Patent GB-744598-A (GB)
Title: Improvements relating to core and mold making machines
IPC: B22C15/24
Filed: 1952-04-09
Abstract: 744,598. Moulding-machines. OSBORN MANUFACTURING CO. April 9, 1952 [Feb. 23, 1952], No. 9131/52. Class 83 (1). Moulding mechanism comprises platen conveying means for transporting a platen in horizontal position from station to station with dwells at such stations, such platen having mould-enclosing means thereon, means at one station to lift the platen from the conveying means for performance of a moulding operation and to return the platen to the conveying means at the same station after said moulding operation, and means at another station to lift the platen from the conveying means for drawing the mould and then to return the platen to the conveying means at the same station. As applied to core-making, the apparatus comprises a core-blowing machine 1, a turntable 2 movable to transport five core-boxes mounted on individual platens 56, each having trunnions 57 and supported in pairs of arms 58, through five stations, a turnover device 3 and a drawtable 4. The core-blowing machine comprises a carriage 11 reciprocable by a piston 12 between positions beneath a sand-hopper 14 and a blow-head 15. A vertically-reciprocable clamppiston 16 carries a clamp table 18 adapted to engage and raise a core-box 5 into engagement with a blow-plate 19 on a reservoir 13. The turntable is journalled on a strain-rod 10 and is supported by rollers 22 carried by a lower rigid table 24. Also rotatable about the rod 10, between the turntable and the table 24, is a member 26 having two slideways 27, 28. A rocking arm 29 actuated through a rack 33 and gear segment 32 by a piston 34 causes the turntable to rotate counterclockwise through steps of 72 degrees, the movement being cushioned by a cylinder 37, and a slide 42, reciprocable in the slideway 28, engaging one of five downwardlyprojecting equidistantly-spaced rollers 41. Slide 42 is disengaged from the roller 41 to allow movement of rack 33 to rock arm 29 and member 26 back into the starting position where slide 42 may engage the next roller 41 for another indexing movement. The table is locked whilst slide 42 is out of engagement with a roller 41, by an arm 46 actuated by a piston 45, the arm 46 being linked with an arm 48 which engages a pin 43 projecting from the slide 42 such that when piston 45 moves the arm 46 to engage a roller 41, the arm 48 is simultaneously moved to withdraw the slide 42 out of engagement with the same roller 41. A rib 54 permits in and out movement of slide 42 only at the extreme limits of its travel. The turnover device 3 comprises a rotatable shaft 63 having keyed thereon an arm 64 whose lower portions 65 carry cleats 68, 69, which engage recesses 66, 67 in the platens 56 and are clamped thereto by pistons 70. Drier-plates 73, which may be manually placed on the core boxes at the station preceding the turn-over station, are held in position by spring-steel arms 77 actuated by pistons 75 in cylinders 74, the pistons having cam slots engaging pins in the cylinder walls so that the arms are swung laterally to a position over the box and then downwardly against the drier-plate. Shaft 63 is rotated by a piston 80 and a rack and pinion 81, 84 through 180 degrees to turn the platen, core-box, and drierplate into an inverted position over the drawtable 4, the movement being cushioned by a cylinder 99. On engagement of the drawmechanism with the drier-plate the pistons 75 are actuated to swing the arms 77 downwardly and to the side. The draw-mechanism, Fig. 5, comprises vertically-reciprocable pistons 87, 88 connected by a draw-head 89 carrying supporting members and whose upward movement is limited by an adjustable stop 90. Run-out rollers 97, 98 are mounted at each side of the draw-head and receive the drier-plate with the drawn core thereon after the draw-head has been retracted. At the station preceding the turn-over station compressed air may be applied to each core-box to remove loose pieces or vents, a stand 104, Fig. 4, being provided thereat and supporting the core-box, as at the turn-over station, by cleats 68, 69 and clamping- pistons 70. The piston-rods are bored and connect with a passage 107 in the platen, a flexible tube leading therefrom to a vibrator 109, or alternatively to cylinders in the core-box. At the two stations following the turn-over station the empty boxes are inspected, cleaned and made ready for blowing, e.g. a parting agent may be applied, loose pieces and vents inserted and support wires placed in position. The electrical control system incorporates a timermechanism and limit-switches which ensure that the correct sequence of operations is performed, means being provided whereby, e.g., the turntable, turn-over mechanism and core-blower may be operated separately. Specification 744,656 is referred to.