Static structures (e.g. – buildings) – Wall – ceiling – or floor designed for utilities – Having a passageway through the entire wall – ceiling – or...
Reexamination Certificate
2000-05-18
2002-06-18
Stephan, Beth A. (Department: 3635)
Static structures (e.g., buildings)
Wall, ceiling, or floor designed for utilities
Having a passageway through the entire wall, ceiling, or...
C052S232000, C052S742140, C052S001000, C052S317000, C285S042000
Reexamination Certificate
active
06405502
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a self sealing coupling assembly which allows for the passage of utility members through partitions of a structure such as floors or walls while preventing the transmission of fire and smoke through the coupling assembly. In particular, the present invention relates to a self sealing coupling assembly which includes an extension adjacent one end having an intumescent material which expands to block the inner passageway of the extension to prevent the transmission of fire and smoke through the inner passageway of the coupling assembly.
(2) Description of the Related Art
The related art has shown various types of firestop couplings using intumescent material to close the passageway to prevent the transmission of fire and smoke through the passageway. Illustrative are U.S. Pat. No. 4,272,643 to Carroll et al; U.S. Pat. No. 4,364,210 to Fleming et al; U.S. Pat. No. 4,573,297 to Benscoter et al; U.S. Pat. No. 5,155,957 to Robertson et al; U.S. Pat. No. 5,309,688 to Robertson U.S. Pat. No. 5,347,767 to Roth and U.S. Pat. No. 5,417,019 to Marshall et al.
Carroll et al shows a fire resistant fitting having plates with a disc of expandable fire resistant material spaced therebetween. The plates and disc have passageways for the conduits.
Fleming et al describes a fire barrier device having a sleeve of intumescent material affixed to the interior of a cylindrical penetration. An end cap is mounted in one end of the cylindrical penetration. The end cap functions to seal the penetration against the passage of flames, smoke and gas. The end cap can be constructed of an intumescent material or a flame proof elastomeric material. The use of an elastomeric material improves the seal around the conduit or other member passing through the end cap. The cap has a plurality of radial cuts such that the cap is divided into a plurality of segments. The segments are easily displaced to permit the passage of a conduit past the segments wherein the segments can be manipulated into conformance about the cable. Alternatively, the end cap can be custom fitted with a specific diameter aperture or apertures.
Benscoter et al describes a poke-through floor fitting having a firestop means for sealing the fitting against the passage of fire and smoke through the fitting. The fitting has openings for power conductors and communication conductors.
Robertson et al describes a fire safety device for closing through-holes in floors and walls. The device includes a conduit which is surrounded by a cup-shaped retainer. The conduit may be formed of any suitable material. The retainer is preferably constructed of sheet metal. The retainer is spaced a uniform distance from the outer surface of the conduit to provide a confined space for the intumescent material. The retainer is spaced away from the outside wall of the conduit except at its bottom edge where the retainer conforms to the outside wall of the conduit to prevent leakage of molten intumescent material therebetween. The upper end of the retainer has a plurality of outwardly extending flanges for attaching the retainer to a floor or wall surface. An annular cover disk is attached to the upper end of the retainer to cover the top of the confined space having the intumescent material. The bottom end of the retainer is provided with floating tabs which extend the floor of the retainer inwardly upon destruction of the conduit to prevent the molten intumescent material from falling through the bottom of the retainer cup.
Robertson describes a penetration unit for use in a concrete slab for receiving a service line or pipe. An intumescent material may be provided in the unit to crush the service line or pipe so that heat, smoke, fumes and fire will not pass up through the pipe to the next floor of the building.
Roth describes a fire retardant sleeve assembly having a tubular housing with a collar having intumescent material which is securely held in place by the housing. The housing also acts as a heat conductive shield. The assembly allows a user to slide a raceway into and through a ceiling or floor.
Marshall et al describes a coupling device to provide a pass through opening for pipes in the wall of a structure. The coupling device includes an outer housing having an open lower end and a closed upper end with coupling elements extending therebetween. An intumescent material surrounds the coupling elements and fills the space between the coupling elements and the outer housing. The intumescent material locates and positions the coupling elements within the outer housing. The intumescent material is positioned such that the material expands to close off the pass through opening and prevent smoke or fire from traveling through the wall of the structure.
Also of interest are U.S. Pat. No. 4,221,092 to Johnson; 4,848,043 to Harbeke; U.S. Pat. No. 4,882,886 to Harbeke; U.S. Pat. No. 4,888,925 to Harbeke; U.S. Pat. No. 4,916,800 to Harbeke; U.S. Pat. No. 4,951,442 to Harbeke, Jr.; U.S. Pat. No. 5,390,465 to Rajecki and U.S. Pat. No. 5,452,551 to Charland et al.
Johnson describes a sleeve which limits the spread of fire through the floors and walls. The sleeve is constructed of an intumescent material having embedded metallic heat conductors to increase heat conductivity through the intumescent material.
Harbeke ('043) describes an under the floor firestop coupling assembly. The coupling assembly includes a tubular-shaped main body with a main body flange to which a firestop collar including a metallic band and intumescent material is mounted. The metallic band is wrapped into a tubular shape with the ends of the metallic band being attached together by rivets or screws. The lower end of the metallic band includes inwardly directed tabs to support the intumescent material and to receive and conduct heat throughout the metallic band. The coupling is mounted into a hole in the floor such that the main body flange contacts a bottom surface of the floor and the firestop metallic band extends below the floor. A lower main body portion extending below the main body flange is sufficiently long such that the firestop collar can be mounted thereon and the lower end of the firestop collar is approximately located at a lower end of the lower main body portion but not much longer. The firestop collar is rigidly mounted on the pipe coupling both by friction caused by internal pressure of the metallic band pressing radially inwardly and by an adhesive placed between the intumescent material and the outer surface of the lower main body portion. In addition, once the main body flange is against the floor, fasteners are driven through the outwardly directed tabs of the metallic band and the main body flange into the bottom of the floor.
Harbeke ('886) describes a pipe attachment device having an intumescent material cuff. The intumescent material cuff is not enclosed in a housing.
Harbeke ('800 and '925) describe pipe coupling assemblies having an intumescent collar mounted around a first end of the pipe coupling with a metallic band wrapped around the intumescent collar. The metallic band serves to protect and hold the intumescent collar together and provides a heat conductor at the circumferential surface of the intumescent collar.
Harbeke, Jr. ('442) describes a, firestop collar for mounting around pipes. The collar has an intumescent material surrounded by a metallic band.
Ralecki describes a device for installation in a building wall or floor to provide a pass through opening. The device has an open first end and a second end closed by a wall. A ring of intumescent material fills the open first end. The intumescent ring can be provided with a central opening sized to engage with an interference fit, a pipe passing through the device. Alternatively, the ring can support a tube coupling for providing a tubular connection within the device to receive and couple pipes on opposite sides of the wall or floor.
Charland et al describes a firestop assembly having at least two (2) i
McLeod Ian C.
Moyne Mary M.
Slack Naoko
Stephan Beth A.
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