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Improvements in and relating to the manufacture of bricks and blocks for building purposes
Improvements in and relating to the manufacture of bricks and blocks for building purposes
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机译：建筑用砖和砖制造方面的改进
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258,314. Stewart, P. M., and Ratcliffe, G. H. C. May 15, 1925. Stationary-mould machines; moulds; pressing plungers and dies. - Bricks, having four V- shaped frogs b and a central orifice a, as shown in Fig. 1, or having a deep recess C, Fig. 7, and a large shallow frog d, are made from granular material in a pressing-machine having top and bottom vertically-acting pressing plungers f1, g1, Fig. 13, and a fixed central core k carried by a cross-bar l mounted in a slot in the lower plunger. The core forms a guide for both plungers and also forms an annular recess in the mould into which pulverized moist clay falls by gravity when delivered by a reciprocating feed carriage (not shown). The plungers are caused to approach and recede from one another by mechanism (not shown).
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