Patent GB-350905-A (GB)
Title: Machines for casting articles from molten metal
IPC: B22D25/04
Filed: 1930-03-10
Abstract: 350,905. Casting-machines. LUND, A. D., 4139, 40th Avenue South, Minneapolis, Minnesota, U.S.A. March 10, 1930, No. 7814. [Class 83 (i).] Metal-pouring.-A machine for casting accumulator grids or other articles has pumps 55, Fig. 9, for delivering the molten metal to the moulds 153, normally submerged in the metal in a melting-pot 39 but capable of being turned about a pivot 48 and raised by a screw 52 to facilitate cleaning of the nozzle 59 &c. after opening a hinged plate 146 and drain-plug 145. To permit the raising of the pump element and also to prevent damage to the pumps in case the molten metal solidifies the cam operated links 84, 106 are connected to the pumpactuating linkwork by spring-pressed wedges 92, Fig. 21, which can be released by a handle 96 or by excessive pressure. When in the normal position the pump element is secured by a clamp 54, Fig. 9. The pot 39 is provided with burners 41, shoots 46, Fig. 2, for introducing, and a plate 144 for retaining, leaden ingots and a support 141 for a thermometer. The plunger-actuating linkwork includes adjustable connections 75, Fig. 9, whereby the stroke of the plungers can be adjusted simultaneously or separately. The plungers operate through a stuffing box containing packing and a lubricant such as graphite. A motor drives the cam-shaft 120, Fig. 8, through chain gear 126, hand-operated clutch 128 and worm gear 123. Moulds; clamping moulds.-Cams 169 on the shaft 120 act through levers 157 and blocks 159 sliding between fixed and spring-pressed blocks 160, 162 of a pair of slides 155, to close two water-cooled moulds 154, 153. A cam 111 then acts through a lever 109, link 106 &c. to allow springs to close the inlet valves, not shown, and a cam 90 acts through a lever 85, link 84 &c. to force down the plungers 57, Fig. 9, thus discharging molten lead through submerged pipe 58 and nozzle 59 into the mould cavities. The cam 90 then raises the plungers, first with the inlet valves closed to empty the nozzles, then with them open. Castings, extracting.-The cams 169 then open the moulds and pins 178, Fig. 8, strike adjustable stop pins 180 and eject the grids which are fed by a plate 182 on to a travelling band 183, driven by the motor 127, which piles them on a table 195, Fig. 2. Coating moulds.-While the moulds are open a burner 208, Fig. 26, carried by a slide 207 is first simultaneously released and turned on by the attendant by rotation of interconnected catch 216 and valve 210 and then, the gas being ignited by a pilot flame, is traversed to and fro between the mould halves to smoke them and returned to its original state. If desired the machine may be slowly driven by a sliding bevel 133, Fig. 8, and hand operated shaft 134. The fixed mould half 153 is held by a spring-pressed bolt 170 and adjusted by set screws 172 and the movable half 154 by compressed springs 175 and studs 173. Each half mould has four networks of grooves 197, Fig. 29, connected by larger grooves 198 to vents 202 and runner 300 which are formed in a hollow watercooled block 202a and separated by a raised wedge 204.