Abstract: A method of making die castings of one metal with a row of spaced fingers of another metal mounts the fingers in slots of an elongated holder with portions of the fingers projecting beyond the holder. The holder is mounted in a die casting machine having a molding cavity surrounding the projecting portions of the fingers. Metal is die cast around the projecting portions of the fingers to form a frame. The casting and the holder are ejected from the die casting machine, and the holder is stripped from the fingers. The method is especially useful for making relays for teleprinters and the like where electrical input produces mechanical movement and where the fingers become cores of electromagnets with the die casting metal being non-magnetic.

Abstract: A multiple magnet core unit for relays of teleprinters and the like has a non-magnetic cast metal frame providing an elongated platform for one or more rows of upstanding magnetic metal core fingers which are transversely spaced along the length of the platform and have integral depending anchoring tabs cast in situ in the non-magnetic metal. The fingers are U-shaped with each upstanding leg having the metal grain extending lengthwise thereof and adapted to receive a coil therearound to provide an electromagnet and with the tab depending from the bight portion of the U integrally anchored to and surrounded by the cast metal. To produce the unit, the core fingers are mounted in transverse slots of an elongated holder with the tabs on the fingers projecting beyond the holder. A pair of holders are mounted in a die casting machine to span the molding cavity and the casting is formed around the tabs. Supporting pins prevent the weight of the holders from warping the casting as it is ejected from the mold cavity.