Core for use in casting hollow concrete slab and method of casti

Details Core for use in casting hollow concrete slab and method of casti Core for use in casting hollow concrete slab and method of casti

1980-06-27

1982-08-03

Hoag, Willard E.

Static molds

Having inflatable element

249 66R, 249175, 249178, 264314, 425417, B29C 112, B28B 732

Patent

active

043424414

ABSTRACT:
There is disclosed a core for use in casting a long concrete slab for forming a continuous hole extending alnog its length. The core comprises a relatively rigid, resilient elongated hollow body having closed opposite ends, and a contractible filling member made of an open-cell foamed material and filled in said hollow body. Also disclosed is a method of casting a long hollow concrete slab, using a core having the construction as aforesaid.

REFERENCES:
patent: 1456058 (1923-05-01), Hale
patent: 1605782 (1926-11-01), Rota
patent: 2623261 (1952-12-01), Semeraro
patent: 2892339 (1959-06-01), Flower et al.
patent: 2949658 (1960-08-01), Conn
patent: 2977658 (1961-04-01), Smith et al.
patent: 3104441 (1963-09-01), Smith
patent: 3306568 (1967-02-01), Baber
patent: 4011946 (1977-03-01), Savage et al.

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