100 CONCRETE BLOCKS PER HOUR

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The mold and the ejector, Figs. 2 and 3, are made for three blocks. There are two cores in each compartment of the mold and note especially that each core is vented (Fig. 2) and tapered slightly so that it will draw easily without breaking the edges of the block. Cores can be cast from a rich cement-sand mixture or they can be made of heavy sheet metal, welded. Where facilities and materials are available, they also could be cast from aluminum.

Fig. 16, details A to E inclusive, shows a one-core mold (A and B) which is suitable for certain special types of blocks. Detail C supplements Fig. 6 and shows more clearly the procedure and placement of the hands in ejecting the block from the mold, while details D and E suggest types of elevated tracks or rails for moving blocks away from the machine and to the curing yard, as in Fig. 7. Curing racks of any convenient size may be assembled from hardwood boards, steel angles, and flanged rollers as in Fig. 16-D. Detail E suggests one way of providing for easy handling of the blocks from the machine to the curing racks.

General assembly views of a hand-operated machine for making a few blocks at a time are given in Fig. 17. Here most of the work is done by hand, only the vibrator being motor driven. It's easy to build for either a one-, two-, or threeblock mold. Proportions of the mix which have been found most satisfactory are 7 parts pea gravel, 12 parts sharp sand, 2 parts silt, and 2-1/2 parts portland cement. The amount of water is determined by experiment as it depends on the dampness of the aggregate.

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