Abstract: The sector mold (11) is designed so that, during the molding phase, the molding elements (10, 10a, 10b, 10c) are all equidistant due to devices (13) which assure an elastic repulsion between each other. Some of the elements glide circumferentially with respect to their sector (11) in the final closing phase. In this way, pinching of the rubber between sectors and the appearance of molding burrs are avoided.

Abstract: The tire mold includes a peripheral ring split into two parts (G and D). The peripheral ring is laminated. It consists of a stack in the circumferential direction of a number of thin adjacent elements (1) made, for example, of metal sheets. The elements are of two different types: standard elements and intermediate elements, which follow on from one another circumferentially. The mold includes alignment means interacting with said intermediate elements in order to impose an orientation with respect to the radial direction on said intermediate elements. These means are, for example, grooves in which the intermediate elements are engaged.

Abstract: A molding apparatus and process is described in which a side wall mold insert is accessible and releasable from the interior of the molding apparatus. A fastener reversibly seats the side wall insert to the mold frame, the insert having an inclined rim wall for engaging a complementary-shaped wall of an adjacent tread mold piece. The process and apparatus facilitates the rapid replacement of a side wall mold insert without disassembly or cooling of the molding components.

Abstract: A spin casting apparatus, method of manufacture for producing a molded article from a polyurethane material, shown as a non-pneumatic tire, where a mold that is formed in sections or halves and has an inner cavity formed to have the shape of the article to be manufactured and is separable to release that article after manufacture. The mold is secured to a support plate of the apparatus that is journaled to turn axially imparting a centrifugal force into the mold. The support plate is connected to or is arranged to be connected to a motor assembly for turning, and includes a clamping arrangement for maintaining the mold halves together on the support plate. An annular trough is formed in the mold immediately adjacent to a mold interior cavity inner circumference to receive a polyurethane material liquid passed thereto, and to, in turn, pass that liquid through a trough annular opening or ports into the mold cavity.

Abstract: A vertical tire press has a lower mold fixed to a lower platen mounted on a base, and an upper mold facing the lower mold and fixed to an upper platen mounted on a top slide. The top slide is moved vertically by a crank mechanism, thereby closing together or opening apart the upper and lower molds. The lower or upper platen has a cylinder structure so as to squeeze together the upper and lower molds. This vertical tire press basically employs a crank mechanism, but is free from disadvantages peculiar to a tilt-back type tire press. The vertical tire press provides good economic performance as well as advantages of an oil-hydraulic type tire press, i.e. uniform application of a squeezing force and easy adjustment of the squeezing force, without using an oil-hydraulic cylinder.

Abstract: A tire vulcanizing mold assembly includes an upper flange disposed on an outer peripheral portion of an upper mold of a tire vulcanizing mold or an upper flange disposed in the outer peripheral portion of a plate into which the upper mold is assembled, a lower flange disposed in an outer peripheral portion of a plate into which a lower mold is assembled so as to go up and down, and a lock ring which is rotatably assembled into one of the respective flanges and detachably engaged to the other flange, wherein one end portion of a pressurizing unit is detachably engaged to the plate, an output shaft is engaged onto the other end portion of the pressurizing unit so as to abut against the lower mold through the plate portion, and when the tire vulcanizing mold is closed so that the respective flange portions are coupled to each other by the lock ring, a mold opening force due to the inner pressure of the tire vulcanizing mold is prevented.

Abstract: A tire vulcanizing system includes a vulcanizing station in which a plurality of sets of tire molds for vulcanization are arranged; a mold opening/closing station having a mold opening/closing device for opening/closing the tire mold, a loader for inserting an unvulcanized tire into the tire mold, and an unloader for removing a vulcanized tire from the tire mold; and a transferring device for transferring a tire mold between the vulcanizing station and the mold opening/closing station.

Abstract: Mold for a tire or for an annular tread member of a tire, including a mullicity of sectors moving radially and closed by the axial displacement of a crown coming to act upon the frusto-conical sector seats, and of an annular element, midway between the crown and the sector seats, intended to permit axial retraction of the crown when the internal pressure in the cavity of the mold exceeds a given threshold of pressure.

Abstract: The tire mold includes a shell for the molding of the sidewalls, said shell including a laminated assembly formed of lamelliform elements directed substantially parallel to the axis, the molding surface for said sidewall being formed by the adjacent edges of the said lamelliform elements.

Abstract: A pneumatic tire and a method of making the same are disclosed, wherein the tire is made by vulcanizing a green tire in a split mold. The mold has circumferentially extending split lines at a position corresponding to the tire buttress region. The inner surface of the mold is provided with protrusions immediately radially outside the split lines and ribs immediately radially inside the split lines, so that the vulcanized tire is provided with depressions and grooves corresponding to the protrusions and ribs, respectively. Therefore, the raw tire rubber does not get between the split faces of the mold, and the occurrence of burrs along the mold-split lines can be completely prevented.

Abstract: Disclosed is a tire press used for manufacturing a tire, in which a mechanism for clamping a closed mold is simplified. An upper heating unit for heating an upper-half mold has a cylinder structure in which a heating medium receiving member and a movable heat transfer member are provided. By supplying the heating medium to the heating medium receiving member, the upper-half mold can be heated via the movable heat transfer member, and the pressure from (clamping action) can be applied on the upper-half mold by the movable heat transfer member.

Abstract: A tire press in which a pair of upper and lower molds are opened/closed and squeezed by an operation of a crank mechanism is disclosed. Especially, the tire press is improved in the aspects of its machine accuracy, strength, size, and maintenance. The tire press has: a pair of upper and lower molds; a base for supporting the lower mold; side frames on both sides of the base; a side slot vertically extended in each of the side frames; a top slide which slides along the side slots and holds the upper mold; and a crank mechanism for moving the top slide only in the vertical direction. The crank mechanism includes: a crank gear; a lever attached to the crank gear and whose front and is positioned on the outer side of the outer diameter of the crank gear; and a link connecting a crank fulcrum at the tip of the lever and the top slide sliding along the side slots. The side slot vertically extends parallel to a vertical central line crossing the center of rotation of the crank gear and the crank fulcrum.

Abstract: In the present invention, when a tire is vulcanized, a flange fixed to either one of a top plate of a split mold and a piston rod tip end of a split mold opening/closing cylinder is held by operating fingers. The fingers are assembled in such a manner to be capable of oscillating in the holding direction by the return force of a spring. The top plate is connected to a piston rod of the split mold opening/closing cylinder. Thereupon, the split mold is opened and closed by the output of the split mold opening/closing cylinder and the vertical movement of a bolster plate. When the split mold is replaced, holding is released by oscillating the fingers by using a finger driving device, by which the top plate is separated from the piston rod of the split mold opening/closing cylinder.

Abstract: A tire vulcanizing system comprising (a) a tire vulcanizing press having a plurality of molding stations (b) a tire loader for loading tires onto the molding stations and (c) a tire unloader for unloading tires off of the molding stations, wherein the tire vulcanizing press comprises a fixed frame upon which the fixed molds of each molding station are mounted, a displaceable frame upon which the displaceable molds of each molding station are mounted, a tie-rod arranged between the molding stations and connecting the fixed frame to the displaceable frame, lifting cylinder for vertically displacing the displaceable frame along the tie-rod with respect to the fixed frame, half blocks for securing when necessary the displaceable frame to the tie-rod, thereby securing the displaceable frame to the fixed frame, and clamping means for forcibly clamping said displaceable molds to said fixed molds during tire vulcanization.

Abstract: A tire vulcanizing mold is divided into an upper-mold and a lower-mold in the tire axial direction. The upper and the lower molds have a base part with a molding surface for a tire-bead and a tire-sidewall, and a tread ring part with a molding surface for a tire-tread and a tire-buttress. The tread ring part is divided by radial split surfaces into a plurality of tread segments supported on the base part tiltably around a center line in the tangential direction of a circle centered on the tire axis between the reference position, where the radial split surfaces of the tread ring part contact to each other, and a releasing position, where the radial split surfaces are separated to each other.

Abstract: A tire vulcanizing apparatus has a mold body divided into a first mold portion and a second mold portion by a line perpendicular to an axis of a tire. The apparatus includes a device for opening or closing the mold body to mount the tire on the mold body and remove the tire from the mold body. A heat pressure medium is supplied into the tire mounted on the mold body in a vulcanizing station to vulcanize the tire. The mold body is arranged to receive and vertically hold the tire therein. A plurality of vulcanizers are disposed side by side in the vulcanizing station to vulcanize the tire. Each vulcanizer detachably accommodates the mold body. The vulcanizer supplies the heat pressure medium into the tire held in the mold body. The device is movable to positions respectively opposite to the vulcanizers. The mold body is movable between the device and the vulcanizer opposite to the device.

Abstract: Tire recapping or retreading apparatus and method including the use of a tread mold with a plurality of mold segments. A tread mold loading machine is used to position a prepared tire carcass or built tire relative to the mold segments and to install the mold segments on the exterior of the built tire. The mold segments are retained in place on the exterior of the tire carcass by a pair of tension springs. The tension springs hold the mold segments on the tire carcass after the mold segments have been released from the tread mold loading machine. The use of the tread mold loading machine and the mold segments eliminates distortion of the tire carcass during installation of the tread mold on the exterior of the built tire.

Abstract: The sector mold (11) is designed so that, during the molding phase, the molding elements (10, 10a, 10b, 10c) are all equidistant due to devices (13) which assure an elastic repulsion between each other. Some of the elements glide circumferentially with respect to their sector (11) in the final closing phase. In this way, pinching of the rubber between sectors and the appearance of molding burrs are avoided.

Abstract: A tire vulcanization apparatus in which an encaser 3 makes it possible to introduce a tire into a mold 1 and, by means of inductors 42, transfers to the mold heat energy necessary for vulcanization and in which a chamber 5 receives several molds 1 and makes it possible to maintain each mold insulated from the environment in order to limit heat losses during the time necessary for the vulcanization.

Abstract: A force to separate the mold portions for both sides of a tire, created by the pressure of a heating/pressurizing medium introduced into the tire during the vulcanization of the tire, is offset via an upper disk, a segment having protrusions at both ends, and a lower disk. A force in the radial direction to move a tread mold outward is offset via the segment. A component of force in the axial direction (vertical direction) of a radial force, created by the interposition of a sliding inclined surface between the segment and the outer ring is offset via the outer ring, a cover plate, locking claws, the upper disk, and the segment.

Abstract: An apparatus for providing a vacuum in a segmented tire mold includes an upper sidewall assembly and lower sidewall assembly, a plurality of radially moveable tread mold segments operable with the upper sidewall assembly and lower sidewall assembly to define a tire mold cavity. A conical actuating ring assembly surrounds the tire mold segments and engages the mold segments to provide radial movement of the mold segments. The apparatus includes a first seal between the conical actuating ring assembly and the lower mold assembly, as well as a second seal between the conical actuating ring and the upper sidewall assembly, thereby sealing the space defined by the tire mold so that a vacuum can be drawn on the tire mold cavity upon the closing of the mold.

Abstract: Apparatus for forming a tread pattern on a retread tire casing includes a plurality of rigid matrix segments each having a contoured tread pattern thereon. Each matrix segment is removably secured to a respective matrix segment holder. Each matrix segment holder includes guide blocks at the ends thereof, and the matrix segments are arranged in circumferential side-by-side relation. Guide shafts extend through aligned guide bores in adjacent guide blocks of adjacent matrix segment holders for guiding movement of matrix segment between a closed position wherein the matrix segments are in side-by-side abutting relation, and an open position wherein adjacent matrix segments are separated. A spring is received over each end of each guide shaft and captured between a recessed shoulder in the guide block and a threaded nut received over the end of the guide shaft. The springs normally bias the matrix segment into the closed position.

Abstract: The peripheral ring of a sector mold for tires is formed of an assembly of plates 1 resting against each other and stacked in such a manner as to push each other back. The ring therefore has a continuous tendency to increase in diameter. This tendency is resisted, for instance, by a conical hoop which simultaneously pushes all the plates 1 radially in the molding direction.

Abstract: A tire vulcanizing press of the present invention uses a split die device having an upper disk to which an upper die portion for molding the tire side is attached, a lower disk to which a lower die portion for molding the tire side is attached, divided segments to which a split tread die portion for molding the tire tread is attached, and an outer ring which has an inner inclined surface corresponding to the outer inclined surface of the segment and are slidably engaged with the outer inclined surface. Each of the divided segments has protrusions at the upper part and the lower part so that outward forces applied to the die portions during vulcanization are received by the protrusions of the segments.

Abstract: A vulcanizer constructed in that a body structure which is wide in the vertical direction is provided above a lower frame for supporting a lower mold in such a manner that an opening/closing and tightening mechanism is disposed below a laterally extending plane of an upper mold and a lower mold. Accordingly, there is no opening/closing and tightening mechanism in the periphery of a radial direction of the upper and lower molds, which makes it possible to utilize a split mold of a complex shape.

Abstract: A tire curing press has a cross beam that carries the upper mold section and is moved to open and close the press. When the press is closed, a cross beam locking mechanism located in the middle of the cross beam holds the cross beam to the tire press base that carries the bottom mold section. The locking mechanism prevents bending or bowing of the cross beam which would otherwise adversely affect the quality of the tires produced in the press.

Abstract: A method and a device for producing pneumatic vehicle tires in a radially divided vulcanization mold provides a space for the excess rubber material outside of the tire contour to be vulcanized and thereby improves the trueness of the vulcanized tire.

Abstract: A tire mold having an upper mold section and a lower mold section with mold segments mounted for sliding movement radially and axially between molding positions and unloading positions of the tire. Springs are provided between the mold segments and the mold sections for urging movement of the mold segments into molding positions and permitting movement of the mold segments into unloading positions for releasing the tread portion of the tire so that it will not be damaged upon opening of the mold.

Abstract: A tire vulcanizing press is provided, which is of high accuracy, eliminates the adjustment for a guide member, and reduces the area to be machined. The tire vulcanizing press comprises a main body frame including a lower frame, and at least one side frame erected on the lower frame; a lower mold mounting member mounted on the lower frame for fixing a lower mold; an upper mold mounting member for fixing an upper mold in surface-contact with the lower mold; a guide member disposed on one side of the upper mold mounting member for supporting the upper mold mounting member on the side frame in a cantilever state, and which travels to be lifted/lowered; and a drive body for freely vertically lifting/lowering the upper mold mounting member relatively to the lower mold mounting member by traveling of the guide member.

Abstract: Tire recapping or retreading apparatus and method including the use of a tread mold with a plurality of mold segments. A tread mold loading machine is used to position the prepared tire carcass relative to the mold segments and to install the mold segments on the exterior of the tire carcass. The mold segments are retained in place on the exterior of the tire carcass by a tension band. Resilient elastic tension bands or pre-stressed metal tension springs hold the mold segments on the tire carcass after the mold segments have been released from the tread mold loading machine. The use of the tread mold loading machine and the mold segments eliminates distortion of the tire carcass during installation of the tread mold.

Abstract: In order to assure a safe gas discharge from the cavity formed in the tire-vulcanizing mold during the forming of the tire blanks, the profiled segment (1) be divided along at least one separating line (2) into at least two partial segments (3 to 8), that the separating line (2) extends substantially radially in relationship to the tire mold, and that the separating line (2) cuts the areas of the tire-vulcanizing mold to be vented. Manufacture of the segments is done such that the profiled segment (1) is first manufactured in one piece and is thereafter divided into the partial segments by means of a cutting operation, such as a wire cutting spark-erosion cutting operation, leaving behind a narrow cutting line (FIG. 1).

Abstract: A tire recapping and retreading method and apparatus that includes a rigid, segmented tread mold. The mold is retained in place over the tire carcass and uncured tread material by a resilient elastic tension band or prestressed metal tension springs. Further retaining force is provided by a resilient envelope to complete the formation of the retread when the tire and apparatus is placed in a hot air oven. The use of the rigid segmented mold described eliminates the distortion of the tire carcass by the mold.

Abstract: A tire curing press (20) according to the concepts of the present invention includes a pair of spaced mold cavities (MC), base assemblies (22, 23) for supporting lower mold sections (L) in the mold cavities, a cross beam assembly (100) for supporting upper mold sections (U) in the mold cavities, a center post assembly (201) substantially aligned between the centerline of the mold cavities, and a lift mechanism (215) positioned interiorly of the center post assembly for supporting and vertically moving the cross beam assembly to open and close the press. A roller guide assembly (230) is provided for stabilizing and effecting precision vertical movement of the cross beam assembly relative to the center post assembly, while a safety stop mechanism (275) precludes uncontrolled descent of the cross beam assembly from the press open position. A mold locking and clamping assembly (120) locks the mold section (L, U) and applies squeeze forces thereto when the press is closed for curing a tire.

Abstract: An annular metal mold portion forming a tire tread is constructed by assembling a plurality of sector metal molds 2 severed in the circumferential direction, and all or some of the sector metal molds 2 are constructed of a plurality of smaller parts 3 severed in the axial direction as well as in the circumferential direction. Joining surfaces between the sector metal molds themselves each consisting of a plurality of smaller parts are formed of contour surfaces in arbitrary shape of the smaller parts. These contour surfaces are such curved surfaces that at every location a radius of curvature is 5 mm or larger and an inclination angle of a tangential plane with respect to a tire axis is 80 degrees or less.

Abstract: A tire mold including a pair of shells (2) for molding the side walls of tire and a ring or sectors (1) for molding the tread of the tire and in which each sector (1) of the mold includes an outer support (10) and an inner mold fitting (11). The contact of the sectors with each other and of the sectors on each side wall molding shell (2) takes place via segments (3) of small cross section, compressed elastically upon the closing of the mold, so as to assure complete tightness of the mold.

Abstract: A tire-vulcanizing mold including a profiled segment. In order to assure a safe gas discharge from the cavity formed in the tire-vulcanizing mold during the forming of the tire blanks, the invention provides that the profiled segment be divided along at least one interface into at least two partial profiled segments, that the interface extends substantially parallel to a plane of rotation in relationship to the tire mold, and that the interface cuts the areas of the tire-vulcanizing mold to be vented. Manufacture of the segments is done much that the profiled segment is first manufactured in one piece and is thereafter divided into the partial profiled segments by a cutting operation leaving behind a narrow cutting line.

Abstract: In a mold clamping device for clamping a mold to, and unclamping the mold from, a mold mounting member of a tire vulcanizing machine, a locking member has a neck section projectingly installed on the mounting surface of a mold. A guide hole of the mold mounting member, in which the locking member is inserted, has a larger-diameter section in a portion corresponding to the neck section. A chuck member has an expansion section which is slidably inserted in the guide hole, and expands in the larger-diameter section, engaging the neck section in the guide hole. A chuck withdrawing device withdraws the chuck member into the guide hole.

Abstract: In a metallic mold, all or a part of the annular portion for molding at least the tread of the tire is formed by a plurality of small separate pieces that can be combined to form said annular portion. Between these small pieces, during the molding of the tire, clearances are maintained so as to permit the passage of air but not the passage of rubber. The above clearances are connected through vent holes to air suction means. Such vent holes are also connected with means for blowing pressure fluid through the clearances. The construction of this mold portion by means of small pieces made with cuts of the aforementioned portion in the axial and the circumferential direction permits regulation of the width of the clearances with respect to the rheometric characteristics of the elastomeric material to be molded and to adapt easily the mold to different tire sizes by increasing or decreasing the number of such pieces.

Abstract: A curing unit (1) (40) wherein a mold (2) is defined by first and second releasable half molds (3,4) moving in relation to each other along a first axis (6); the first half mold (3) being designed to turn about a second axis (30) perpendicular to the first axis (6) by virtue of actuators (31) which, when the half molds (3,4) are released, can turn the first half mold (3) to and from a maintenance position wherein its concave side faces upwardly.

Abstract: A tire is manufactured by assembling a tread package into a pattern ring and molding a tread thereon while partially precuring the package. The tire is further assembled by positioning an uncured carcass within the pattern ring so that the carcass contacts an uncured portion of the tread package. Finally, the assembled tire is separated from the pattern ring and subsequently heated in a mold devoid of a tread pattern to bond and cure the complete tire.

Abstract: The present invention relates to a tire vulcanizing press which presses to fasten an upper and a lower molds used for vulcanizing a tire by hydraulic cylinders and raises and lowers the upper mold in an up-and-down direction to remove the tire being finished a vulcanizing processing.In the tire vulcanizing press in accordance with the present invention, since the plurality of tie rods hung from the upper mold installation member are respectively connected through the lock device to the cylinder rod of the fastening cylinder and the lower mold installation member to which the fastening cylinder is fixed is pressed to rise toward the upper mold installation member, only the tie rods are positioned around the upper and the lower molds. Therefore, a maintenance of the upper and the lower molds becomes easy, and it also becomes possible to reduce the apparatus size of the tire vulcanizing press as a whole.

Abstract: A tire mold having an upper half, a lower half, and a hinged segmented center ring mounted on the lower half. The center ring has an upper register between the ring and the upper mold half and a lower register between the center ring and the lower mold half to support the center ring during molding. The lower register is provided by engagement of an inclined surface on the center ring with a lower register surface on a ring flange positioned between the hinge axis of each center ring segment and the inclined surface of the segment. The hinge axis is positioned below a lower split plane between the lower mold half and center ring. The height of the ring flange and the inclination of the lower register surface is selected to provide for swinging movement of the center ring segments with the least interference between the center ring and the tire tread during opening of the mold and to provide the maximum support of the center ring segments during molding of a tire.

Abstract: A closing device (9) (52) for axially connecting two half casings (7, 8) of a tire curing mold (1), the closing device (9) (52) featuring a number of calibrated hydraulic cylinders (19), each rigidly connected to a peripheral outer flange (12) on one of the half casings (7, 8), and having a rod (37) extending through a respective opening (41) (54) formed axially through a flange element (18) (53) on the other of the half casings (7, 8); each rod (37) having a head (42) (56) movable in relation to the flange element (18) (53) to and from a position of axial engagement with the flange element (18) (53) itself.

Abstract: A sector-type mold for the molding and vulcanizing of tires, having shells 2) and the sectors (1) which cooperate to withstand the internal molding pressure and remain in closed position without the assistance of additional wedging or holding parts.

Abstract: A vulcanization press for vehicle tires having a bed with at least two molds, each mold having a lower holding mold on the bed and an upper counter-mold. A guide column upstanding from the bed has a handling arm projecting outwardly therefrom which is capable of vertical movement along the column and rotational movement about the column. The handling arm has a series of rotatably operable latches for engaging the upper counter mold cover of one mold and to move it upwardly and arcuately sideways and vertically downwardly to be positioned upon the other mold.

Abstract: Upon the opening of this sector mold 30, the rods 43, which penetrate into recesses 39 which are pierced through plates 37, assure purely radial mold removal by producing a pull on the sectors 30. This arrangement is compatible with a subsequent swinging of the sectors 30.

Abstract: A bladderless tire mold press for tires including lower and upper platens and a mechanism for moving the platens relatively toward one another from an open position to a closed molding position. Each of the platens includes side wall molds for molding the tire sidewalls and thread molds for molding the tire thread. Each of the platens further includes a mechanism for molding tire beads. The tire bead molding mechanism including central mechanisms which are movable relative to their respective platens for insertion into the center of the tire.

Abstract: An apparatus for molding articles, particularly tires, of different diameters/circumferences including a plurality of pitches defining a mold cavity, the pitches having transverse faces in generally face-to-face abutment in a closed position of the mold cavity, and at least several of the pitches being of different lengthwise sizes. The pitches in the closed position of the mold cavity defining a predetermined mold configuration which includes portions at angles to the length of the article molded in the mold cavity. The mold configuration matches lengthwise across all of the transverse faces irrespective of the location of the pitches relative to each other and irrespective of the number of the pitches. The latter arrangement permits articles, such as new or retread tires, of different lengths but of the generally same predetermined mold configuration to be molded in a single mold.

Abstract: The present invention provides a clamp assembly for use in combination with a vulcanization press for curing tires wherein the press includes a frame for supporting upper and lower platens carrying upper and lower cooperating mold halves. The platens are movable toward and away from each other such that the mold halves may be moved toward a closed mating position and an open tire receiving position. The clamp assemblies of the present invention hold the mold halves onto their respective platens and include an elongated clamp body which is mounted to the press frame adjacent to a platen and a sliding wedge member which is guided for movement toward and away from the platen along the clamp body. The mold halves are each provided with a wedge-shaped clamp ring and pneumatic cylinders are provided for moving the sliding wedge member forward to engage the clamp rings and thereby hold the mold halves in place on the platens.

Abstract: A modification to a multiple cavity tire press places a plurality of hydraulic cylinders beneath the lower mold half and heat platen of each mold in the press. The size of the side links of the press is adjusted so that in normal operation, the side links only bring the upper and lower mold halves into close registration and hydraulic pressure applied to the lower mold halves through the plurality of hydraulic cylinders gives the squeeze to the press halves, as well as eliminating or minimizing the malocclusion of the mold halves known in the prior art due to deflection of the respected upper and lower portions of the mold by application of mechanical squeeze.