Patent GB-794493-A (GB)
Title: Improvements in or relating to foundry moulding machines
IPC: B30B15/16
Filed: 1953-08-26
Abstract: 794,493. Moulding - machines. BEECH, A. S., and FOUNDRY EQUIPMENT, Ltd. Aug. 26, 1954 [Aug. 26, 1953], No. 23635/53. Class 83 (1). A jolt-squeeze moulding-machine comprises a table, a head thereabove and squeeze-cylinder below, a movable squeeze-ram, abutting against the underside of the table but not secured thereto, a stripping-cylinder and piston within and concentric with the squeeze-cylinder, the movable member whereof projects downwardly below the squeeze-cylinder and is connected to a stripping crosshead, a jolt cylinder and ram within and concentric with the squeeze-piston and above the stripping-piston so as to be capable of raising the table independently of the squeeze-ram, means for operating the joltcylinder by connections taken through the table, and control-means for operating pressure-fluid supplies to each of said cylinders. A machine comprises a head 4 on a swinging arm 5 mounted on a post 6 having helical grooves which provide cam-faces for followers on a swinging headblock 82. Vertically reciprocating movement of the block by a ram 81 thereby causes the head 4 to be rotated. The table 10 comprises a cylinder 11 reciprocably mounted on a stripping- cylinder 12 in the main squeeze-cylinder 13, pressure-air being admitted to the space 15 above the cylinder 12 through line 16 from the jolt-mechanism 8 so as to lift and jolt the table 10, the cylinder 12 functioning as a jolt-ram. A piston 20 in the cylinder 12 supports a crosshead 22 carrying the mould stripping-pins, pressure-air being admitted beneath the piston 20 through line 25 to raise the crosshead and pins for mould-stripping. The operating cycle is initiated by actuation of a push-button 30, allowing pressure-air to flow to the jolt-cylinder 11 via valve 35 and jolt-interlocking-valve 36. As jolting continues, pressure builds up in a vessel 38 via an adjustable jolt-regulator 37, until a head-swinging valve 39 opens, directing pressure-air to head-cylinder 40 and top swing- ing-head valve 46, reversing valve 35 to stop jolting, and resetting valves 45, 65, underneath the table, said valves 45, 46 ensuring that the table is in its lowermost position before the stripping and vibration takes place. When the ram 81 of the head-cylinder reaches the end of its stroke it opens valve 46, thereby opening squeeze-cylinder-valve 48 to direct air to the squeeze-cylinder 13. Air also passes to a spring- loaded regulator-valve 47 which opens when the pressure in the squeeze-cylinder overcomes the pre-set spring-loading of the valve, and causes the squeezing-stroke to be stopped. Valve 39 is also reversed, air is directed to the upper end of cylinder 40, and the head swings to one side. Table-operated valve 65 prevents air passing to the cylinder 40 until the table 10 has returned by gravity. When the ram 81 reaches the end of its stroke, it operates the lower swinging-head valve 54, opening vibrator-valve 55, which controls the vibrator, table-operated valve 45 preventing air passing to the vibration-valve until the table is seated. Opening the valve 55 also causes the strip-valve 50 to be opened and air to be directed to the strip-cylinder 12, through an arrangement of two oil-containing tanks to obtain a slow initial stripping-movement. Simultaneously pressure is built up, through a regulator 60, in a vessel 61 so that after a predetermined period of vibration, strip-interlockvalve 53 operates to reverse valve 55 and stop vibration. A return stripping-pin push-button 31 resets valve 50 to bring down the stripping- pins and reset valve 36 for the next cycle. Specification 748,551 is referred to.