Abstract: An annular member is integrally positioned within a core portion so that a side surface of the annular portion coacts with the outer surface of the core portion to form a substantially smooth and continuous outer surface of a core. A substantially inextensible portion of the annular member is joined in end-to-end relation to an elastomer portion of the annular member. An axial end portion of the elastomer portion is mechanically locked to the core portion.

Abstract: The invention relates to a formwork component for use in concrete construction for the formation of a recess in a wall or ceiling, the component comprising a hollow body defining a central axis, the body having a resilient wall and at least one spreader mechanism adapted to adjust the shape of the hollow body to vary its cross-sectional dimensions. In a first aspect the resilient wall includes at least one section bendable about an axis substantially co-planar with the central axis. The spreader mechanism may include at least one movable spreader component adapted to act on the resilient wall as a hinged lever.

Abstract: A mandrel assembly for vulcanizing an elastomeric vent tube within the bore of a larger elastomeric filler neck hose having a complex, multi-curved configuration comprises an elastomeric flexible vent tube mandrel and a metallic filler neck mandrel having a groove oriented longitudinally along the curved surface of a depth for receiving a mandrel mounted vent tube therein such that a portion of the tube outside surface is in intimate contact with the bore surface of the filler neck hose when it is mounted on the filler neck mandrel. Upon vulcanization, the elastomeric mandrel is pulled out the vent tube and the filler neck hose is pulled off the filler neck mandrel with the vent tube being integrally joined to the filler neck hose bore at their contacting surfaces.

Abstract: Disclosed is a device for forming apertures in cement or similar hardenable, plastic materials. The device, intended for use where holes of several inches in length are desired, comprises a body portion having affixed therein a threaded nut or coil. The body portion may be, for example, cylindrical in shape and be a solid elastomeric material having an aperture which extends axially through the body portion and communicates with a nut. The nut should be located adjacent the topmost portion of the body portion. A threaded rod may be inserted in the body aperture and screwed into the nut. A U-shaped bracket is provided which is placed on the hardened cement with the legs of the U-shape disposed on either side of body member. The joining member (which completes the U-shape) is spaced above and from the body portion by the legs. The joining member has a slot for receiving the bolt. The device is removed by threading a nut on the bolt down upon the joining member of the bracket.

Abstract: A mold for forming joints between a pair of pipes, such as sewer pipes extending into a man hole, where the mold includes a pair of mold parts extendable into the interiors of the pipes and having on first ends interengagable means for joining the mold parts together at one angular orientation and having on second ends interengagable means for joining the mold parts together at a different angular orientation so that one set of mold parts may be used to form joints between pairs of pipes in either of two orientations.

Abstract: A gate for opening and closing a longitudinal joint of a core used in casting concrete pipe has a pair of hinge plates pivotally connected to each side of the core adjacent the joint. A pair of over-center links pivotally connect to the hinge plates and to a pair of coordinator links. The coordinator links pivotally connect, as well, to a displaceable one of the core sides. A remotely controlled actuator acting between the hinge plates and the over-center links opens and closes the gate. The pivotal connections of the coordinator links to the displaceable side of the core, the coordinator links to the over-center links, and the over-center links to the hinge plates are such that in a closed position with both sides of the core abutting and with opening rotation of the over-center links about their pivot with the hinge plates, the pivot between the over-center links and the coordinator links during opening first passes through center before moving away from the joint.

Abstract: An article expanded at the center portion and having the maximum diameter at said portion, for example a ball-shaped flexible tube joint, is produced by using a mold consisting of a main mold having the same inner surface as the outer shape of said article, a cover mold provided with an elastic core having the same outer shape as the inner shape of the above described article and provided with a hollow cavity in the inside of the core, and a bottom mold provided with a projection, which detachably fits in the hollow cavity in the core, the main mold being put between the cover mold and the bottom mold, and a cavity having the same shape as the article to be molded being formed by the cover mold, the elastic core, the main mold and the bottom mold, and by pouring a liquid elastomer into the thus formed cavity and hardening said liquid elastomer.

Abstract: A plug assembly, for temporary use with a concrete product insert having a coil defining an interior threaded surface, holds the insert in position adjacent a mold wall and prevents the interior of the coil from being filled with concrete. The plug assembly includes a plug having a hollow cylindrical elastomeric body defining a cavity which is open at one end of the body and a stem in the cavity attached to the body internally and extending out of the cavity a distance sufficient to provide for use of the stem as a handle. The outer surface of the cylindrical, elastomeric body is proportioned and threaded for firm matching engagement with the threaded coil interior surface upon predetermined radial compression and axial expansion of the body from its substantially unstressed condition. A support means has a first portion for insertion into the cavity in the elastomeric body and a second portion for attachment to a mold wall.

Abstract: A casting or injection mold for vehicle tires comprises two separable half-shells together defining an annular cavity into which a segmented core is introduced, radially inwardly converging core segments alternating with parallel-sided or radially inwardly diverging core segments to facilitate extraction of the core from the molded tire. In operation, one or more of the non-converging segments are immobilized within the mold, with the aid of mating formations on these segments and on the two half-shells, while the converging segments are urged radially inwardly by resilient or fluidic forces. In a specific embodiment these forces are supplied by a contractile annular spring with projections received in axially extending undercuts of all the segments.

Abstract: A form assembly which may be used to provide a core portion in a concrete or other cast structure. A pair of former elements having interfitting hooks and flanges which are normally urged apart by a resilient sleeve which fits over the former elements. The sleeve biases the former elements to a collapsed position in which they may be inserted and removed. An inflatable tube is interposed between the former elements and may be inflated to move the elements to an expanded position wherein forming surfaces of the elements cooperate to provide a core about which concrete or the like may be poured.

Abstract: Process for sealing a block formed of a piling of spaced plates while preserving passageways between several plates and on at least one edge of the block, comprising inserting into the intervals between said plates the teeth of a comb adapted to substantially fill these intervals, casting a solidifiable material on said edge and withdrawing the comb after the casting operation, said teeth being made of a non-adhesive material with respect to the solidifiable material of the casting. This process and the resulting sealed blocks are particularly useful in the field of fuel cells.

Abstract: A portable apparatus for forming individual or multiple reinforced concrete, hollow core units of a modular building structure in interconnected side by side and/or high rise relationship which apparatus may be sufficiently collapsed to allow for easy removal from the formed and cured hollow core unit to again be used to form additional subsequent, interconnected, hollow core units of the building structure.

Abstract: A method for forming casting molds, comprising forming a flexible pattern composed of rigid plates and a flexible cloth, the rigid plates being adhered to the flexible cloth with intervals between plates, and the flexible pattern being made an air-tight construction, pouring a fluid into the flexible pattern or supplying the fluid under pressure to form any desired shape thereof, discharging the fluid from the flexible pattern after a sand mold has been cured, and then withdrawing the flexible pattern from the sand mold.

Abstract: A tunnel-like formwork comprising two side shuttering panels connected together at their upper edges by a flexible upper shuttering panel. The side shuttering panels are provided with wheels. Inside of the said formwork, a framework structure is disposed, comprising at least four upright members to the upper ends of which four arms are hingedly connected, the said arms being in turn hingedly connected at their lower sides to one end of four inclined struts elements the other end of which is slidingly guided into a slide guide formed in the said upright members. The said upright members are provided at their lower ends with retractable bearing feet.

Abstract: A core member used in a moulding flask for making prefabricated concrete products, comprising a hollow tubular member of predetermined size having all outer surfaces intended to be in contact with concrete mixture covered by a thin layer of rubber plate.

Abstract: A reusable cylindrically shaped, pivotally collapsible, foam mandrel used for the manufacture of hollow resin impregnated fiber tubes. The mandrel includes a substantially rigid foam cylindrical member, an extractable bar, and a means on the outer surface of the foam member for aiding in collapsing the cylindrical member, such as a groove. In one embodiment a hinge member is employed to further aid in the pivotal collapsibility of the foam cylindrical member.

Abstract: There is disclosed a method and apparatus for providing optically pure glass blanks, tubing, crucibles and the like for use in forming optical waveguides, lenses, prisms, filters, lamp envelopes and the like. A glass layer is formed at a high temperature on a mandrel which includes a support rod or tube upon which is disposed a layer of refractory metal wire, gauze, foil or the like. The mandrel is so constructed that stresses, which heretofore have developed in the glass layer during cooling, are avoided, and the mandrel is easily removed from the glass layer, thereby forming a hollow glass cylinder that is free from cracks, checks and the like.