Mold for forming parts of complex shape of injectable or thermosetting plastic material

Claim 1

A mould for the casting of parts of complex shape, having a central hub and multiple plane elements perpendicular to said hub, and parallel to each other, and spaced one from the other, of the same type as block cams, of thermo-plastic or injectable heat-hardening material; and for the automatic ejection of these parts during the opening of the mould, which can be used on an automatic moulding press; said mould having a movable part and a stationary part, first series of moulding slides mounted in the stationary part on two initial slide blocks movably arranged in opposite directions perpendicular to the movement of opening of the mould, and serving to define the intervals between the pieces of the moulded part, and a second series of moulding slides mounted in the stationary part onto two second slide blocks movably arranged in opposite directions, at 90* from the first slide blocks and serving to define the profiles of the said plane elements of said moulded part, said movable part including a cap having an interior conical wall, said mould when in closed condition having said four slide blocks maintained tightly in the direction of the center of the mould by means of said interior conical wall of said cap, and separated, when the mould is opened, by columns adjoining the cap and having parts forming ramps for coacting with an oblique bore provided in each of said slide blocks, the oblique bores being of larger diameter than the columns to provide the columns with play at the beginning of the opening of the mould, so that said opening may begin before the start of the radial shifting of the first and second slide blocks from the center, each of the columns controlling the second slide blocks having an elongated portion which is parallel to the movement of the cap of the mould and an inclined portion which acts on the second slide blocks only after the radial shifting of the first slide blocks, a bell crank lever pivotally mounted on the stationary portion of the mould, an oblique lug secured to the cap for engagement by one arm of the lever, and ejector means activated by the engagement therewith of the other arm of the lever when the lug engages said one arm to shift the moulded part axially a distance of half of an interval between adjointing elements of the moulded part, the axial shifting occurring between the two above-mentioned shiftings of the slide blocks, the axis of the cap having a cylindrical sleeve sliding in the stationary part of the mould in the direction of the movement of the movable part of this mould, said sleeve, having a flange said ejector means including a pusher, said flange being directed, by means of said pusher from said other arm of the lever shifting a limited amount and driving in the direction of the mould opening an ejection mandrel, placed on said axis; being set into motion by ejector rods.