Patent GB-190124991-A (GB)
Title: Improvements in or relating to Moulding Machines.
Inventor: BOULT ALFRED JULIUS
Filed: 1901-12-07
Granted: 1902-12-06
Abstract: 24,991. Boult, A. J., [Lewis, W.]. Dec. 7. Moulding.-A moulding-machine provided with a swinging yoke against which the sand is rammed, and a vibrator to assist in withdrawing the pattern, has the movements of the yoke, the ramming-head, the vibrator, and the flask support controlled by two valves, one of which serves to rock the yoke into the upright position and then, and not before, to operate the ramming-head, while the other sets the vibrator in motion and then lifts the flask support to draw the pattern. The yoke 7, Fig. 1, is pivoted in a base 1 and normally held in the vertical position by a spring 18 acting on an arm 15 on the pivot shaft 7<a>, and is rocked clear of the ramming-head 3 by admitting air under pressure to an oil reservoir 30, from which oil under pressure passes to a cylinder 19, the plunger 20 of which is connected by tie-rods 22 to the arm 15 and provided with a dust-guard 23. In order that the yoke may be gradually started and stopped when moving in either direction, the plunger is shaped and arranged with respect to the oil pipe as shown in Fig. 8, so that the admission and exhaust through the passage 29 is throttled at each end of the stroke. The plunger is packed by a gasket 25, preferably of leather, resting against a thimble 28 secured on the plunger, the gasket being uniformly pressed against the plunger by a spring 27 acting on a ring 26 with a bevelled face engaging a corresponding bevel on the gasket. The head 6 of the yoke is adjustable on the side standards and held by detents 10 supported by notched rods 9 on the standards and pressed into engagement with teeth 5 on them by a screw carried by the head, this arrangement ensuring parallelism of the heads 6, 3. The ramming-head is carried by a cylinder 33 moving over a plunger 4 on the base, and held against rotation by a feather 34. Air is supplied to a central aperture in the plunger by a pipe 35, and its admission to or exhaust from the cylinder when near the lowest position is restricted by a block 36 on the lower side of the head to prevent shock. The flask support 37 is raised above the head 3 by plungers 40, Fig. 3, on the support working in cylinders 39 on the head and provided with dust-guards 41. The plungers may be packed as shown in Fig. 8, or by the modified arrangement shown in Fig. 3, in which the bevelled edge of the thimble 45 is pressed against the gasket 46 by a spring 46*. Oil under pressure is supplied to each cylinder by a pipe 43 from a reservoir 42, and its initial entry and final exhaust are throttled by a plug 44 to prevent shock. The oil used in operating serves to lubricate the cylinders and plungers. The upward movement of the support is limited by rods 47 on a plate 48 secured to the support, the rods passing through the head and having springs resting on rings 50 which rest on shouldered collars 49. These collars are divided so that they may be placed in any of the seats formed on the ends of the rods, the rings holding them in place. A vibrator 52 is secured to the frame carrying the pattern plate, the frame being supported on the head by elastic struts 53, solid struts 54 preventing excessive yield during ramming. The valve 55, Figs. 1 and 14, for controlling the movements of the yoke and ramming-head, is operated by a handle 56 and has passages 57, 58. The valve is set in the position shown in Fig. 14, to connect the pipe 35 of the cylinder 33 to the exhaust 61 and to admit air from the supply pipe 59 to a pipe 60 leading to the tank 30, thus ensuring that the head is in its lowest position while the yoke is swung clear of it to allow the mould to be filled. The valve is then turned counter-clockwise to connect the pipes 60, 61 by the passage 57, its movement being limited by a segment on it engaging an arm on the yoke. Air then exhausts from the tank 30 and the yoke is returned to the vertical position by the spring 18, after which the valve can be further turned to connect the pipes 35, 59 by the passage 58 to raise the head to effect the ramming. A tappet 67 on the head can engage the valve handle 56 to return it to the exhaust position to limit the upward movement of the bead should the moulding-box be empty. The head may be lowered by returning the valve. The valve 68 for controlling the vibrator and flask support has an upper and lower set of passages shown in their initial positions in Fig. 10, in which the air pipe 74 of the oil tank 42 is open to the exhaust 78 through passages 75, 77, and the vibrator pipe 72 is closed to the air supply 71. The pivoted handle 69 of the valve is first turned against a stop 70 to connect the passages 71, 72 to start the vibrator without connecting 71 and 74. The handle is then lifted over the stop and further turned, first to connect passages 71, 76, 77, 74 to raise the flask support, the vibrator still being in action, and then to shut off the vibrator while completing the drawing of the pattern. The valve is then brought back to the position shown in Fig. 10 to lower the flask support. An ordinary blower may be connected to the passage a. A modified form of base-plate for the machine consists of castings suitable for the machine bolted to channel-iron connections.