abuttingly contacting means being a projection projecting axially toward said second bead aligner wheel a distance greater than the axial dimension of one of said annular sealing beads.
14. The retreading mold as defined in claim 1 wherein said first innermost peripheral marginal portion includes an axially projecting annular bead carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other, said abuttingly contacting means projects axially a distance greater than the axially projecting distance of said projecting annular bead to thereby prevent undesired distortion of the latter when said bead aligner wheels are in most adjacent relationship to each other.
15. The retreading mold as defined in claim claim 1 including means carried by at least one of said bead aligner wheels inboard of one of said first and second innermost peripheral marginal portions for contacting the latter and aligning the bladder relative to said bead aligner wheels.
16. The retreading mold as defined in claim 1, including means carried by at least one of said bead aligner wheels inboard of one of said first and second innermost peripheral marginal portions for contacting the latter and aligning the bladder relative to said bead aligner wheels, and said align-ing means are a plurality of projections projecting axially toward said second bead aligner wheel.
17. The retreading mold as defined in claim 1, including means carried by at least one of said bead aligner wheels inboard of one of said first and second innermost peripheral marginal portions for contacting the latter and aligning the bladder relative to said bead aligner wheels, and said align-ing means are a plurality of upwardly narrowing frusto-conical projections projecting axially toward said second bead aligner wheel.
18. The retreading mold as defined in claim 1, including vent means in each of said bead aligner wheels radially out-board of said annular gap creating means for venting an area radially outboard of the latter and between each bladder peri-pheral marginal portion and its associated bead aligner wheel to atmosphere.
19. The retreading mold as defined in claim 1, including vent means in each of said bead aligner wheels radially out-board of said annular gap creating means for venting an area radially outboard of the latter and between each bladder peri-pheral marginal portion and its associated bead aligner wheel to atmosphere, each of said bead aligner wheels including an outermost peripheral edge, and said vent means being disposed at said peripheral edges.
20. The retreading mold as defined in claim 1, including means for pressurizing the interior of said bladder and thereby creating a partial vacuum within said annular gaps with the resultant partial vacuums clamping said bladder marginal portions to the associated bead aligner wheels, and means for moving said bead aligner wheels relatively away from each other after the creation of the partial vacuums to thereby foreshorten the diameter of said bladder and a tire associated therewith prior to the closing of said matrix means.
21. The retreading mold as defined in claim 1, including means for pressurizing the interior of said bladder and thereby creating a partial vacuum within said annular gaps with the resultant partial vacuums clamping said bladder marginal portions to the associated bead aligner wheels, means for moving said bead aligner wheels relatively away from each other after the creation of the partial vacuums to thereby foreshorten the diameter of said bladder and a tire associated therewith prior to the closing of said matrix means, and means for relatively moving said platens from a spaced to a more closely adjacent position to close said matrix means while said bladder is in its foreshortened position.
22. The retreading mold as defined in claim 1, including means for imparting relative motion to said platens between first and second respective adjacent and remote relative posi-tions,first and second means for moving said first and second bead aligner wheels between first and second respective adja-cent and remote positions, said matrix means defining in the first position of said platens an annular chamber adapted to receive therein a tire to be retreaded, and said annular gap means further being under differential pressure relative to the interior of said bladder for clampingly urging each tire bead against its associated bead aligner wheel resulting in the reduction of the tire diameter upon the movement of said bead aligner wheels from their remote to their adjacent posi-tions.
23. The retreading mold as defined in claim 2, wherein at least one of said first and second innermost peripheral marginal portions include groove means for introducing a pressurized media into said bladder.
24. The retreading mold as defined in claim 2, including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other.
25. The retreading mold as defined in claim 2, including means carried by at least one of said bead aligner wheels inboard of one of said first and second innermost peripheral marginal portions for contacting the latter and aligning the bladder relative to said bead aligner wheels.
26. The retreading mold as defined in claim 2, including vent means in each of said bead aligner wheels radially outboard of said annular gap creating means for venting an area radially outboard of the latter and between each bladder peripheral marginal portion and its associated bead aligner wheel to atmosphere.
27. The retreading mold as defined in claim 2, including means for pressurizing the interior of said bladder and thereby creating a partial vacuum within said annular gaps with the resultant partial vacuums clamping said bladder marginal portions to the associated bead aligner wheels, and means for moving said bead aligner wheels relatively away from each other after the creation of the partial vacuums to thereby foreshorten the diameter of said bladder and a tire associated therewith prior to the closing of said matrix means.
28. The retreading mold as defined in claim 2, including means for imparting relative motion to said platens between first and second respective adjacent and remote relative positions, first and second means for moving said first and second bead aligner wheels between first and second respec-tive adjacent and remote positions, said matrix means defining in the first position of said platens an annular chamber adapted to receive therein a tire to be retreaded, and said annular gap means further being under differential pressure relative to the interior of said bladder for clampingly urging each tire bead against its associated bead aligner wheel resulting in the reduction of the tire diameter upon the move-ment of said bead aligner wheels from their remote to their adjacent positions.
29. The retreading mold as defined in claim 2, wherein said first and second innermost peripheral marginal portions include groove means opening toward each other and into said bladder for introducing a pressurized media into said bladder.
30. The retreading mold as defined in claim 2, including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other, and said abuttingly contacting means are a plurality of axially projecting projections carried by each of said bead aligner wheels with said projections being in circumferentially offset relation-ship to each other.
31. The retreading mold as defined in claim 2, including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a pre-determined distance toward each other, one of said bladder first and second innermost peripheral marginal portions including an axially outwardly directed annular sealing bead in part defining one of said first and second annular gap creating means, and said abuttingly contacting means being a projection projecting axially toward said second bead aligner wheel a distance greater than the axial dimension of said annular sealing bead.
32. The retreading mold as defined in claim 2, including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a pre-determined distance toward each other, each of said bladder first and second innermost peripheral marginal portions including an axially outwardly directed annular sealing bead in part defining said first and second annular gap creating means, and said abuttingly contacting means being a projection projecting axially toward said second bead aligner wheel a distance greater than the axial dimension of one of said annular sealing beads.
33. The retreading mold as defined in claim 2, wherein said first innermost peripheral marginal portion includes an axially projecting annular bead carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other, said abuttingly contacting means projects axially a distance greater than the axially projecting dis-tance of said projecting annular bead to thereby prevent undesired distortion of the latter when said bead aligner wheels are in most adjacent relationship to each other.
34. The retreading mold as defined in claim 5, including means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a pre-determined distance toward each other.
35. The retreading mold as defined in claim 5, including means carried by at least one of said bead aligner wheels inboard of one of said first and second innermost peripheral marginal portions for contacting the latter and aligning the bladder relative to said bead aligner wheels.
36. The retreading mold as defined in claim 5, including vent means in each of said bead aligner wheels radially out-board of said annular gap creating means for venting an area radially outboard of the latter and between each bladder peripheral marginal portion and its associated bead aligner wheel to atmosphere.
37. The retreading mold as defined in claim 5, including means for pressurizing the interior of said bladder and thereby creating a partial vacuum within said annular gaps with the resultant partial vacuums clamping said bladder marginal portions to the associated bead aligner wheels, and means for moving said bead aligner wheels relatively away from each other after the creation of the partial vacuums to thereby foreshorten the diameter of said bladder and a tire associated therewith prior to the closing of said matrix means.
38. The retreading mold as defined in claim 5, including means for imparting relative motion to said platens between first and second respective adjacent and remote relative positions, first and second means for moving said first and second bead aligner wheels between first and second respective adjacent and remote positions, said matrix means defining in the first positions of said platens an annular chamber adapted to receive therein a tire to be retreaded, and said annular gap means further being under differential pressure relative to the interior of said bladder for clampingly urging each tire bead against its associated bead aligner wheel resulting in the reduction of the tire diameter upon the movement of said bead aligner wheels from their remote to their adjacent positions.
39. The retreading mold as defined in claim 8, including means carried by at least one of said bead aligner wheels inboard of one of said first and second innermost peripheral marginal portions for contacting the latter and aligning the bladder relative to said bead aligner wheels.
40. The retreading mold as defined in claim 8, including vent means in each of said bead aligner wheels radially outboard of said annular gap creating means for venting an area radially outboard of the latter and between each bladder peripheral marginal portion and its associated bead aligner wheel to atmosphere.
41. The retreading mold as defined in claim 8, including means for pressurizing the interior of said bladder and there-by creating a partial vacuum within said annular gaps with the resultant partial vacuums clamping said bladder marginal portions to the associated bead aligner wheels, and means for moving said bead aligner wheels relatively away from each other after the creation of the partial vacuums to thereby foreshorten the diameter of said bladder and a tire associated therewith prior to the closing of said matrix means.
42. The retreading mold as defined in claim 8, including means for imparting relative motion to said platens between first and second respective adjacent and remote relative posi-tions, first and second means for moving said first and second bead aligner wheels between first and second respective adjacent and remote positions, said matrix means defining in the first positions of said platens an annular chamber adapted to receive therein a tire to be retreaded, and said annular gap means further being under differential pressure relative to the interior of said bladder for clampingly urging each tire bead against its associated bead aligner wheel resulting in the reduction of the tire diameter upon the movement of said bead aligner wheels from their remote to their adjacent positions.
43. The retreading mold as defined in claim 23, includ-ing means carried by at least one of said bead aligner wheels for abuttingly contacting a second of said bead aligner wheels to preclude said bead aligner wheels from moving beyond a predetermined distance toward each other.
44. m e retreading mold as defined in claim 23, includ-ing means carried by at least one of said bead aligner wheels inboard of one of said first and second innermost peripheral marginal portions for contacting the latter and aligning the bladder relative to said bead aligner wheels.
45. The retreading mold as defined in claim 23, includ-ing means for imparting relative motion to said platens between first and second respective adjacent and remote relative posi-tions, first and second means for moving said first and second bead aligner wheels between first and second respective adjacent and remote positions, said matrix means defining in the first position of said platens an annular chamber adapted to receive therein a tire to be retreaded, and said annular gap means further being under differential pressure relative to the interior of said bladder for clampingly urging each tire bead against its associated bead aligner wheel resulting in the reduction of the tire diameter upon the movement of said bead aligner wheels from their remote to their adjacent positions.
46. The retreading mold as defined in claim 34, includ-ing means carried by at least one of said bead aligner wheels inboard of one of said first and second innermost peripheral marginal portions for contacting the latter and aligning the bladder relative to said bead aligner wheels.
47. The retreading mold as defined in claim 34, includ-ing vent means in each of said bead aligner wheels radially outboard of said annular gap creating means for venting an area radially outboard of the latter and between each bladder peripheral marginal portion and its associated bead aligner wheel to atmosphere.
48. The retreading mold as defined in claim 34, includ-ing means for pressurizing the interior of said bladder and thereby creating a partial vacuum within said annular gaps with the resultant partial vacuums clamping said bladder marginal portions to the associated bead aligner wheels, and means for moving said bead aligner wheels relatively away from each other after the creation of the partial vacuums to thereby foreshorten the diameter of said bladder and a tire associated therewith prior to the closing of said matrix means.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA259,188A CA1084220A (en) | 1976-08-16 | 1976-08-16 | Retreading mold |
| CA356,770A CA1093770A (en) | 1976-08-16 | 1980-07-22 | Retreading mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA259,188A CA1084220A (en) | 1976-08-16 | 1976-08-16 | Retreading mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1084220A true CA1084220A (en) | 1980-08-26 |
Family
ID=4106670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA259,188A Expired CA1084220A (en) | 1976-08-16 | 1976-08-16 | Retreading mold |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1084220A (en) |
-
1976
- 1976-08-16 CA CA259,188A patent/CA1084220A/en not_active Expired
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| MKEX | Expiry |