Patent ID: 6149121
Filing Date: 2000-11-21
Classification: E04G

Abstract:
A modular one piece passage unit adapted to be mounted in a concrete wall form with other such units to create a passage of controlled uniform size and configuration through a concrete wall molded in the concrete wall form, the concrete wall form including first and second form plates mounted in fixed spaced relation to each other with inner surfaces facing each other and separated by a spacing W, the modular passage unit being of generally drum-like configuration and comprising:an annular main shell having a size and configuration conforming to an axial segment of the desired passage through the concrete wall and having a given axial length L1, with L1<W;a front unit closure wall, closing off a front face of the main shell;the front unit closure wall including means for mounting the modular passage unit in predetermined position on the inner surface of the first form plate of the concrete wall form with at least the outer annular edge of the modular passage unit sealed against that inner surface;a rear unit closure wall closing off a rear face of the main shell;and interlocking means for interconnecting the modular passage unit with a second modular passage unit of like size and configuration so that the main shells of the two passage units are aligned with and immediately contiguous with each other within the concrete wall form;the main shell, the front unit closure wall, the mounting means, the rear unit closure wall, and the interlocking means all constituting a single, one piece integral unit.