Patent GB-305358-A (GB)
Title: Foundry molding machine
IPC: B22C11/00
Filed: 1928-01-23
Abstract: 305,358. Nicholls, W. H. Jan. 23, 1928. Moulding-machines. - A moulding-machine having a flask support and a pattern drawing mechanism is provided with additional means for raising the flask from its support, after the pattern drawing operation, to permit the flask to be moved laterally from the machine over a trackway. Both jar and squeeze ramming means are provided and the pressure head swings laterally to provide a clear path for sand supply when the flask and ramming parts are in their lowered inoperative position. The pressure head 17 is trunnioned in side supports 5 and carries balance weights 12 so adjusted that when the head is free it swings into operative position in which a stop 13 contacts with a stop 14. Cords 16 coiled round the grooved ends of the trunnions are connected to a. bar 62, Fig. 5, curved to pass round the machine cylinder and fitted with rods 61 actuated by lugs 60, carried by the squeeze piston 18 and passing through slots in the main cylinder 2, to swing the head to the position shown in Fig. 2, when the piston is at the bottom of its stroke. The yoke shaped construction of the head, Fig. 7, permits free passage for charging sand when in this position. The piston 18 acts as cylinder for the jar ram piston 24, air being supplied at 25 and exhausted at 22, the top of the piston 18 being open. Air is supplied to the squeeze piston at 27, Fig. 4, both supplies being under the control of a valve 26, Fig. 3. The head 28 of the piston 24 rests in its lower position on the piston 18 and is flanged at 31 to support a frame 32 to which the pattern plate is attached. The flask is supported on opposite sides by rails 39 resting on a frame 37, 38, surrounding the frame 32, so that the upper surface of the rails is level with that of the pattern plate. The frame 37 is provided at its corners with guide pins 41 slidable in sockets 30, carried by the head 28, and themselves sliding in guides 34, Fig. 2. All these supports move together during the jarring and pressing operations. Additional guide rods 36 on the frame 37 slide in sockets in the main frame and are notched for engagement by pawls 42 mounted on rock shafts linked at 45 and normally held disengaged by a weight 47. The parts are so adjusted that during .the descent after the squeeze-ramming operation the notches align with the pawls which are then operated by a hand lever to lock the frame 37 in its partly raised position. The pistons and pattern plate then descend drawing the pattern. Lugs 54 carried by the head 38 then engage adjustably set nuts 56 on bolts 53 connected to levers 51, 51<a> pivoted on lugs 52, 52<a> on the flask supporting frame 37. These lugs being stationary, owing to the pawls. the levers are rocked to raise rods 49, 49<a> guided in sockets 50 on the frame 37 and connected to tracks 48. The tracks are thus raised to bring their rollers 57 into engagement with the flask and lift it from its support. The levers 51, 51a are so proportioned that the tracks incline, during lifting, in the direction to facilitate discharge of the flask on to a roller conveyer 58. Premature movement of the flask is prevented by a hand released spring catch 69 which also acts as a locating stop when an empty flask is run into the machine from a roller conveyer 59, provided with similar catches on each side to limit the advance of the leading flask. These catches are operated in unison and serve also as lateral guides for the flask when entering the machine. After the empty flask is properly positioned in the machine the pawls are released and the flask on its frame descends to the pattern plate. Should the rods 49 stick, causing the tracks 48 to remain above their normal level, correct positioning is effected by the nuts 55 engaging the lugs 54.