Core lamination for shell-type cores, particularly for transformers

Core laminations for shell-type cores, particularly for transformers, comprising a plurality of said laminations alternatingly reversed, each of said core laminations being of two-piece EI construction comprising an E-part and an I-part, two of said I-parts being obtained from the window stampings of two E-parts stamped simultaneously with the legs pointing toward one another and having a center leg of substantially uniform width, and two yokes connecting the ends of said legs, said yokes being provided with inside edges facing the windows and joints being provided between one side of the center leg and between one side of the outer legs and the adjacent yoke for interleaving with a winding, and the other yoke having no joints with the center leg and the two outer legs, wherein the width (c.sub.1) of the jointless connecting yoke is greater than the width (c.sub.2) of the parted yoke (c.sub.1 >c.sub.2), and greater than half the center leg width (c.sub.1 >f/2) and the width (b) of the two outer legs is greater than half the center leg width (f/2) (b>f/2) and wherein in said plurality of said laminations alternatingly reversed the inside edges of said parted yoke are spaced away from said winding in contrast to the inside edges of said jointlessly connecting yoke with the inside edges of said parted yoke spaced from the inside edges of said jointlessly connecting yoke and the jointlessly connecting yoke inner edges nearer the winding than the inside edges of said parted yoke and said joints are located inside the yokes of said shell-type core.