Pass through firestop device

#The present invention relates generally to firestop devices and, more particularly, to a cast-in-place firestop device for passing cables, pipes, and the like through a concrete partition, such as a floor.

#During the construction of buildings, it is necessary to provide openings or passages through the building floors, walls, and ceilings to permit the running of wires, cables, pipes, and the like. Such openings, however, which are often referred to as through-penetrations, provide one mechanism by which fire and smoke may spread from one compartment of the building to another.

#Through-penetrations in poured concrete partitions may be formed by various techniques including knocking holes in the partition after it has been formed, or using a device which is arranged on a concrete form before the concrete is poured. Such devices may include an intumescent firestop material which expands and closes the opening in the partition in the event of a fire, thereby preventing the spread of fire and smoke from one compartment of the building to another. Such devices are often referred to as cast-in-place pass through firestop devices.

#The present invention will be further described with reference to the accompanying drawings, in which:

#FIG. 1 is a perspective view of a firestop device according to the invention;

#FIG. 2 is a bottom view of the housing;

#Referring now to the drawings, wherein like reference numerals refer to like or corresponding parts throughout the several views, FIGS. 1-6 show a cast-in-place pass through firestop device 2 for providing a through-penetration in a floor, wall, ceiling, or the like. The term through-penetration generally refers to an opening in a floor, wall, ceiling, or the like, which allows cables, wires, pipes, or other items to pass from one compartment of a structure to another. To create a through-penetration using the device 2, the device is secured to a wooden concrete form 46 (FIG. 6) or other surface such as a fluted deck using an adapter 40 (FIG. 5), and concrete is poured into the form, thereby embedding the device 2 in the concrete 44.

#The device 2 includes a generally cylindrical hollow housing 4 having an open first end 6, an open second end 8, a chamber 10 extending longitudinally from the first end 6 to the second open end 8, and intumescent firestop material 26 (FIGS. 3b, 6 and 7) arranged in the device 2 adjacent the first open end 6. It will be recognized that the housing 4 may have a shape other than cylindrical. For example, the housing 4 may have a square or rectangular cross section.

#The housing 4 includes a base portion 4a having a longitudinally extending annular side wall 14 extending from the open first end 6 toward the open second end 8, radially outwardly extending flange portions 15 extending outwardly in opposite directions from the base portion 4a adjacent the open second end 8, a radially inwardly extending shoulder portion 17 extending inwardly from the sidewall 14, and a riser portion 4b having a longitudinally extending annular side wall 16 extending from the shoulder portion 17 to the second open end 8. The base portion 4a has a larger diameter than the riser portion 4b giving the housing 4 a two-tiered tapered configuration in which the base portion 4a has a greater cross-sectional area than the riser portion 4b.