Patent GB-400200-A (GB)
Title: Improvements in and relating to moulding articles of concrete or other plastic material
IPC: B28B21/64
Filed: 1932-04-11
Abstract: 400,200. Moulding articles from concrete &c. SANDERSON, A., 24, King's Hall Road, Beckenham, Kent. April 11, 1932, No. 10373. [Class 87 (ii).] Pipes, columns, beams, &c. are moulded by using a collapsible or withdrawable core, or a core to be embodied in the final article, laying wire continuously back and forth in slots in the peripheries of a pair of end members between which the core is positioned to constitute tensioned longitudinal reinforcements and thereafter plastering or depositing the moulding material around the wires and core. Discs 2, Fig. 1, may be keyed on a square shaft 1, the discs having radial slots 7, Fig. 2, to receive the continuous longitudinal wires 8 which are tensioned and looped round pegs 10. The discs are also apertured at 18 to receive positioning bars 17 on a split steel cylindrical core 3, which can be contracted to the required size and clamped. The core may comprise end discs, tied by longitudinal rods upon which a web of fabric, paper &c. may be wound spirally. The core may also be built up of two large and one small circumferential sections to facilitate collapse. The end discs may be shaped to produce pipes whose ends are adapted to interengage. Temporary end discs may first be used to enable a waterproof bituminous lining to be moulded after which end discs with slots for the reception of the reinforcements are fitted. The longitudinal wires 8, Fig. 1, may be wound with a helical wire 42 to form a mesh spaced from the core. The moulding material is supplied to the core from a spout which may extend along the length of the core, or may be traversed along the core, the core being rotated while an operator works the material into the wire mesh. After thus covering the core the material is strickled or screeded and further reinforcements such as 43, 44 may then be positioned and additional moulding material supplied to build up the complete pipe, layer by layer. A hand strickle comprises a board 49, Fig. 17, with rounded edges 50 to bear on the end discs and a rounded edge 51 with a lip 47, Fig. 16, to smooth the work. Working surfaces of the strickle may be shod with metal. The strickling may also be effected mechanically by mounting a strickle 97, Fig. 20, spaced on slides 108 actuated by handles 113 the slides also carrying a smoothing roll 115. The handles may be intergeared to ensure uniform movement of each end of the strickle and smoothing roll. Final smoothing may be effected by a plate 117, Fig. 21, mounted on a shank 118 clamped over the strickle. At any stage in the process a waterproofing layer of bituminous or other material may be applied. Metal ferrules may be secured between the wires before moulding, to form a mounting for a stopcock &c. Conduits for electrical cables may comprise bitumenized paper or vulcanized or asphalt fibre tubes 60, Fig. 15, pre-moulded between end discs on a collapsable core, these tubes then being positioned in end members or in a temporary box mould, and packed round with pumice, bituminous wood pulp or other filling material 61. An integral reinforced concrete covering 62 is then moulded on the filling, as above described. Long columns may be moulded in the vertical position, in which case the work is carried out progressively from the upper end downwardly, by raising the core member vertically through a platform on which the workman stands. When moulding in the horizontal position the core spindle may be mounted in vertically adjustable bearings in frames 77, Fig. 19, worm or other driving gear 94 for the spindle being provided ; a screw shaft 83 intergeared with the core spindle being also fitted to enable a guide 85 to be traversed to lay the helical winding. The strickling and smoothing tools are also mounted on this apparatus.