System for forming lined passages through concrete walls

Details System for forming lined passages through concrete walls System for forming lined passages through concrete walls

1991-08-19

1996-04-23

Nguyen, Kien T.

Static structures (e.g., buildings)

Wall, ceiling, or floor designed for utilities

Having a passageway through the entire wall, ceiling, or...

52503, 285363, E04C 252

Patent

active

055092403

ABSTRACT:
A system for producing a sleeve-lined passage of uniform diameter D through a concrete wall molded in a concrete wall form including first and second form plates mounted in fixed relation and spaced by a wall width W includes a multiplicity of modular spools, preferably made of sheet steel; each spool comprises an annular shell having an axial length L less than W and an inside diameter D with front and rear flat flanges extending outwardly of the front and rear rims of the shell. For a first group of spools the axial length L is of three inches; for the other spools length L of four inches.

REFERENCES:
patent: 2065072 (1936-12-01), Hertzka
patent: 3396539 (1968-08-01), Khan et al.
patent: 3528668 (1970-09-01), Barton
patent: 3914843 (1975-10-01), Antonacci
patent: 3988867 (1976-11-01), Vaananen
patent: 4399315 (1983-08-01), Iida
patent: 4598519 (1986-07-01), Reid
patent: 4625940 (1986-12-01), Barton
patent: 4852319 (1989-08-01), Cowan
P. 6 1985 Thunderline Catalog LS-119-G.

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