Abstract: A system for making sand molds each having associated therewith a core member composed of a core element or a network of core elements is disclosed. The system includes a machine for making and depositing onto a conveyor, mold sections having joint faces in engagement to form a string of closed-up mold sections. Each mold section has a mold cavity defined in its joint face. A core making machine is positioned adjacent the string of closed-up mold sections and include at least two core box sections, each having a joint face and being arranged for mating of their joint faces for molding a core member therebetween. One of the core box sections retains the mold core member when the faces of the core box sections are parted. The core box section is placed into an orientation such that its joint face is parallel with the exposed face of the last mold section. A core mask is provided for fetching the core member from the core box section and transferring the core member to the last mold section.

Abstract: A casting mould consisting of closely collected uniform mould parts is advanced stepwise on a conveyor path by a main piston, exerting an endwise pressure on the endmost mould part, and by an auxiliary mould advancing device incorporating a hydraulic cylinder, the piston of which is greater than said main piston. Hydraulic fluid displaced by the main piston is supplied to the hydraulic cylinder together with additional hydraulic fluid admitted through a differential pressure valve responding on the pressure difference between the two sides of the main piston.

Abstract: In a casting apparatus using a mould which comprises a horizontal series of identical mould parts and presents at least one casting cavity at each joint between successive mould parts, the mould is advanced stepwise through a pouring station with a length of step that equals a multiple of the thickness or axial length of each mould part.

Abstract: A method of inserting a core in a sand mold wherein the sand mold is provided with a cavity for receiving the core, and, during the insertion of the core in the cavity, the sand around the core is compressed by an element or, if the core print is provided with a retaining projection, a further projection on the core print is provided for compressing the sand around the cavity in the sand mold which receives the retaining projection.

Abstract: In an apparatus including a single pressure chamber for successively producing identical mould parts to be stacked closely together on a guideway, at least one carrier frame is provided for the transfer of the mould parts from the pressure chamber to the guideway.

Abstract: In a casting apparatus using a mould which comprises a horizontal series of identical mould parts and presents at least one casting cavity at each joint between successive mould parts, the mould is advanced stepwise through a pouring station including a pouring sow, the bottom of which rests on the top surface of the mould and has at least one outlet to successively communicate with the inlets of the casting cavities of the mould during the stepwise advance thereof.

Abstract: A fluid flow control valve having a valve member which is urged away from a cooperating seat by the combined pressures at the valve inlet and outlet and urged towards the seat by fluid pressure prevailing in a chamber which is connected to the valve inlet or outlet, respectively, dependent upon whether an order signal requires the valve to close or to open. Connection between said chamber and the valve inlet and outlet is controlled by an auxiliary valve which in turn is actuated through pressure transmitting lines connected to the inlet and outlet via a switch valve actuated by the order signal.

Abstract: In a casting apparatus using a mould which comprises a horizontal series of identical mould parts and presents at least one casting cavity at each joint between successive mould parts, the mould is advanced stepwise on a guideway including a driving section having a reciprocating support plate with apertures to periodically supply compressed air to reduce the friction between the plate and the mould sufficiently to neutralize the driving effect of the plate.

Abstract: In an automatic mold part producing apparatus having a mold chamber which is filled with mold forming material that subsequently is compressed between a pair of opposite end walls, the mold forming material is forced into said mold chamber by means of pressurized air, the pressure of which is gradually or stepwise increased during the chamber filling operation, for the purpose of achieving uniform compactness or density of the mold forming material throughout the height of the mold chamber.

Abstract: A foundry equipment comprises at least one guiding track element on which a number of identical mould parts are successively piled together in a position in which their greatest dimension is horizontal. After the formation of the mould, the guiding track element with the mould thereon is tilted about 90.degree. around a horizontal axis that is parallel to the longitudinal direction of the mould, thus bringing the mould into a position in which it is ready for the pouring operation.

Abstract: For the purpose of separating castings from the sand or similar material forming a string of moulds, each of the castings proper together with a lump of heat damaged mould material totally surrounding the castings is separated from the mould string. After having been subjected to an appropriate degree of cooling, the castings are separated from the lump material which, after sufficient regeneration, may be re-used together with the non-damaged material of the moulds.