Abstract:
An improved construction panel is diclosed comprising a foam core with thin metal skins attached to top and bottom surfaces of the foam core having am improved snap together joint. The joint includes a sealant pocket and stabilizing members. The sealant pocket further includes a bead or a protrusion to positively define a vertical sealant space between adjacent and connected construction panels.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Application No. 60/078,746, filed Feb. 9, 1998 
    
    
     BACKGROUND OF THE INVENTION 
     a) Field of the Invention 
     This invention relates in general to the field of building panels for such use as roofing, interior or exterior walls, even entire buildings and in particular to building panels having an insulating core and structural and/or weather resistant exterior surfaces, said building panels being sealingly joinable along at least one edge. 
     b) Description of the Prior Art 
     Foam core building panels are relatively well known in the prior art. They comprise a sandwich construction having a foam insulating core with structural skins permanently bonded to the exterior surfaces of the foam. Typically, the foam core is approximately three (3) inches thick although a thickness of up to eight (8) inches is becoming increasingly popular. The skins may be aluminum, steel, plywood or any other appropriate structural material. Where the building panels incorporate metal skins, the metal skins average approximately 0.019 to 0.032 inches thick. The outer surfaces may be decorated in any manner conceivable, but typically the metal skins are embossed and painted to present a relatively smooth and aesthetically pleasing appearance. The panels generally average four (4) to eight (8) feet wide by eight (8) to forty (40) feet in length. Of course, these are just typical dimensions which have found acceptance in the building industry. 
     The foam core provides excellent thermal insulating properties while being very light in weight. The exterior skins are permanently bonded to the foam core and even though they are relatively thin they provide a high degree of structural strength to the panels and further provide a surface capable of withstanding severe weather conditions. One can readily imagine the many possible uses for building panels having so many excellent properties. For example, they can be used for walls, both interior or exterior, ceilings, roofs, partitions, tables, doors, columns, building facades, marquees, buildings, etc. However, in the early prior art the foam core building panels have found limited use where they were primarily used for porch roofs and refrigeration buildings. The limited use of the early prior art foam core building panels has been because of the difficulty of joining together adjacent panels and being able to seal the joint. Because of these basic deficiencies, it is understandable that developed uses for the early prior art foam panels was at a standstill. 
     Upon reviewing the early prior art one sees that there are methods and apparatus used to join together adjacent foam core panels and that they are extremely varied. However, virtually none of the early prior art methods and apparatus used to join the panels were or are in commercial usage. The ostensible reason being that the prior art methods and apparatus did not work when applied to actual construction conditions. For example, the relatively long length of the panels in combination with the relatively thin outer surfaces of the panels does not permit precise end configurations, and therefore does not allow the panels to fit together as envisioned in the prior art drawings. The prior art drawings are two dimensional which conceptually provide for a proper joint; but, under construction conditions, the long length of the panels comprises a third dimension which is not provided for in the prior art drawings. Thus, while the prior art configurations might fit together on paper, the fit up along the entire length of the panels could not be accomplished. But of course, for a satisfactory building panel the entire length of all the panels must be capable of being joined and sealed under actual conditions. Then too, many of the early prior art methods and apparatus were too cumbersome or too complicated to be commercially feasible. 
     In the prior art therefore, the primary method used to join panels at the point of assembly or at the construction site was to use metal or vinyl splines which fit between formed and extending metal edges of adjacent panels. The splines extended the full length of the edge of the panels which typically is between eight to twenty feet in length and because of this, it was required that the splines be very loosely fitted. A tightly fitting spline could not be slid along the entire length of the panel, it would jam somewhere along the length when being installed. A pair of splines were usually used at each joined joint; one on one side of the panel and another on the other side of the panel. The procedure would be to place two panels side by side, then to fit a spline between the formed and extending edges of the exterior surfaces of one side of both panels and to insert the spline in the direction of the panel length to progressively join one side of the exterior surfaces. A second spline would then be similarly installed on the other side of the exterior surfaces. But because of the required looseness of the splines, the result would be two joined panels whereby the joint would be loose and not be sealed against the weather. Another major disadvantage of this type of joint (i.e. using splines) is that a significant open space resulted between the ends of the foam cores of the panels. The uninsulated space caused moisture condensation problems on the underside of the joined panels. Moreover, the resulting joint would have little if any structural integrity and would not add to the overall stiffness of the two joined panels. Needless to say, a loose fitting unsealed joint was not a favorable condition. Various attempts were made to insert a bead of caulk or other sealant between the adjacent panel edges to form a weather tight joint but such attempts were mostly unsuccessful because of the necessity to push the spline in the direction of the joint which resulted in disturbing the bead of caulk. 
     In various attempts to overcome the deficiencies of the splined together panel joints, the early prior art discloses sundry designs which are intended to be pushed together to form a joint between adjacent panels. However, as stated above, none of these prior art push together joint designs were commercially successful. They were either to complicated to be manufactured, were too expensive or did not form the intended joint when long panels were attempted to be joined. Thus, in the early prior art, the most widely used method of joining the panels was to use the loose fitting splines however unsatisfactory the resulting joint was. 
     In approximately 1987, the inventor herein conceived, invented, designed and developed mating end configurations for adjacent foam core building panels which successfully overcame the problems of the early prior art and resulted in a snap together joint. That invention changed the foam core panel industry. A subsequent invention improved the snap together joint even more. The use of the splines became obsolete. My inventions snapped together in the field and worked with long panels. Even with these inventions there still were some occasions where the joint was not to this inventor&#39;s satisfaction. The sealing provided by my prior inventions could be improved. The present invention addresses that aspect of my snap together joint. 
     Accordingly a primary object of the present invention is to provide foam construction panels with a push together joint having a positive seal. 
     Another object of the present invention is to provide foam construction panels with a push together joint having a predictable, predetermined vertical and horizontal space between joined panels while minimizing side to side looseness between adjacent panels with or without a sealant being used. 
     The above-stated objects as well as other objects which, although not specifically stated, but are intended to be included within the scope the present invention, are accomplished by the present invention and will become apparent from the hereinafter set forth Summary of the Invention, Detailed Description of the Invention, Drawings, and the Claims appended herewith. 
     SUMMARY OF THE INVENTION 
     The above objects as well as others are accomplished by the present invention which comprises a push together joint for foam construction panels which provides a discrete space between adjacent panels within which a bead of sealant may be placed. A bead or a small curved protrusion is formed into one of the formed end configurations of a panel within the vertical sealing space and between adjacent panels. The bead positively forms and limits the width of the vertical space assuring proper fit up of adjacent panels and proper compression and distribution of the sealant within the sealant space. 
     In accordance with the above, there has been summarized the more important features of the present invention in order that the detailed description of the invention as it appears in the below detailed description of the same, may be better understood. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Various other objects, advantages, and features of the invention will become apparent to those skilled in the art from the following discussion taken in conjunction with the following drawings, in which: 
     FIG. 1 is a perspective illustration of one constructive panel having a foam core with thin metallic exterior surfaces and formed end configurations according to one embodiment of the present invention; 
     FIG. 2 is a partial front elevation of two foam cored construction panels in the process of being fitted together; and 
     FIG. 3 is a partial front elevation view of two foam cored construction panels of FIG. 2 arranged side by side and joined together with a sealant within the formed end configurations according to one embodiment of the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention which may be embodied in various forms. Therefore, specific structural and functioning details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. 
     Reference is now made to the drawings, wherein like the characteristics and features of the present invention shown in the various figures are designated by the same reference numerals. 
     FIG. 1 shows an isometric view of a construction panel  10  made in accordance with one embodiment of the present invention. The panel  10  comprises a foam core  11  which is made from an insulating material which is relatively rigid such as expanded polystyrene. The foam core includes a front surface  12 , a back surface  13  and two side or end surfaces  14  and  15 . Side surface  14  of the foam  11  has a female configuration while side surface  15  of the foam has a male configuration. Side surface  15  is configured such that when adjacent panels are arranged side by side, one foam end fits within the other to form an insulating fit. The foam end configurations may be reversed such that end  15  has a female configuration while end  14  has a male configuration; or, the ends may be straight to result in a butt type of fit up. 
     Referring again to FIG. 1, the top  16  and bottom  17  surfaces of the foam core  11  are covered by metallic cladding  18  and  19  respectively such as aluminum or steel. The metallic cladding  18  and  19  are permanently bonded to the foam core  11 . As can be seen, the end configuration of cladding  18  and  19  at side  14  and  15  of the foam core are formed or shaped such that end  20 A fits within end  21 A and end  20 B fits within end  21 B when adjacent panels  10  are pushed together. 
     Ends  21 A and  21 B each comprises a formed extension of the cladding  18  and  19 , respectively, which are formed to fit against the configuration of the end  15  of the foam core. As such, formed ends  21 A and  21 B each descend at a right angle from the horizontal plane of cladding  18  (or  19 ) toward the horizontal center of foam core  11 , forming edge portion  22 . Ends  21 A and  21 B each then extend at another right angle spaced from but in a direction substanially parallel to the plane of cladding  18  (or  19 ), forming edge  23  portion. Edge  24  portion is formed at another right angle and extents up or away from the horizontal center of foam core  11 , but only for a short distance. Finally end portion  25  extends at a downward angle toward the horizontal center of foam core  11 . Edge portion  25  comprises a ramp or sliding surface. The formation of edge portions  22 ,  23 , and  24  form a groove or channel  26  there between. 
     Ends  20 A and  20 B are formed in the extending ends of cladding  18  and  19  and are configured to mate or fit with ends  21 A and  21 B of an adjacent panel. Ends  20 A and  20 B each comprise a curved portion  31  and a descending edge portion  27 . Curved portion  31  may comprise a configuration having the shape of the letter “C” or that of a semi-circle. Descending edge portion  27  is substancially perpendicular to the plane of cladding  18  or  19  and is connected to the end of the curved portion  31  such that curved portion  31  is the outermost extending portion of formed ends  20 A and  20 B. A horizontal portion  28  is connected to vertical portion  27  and extends back toward the foam of foam core  11 . A short vertical portion  29  and an angled end portion  30  complete the configuration of ends  20 A and  20 B. As seen in FIG. 1 end configurations  20 A and  20 B extend beyond the end  14  of foam  11  in a cantilevered manner, such that ends  20 A and  20 B are capable of elastically bending both away from and toward the horizontal center of foam  11  in a spring-like manner and for purposes explained hereinafter. 
     FIG. 2 illustrates the adjacent ends of two side by side panels  10  being pushed together to form the joint shown in FIG.  3 . The junction of edge portions  27  and  28  on ends  20 A and  20 B first contact the inclined surfaces of edge portions  25  on ends  21 A and  21 B. Further pushing causes the interaction of the contacting surfaces to resiliently bend ends  20 A and  20 B slightly outward due to the inclined configuration of edge portion  25  and over the junction of edge portions  24  and  25 . Then ends  20 A and  20 B resiliently bend back to their original configuration but within the grooves  26  as shown in FIG.  3 . 
     Ends  20 A and  20 B, and  21 A and  21 B are configured to provide a discrete “L” shaped space  32  between the mating ends when two adjacent panels  10  are fully pushed together as shown also in FIG.  3 . Discrete spaces  32  provide the space necessary to fit there within a bead of a sealant  33  such as caulk. It is to be noted that the sealant  33  is applied to grooves  26  just prior to the assembly of two adjacent panels  10  as shown in FIG.  2 . The resilient cantilever action of ends  20 A and  20 B push down on the bead of sealant  33  causing the same to spread out and fill the discrete space  32 , and provide a weather tight seal between adjacent panels. 
     The extending curved end portions or protrusions  31  form stops which limit the amount of horizontal distance that ends  20 A and  20 B fit within ends  21 A and  21 B and/or limit the amount that the two side by side panels can be pushed together. Curved, protrusions  31  therefore limit the vertical side to side clearance of the formed edge between mating adjacent panels. Accordingly, the vertical portion of sealant space  32  is dependent upon the mating fit up of vertical edge portions  27  of ends  20  with vertical edge portions of  22  of ends  21  as dictated by the amount of distance that protruding portion  31  extends beyond edge portion  27 . In this manner a more precise vertical portion of sealant space  32  results. It is simply a matter of pushing adjacent panels together until the ends  20 A and  20 B snap into place within grooves  26  and until protrusions  31  contact vertical edge portions  22  thereby limiting any further side travel. Moreover, the overall width of multiple, assembled side by side panels  10  may now be more closely controlled to provide a more accurate overall fit up at the construction site. The horizontal portion of the discrete sealant space  32  is controlled by a number of factors with one primary factor being the formed edge portions  23  and  28 , i.e. the as formed distance between sail edge portions when two side by side panels are pushed together. Since edge portion  23  fits against a machined groove in the foam core, the location of edge portion  23  is very accurately fixed. While edge portion  28  is suspended from the planar surface of cladding  18  or  19 , it comprises a portion which lends itself to relatively accurate positioning during forming operations. A properly sized horizontal portion of sealant space  32  is further provided by the mating fit-up of inclined surfaces  25  and  30 . The mating fit up of inclined surfaces  25  and  30  provide a further benefit comprising the stabilization and centering of adjacent panels at the time of assembly and thereafter. That is, that the two side by side panels are positioned in the same horizontal plane with the top and bottom clad surfaces in substantial horizontal alignment and each inclined surface  30  limits the vertical motion of adjacent and joined panels due to interference with the inclined surface  25  or the opposite side of the joint. The result is that a desired, predetermined sized, sealant space is provided and the outer surfaces  18  and  19  of the panels  10  are properly aligned and stabilized when the panels are joined. 
     While the invention has been described, disclosed, illustrated and shown in certain terms or certain embodiments or modifications which it has assumed in practice, the scope of the invention is not intended to be nor should it be deemed to be limited thereby and such other modifications or embodiments as may be suggested by the teachings herein are particularly reserved.