Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Dividing work to form plural articles
Patent
1983-03-15
1985-01-22
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Dividing work to form plural articles
249 86, 264228, 2642979, 425111, B28B 2306
Patent
active
044951272
ABSTRACT:
A method of manufacturing railway switchpoint concrete sleeper blocks of varying lengths and having different number of attachment means located in mutually different positions for the attachment of rails. A plurality of steel matrix plates 102 whose respective lengths correspond to the desired lengths of the various sleeper blocks and which exhibit detachably mounted dowels 109 are placed end to end in an elongate mould bed with the dowels facing upwardly, whereafter reinforcing rods 5 are tensioned and concrete is poured into the mould bed and permitted to harden. The thus formed coherent concrete body is then removed from the mould and the matrix plates removed, with the dowels remaining cast in the concrete block. The concrete body is then cut into sleeper blocks of desired length. The dowels are accurately mounted in predetermined positions in frame members 111 affixed to the matrix plates. Upon casting and hardening of the sleeper blocks the frame members are disengaged from the plates and the in-cast dowels for renewed use in a subsequent casting operation.
REFERENCES:
patent: 4102957 (1978-07-01), DaRe
patent: 4204660 (1980-05-01), Feuillade
patent: 4242071 (1980-12-01), Stinton
patent: 4255104 (1981-03-01), Stinton
patent: 4290991 (1981-09-01), Thim
A-Betong AB
Housel James C.
Sabema Material AB
Woo Jay H.
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