Patent GB-651744-A (GB)
Title: Moulds for grid casting machines
IPC: B22D25/04
Filed: 1948-02-23
Abstract: 651,744. Plant ; casting-machines casting processes ; moulds. WINKEL, H. C. Feb. 23, 1948, No. 5330. Convention date, Aug. 28, 1940. [Class 83 (i)] A mould for a machine for casting a battery grid comprises two co-operating mould parts, one of which carries a flash preventing plug with an end face in spring-pressed sealing engagement with the parting surface of the other mould part to prevent the formation of flash between the plug and parting surface. The mould is adapted to be filled as it travels in the direction of the arrow beneath a pouring spout and to this end is provided with an inlet 53 having shaped forward and rear ends 64, 65 and transverse baffles 61. Each terminal lug'cavity 47a is provided with a flash preventing plug 66 slidably mounted in one mould part 14 by means of pins 69 and pressed against the other mould part 16 by a spring 71. The end face has a casting cavity 67. The Specification as open to inspection under Sect. 91 comprises also a casting machine having a circular frame 1 on which is pivotally mounted a table 4 driven from a motor 8 through gears 5, 6 and having rollers 11 running on the edge 12 of the frame. Around the table are outwardly-extending brackets 13, each of which carries co-operating mould parts 14, 16, the part 14 being secured to the bracket and the part 16 sliding on guide rods 15 extending from the part 14. Projecting outwardly from each mould part 16 are brackets 19 with notches 18 to receive a yoke member 17 secured to a rod 23 pivoted at 24 to a cam-operated lever 25 adapted both to close the mould part 16 up to the part 14 or to separate them against the action of a spring For this purpose, a roll 27 at the lower end of each lever 25 engages the outside of an arcuate cam 29 during the pouring and cooling portion of the cycle and the inside of a shorter arcuate cam 28 at the discharge station. The yoke 17 may be lifted out of the notch 18 if it is desired to move the mould part 16 manually. A bar 22 at the rear of each mould part 14 moves forward an ejector plate 32 carrying pins 31 when the rod 23 is actuated to separate the mould parts. The grids discharged from the mould at the discharge station slide down a shoot 30 on to a table 41 which is driven by a chain from the table 4 so that all the grids from a particular mould are stacked in one pile so that if one mould should become defective, the grids therefrom are automatically segregated. The moulds are heated by means of gas burners 40 supplied from a central pipe 36 and radial pipes 38. In one form, as shown in Figs. 8 and 9 (Cancelled), the mould parts meet in a plane and are grooved to form casting cavities for the grid frame 47, vertical grid members 49 and horizontal grid members 48. The mould parts are also recessed to form chambers 52 in which during casting, air and other gases are compressed by the weight of the molten metal so that the casting cavities are completely filled without the formation of fins. In a modified form, Fig. 11 (Cancelled), the mould parts meet along zig-zag parting lines to form casting cavities 57 and gas compression chambers 58. The bottom of the grid may be formed with a corrugated reinforcing strip for protection during discharge from the mould and subsequent trimming. This subject-matter does not appear in the Specification as accepted.