GB1396202A - Clay pipe fitting moulding methods and apparatus - Google Patents

Abstract

1396202 Moulding clay pipes AIRCRAFT MECHANICS Inc 4 Aug 1972 36586/72 Heading B5A [Also in Division F2] A branched clay pipe 1 (Fig. 3) is formed in a mould 10 (Fig. 2) around cores 34, 36, the branched pipe being removable without dismantling the mould through an outlet opening common to both cores. In a first embodiment, the core 34 and an enlarged plug 42 are moved into the mould 10 by a carriage 22 running along I-beams 26 on wheels 104. When seated on the mould 10, a collar 50 is rotated to engage a pair of bevelled arms 52 with a pair of hooked arms 48 on the mould (see also Fig. 1, not reproduced). The core 36 and enlarged plug 44 are moved by a double-acting hydraulic cylinder 32 to seat against the mould 10 and the plug 42, and are locked by collar 50. Green clay 110 is forced from a feeding head 16 into the mould 10 and around the cores 34, 36, until it emerges through ports 51, 53 in the plugs 42, 44. The collars 50 are unlocked, and continued feeding of clay pushes the formed pipe branch and the cores 34, 36 through the common mould outlet opening against a powered arm 94. The clay feed is stopped, and a centrifugal cutter 76 operated to cut a desired length of clay. The core 36 is retracted (now or after unlocking the collats 50). The pipe branch is supported from below and the core 34 withdrawn by arm 94, the plug 42 and a collar 43 being held stationary by posts 64 and abutments 67 to push off the pipe branch. The pipe branch is surface finished and transferred to an oven. In a second embodiment, the mould 151 (Fig. 9) includes a permanent core 171 that mates with a retractable plug 164, and, with a second core 163 and plug 162 that slide on a support attached to the mould 151. At the start, the clay column 167 reaches the end of the permanent core 171. Plug 164 is positioned and locked to a fixed mould arm (203) by pivoting a mould arm (208) (see Fig. 4, not reproduced). Core 163 is positioned to leave a gap adjacent the core 171 for free clay feeding and plug 162 is locked by piston-and-cylinder controlled pivoted latches'(see Fig. 4a, not reproduced). When clay weeps from holes 213 in the plugs 164, 162, the clay feed is stopped and core 163 is fully extended by movement relative to plug 162. Plug 162 is unlocked and core 163 retracted fully. The plug 164 is unlocked. Clay is fed again to push the pipe branch from the mould 151 for support by blocks 212, and the clay is severed by a centrifugal cutter 173. The pipe branch is removed by a caterpillar conveyer 211. A clay web is removed from the junction of the pipe branches. Tees, 45 degrees wyes, and double wyes are formed using an extruder as described in U.S.A. Specifications 2,795,027 and 2,795,028.