Abstract: A method for manufacturing a sealing device to improve the positioning accuracy of a parting operation while also improving manufacturing efficiency. The method includes molding an elastomeric cylindrical molded body (100a) with a plurality of cylindrical surface portions (130) and a plurality of annular outer peripheral convex portions (110) arranged alternately on an outer peripheral side thereof, and further provided with a plurality of cylindrical surface portions and a plurality of annular inner peripheral convex portions arranged alternately on an inner peripheral side thereof. The cylindrical surface portions on the outer peripheral side and the cylindrical surface portions on the inner peripheral side, as well as the outer peripheral convex portions and the inner peripheral convex portions are provided so as to be at the same positions in the axial direction.

Abstract: A support structure for a membrane comprises a plurality of support members and at least one flange, including: (a) a first set of spoke-like support members that extend generally from at least one flange toward a common hub and that have a distal end joined to at least one flange and a proximal end joined to the common hub; and (b) at least one subsequent set of spoke-like support members that are distributed between circumferentially adjacent pairs of spoke-like support members from the prior sets and that extend generally from at least one flange toward the hub, each having a distal end joined to at least one flange and a proximal end connected to the nearest circumferentially adjacent pair of spoke-like support members from the prior sets via a pair of approximately straight anchoring support members which join together and form an angular joint at or near said proximal end, with the vertex of said angular joint pointing generally away from the hub.

Abstract: A fall protection permanently embedded safety anchor comprises a unitary housing having outwardly diverging side walls and an interior cavity. Opposed apertures in the side walls receive a uniformly curved retaining bar, the ends of which extend outside the cavity and are embedded in the concrete. The anchor may be easily installed stored and transported and installed in the field. The side walls terminate in an outwardly extending collar that receives a cover that is flush with the surrounding concrete surface.

Abstract: The invention provides a method of making a vessel having a sculptural interior, comprising attaching a textile core to the air inlet port of an I.S. machine, inserting a gob of molten glass into a mold to surround the textile core, applying compressed air to press the molten glass around the textile core, applying compressed air to inflate the textile core creating the bottle, allowing the bottle to cool sufficiently to withdraw the core from the bottle, and withdrawing the textile core from the bottle.

Abstract: A system for accelerated manufacturing of concrete modular housing units including a first deck platform including a plurality of exterior movable wall forms. A second deck platform including a plurality of exterior movable wall forms. A first concrete slab is placed on the first deck platform. At least one core including a plurality of core walls placed on the first concrete slab. The exterior movable wall forms of the first deck platform are positioned proximate the core walls to define a wall space there between configured to receive wet concrete and create a first concrete modular housing unit. A second concrete slab is placed on the second deck platform.

Abstract: A dynamic concrete form includes a sleeve defining a passage extending between first and second open ends. A first attachment feature extends outwardly in a first direction from the sleeve at the first open end and a second attachment feature extends outwardly in a second direction that is opposite the first direction at the second open end. In a first position, the passage has a first axial length, the first open end lies in a first plane, and the second open end lies in a second plane. In a second position, the passage has a second axial length that is greater than the first axial length, the first open end lies in the first plane or a first new plane that is parallel to the first plane, and the second open end lies in the second plane or a second new plane that is parallel to the second plane.

Abstract: A die for manufacturing CVJ boot by injection molding includes a central core, and a plurality of divisional molds for molding an inner peripheral surface of the CVJ boot, respectively. The divisional molds move diametrically toward the central core. Moreover, the divisional molds not only approach one another diametrically, but also get away from each other axially.

Abstract: An expandable molding insert apparatus and corresponding method are provided. The insert apparatus may be expandable between a first uncompressed position with a first diameter and a second compressed position with a second, larger diameter due to axial decompression and compression, respectively, of the insert apparatus. For example, the insert apparatus may include an inner rod, an outer jacket, and a compression member. The compression member may be configured to provide axial compression to the outer jacket, such that the outer jacket may be adjusted between a first uncompressed position with a first outer diameter and a second compressed position with a second, larger outer diameter. The insert apparatus of the present disclosure facilitates withdrawal of the insert apparatus from a molded component, requires a minimal number of mechanical components, and provides for ease of actuation when the insert apparatus is utilized during a molding process.

Abstract: A form and process for casting concrete blocks, each having at least one side textured. The blocks are cast in cavities which have a resilient insert on at least one side for imparting texture to the blocks. After the cast blocks are cured, the form is inverted and placed on a support surface. At least the side having the resilient insert is moved laterally away from the block and the form is lifted to leave the block on the support surface. The textured side can release from the form despite deep grooves and crevices simulating natural stones.

Abstract: The present invention relates to a liquid crystal device to which a line on glass structure and a cascade structure are both applied, and a manufacturing method thereof. The liquid crystal device includes: a liquid crystal panel including a plurality of pixels defined by gate lines and data lines that cross each other, wherein a first group of signal lines is formed on the liquid crystal panel in an on-glass-configuration; a plurality of tape carrier packages mounted with source drivers that provide data signals through the data lines to the liquid crystal panel and mounted on the liquid crystal panel in a cascade structure, wherein a second group of signal lines connected to the first group of signal lines is formed thereon; and a printed circuit board combined directly with only one of the plurality of tape carrier packages so as to supply a plurality of driving signals and control signals to the liquid crystal panel.

Abstract: Device for introducing a coating into pipes and pipe bends and, more generally, into rotationally symmetrical bodies open at only at least one end, with an elastic, elongate, inflatable core (12), the so-called “variocore”.

Abstract: A concrete casting sliding corner system includes a pallet for defining the cross-sectional shape and thickness of the sidewalls and an inside core mold disposed interiorly of the pallet and an outside mold jacket disposed outwardly of the pallet. The mold core and mold jacket are movable between an open release position and a closed casting position. A corner forming section includes a wedge-shaped member movable vertically between an upward casting position and a downward release position. Alignment means is included to coordinate the corner wedge and members of the mold core to prevent misalignment due to lack of coordination between the interior mold components.

Abstract: A collapsible corner assembly is used in a collapsible form assembly to form a hollow structure, such as a four or five sided hollow concrete structure. One embodiment of the form assembly includes two collapsible corner assemblies, two fixed corner assemblies, and intermediate panels coupled to the corner assemblies. Each collapsible corner assembly preferably includes collapsible side portions and retractable members forming outer corner forming surfaces. To collapse the collapsible corner assembly, the retractable members are retracted and the collapsible side portions are moved inwardly. Collapsing the collapsible corner assemblies allows the form assembly to be removed from the hollow structure.

Abstract: The present invention is directed to a multi-part form, for use in forming an inner wall of a mold. The multi-part form includes a consumable exterior wall for contacting a casting compound. A collapsible intermediate wall contacts an inner side of the exterior wall and an interior wall is slidably engaged with the intermediate wall. The present invention is also directed to a method of forming a containment member for molten metal. A mold having an inner wall is provided. The inner wall includes a consumable exterior wall for contacting a casting compound, a collapsible intermediate wall that contacts an inner side of the exterior wall and an interior wall that is slidably engaged with the intermediate wall. Also provided is an outer wall that substantially surrounds the inner wall and defines a space between the outer wall and the inner wall. Casting compound is poured into the space and the casting compound is allowed to set.

Abstract: A wedge apparatus for use with molds and a mold utilizing at least one wedge apparatus. The wedge apparatus includes a pair of attachment portions, each having an attachment surface and a wedge surface, a wedge portion, and a shaft. The wedge portion is slidably attached to the attachment portions and has a center portion terminating in a pair of center edges disposed at opposite angles to the wedge edges such that the center surface and the wedge surfaces form a substantially continuous mold surface. The shaft is attached to the center portion and extends through an opening through a cross member to maintain the center edges of the wedge portion in alignment with the wedge edges of the attachment portions.

Abstract: A mold system for casting five-sided, monolithic, seamless concrete products comprises an outside jacket, an inside mold core complete with base, and a movable pallet to aid stripping. The outside jacket preferably includes two L-shaped panel members arranged in a rectangular configuration which are supported for movement between open and closed positions by a pair of base-mounted corner actuators extending from the fixed base to the apex of each panel member. The panel members are also linked to one another by a series of actuators along each of the adjoining two corners of the jacket. The inside core includes four interior panels linked by four inside retractable corners. A minimum of two series of actuators also span the middle portion of the inside core. These middle actuators in conjunction with the actuators in the corner devices function to expand and contract the entire inside mold core. A plurality of base supported actuators are fastened to the inside core.

Abstract: A collapsible core for concrete pipe making machines that are used in the dry cast process when lined pipe are to be produced. The collapsible core of the invention has a moveable front panel joined to two moveable side panels, all of the panels being connected to hydraulically powered linkage arrangements that will pull the panels straight back from the liner. The collapsible core is constructed so that when moveable panels of the core are retracted to collapse the core, the core panels are guided along radial lines of the core to pull the panels directly away from the pipe liner, thus practically eliminating the friction that causes bulging or pull out of the liner from the concrete pipe.

Abstract: A gated mold for casting concrete pipe requires no wedges or bolts for securement. A core mold may be contracted by lifting at an actuation point, and expanded by resting on a base ring. An external mold may be expanded by lifting at an actuation point, and contracted by resting on a base ring. The mold gates are opened and closed with sets of collapsing links pivotably attached to a longitudinally extending actuation column. Longitudinal motion of the actuation column forces the links to collapse or extend, thereby expanding or contracting the mold. Appropriately positioned actuation and lifting points are provided such that the mold can be lifted vertically along the longitudinal axis containing the mold center of gravity.

Abstract: A molded article having a large undercut part is efficiently produced by a method of molding a synthetic resin with the use of an apparatus comprising an outer mold (S) and an inner mold (N) arranged so as to form a cavity (C) inside the outer mold (S), said inner mold (N) comprising a central mold segment having a part whose size is reduced toward its head and mold segments (6, 7) for forming an inner surface of a molded article which are supported so as to be able to meet and get apart from each other around the central mold segment (4) and divided into a plurality of separate segments, wherein said mold segments for forming the inner surface of the molded article are rendered movable toward the center of the apparatus by moving the central mold segment and wherein the inner mold (N) is withdrawn in the form of its size reduced as a whole from inside the molded article (21) supported in the outer mold (S).

Abstract: The mold wall forms the boundary of a cavity provided with a filling opening and is divided vertically into several segments, which are connected to each other in such a way that they can separate under the action of a force acting outward from the cavity. At least one pretensioned elastic element is installed outside the cavity, which is in effective contact with at least one segment, so that, because of the pretension, an elastic force acts on the segment in the direction toward the cavity. A tensioning element is provided to pretension the elastic element, this tensioning element being installed outside the mold wall to serve as an abutment for the elastic element, and that the elastic element be made of a creep-resistant material.

Abstract: A thermal aircraft, such as a hot air load-carrying balloon which includes a balloon envelope having a deflation aperture therein and a venting valve or operculum designed to removably cover and seal the aperture and to be opened and/or closed rapidly so as to assist in the control of the balloon, forming both a deflation panel and a maneuvering port for the balloon. The venting valve is removably and releasably secured to the balloon envelope adjacent the periphery of the aperture, and means are provided for controllably and selectively positioning the valve in the aperture for open and closed dispositions thereof. Separate controls are provided firstly to extend the valve to its maximum surface area, at which point it removably covers and seals the aperture and/or to allow controlled venting of hot air therefrom, and secondly to allow reefing of the valve from the aperture for rapid deflation of the envelope.

Abstract: A system of mounting a plurality of wall panels to a soffit layout which defines the building module's layout, utilizes exterior and interior wall panels which are hingedly mounted at the bottom and are actively displaced to permit the casting to be removed. The panels are movable through the use of manual or hydraulic actuators. When the interior panels are positioned to receive the mold material they are exactly vertical. To permit the creation of orthogonal corners, the invention employs a trapezoidal corner panel for use in each interior corner. This corner panel is movable independently of the wall panels although it fits in precise confronting relation with specially designed terminal sections of the wall panels. A spacer or filler segment is also utilized above each interior wall panel and outwardly of the marginal roof panels with the filler segment defining a horizontal junction for the casting wall and roof.

Abstract: An apparatus is used to support and move vertically an erected form assembly during the construction of a building with a plurality of stories. The stories include a lower story and an upper story. Each of the lower and upper stories is formed previously with a concrete wall structure that has surrounding walls formed integrally with reinforced horizontal beams which confine an interior space. The apparatus includes a form support body that can extend across the interior space of the upper story and that has a top side on which the erected form assembly can rest. A plurality of legs extend downwardly from the form support body. Each leg has a lower portion associated with a clamping unit in order to fix releasably the leg to one of the reinforced horizontal beams of the lower story. A horizontal support bar is located below and is spaced from the form support body.

Abstract: The formwork assembly (10) is used to cast tubular or part-tubular structures, one particular application being in the lining of mine ore passes with a concrete lining (54). The assembly includes an internal framework (12, 14, 32; 100, 102, 104) and external, flexible formwork (34, 130) supported by the framework. The framework can be adjusted between a casting condition (FIG. 1) in which it supports the formwork (34, 130) at the inner periphery of the structure which is to be cast and an inwardly collapsed condition in which it supports the formwork (34, 130) at a position spaced inwardly from such inner periphery. In the case of a mine ore pass lining, the assembly is moved upwardly in increments after each casting operation.

Abstract: A compressible band and end retainer assembly which secures opposite ends of a band to an intermediate spacer. The band mounts between facing concrete sidewall forms to define a hole, upon pouring and curing a slurry of surrounding concrete. Various band geometries permit hole formation in planar or curvilinear poured walls.

Abstract: A method for assembly and disassembly of formwork for walls (1) of poured material raised above a reference surface (2) using boards (3) each including a shuttering face (4) and equipped with wheels (31, 32) at their base. Assembly includes from an unshuttered position, rocking toward the wall (1) to be shuttered of at least the base (29) of the shuttering face (4) of the board (3) by rotating about an axis defined substantially by the support points (10) of the wheels (31) on the reference surface until the lower edge (35) of the shuttering face (4) is made to rest on the reference surface (2). The rocking is continued toward the wall (1) to be shuttered of at least the base (29) of the shuttering face of the board (3) by rotating about an axis substantially defined by the lower edge (35) of the shuttering face of the board (3) until the wheels (31) are raised from the reference surface. For disassembly, the rocking about the two axes is performed in reverse.

Abstract: A lightweight metal or plastic form that when collapsed can be installed on the inside of a temporarily suspended manhole casting and expanded by a mechanism having numerous arms connected at a center point and extending outwardly to spaced and positioned spring encasing brackets that compensate and adjust slightly the pressure that the arms project to the outer walls of a slotted circular shaped form. By a cam effect the handle locks into a over center position that is maintained without the aid of clamps or additional hardware so that the form will stay in position until the user lifts the handle upwardly which removes the device from the manhole and at the same time collapses the form. The inventions primary purpose is to provide a seal between a temporarily blocked up manhole metal casting and the manhole precast concrete riser rings so that cement may be applied around the outside of the manhole and vibrated into position without danger of any cement contaminating or plugging the sewer system.

Abstract: Disclosed is a collapsible plug which is insertable into the interior section of an appliance cabinet and expandable therein to simultaneously extend the plurality of panels to provide lateral shoring support to each of the interior surfaces of the cabinet so as to prevent bulging thereof during the injection and curing of insulating foam in the cavity between the interior surfaces and external surfaces of the cabinet, and collapsible so that the plug can be inserted into and removed from the cabinet interior without contacting the interior surfaces during insertion nor removal. Particularly, the disclosed design allows different thicknesses of tooling panels having surfaces complementary to the interior surface of the cabinet to be employed without concern for contact between adjacent panels upon their retraction due to the additional thickness.

Abstract: A U-shaped, half-room precast concrete building unit is molded in an open box-like framework having four L-shaped corner assemblies, facing pairs of horizontal legs of which are respectively joined by laterally-extending telescoping spacers, and facing pairs of vertical legs of which are respectively each joined by two laterally-spaced longitudinally-extending plates. Inserts having alternating voids and blocks are placed longitudinally between the vertical leg pairs to form complementary block and void patterns on the molded unit juncture edges. Retainers having projections are placed over the top edges of the plates to form complementary tongue and groove portions. Relative dimensions of the molded unit are selectable through adjustment of the relative positionings of the corner assemblies.

Abstract: An apparatus for forming voids in concrete including baseplates secured to a wood supporting deck or form for a concrete floor by a plurality of short wood screws. An adjustable sleeve assembly is attached to each baseplate and is adjustable to a height generally equal to the thickness of the floor with the upper end of the sleeve being accessible and observable when concrete is poured. After the baseplates have been secured in place, various subsequent work procedures may be carried out without the workers encountering obstructions that would exist if upwardly projecting cavity forming members where attached to the wood deck and the sleeve assemblies are mounted prior to pouring the concrete. After the concrete has been poured and set, the sleeve assemblies and the baseplates are removed by unscrewing the sleeve assemblies, removing an upper sleeve and pulling a lower sleeve and baseplate up from the wood deck.

Abstract: An apparatus for making concrete pipe having vinyl liners. An expandable core is used to hold a tubular vinyl liner. The core has over-center latches which lock the core in an expanded position to hold the liner against the outside surface of the core. The core is a flexible and expandable shell which can be deformed by a forming module into an exact desired shape prior to placing concrete arount the liner and the core. The liner and core are inserted along with a reinforcing cage into a dry-cast concrete form. Then the form is placed over the module and the module is actuated into engagement with the inside surface of the core. The module has a series of disc assemblies, each of which has a plurality of radially moveable shoes capable of being moved to expanded and retracted positions. The form is filled and immediately taken off the module.

Abstract: Molding apparatus, for example for molding components of polymerized resin without drawing, comprises a mold defined by a mold wall having a first thermal expansion coefficient, and a die including a die wall having a second thermal expansion coefficient greater than the said first coefficient, a molding operation being carried out by inserting the die into the mold at a first temperature, heating the die and the mold to a second temperature higher than the first temperature, and subsequently cooling the die and the mold after a component has been molded. In accordance with the invention, the die wall includes a plurality of separate sectors which are pivotally mounted on a common support member and which are arranged and dimensioned such that, at the second temperature, the radially outer faces of the sectors adjoin one another contiguously to define the molding face of the die wall.

Abstract: An inner mold construction and an outer mold construction are provided to define a mold cavity or shape into which wet or uncured concrete is introduced. The method includes the sequential steps of compressing the concrete by movement of the inner mold relatively toward the outer mold to remove surplus liquid from the inner surface of the concrete so that the concrete is at least partially cured. The compression applied on the inner surface of the concrete by the inner mold is maintained while inward pressure is applied over the outer surface of the concrete by the outer mold to remove surplus surface liquid from the outer surface of the concrete. The inner and outer surface pressures on the concrete are released to release the molded article from the mold so that it may be separated therefrom.

Abstract: Apparatus and method for forming a three dimensional injection molded article having a pair of passageways extending therethrough and with a locking indentation in each passageway using first and second mold parts each having open ended cavities having an end wall and a plurality of sidewalls formed therein wherein a pair of fixed arms are mounted on the end wall of the first mold part so that they are spaced from each other and each of the sidewalls, have portions extending out of the open ended cavity and have contoured surfaces and wherein a pair of movable arms are mounted on the end wall of the second mold part for rotation about fixed axes and are spaced from each other and from each of the sidewalls and wherein each movable arm has a contoured surface adapted to be moved into a continuous contacting relationship with the contoured surface of one of the fixed arms and when in the contacting relationship to provide protruding portions to form said locking indentations.

Abstract: A sintering device includes separable mould walls which together define a mould cavity and a mould core which is positioned within the cavity to define an undercut mould surface. The core includes a hollow frusto-pyramidal central support formed with guideways and a plurality of core segments mounted for slidable movement within the guideways whereby the core is radially expandable and contractable. The segments include a plurality of arc-surface segments alternating with trapezoidal segments. The mould walls and the core include passages for introducing steam and air into the cavity. The passages of the core place the hollow interior of the central support in communication with the mould cavity.

Abstract: A molding machine for casting a concrete product includes a stationary support system, a rotatable apparatus and a pair of bearings supporting the rotatable apparatus on the stationary support system. The rotatable apparatus rotates 180 degrees between an upward position and a downward position. The rotatable apparatus includes a mold having a configuration form, exterior wall-forming panel, interior wall-forming panels, and interior corner-forming panels, all of which hang from corresponding trolleys which ride on corresponding rails to form the walls of the concrete product when all of the panels are against the product's configuration form. Further included is a floor panel which cooperates with the interior wall-forming panels and the interior corner-forming panels and is supported thereon by an internal structure. The floor panel, the interior wall-forming panels, and interior corner-forming panels are positioned below the exterior wall-forming panels and spaced therefrom to contain the concrete therein.

Abstract: Cylinder block molding apparatus includes two series of parallel and alternate molding plates for partitions. The plates extend in planes perpendicular to the axis of an engine shaft. Each series of molding plates is mounted, respectively, on a support capable of sliding parallel to the axis of the engine shaft relative to the cylinder block between a molding position where mutually confronting molding faces of two consecutive plates bear against one another and a lifting position where the molding faces are moved apart as a result of sliding of the supports.

Abstract: An injection mold having a pair of stationary and movable molding plates, a plurality of sidewalls moved by one or more hydraulic cylinder assemblies disposed between the stationary and movable molding plates through inclined guide pins or guide blocks, a core member provided with a slanting surface and secured to the movable molding plate inside the sidewalls, and slide core members being movable in engagement with the core member. The respective sidewalls, and the sidewalls and the slide core members are connected by a connecting mechanism including link plates and connection plates so that the sidewalls and the slide core members are substantially simultaneously moved by at least one of the hydraulic cylinder assembly.

Abstract: The invention relates to a sliding shuttering system for producing concrete structure walls, particularly for conical and/or sloping reinforced concrete structures with annularly closed, varying cross-sections. Especially in the case of sloping structures with upwardly diverging wall regions, the hitherto known sliding shuttering systems can only be used to a limited extent with regards stability and security. In order to be able to perform a sliding process even in the case of extreme structure configurations, the support is made rigid and is mounted on angularly adjustable piles, at least one of the pairwise associated piles being fixed to the support to prevent horizontal shifting.

Abstract: The invention relates to a sliding process for producing concrete structure walls and a sliding shuttering means for erecting or installing monolithic block brackets, praticularly in the case of annular structures. In order to permit a continuous installation of block brackets in the case of a favorable force transfer between the structure wall and the sliding shuttering, the invention provides for the integration into the sliding shuttering of shuttering forms which are substantially complimentary to the block brackets to be installed. In height regions without block brackets, the shuttering form is terminated in aligned manner on the wall side of the structure and is opened on reaching the height level of the block bracket to be installed. After providing the block bracket, on raising the sliding shuttering, the shuttering form is again closed at the top height level of the block bracket.

Abstract: The invention relates to a collapsible core for a mould. The core comprises three relatively movable assemblies. The first assembly carries a cone, the second assembly carries an inner set of segments which form part of the core surface and engage the cone and the third assembly carries outer segments moved by inclined pins on the second assembly. As the assemblies are moved together the outer segments move radially outwards and the inner segments move axially in between them. Then the inner segments move radially outwards and the cone fills the center of the core. On reversal of the movement, the core is collapsed to enable it to be withdrawn from the moulded article.

Abstract: A mold, typically an injection mold, comprises a cavity member and a core member relatively movable between open and closed positions to define a first parting line and a molding chamber between the core and cavity members in the closed position. A sprue aperture is provided, communicating with the molding chamber to provide molding compound to the chamber. In accordance with this invention the cavity member defines forward and rearward portions movable between open and closed positions and proportioned whereby objects molded in the molding chamber can be removed from between the forward and rear portions when the cavity member is in its open position.

Abstract: An injection molding system is provided with a plurality of wall segments which are displaceable substantially radially for forming a substantially continuous wall which forms an internal wall of a hollow region which is intended to be filled with molten molding material. In a preferred embodiment, the wall segments are urged into sliding communication with one another and sealable engagement with a further wall portion by operation of an actuator assembly which is provided with canted pins which cause the wall segments to be moved radially inwardly and outwardly in response to orthogonal displacement of the actuator assembly. The invention is therefore particularly suited for forming molded articles having hollow interiors and/or internally ribbed portions. In an embodiment where a slot is desired in the molded article, a slot core is arranged to communicate with the molten molding material, so as to form the slot, and an ejection mechanism.

Abstract: A structural component having a curved wall, such as an aircraft fuselage pipe, has a grid structure formed of box frames produced by winding tapes of fiber reinforced synthetic material, so-called prepregs, onto mold bodies. These mold bodies are then assembled on a mandrel for covering with a planking and curing whereby the tapes are bonded together to form stringers intersecting with ribs in a grid structure and whereby the planking is bonded to the grid structure. The ribs are reinforced by fiber reinforced belt segments of synthetic material inserted into gaps between adjacent short ends of the mold bodies, whereby these belt segments are bonded to the ribs during curing. The belt segments ave a width corresponding to a multiple of the width of the stringers and hence protrude radially inwardly. Preferably, an edge reinforcing strip of fiber reinforced material is arranged alongside the radially inner edge of the belt segments.

Abstract: A mould which is used for the production by injection moulding of fittings which have an inner annular groove includes a divisible outer mould, a mould core and a mould ring. The mould core has a plurality of segments which can be folded together. In order to ensure with absolute reliability that the fitting does not remain clinging to the mould ring during removal of the fitting from the mould, the mould ring is connected to the mould core and is withdrawn together with the mould core from the fitting.

Abstract: An improved sheathing for use as a covering on a polygonal container having a plurality of adjustable support members for supporting the sheathing thereon. The sheathing comprises at least two adjacent pivotally connected panels having a vertical joint therebetween formed by an offset edge of one panel overlying an adjacent edge of the other panel. The panels include a mechanism for adjusting the angle between the panels comprising a pair of pivotally connected plates, each of the plates being pivotally connected to a respective one of the panels, and an adjusting screw threadedly mounted to the plates and extending towards the joint.

Abstract: An apparatus for forming a multisided upright concrete wall with inner and outer form set-ups including an arrangement for stripping said inner form set-up which has a multisided form wall from the cast concrete entirely which comprises at least one wedge means dividing at least one side of the form wall into two portions and wedged in between the two portions in a first direction during casting, and means for moving the wedge means in a second direction opposite to the first direction after casting and bringing the two portions to be nearer relative to one another, whereby the inner form set-up contracts and therefore entirely is spaced apart from the cast concrete.

Abstract: A molding device includes a multi-sided contractible inner form and outer forms that can be connected detachably to the inner form. The inner form has, at each side, a wedge-shaped spacer formwork board, on which are mounted a power means and a linkage mechanism, disposed between and connected detachably to left and right component formwork boards. The wedge-shaped spacer boards in all sides of the inner form can be pulled inward by individual power means through individual linkage mechanisms to leave space for the left and right component formwork boards to approach one another at all sides to contract the entire inner form.

Abstract: A molding apparatus for molding in place walls of a structure on a poured concrete floor or other base is provided with a central support member to which are movably attached four flat wall molds and four corner molds which cooperate with adjacent like apparatus and also with conventional exterior molds in forming a cast structure; the apparatus has actuating members for effecting retraction firstly of the flat wall molds and then of the corner molds toward the central support member upon completion of a casting operation and after hardening of the cast materials; the flat wall and corner molds are connected to the central support member by means of a plurality of lost motion connectors in such a manner that the aforementioned retraction is accomplished, after disengagement of locking devices, first by the flat wall molds and then, after a selected delay, by the corner molds; then, while in this position, the apparatus is removed and transported to another location where it will be set in its place in an expa

Abstract: An injection mold utilizes a collapsible core portion which includes a core portion and a mold cavity portion. A core base is provided as part of the core portion. A first mold ring is positioned about the core base and longitudinally movable to define a first annular parting line between the core base and first mold ring. The first mold ring carries outer core members and controls their longitudinal positioning along the core base while permitting them to move radially inwardly and outwardly between molding and collapsed positions. A second mold ring is carried on the core and includes stripper ring means, the second mold ring being longitudinally movable to define a second annular parting line with the first mold ring. The second mold ring also forms a third, annular parting line with the mold cavity portion. Means are provided for relatively moving the core base, mold cavity portion, and first and second mold rings in a longitudinal direction relative to each other and the mold cavity portion.