Patent GB-787540-A (GB)
Title: Foundry moulding machines
Inventor: KUEHLTHAU HUGO LOUIS
IPC: B22C11/00
Filed: 1956-01-02
Abstract: 787,540. Moulding-machines. PETTIBONE MULLIKEN CORPORATION. Jan. 2, 1956, No. 86/56. Class 83 (1). In a moulding-machine the clamping-head comprises an hydraulically-actuated cylinder disposed therein for operation of flask-engaging means in said clamping-head, in which cylinder a piston is reciprocally mounted and is provided with a spider rigidly secured thereto, said spider having a pair of substantially parallel flask-engaging clamping-shoes secured to opposite edges thereof with an equalizer-bar in engagement with said shoes and extending transversely therebetween with its centreportion pivotally secured to the piston, whereby the equalizer-bar transmits the clamping-force of the shoes to the piston. The mould-supporttable 4 and clamping-head-assembly 38 are rotatable through 180 degrees about a shaft 13 by means of cylinders 16, 17, a dashpot cushioning the movement. The clamping-head is supported on an arm 22 mounted on a post 24 and adjustable in a horizontal plane therearound. A clamping-cylinder 29 is secured to the framework, and the piston-rod 37 is secured to the clamping-head-assembly to cause the arm 22 to reciprocate vertically with the piston-rod 37. The clamping-head 38 comprises a fixed cylinder 40 and a piston-rod 41 carrying a spider 42. The four arms 54 of the spider carry two tie-rods 59, 60 whose ends pass loosely through apertures in web-portions of the clamping-shoes 43, 44, the apertures extending vertically so that the shoes may adjust themselves automatically to conform to any irregularities of the flask-board 10. The shoes are locked in position by the admission of pressure-air to a chamber 76 formed between end-plates 67, 68, Fig. 8, the air-pressure pressing the ends of plate 67 and web of shoes 44 against the sleeves 56, 58 on the tie-rods with sufficient frictional-force to prevent movement of the shoe 44 relative to the tie-rods, and at the same time constraining the tie-rods to the left to frictionally lock the shoe 43 against movement. An equalizer-bar 45 transmits the clamping-force to the piston-rod 41 instead of to the spider, the bar being pivotally connected to jhe piston by a pin 81, and its ends engaging loosely in the webs of the clamping-shoes. Rollers 46 are rotatably supported adjacent the two edges of the clamping-head extending between the clamping-shoes, and extend slightly below the shoes when the pistonrod 41 is in its uppermost position. In operation, with a moulded flask on the table and the pattern-board 9 interlocked with the table, the piston-rod 41 is actuated to move the clamping- shoes downwardly within the range of the clamping piston-rod 37, and the piston-rod 41 is then locked. The piston-rod 37 is then actuated until the shoes engage the board 10 and hold the flask against the table. Air is then forced into the chamber 76 to lock the clamping- shoes, and the assembly inverted. The piston 41 is then actuated to move the shoes downwardly so that the flask-board rests on the rollers 46; the pattern-board, being interlocked with the table 4, remaining stationary so that the pattern is drawn. The filled flask may then be rolled from the rollers 46 on to a conveyer. Conventional jolting-apparatus may be provided to pack the sand after a filled flask is positioned on the table.