초록 ▼

A fire-stop stack fitting (34) includes a cylindrically-shaped coupling wall (36) having a stop (52) therein for receiving pipes to be coupled from first and second ends. The first end of the cylindrically-shaped coupling wall is affixed to a cavity forming wall (42) defining a cavity which is open

A fire-stop stack fitting (34) includes a cylindrically-shaped coupling wall (36) having a stop (52) therein for receiving pipes to be coupled from first and second ends. The first end of the cylindrically-shaped coupling wall is affixed to a cavity forming wall (42) defining a cavity which is open in an inwardly radial direction and in a first-end axial direction but which is closed in an outwardly radial direction and in a second-end axial direction. An attachment flange (46) is affixed to the first end of the cavity-forming wall for attaching the fire-stop stack fitting to a concrete form (50). An intumescent material (44) is placed in an intumescent-material cavity (62) and the flange of the fire-stop stack fitting is fastened to a concrete form wall. After concrete (56) has hardened and the form wall (50) is removed, pipes (38, 40) are inserted in opposite ends of the cylindrically-shaped wall (36). The intumescent-material is quickly heated by fire on the first side of the wall since the intumescent-material cavity is open to that side and the intumescent material is free to expand radially into the pipe (40) inserted into the first end of the fitting.

대표청구항 ▼

A fire-stop stack fitting for providing a fire-retardant fluid-conveying pipe coupling joint embedded in a concrete barrier, said stack fitting comprising: a cylindrically-shaped coupling wall having opposite first and second ends for forming a passage therethrough, said cylindrically-shaped couplin

A fire-stop stack fitting for providing a fire-retardant fluid-conveying pipe coupling joint embedded in a concrete barrier, said stack fitting comprising: a cylindrically-shaped coupling wall having opposite first and second ends for forming a passage therethrough, said cylindrically-shaped coupling wall having opposite openings for receiving fluid conveying pipes therein to be coupled therewith, said cylindrically-shaped coupling wall further comprising a stop means positioned inside said passage for contacting the ends of first and second fluid conveying pipes inserted into the respective opposite first and second ends of said cylindrically-shaped coupling wall for preventing said pipes from passing further through said cylindrically-shaped coupling wall, said stop means having an internal surface which is exposed to fluids passing through said cylindrically-shaped coupling wall between said fluid conveying pipes inserted into opposite ends thereof; a cavity-forming wall whose second end is ridgedly affixed to said first end of said cylindrically-shaped wall and which is longitudinally spaced from said stop means, said cavity-forming wall defining an intumescent-material cavity extending about the circumference of said first fluid conveying pipe inserted into said opening at said first end which is open in an inwardly radial direction and in a first-end axial direction, said intumescent-material cavity being of a size for holding a sufficient amount of intumescent material for expanding radially inwardly, when heated, upon said first fluid conveying pipe and thereby closing off said first fluid conveying pipe; and, an attachment flange ridgedly affixed to said fire-stop stack fitting for attaching said fire-stop stack fitting to a concrete form, said flange extending radially outwardly at a first end of said cavity forming wall; whereby, said fire-stop stack fitting can be attached to a concrete form wall by fastening said attachment flange to said concrete form wall to thereby leave an intumescent-material cavity in a concrete wall which, when said concrete form wall is removed, is open from a first side of said concrete wall and which is adjacent to a pipe coupled to said first end of said cylindrically shaped coupling wall so that intumescent material located in said intumescent material cavity is quickly heated by a fire on said one side of said wall and is free to expand radially inwardly against said pipe.