Abstract:
A relatively inexpensive bushing easily installed extending through walls, particularly, gypsum board membrane walls for providing firestopping around a limited number of linear penetrating members such as cables or wires. This grommet construction includes first and second half sections for facilitating attachment around cables more easily. A split internal seal preferably of resilient foam material is positioned within a split mechanical shell which facilitates placing of the bushing around penetrating members prior to placement thereof through walls or after positioned thereof penetrating through a panel such as wallboard. A split mechanical shell with a two-piece foam insert retained within a bore extending therethrough can be formed as two separable half cylindrical shells. Barbs are included on the outer portion of the shell to facilitate mounting thereof. The foam firestopping seal portion can be intumescent.

Description:
[0001]    The present utility application hereby formally claims priority of currently pending U.S. Provisional Patent application No. 61/279,050 filed Oct. 15, 2009 on “FIRESTOPPING BUSHING” filed by the same inventors as listed herein, namely, James P Stahl Sr., James P. Stahl Jr., Julio Lopes and Paul Gandolfo, and assigned to the same assignee, namely, Specified Technologies, Inc. of Somerville N.J.; said referenced provisional application being hereby formally incorporated by reference as an integral part of the present application for all purposes. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention provides a unique construction for a relatively inexpensive bushing or grommet that can be installed into walls to provide sealing about individual cables or wires or around a number of small cables and/or wires or other linear penetrating members normally numbered no more than three. The bushing can also extend around to seal around a wire plug or cable plug. The bushing includes an internal foam seal which is designed to seal against the passage of smoke, flames or hot gases therethrough for achieving firestopping. 
         [0004]    Heretofore such cables have been run through openings formed in the walls or floors and then sealed with the use of various mastic materials such as sealants or putties, some of which were for firestopping. Such openings are often sleeved in some circumstances with cables running through the sleeves and sealing materials are thereafter applied within and around the sleeve at the point where it penetrates through the wall or other barrier. These uses are limited in many ways because, for example, the sealants tend to adhere the cables with respect to one another and with respect to the opening through the wallboard which makes any changes needed to the cabling configuration at a later time quite difficult. Also, such mastic materials are usually applied by hand by skilled workers and this is a labor intensive activity requiring skill and the time required can be quite costly and the effective quality of the sealing is highly dependent on the skill of the technician. Also, these prior methods lack a finished overall appearance because the actual appearance of the final seal is very highly dependent upon the skill and diligence of the technician applying the mastic materials. 
         [0005]    Many mechanical designs have also been designed such as rubber plugs or framing constructions designed to fit around one or more wires. Many of these constructions cannot be installed in typical gypsum board membrane walls because the wallboard lacks sufficient structural strength to restrain the expanding fixture especially when the fixture utilized is a rubber plug or similar design. 
         [0006]    Usages of these above described designs are limited because many of them can only be placed upon the wire prior to placement through the wall because there is no capability for attaching the bushing or grommet to the wire after it has been positioned extending through aperture provided in the wall. Most such constructions are also designed for use with many different cables and larger cables and, thus, there is a readily apparent for use for a small inexpensive type grommet which can be easily be attached to cables, plugs or a plug used therewith after they have been placed extending through the wallboard as well as being capable of usage prior to positioning of the cable or cable plug extending through the wallboard. 
         [0007]    2. Description of the Prior Art 
         [0008]    Many prior art devices have been used for firestopping around cables extending through a wall and for sealing around said cables such as shown in U.S. Pat. No. 2,542,583 patented Feb. 20, 1951 to W. T. Shea, Jr. on a “Cable-Sealing Fitting”; and U.S. Pat. No. 2,985,091 patented May 23, 1961 to R. L. Hatcher and assigned to Noll Manufacturing Company on a “Cap Assembly”; and U.S. Pat. No. 3,125,358 patented Mar. 17, 1964 to J. S. Kleinberg et al on a “Building Lead-In Connection For A Pipe”; and U.S. Pat. No. 4,018,983 patented Apr. 19, 1977 to J. W. Pedlow on an “Electrical Arc And Fire Protective Sheath, Boot Or The Like”; and U.S. Pat. No. 4,086,736 patented May 2, 1978 to L. P. Landrigan and assigned to Daniel International Corporation on a “Fire And Liquid Seals For Pipes And Conduits And Method Of Forming Same”; and U.S. Pat. No. 4,225,649 patented Sep. 30, 1980 to R. L. Peterson and assigned to The Flamemaster Corporation on a “Fire Retardant Composition And Cables Coated Therewith”; and U.S. Pat. No. 4,276,332 patented Jun. 30, 1981 to G. K. Castle on a “Fire Proof Cable Tray Enclosure”; and U.S. Pat. No. 4,302,917 patented Dec. 1, 1981 to L. A. Fermvik et al and assigned to Telefonaktiebolaget I. M. Ericsson on a “Method And Means For Fire-Sealing A Penetration For A Conduit”; and U.S. Pat. No. 4,363,199 patented Dec. 14, 1982 to C. S. Kucheria et al and assigned to Kennecott Corporation on a “Fire Resistant Sealing System For Holes In Fire Resistant Buildings Partitions”; and U.S. Pat. No. 4,467,577 patented Aug. 28, 1984 to R. R. Licht and assigned to Minnesota and Manufacturing Company on an “Intumescent Fire Barrier Material Laminated With Restraining Layer”; and U.S. Pat. No. 4,513,173 patented Apr. 23, 1985 to R. P. Merry and assigned to Minnesota Mining and Manufacturing Company on “Intumescent Fire Protective Sheaths”; and U.S. Pat. No. 4,548,853 patented Oct. 22, 1985 to H. H. Bryan on a “Closure For A Surface Opening Having An Object Passing Therethrough And Method Of Forming The Closure”; and U.S. Pat. No. 4,559,745 patented Dec. 24, 1985 to J. B. Wexler and assigned to Fire Research Pty. Limited on “Devices For The Fire Stopping Of Plastics Pipes”; and U.S. Pat. No. 4,623,170 patented Nov. 18, 1986 to K. R. Cornwall on a “Coupling”; and U.S. Pat. No. 4,630,415 patented Dec. 23, 1986 to R. L. Attwell and assigned to Selkirk Division of Household Manufacturing Limited on a “Fire Stop”; and U.S. Pat. No. 4,936,064 patented Jun. 26, 1990 to J. F. Gibb and assigned to Backer Rod Manufacturing And Supply Company on a “Fireproof Panel”; and U.S. Pat. No. 5,174,077 patented Dec. 29, 1992 to G. Nurota and assigned to The Furukawa Electric Co., Ltd. on a “Fire Protecting Structure Of Channel Portion Of Plastic Piping In A Fire Partition”; 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. 5,390,465 patented Feb. 21, 1995 to J. A. Rajecki and assigned to The Lamson &amp; Sessions Co. on a “Passthrough Device With Firestop”; and U.S. Pat. No. 5,447,400 patented to H. E. Seymour on Sep. 5, 1995 and assigned to Xantech Corporation on a “Wall Penetrator Fitting”; and U.S. Pat. No. 5,560,174 patented Oct. 1, 1996 to Y. Goto and assigned to Home Co., Ltd. on a “Connector”; and U.S. Pat. No. 5,594,202 patented Jan. 14, 1997 to M. A. Tobias on a “Split Sleeve System”; and U.S. Pat. No. 5,634,304 patented Jun. 3, 19997 to M. P. Sakno on a “Water Impervious Intumescent Firestop Collapsing Conduit”; and U.S. Pat. No. 5,729,938 patented to M. A. Tobias on Mar. 24, 1998 on a “Wall Penetrator Sleeve System”; 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. 6,711,329 patented Mar. 23, 2004 to Dd. J. Zelesnik and assigned to Parker-Hannifin Corporation on a “Flame Retardant Tubing Bundle”; and U.S. Pat. No. 6,718,100 patented Apr. 6, 2004 to D. D. Morris and assigned to Milliken &amp; Company on a “Fire Resistant Conduit Insert For Optical Fiber Cable”; and U.S. Pat. No. 6,876,797 patented Apr. 15, 2005 to D. D. Morris and assigned to Milliken &amp; Company on a “Fire Resistant Conduit Insert For Optical Fiber Cable”. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention provides a firestopping bushing positional with an aperture defined in a wallboard panel for firestopping around one or more penetrating members such as a cable or wire or multiple cables or wires extending therethrough. The firestopping bushing is made of two half tubular sections. The bushing can also be used extending around cable or wire plugs to facilitate firestopping therearound when positioned in a wall. 
         [0010]    The construction includes a first half section which is generally half tubularly shaped to define a first half bore extending longitudinally therealong. This first half section will include a first interior surface which is generally arcuate and concave to define the first half bore extending longitudinally therealong. The first half section further includes a first exterior surface being generally arcuate and convex positioned spatially disposed from the first interior surface and positioned facing radially outwardly therefrom. 
         [0011]    Further included within the construction of the first half section is a first abutment edge extending longitudinally along the fust interior surface and the first exterior surface and positioned extending therebetween. This first abutment edge will preferably include two separate sections. One section will be defined as the first abutment edge first section which extends longitudinally along the first interior surface and first exterior surface and is positioned extending therebetween. The first abutment edge further includes a first abutment edge second section extending longitudinally along the first interior surface and the first exterior surface and is positioned extending therebetween at a position spatially disposed from the first abutment edge first section with the first half bore positioned therebetween. 
         [0012]    The first half section further includes a first head end defining a first head opening therewithin in fluid flow communication with the first half bore. A first insertion end is defined on the first half section which itself defines a first insertion opening therein in fluid flow communication with respect to the first half bore and with respect to the first head opening. The first half section will also include a first head flange section extending radially outwardly from the first exterior surface at the first head end thereof. The first half section will also include at least one or more first barbs extending outwardly from the first exterior surface to facilitate engagement thereof with respect to a wallboard panel responsive to positioning of the first half section within a wallboard aperture. 
         [0013]    A first firestopping sealing section will be included of flexibly resilient firestopping material positionable within the first half bore of the first half section such that it includes a first sealing section arcuate surface positionable in abutment with respect to the first interior surface to facilitate retaining of the first firestopping sealing section within the first half bore. The first firestopping sealing section will also include a first sealing section planar surface oppositely positioned from the first sealing section arcuate surface and positioned in direct flexibly resilient abutment with respect to any penetrating members positioned extending through the firestopping bushing to facilitate firestopping sealing therearound. 
         [0014]    The bushing of the present invention will further include a second half section which is generally half tubularly shaped to define a second half bore extending longitudinally therealong. The second half section and the first half section will be attachable in abutment with respect to one another to position the first half bore and the second half bore adjacently together and in full fluid flow communication with respect to one another to define a central bore extending axially and longitudinally through the firestop bushing. 
         [0015]    The second half section further includes a second interior surface which is generally arcuate and concave to define the second half bore extending longitudinally therealong. Also included is a second exterior surface defined to be generally and convex positioned spatially disposed from the first interior surface and positioned facing radially outwardly therefrom. 
         [0016]    The second half section further includes a second abutment edge extending longitudinally along the second interior surface and the second exterior surface and being positioned extending therebetween. This second abutment edge includes two sections. Initially it includes a second abutment edge first section extending longitudinally along the second interior surface and the second exterior surface and being positioned extending therebetween. The second abutment edge first section of the second half section is positionable in abutment and engagement with the first abutment edge second section of the first half section to facilitate abutting engagement therebetween. The second abutment edge further includes a second abutment edge second section extending longitudinally along the second interior surface and the second exterior surface and being positioned extending therebetween at a position spatially disposed from the second abutment edge first section with the second half bore positioned therebetween. The second abutment edge second section of the second half section is positionable in abutment and engagement with the first abutment edge first section of the first half section to facilitate abutting engagement therebetween. 
         [0017]    The second half section will also include a second head end defining a second head opening therein in fluid flow communication with the second half bore. The second head opening and the first head opening are positioned adjacently to define together a main head opening responsive to abutting engagement between the first half section and the second half section. Also defined on the second half section is a second insertion end which defines a second insertion end opening therein in fluid flow communication with respect to the second half bore and with respect to the second head opening. The second insertion opening and the first insertion opening are positioned adjacently to define a main insertion opening responsive to abutting engagement between the first half section and the second half section. 
         [0018]    The second half section further includes a second head flange section extending radially outwardly from the second exterior surface at the second head end. The second head flange section is positioned adjacent to the first head flange section to define a head flange responsive to abutting engagement between the first half section and the second half section. Further included is at least one or more second barbs extending outwardly from the second exterior surface to facilitate engagement thereof with respect to the wallboard panel responsive to positioning of the second half section within the wallboard panel aperture. 
         [0019]    The bushing further includes a second firestopping sealing section of flexibly resilient firestopping material positionable within the second half bore of the second half section. This second firestopping sealing section includes a second sealing section arcuate surface positionable in abutment with respect to the second interior surface to facilitate retaining of the second firestopping sealing section within the second half bore. The second firestopping sealing section also includes a second sealing section planar surface oppositely positioned from the second sealing section arcuate surface and positionable in direct flexibly resilient abutment with the first sealing section planar surface to define a sealing seam therebetween for receiving penetrating members positioned extending therethrough to facilitate firestop sealing therearound. 
         [0020]    The first firestopping sealing section and the second firestopping sealing section are both made of flexibly resilient foam material preferably and also are preferably intumescent. 
         [0021]    One of the unique characteristics of the present invention is that the first half sections and the second half sections are all formed identically with respect to one another thereby eliminating the inventory problem of maintaining two separately configured pieces for the first half section and the second section. Thus, each half section can mutually engage with any other half section to form the bushing of the present invention. 
         [0022]    The first half section can include a first engaging means positioned along the first abutment edge thereof and the second half section can include a second engaging means positioned along the second abutment edge thereof. This first engagement means and this second engagement means can be engageable with respect to one another to retain the first abutment edge of the first half section with respect to the second abutment edge of the second half section. 
         [0023]    In the preferred configuration of the present invention a plurality of latching pins and latching slots will be defined in the first abutment edge and second abutment edge to facilitate respective engagement therebetween. 
         [0024]    Preferably the firestopping bushing first half section and second half section are made of a thermoplastic material and the first and second firestopping sealing sections are both made of a foam intumescent flexibly resilient material. 
         [0025]    It is an object of the firestopping bushing of the present invention to eliminate the extensive labor costs for the sealing around individual cables or small bundles of cables or cable plugs extending through walls. 
         [0026]    It is an object of the firestopping bushing of the present invention to provide an inexpensive bushing or grommet that can be installed into walls for smoke sealing of individual cables or a small bundle of normally not more than three such cables. 
         [0027]    It is an object of the firestopping bushing of the present invention to eliminate the use of sealants or putties that is applied by skilled personnel to seal around individual cables or small bundles of cables or around a cable plug extending through wallboards. 
         [0028]    It is an object of the firestopping bushing of the present invention to provide a means for positioning thereof around a cable that is already extending through a wallboard surface or is about to be placed through an opening extending through a wallboard surface. 
         [0029]    It is an object of the firestopping bushing of the present invention to provide a clean appearance where cables penetrating non-rated gypsum wallboards. 
         [0030]    It is an object of the firestopping bushing of the present invention to include raised ribs or barbs on the external surface thereof to facilitate maintaining of engagement in position with respect to the wall construction. 
         [0031]    It is an object of the firestopping bushing of the present invention to provide a split mechanical shell made of molded thermoplastic or thermosetting material which can facilitate overall firestopping. 
         [0032]    It is an object of the firestopping bushing of the present invention to provide a split mechanical shell which can be made from two identical halves which can be attached with respect to one another about a cable prior to positioning thereof extending through a wallboard or sheetrock construction. 
         [0033]    It is an object of the firestopping bushing of the present invention to include a tapered section on the shell to facilitate insertion thereof in position mounted within gypsum wallboard. 
         [0034]    It is an object of the firestopping bushing of the present invention to severely limit the movement of smoke, flame or hot gases through a wall adjacent to a cable extending therethrough. 
         [0035]    It is an object of the firestopping bushing of the present invention to facilitate firestopping around individual or a small number of relatively small cables utilizing a split foam seal which can include an intumescent component or will be fully functional without the inclusion of an intumescent component. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0036]    While the invention is particularly pointed out and distinctly described herein, a preferred embodiment is set forth in the following detailed description which may be best understood when read in connection with the accompanying drawings, in which: 
           [0037]      FIG. 1  is a perspective illustration of an embodiment of the firestopping bushing of the present invention; 
           [0038]      FIG. 2  is a front plan view of an embodiment of the first half section of the firestopping bushing of the present invention; 
           [0039]      FIG. 3  is a front plan view of an embodiment of the second half section of the firestopping bushing of the present invention; 
           [0040]      FIG. 4  is a side perspective view of the embodiment as shown in  FIG. 1  showing the firestopping bushing in position after placement of the first half section and the second half section in mutual engagement surrounding a cable, wire or plug; 
           [0041]      FIG. 5  is a side plan view of the embodiment of  FIG. 4  shown positioned in engagement with respect to wallboard comprising a single thickness piece of gypsum wallboard of standard thickness with barbs engaging the rear wallboard surface; 
           [0042]      FIG. 6  is an illustration of the embodiment shown in  FIG. 4  shown positioned extending through a wall formed of two separate abutting pieces of gypsum wallboard of standard thickness with barbs engaging the rear surface of the rearmost wallboard surface; 
           [0043]      FIG. 7  is cross-sectional view of the embodiment shown in  FIG. 5 ; 
           [0044]      FIG. 8  is a perspective illustration of a first tubular half section with a first firestopping sealing section positioned within the first half bore thereof; 
           [0045]      FIG. 9  is a perspective illustration of an embodiment of a second tubular half section of the firestopping bushing of the present invention; 
           [0046]      FIG. 10  is a side plan view of the firestopping bushing of the present invention showing the first half section and second half section in full abutting engagement; 
           [0047]      FIG. 11  is an side plan view of an embodiment of the first tubular half section of the split mechanical shell of the firestopping bushing of the present invention; and 
           [0048]      FIG. 12  is a side cross-sectional view of an embodiment of the present invention shown firestopping around a cable or wire plug. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0049]    The present invention provides a generally inexpensive and easy to use firestopping bushing for use in placement in a wallboard panel  10  by placement into an aperture  12  through which a penetrating member such as a cable or wire or multiple small cables or wires  14  can extend. The bushing can also be placed surrounding a wire or cable plug  15  as shown in  FIG. 12 . The bushing is configured in two half sections including a first half section  16  and a second half section  46 . The two half sections  16  and  46  can be secured with respect to one another to form the final bushing configuration. 
         [0050]    Each half section is configured preferably identically. In particular the first half section  16  includes a first half bore means  18  extending longitudinally therealong and a first interior surface  20  being generally concave and defining the first half bore means  18  therewithin. The first half section  16  will also define a first exterior surface  21  facing radially outwardly and spatially disposed from the first interior surface  20 . Extending therebetween is a first abutment edge  22  including a first abutment edge first section  24  and a first abutment edge second section  26  as shown best in  FIG. 2 . The first half section will include a first head end  28  which head end defines a first head opening means  30  therewithin. At the opposite end of the first half section  16  a first insertion end  32  is defined. First insertion end  32  defines a first insertion end opening means  34  therein. A first head flange section  36  is positioned at the first head end  28  of the first half section  16 . 
         [0051]    One or more first barbs  38  are positioned on the first exterior surface  21  as shown best in  FIGS. 1 and 4  for the purpose of engaging the wallboard panel  10  and in particular engaging the rear surface thereof as shown best in  FIGS. 5 ,  6  and  7 . Preferably multiple first barbs  38  will be included such that use of the device of the present invention is possible with wallboard panels  10  of varying thicknesses. An example of such varying thicknesses is shown in  FIGS. 5 and 6  which depict a single thickness and double thickness wallboard panel  10 , respectively. A first firestopping sealing section  40  is defined positionable within the first half bore means  18  of first half section  16 . This first firestopping sealing section  40  is preferably made of a firestopping material preferably in a foam format and preferably including an intumescent component to facilitate firestopping. The first firestopping sealing section  40  defines a first sealing section arcuate surface  42  adapted to abut the first interior surface  20  of the first half section  16  and in this manner be positioned within the first half bore means  18 . A first sealing section planar surface  44  is also defined by the first firestopping sealing section  40  for the purpose of being positioned in abutting flexibly resilient engagement with respect to one or more penetrating members  14  extending through the first half bore means  18 . 
         [0052]    In a similar configuration as shown best in  FIG. 3  a second half section  46  may define a second half bore means  48  extending longitudinally therealong. In the preferred configuration of this invention the first half section  16  and the second half section  46  are designed to be brought into abutting engagement with respect to one another by abutment of the first abutment edge  22  of first half section  16  and the second abutment edge  54  of the second half section  46 . With second abutment edge  54  in abutment and engaged with respect to the first abutment edge  22  the first half bore means  18  and the second half bore means  48  will be positioned in abutment with respect to one another and will define a central bore means  50  extending along the bushing configuration in position between the first half section  16  and the second half section  46 . 
         [0053]    The second half section  46  will preferably include a second interior surface  52  which defines the second half bore means  48  extending therealong. The second half section  46  will also include a second exterior surface  53  facing radially outwardly from the second interior surface  52  and spatially disposed therefrom. The edges extending between the second exterior surface  53  and the second interior surface  52  will comprise the two sections of the second abutment edge  54 . In this manner the second abutment edge  54  includes a second abutment edge first section  56  and a second abutment edge second section  58  each of which will extend between the exterior surface  53  and the second interior surface  52  and be spatially disposed from one another as shown best in  FIG. 3 . 
         [0054]    The second half section  46  will define a second head end  60  which defines a second head end opening  62  therewithin. When the first half section  16  and the second half section  46  are in abutment with respect to one another the first head opening means  30  and the second head opening means  62  will be positioned in abutment with respect to one another to define a main head opening means  64  therebetween. 
         [0055]    The second half section  46  will also define a second insertion end  66  preferably at the opposite end from the second head end  60 . This second insertion end  66  will define a second insertion end opening means  68 . When the first half section  16  and the second half section  46  are engaged in abutment with respect to one another with the first abutment edge  22  in engaging abutment with respect to the second abutment edge  54  the second insertion end opening means  68  will be positioned adjacent to the first insertion end opening means  34  such as to mutually define the main insertion opening means  118 . The main opening means  118  will preferably be in full fluid flow communication with respect to the central bore means  50  and with respect to the main head opening means  64 . With this configuration the overall shape of the bushing of the present invention will be generally cylindrical with the outer cylindrical surface formed by the first exterior surface  21  and the second exterior surface  53 . This cylindrical shape will define a central bore means  50  extending axially downwardly therethrough from a main head opening means  64  at the first head end  28  and the second head  60  and will continue to the first insertion end  32  and the second insertion end  66  to the main insertion opening means  118 . In this manner the central bore  50  will extend completely through the bushing to define an area for retaining of the firestopping sealing sections. 
         [0056]    The second half section  46  will also include a second flange section  70  at the head end thereof which will be positionable adjacent to the first head flange section  36  when the first half section  16  and the second half section  46  are joined to one another to define a head flange  72 . This head flange  72  will extend outwardly from the first half section  16  and the second half section  46  to limit the depth of penetration of the bushing into the aperture  12  formed in the wallboard panel  10 . 
         [0057]    One or more second barbs  74  are positioned extending outwardly from the second exterior surface  53  of the second half section  46  to facilitate engagement with respect to the wallboard panel  10  when the second half section  46  is positioned within the aperture  12  defined in panel  10 . 
         [0058]    A second firestopping sealing section  76  is included in the construction of the bushing of the present invention. Second firestopping sealing section  76  includes a second sealing second arcuate surface  78  positionable in abutting engagement with respect to the second interior surface  52  of the second half section  46  to facilitate retaining of the second firestopping sealing section  76  within the second half bore  48  in direct abutment with the second interior surface  52 . Second firestopping sealing section  76  also defines a second sealing section planar surface  80  oppositely positioned on the second firestopping sealing section  76  from the second sealing section arcuate surface  78  and adapted to engage penetrating members  14  extending through the central bore  50  of the bushing of the present invention. 
         [0059]    In the preferred configuration of the present invention the second sealing section planar surface  80  will be in direct abutment with respect to the first sealing section planar surface  44  in such a manner as to define a sealing seam  116  therebetween. This seam is designed to receive the penetrating member or members  14  extending therethrough as they pass through the central bore  50  to facilitate firestop sealing therearound. 
         [0060]    The first half section  16  of the present invention includes a first engaging means  82  and the second half section  46  includes a second engaging means  84 . Engaging means  82  and  84  are adapted to engage one another to facilitate engagement of the first half section  16  and the second half section  46  with respect to one another with the first abutment edge  22  in engagement with respect to the second abutment edge  54 . The preferable manner of engaging the first abutment edge  22  with respect to the second abutment edge  54  is engaging of the first abutment edge first section  24  with respect to the second abutment edge second section  58 . Similarly the first abutment edge second section  26  is preferably designed to be attached with respect to the second abutment edge first section  56 . This manner of engagement by choosing the appropriate configuration for both the first engaging means  82  and the second engaging means  84  allows the construction of the present invention to be made wherein the first half section  16  and the second half section  46  are of identical constructions. That is, they are made as the same part and only are at a later time defined as the first half section  16  and the second half section  46  and in this manner only one inventory identification need be made and only one mold need be made in order to form both the first half section  16  and the second half section  46 . 
         [0061]    With this construction the configuration of the engaging means includes a first latching pin  86  and a first latching slot  88  defined on the first abutment edge first section  24 . In the configuration shown in  FIG. 2  the first latching pin  86  will be closer to the first head end  28  of first half section  16  and the first latching slot  88  will be further distant therefrom spatially disposed away from the first latching pin  86 . In this manner the first latching slot  88  will be closer to the first insertion end  32  thereof. To facilitate engagement the first latching pin  86  will include a first latching pin shoulder  87  and the first latching slot  88  will include therein a first latching slot shoulder  89 . The first abutment edge first section  24  is designed to engage with respect to the second abutment edge second section  58 . A fourth latching pin  98  and a fourth latching slot  100  are defined on the second abutment edge second section  58 . The positioning of the fourth latching pin  98  and the fourth latching slot  100  is opposite from the relative positioning of the similarly shaped pin and slot defined on the first abutment edge first section  24  to facilitate engagement therebetween. That is, the fourth latching pin  98  will be closer to the second insertion end  66  whereas the fourth latching slot  100  will be closer to the second head end  60 . In this manner when the first abutment edge first section  24  is positioned in abutment with respect to the second abutment edge second section  58  the first latching pin  86  will extend into the fourth latching slot  100  for engagement therewith. The fourth latching slot  100  will define a fourth latching slot shoulder  101  which is adapted to engage with respect to the first latching pin shoulder  87  of first latching pin  86  to facilitate engagement therewith. 
         [0062]    Similarly when the first abutment edge first section  24  is in abutting engagement with respect to the second abutment edge second section  58  the fourth latching pin  98  will be positionable extending into the first latching slot  88  in such a manner as to be engageable therebetween. Fourth latching pin  98  will define a fourth latching pin shoulder  99  therewithin adapted to engage with respect to the first latching slot shoulder  89  in such a manner as to facilitate engagement between the first latching slot  88  and the fourth latching pin  98 . 
         [0063]    When the first half section  16  is positioned in abutment with second half section  46  to facilitate engagement therebetween the first abutment edge second section  26  will be in abutting alignment and engagement with respect to the second abutment edge first section  56 . To facilitate detachable engagement therebetween a plurality of slots and pins are positioned on these two surfaces similar to the configuration described above in regard to the first abutment edge first section  24  and the second abutment edge second section  58 . 
         [0064]    For this purpose a second latching pin  90  will extend outwardly from the first abutment edge second section  26 . Second latching pin  90  preferably includes a second latching pin shoulder  91  thereon to facilitate engagement with respect thereto. The first abutment edge second section  26  further defines a second latching slot  92  therein which includes a second latching slot shoulder  93  therewithin to facilitate engagement therewith. On the first abutment edge second section  26  the second latching slot  92  will be closer to the second head end  60  and the second latching pin  90  will be positioned closer to the second insertion end  66 . The second latching pin  90  and the second latching slot  92  will be separated from one another with similar spacing as on each of the sections of the different firestopping sealing sections. 
         [0065]    As shown in  FIG. 3  the second abutment edge first section  56  will include a third latching pin  94  defined thereon with a third latching pin shoulder  95  defined by pin  94 . The second abutment edge first section  56  will also include a third latching slot  96  therein with a third latching slot shoulder  97  defined therewithin. 
         [0066]    When the first half section  16  and the second half section  46  are positioned in abutment with respect to one another the second latching pin  90  will be in registration and aligned with the third latching slot  46  such that the second latching pin shoulder  91  can engage with respect to the third latching slot shoulder  97  to facilitate engagement between second latching pin  90  and third latching slot  96 . Simultaneously the third latching pin  94  will be in alignment with respect to the second latching slot  92  such that the third latching pin shoulder  95  can engage the second latching pin shoulder  93  for engaging third latching pin  94  within the second latching slot  92 . 
         [0067]    In this manner full engaging abutment will be achieved firstly between the first abutment edge first section  24  and the second abutment edge second section  58  as well as between the first abutment edge second section  26  and the second abutment edge first section  56 . It should be appreciated that by reversing the position of the pin and the slot on the first and second sections of each half section, both the first half section  16  and the second half section  46 , it is possible to use the same identical piece as the first half section and the second half section which provides obvious substantial savings in both inventory costs and mold costs. 
         [0068]    Preferably the first half section  16  will include a first head retaining rim  102  adjacent the first head end  28  and a second head retaining rim  104  will be positioned adjacent the second head end  60  of second half section  46 . The first head retaining rim  102  and the second head retaining rim  104  will both extend to a very small extent into the main head opening means  64  for the purpose of retaining the first firestopping sealing section  40  and the second firestopping sealing section  76  within the central bore means  50 . 
         [0069]    In a similar manner the first half bore means  18  will define a first insertion retaining rim  106  extending slightly into the first half bore means  18  thereof. Similarly the second half section  46  will define a second insertion retaining rim  108  extending slightly or to a very limited distance into the second half bore means  48 . As such, the first insertion retaining rim  106  and the second insertion retaining rim  108  will both extend slightly into the main insertion opening means  118  which will further facilitate retaining of both the first firestopping sealing section  40  and the firestopping sealing section  76  within the central bore  50 . 
         [0070]    To facilitate maintaining alignment between the first abutment edge first section  24  and the second abutment edge second section  58  and between the first abutment edge second section  26  and the second abutment edge first section  56  a plurality of alignment pins  110  are included along with a plurality of alignment apertures  112  which are registrable with respect to one another and facilitate maintaining relative registration and alignment between the first half section  16  and the second half section  46  when in abutment with respect to one another. 
         [0071]    Insertion of the bushing of the present invention is facilitated by the defining of a bevel  114  at the first insertion end  32  of the first half bore means  18  and at the second insertion end  66  of the second half section  46  which greatly facilitates ease of placement thereof within an aperture  12  defined in the wallboard  10 . 
         [0072]    As such, in use, two separate half sections are provided one of which is defined to be the first half section  16  and the other of which is defined to be the second half section  46 . The penetrating wire or cable  14  is placed in abutment with the exposed first sealing section planar surface  44  of first half section  16  and the second sealing section planar surface  80  exposed on second half section  46 . With the penetrating member  14  held flexibly resiliently in abutment with respect to these two planar sections, the first half section  16  is positioned in abutment for engagement with respect to the second half section  46  thereby capturing the penetrating member or members  14  therebetween within the sealing seam  116 . This formed cylindrical bushing with the head flange  72  can then be pressed into the aperture  12  defined in the wallboard  10  until the bottom portion of the head flange  72  contacts the outer surface of the wallboard panel  10 . In this manner the bushing is finally positioned in the wall and firestopping is achieved in a simple and convenient manner and use is made possible wherein a wire is already placed extending through the wall and firestopping can be achieved in an after market fashion in a quick and expedient manner with respect to wires already existing extending through walls and wallboard panels  10 . 
         [0073]    It is fairly common to position wire or cable plugs  15  within wallboard panels  10 . The bushing of the present invention is very useful in firestopping around such a plug  15  while also affixing the plug in position extending through the wallboard  10  securely as shown in  FIG. 12 . 
         [0074]    While particular embodiments of this invention have been shown in the drawings, described above and claimed herein, however it will be apparent that many changes may be made in the form, arrangement and positioning of the various elements of the combination. In consideration thereof, it should be understood that preferred embodiments of this invention disclosed herein are intended to be illustrative only and not intended to limit the scope of the invention.