GB152748A - Improvements in the method of and apparatus for making cementitious articles - Google Patents

Abstract

152,748. Crozier, A. O. July 17, 1919. Processes; moulding - machines; stream - cutting machines; feeding.-Cement and like articles, such as bricks, blocks, and pipes, are made by pouring into an upright shaft a column of cement mixture of such a height as to effect by its own weight a compacting of the lower part ot the column, which is them cut off, or cut off and cut up, and removed; the remainder of the column then descends, and the shaft is filled up again. Fig. 9 shows a machine for carrying out this process. The mixture fills a hollow shaft 18, the lower end of which is closed by one of a series of removable plates 20, shown in its lowest position after the lower end of the column of material has been cut off by an horizontal knife 19 and cut up by a number of vertical knives 17, all reciprocated by a pair of connecting-rods 24. The plates 20 are stacked in a container 30, and are removed from its lower end by pawls 37 on a sliding frame 31 reciprocated by a lever 32. A plate 20 arriving beneath the column 18 is at once raised by a toggle 42 and table 40, and the knives 17, 19 are quickly withdrawn, so that the cement mixture, hitherto supported in the shaft 18 by the knife 19, falls suddenly upon the plate 20, so that the lower end of the column is compacted and freed from excess moisture. The knife 19 then moves forward through horizontal slots in the lower end of the shaft 18, and the knives 17 then pass through a number of similar vertical slots, and cut up the block into smaller pieces. The plate 20 is then lowered suddenly; the bricks stick momentarily to the underside of the knife 19, which gives to them a characteristic roughened surface. The knives are mounted on guide sleeves 21 moving on guide rails 22, and are reciprocated by gearing in connexion with the main shaft 50, which also drives, by means of wormgearing, the shaft 45 and cam 33 for moving the levers 32, 42. Hollow bricks may be made by placing in the shaft 60, Fig. 16, a number of vertical rods or cores 61; the lower end of the column is cut off by a pair of horizontal knives 63 with serrated edges. Lengths of pipe may be made in a similar machine which may have a rotating core 61 and shaft 60 in order to render the surfaces of the pipe smooth. The knives may have bevelled edges in order to increase, if desired, the compacting of the material, and may be replaced bv taut wires, saws, or the like, followed by a plate serving to support the mixture in the shaft 18.