Patent GB-655900-A (GB)
Title: Improvements in moulding-machines
IPC: B22C15/10
Filed: 1948-07-21
Abstract: 655,900. Moulding-machines. RONCERAY, R. A. M. July 21, 1948, No. 19520. Convention date, Jan. 20. [Class 83 (i)] A moulding-machine comprises a stand with an adjustable fixed upper plate, a lower mould supporting plate secured to an operating piston within which is a vibrator, a frame for supporting the flask, means whereby the frame is carried up with the lower plate but on the descent is arrested so as to strip the pattern from the mould, and means for supplying pressure fluid in the correct sequence to actuate the parts of the machine. The machine framework comprises a column 18, Fig. 1, supporting the upper plate 23, and a cylinder 2 in which operates the main pressing piston 3. The lower plate 6 is screwed to a jarring piston 4 arranged within the piston 3. Piston 3 is actuated by compressed air supplied through a passage 31, Fig. 2, and the jarring piston 4 by compressed air supplied to a space 27 through a passage 26 and escaping after a slight lift of the piston, through passages 28. A passage 24 in the walls of the jolt piston supplies compressed air for the operation of a vibrator 9 mounted in the piston immediately below the plate 6. Flexible tubing connects the passages 24 and 26 to a distributer. Secured to the underside of the plate 6 are guide rods 32 working in sleeves 33 integral with the machine frame 1, and also rods 34 passing through and adapted to lift a frame 37 carrying adjustable rods 43 positioned to support the mould. The frame 37 is independently guided by depending rods 38 formed with racks 39 meshing with pinions 41 on a common axle 42. Rods 38 slide in sleeves 40 which are cut-away to receive semicircular brake shoes 45, each adapted to be pressed inwardly by a piston 46 against a spring 50 in order to brake the descent of the frame and so strip from the mould the pattern on the plate 6. Compressed air is supplied in turn to the jarring piston 4, the pressing piston 3 and the braking pistons 46 by a distributer comprising a casing 60, Fig. 7, connected with a compressed air supply at 120, closed at the top by a disc 54 having three apertures adapted to be connected to the above-stated pistons and a central escape opening 69. The three apertures are connected in turn with the inlet 120 by a disc 61 having a single aperture 67 and adapted to be rotated step-by-step by means of a lever or pedal-operated pawl engaging rollers 76 on a plate 72 secured to a shaft 70 keyed to the disc 61. The supply of compressed air to the vibrator 9 is controlled by a separate pedal. The central outlet 69 of the distributer is connected at 94 with a casing 95, Figs. 10 and 11, which is also connected at 112 with the air intake to the vibrator 9. The casing has three outlets, one 102 controlled by a manually adjustable needle valve 103, one 100 controlled by a spring-pressed valve 96 and one 111 adapted to be closed by a plunger 108 while compressed air is being supplied to the vibrator. This arrangement effects an automatic reduction in the rate of descent of the plate 6 during the stripping period, when the vibrator is being operated.