Abstract: A device for supplying plastic material into a flask under pressure and a flask with the device, which are used for preparation of a denture. The device includes a cylinder having the inside end communicated to a cavity in the flask, a piston slidably inserted in the cylinder, a spring urging the piston toward inside of the flask, a stopper restricting the outside stroke end of the piston, and a device for adjusting elastic force of the spring. The adjusting device preferably includes a spring receiver abutting against the outside end of the spring, a screw-mechanism for moving the spring receiver in the axial direction of the cylinder, and a handle member for operating the screw-mechanism.

Abstract: A vacuum bag including a non-porous material having impressed therein a three-dimensional pattern which defines a plurality of interconnected channels, methods for producing the vacuum bag, molding methods using the vacuum bag, and improved composite articles produced by the molding method, are disclosed.

Abstract: A mold for producing thermoplastic pieces by blow process, which pieces are used for storing liquid and solid materials, having two equal symmetrical parts (1) and (1'), each of which is formed by a vertical plate (2) and provided with extensions (3), adjacent the upper and lower edges of the plate (2). Screws (4) which are screwed into holes (5), provided in one lateral edge of another plate (6), and is allowed to slide along channels (7); the plate (2) is provided with a slit (8) through which the screw (9) passes over plate (6) and is screwed into the hole (10) provided on another plate (11) which is orthogonal to plates (2) and (6).

Abstract: A plastics material mold for casting a contact lens from curable material. Disposable male and female mold members (20,22;50,51) define a mold cavity and each having a curved surface (21,23;52,54) for molding respective optical surface of the contact lens, the male mold member having a shoulder (26,53) which is a slidable fit with a generally cylindrical, e.g. frusto-conical, surface (25,55) on a female mold member to permit relative mold member movement during curing without substantially affecting the optical quality of the molded optical surfaces. The sliding fit shoulder and female surface are relatively simple to mold with accuracy and thus permit the edge (29) of the eventual cast lens to be formed relatively reliably and accurately.

Abstract: A method of die forming using an elastically deformable die is characterized by using a die provided in advance with a prescribed pattern of thickness variation, allowing the die to be elastically deformed by the pressure it receives from the material being formed during the forming operation, and forming the material to the configuration resulting from the deformation.

Abstract: A mold for manufacturing a skin covered foamed plastic article, with which it is possible to place the skin cover at a desired position, without spoiling or damaging the skin cover, such that the skin covered foamed plastic article of a desired shape without any deficiencies such as wrinkles and dents can easily be manufactured. The mold includes an upper mold; and a lower mold, to be assembled with the upper mold in order to form a cavity in which a liquid foam resin undergoes foaming process to become the pad member, over which a skin cover is to be placed, the lower mold including at least one windows at which the skin cover can be pushed outward by pressure of the liquid foam resin.

Abstract: Gasket used in a fabrication method, wherein a methylmethacrylate prepolymer or a mixture of unsaturated monomers, whose main constituent is methylmethacrylate, or the unsaturated monomer or monomers themselves is (are) introduced into a mold comprised of two parallel plates separated by said gasket, and the mold is brought to a temperature sufficient to complete or carry out the polymerization. The gasket consists of a core of plasticized poly(vinylchloride), said core being sheathed by a thin layer of thermoplastic polymers chosen from among propylene polymers and saturated polymers, said thermoplastic polymer being capable of retaining its elasticity at temperatures ranging from 20.degree. to 120.degree. C. and having a melting or softening point higher than 115.degree. C.

Abstract: A polyolefin mould for casting contact lenses from a polymerizable monomer composition which shrinks on polymerization, said mould comprising: male (50) and female (51) mould halves at least one of which has a flexible diaphragm portion (53, 54) which is shaped to provide a surface corresponding to a lenticular surface, said mould halves (50, 51), when closed together, cooperating to define a mould cavity (52) for receiving a volume of said monomer composition, at least one of said mould halves (50, 51) having a shoulder portion (55, 56) surrounding said cavity and shaped to engage with said other mould half to define an edge moulding portion of said cavity: whereby in use said diaphragm (53, 54) is deflected into said cavity under forces exerted on said mould by said monomer composition when polymerized in said closed cavity (52), thereby compensating for the shrinkage occurring on polymerization and avoiding the formation of bubbles or voids in the resulting lenses.

Abstract: The apparatus includes a pair of molds each having a peripheral flange provided with a mating surface. The molds are clamped by a suitable number of clamp assemblies for clamping the flanges of the molds so that the molds are secured together with the mating surfaces in contact with each other. The clamp assembly includes a pair of clamp members for engagement with the flanges of the molds, a shaft passing through the clamp members, a first stop member provided on the shaft for engagement with one of the clamp members, a spacer provided on the shaft for axial slidable movement and adapted for engagement with the other of the clamp members, a second stop member provided on the shaft for engagement with the spacer at an end opposite to the other of the clamp members.

Abstract: A mould assembly for moulding ice sculpture having (i) complementary mould members (1,2) of low thermal conductivity material, the complementary mould members being releasably mated together via complementary peripheral flanges (3,4) secured together by nuts (8,14) and bolts (19,11), defining an open topped mould cavity; (ii) a water impervious flexible mould liner (18) conforming to the interior of the cavity and including a split region (19) around at least part of its periphery, having mating portions, each of the mating portions having extended (20,21) lips adapted to be sealingly clamped togehter between adjacent mould members; (iii) a thermally insulating cover adapted to close the open top of the mould cavity, wherein the improvement lies in the provision of: (a) perforations (15) thorough the mould members at regions corresponding to protuberant parts and (b) providing thermal insulation (16) to the mould assembly at regions corresponding to narrow parts of the ice sculpture to decrease the rate of fr

Abstract: A meat mold cover assembly that is simple in construction, easy to engage and disengage from the mold, adds only a small additional volume to the space occupied by the product, and promotes the production of a molded product having uniform dimensions is provided by the use of an internally biased cover assembly that uses points of supports spaced along the length of at least one side of the mold to allow easy release and attachment of the cover assembly to the mold and integral biasing means acting on the lid along at least two lines of action to provide a balanced pressure on the meat. In a more specific form the cover assembly provides these benefits by using at least three spring assemblies that act directly on and within the periphery of the lid on at least two lines of action. The springs are counter acted by a cover support. The support is attached to at least two opposite sides of the mold through one or more hold down bars and pivotable links to engage each side of the mold.

Abstract: A polyolefin mould for casting contact lenses from a polymerizable monomer composition which shrinks on polymerization, said mould comprising: male (50) and female (51) mould halves at least one of which has a flexible diaphragm portion (53, 54) which is shaped to provide a surface corresponding to a lenticular surface, said mould halves (50, 51), when closed together, cooperating to define a mould cavity (52) for receiving a volume of said monomer composition, at least one of said mould halves (50, 51) having a shoulder portion (55, 56) surrounding said cavity and shaped to engage with said other mould half to define an edge moulding portion of said cavity; whereby in use said diaphragm (53, 54) is deflected into said cavity under forces exerted on said mould by said monomer composition when polymerized in said closed cavity (52), thereby compensating for the shrinkage occurring on polymerization and avoiding the formation of bubbles or voids in the resulting lenses.

Abstract: An apparatus is disclosed for the reduction of mold cycle time. A heat recoverable member in a compressed state is placed within a channel defined relative to the surface of a mold. A hardenable liquid used to form the article then flows in an accelerated manner through the channel. Thermal energy supplied to the heat recoverable material thereafter causes the heat recoverable material to expand within the channel, thereby displacing the hardenable liquid from the channel. The temperature of gelation of the hardenable liquid and the recovery temperature of the heat recoverable material may be selected such that the channels are substantially filled by the heat recoverable material prior to the hardening of the hardenable liquid. In this manner, the heat recoverable material becomes flush with the surface of the mold prior to hardening of the liquid so as to yield an article of manufacture having a relatively planar surface.

Abstract: An apparatus and method is provided for producing castings from low melting point alloys which expand upon hardening for use in radiation treatment. An apparatus (10) is provided with a resilient ring (22). As the alloy expands in cooling, the resilient ring deforms outwardly to accommodate the expansion. The molding apparatus (10) can then be disassembled to remove the hardened plate with little risk of harm to the plate.

Abstract: Mechanisms and methods are provided in conjunction with the molding of stuffable food products into a shaped loaf that is suitable for automatic slicing into substantially uniform slices. Included is an expansion and contraction compensation mechanism that includes a ratcheting assembly and a biasing assembly that cooperate to permit adequate expansion of the food product during cooking thereof while still retaining enough biasing force to continually compress the product being molded during contraction which occurs upon chilling the food product.

Abstract: An elongate packing is sandwiched between two sheet-like mold members in an encircling manner to define a mold cavity therebetween, then a thermosetting plastic material is poured into the mold cavity, and the thermosetting plastic material is heated and set in the mold cavity. The upper and lower mold members are held against deformation transverse thereof so as not to be deformed by the shrinkage of the thermosetting plastic material when the latter is set, and the packing is allowed to move transversely thereof for following the shrinkage of the thermosetting plastic material when the latter is set. In some embodiments, the packing comprises a packing body adapted to be sandwiched between the mold members for preventing the plastic material from flowing out of the mold cavity with a flange joined to the packing body and adapted to be held against peripheral edges of the mold members.

Abstract: Moldings (41) of fibre/resin matrix composite material are vacuum bag molded "net-to-size" by providing periphery elements (20-22) on the molding face (11) of the tooling (10) and allowing them to slide on the molding face during curing of the molding. Buttstrap edges (FIG. 3) can be provided in this way, on the molding, as an integral part of the molding process.

Abstract: The invention provides containers useful for freezedrying of biological and other materials which can be advantageously subjected to a lyophilization process, such materials including proteinaceous materials from which moisture is removed in order to preserve the material in a dry, shelf-stable form. The present containers allow lyophilization of the contained material with a minimum of time and energy expenditure by forming the material into a frozen shell to increase the surface area of the material and to minimize the thickness of a given quantity of material which is to be lyophilized. In a typical embodiment of the invention, a container is provided with a congruent, flexible core which is inserted into the container to force the material into the space lying between the container and the core. Expansion of the material on freezing acts to deform the flexible core rather than to break the container.

Abstract: A method and apparatus are disclosed for the reduction of mold cycle time. A deflatable member is positioned flush with the surface of a mold in an opening defined downwardly therein. Prior to flow of a resin or other hardenable liquid within the mold, the deflatable member is deflated so as to define a resin flow channel across selected portions of the mold surface. Prior to hardening of the hardenable liquid within the mold, the deflatable member is inflated so as to become flush with the surface of the mold so as to yield an article of manufacture having a relatively planar surface.

Abstract: A method and apparatus for packing a meat product, such as ham, in foil, in which a mould is used to accommodate a bag-shaped foil. The apparatus includes a first support member for supporting the bag and the mould. A mechanism is also provided for turning-down the collar of the bag around the top edge of the mould. A second support is provided for supporting the mould containing the bag-shaped foil filled with meat product together with a second mechanism for turning-up the collar of the bag. A third support is provided for supporting the mould with the filled bag-shaped foil, and a sealing appliance is provide for sealing the collar.

Abstract: A method and apparatus for molding and casting ophthalmic lenses includes a front surface die and a back surface die slidably and removably received in the bore of a molding or casting apparatus. Molding or casting compound is introduced by conventional means between the two dies, and the dies are urged together to impress the die surfaces on the compound as the compound is cured by thermal or chemical means. At least one of the dies includes at least one gate channel formed in the edge thereof parallel to the axis of the bore and extending from the optical forming surface to a point adjacent to the opposite, external die surface. In compression molding, the gate channel comprises a vent through which excess molding compound is discharged from the molding cavity as the dies are urged together. As the gated die is fully inserted in the bore, the gate channel opening to the exterior is sealed, thus limiting the discharge effect and controlling the thickness of the molded part.

Abstract: A method of producing a layer of plastics material between two glass panes and an apparatus for performing said method, wherein the plastics material is filled in liquid form between the two glass panes which are in an inclined or vertical position and maintained parallel and sealed at their outer edges, are characterized in that the two glass panes are pressed against each other at their outer surfaces by one or a plurality of rotatable devices to achieve pressure guided in parallel and extending preferably over the total width of the glass panes, which pressure devices are movable along the total length of the glass panes, and that the pressure devices are moved at the curing rate of the plastics material from one end of the glass panes to the other end of the glass panes relative thereto.

Abstract: Apparatus for producing an ice sculpture comprising a compressible gasket arranged between a pair of mold halves which are yieldably joined by spring-loaded releasable locking toggle assemblies and spring loaded hinge assemblies respectively arranged along opposite sides of the mold halves to permit the formation of large ice sculptures.

Abstract: A blowing mould has a mould with a terminal part which can be adjusted in axial direction relative to the mould by means of a threaded spindle and an adjustment nut. The terminal part is guided in a pressure sealed manner in the mould and is provided with a projecting rim which effects a seamless transition between the terminal part and the inner wall of the mould.

Abstract: There is provided a mold fabricated from thermoplastic material incorporatinog a thin flexible, substantially knife-edged rim projecting from the periphery of the mold cavity on both the male and female portions thereof, and having a reservoir to contain additional monomer, such reservoir being separated from the mold cavity by the conjunction or mating line of the peripheral rim projections.Such molds are useful for the molding of optical implants which do not require further machining or similar treatment.

Abstract: An expandable enclosure is provided for freeze forming a processed mass of meat or poultry products into a desirable and naturally occurring cut of meat. This enclosure includes an elongate housing with an opening for receiving the mass, a displaceable cover which the product mass displaces as it expands during freezing, and fastening apparatus for providing resistance to the separation of the cover from the housing so that the cover can maintain pressure on the mass to expel voids and excess moisture from the mass and to press the mass into the shape of the enclosure.

Abstract: A system for molding elongated ribbon-like products from thermoplastic materials utilizing a plurality of molds which are moved in tandem along a production line. As the molds are moved along the line at successive stations they are, while open, thermally adjusted to a temperature suitable for forming the product to be molded and then a ribbon of plastic is deposited in them. They are then closed and cooled and reopened and the molded product removed. The system utilizes only enough molding pressure to assure distribution of the plastic to all parts of the mold cavity and shaping of the molded product to the geometric design of the mold. The system includes a transfer means for the molds which returns the emptied molds for recycling through the molding process.

Abstract: A structural ice mold of the large, single use type, preferably made of FDA approved low density polyethylene plastic, is rotationally molded into a shape forming a hollow cavity on the inside thereof which defines the ice sculpture or figurine to be formed therein. In the improvement of the invention a narrow peripheral ridge or U-shape rib is extended vertically around the outside of the ice mold, preferably at the parting line of the permanent parent mold. The one-piece mold may be opened at the U-shape rib by cutting across the side of the rib at positions away from the surface of the ice figure formed in the mold, rather than by cutting perpendicularly through the mold surface and potentially into the ice figure therein. An additional improvement in ice molds resides in a hollow core formed in the base of the mold which allows for expansion of water in the mold when it changes phase into ice, thereby reducing stress and cracking in the finished ice form.

Abstract: A clear, cylindrical, flexible gasket having an annular shoulder located on the interior surface thereof, midway between the ends. The gasket is sized to accept two lens half molds, one on either side of said shoulder to form a lens casting cavity. Each side of the shoulder has first and second annular protrusions extending therefrom for contacting and providing an annular double seal along the edges of each of the half molds. The surface of the shoulder which forms the side of the lens casting cavity is curved in order to reduce stress to a minimum during the shrinkage of the lens casting resin during the cure period. In addition, the casting surface of the shoulder is formed such that the final molded lens will have an outer ridge thereon. One end of the cylindrical gasket has an enlarged edge for additional strength and is provided with index markings thereon which extend beyond the edge and down the outer side of the clear gasket. Two identical fill ports are provided on opposite sides of the gasket.

Abstract: An adjustable mold for casting asymmetric concrete highway divider sections includes a fixed sidewall, a movable sidewall, and two end walls. Each of the end walls is divided vertically into a first fixed panel and a second adjustable panel. The old can be set up to produce a barrier section that accommodates any difference in grade levels between the separated roadway lanes, within a preselected range, by adjusting the height of each second end panel relative to the adjacent first end panel and by adjusting the height of the movable sidewall to match the second end panels. All adjustments are made by means of simple jack screws. The end walls and the movable sidewall are mounted on hinged frames that can be swung open to facilitate removing a section casting from the mold.

Abstract: An apparatus and method for molding polycarbonate lenses is disclosed in which the lenses are formed in a single injection molding operation. Polycarbonate is injected into a cavity between two movable dies which are forced apart by the injected polycarbonate. These dies are then urged together forcing a portion of the injected polycarbonate back through the same port through which the polycarbonate was injected. The finished lens does not have the knit line normally associated with injection molded lenses.

Abstract: A packaging system for encapsulating an article within a solid foam material. An article to be encapsulated is supported on a base. A wall enclosure is disposed on the base to form a mold cavity. At the top of the base and above the article to be encapsulated is a cover. Expandable plastic foam in liquid form is introduced into an orifice of the base and the expandable plastic foam advances through a passageway in the base and is discharged from an orifice in the base into the mold cavity to encapsulate the article. The foam material in liquid form solidifies into a solid plastic foam material for packaging the article.

Abstract: A gasket assembly for casting optical lenses includes a first gasket member having a cylindrical opening therethrough and an annular flange extending radially inwardly in the cylindrical opening. One surface of the flange is adapted to receive a casting lens die, and may be disposed in a plane not perpendicular to the axis of the cylindrical opening. A second gasket member is adapted to be received in the first gasket member, and includes an inwardly extending annular flange having one surface adapted to mate with the flange of the first gasket member. The other side of the annular flange of the second gasket member includes a shaped surface adapted to receive a lens casting die having the capability of conferring on the cast lens any combination of power and cylinder characteristics, the shaped surface being configured to mate and seal with the peripheral area of the compound surface of the die.

Abstract: An apparatus for molding an article, such as a preform, used in making information recorded discs, includes top and bottom mold members having recesses in their approved surfaces. The top mold member is mounted on the end of the piston rod of a pneumatic cylinder which is adapted to move the top mold member into mating relation with the bottom mold member so that the mold recesses form a mold cavity. The bottom mold member includes means for injecting a plastic mold material into the mold cavity. To mold a preform, the top mold member is moved by the pneumatic cylinder toward the bottom mold member to a collapsed position of the mold members where the mold cavity is of a volume less than the desired volume of the preform being molded. Plastic mold material is injected into the mold cavity until it is filled and additional mold material is injected into the mold forcing the top mold member away from the bottom mold member until the cavity is of the desired volume of the preform.

Abstract: Apparatus is provided for fabricating ophthalmic lenses of the single vision and bifocal type comprising a holder having a base portion for support thereof. An outer circumferential side wall extends upwardly from the base portion and terminates in an upper surface which is disposed in substantially parallel relationship of the bottom surface of the holder base portion. The side walls comprise a plurality of equally spaced support posts. The support posts are provided with a lower step and an upper step with the upper step being disposed radially outwardly of said lower step. The lower steps define a parallel support surface upon which there is disposed a lower mold. The upper steps define a parallel support surface upon which is disposed an upper mold. The upper and lower support surfaces being disposed in substantially parallel relationship.

Abstract: Apparatus and method for constructing a modular concrete shell housing unit in which complementary counterpart form assemblies are detachably connected on a supporting concrete floor slab at their inner adjacent longitudinally extending framing members, the form assemblies having first means for rolling movement longitudinally on the floor slab and second means for elevating, leveling and lowering the framing and superstructure of the form assemblies from and to the floor slab and for rolling movement of the assemblies transversely thereon toward and away from each other. An inner wall form and roof form are respectively movable and fixed components of each form assembly, the inner wall form being translatable laterally outwardly and inwardly with respect to the framing structure. A pivoting roof edge plate section is hingedly mounted to and at the lateral distal edge of the roof form.

Abstract: An ingot mold provided with means affording stress relief thereto for the ingot pouring operation, while maintaining the mold in condition to aid in preventing metal leakage therefrom during the ingot pouring operation and subsequent cooling of the ingot, and providing mold wall support for the ingot until its skin has sufficient structural integrity to support the molten interior of the ingot, and a mold which can be recycled for use in a faster manner as compared to heretofore utilized solid or one-piece type ingot molds. In certain embodiments, the mold is formed of a plurality of completely separate and individual side wall sections defining at least the side periphery of a mold cavity, together with coupling means connecting the wall sections together. The coupling means provide for expansion and contraction of the mold sections relative to one another during the pouring of molten metal into the mold, and the resultant heating and subsequent cooling thereof.

Abstract: What is disclosed is a method for making a foamed resin sheet from a body of hot foamable synthetic resin containing a blowing agent, which method comprises heating said foamable body to a temperature which initiates foaming, limiting lateral expansion of the resulting foam by contact with a limiting surface while permitting free expansion of the foam thickness, then limiting further expansion of the foam thickness by contact with a limiting surface, and then cooling the foam below the foaming temperature while maintaining said limitations on foam expansion in the lateral and thickness directions by contact with said limiting surfaces.

Abstract: A sectional ingot mold formed of a plurality of side wall sections which when assembled define at least the side periphery of a mold cavity, with means coacting on the side wall sections for coupling the wall sections together into an integral unitary ingot mold; said means, providing for automatic compensation for expansion and retraction of the mold assembly sections when molten metal is poured into the ingot mold by providing for expeditious expansion of the mold assembly sections with respect to one another while aiding in sealing the mold sections from leakage of molten metal during the pouring and cooling of the ingot in the mold. In certain embodiments, yieldable gasket material is disposed between the wall sections at their junctions for aiding in preventing leakage of molten metal from the ingot mold assembly during pouring and solidification of an ingot in the mold.

Abstract: A mold for blow molding synthetic plastic bottles and jugs wherein a depression is formed in the side of the container for volume regulating purposes. The mold incorporates an insert member within its side wall and cavity which is adjustably positionable with respect to its degree of extension into the mold cavity resulting in formation of a variable volume depression in the container wall. The mold inserts may take various forms and include means for locking the insert adjustment.

Abstract: A process for moulding a food product consisting of a plastic mass, such as ice cream, and firm elements, such as biscuits. A multiple-cavity mould open downwards is placed on a fixed platform, a base is arranged in the mould on a vertically displaceable support, the biscuits are arranged between the base and the cavities and the mould is fitted with ice cream while the base is lowered.

Abstract: An improved process and apparatus for producing rigid cellular materials comprising polyvinyl chloride, wherein the controlled expansion of embryonic blocks obtained by molding, is carried out in a single expansion box closed throughout the whole duration of the expansion treatment, in several stages including pre-heating, pre-expanding and final expansion to the final dimensions of the block, the expansion box containing the block expanded to its final dimensions being then immersed in a bath of cold water for dimensional stabilization.The expansion box comprises at least two plates, with a frame attached to the lower face of each plate, to form, in use, a closed expansion box which is provided with a centering and holding mechanism to maintain the embryonic block in place within the expansion box, a device for opening and closing the expansion box being also provided, as well as a mechanism for transferring a plurality of expansion boxes assembled together from one bath to the other in succession.

Abstract: A preform molding apparatus includes a mold cup which has opposed top and bottom mold members and a carrier arm between the mold members. The top mold member has a concave mold recess in its bottom surface and a semi-cylindrical rim extending downwardly from the edge of the mold recess. The bottom mold member has a concave mold recess in its top surface and a mold material inlet opening into the bottom of the mold recess. The carrier arm has a semi-cylindrical opening therethrough at one edge thereof. Pneumatic cylinders have piston rods connected to the mold members and the carrier arm for moving the mold members toward and away from each other and the carrier arm transversely across and away from the mold members.

Abstract: A process for fabricating articles from ultra high molecular weight (UHMW) polymer material is disclosed. The process comprises injecting melted UHMW polymer material into an evacuated compressible sectioned cavity mold and then compressing the sections of the mold to compensate for material shrinkage and to prevent internal laminations.

Abstract: A sectional ingot mold formed of a plurality of side wall sections which when assembled define at least the side periphery of a mold cavity, with means coacting on the side wall sections for coupling the wall sections together into an integral unitary ingot mold; said means, providing for automatic compensation for expansion and retraction of the mold assembly sections when molten metal is poured into the ingot mold by providing for expeditious expansion of the mold assembly sections with respect to one another while aiding in sealing the mold sections from leakage of molten metal during the pouring and cooling of the ingot in the mold. In certain embodiments, yieldable gasket material is disposed between the wall sections at their junctions for aiding in preventing leakage of molten metal from the ingot mold assembly during pouring and solidification of an ingot in the mold.

Abstract: A method and assembly for molding plastic optical lenses. The mold assembly comprises an annular retainer ring supporting a pair of generally disc shaped mold parts urged toward each other by a resilient force while separated by one or more gaskets, preferably including at least one soft gasket of uniform thickness between its inside and outside diameters which has the property of softening at elevated temperatures. When the cavity formed between the mold parts and bounded peripherally by the gaskets is filled with a resin formulation in the form of a liquid which then polymerizes when raised to an elevated curing temperature, shrinking and becoming hard and insoluble at room temperature, in the process the softening of the gasket permits the mold parts, under the action of the resilient force, to move towards each other to maintain contact with the formulation as it shrinks and hardens.

Abstract: A blow mold for producing bottles or similar hollow containers from parisons of synthetic plastic material comprises two mirror-symmetrically arranged blow mold halves movable toward and away from each other between a closed and an open position. Each of the mold halves includes an outer mold part and an inner mold part guided for independent movement relative to the outer mold part in an endless inner face of the latter, the inner mold part having a concave end face which forms together with an adjacent portion of said inner face of the corresponding outer mold part in the closed position of the mold half of the mold cavity for forming a bottle. Each of the concave end faces of the inner mold part may also be provided with an island-shaped sharp edged projection aligned with and engaging in the closed position of the mold a corresponding projection on the inner mold part of the other mold half for forming a grip opening in the bottle.

Abstract: A mold especially adapted for forming precast, waffle-shaped concrete panels employs a one-piece mold body of plastic sheet material to provide a reusable mold structure that may be rapidly stripped and reset. Each corner of the mold body is open; thus, the sides of the mold present pliable flaps due to the inherent flexibility of the sheet material and are swung outwardly after molding is completed in order to release the molded product. External reinforcing members on the sides maintain the same rigid and true during the molding process. The corners are held closed by simple locking devices which are readily released for stripping. Raised portions in the mold body form the characteristic voids in the molded waffle product, and are reinforced and rigidified by a foam filler.

Abstract: A mold is described for the molding of substantially isotropic isocyanate-based polymer foam buns. The mold is a box mold which has sidewalls of which at least one pair disposed in parallel relationship is adapted to move outwardly when subjected to pressure exerted by the expanding foam during the molding operation. The outward movement of the sidewalls is controlled by stops provided on the periphery of the mold floor, said sidewalls being free to slide over the surface of the floor. The lid of the mold is supported in sliding engagement with the upper edges of the sidewalls. The mold and the process of fabricating foam buns therewith is particularly suitable for use in situations (e.g. operation in the field) in which it is not possible or practicable to employ continuous bunstock machines. The mold is relatively inexpensive and readily dismantled for transportation to a fabrication site.

Abstract: An adjustable mold for casting asymmetric concrete highway divider sections includes a fixed sidewall, a movable sidewall, and two end walls. Each of the end walls is divided vertically into a first fixed panel and a second adjustable panel. The old can be set up to produce a barrier section that accommodates any difference in grade levels between the separated roadway lanes, within a preselected range, by adjusting the height of each second end panel relative to the adjacent first end panel and by adjusting the height of the movable sidewall to match the second end panels. All adjustments are made by means of simple jack screws. The end walls and the movable sidewall are mounted on hinged frames that can be swung open to facilitate removing a section casting from the mold.