Moulding plastic articles

Abstract

Abstract The specification discloses a method of making an aperture defined frame member, particularly a window-frame, comprising a rigid frame-shaped reinforcement make of e.g., a solid metal section embedded in synthetic resinous material. The method comprises placing the reinforcement in a mold cavity having the shape of the required frame member and locating the reinforcement in the cavity solely by engaging complementary interfitting formations on the reinforcement and on pin-like projections which extend from the cavity walls, e.g. recesses on the reinforcement engaging the ends of the projections. The longitudinal axes of all the projections are parallel to a predetermined plane and the engagement of the end of each projection with the complementary recess of the reinforcement prevents movement of the latter at least in first directions perpendicular to the plane. The projections are located around the reinforcement to prevent movement of the reinforcement in second directions parallel to the plane. The mold cavity is filled with synthetic resinous material to embed the reinforcement therein while the reinforcement is located in the cavity by the projections, and the cavity is subsequently opened and the projections withdrawn from the completed frame member which is then removed from the cavity.

Inventors

• 👤 V Humphrey

Bibliographic Details