Frame structure for casting concrete

A frame structure for casting a concrete building panel, comprising:

• a plurality of panel edge molding frame members each having a generally U-shaped cross-section;
• a plurality of panel corner frame members each having a configuration which, when viewed in plan, corresponds to the angle of the corner of the panels to be molded thereby;
• said panel edge molding frame members and said panel corner frame members being assembled in a panel molding frame with a number of panel edge molding frame members along the portions of the frame corresponding to the edges of the panel to be molded sufficient to equal the length of the corresponding edge of the panel, with the ends of the panel edge molding frame members abutting the panel corner frame members, and with the opening of the U-shaped cross-section of said panel edge molding frame members facing inwardly of the panel molding frame;
• connecting means rigidly connecting said panel edge molding frame members to each other and to said panel corner frame members;
• and
• liner means in the interior of each of said panel edge molding frame members and having the inner portions thereof abutting the interior of said panel edge molding frame members for positioning said liner means in the panel edge molding frame members, and the surfaces of the liner means facing the space within the panel molding frame having a shape complementary to the shape of the edge of the panel to be molded by the use of said frame structure, said panel molding frame, said connecting means, and said liner means together constitute a panel molding frame unit.