Abstract: In the molding of boot and shoe heels a foamable plastics molding material is injected into a heel mold and a pressurized gaseous fluid is injected into the heel body after it has formed an outer skin against the mold inner surfaces but before it has fully set in order to displace and compress the foaming material and form within the heel at least one enclosed hollow chamber which provides a different degree of resilience to heel strike forces at the location of the chamber. A plurality of closely adjacent chambers may be provided to obtain the same effect, particularly when the heel is shallow. A preformed member may be placed in the mold to form the heel outer surface and ensure a minimum heel wall thickness at this location. The invention also includes apparatus for making such heels, and the heels when so made. The molded body may comprise a sole with an integral heel part. The enclosed chamber may be vented to the ambient atmosphere or it may be sealed.

Abstract: A flipper device (1) is comprised of a fin forming front part (2) made of a relatively rigid material and device (F) for fixing the fin (2) to the foot (3) of the user. The fin (2), in its rear region (6) is fixed under the sole (4) of a foot piece (5) made of a material which is more flexible than that of the fin; at least the front part (11) of the foot piece is covered by a coating (10) of material which is more rigid than that of the foot piece (5). The coating (10) is integral with the fin (2) and is appropriate to transmit correctly an impulse from the foot (3) to the fin (2).

Abstract: A method of making a mold from a model is disclosed. A mold carrier is formed having an aperture therein. The aperture has a configuration generally corresponding to the shape of the model. The model is positioned within the aperture such that a space is created between the outer peripheral surface of the aperture and the outer peripheral surface of the model. A resilient first material in its liquid state is poured into the space such that the first material substantially covers the outer peripheral surface of the model. The resilient first material is allowed to solidify in the space such that a resilient mold insert is formed. The mold insert forms an impression of the outer peripheral surface of the model and is disposed along the inner peripheral surface of the aperture. The model is removed from the resilient mold insert. A second material in its liquid state is poured into the aperture of the mold carrier with the resilient mold insert disposed along the inner peripheral surface of the aperture.

Abstract: A method of making a mold from a model is disclosed. A mold carrier is formed having an aperture therein. The aperture has a configuration generally corresponding to the shape of the model. The model is positioned within the aperture such that a space is created between the outer peripheral surface of the aperture and the outer peripheral surface of the model. A resilient first material in its liquid state is poured into the space such that the first material substantially covers the outer peripheral surface of the model. The resilient first material is allowed to solidify in the space such that a resilient mold insert is formed. The mold insert forms an impression of the outer peripheral surface of the model and is disposed along the inner peripheral surface of the aperture. The model is removed from the resilient mold insert. A second material in its liquid state is poured into the aperture of the mold carrier with the resilient mold insert disposed along the inner peripheral surface of the aperture.

Abstract: The invention offers the three-color-side-wall rubber soles in easily changeable mode. It only referred to the integrated multicolor rubber soles which can be manufactured by a mould set with the changeability of color ring in various series. The invention may be directly applied to the streamline of soles to form shoe modes. The invention may be simply designed. In the meantime, it exprsses the unique characteristic properties.

Abstract: Process for producing shoe soles of injected plastics material, which soles have an empty chamber visible through a transparent material, which process comprises the following steps:a) injection, into a hollow region comprised between a mobile die and a first removable plate, of a multipart tread sole, with at least one of said sole parts being made from a transparent material;b) injection, into a region comprised between said first removable matrix and a second, removable matrix, of a shaped body comprising a perimetrical wall 13 and a top wall 14;c) removal of said first matrix and injection, into the hollow region comprised between said tread sole and said shaped body, of a layer 17 made of a material suitable for bonding the shoe sole and said shaped body to each other;d) removal of said second matrix and injection, into the hollow region comprised between the vamp, the tread sole and the external side of said shaped body, of a material which constitutes the intersole;e) possible either partial or total f

Abstract: A foot-support element such as an insole or a part of an insole is provided with a checkvalve through which it can be selectively inflated, the top and bottom walls of the insole being bridged by partitions which retain the shape upon pressurization. The insole is formed with upper and lower parts in upper and lower die members working together with an intermediate die member which, upon removal, allows the upper and lower die members to be brought together to fuse the parts of the insole together.

Abstract: A light, comfortable, lined shoe made of soft synthetic resin that employs another more durable hot-melt bond synthetic resin in the critical heel and foot entry opening regions to prevent shape distortion over the long term is provided. An extremely simple method of manufacture allows the shoe to be made inexpensively in quantity.

Abstract: A method of manufacturing footwear and the footwear wherein the footwear is manufactured by providing a mold having a mold cavity, placing a sole member in the bottom of the mold cavity, placing a foamable material over the sole member within the mold cavity, providing a last having shoe upper means thereon, positioning the shoe upper means against the mold cavity to form an enclosed space therein formed by the shoe upper means and the sole member and foaming the foamable material within the enclosed space. The footwear comprises upper means and a sole member secured to the upper means, the sole member comprising a prevulcanized sole portion extending to and engaging the upper means to form a spew-proof cavity therebetween and a foamed material filling the cavity.

Abstract: To automate the roughening of the peripheral surface of a shoe upper in the region to be soled, the application of adhesive along such surface and a final deburring operation, prior to injection molding the last supported shoe upper in the region of lateral side mold elements is measured at the peripheral curvature to determine a curved line of spacial coordinates and angles of curvature starting at a preselected null point, and the values are stored. Another last supported shoe upper is moved by a rotary turntable to be scanned at selected points along its periphery for comparing the selected points to the spacial coordinates and angles of curvature. Any deviation therefrom is adapted to a second preselected null point, after which the shoe upper is guided by a computer controlled robotic device along the curved line starting from the second null point.

Abstract: A process of mixing isocyanate and a polyol that reacts to form polyurethane used for the production of shoe soles includes the feeding of the isocyanate and the polyol into the bore of an elongated cylinder having a discharge opening at one end, the bore having a conical surface tapering toward that end, mixing the isocyanate and the polyol into a mixture reacting into the polyurethane by rotating an externally threaded worm in the bore, the worm having a shape matching the shape of the bore, and conveying the polyurethane through the opening into a shoe sole mold cavity. The worm and the cylinder in which it operates is disposed along a substantially vertical axis relative to the mold cavity, and the discharge opening is directed downwardly toward the mole cavity.

Abstract: Outer and inner soles and a sole welt are molded onto shoe uppers. A molded outer sole is formed by injection molding plasticized thermoplastic material into a first mold cavity defined by a first mold part at an end of a pivotable mold carrier and a confronting mold plate. A molded sole welt closed on itself is formed on a last supported shoe upper by injection molding plasticized thermoplastic material into a sole welt mold cavity defined by an opposed pair of first lateral mold elements closed against the shoe upper while a second mold part at an opposite end of the mold carrier confronts the shoe upper and the lateral mold elements. The mold carrier is shifted away from the lateral mold elements and pivoted to confront the first mold part and the molded outer sole to the shoe upper. An inner sole mold cavity is formed with the molded outer sole by closing an opposed pair of second lateral mold elements located between the first lateral elements and the first mold part.

Abstract: Apparatus and method for injecting molten plastics material into a midsole cavity by the provision of channels entirely within at least one-half of a split side mold defining sides of the cavity. This arrangement eliminates the problems associated with injecting the molten plastics along a channel formed in the parting line between the side mold halves and particularly overcomes the problem of injecting molten plastics material incorporating a blowing agent to provide closed cells in the midsole.

Abstract: An apparatus is provided for molding an article of footwear having an outer sole, a lateral sole and an inner sole, the outer and lateral soles being of an elastomer, and the inner sole being of a thermoplastic or a mixture of isocyanate and a polyol reacting into polyurethane. The outer sole and the inner sole are each injection molded from an elastomer and bonded at their common contact zone by full vulcanization. The outer sole and the lateral sole may each be of different elastomers. The outer sole and the inner sole are bonded together in the area of their contact zone via chemical bonds between the isocyanate and reactive end-groups of substances added to the elastomer.

Abstract: An apparatus for molding an outer sole of elastomer and an inner sole of a mixture of isocyanate and a polyol reacting into polyurethane to shoe uppers includes a vertically movable upper cross block supporting a pivotably mounted mold carrier with a heatable first mold part at one end for the molding of outer soles, and a lower, vertically adjustable cross block has a heatable plate in contact with the first mold part. The mold carrier is pivoted such that the heatable first mold part containing the molded outer sole forms a mold cavity for an inner sole together with laterally movable mold elements and a last supported shoe upper.

Abstract: An apparatus and process for molding an outer sole of elastomer and an inner sole of a mixture of isocyanate and a polyol reacting into polyurethane to shoe uppers includes a vertically movable upper cross block supporting a pivotably mounted mold carrier with a heatable first mold part at one end for the molding of outer soles, and a lower, vertically adjustable cross block has a mold plate confronting the first mold part. The first mold part releases the molded outer sole on to the mold plate, the mold carrier is pivoted such that a cooled second mold part at the opposite end thereof overlies the molded outer sole which is then transferred to the second mold part, the mold carrier is again pivoted to confront the molded outer sole to a shoe last supported shoe upper, and an inner sole mold cavity is formed with the molded outer sole juxtaposed to the last supported shoe upper, and by an opposed pair of lateral mold elements closed about the shoe upper.

Abstract: To prevent the staining of a nitrocellulose coated shoe upper by a polyurethane shoe sole prepared from a mixture comprising a polyisocyanate, a polyol, a chain extender, a tertiary amine catalyst, a surfactant and water, an effective amount of a reactive organic halogen compound, preferably a halogenated fire retardant, is added.

Abstract: The invention relates to a process for producing a three-dimensional stiffening element from a powder selected from the group consisting of a meltable plastic powder and a powder mixture comprising the meltable plastic powder comprising applying the powder to an auxiliary carrier in a template screen printing process with the aid of a template and subsequently transferring the thus obtained stiffening element to a substrate, the improvement comprising subsequent to the step of applying to the auxiliary carrier, compressing and sintering the powder with a hot molding plug to obtain a blank; lifting the plug while removing the blank from the auxiliary carrier and further melting the sintered plastic particles of the blank which are in contact with the molding plug; and said step of transferring comprising transferring the further melted blank onto the substrate disposed therebelow while lowering the molding plug.

Abstract: A sports shoe such as a soccer shoe having an injection molded sole molded to an inner sole, the sole having open spaces and injection molded cleats molded to the inner sole.

Abstract: In a method of manufacturing sheets of highly wear-resistant plastics material, particularly for manufacturing covers subjected to wear, such as, for example, belts, straps, shoe soles or the like, the behavior of the sheets, particularly as far as suppleness, wear-resistance and inexpensiveness in the production are concerned, is to be significantly improved over known sheets of leather or rubber. The blanks manufactured from such sheets are to have the same properties. According to the invention, sheets are manufactured in a high-pressure casting method from a mixture of polyol and a filter portion of up to 30% with the addition of isocyanate, chalk being particularly used as filler.

Abstract: A device for moulding soles composed of a rubber tread and a polyurethane intermediate layer and for directly attaching the soles to shoe shafts includes a bottom work station in which the rubber tread is moulded, a top moulding station in which the polyurethane intermediate layer is moulded between the rubber tread and a shoe shaft, and an intermediate cooling station wherein the rubber tread is cooled prior to being transported to the top moulding station.

Abstract: An air cushion shoe sole which is preferably blow molded of elastomeric material and has at least one cavity which in cross-section is substantially rectilinear. The cavity has a number of depressions and each cavity has an air valve for introducing a shock absorbing material, namely gas, liquid, or a combination thereof into that cavity. Each air valve has means in it for automatically bleeding off a portion of the shock absorbing material introduced into the cavity once the pressure of that material reaches a predetermined level.

Abstract: A method for casting in situ an insole on a foot comprising the steps of preparing a mold defining an open top recess, providing a casting material in the recess, placing the foot inside the recess at a predetermined angle and position relative to the mold, engaging the casting material by the plantar surface of the foot, permitting the casting material to conform to the shape of the plantar surface of the foot, and permitting the casting material to harden.

Abstract: A method of working leather, in which a deposit of material adhering to the leather is made on the surface of the leather to enable a leather footwear upper treated in this way to adhere to a sole without being carded or sanded, either by direct injection of sole-constituting material, or else by bonding on or by gluing on a prefabricated sole, and/or to enable the leather to be worked by a high frequency current.

Abstract: A shock-absorbing innersole for use in footwear, which innersole comprises an innersole body composed of a substantially nondeformable elastomeric-type urethane cellular polymer, having a contoured molded heel and arch section and a substantially flat sheet containing a ball and toe section, the innersole having one or more shock-absorbing inserts in the innersole positioned in the heel, ball or both areas of the innersole, the insert composed of a solid elastomeric polymer which has greater shock-absorbing properties and greater surface tack than the elastomeric urethane of the innersole body.

Abstract: A shoe sole of elastomeric material is formed with at least one pressurized gas cell at least one wall of which is defined by a layer in which a substantially inextensible reinforcement is embedded to prevent bulging. The cell envelope can be formed by rotational casting of a liquid material within a cavity of a wear layer to simultaneously penetrate the reinforcing layer.

Abstract: A shoe of the high-upper type is formed by two slippers of leather or like material and of different size. One slipper is engaged within the other, a metal former is placed within the inner slipper, and the assembly is placed within a mold comprising two halves and a bottom mold block corresponding to the outsole and provided with an injection sprue. The plastic injected through the sprue passes through an injection orifice in the bottom slipper sole, spreads within the internal space between the two slipper soles so as to form the insole, then passes downwards through holes located in uniformly spaced relation in the bottom slipper sole and spreads between the bottom sole and the mold block so as to form the outsole which is thus intimately bonded to the insole. At the same time, the injected plastic flows upwards within the internal space between the two slippers so as to form the upper of the shoe.

Abstract: An article of footwear is made by partially forming the article so as to comprise at least an upper (11) lasted to a first insole (12), arranging the partially formed article to fully expose the upper (or inner) surface of the first insole, preferably by turning the partially formed article inside out, and moulding a shock absorbing or resilient second insole (15) of elastomeric, preferably visco-elastic, material onto the exposed surface of the lasting insole. An outsole (13) is applied to the article at some stage, preferably before the second insole is moulded in.

Abstract: A method of manufacturing a shoe which comprises forming a foamed outsole in a mold cavity and cementing an insole to the formed outsole during molding. The mold is made of a silicone rubber and has a deeper cavity for forming the outsole and a shallow cavity for receiving an insole. An upper with multi-colors is fabricated by cementing differently colored plastic segments and a lining cloth by high frequency sealing.

Abstract: A process and configuration for constructing the lower part of a spikeless type athletic shoe having molded studs on its undersurface to improve its wear-resistance is disclosed wherein portions of the sole and heel are premolded of an extra-durable material, such as high carbon content rubber, and then disposed partly cured in the shoe master mold at selected locations for molding and curing with the remainder of the sole and heel to produce a lower construction of conventional rubber molded with underface portions of extra-durability at the selected areas of greatest wear.

Abstract: A two-layer sole is molded onto the bottom of a lasted upper by molding a first color outer sole with a recess in the top thereof, molding a second color inner sole to fill the recess. The inner sole including a flange which covers the outer sole and extends slightly outwardly from the periphery thereof between the outer sole and the upper, coloring the flange a third color, and removing a portion of the flange so that the resulting sole appears to include an outer layer, a midsole and a separate welt.

Abstract: The manufacture of a sole unit for footwear, such as an athletic shoe including an integral midsole/wedge or a separable wedge for use with a midsole. The integral midsole/wedge unit and the separable wedge comprise a shell and a core at least partially encapsulated within the shell. In the manufacture the core is supported in a mold by a plurality of pins extending from an upper and lower mold half toward a parting line; or the core is supported on one or the other of an outsole or insole of the sole unit and closed in the mold. The material of the shell is poured or injected into the mold.

Abstract: An integral sole and heel construction for footwear having a wear resistent under-heel is formed by molding a fluid pre-polymeric compound using the under-heel as a piston to displace the fluid compound at least in part through channels formed in the under-heel.

Abstract: Apparatus for molding the sole of a shoe and the like to an upper comprises a pair of mold elements adapted to come together laterally and having peripheral edge portions for engaging the upper. Corresponding ends of the peripheral edge portions are configured for defining a gap therebetween where the mold elements join together. An edge portion of a pivoted blade member spans the gap when the mold elements come in contact.

Abstract: The disclosure relates to the manufacture of footwear with direct molded elastomeric soles wherein the last is built up in the center region to provide a sole which appears thick externally, yet is thin and relatively lightweight in its center region. The last includes grooves over the region of the stitches securing the upper to the welt to seal and waterproof the footwear in the region of the stitches by permitting the sole material, when molding takes place, to flow over the stitches.

Abstract: A one-piece, washable and sterilizable plastic shoe comprising a lower part with a top on which the foot bears and a bottom enveloping an outsole and a heel, and an upper part having ventilating openings in a substantially vertical lateral area, these openings having upper and lower outer boundary edges that are lower, respectively, than the corresponding upper and lower inner boundary edges thereof. The method for producing such a plastic shoe includes the steps of introducing mouldable plastic into a mould comprising top and bottom halves with a shoe last therebetween and simultaneously forming the lateral ventilating openings by means of spaced pins extending between the bottom-half mould and the last. The apparatus for producing the shoe comprises a mould having top and bottom halves with a shoe last therebetween and a plurality of pins extending from the bottom-half mould into removeable engagement with the shoe last.

Abstract: The invention relates to a process and tooling for producing a shoe of open top form having for example two parts of an upper (secured together by means of a buckle or other arrangement) are anchored by pegs within one part of a mould defining the bearing surface for the foot against the bottom of the shoe; the other part of the mould being shaped in such a manner as to define the periphery and the base of the shoe bottom the edges of the mould acting in conjunction to define the upper edge of the bottom of the shoe and to form clefts through which each of the two parts of the upper pass, filling of the mould with mouldable material resulting in the upper components being secured in the bottom of the shoe.

Abstract: A ballet dancer's toe dancing ballet shoe is designed and manufactured more simply than conventional ballet toe shoes. A sole supporting shank of the toe shoe has a tip flap at the front thereof which may be folded up to define the front panel of the completed ballet toe shoe. The shank is applied to a male mold member which is inserted into a female mold member cavity and resin is inserted into the space between the mold members for defining a toe box support frame in which the inserted portion of the shank and tip flap are embedded. The shank is comprised of a leather-like material. The completed combination of the shank and toe box support frame are removed from the mold members. A ballet toe shoe upper is fastened to the shank and over the exterior and in the interior, as well, of the toe box support frame.

Abstract: A sport shoe in which the shoe sole is bonded to an insert layer during the formation of the shoe sole by injection-molding and the assembly of the shoe sole and the insert layer is secured to the shoe upper by an adhesive applied between the insert layer and the shoe upper.

Abstract: A method for producing a shoe sole, which comprises forming in a bottom surface of a cavity of an outer mold of the sole forming mold a groove for forming a ridge which is to divide said bottom surface into at least two sections, charging a sole forming materials into said cavity such that respective materials will be supplied into the adjoining two sections, closing the cavity with the press plate of said mold, and then compressing and heating the cavity.

Abstract: Two component polyurethane soles for footwear are molded continuously in an apparatus including a turntable with a plurality of mold stations therearound. While a first sole portion is being molded at one mold station, a second sole portion interconnecting the first sole portion to a lasted upper is molded at the same mold station. Such simultaneous molding is achieved using a mold bottom or top which retains the first sole portion and with such first sole portion forms part of the mold for forming the second sole portion. The second sole portion mold is completed by mold sides and a lasted upper.

Abstract: An injection casting apparatus for the manufacture of multiple layer shoe soles in a multiple element mold (11). The bottom of each mold is closed by one of two bottom stamps (14, 15) disposed on the ends of support arms (23, 24) which are mounted about an inclined axis of rotation (42). The bottom stamp not in use is directed radially outward from the apparatus to improve servicing and cleaning. The bottom stamp in use is centered above a raising and lowering device (37) which moves the stamp into operating position to close the mold and away therefrom to rotate the stamps. This centered arrangement prevents any torque from arising in the bottom stamp during use.

Abstract: The process and mold are specially adapted to produce safety footwear for professional use and in particular for persons working on building sites, these articles being obtained by injection molding. The process comprises previously coating the metal sole with adhesive on both sides and fixing it on the mold slab corresponding to the first injection at a distance from the last so as to form between the mold cavity of the slab and the last a gap corresponding to the thickness of the insole produced by the first injection. Thereafter, the slab is removed and there is brought in front of the visible face of the metal sole the second slab for injecting the outsole which will cover the face of the metal sole.

Abstract: A shoe and its method of manufacture in which an upper and preformed rubber outsole are joined by a foamed polyurethane, injection-molded midsole. The rubber outsole and polyurethane foam midsole combine to provide a lightweight and flexible shoe compressively conformable to the flexing foot and having strong traction and long wear.

Abstract: A sole-heel assembly for women shoes, particularly of the high heel type, made of a plastics material, is described, which is formed of a single piece and is provided, inwardly with respect to the heel, with a reinforcing core having a hole for the fixing of the heel top-piece. A stiffening element is embedded in the sole and extends from the top of the heel as far as the overall front part of the foot-sole. The heel is laterally and rearwardly covered by a thin sheet material. The heel is covered on the front face by a further thin sheet material. The thin sheet material consists of skin, synthetic skin, wood or plastics laminate, and the reinforcing core and stiffening element are made of wood, metal, premolded plastics material or the like.

Abstract: In a slush molding process for producing a boot or shoe from a plastisol, a mold in the shape of the article of footwear is filled with liquid plastisol, the mold is heated to form a skin, the mold is tilted to pour out excess plastisol, and, after filling the heel cavity of the mold, the skin and heel filler are cured or hardened, and the skin is removed from the mold and trimmed for further processing. Instead of filling the heel cavities of the molds with a specially formulated heel filling composition, the skin trimmings, which were previously discarded as waste, can be ground, if necessary, mixed with additional stabilizer and injected into the heel cavities using an injection unit. With the molds travelling along a straight line path of travel, it is necessary to cause the nozzle end of the injection unit to move in synchronism with the molds.

Abstract: A mold for forming an article having a complex shape such as a unitary sole and heel tread member for a shoe and method of making same wherein the article to be cast is formed from a material which is injected into the mold in a hot fluid form. The mold for such an article comprises an upper and a lower mold member, which together define a complete shoe sole mold cavity. Each upper or lower mold member may consist of several intermating sections. The lower mold however, comprises a cavity having sufficient depth around its periphery to permit insertion of an inverted decorative welt plus a second decorative piece placed against the wall of the cavity. The upper mold has a cavity which basically defines the tread of the sole, and the two molds interface to provide a tight seal during the shoe sole molding operation.

Abstract: Method of making casual footwear including a knitted fabric upper, a woven insole portion, and an injection-molded sole is produced in a mold cycle of 45-second duration, as opposed to five or six minutes heretofore generally required, or the +2 minutes with the latest known materials. Molding conditions and materials are carefully controlled, and substantial penetration of the woven and knitted fabrics by the injected material is achieved. The woven insole portion prevents the flowing plastic from pushing the upper over the last. Ethylene/ethyl acrylate copolymer, polyvinyl chloride and styrene butadiene are preferred sole thermoplastics.

Abstract: A plastic heel is attached by inserting through an insole of a shoe a fastener, and vibrating the fastener at ultrasonic frequency to cause its shank to melt the plastic and become embedded in the heel. The fastener may be a staple with wide legs having holes therein. The shank of the shoe may be bridged by the staple for added attachment strength. Since less work penetration is needed than in nail-attaching of heels, advantage is gained especially in securing sharply tapering or so-called "stiletto" heels.

Abstract: A method for the formation of inserts in the edge of footwear or shoe soles made by means of injected plastic material, in which either the edge of the sole or the whole sole of the footwear is first moulded by injection, and successively at least a lateral recess is obtained in said edge of the sole itself, and thereafter a differently colored plastic material is injected into said recess for forming a lateral insert in the previously moulded edge of the footwear sole.