GB1117503A - Improved method and apparatus for use in the production of pipe intersections - Google Patents

Abstract

1,117,503. Moulding pipes. BRITISH AIRCRAFT CORPORATION (OPERATING) Ltd. 8 Nov., 1965 [14 Oct., 1964], No. 41954/64. Heading B5A. In a metal or plastics pipe intersection (Fig. 3, not shown) which is assembled by joining two or more half sections throughout their length, each half section is formed by a press tool which may be moulded from or comprise a pattern moulded in a mould consists of a rigid plate 11 mounted on a tank 10 and provided with an aperture therein corresponding in shape and size to the desired pipe section outline and over which is fixed an elastic rubber or P.V.C. diaphragm 13 which is subjected on the opposite sides thereof to different fluid pressures whereby it is deflected into the aperture. Different fluid pressures may be applied on opposite sides of the diaphragm 13 by pressure applied from Within the tank 10 or by withdrawing an appropriate amount of water, air or oil from the interior of a filled tank 10. With fluid exhausted from the tank 10 the depression formed by the deflected diaphragm is filled with a moulding compound which preferably has the same specific gravity as the fluid in the tank, e.g. expanded mica material bonded with a resin, and which will harden at room temperature. Where the limbs of the pipe intersection (20) do not lie in a single plane (Figs. 4 and 5, not shown) the pattern may be moulded in two parts divided by intersecting planes (21, 22) using plates (111, 112) (Figs. 6-9, not shown) corresponding in section thereto. More than two plates may be employed.