Patent GB-653445-A (GB)
Title: Improvements in moulding machines for producing cement or like bodies
IPC: B28B7/16
Filed: 1947-12-29
Abstract: 653,445. Moulding machines for cement and like bodies. WATTHOLMA BRUKS AKTIEBOLAGET. Dec. 29, 1947, No. 34376. Convention date, Dec. 28, 1944. [Class 87 (ii)] A moulding machine for cement &c, blocks comprises a mould 22 open at top and bottom and fixed, with a small lateral freedom for vibration, between collars 26, 28 on a pair of hollow standards 12. Depending cores 24 may be provided in the mould. A delivery table 48 is slidable on the standards 12 and urged upwards by springs 50 to close the bottom of the mould. A cross beam 32 having sleeves 34 embracing the standards 12 carries a pressing and ejecting plunger 29 formed with depending members 30 shaped to fit the spaces between the cores 24, the spaces between the members 30 accommodating the cores 24 when the plunger is brought down to press and eject the moulded block. The mould 22 is filled with moulding material, and vibrated by means, not shown, driven by the motor 18. The motor 14 is then started to bring down the plunger 29 by means of gearing 15 driving threaded rods 16 within the standards and engaging nuts 36 within the sleeves 34. The plunger 29 compresses the moulded material to an extent determined by arms 42 fixed to the units 36. After a certain degree of compression the ends of the arms 42 engage projecting parts of the table 48 to lower it as the plunger 29 continues to move down to eject the moulded block. The compression is adjustable by means of screw members 44 on the ends of the arms 42. When extensions 35 of the sleeves 34 engage the collars 28 the plunger stops but the arms 42 and table 48 continue down against the spring 50 by virtue of a lostmotion device to free the top of the block from the plunger. The motor is then automatically switched off by a limit switch (not shown), and the block removed. The motor is reversed to restore the Fig. 1 position, the motor then being switched off by a second limit switch (not shown). The mould has sufficient lateral freedom of movement for vibration purposes. The Specification as open to inspection under Sect. 91 describes the apparatus of Fig. 4 (Cancelled). A mould 14 with vibrators 16 attached, driven by the motor 20 is fixed by pairs of collars 22, 24 to standards 12, with sufficient lateral freedom for vibration. A table 26 carrying a plate 30 which forms the mould bottom is slidable on the standards 12 and urged upwards by springs 28. A pressing plunger 32 is carried by a support 34 having sleeves 36 slidable on the standards 12. An intermediate member 40 with lugs 50 slidable on the sleeves 36 is connected to the piston rod 42 of an hydraulic or pneumatic cylinder 44 carried by a fixed cross-head 48. Arms 52 project downwardly from the lugs 50 and bellcrank levers 54 pivoted to the member 40 space this member from the plunger support 34. After vibration of the filled mould the cylinder 44 is operated by handle 72 controlling valve 68 to bring the plunger down, compressing the moulded article until the arms 52 engage the table 26 to lower it and allow the article to be ejected from the mould. At a certain point chains 60 connecting the horizontal arms of the levers 54 with the fixed member 48 become taut and rotate the levers to allow the intermediate member 40, arms 52 and table 26 to move further down, further movement of the plunger being prevented by extensions 38 on the sleeves 36 abutting the collars 22. The upper face of the block is thus separated from the plunger and the block may be removed as before. Operation of the cylinder 44 in the reverse direction restores the position shown. This subject-matter does not appear in the Specification as accepted.