Page 413 Advertisement 4

Progress, Volume XIV, Issue 5, 1 January 1919, Page 413

Concrete Article Expansion Mould. patent, No. 39594, has been taken out by David Fisher, of 35, Majoribanks Street, Wellington. It consists in forming the mould with sides made up of a number of separate parts that are held together by an internal frame having angle-irons that overlap with lugs upon the inside of such side members. This internal frame is made of cross-members having ends that taper inwards towards their bottoms, and the sides of the mould are also correspondingly tapered, so that when the internal portion is forced down it has a wedging action to force the side members apart, and when it is drawn upward the ,!fC ■f 1 1/£ s'-O * L&L JCJ. \' rJ li A/ i i JL c i 2 \sz7:I::L ! ~S: i zz j j 11 > T Cr - J{ r 2 engagement of the angle-irons with the lugs on such members will draw the members together again. The engaging edges of the members composing the sides of the mould are made to overlap with one another at angles of 45%, so that as they are distended the joints are maintained intact. The mould thus constructed may be used as the internal die of a mould for the formation of articles of various shapes, and particularly W.C. cisterns, washing-tubs, baths, &c., in which the sides are made parallel to one another, or of cylindrical articles such as drainpipes, flower-pots, vases, and the like, the same features of construction providing for the expansion and contraction of the die or mould being embodied in all such forms.