Patent ID: 9103116
Filing Date: 2015-08-11
Classification: A62C,E04B,E04F,E04G,F16L,H02G

Abstract:
1. An assembly forming a tubular passage for poured concrete decks formed on a support surface, comprising: a base having a cylindrical sidewall with an upper end and an opposing lower end and extending along a longitudinal axis, the upper end of the base's sidewall having an inward extending upper flange defining a circular opening, the lower end of the base having an outward extending base flange to support the base on the support surface during use; a tubular cylinder of intumescent material fitting inside and adjacent to the base's sidewall and restrained from movement in a first direction along the longitudinal axis by the upper flange, the tubular cylinder of intumescent material encircling the longitudinal axis and retained in position along the longitudinal axis during use; a first flexible diaphragm seal having an outer periphery engaging an upper end of the base and having an inner periphery defining an opening encircling the longitudinal axis during use, a portion of the diaphragm adjacent the inner periphery having a funnel shape extending out of a plane orthogonal to the longitudinal axis through the outer periphery; a first tube having opposing upper and lower ends with the lower end configured to engage the base, the first tube having an inward extending flange adjacent the lower end configured to engage the periphery of the diaphragm and press it against the base to form a fluid tight seal when the first tube is engaged with the base, the first tube further including a first set of parallel ridges extending outward from the first tube with each of the ridges in a plane orthogonal to the longitudinal axis and spaced apart a first distance; a first extension tube having a sidewall with opposing top and bottom ends, the bottom end of the first extension tube having first and second locking lugs each extending inward from a different opposing side of the first extension tube, with rotation of the first extension tube placing each locking lug between two adjacent ridges of the first set of ridges when the first extension tube is centered on the longitudinal axis and overlaps a portion of the first tube, the first extension tube having ring stiffening ribs or longitudinal stiffening ribs on an outer side of the first extension tube; a pilot hole extending partially through the sidewall of the extension tube from an exterior side of the first extension tube, the pilot hole located relative to one of the first and second locking lugs so that the pilot hole is located in a radial plane passing between two adjacent first ridges.