Patent GB-332277-A (GB)
Title: Improvements in die casting machine
IPC: B22D17/04
Filed: 1929-04-16
Abstract: 332,277. Triggs, W. W., (A.C. Spark Plug Co.). April 16, 1929. Casting-machines; metal-pouring; castings, extracting. - A die-casting machine has a furnace and melting pot unit which is moved to bring it into contact with the die. The machine is set in operation by moving a hand lever 31 to the left thus closing a clutch, in casing 29, and causing the pulley 28, to rotate gears 33, 34 through shaft 30, gearing, in casing 32, and pinions 32<a>. The adjacent faces of the gears 33, 34 have identical cam grooves engaged by bowls on a lever 46 which is connected, through a buffer 52 and links 58, to a furnace 11 and melting pot 12 which have wheels 6 running on a bracket 3 adjustable vertically by a screw 5. The lever 46 is also connected to a cross-head 63 through links 50, slide 61 and levers 67, 68, each pivoted to the slide 61, to a toggle 70 pivoted to the frame, and to a link 72 connected to the cross-head 63 which is, in turn, connected by two or four rods 64 to the moving mould half 26. The gear 33 has, on its outer face, a cam groove 76 engaged by a bowl on a lever 77 which is connected, through linkwork 78, 82, to a semi-rotary valve 86 which controls the supply of compressed air or the like from a tank 87 to a piston, 16, which is adapted to reciprocate a crosshead 21, Fig. 3. The metal-forcing plunger 22 has a head adapted, in the left casting position of the pot 12, to engage a corresponding slot in the crosshead 21. The shaft 35, carrying the gears 33, 34 may have a crank 36 adapted to reciprocate a bar 37 which, after one cycle, engages a pin 40 on the clutch operating lever 31 and stops the machine. Before stopping however the roller 38 of the bar 37 rides up an incline 41 so that the lever 31 can be operated to re-start the machine. If the molten metal tends to corrode the pot &c. the plunger 22 may be replaced by a valve 117, Fig. 11, and the gear 34 have a cam groove 102 to operate air inlet and exhaust valves 109, 110 so as to apply pressure, at the correct times, to the pot 12 which, in this case, has a closed cover. The opening 118 serves to admit ingots of metal and to ensure that there is no pressure in the pot, when withdrawn, even if the valve 110 is open. The nozzle 121 and tube 116 may be replaceable. The molten metal may be wiped from the nozzle by a lever pivoted on the pot and operated by bowl engaging a stationary cam. In a modification the starting lever 31, Fig. 15, moves a rack 148 to rotate a sleeve 143 which, by reason of a pin in inclined slot, also moves axially and closes a clutch and causes the drive to be transmitted from a pulley 138, through reducing gearing 155, 157, 159, to the shaft 160 which carries six operating cams. One acts, through a lever 164, buffer 170, and links 169, to reciprocate the pot and furnace 11; the second acts, through a slide and rods 174, to reciprocate the mould-half 26; the third 161 acts, through a lever 176, link 180, lever 181, and link 182, to reciprocate a core 183 in the mould-half 26; the fourth acts, through a lever 189, link 190, lever 191. crosshead 194, and linkwork 187, 186, to reciprocate a core arranged between the mouldhalves. The crosshead 194 also actuates a horibontal core (not shown) through a link 195, lever 198, shaft 199, and pinion and rack (not shown). The fifth cam acts, through a lever, chain gearing 207, and a shaft to control the valve 86 and the sixth acts, through a slide 209, lever 210, pinion 212, and rack 213, to actuate ejectors. The shaft 160 has a crank 216 which reciprocates a rod 217 having a notch 221 to engage and rotate the sleeve 143, after one cycle, and thus stop the machine. The bar 217 can however be thrown out of action and then the machine operates continuously.