Abstract: A transformer framing structure in which the distance between the opposing end faces of the primary and secondary coils is increased to improve the dielectric strength of the transformer, and also the primary and secondary coils are framed by separate frameworks to allow separate winding of the respective coils to thereby improve assembling workability. According to this invention, the number of the dies used for molding of the frame body, bobbin assembly and cover of the framing structure is lessened, and mounting of the terminals is simplified to allow easy terminal assemblage. Also, adaptability of the transformer to a printed substrate is improved.

Abstract: Leads electrically connected to the respective terminal portions of coiled wires in a core-type transformer are each provided with a flange on the insulating covering. A set of lugs formed on each of two opposite ends of a coil cover or of a coil bobbin have first grooves in spaced side-by-side relationship for receiving parts of the leads and second grooves arranged crosswise with the respective first grooves for receiving their flanges. A pair of lead covers are snapped into position to enclose the parts of the leads together with the flanges thereon and their connections to the terminal portions of the coiled wires, in such a manner that the leads can be positively retained in position in the respective grooves.