Woven Wire Screen Cloth: Hardened Crimped Steel Rods Locked by Driven Straight Rods (Robins, US 2,154,530, 1939)

Screen cloth for gravel and stone wears out fast unless the steel is hard, but hard steel cracks when it is bent in weaving. Robins crimps the rods first, hardens them, and lays them up in layers without bending; straight hardened rods driven in endwise lock the whole panel under spring pressure. Result: coarse screen cloth, openings 5/8 in and up, hardened to as much as 60 Rockwell C; it lasted about twice as long. Source: Robins, US 2,154,530 (1939). He names only steel; a high-carbon steel is ours, since only a hardenable steel reaches 60 Rockwell C. Not given: crimp pitch, hardening heat and quench. Picture drawn by Youblob.