Patent GB-467526-A (GB)
Title: Improvements in or relating to the manufacture of structural objects or articles with the aid of fibrous cement
IPC: B28B1/52
Filed: 1936-03-10
Abstract: 467,526. Moulding fibrous cement. BILLE, L. March 10, 1936, No. 7229. Convention date, March 13, 1935. [Class 87 (ii)] [Also in Group X] In the manufacture of hollow or solid bodies such as joists, trellis work, posts, tubes, walls, flooring, and roofs, fibrous cement in the form of a liquid pulp is spread upon a porous body such as of rubber sponge or cloth, and when the excess water has been absorbed and the cement has attained the required plasticity, the cement while still on the porous body is applied to the surface of a core or former. When the cement has been moulded to the core, the porous body is removed. The cement may be applied with metal reinforcements to rubber, fibrous cement, or other cores that are subsequently withdrawn from the finished article. A flanged joist, Fig. 1, is made by applying a layer 1 of fibrous cement to a metallic core or former 2 having keying notches or hooks that are clinched by a hammer to the layer. Metallic surfaces may be coated with glue and sprinkled with sand before the application of the fibrous cement layer. Metallic reinforcements may be nailed to wooden surfaces for attaching the cement layers or coatings. By compressing the coatings with rubber sponge, wrinkled surfaces are produced. Large-mesh trellis work, Fig. 2, is made by coating sponge rubber or solid rubber cores 6 reinforced with tubes 7 with asbestos cement and placing them at the parts 8, 9, 10 on a slab 4 of asbestos cement reinforced at 5. A reinforcement 11 of metallic cloth, fabric, or other sheet material is then placed over the coated cores and connected to the reinforcement 5, and other coated cores 12, 14 are placed between the cores already in position. A layer 15 of asbestos cement is then applied and further metallic reinforcement 16 is connected to the reinforcement 11 and is finally covered with a layer 17 of asbestos cement. A few hours later, the tubes 7 are withdrawn from one side and the cores 6 from the other side. Coverings for pipes &c. are made in a similar manner by placing cores covered with fibrous cement in several rows around a cylindrical former and compressing in a press. The rubber cores are withdrawn. Cores of agglomerated cork may be used and left in the finished product which is thereby rendered buoyant. Hollow beams B, Fig. 4, for floorings or wall elements are made by placing. cores covered with asbestos cement in superposed rows, applying metallic reinforcement at 19, 20, 21, and wooden slats 22 retained by bars 23 connected to steel wires or rattan 24. The whole is then compressed, and the cores are withdrawn. The cores comprise rubber elements 42 and reinforcing tubes 18, or pieces 33, 34 of steel-reinforced fibrous cement separated by a strip 35 of rubber. The hollow beams B are joined by cement or by casting reinforced concrete 27 between them, Thin boards 25 may be cemented to the beam and plaster or sheets of plaster applied below. In some cases, thin boards 26 are nailed or glued to slats secured to the top of the beam. Wall elements W, Fig. 5, are made by a method similar to that used in making the beams B, Fig. 4, and may have the face 27 moulded with white cement to imitate quarried stone. Hollow posts, spars, or braces, Figs. 6 and 7, are made by placing a layer 28 of fibrous cement over a core, applying reinforcement 31, and then a second layer 32 of fibrous cement. The whole is then surrounded with a tight band of fabric or rubber. When the cement has hardened, the cores &c. are removed. The cores may be made of moist wood, of apertured rubber 29 provided with a loosely-fitting rod or tube 30, or of pieces 33, 34 of reinforced fibrous cement separated by a rubber strip 35. Roofings may be made in situ by suspending metallic reinforcement 38, Fig. 8, between hollow beams 36, 37 and applying layers of fibrous cement to each side of the reinforcement. The layers may be covered with metal plates 39, ceramic squares, slates, &c. In some cases, roofing, Fig. 9, is made of long lattice-type tiles covered at their junctions with caps 40.