Abstract: A device for the moulding and vulcanization, in predetermined conditions of temperature and pressure, of an at least partially green tyre having a defined volume, said device comprising an outer shell and a collapsible inner support, in which said device also comprises a movable crown interposed between said inner support and said outer shell, said movable crown forming, with said outer shell, a cavity of controlled volume for the moulding and vulcanization of said tyre, the volume of said cavity adapting to the volume of the tyre it contains, so that said moulding pressure is maintained within a predetermined range of values. The invention also relates to a method of moulding and vulcanization at controlled volume.

Abstract: A tire mold having improved heat transfer is disclosed. A plurality of wear plates are installed onto a conical inner surface of an actuating ring. The wear plates are designed to improve thermal transfer between the actuating ring and a segmented treadmolding ring, reducing tire cure time and temperature variation within the mold.

Abstract: A rubber track T has a plurality of guide lugs 50 arranged in two rows, one row being on each lateral edge. The guide lugs 50 of the first row are circumferentially offset from the guide lugs 50 of the second row. The track T is molded on an axially separating mold core D that is designed to form the radially inner guide lugs 50 without requiring a radially collapsible core.

Abstract: A process of depositing at least one uncured colored rubber mix forming a contrasting motif on an outer surface of a tire includes preparing a blank of the uncured tire to be moulded, including all the constituents except for the colored rubber mix(es), depositing the colored rubber(s) in at least one cavity formed on a removable insert, each cavity having the general form of the motif to be moulded and having a total volume V2, the total volume of non-vulcanized colored rubber V1 placed in each cavity being less than the volume V0, mounting the insert in a suitable housing provided on the moulding surface of the mould for the tire, engaging the tire blank within the mould, and moulding and vulcanizing the tire.

Abstract: The present invention comprises a mold having a wall with a recess defined therein and magnetic means, wherein an associated insert is adapted to be selectively held within the recess via the magnetic means, such that the insert is substantially flush with the wall. Using the magnetic inserts in both the upper and lower mold halves results in a tire identification number being imprinted on both sides of a tire during a curing cycle. The inserts are easily and quickly changed so that down time during production is minimized, tire appearance is improved, and eliminates tire scrap.

Abstract: A segmented tire mold for molding a pneumatic tire with reduced flash in the sidewalls. The mold has an annular array of tread mold segments which have an inner circumferential surface and inwardly extending projections which form the tread pattern in the tire including the skid surface and tread lugs. The mold further includes a pair of sidewall mold plates which are in abutting contact with the tread mold segments and form a pair of circumferentially extending mold parting lines which are in axial alignment with a nylon reinforcing strip located in the crown portion of the tire and within ½ inch of the inner circumferential surface of the tread mold segments to reduce flash formed on the molded tire.

Abstract: The invention relates to a device for treading a vulcanized tire carcass using an uncured tread comprising a rim (6) for mounting the carcass, an elastic annular mold (7) whose circumferential outer surface is covered with an elastic sleeve (16), the mold being intended to mold the uncured tread (3), the device comprising two disc-shaped elastic flanges (8, 9) intended to cover, respectively, one sidewall of the assembly composed of the constituted tire covered with the mold (7), the larger-diameter peripheral end (82, 92) of each flange (8, 9) bearing a rigid annular member (33) for connection with the sleeve (16) covering the mold (7).

Abstract: A dismountable toroidal support for tyre manufacture includes a plurality of sectors, a flange, a counter-flange, and engagement devices. The sectors are aligned around a reference axis to define an outer surface reproducing an inner conformation of a tyre. The flange carries at least one attachment member for engagement with a handling device. The counter-flange can be operatively linked with the flange. The engagement devices can fixedly hold the sectors between the flange and the counter-flange. Each of the sectors has a main body with a substantially U-shaped outline which is delimited between an outer side defining an outer surface and an inner side facing the reference axis. The engagement devices include at least one attachment plate radially projecting from a respective inner side substantially in a plane normal to the reference axis and adapted to be removably engaged at a position axially interposed between the flange and the counter-flange.

Abstract: A mold which is for a pneumatic tire comprising a pair of bead portions, a pair of sidewall portions and a tread portion provided with a tread pattern formed by repeating a pattern unit around the tire at plural kinds of pitches in a sequence, is disclosed. The mold comprises a sidewall molding surface for one of the sidewall portions, and a tread molding surface provided with the negative tread pattern formed by repeating the negative pattern unit at the above-mentioned plural kinds of pitches in order to mold the tread pattern. The sidewall molding surface comprises sector regions defined as extending radially inwardly from the pattern units, respectively, wherein the largest sector regions defined as extending from the pattern units with the largest pitch swells towards a cavity of the mold when compared with the smallest sector regions defined as extending from the pattern units with the smallest pitch. The mount of the swelling is such that the larger the pitch, the larger the amount of swelling.

Abstract: A low-section tire includes an air tube including an internal wall and two air tube sidewalls. The internal wall comprises a greater rigidity than the tube sidewalls so that, when a carcass and the tube are mounted on a rim, and during inflation, the tube sidewalls contact the carcass sidewalls no later than the internal wall contacts a crown portion of the carcass. A process for manufacturing the air tube includes moulding two tube sidewalls separated from each other, moulding a central core, arranging the tube sidewalls and central core in a single vulcanization mould, closing the vulcanization mould to form the tube, feeding pressurized fluid into at least two distinct circumferential portions of the tube, and vulcanizing the tube to join the central core and tube sidewalls. A mould for manufacturing the an air tube includes two axially-external cheeks, two axially-intermediate male dies, and two axially-inner spacers.

Abstract: A lamella for use in a vehicle tire vulcanization mold has projections and depression, wherein the height of the projections and the depth of the depressions extend substantially parallel to a peripheral surface of the tire tread of the vehicle tire to be molded in the vulcanization mold. Each one of the projections has a highest point-shaped location or top. Each one of the depressions has a lowest point-shaped location or crater. The projections and depressions are distributed according to a substantially uniform areal division. The areal division is defined by dividing lines extending in a dividing plane preferably centrally positioned between a first plane defined by the tops and a second plane defined by the craters. The dividing lines are comprised of three sets wherein the dividing lines within each one of the sets extend parallel to one another and wherein the dividing lines of different ones of the sets intercept one another at an angle of substantially 60° so that a grid of triangles is formed.

Abstract: A bladder for a vulcanizer includes, as a constituent member, a low elongation material with stable properties at vulcanization temperatures. During a vulcanization-molding process, the bladder is pressed against the inner surface of a green tire using a pressurized medium. The pressurized medium can be at vulcanization temperatures. The bladder has substantially the same shape as the inner wall surface of the tire that is formed using the bladder. As a result, irregularities in the shape of the inner wall surface of a tire rarely occur, and the frequency of exchange of bladders can be reduced. The vulcanizer bladder can include a conductive material or a magnetic material, both of which can be heated by using an induction heating coil. The use of both heat from the pressurized medium and heat generated in the bladder to vulcanize a green tire can shorten the period of time required for vulcanizing-molding.

Abstract: A method and apparatus for curing large radial pneumatic tires using a plurality of like molds each having top and bottom mold sections provided with radially movable groove-defining tread segments which are automatically extended into a tire to be cured when the molds are positioned within an autoclave and which are automatically retracted when the molds are withdrawn from the autoclave to free the cured tire from its respective mold.

Abstract: A tire mold comprises a molding face for shaping the outside of a tire and a vent structure, wherein the vent structure comprises a hole having an opening in the molding face, an inserted piece disposed in the hole so that the surface of the inserted piece defines a part of a molding face, and a micro-gap of not more than 100 micrometers formed between the inserted piece and the hole for the purpose of vent.

Abstract: A tire mold 2 for curing new or retreaded tires 20 has an upper platen 4, a lower platen 6, and a central rim 30 with a frangible member 50 designed to open when a predetermined pressure P1 in excess of the normal curing pressure Pc is observed. The frangible member 50 preferably includes a rupture disk 60 that breaks upon exposure to the pressure P1.

Abstract: A tread for a tire having, on at least one lateral part, and radially to the inside of the running surface of said tread, a plurality of cavities oriented virtually transversely and opening onto at least one of the edges of the tread, the cavities being intended to form grooves and incisions opening radially towards the outside of the tread after wear of between 15% and 45% of the thickness of the tread when new. Also, a mold adapted for the molding of such a tread pattern and including, on at least one part molding one of the sidewalls, elements in relief for molding cavities radially beneath the running surface of a tread when new.

Abstract: A mold for molding a tire comprising at least two sub-molds; said at least two sub-molds being capable of forming a predetermined form as a whole when used for molding a tire, characterized in that each of said at least two sub-molds has a venthole for discharging air from the blockades formed between the surface of the green tire and that of the sub-mold when a green tire is pressed on the surface of the sub-mold, and a ventlid being made of a flexible member and having a lid mechanism capable of discharging air from blockades, but capable of preventing the green tire flowing out therefrom.

Abstract: A method of molding and curing tires for vehicle wheels includes the steps of disposing a tire being processed on a toroidal support, enclosing the tire and the toroidal support inside a molding cavity defined in a vulcanization mold, pressing the outer surface of the tire against the molding cavity walls, and administering heat to the tire to cause molecular crosslinking of the tire. The pressing step includes the steps of compressing side portions of the tire between the molding cavity walls and the outer surface of the toroidal support, concurrently with the closing step, and imposing an expansion to a radially-outer portion of the tire to bring the radially-outer portion of the tire against the walls of the molding cavity.

Abstract: A semi-pneumatic tire assembly including a tire casing 22 and a lining 26 is provided. The lining 26 includes a contoured inward surface 30 defining an inflation chamber 18 about an associated wheel rim. The lining 26 minimizes the risk of puncture damage from an object penetrating the tire casing 22 while allowing pneumatic cushioning of the ride and cooler running temperatures as compared to solid-fill tires. Additionally, the semi-pneumatic tire will carry the same load or more than the same tire filled with permafoam and/or solid urethane foam wingfil. The tire assembly is formed by injecting a curable, lining-forming material 96 into a cavity 57 defined between the tire casing 22 and a molding member 50. The molding member 50 includes a contoured outer surface 54 which molds the inward surface of the lining 26. The molding member 50 may be an inflatable airbag 100 retained in the tire assembly during service.

Abstract: A mold 20 for curing a precured tread 10 to a tire casing 100 is disclosed. The mold 20 has a first annular portion 24, a second annular portion 44, a pair of annular portions 12,14, and an inflatable bladder 23 for insertion into the casing 100 when enclosed in the cavity 53 of the closed mold 20. The first annular portion 24 has a sidewall supporting member 27, the sidewall supporting member 27 having a bead forming end 29, and a tread supporting member 28 integrally attached and generally normal to the sidewall support member 27. The tread supporting member 28 has a smooth axially contoured annular surface for contacting the radially outer surface of the precured tread 10 and a first end 50 in proximity to the tread lateral end 48 of the second annular portion 44. The second annular portion 44 has a sidewall supporting member 47 and tread lateral end supporting member 48 the second portion 44 having a first end 50 and a second end 52.

Abstract: A pneumatic tire comprises a tread with a plurality of sipes, in which one of opposed wall faces of the sipe is a concave face arc-shapedly curved over a whole of the sipe in a depth direction thereof and the other wall face thereof is a convex face just fitted to the above concave face, and a curvature of each of the concave and convex faces is substantially constant over a full length in a longitudinal direction of the sipe.

Abstract: A textile fabric which has been coated with an elastomer-forming silicone-based composition, comprising an organopolysiloxane polymer having a siloxane backbone being end-blocked with at least two silicon-bonded reactive groups, preferably alkenyl, a cross-linking organosilicon material having at least 3 silicon-bonded reactive groups, preferably SiH, a catalyst, a first reinforcing filler, preferably silica or a silicone resin, and at least 2 parts by weight for every part of the first filler, of a second substantially laminar filler, preferably talc, pyrophillite, vermiculite, smectite or mica. The coated fabric may have among other benefits, a lower friction value and limiting oxygen index. Fabrics are specifically useful for inflatable safety restraints.

Abstract: This invention relates to novel airbag coating compositions comprising at least two separate and distinct layers. The first layer (base coat), being in contact with the airbag surface. comprises a composition of at least one coating material which may comprise up to 30% by parts of the total amount of material in the first layer of a silicone resin which provides excellent adhesion, excellent tensile strength, and overall lower cost than standard silicone airbag coating materials. The second layer, being a coating for the first layer, provides excellent reinforcement and aging characteristics to prevent degradation of the first layer. Such a second layer (topcoat) is preferably a silicone material. This two-layer system permits excellent strength and aging properties to prevent seam combing at relatively low cost due to the inexpensive basecoat materials and the relatively low amount required for the topcoat.

Abstract: This invention relates to novel airbag coating compositions comprising at least two separate and distinct layers. The first layer (base coat), being in contact with the airbag surface, comprises a non-silicone composition of at least one coating material, provides excellent adhesion, excellent tensile strength, and lower cost than standard silicone materials. The second layer, being a coating for the first layer, provides excellent reinforcement and aging characteristics to prevent degradation of the first layer. Such a second layer (topcoat) is preferably a silicone material. This two-layer system permits excellent strength and aging properties to prevent seam combing at relatively low cost due to the inexpensive basecoat materials and the relatively low amount required for the topcoat. An airbag fabric coated with this inventive two-layer system is also contemplated within this invention.

Abstract: This invention relates to novel airbag coating compositions comprising a mix of polyurethane and polyacrylate constituents which provides a highly effective low permeability treatment on a target fabric surface. This inventive composition also provides a low-cost alternative to other standard airbag coatings and exhibits excellent aging stability as well. An airbag fabric coated with this inventive composition is also contemplated within this invention.

Abstract: A vulcanization mold for manufacturing pneumatic vehicle tires has mold segments for forming the tread strip of a pneumatic vehicle tire. The mold segments have a radially inwardly facing honeycomb lamella pattern in a radial direction of the vulcanization mold. The honeycomb lamella pattern has first zigzag lamella members mounted in the mold segments and second zigzag lamella members mounted in the mold segments. The first zigzag lamella members extend in a first main direction and the second zigzag members extend in a second main direction. The first and second main directions cross one another. The first zigzag lamella members have first lamella elements and the second zigzag lamella members have second lamella elements, wherein the first and second lamella elements form honeycomb walls of the honeycomb pattern.

Abstract: Vehicle tire and a metal sheet mold plate for forming the vehicle tire having at least one axial end section includes a tread that includes sipes running substantially axially in at least one of the axial end sections when viewed from the top (i.e., perpendicular to the tread surface). The sipes are corrugated to form corrugated ridges and valleys that are substantially straight lines diagonally inclined in an oblique plane parallel to the substantially axially running sipes. The substantially axially running sipes may include a first set of sipes and a second set of sipes. The corrugated ridges and valleys of the first set of sipes are oriented, with regard to a radially outward direction, to extend axially inwardly toward (i.e., toward a axial center of the tire). Conversely, the corrugated ridges and valleys of the second set of sipes are oriented, with regard to the radially outward direction, to extend axially outwardly (i.e., away from the axial center of the 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 pneumatic tire comprises sipes in each land portion defined by wide-width grooves in a tread portion, in which a sipe corresponding to at least a part of these sipes comprises a pair of main portions slightly shifting to each other in the axial direction and a link portion connecting opposed end portions of these main portions to each other, and the pair of the main portions are inclined in opposite directions with respect to a radial direction so as to make a mutual distance L between the main portions large.

Abstract: An improved mold (1) for the molding and vulcanizing of annular treads inded, in particular, for the recapping of tires, which includes at least one rigid core (3) defining the inner surface of the tread and a collar (2) divided into sectors (21) which are movable radially between an open position and a closed position of the collar (2) for the molding of the outside of the tread, characterized by the fact that the core (3) bears movable annular elements (5) for the tight connection of the core (3) to the sectors (21) whatever the position of the latter between the closed position of the collar (2) and a slightly apart position of the sectors (21), and that the sectors (21), the core (3), and the annular element (5) define the molding space of the tread.

Abstract: A pneumatic tire the aspect ratio of which is not more than 50% has, for reinforcing a tread portion, a belt comprising at least two rubber coated cord layers having cords arranged obliquely at angles with respect to an equatorial plane of the tire of 26.degree. or more, and a belt reinforcing layer arranged outside the belt and comprising at least one organic fiber cord layer having cords arranged substantially parallel with respect to the equatorial plane of the tire. The tire is molded in a mold with a cross-sectional profile of a molded surface facing the tread portion having a radius smaller than that of a nominal tire cross-sectional profile by 1% or more of a section width of the tire and forming a convex curve to a cavity.

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: 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: A die changer truck for use with a tire vulcanizer, including a self-propelled chassis adapted to halt in front of the tire vulcanizer, a swiveling table rotatably mounted on the self-propelled chassis, two mounting sections for respectively mounting two die assemblies, and two carrier units for respectively carrying two bladder assemblies. The two mounting sections and the two carrier units are provided as two sets on the swiveling table. The two sets are selectively positioned by rotation of the swiveling table. Accordingly, the carriage and change of not only the die assemblies but also the bladder assemblies with respect to the tire vulcanizer can be automated.

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 pneumatic tire having improved high-speed running performances is manufactured by conducting vulcanization of a green tire with a mold provided at a position corresponding to a given position between neighborhood of shoulder portion and neighborhood of bead portion with at least one protrusion which protrudes inside the mold and continuously extends in the circumferential direction of the mold and consists of a first arc segment having a center of curvature located outside from the inner surface of the mold and second arc segments each having a center of curvature located inside from the inner surface of the mold and smoothly connecting to the first arc segment at upper and lower ends in the radial direction of the mold.

Abstract: A method for vulcanizing a tire wherein firstly heating medium is blown toward a tire internal surface from a supply opening arranged at a position above an equator of the tire in a mold and secondary pressurizing medium is blown toward the tire internal surface from the supply opening, and an apparatus used therefor. By virtue of the method and the apparatus, in vulcanization, abnormal cooling at a lower bead of a tire is prevented and consequently a large temperature difference inside the tire is prevented, so that uniform vulcanization can be carried out to provide products having high quality. Further, prevention of the temperature difference makes it possible to shorten a time period required for vulcanization, to improve productivity, and to reduce energy loss.

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: A method and device for manufacturing tire forming bladders (2), whereby a curing mold (3) defines, via first and second half molds (4, 5) and an inner core (6), an inner molding chamber (7) inside which a precured reinforcing ply (72) is optionally inserted; the mold (3) having an outer injection chamber (34) communicating with the inner chamber (7) and consisting of a variable-volume chamber of an injection cylinder (65); the outer chamber (34) being provided with a mass (35) of heated uncured rubber, which is injected into the inner chamber (7) with the mold (3) closed and, when cured, is extracted from the mold (3) by opening the inner chamber (7) and extracting the inner core (6).

Abstract: A method and device (1) for stitching multilayer products (2) of green elastomeric material, whereby an annular multilayer product (2) of green elastomeric material, particularly a product forming at least components of a tire (2), is placed inside a hollow annular body designed to house the multilayer product (2) and forming a stitching mold (5) having a concave inner surface (5a) contacting a first convex surface (34a) of the multilayer product (2) and negatively reproducing the final shape to be imparted on the multilayer product (2); a stitching device (24) being brought into contact, at a given pressure, with a second concave surface (34) of the multilayer product (2); and relative motion being produced between the stitching device (24) and the multilayer product (2), so as to cause the stitching device (24) to stitch the multilayer product (2) in contact with the inner surface (5a) of the stitching mold (5).

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: According to a central mechanism of a tire vulcanizer of the present invention, in a central mechanism of a tire vulcanizer in which a lower clamp ring holding a lower end portion of a bladder is fixed detachably to a lower ring having a passage of a vulcanizing medium, key-shaped holes are bored on the lower clamp ring, springs which press clamp rods which penetrate through the lower ring downward and a fluid pressure cylinder which pushes up the clamp rods against the spring force are provided, and the clamp rods are pushed up so as to release fixing of the lower clamp ring, and the lower clamp ring is removed by rotating the lower clamp ring by a predetermined angle from a state in which the lower clamp ring and the lower ring are fixed to each other by having nuts fixed at the upper ends of the clamp rods engaged with the key holes. Accordingly, the replacement operation of the bladder is automated, thus making it possible to improve the operation rate.

Abstract: An ejector in a tire vulcanizing machine for ejecting the condensate of vulcanizing steam accumulated within a bladder to the outside of a tire includes a drain extraction pipe elevatably and rotatably supported in the machine and extending through a lower ring and a guide ring for clamping a lower edge portion of the bladder, a drain suction pipe extending horizontally from the top end portion of the drain extraction pipe and having its tip end portion bent downwards, an elevation drive and a rotary drive for the drain extraction pipe, and a rotary limit adjusting mechanism provided in the rotary drive. Preferably, the rotary drive is made up of a rotary shaft of a rotary cylinder mounted to the bottom end portion of the drain extraction pipe so as to be supported in an axially movable manner and a body of the rotary cylinder surrounding the rotary shaft.

Abstract: An apparatus for producing prevulcanized tread particularly useful for the recapping of tires having, in stress-free condition, a constant curvature in its longitudinal direction whose radius corresponds substantially to that of the tires to be recapped, the sole of the tread being concave, is characterized by the fact that the tread has two ends in its longitudinal direction. The apparatus includes quasicylindrical inner and outer molds which travel in a curved path corresponding to the radius of curvature to be imparted to the curved tread.

Abstract: A method of making annular polymeric articles in which a workpiece is placed on a cylindrical shaping surface and is divided about the perimeter into alternating first and second portions. Moulding is done in two stages, the first stage including moulding the first portions, and the second stage including moulding the second portions interposed between the first portions at the same time maintaining the pressure exerted on the first portion, after which the workpiece is vulcanized. The mould includes a cylindrical core (1) having a shaped surface, mounted on a base and serving to accommodate the workpiece thereon, and elements (5, 6) for squeezing the workpiece arranged around the cylindrical core (1) alternately, the first elements (5) having each side surfaces (7) parallel with the axis of symmetry of this element (5), whereas the second elements (6) having each side surfaces (7) of the neighboring first elements (5) arranged at an angle (.alpha.

Abstract: The invention relates to form carrier and actuating construction for the vulcanizing machine of rubber tires for motor vehicles, wherein the vertically moveable upper part contains a catch-ring connected to the dome of the vulcanizing machine, an upper plate fitting thereto, a locking ring, furtheron form-segments defining the daylight and upper form-half, while the fixed bottom part includes the base plate and the lower form-half fixed thereto. The construction according to the invention can be characterized in that the form-segments (16) are fixed exchangeably to the gliding segments (4) which can be guided ascew in the guide rails having been formed on the inner conical or pyramidal surface of the locking ring (3) and the gliding segments (4) are connected to the upper plate (1) with the insertion of horizontal guide elements and on the locking ring (3) there is a correction (11) provided with set-screws (10) and fixing screws gap between the catch ring (5) and the upper plate (1).

Abstract: Apparatus for the pressure-forming and curing of polymer products incorporates two moulds (1) and a forming device, the moulds (1) being sturdily linked to each other with provision for setting the separating distance as required and for revolving on a fulcrum pin (9) so that the material of a circular product can be wound therearound. The moulds (1) are semicylinders which face each other with their flat sides and are sturdily interlinked by two parallel plates (2) so as to form integrally therewith a sturdy building core having a contoured outside surface. The forming device is a girdling structure which embraces the semicylinders (1) and the plates (2) circumferentially and is made up of at least two elements at least one whereof is located with provision for radial displacement in the course of pressure-forming.

Abstract: In a tire vulcanizing machine--comprising an element for moving the tire and a mold with several segments carrying mold sections that can move radially--the top section of the mold is held by said element, which can move axially and angularly to occupy one position in which it can collect the untreated tire, one position in which it places the tire into the mold and one position in which it unloads the vulcanized tire onto devices which collect and remove it; element comprises devices which engage the upper rim of said tire on the top section of the mold in the collection position; devices for centering said rim with respect to the top section of the mold are also provided.

Abstract: A venting unit is inserted in a press fit within the air vent of a rubber article forming mold and is comprised of a cylindrical body member with an axial bore having a reduced outer end section forming an air inlet open to the mold cavity. Received for reciprocal axial movement within the bore between an inlet closed position in abutting engagement with the outer end section and an inlet open position removed from the outer end section is a heat absorbing piston or disc. The opposite or inner end section of the bore receives a vented plug in a press fit to form a radially inwardly projected shoulder and a spring is held in compression between the disc and the shoulder of the vented plug. During expansion of the rubber article, pressurized air in the mold cavity urges the disc to its inlet open position and is vented to the atmosphere.

Abstract: A coil section for being excited by a primary ac signal and producing a secondary output signal is provided on the open end side of a bag-cylinder main body. A material consisting of such substance and having such configuration that bring about reluctance change of a magnetic circuit passing through the coil section in accordance with displacement of a piston rod of the bag-cylinder is provided in a predetermined pattern about the piston rod. In a detection circuit, position detection data representing the position of the piston rod is obtained in response to the secondary output signal from the coil section. In a position establishing circuit, stop position data representing a desired position at which the piston rod should be stopped is established depending upon the diameter of a tire to be vulcanized.