| 摘要 |
927,432. Moulding multi-duct concrete conduits. GAGNE ENTERPRISES Inc. May 7, 1959 [May 7, 1958], No. 15708/59. Class 87(2). Concrete articles are moulded in a machine which has a mould 22 in two parts 23, 24 secured together by bolts 39 which pass through angles 36, 37 on the mould halves with rubber spacers 38 between them, whereby the two parts can move slightly when the mould is vibrated. The mould halves have angles 28 welded at their lower ends by which they are fixed to a deck 21 by spring-loaded bolts with a resilient pad 31 interposed. Mandrels 52 extend upwards, through an opening 57 in the deck 21, being fixed at their lower ends to a cross-member 56. The mandrels pass through a lower pressure platen 58 which largely closes the lower end of the mould halves, having resting on it a transfer platen 59. Rings 61 on the lower pressure platen pass through the transfer platen and are shaped to mould chamfers on the ends of the ducts in the product resulting from the mandrels. The upper end of the mould is closed by a platen 73, pressed down from a crosshead 76 by a spring 74, the crosshead being movable through a rod 78 connected to a hydraulic cylinder, the plate 73 being raised with it through guide pins 79. The upper ends of the mandrels seat in rings 83 on the upper pressure platen 73 which are shaped to chamfer the upper ends of the ducts. A rod 67 is raised by a hydraulic cylinder 69 and moves the lower pressure platen into position. The mould is filled with concrete from a hopper 87. The upper pressure platen 73 is then placed in position and the mould is vibrated by vibrators 47, the mould halves moving relatively to transmit the vibrations. The vibrators are attached to one or more brackets 46 on the mould sides. After vibration, the upper pressure platen 73 is removed and the rod 67 raises the lower pressure platen 58 and the transfer platen 59 till they eject the moulded conduit, which is removed on the transfer platen. Specification 927,433 is referred to.
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