Molten metal filter

Claim 1

A filter for removing solid particulate material from molten metal, comprising: an integrally formed cloth bag having pervious bottom wall, side walls and end walls constructed from a woven rectangularlyshaped glass fiber cloth said cloth having; a rectangular central section for forming the bottom wall; two side sections on opposite sides of the central section terminating in side edges for forming the side walls; two end sections on opposite ends of the central section terminating in end edges for forming the end walls; four corner sections at corners of the cloth for interconnecting the end and side sections to enclose the bag; said cloth having first longitudinal fold lines extending longitudinally across the cloth separating the central section and the side sections and separating the end sections and corner sections; said cloth having first transverse fold line extending transversely across the cloth intersecting the first side fold line separating the central section and the end section and separating the side sections and corner sections; said cloth having second longitudinal fold line extending longitudinally across the cloth intermediate the first longitudinal fold lines and the side edges; said cloth having second transverse fold lines extending transversely across the cloth intermediate the first transverse fold line and the end edges intersecting the second longitudinal fold lines; said cloth having third transverse fold lines extending transversely across the cloth intermediate the second transverse fold lines and the end edges; said cloth having a diagonal fold line extending diagonally from the intersection of the first fold lines to the second transverse fold lines; said side and end walls being constructed in sequence with (1) the end sections and corner sections between the second transverse fold lines and the end edges being twice folded in one direction back upon themselves along the second and third line transverse fold lines with the end edges tucked under and hidden, (2) the end sections and corner sections being folded in the one direction along the first transverse line to a substantially right angle to the central section to form the end walls; (3) the side sections and corner section being folded in the one direction along the first longitudinal fold lines and the diagonal fold lines to a substantially right angle to the central section to form the side walls; (4) the corner sections being folded back along the outside of the side walls along the first transverse fold lines from the intersection of the first fold lines to the side edges; (5) the side sections and corner sections being folded back upon themselves to the inside of the side wall along the second longitudinal fold lines; and securing means for securing those portions of the side, corner and end section that have been folded back upon themselves to the side and end walls respectively to secure the edges on the inside of the bag.