Static structures (e.g. – buildings) – Irreversibly reactive component
Reexamination Certificate
2000-09-26
2002-03-26
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Irreversibly reactive component
C052S220800, C052S001000, C052S712000, C052S741300, C052S745210
Reexamination Certificate
active
06360502
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention deals with the field of devices for fire prevention. More particularly the present invention deals with the field of firestop collars adapted to be positioned adjacent to apertures or openings in structural walls in order to seal them in response to a fire condition Such collars often include an intumescent material therein which is responsive to heat to expand rapidly to fill such apertures or holes in structural members in order to prevent fire from spreading from room to room or floor to floor.
More particularly the present invention deals with means for attachment of such firestop collars in position adjacent to apertures in walls and floors and ceilings normally adjacent pipes or other conduits which are necessary in such structures to extend through structural members. These pipes or conduits are usually made of plastic material and can be seriously degraded by fire or heat. It is important that such fixtures or collars be held firmly adjacent to any openings through the structural members in order to more effectively close them preferably with intumescent material when a fire occurs.
2. Description of the Prior Art
There have been a number of patents granted on various configurations for firestop collars and attachment devices such a U.S. Pat. No. 3,052,065 patented Sep. 4, 1962 to R. J. Rettman and assigned to James H. Matthews & Company on “Memorial Vase Retaining Brackets”; and U.S. Pat. No. 3,678,634 patented Jul. 25, 1972 to E. H. Wise et al and assigned to R & G Sloane Manufacturing Company, Inc. on a “Fire Isolation And Insulating Apparatus”; and U.S. Pat. No. 4,364,210 patented Dec. 21, 1982 to P. B. Fleming et al and assigned o Minnesota Mining and Manufacturing Company on a “Fire Barrier Device”; and U.S. Pat. No. 4,538,389 patented Sep. 3, 1985 to H. Heinen and assigned to Intellectual Trade CY S.A. on a “Fire-Break”; and U.S. Pat. No. 4,573,297 patented Mar. 4, 1986 to R. D. Benscoter et al and assigned to Butler Manufacturing Company on an “Economy Poke-Thru”; and U.S. Pat. No. 4,646,486 patented Mar. 3, 1987 to W. Hauff on a “Flame-Retarding Wall Feedthrough Fitting”; and U.S. Pat. No. 4,788,800 patented Dec. 6, 1988 to J. D. Whiteley and assigned to Monsanto Canada Inc., on a “Fire Stop Device”; and U.S. Pat. No. 4,800,926 patented Jan. 31, 1989 to P. C. Beck and assigned to Adolph Coors Company on a “Firebreak For Conduits”; and U.S. Pat. No. 4,894,966 patented Jan. 23, 1990 to P. R. Bailey et al on a “Fire Stopping Apparatus”; and U.S. Pat. No. 4,901,488 patented Feb. 20, 1990 to G. Murota et al and assigned to The Furukawa Electric Co., Ltd. on a “Fire/Smoke Protection Structure For Plastic Pipe Or Cable Channel Portion In A Floor Or Wall”; and U.S. Pat. No. 5,103,609 patented Apr. 14, 1992 to T. L. Thoreson et al and assigned to Minnesota Mining & Manufacturing Company on an “Intumescent fire Stop Device”; and U.S. Pat. No. 5,105,592 patented Apr. 21, 1992 to G. S. MacMillan et al and assigned to Fire Barrier Installations, Inc. on a “Fire Barrier Device”; and U.S. Pat. No. 5,121,594 patented Jun. 16, 1992 to E. S. Wuertz and assigned to Hubbell Incorporated on a “Method For Attaching A Poke-Through Electrical Fitting”; and U.S. Pat. No. 5,301,475 patented Apr. 12, 1994 to S. F. Stefely on a “Fire Stop Device”; and U.S. Pat. No. 5,347,767 patented Sep. 20, 1994 to R. Roth on a “Fire Retardant Sleeve”; and U.S. Pat. No. 5,393,930 patented Feb. 28, 1995 to E. S. Wuertz and assigned to Hubbell Incorporated on a “Self-Anchoring Poke-Through Wiring Device”; and U.S. Pat. No. 5,410,103 patented Apr. 25, 1995 to E. S. Wuertz and assigned to Hubbell Incorporated on a “Self-Anchoring Poke-Through Wiring device”; and U.S. Pat. No. 5,417,019 patented May 23, 1995 to D. P. Marshall et al and assigned to Lamson & Sessions Co. on a “Passthrough Device With Firestop”; and U.S. Pat. No. 5,421,127 patented Jun. 6, 1995 to S. F. Stefely on a “Fire Stop Closure”; and U.S. Pat. No. 5,452,551 patented Sep. 26, 1995 to P. J. Charland et al and assigned to Minnesota Mining and Manufacturing Company on a “Tiered Firestop Assembly”; and U.S. Pat. No. 5,456,050 patented Oct. 10, 1995 to T. T. Ward and assigned to Construction Consultants & Contractors, Inc. on a “System To Prevent Spread Of Fire And Smoke Through Wall-Breaching Utility Holes”; and U.S. Pat. No. 5,634,304 patented Jun. 3, 1997 to M. P. Sakno on a “Water Impervious Intumescent Firestop Collapsing Conduit”; and U.S. Pat. No. 5,814,764 patented Sep. 29, 1998 to J. E. Kohaut and assigned to Raceway Components, Inc. on an “Insert For Poke-Through Fitting”; and U.S. Pat. No. 5,887,395 patented Mar. 30, 1999 to M. Navarro et al and assigned to International Protective Coatings Corp. and Pyro-Tech Industries Inc. on a “Firestop Sleeve”; and U.S. Pat. No. 5,887,396 patented Mar. 30, 1999 to T. L. Thoreson and assigned to Minnesota Mining and Manufacturing Company on an “Intumescent Fire Stop Device Having Quick Fasteners”; and U.S. Pat. No. 5,947,159 patented Sep. 7, 1999 to J. Takahashi and assigned to Tosetz Co., Ltd. on a “Fire Retarding Division Penetrating Member”; and U.S. Pat. No. 5,953,872 patented Sep. 21, 1999 to G. S. MacMillian et al on a “Fire Barrier Assembly”; and U.S. Pat. No. 5,970,670 patented Oct. 26, 1999 to W. H. Hoffman and assigned to J. W. Bollom & Co., Ltd. on an “Intumescent Fire Arrester Collar For Pipelines”; and German Patent No. DE 3341 728 A1 patented Jun. 5, 1985 to J. Ostermann.
SUMMARY OF THE INVENTION
The present invention provides a firestop collar with an improved mounting device positionable adjacent to a cavity defined in a structural panel with an aperture therein. This aperture normally extends from the first to the second side of the structural panel and is formed in order to receive a generally cylindrical penetrating member such as a pipe or conduit extending therethrough for providing electrical HVAC, water or other conduit communication between rooms or floors in a building. These pipes are usually made of a plastic material. Normally these apertures are round and receive pipes which are generally cylindrical and penetrate completely through from the first to the second side of the structural panel. The structural panel can comprise a wall, ceiling or floor of conventional construction.
The firestop collar is designed to be positioned adjacent to a plastic pipe member or other penetrating member extending through such structural panels in order to seal these openings during fire conditions to minimize spreading of a fire throughout a structure. It is normally these openings through the structural panels which provides the pathways through which fire can quickly spread and the present invention provides a collar with intumescent material therein adapted to expand for sealing such openings responsive to sensing of heat.
The firestop collar assembly includes a collar member positionable adjacent the first side of the structural panel surrounding the cylindrical penetrating member adjacent the cavity defined between the cylindrical penetrating member and the structural panel. In this manner it facilitates sealing of the aperture in order to inhibit the movement of fire, smoke and heat through the aperture. The collar is held in place in surrounding engagement to the penetrating member by an anchoring device. At least one or more such anchoring devices are used to hold each collar with respect to the structural panel adjacent the aperture extending therethrough. Each anchor includes a first leg member attached to the collar member and extendable through the cavity of the structural panel to the second side thereof. The first leg member defines a first collar end attachable to the collar member adjacent the first side of the structural panel and a first protruding end spatially disposed from the first collar end and positionable extending through the cavity to the second side of the structural panel. A second leg member is also included which is attached to the collar member at a position spatially dispos
Specified Technologies Inc.
Sperry, Zoda & Kane
Trana Phi Dieu
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