| 摘要 |
1,214,877. Casting pipes. MONIER RESEARCH & DEVELOPMENT PTY. Ltd. 29 Feb., 1968 [7 March, 1967], No. 9971/68. Heading B5A. [Also in Division C1] Pipe is tamped from a mix of basic igneous rock, clay and water by a packer head apparatus consisting of a cylindrical mould having internally associated therewith a packer head with depending skirt which is capable of rotating as a unit relative to the cylindrical mould, while being moved upwardly at a controlled rate of travel directly above the pipe which is being progressively formed from a pipe mix fed from above into the annular space between the said skirt and the cylinder. The lower face of the peripheral portion of the packer head plate is provided with a series of circumferentially spaced ramps or "thread" starts which tamp the upper face of pipe mix fed past the packer head into that portion of the cylinder immediately below it. The skirt functions to form the interior surface of the pipe and, if desired, may be differentially driven in relation to the packer head so that both the head and the skirt may rotate at any desired relative speeds which are dictated by any instantaneous circumstances. The newly formed pipe may be removed from the cylindrical mould by applying pressure to one end of the pipe and forcing the pipe out of the mould. |
