Abstract: A method of forming a friction pad utilizing two distinct compounds. One of the compounds has a high fiber content and the other has a high flow characteristic. The compounds are placed in respective layers in a mold and are compressed to form a composite piece which is placed in a second mold cavity along with a perforated metal plate. Heat and pressure are then applied to the composite piece in the second mold cavity to cause the high flow characteristic compound to flow and enclose the metal plate such that the two compounds and the metal plate are firmly bonded into an integral friction pad.

Abstract: A plated through-hole conductor structure for a multiple layer laminate electronic printed wiring board includes mechanical locking of the plated through conductor with textured conductor surfaces together with use of etching or other processing to provide laminate internal space for the mechanical locking structure. A manufacturing sequence and plural material selections are also disclosed.

Abstract: Method for the rational and cheap manufacture of a high-strength, high-precision hub for a spoke-wheel, mainly for the use in a wheel chair, the hub being given, by means of injection molding of a plastic material, a central part (1) having at each of its ends a flange (2) to co-operate the spokes and a seat (5) for receiving ball-bearings. The method is characterized by forming, during the injection molding, openings (4) for receiving the spokes as depressions not extending through the flanges (2) of the hub, and subsequently, after completing the injection molding, producing the openings. Further, the hub is molded as two separate parts (6, 7) having one flange (2) each, the parts being connected to each other after the injection molding. The final length in its axial direction is adjusted by placing an insert (18) into the connection area between the two parts.

Abstract: With the fabrication method and apparatus for the performance of such method, a blank containing hollow spaces extending between its lower side and its upper side is arranged in a mold closed at least at five sides and expanded. The blank is arranged in a mold box, whose area in plan view is larger than the plan view area of the blank. The space between the blank and the mold box wall and possibly hollow spaces which are retained in the blank are filled with a granular filler material, for instance sand, which is trickleable at least during the mold release of the expanded blank. In this way there is ensured for a simple and positive mold release and a protection of the mold box. The molded body can have different constructions and serve the most different purposes. The molded body is preferably constructed as a lightweight structural element for construction purposes.

Abstract: The specification discloses an air-to-air, polymeric heat exchanger having a housing and a core removably mounted within the housing. The housing includes four generally identical duct units, which are secured to one another, and a top and a bottom, which are secured to the duct units. The core includes a pair of end walls and a plurality of tubes extending between, and opening through, the end walls. Each end wall includes a plurality of tubular projections or pockets extending from the end wall in a common direction. Opposite ends of the tubes are secured within the tubular pockets in the opposite end walls. A method of constructing the core includes the step of severing the tubular projections after the tube are positioned therein to expose the tube interiors through the end walls. Preferably, the tubular projections are severed using a hot wire to also fuse the tubes within the end walls.

Abstract: A method of manufacturing a bobbin in which a plastic flange is first insert molded to one end of a winding shaft of nonferrous metal alloy. A bushing of synthetic resin is the forced into a bore in the winding shaft at the other end thereof, and a core having a head is inserted into a bore in the bushing to close an open end of the bore in the bushing with the head of the core. The end of the winding shaft, an outer end of the bushing, and the head of the core are placed in a mold, and a synthetic resin material is injected through a sprue, a runner, and a gate in the mold into a cavity therein to mold a second flange on the end of the winding shaft therearound to obtain a bobbin having plastic flanges at both ends.

Abstract: An improved shielding assembly for an overmolded electrical connector is formed by a pair of mating metal shell members which engage a peripheral metal housing of a standard connector and enclose the rear conductor exiting portion thereof. The shell members each include embossed strengthening means as well as interengaging side walls to completely enclose the rear of an electrical connector. The shell members are each further provided with overmolding pressure release means which opens at a predetermined pressure and allows a limited amount of overmolding material to enter the shell members while equalizing the inner and outer shell member pressures. The shell members also include gripping apertures which allow overmolding material to enter and harden thereby becoming fixedly attached to the shell members to prevent withdrawal due to shrinking as the overmold material cools.

Abstract: The invention comprises a method and various apparatus related to fabricating solid particulate filter bodies and other honeycomb structures the cells of which are selectively charged with a plugging or other flowable material. Solid coverings are applied over the end faces of a honeycomb structure, preferably an adhesive backed transparent thermoplastic film such as polyester, openings are created through the covering, preferably by melting the thermoplastic film, and the sealing or other flowable material is charged through the openings formed in the covering into the underlying cells.A porous walled honeycomb structure having coverings adhered to its end faces with selective openings therethrough is itself a solid particulate filter of some usage. A more substantial solid particulate filter body may be formed by charging a more durable sealant through the openings to form plugs and removing the coverings.

Abstract: A method for providing insulated holes in a conductive substrate by first punching oversized holes in the substrate, then filling the holes with an insulator and then forming an aperture of a desired diameter, less than the diameter of the hole originally punched in the substrate, through the insulator to leave an annular sleeve of insulative material within each hole.

Abstract: An insulated conductor such as an encapsulated electrical circuit is made by locating the circuit components in a preformed carrier with opposed flexible walls with an external, outwardly facing abutment in the shape of a conical opening through each wall. The internal volume between the walls of the carrier is then filled with a hot fluid insulating plastic which also fills the conical opening forming a bridge between the openings. The bridge is caused to cool and set first so that it contracts developing a lengthwise tension which draws the walls toward each other providing the formation of air space between the walls and remainder of the filling.

Abstract: The invention is a method of forming a composite structure which begins with the formation of a syntactic foam core having internal communication passages that terminate with a plurality of openings in the outer surface of said core. After being wrapped with a plurality of layers of porous material, the wrapped core is positioned in a cavity of a mold having an inlet communicating with one of the openings. A source of uncured resin mix then is connected to the inlet and the mold is evacuated. After being forced through the inlet and the passages to fill the mold and impregnate said fibrous material, the resin mix is cured to provide with the core and the fibrous material a rigid composite structure.

Abstract: The invention comprises a method and various apparatus related to fabricating solid particulate filter bodies and other honeycomb structures the cells of which are selectively charged with a plugging or other flowable material. Solid coverings are applied over the end faces of a honeycomb structure, preferably an adhesive backed transparent thermoplastic film such as polyester, openings are created through the covering, preferably by melting the thermoplastic film, and the sealing or other flowable material is charged through the openings formed in the covering into the underlying cells.A porous walled honeycomb structure having coverings adhered to its end faces with selective openings therethrough is itself a solid particulate filter of some usage. A more substantial solid particulate filter body may be formed by charging a more durable sealant through the openings to form plugs and removing the coverings.

Abstract: A modular structure is constructed in which includes a wall formed of an inner and outer panel defining a cavity therebetween, wherein a perforated stud is disposed between the inner and outer panels, with one of the panels being secured to a first portion of the stud and the other of the panels being secured to a second portion of the stud such that the first and second portions are relatively movable but are interlocked in a fixed position within the cavity such that the inner and outer panels of the wall can be maintained in spaced apart relationship by a preselected distance. The method of construction includes placing one modular structure on top of another. Additionally, the retainers can be used for maintaining a wall in a selected position relative to a floor and ceiling.

Abstract: An ice skate having a metal blade with the upper edge thereof embedded in the lower portion of the body of the skate which is made of plastic material. Plastic material integral with the body of the skate extends through longitudinally directed through-holes in the upper edge of the blade. There are at least three through-holes, including a centrally disposed centering through-hole which is entirely filled with plastic material integral with the material of the skate body. The other through-holes, located respectively forwardly and rearwardly of the centering through-holes, are only partially filled with plastic material integral with the body of the skate, the ends of the other through-holes which lie nearer the central through-hole being empty whereby to allow longitudinal shifting of the molded plastic body of the skate as it cools and hardens after having been injection-molded about the upper edge of the skate blade.

Abstract: A shock-absorbing wheel assembly having an annular cast iron core member disposed concentrically about an annular bearing seat in spaced relation thereto, with the core member having passageways extending radially therethrough. A continuous integral mass of moldably polyurethane is provided to cover the exterior surface of the core member with a predetermined thickness, to fill the passageways in the core member, and to fill the spacing between the core member and the bearing seat. A method of forming the wheel assembly is provided, which includes locating the core member and bearing seat within a cylindrical mold cavity, permitting flowable polyurethane to flow into the interconnected spacings and passageways, and allowing the polyurethane to cure.

Abstract: A roof flashing and method of making same in which both the collar and base member of the flashing are made of elastomeric material. The base member is molded first and has an opening therein surrounded by a stepped flange provided with a series of circumferential slots therein. The collar is molded onto the base member during a subsequent molding operation in which the material of the collar is injected through the slots and completely around the top, bottom and inner side edge of the flange to form a series of closed loops thus providing a positive mechanical lock between the collar and base member. Also, the heat of the elastomeric material of the collar during the second stage molding process causes some melting of the elastomeric material of the base member whereby the collar and base are also fused together.

Abstract: An impervious article of plastic material including a reinforcing frame member imperviously sealed within the plastic material which forms an outer covering thereof, is obtained by disposing the reinforcing frame member within a channel formed in shock resistant thermoplastic material, by heating a portion of the shock resistant thermoplastic material on outer sides thereof opposite sides defining the channel in which the reinforcing member is disposed, and over an area near an open portion of the channel to at least the softening point of the shock resistant plastic material, and then injecting a compatible plastic material substantially resistant to cracking under stress onto the outer sides of the thermoplastic material and over the open part of the channel in which the reinforcing member is disposed.

Abstract: A window with integral molded stile or frame has been disclosed along with a method for making it. The system according to the invention makes it possible to mold by injection two plastic parts in molding cavities (1', 2'). Material is first injected into the cavity (2') while a core (9) delimits a hole (15) in the molded part. Then the core (9) is removed from the hole (15) and the cavity (1') is placed facing the hole. Material is injected into this cavity. The material passes into the hole (15) and fills an enclosure (14) which molds an assembly stud for the parts molded in the cavities (1', 2').The invention is applicable to making a window-stile unit for automobiles.

Abstract: A flexible tube for use in an endoscope comprises a flexible basic tubular core structure and a homogeneous thermoplastic synthetic resin tube bonded to the outer surface of the tubular core structure to form a coating layer by positioning the synthetic resin tube tightly over the basic tubular core structure with a contact pressure therebetween and heating the synthetic resin tube to a temperature higher than a softening point of the thermoplastic synthetic resin forming the same. A flexible tube having flexibility which varies in a step-wise manner from one end of the tube to the other is obtained by integrally bonding as a whole two or more homogeneous thermoplastic synthetic resin tube sections formed of respective resin materials having different hardnesses to the outer surface of the tubular core structure to form a coating layer in an analogous manner.

Abstract: A method of manufacturing boat parts submerged when in use comprises producing a metallic skeleton structure shaped for easiest production by conventional metal-forming methods, and covering this structure in a mold with an adhering layer or coating of a thermoplastic resin or a rubber-based vulcanizable substance. The inner walls of the mold have high finish and the desired streamlined outer shape of the finished product, such as a lower unit of a propulsion system, or a propeller and the like. The coating functionally neutralizes the technologically conditioned and generally not streamlined shapes of the skeleton structure and provides a protection of the skeleton structure against electroerosive corrosion.

Abstract: A molding process for molding an elongated elastomeric member (60) with wire mesh sleeves (16) bonded to the ends (14). A molding preform (10) of elastomeric material is positioned within a seamless mold cylinder (26), and the open ends of the wire mesh sleeves (16) are mounted to end plug assemblies (30) slidably received into the mold cylinder (26) and positioned against the ends (14) of the preform (10). A specialized profile is formed into surfaces (44) of the respective end plug assemblies (30) and by heating of the mold (26), the ends (14) of the elastomeric preform (10) are molded to the profile, as well as bonded to the reinforcing wire mesh sleeves (16). Vacuum is applied to the interior of the mold to draw outgassing vapors through relief spaces therethrough. The completed elastomeric member (60) is removed from the mold cylinder (26) by stretching, the consequent reduction in diameter enabling ready separation from the mold cylinder (26) and removal thereof.

Abstract: The method of battery molding metal-reinforced panels of matrix forming materials like, for example, concrete is improved by the use, as reinforcement for each panel, of a stratiform and biplanar structure formed of two spaced coextensive metal sheets in a parallel and mutually supporting arrangement. Preferably, at least one sheet has a multiplicity of perforations as well as a multiplicity of protrusions. The reinforcements are provided with partitioning layers and stacked in the cavity of a molding box. Upon casting and setting of the concrete or the like material into the cavity compartments metal-reinforced panels are obtained in which the biplanar reinforcement extends substantially through the panel. The tiltable molding apparatus for use in battery-molding of the panels includes a molding box in combination with at least one fluid-cushion or fluid-bag capable of varying its outer shape in response to the amount of fluid within said cushion.

Abstract: A fleece is employed for the distribution of casting resin over a component surface to be sealed. Prior to the introduction of the casting resin, pressure is applied on the fleece with a heated stamp in order to smoothen the fleece. Through increased temperature of the stamp, or through a solvent, the fleece can be readily cemented together with the component surface. It is thus ensured that the fleece rests uniformly on the entire component surface to promote a favorable distribution of the casting resin.

Abstract: A pull strap handle meeting all the standards of the automotive industry is formed economically with molding operations. The handle is formed with a strip 15 of strong resilient material with high tensile strength that serves as a support element. Support element 15 is enclosed within a molded cover having a firm outer side 17 and a soft inner side 18. Soft side 18 is molded of foamed resin material directly onto support element 15 to form a secure bond. Firm side 17 can be molded in a single operation with soft side 18 or can be molded separately, attached to support element 15, and located in a cavity mold that forms soft side 18. The cover can also be molded to support element 15 within a cavity mold that forms both cover sides 17 and 18 or the cover can be extruded onto support element 15 in a continuous operation.

Abstract: Method for making a wheel composed of a rigid plastic inner section forming the wheel hub and rim and a resilient plastic tire section encircling the rim. A key formed integrally with the rim extends radially outward therefrom and interlockingly projects into the tire so as to mechanically connect the tire to the rim all around the wheel. The key can be formed with axially extending portions spaced radially outboard of the rim and terminating flush with the outer surface of the tire section so as to provide colored side wall decorations at one or both sides of the wheel. A method of molding the tire directly onto the discoid section is also disclosed.

Abstract: Concrete pipe including a hollow tube of concrete with a grid of reinforcing bars embedded therein. A plurality of inserts are embedded in the concrete pipe in between the bars of the grid and have passageways therethrough to form slots between the interior of the concrete pipe and the exterior thereof at predetermined locations to form slotted concrete pipe. The inserts are attached to the grid of reinforcing bars during formation of the pipe and the concrete is introduced to surround the grid and inserts and is permitted to set. Thereafter, the formed concrete pipe contains embedded reinforcing bars and inserts in predetermined locations resulting in a slotted reinforced concrete pipe.

Abstract: An apparatus for manufacturing a fastener chain having solid sections by repeating the steps of providing a tape having perforated sections which include holes punched in a longitudinal edge of the tape, and solid sections, which are free of holes, alternating with the perforated sections, supplying the tape so that the perforated section thereof is placed between a stationary mold and movable mold, applying tension to the tape to stretch it, and then injection-molding fastener elements onto the tape at the holes. Stretching of the tape is accomplished by a sprocket wheel provided adjacent a freely rotatable drum. Teeth on the circumferential surface of the sprocket wheel are caused to recede below the circumferential surface of the freely rotatable drum when a solid section of the tape passes over the drum.

Abstract: A blow-moulded hollow body has an insert anchored in a wall of the hollow body by wall portions which penetrate openings in a projecting portion of the insert from both sides during the blow-moulding process and which are welded together at these openings. A wall portion of the hollow body is afterwards cut away to form an access opening and the insert is adapted to receive a closure cap for this opening. In another embodiment, the insert has a carrying handle attached thereto.

Abstract: An improved support web, particularly for use in the construction of furniture, comprises a band, which may be made of plastic material having spaced, parallel, longitudinal reinforcing threads such as glass fibers embedded therein and a connecting member of plastic material at least one end of the band of which is formed in one piece about the band end by a molding or casting process to surround, on all sides, a folded end of the band having its layers secured together, there being holes passing through the folded end of the band which become filled with material of the connecting member. The connecting member has a strong connection with the band and may be nailed or stapled to the frame of a piece of furniture to connect the support web to the frame. Alternatively, the connecting member may be provided with a hook formation or with a molded-in hook or hooks for connecting it to a frame.

Abstract: Method for making a collapsible dispensing tube in which plastic fabricating materials other than conventional materials can be selected which are more suitable, since the pressure in the process is increased while the temperature is decreased. This manufacturing method utilizes a locking taper resulting in a better bond between the headpiece, barrier member, and the inner wall of the collapsible tube and substantially eliminating blowby of plastic material into said collapsible tube. The barrier member extends to and is tightly engaged with the adjacent inner wall of the collapsible tube and substantially eliminates bypass of gases around the barrier member. The method of manufacture permits the selection of the most suitable thermoplastic material for the intended use from a group of materials.

Abstract: An ice skate runner for use in a skate holder has an elongated metal body with a solid central portion and a pair of elongated cut-outs, one on either side of the central portion extending towards the end of the runner. The portion of the cut-out adjacent the central portion is wide and the cut-out tapers downwardly in width towards the end of the runner. The plastic holder for the runner is molded around the latter so that the plastic flows through the cut-outs. The solid central portion of the runner locks the plastic at that area and forces the plastic on cooling to shrink from both ends of the runner towards the center, relieving stress in the combination. Spacer pins are inserted in the mold adjacent the ends of the runners during the molding process and then removed thereafter to allow shrinkage space between the ends of the holder and the ends of the runner.

Abstract: A substantially U-shaped pedestal liner is provided for disposal between an associated pedestal leg and journal box of a railway pedestal truck and the liner is comprised of ultra high molecular weight polymeric material and has a reinforcing structure embedded in the polymeric material which serves as a matrix therefor and substantially completely surrounds the structure and the structure has openings therein for receiving the polymeric material completely therethrough while enabling better embedment of the structure whereby the structure provides reinforcement while preventing cold flow of the polymeric material.

Abstract: A method is disclosed for the repairing of extensive damage to plasterboard areas wherein wet plaster will normally not hold in such a large repair area. The method includes the cutting through the paper surface layer of the plasterboard material in an approximately circular shape around the damaged area. The exposed plaster of the plasterboard can then be sanded by such a tool as a power rotating sander such that the plaster within the plasterboard is removed to a predetermined depth. A plate member having a thickness less than this predetermined dimension and preferably on the order of 0.014 inches is then placed over the damaged area within the removed plaster area. This plate member is fixedly secured to the undamaged area of the plasterboard within the defined circular area. The plate member is preferably perforated throughout for ventilation and securement of plaster thereto.

Abstract: A wear-resistant liner for center plate structure of a railway vehicle is provided and such liner is defined by an ultra high molecular weight polymeric material having metal reinforcing means embedded in and surrounded by the polymeric material which serves as a matrix for the reinforcing means and the metal reinforcing means comprises a metal structure having openings therein for receiving the polymeric material completely therethrough and enabling better embedment of the metal structure with the metal structure providing reinforcement and preventing cold flow of the polymeric material, and with the metal structure being a grid-like structure.

Abstract: A method is disclosed for assembling fluidic spray devices wherein a fluidic element formed on the surface of a body member is expeditiously sealed to form the device. The essence of the invention is the injection molding of plastic around or through the body and a cover plate, or into a prefabricated housing into which the body member is inserted, to preload the parts and force them into a permanent sealed assembly. In one embodiment the preloading is achieved by shrinkage tension of injected plastic material surrounding or penetrating the parts. In a second embodiment the preloading is achieved by injecting plastic material into a gap or gaps in a product housing containing the body member so as to force the element surface against a sealing surface.

Abstract: A seamless expandable bag filter of nonwoven material using conventional filtering media and having 62% greater extended area than other commercially available extended arm filters and incorporating broad, flat sealing collars or plates on each side of the neck of the bag and sealing them together to insure a no-leak installation.

Abstract: A process of manufacturing tires having a crown reinforcement from one or more liquid or pasty materials which solidify in a core mold is improved due to the fact that prior to the filling of the mold there is placed in the mold an elastically deformable annular net formed of two superimposed plies of parallel wires crossed from one ply to the other at an angle at most equal to 90.degree. with respect to the circumferential direction of the tire, at least the outside of the wires being formed of an elastic and weldable material permitting welding of the wires of one ply to those of the other ply at the points where they intersect, the net being placed in the mold with its edges equidistant from the equatorial plane of the tire.

Abstract: A pacifier having a rigid safety shield formed of non-resilient material integrally formed with a nipple and ring of soft conventional rubber-like pacifier material wherein the rigid shield is located in a molding cavity in the form of a pacifier, an interference member is axially disposed through the shield, nipple and the ring section of the cavity and thermosetting or thermoplastic material is injection molded into the cavity to rigidly retain the rigid shield member and form an integral pacifier.

Abstract: A first movable mold with both a runner and a core type mold is moved toward a stationary mold, and simultaneously a second movable mold supporting a motor bracket of plate metal is moved toward the stationary and first movable mold until all the molds engage one other to form around the core type mold a predetermined space to which the bracket is exposed a molten resin is poured into the space through the runner to mold a gear box integral with the bracket.

Abstract: An apertured plating mask having a polyurethane layer thereon to enhance the sealing thereof to a metal has been provided. The plating mask has a substantially smooth layer for contact with a metal as well as a polyurethane covering of the inner perimeter of the apertures of the plating mask whereby definition of selected areas for plating is enhanced. The apertured plating mask is fabricated by a unique molding process wherein a fabricated mask blank is positioned in a mold member, polyurethane is poured through and over the mask blank, cured and treated in the mold member to provide the apertured mask with a polyurethane layer having a substantially smooth surface. Also, a process and apparatus are provided for plating selected areas of a metal wherein a metal is contacted on one surface with a rubber-covered rigid plate and on the opposite surface with an apertured plating mask having a layer of polyurethane with a smooth surface thereon.

Abstract: A weighted belt for securing to the leg of a swimmer for exercising purposes. The belt is constructed using an elastic latex strip. Lead weights are positioned on the strip, covered by a layer of gauze, which is then covered by the latex material to provide a sealed one-piece structure. The weights have holes therein such that the latex covering material fills the holes to firmly secure the weights to the belt. The ends of the belt are secured by molded buttons on one end engaging openings in the other end.

Abstract: A thermoplastic lined plug valve is prepared using a plug having a nonlocking taper and a stem at the small end of the plug. The plug is seated initially by forcing the plug into the plug cavity, raising the temperature of the plug valve above the service temperature of the valve body lining until the valve body lining conforms to the valve plug. The valve is then cooled to a temperature below the service temperature of the body lining.

Abstract: Method and apparatus for continuous manufacture of a laminate comprising a layer of a conductive polymer and at least one electrode. A tape electrode and a heat-softened conductive polymer are fed simultaneously through an elongate aperture of substantially closed cross-section formed by a plurality of rollers, whereby there is produced a laminate in which the conductive polymer layer has a controlled cross-section. Preferably the electrode has a plurality of openings therein and is fed through the aperture so that there is at least one point on the electrode, as it passes through the aperture, which coincides with an angle which is formed by two of said rollers and which is at most 90.degree.. Particularly good results are obtained when the roller which contacts the electrode has a plurality of indentations therein, so that conductive polymer not only penetrates into the openings in the electrode but also passes through those openings which overlie the indentations in the roller.

Abstract: A method of manufacturing the molded hub of a print wheel of the type having a central axial passage of precise diameter and a plurality of elastically deformable, concentrically arranged character carrying radial arms. A metal ring carrying radial passageways is centered in the mold cavity used for forming the hub, etc., and a plastics composition is injected into the mold cavity only through the center of the ring and by way of the radial passageways whereby the metal ring becomes a unitary permanent part of the hub and defines the central axial passage. After the molding, the molded structure is released from the mold and the remainent central plastic plug easily is sheared from the ring, as by punching, for example. Remainent plastic material left within the radial passageways functions supplementary to maintain the stability and concentricity of the ring and hub assembly.

Abstract: Laminates of resinous polymers of olefins and elastomeric, open celled polyester urethane foams and method and apparatus of their production. Examples of resinous polymers include polyethylene, copolymers of ethylene and propylene, polypropylene, polystyrene and impact polystyrene. Optionally, the foam can be provided with a plasticized vinyl or fabric layer, opposite the surface to which the polyolefin is applied.

Abstract: A method of producing a piston cylinder assembly for use in a windmill in which a compression ring is formed by casting molten metal around a piston head having a number of drilled holes on its side surface while the piston head is positioned within the cylinder. The compression ring formed is attached to the piston head by solidified metal within the drilled holes.

Abstract: The invention relates to a method of manufacturing a sieve which is composed of several planar sieve sheet sections, which are lying adjacent each other and are separated by a plurality of slots and are communicating with one another at a common point. The sieve sheet sections when so arranged are placed into a mold, and thereafter plastics material is introduced into the mold to form ribs that are covering the slots and that are holding in place and stiffening the rims of the sections that form a slot. The sieve sheet may be formed as an integral part or alternatively may be made of several sieve sheet sections that are held together at the peripheral region by connecting means. The plastics ribs covering the slots may be integrally formed with a container holding the sieve sheet.

Abstract: An apparatus for injection molding composite articles from two materials includes a rotary mold block carrying a two material mold half between a first material mold half and a second material mold half; the rotary block providing, in sequence, a first material mold cavity and a composite material mold cavity in which latter cavity the second material is injected over, and preferably in positive engagement with, the first material. Core pins are carried in the rotary block which includes means to index the pins for providing core areas in the first material and subsequently retracting the pins so that the second material can flow into the core areas for positive engagement of the composite molded materials.

Abstract: Composite sheets comprising expanded graphite, a sheet-like metallic core inserted therein and, if desired, a binder for the expanded graphite. In one embodiment, gaskets are prepared from the composite sheets.

Abstract: An outer mold part is positionable over an inner mold part. Lever means are carried on opposite sides of the outer mold part and operable by a lifting force to exert a separating force between the outer and inner mold parts. Lever means are carried by the outer mold parts for locking the molded article to it. The outer mold part and the molded article are lifted upwardly together as an assembly and are removed entirely from the inner mold part. The assembly is then set down, the outer mold part is unlocked from the molded article, the outer mold part is then picked up and removed from the molded article, and then the bottom is poured in and is connected to the molded article.