KR820001882B1 - Tire building machine - Google Patents

Abstract

A tyre component servicer for a building drum conveys a component to an air floation tray with centring guides contacting the component edges, and a constant force spring motor urging the guides uniformly symmetrically towards the tray center line. The guides pref. comprise transverse rods on which two carriage are journalled for movement to and from each other, and edge guide rolls on each carriage. The cable pref. pass over adjacent sheaves and are then joined to a single cable connected to the motor.

Description

Tire molding machine

1 is a cross-sectional view showing a quartered portion of a once forming machine according to the present invention in which the tire carcass is expanded in an annular shape and the final position of the forming bladder is shown virtually.

FIG. 2 is a cross-sectional view similar to FIG. 1 but showing more concisely how the carcass is formed before and how the tire is molded by the negative crown method.

3 is an enlarged sectional view taken along line 3-3 of FIG. 1 or FIG.

4 is a partial perspective view showing a center deck capable of expanding and contracting in an axial direction by removing a rubber sleeve or cover.

5 is an exploded cross-sectional view of the three main parts of the center deck.

FIG. 6 is a side view seen from the line 6-6 of FIG.

FIG. 7 is a partial side view of the central support seen from line 7-7 of FIG.

8 is a partially enlarged sectional view of the bead lock in the expanded state showing the centering shoulder seal and the air passage series.

FIG. 9 is a cross sectional view similar to FIG. 8 showing a central deck extending axially prior to inflation or molding of a tire.

10 is a partial cross-sectional view of the retracted state of the bead lock used in a second stage molding machine having a similar bead lock.

FIG. 11 is a partial cross sectional view of the second stage molding machine as in FIG. 10 showing that both bead locks are drawn and a tire is formed therebetween.

12 is a partial cross-sectional view of a first stage molding machine according to the present invention using a center deck formed in a configuration similar to that used in connection with bead locks.

13 is a cross-sectional view of another type of first stage molding machine that can be used in the present invention showing a center deck of another formation.

The present invention relates to a tire molding machine, and more particularly to a tire molding machine in the form of a bead lock, in which a common part used as a single stage molding machine, a first stage molding machine or a second stage molding machine can be used. The present invention is particularly applicable to the production of large or medium tire tires, such as tires for trucks or recreational vehicles, but may also be used to produce small tires, such as tires for small passenger cars.

In conventional single-stage molding machines, the tires are produced in a continuous manner, initially being flat or cylindrically shaped, and then shaped into annular shapes for the final application of the belt and tread assembly.

In a first stage molding machine, the tire is manufactured in the form of a cylindrical or flat band and then transferred to a second stage molding machine where it is converted into an annular form for final adaptation of components such as belts and tread assemblies.

Whether the device is a single-stage, first-stage or second-stage molding machine, the tire beads must be correctly supported and fixed for the application of such components. In single stage molding machines or second stage molding machines, the bead locks move uniformly with each other when the tire is expanded and deformed into its annular or tire shape in its general cylindrical form.

Regardless of the type of molding machine used, the beads must be accurately fixed and positioned with respect to the transverse center line as well as the axial center line of the molding machine. It is also preferred that the beads from the transverse centerline across the crown of the tire provide the air seal so that the compressed air in the tire can mold the tire into the desired annular shape.

Radially expandable bead locks have been used in the manufacture of tires, examples of which are described in US Pat. have.

Also known are tire forming machines comprising radially expandable center decks, as shown in US Pat. Nos. 3,160,545, 3,784,437, and 3,740,293. Certain center decks are known in US Pat. Nos. 3,864,189 and 3,784,437. As shown in the figure, there is a reduction in the axial direction when the tire is inflated, and some are adjustable in the longitudinal direction as shown in US Pat. No. 3,647,598.

In the case of using the elastic bead lock, it is difficult to accurately control the expansion and contraction of the bead lock for accurate centering of the bead in the radial and axial direction because of the inherent characteristics of the rubber band. Long and narrow rubber bands are not sizeable under stress and non-stress conditions. In addition, it is difficult to supply inflation air pressure to such a bladder without undue limitation when the bead lock includes a molded blade formed integrally and thus prevents from performing its required function.

This bladder is always limited by an inlet drawn from a bind lock as shown in French Patent No. 2,227,121 or US Patent No. 3,721,600.

Moreover, in single-stage molding machines, it is desirable to apply tire components such as chafers, body ply or belt cushions, especially when producing large and complex tires.

Thus, between these bead locks, a center deck should be provided that is rigid over the entire length to allow axial shrinkage when the tire is molded in an annular shape.

In the present invention, a radially expandable form of elastic bead lock is used and can be used for either single stage, first stage or second stage operation on a common molding machine axis. The bead lock is formed with a shoulder interlocking with a shoulder stop that closely restricts the narrow portion of the bead lock so as not to radially and axially move during expansion. The bead lock is also provided with an air passage network which is used to flatten the bladder in communication with or integrally formed with the inside of the bead lock. This passage can be used to flatten the bladder without the installation of complicated hoses, pipes, etc., because the shoulder stops mentioned above form a seal seal for the expansion of the bead lock. The central main air passage and branch passage in the bead lock may have a garter spring that keeps the air passage always open even when the bead lock is inflated.

When used as a single-stage molding machine, a rigid center deck is used that can be axially expanded and retracted. The center deck consists of a series of axially inwardly extending fingers which are inserted and supported in the slot center of the rigid center support.

The molding machine of the present invention includes a double molding bladder assembly, and bead locks are integrally formed on the outside of the assembly and inflated therethrough. Bladders are in particular molded into the carcass as required for plies or other component parts so that they can be applied tangentially and continuously from the beads.

Another type of center deck is described as using a common component, and the center deck can be positioned radially inwardly in a fixed state so that the tire can be molded in the negative crown method.

It is therefore a main object of the present invention to provide a tire molding machine using radially expandable bead locks which are fixed exactly in the axial and radial directions with respect to the center line of the molding machine during expansion.

It is another object of the present invention to provide an elastic bead lock having a series of air passages used to expand a forming bladder in communication with or integrally formed with the interior of the bead lock.

Another important object of the present invention is to provide an inflatable bead lock that forms an air seal with respect to the interior of the bead lock upon expansion.

Still another important object is to provide a tire forming machine comprising a center deck that is capable of expanding and contracting in an axial direction in which there is actually no rigid sealing surface.

Another important purpose is a molding machine having a double bladder turn-up assembly which is manufactured in such a way that the outer bladder can add or wind components of the tire tangentially and continuously away from the tire bead. To provide.

Also important in the present invention is another aspect in which the present invention utilizes common components that can be easily assembled and disassembled on a common axis to provide a molding machine capable of manufacturing a tire in a first, second or single stage process.

When described in more detail by the accompanying drawings illustrating the present invention.

Single Stage Molding Machine (Fig. 1-9)

In FIG. 1 and FIG. 2, the tire molding machine 20 is shown which is tubular and mounted on the main shaft 21 in which the screw shaft 22 was hold | maintained. The main shaft is formed with a flange 23, and the screw shaft has a coupling 24 connected to the housing driving device on the right side of FIG. 1, which can rotate the main shaft and the screw shaft simultaneously or separately through a suitable clutch and brake device. ) Is installed.

At the outer end of the main shaft there is provided a guide protrusion 25 which can be supported by a retractable tail stock or by a carrier.

The screw shaft 22 includes keys 31 and 32 which protrude through the slots 33 and 34 and are fixed to the axially outer ends of the inner and outer sleeves 35 and 36, respectively. The threads 29 and 28 are provided in opposite directions in engagement with the nuts 29 and 30, respectively, and these sleeves slide on the outside of the main shaft 21.

With the exception of the center support 38 of the center deck 39, most of the components are supported on the sleeve so as to be axially slidable so as to constantly approach or move away from the transverse centerline 40 of the molding machine. . Other centerlines of the molding machine are the axes 21, 22 and the axes 41 of the sleeves 35, 36. In order to produce tires correctly, the tire components must be symmetrical and correctly assembled on both centerlines.

In addition to the center deck 39, the other major components of the molding machine are the inner and outer bead lock assemblies 43 and 44 and the inner and outer double bladder turn-up assemblies 45 and 46. Each double bladder assembly consists of a radial outer bladder 48 and an inner bladder 49. When contracted as shown in solid lines in FIGS. 1 and 2, the outer bladder is superimposed on the inner bladder, all of which are supported in a cylindrical state by a cylindrical can or extension 50. As shown, each bead lock assembly is composed of a large rubber band or rings 52, 53, and the outer bladder of each double bladder assembly is integrally formed therewith. The inner bead lock assembly is supported to allow radial movement between the flanges 55, 56 secured to the sleeve 36 while the assembly 44 is secured to the flange 35 secured to the sleeve 35. It is fixed so as to be movable between 55 and 58.

The flanges 55, 57 are fixed to the inner ends of these sleeves, and only the assembly 44 will be described in detail as these assemblies are identical except for minimal deformation.

8 and 9, the flange 57 is seated on the shoulder 60 on the outside of the sleeve 35, and is in place by the fixing ring 61 fixed to the inner end of the sleeve by the fixing bolt 62. It is fixed to. A zero ring seal 63 is provided between the flange and the outside of the sleeve, and a sliding seal 64 is provided between the sleeve 35 and the shaft 21.

The flange 58 is fixed on the shoulder 65 by a long, flanged sleeve 67 fixed to both the end of the sleeve 35 and the flange 58 by the fastener 68. In addition, a 0-ring seal 69 is provided between the inside of the flange and the outside of the sleeve. On the opposing surfaces of the flanges 57 and 58, there are formed inwardly protruding stop shoulders 72, and the outwardly protruding stop shoulders 73 are fixed by a fastener shown by the stop ring 74. . An inwardly protruding lip 75 is formed at the upper edge of each flange, and its lower side is in the form of an axially extending " S " curved surface 76. Therefore, this lip is formed with the curved outer edge and the cutting part which faces the axis line of the shafts 21 and 22 is formed.

Center deck

4-7 show a finger ring secured on the flanges 55, 57 in such a way that the center deck 39 in addition to the central support 38 is shown in more detail in FIGS. ring) 78, 79 is shown. Finger rings 78 and 79 are essentially the same shape, so only one finger ring 79 will be described in detail. In FIG. 5 this ring 79 comprises a cylindrical hub 81 having a ring 82 fixed at one end, which has a slot formed therein and an axially extending finger to the slot. Or bar 83 is welded. 72 fingers or bars are arranged at equal intervals in each ring. As shown in more detail in FIG. 4, these fingers have a circumferential arrangement. At the opposite end of the hub 81 an inward flange or wall 84 is formed which forms an inner shoulder, and a fastener 85 extending through the wall or flange is described in more detail in FIGS. 8 and 9. As shown, the ring 79 is fixed to the flange 57.

It should be noted that the flange 83 is slightly spaced apart from the outside of the cylindrical portion 81 of the ring 79. This spacing accommodates the cut edges 87, 88 of the cylindrical ring 89 of the central support 38. Such a ring is connected by web 91 to a discontinuous hub 92 mounted on shaft 21 by fastener 93 shown in FIG. This recess 94 of hub 92 accommodates a slide pipe or tube 95 that interconnects sleeves 35 and 36 as shown in a three-dimensional perspective view in FIG. The web 91 is also provided with an important circular opening 95 as shown in FIG. Outside the cylindrical ring 89, a series of slots 97 are formed evenly at regular intervals. If 72 fingers are formed in each fingering, the number of slots into which the fingers are inserted is 144. In the remaining slots the fingers of the opposite fingerings are inserted. The length of the slot is equal to the length of the finger and is slightly wider so that the finger can slide in the slot.

When the center deck is inflated as shown in FIGS. 4 and 9, the fingers of the opposing fingering will project slightly through the different slots 98 and 100, respectively. In the contracted state shown in FIG. 8, the fingers extend through the slot. In addition, as shown in FIGS. 8 and 9, the elastic rubber sleeve 102 is the outer side of the fingering by the transition rings 103 and 104 fixed in place by the fastening portion 105. It is gripped on the face.

This fingering and the slot of the center support provide a rigid structure for the elastic sleeve 102 that extends axially when the center deck is extended. As shown in Figure 4, the transition ring is formed with a cutout 106 to access the fastener. The outer side of the transition ring is formed by a conical portion 107 to form a relatively lubricated transition surface between the center deck and the bead locks 52 and 53 in the retracted state as shown in FIG. .

Bead Lock

8 and 9 illustrate a very narrow radially extending protrusion 110 in which the rubber band 53 constituting the bead lock 44 includes an arcuate bead sheet 111 on its outer surface. It is shown that the center of the bead sheet is slightly off toward the transverse centerline 40 of the molding machine. The band includes a middle width 112 of medium width, in the expanded state of the band such that the width is intimately installed with a slight gap between the rounded lips 75 of the opposite flanges 57, 58. It is.

Finally, the band receives the widest medial portion that connects the intermediate portions by a grooved shoulder 114 that receives the curved lip 75 and can be seated within the sigmoidal curved surface 76 of the grip. (113). Thus, upon inflation of the band, the band forms an air seal in each lateral state between the lip and the shoulder 114, and the shape of the lip and the shoulder centers the band to accurately center the band and secure the tire bead upon inflation. Keep it.

In band forming, the band is cast together with the air passage 116 of the circumferential yarn and a reinforcing material 117 such as a garter spring located therein. The garter spring may be embedded in the band by band forming into two separate parts prior to vulcanization.

The outer shaping bladder 48 is integrally molded with the band 53, and the upper or inner wall 120 of the bladder is attached to a point 121 close to the inside of the bead sheet 111. As shown in FIG. In this way, the wall of the bladder adjacent the point of attachment actually forms a bead sheet. Bottom wall 122 is the narrowest portion 110 of the band slightly away from top 123 to provide a gap for diagonal passage 124 extending from air passage 116 into the bladder interior. It is fixed to the outside of the.

Inside the band 53, a series of diagonal passages 128 for connecting the grooves to the two circumferential grooves 126, 127 and the central air passage 116, which are spaced apart in the axial direction, respectively, 129 is formed. In molding, a series of inserts 131 are embedded in the band, and each of the inserts has a blind hole formed therein so that the deck plate body 132 may be fixed to the inside of the band by the fastener 133. Upon inflation of the band, the plate is circumferentially separated to expose the grooves 126, 127 in the chamber 135. Also, upon inflation, the edges of the plate body 132 engage with a gauge ring 74 to inflate precisely to a given total indicator runout (T. I. R). The bead lock thus first grips the inner diameter of the bead, then ascends to form a seal for the lip 75 to ensure the correct axial position, and finally the plate is within a given tolerance of the axis 41. Engage with gauge ring 74 to achieve the TI R described above.

In the band, an inner flipper 136 is formed integrally on the center deck 39 integrally. This flipper acts to protect the inner seal surface from dust or foreign material common in tire building equipment.

The band is inflated by a tubular body 137 comprising an insert 138 connected to a mounting opening 139 fitted snugly in the transverse passage 140 of the sleeve. The tube 137 expands when air is supplied through the passage 141.

While not part of the bead lock, the inner bladder 49 has an annular contour and a stem 143 is provided in the molding process. Mounting port 144 is connected to the stem to expand the interior of the bladder through air supply pipe 145. The stem extends through the can 50 and assists in positioning and assembling the bladder. As shown, the can is fixed to the outside of the flange 58. Preferably, the inner bladder 49 includes a belt or band 146 that is shaped during the tube forming process. This belt or band restrains the bladder to support a portion of the inner wall relative to the can when the bladder expands. In general, bladder tends to be circular on the centerline of the stem. However, the expansion of the bladder by the restraint band can be properly adjusted to apply component parts such as sidewalls and to surround the tire material around the beads. The outer bladder 48 supplies the air under pressure through the passages 148 and 149 to the hermetic chamber 135 in communication with the outer bladder through the passage of the bead lock band as already mentioned. When the id lock is expanded, it will expand. In this way the outer bladder is released in a restrained state from the stem or mounting opening and can act properly to wind up or apply tire components as described below.

In order to inflate the tire carcass in the annular form shown by way of example in FIG. 1 or 8 as compared to FIG. 2 or FIG. It is fed into the chamber formed by the seals of the bead lock. This chamber is indicated by reference numeral 152, and air is supplied to this chamber through the vent 153 of the sleeve 36.

Since the elastic sleeve 102 surrounding the center deck 39 is not a molding bladder, an air outlet 154 is formed so that the pressure in the chamber 152 is applied directly to the interior of the tire carcass T. Of course, the elastomeric sleeve may be a molded bladder, in which case it is a form without a hole.

Operation of single stage molding machine

In a single stage tire forming machine, various forming processes or steps may be used depending on the components used in the tire. For the purpose of explaining this, we briefly refer to the continuous steps used when manufacturing relatively large truck tires.

In the starting stage, the center deck is expanded as shown in FIG. 2 and the forming bladder and bead lock are evacuated. In this starting state, the molding machine takes the form of a generally long, cylindrical drum having a diameter slightly smaller than the inner diameter of the bead of the tire to be molded.

In this state, the inner edge 160 of the inner bladder 49 is flat and adjacent to the shoulder 161 of the bead lock band at its retracted position, the surface thus shown as shown in FIG. It is generally cylindrical.

Initially, the operator carefully centers the drum with respect to the transverse centerline 40 and places an inner liner thereon, followed by a wire chaper. Deploy tire components such as body plies, sidewalls and belt cushions.

The body ply of course then extends axially beyond the rear of the bead lock. The side wall is applied directly to the contracted cylindrical or flat outer bladder 48. The belt cushion is sutured to the body ply but becomes a fillew between the belt and the body ply when the tire has been molded. After these components have been applied and the required seals have been completed, a bead mounting device is used to accurately position the beads relative to the bead lock. The bead lock is expanded into the bead as shown in detail in FIGS. 2 and 9. As can be seen in this figure, the body ply extends or expands to a portion of the bead when the bead lock expands.

In the manufacture of radial tires, the cord or reinforcement of the body ply extends in the axial direction of the drum and evenly wraps the body ply to the bead site in order to wind the ply evenly so as not to be crushed or wrinkled around the bead B. Need to be extended. This is of course done by the expanded bead lock since the diameter of the body ply of the bead site is larger than the diameter of the ply in the crown or transverse centerline 40. The process shown in Figures 2 and 9 is known as "negative crown" molding.

After the beads are secured, the apex or filler of the beads may be applied inside the beads. Some beads already contain vertices or fillers in the beads themselves.

At this point, the tire carcass T can simply be pre-inflated to free the carcass from the sleeve 102 of the deck 39. In this preliminary expansion the carcass is inflated outward with the same degree of expansion as in the negative crown shown in FIGS. 2 and 9. The outer bladder 48 can be preexpanded here to prevent the beads from moving.

When the bead locks remain inflated, the carcasses preform about 80% of their final form, as shown in FIG. This can be done by fixing the main shaft 21 while the screw shaft 22 is rotating. The center deck 39 automatically contracts along the axial direction when the carcass is expanded and the bead locks move evenly toward each other. At this time, the correctly retracted belt or belt-tread assembly is moved in the axial direction of the molding machine to the transverse centerline 40.

The belt is indicated by reference numeral 165 in FIGS. 1 and 8. In this position the belt is held by the mover at the transverse centerline 40 and the carcass is fully molded into the interior of the belt.

The outer bladder 48 is then fully inflated to wrap the body ply around the beads. Initially the outer bladder 48 is inflated, which, when inflated, is pressed against the outside of the tire T and moves uniformly and continuously from the bead B to the position 166 shown in FIG.

In this state, the bead portion is tightly wrapped and the sidewall located on the outer bladder 48 begins to bond.

The inner bladder 49 is inflated to squeeze the outer bladder 48 and the sidewalls held by it, so that the sidewalls of the carcass as shown by positions 167, 168, 169, 170 of the imaginary line. Raise tangentially along.

When both bladders are fully inflated, the outer edges of the side walls are attached as indicated by the arrows in FIG. 8 when the side walls themselves are turned inward.

When the inner bladder is retracted, the bladder returns to its original cylindrical flat state. The outer bladder, however, is inflated or partially inflated to securely hold the beads during the closure step. When both bladders are retracted, the bead lock also retracts and the tire is removed. The bead lock then returns to its original position where other tires are made.

If necessary, an additional sealing process can be performed before the tire is discharged.

It will be appreciated that the steps described above may vary considerably and the results may also vary.

For example, some tires are molded with side walls disposed on the treads and others are molded with treads placed on the side walls. In the latter case the side walls are applied before tread molding. The belt or belt-tread assembly may also be molded directly onto the shaped carcass or band as it is rotated with the tires formed.

Although not shown in detail, the molding machine of FIGS. 1-9 can simply be used as a first stage molding machine or a second stage molding machine. In the former case, the center deck does not shrink and the bead locks do not move towards each other. The double bladder assembly simultaneously expands to wind the ply around the beads. The bead lock then discharges the unmolded tire band. The tire band is also finished molding in the second stage molding machine as described below.

The components, such as the sidewalls and the belt cushions, are sealed to the bands of the cylinder prior to molding due to the rigid nature of the center deck upon inflation.

Second Stage Molding Machine (10 and 11 degrees)

First, in Figure 11 it is shown that common components are used on the same axis to provide an inflatable bead lock forming machine for deforming a cylindrical tire band or carcass into an annular shape. The same sleeves 35 and 36 are used with the flanges 55 and 56 mated with the sleeve 36 and the flanges 57 and 58 mated with the sleeve 35. The bead locks 180, 181 consist of elastic bands 182, 183 formed with large shoulders that are essentially similar to the bands 52, 53 of a single-stage molding machine and can be molded in the same mold. do. However, the bands do not have integrally formed molding bladders. The middle part of the band forms an air seal upon inflation of the bead lock by a tube 137 inserted precisely between the curved lips formed in each pair of flanges and supported by a plate body mounted inside the band. FIG. 11 shows the bead locks 180, 181 which expand and move by stretching the tire T toward each other to form an annular shape, while FIG. 10 shows the retracted bead lock 180. FIG.

When the bead lock is inflated, an air seal is formed between the stop flange and the band to make the chamber 185 airtight in the tire. The air under the input is then supplied to the chamber through the opening 186 when the expanded bead locks move symmetrically and evenly towards each other with respect to the transverse centerline 40 of the molding machine.

In order to facilitate loading and discharging of the molding machine, guides 187 and 188 including conical guide surfaces 189 and 190 are mounted on the outer sides of the flanges 58 and 5. This guide helps the operator to place the tire carcass on the molding machine and to remove the molded tire. Such snacks are particularly useful in connection with the production of tires for trucks that are relatively large.

The air passages 192 and 193 of each band are used in a single stage molding machine for expanding the bladder, but are also used in a second stage molding machine so that the sealed chambers 194 and 195 can communicate with the atmosphere. This precludes the creation of excess pressure that would interfere with the correct operation of the bead lock. In addition, the chamber may be exhausted through the normally closed through-hole 198.

First stage molding machine (12th and 13 degrees)

12 and 13 show two types of bead locks and the first stage forming machine using the double bladder assembly as those associated with the single stage molding machine of FIG. The body ply is secured to be wound around the beads and then inflated. In the first stage molding machine, the bladder is usually inflated at the same time. Such bladder may be used in connection with a reaction member which is fixed or axially movable in a known manner.

In FIG. 12, fastening to a buried molded insert 204 in the outer periphery of the rubber band 205 with relatively large shoulders is formed in order to support the tire carcass in manufacturing and when closure is required after the ply is wound up. A radially expandable center deck 200 is provided that includes a relatively thick elastic outer sleeve 201 supported by several axially extending tubular bodies 202 fixed to a sphere 203. Band 205 is generally similar to the internal components of band 53 and is molded from the same mold.

At the inner circumference of the band 205, an insert 207 to which the plate body 208 is attached is formed. The side edges of the plate body are formed with protrusions inserted into the radially extending slots 209 of the flange 201, and the flange is mounted on the sleeve 211. The structure of the stone piece and the slot prevents the center deck from rotating according to the rotation of the drum. Relative radial motion is achieved by one or more inflatable tubes 212 around the sleeve 211. This tube is identical to the tube 137 for the bead lock.

In the embodiment shown in FIG. 12, the center deck 200 expands and contracts like a bead lock. The requirements are repeated two or three times, depending on the axial length of the deck, and the band and tube fabrication to achieve the required axial length.

As shown in FIG. 13, the center deck 220 has components 210, 202, 210, 208, 209, 211, 212 similar to those for the deck 220. ) Is used.

However, instead of the band 205, the garter springs 221, 222 having a rectangular cross section extending between the plate body 208 and the relatively heavy plate body 202 are used. However, a radially expandable center deck is provided that can be moved relative to or with the inflatable bead lock.

It will be appreciated that the tire molding machine of the present invention, in a more preferred embodiment, produces a tire, such as a relatively heavy truck radial tire, in a single stage. Although this embodiment may be single stage, it can of course also be used as a first stage or second stage molding machine. Also provided by the present invention are first and second stage molding machines which can utilize component parts that can be used and interchangeable with single stage molding machines.

Claims (1)

And a means for expanding a radially expandable bead lock, a forming bladder and a forming bladder through the bead lock.

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