Abstract:
A prefabricated insulation panel including a face member of imperforate sheet material having a top flange with an upright attaching flange at the rear thereof, an inside foot flange spaced above the bottom edge of the face member defining a lapping bottom portion, and insulation material received and retained against the inside of the face member between the top flange and foot flange.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to a building panel, and more particularily to a prefabricated insulation panel. 
     Heretofore insulation panels have been developed including thick insulation materials sandwiched or laminated between a pair of outer sheet or skin members. However, the means for securing the panels to the outside of the building structure incorporate screws or nails which penetrate the skins as well as the insulating members. The punctured holes in the panels thus create deformed panels, deterioration of the insulating material, and some loss of thermal insulating quality. 
     These disadvantages are particularily apparent in insulating panels used in the insulation of heating apparatus, such as large boilers, boiler auxiliary components and heating ducts. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of this invention to provide a prefabricated insulation panel of more stable structural qualities and better adapted for assembly, than previous insulation panels. 
     The insulation panel made in accordance with this invention includes a face member of imperforate sheet material, such as sheet metal, having a top flange integrally formed with and projecting from the rear edge of the face member and terminating in an upstanding attaching flange. The bottom portion of the face member includes an inwardly upturned portion defining a foot flange projecting rearward from the face member and spaced above the turned bottom edge, the foot flange being connected by the upturned integral portion of the face member to the bottom edge. An insulation member or pad of corresponding configuration is fitted against the rear surface of the face member between the top flange and the foot flange, and held in position by any convenient securing means. The bottom portion of the face member between the foot flange and the bottom edge forms a lapping portion adapted to overlap the top portion of the face member of a subjacent panel, while the foot flange rests upon the top flange of the subjacent panel. The attaching flange is preferably in vertical alignment with the rear of the panel and projects above the panel, so that it may be easily attached to the structure covered by the panels. 
     The overall coverage of the imperforate sheet material of not only the face member but the top flange, foot flange and the connecting flange, is more than adequate protection of the insulation material from weather and mechanical damage, as well as protection of the interior of the covered structure from the weather. 
     The foot flange not only forms a ledge for seating against the top flange of the subjacent panel, and for accurate spacing of the panels, but also protects the insulation material from any creeping moisture which might penetrate beneath and inside the overlapping bottom portion. 
     The top flange, being equal to the depth of the panel, forms a self reinforcing web to strengthen the panel against external force or pressure, particularily when used horizontally, such as a roof panel. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a fragmentary front elevation of a pair of overlapping panels made in accordance with this invention; 
     FIG. 2 is a fragmentary rear elevation of the panels disclosed in FIG. 1, with portions broken away; 
     FIG. 3 is an enlarged view taken along line 3 -- 3 of FIG. 2; 
     FIG. 4 is a fragmentary rear perspective view, with portions broken away, of a panel made in accordance with the invention disclosed in FIGS. 1 - 3; 
     FIG. 5 is a fragmentary rear perspective view of a modified panel, with the insulation pad shown in phantom. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to the drawings in more detail, FIGS. 1, 2 and 3 disclose a pair of panels 10 and 11 assembled in overlapping relationship upon a stiffener member 12 of a large heating duct 13, for example, fragmentarily shown in FIGS. 1 and 3. 
     As best disclosed in FIGS. 3 and 4, the upper panel 10 is formed of a rectangular-shaped, flat face member 14 of imperforate sheet material, such as galvanized steel or aluminum. The sheet metal, from which the face member 14 is constructed, is preferably bent approximately 90° to form the top edge 15 and projects rearward the full depth of the panel 10 to form the top flange 16. The metal is bent upward at the crease 17 to form an elongated upstanding attaching flange 18, substantially in the plane of the rear face of the panel 10. 
     In the preferred form of the invention, the bottom edge 19 of the face member 14 is formed by turning the sheet material, from which the face member 14 is made, back upon itself to form an upward projecting connecting flange 20, which is then turned at the crease 21 to project rearward as the foot flange 22. Thus, as clearly illustrated in FIG. 3, the connecting flange 20 and the bottom lapping portion 23 of the face member between the foot flange 22 and bottom edge 19 overlap the upper portion of the face member 14 of the subjacent panel 11. 
     Fitted within the interior space of the panel 10 formed by the top flange 16, face member 14 and foot flange 22, is a rectangular pad 24 of insulating material. The insulating material pad 24 may have its rear face covered with the reflective foil 25, such as aluminum foil, held in place by the wire grid 26, if desired. 
     To hold the insulating pad 24 in its insulating or operative position within the panel 10, metal straps 28 may be rigidly secured to the back of the attaching flange 18, by fasteners, or by welding, and bent at their lower ends to form the hook members 29 having depending flanges 30 for wedging between the adjacent lapping portions 20 and 23. 
     As best illustrated in FIG. 3, when a panel 10 is mounted in assembled position on top of the next lower or subjacent panel 11 of identical construction, the foot flange 22 seats flush upon the top flange 16&#39; of the lower panel 11 with the overlapping flange 20 abutting flush against the upper portion of the face member 14&#39;. The depending flange portions 23 and 20 are firmly secured to the upper portion of the lower panel 11 by an appropriate bolt or screw fastener 32. 
     The upper attaching flange 18 is easily secured to the stiffener 12 by inserting a threaded fastener 33 therethrough. It will be noted in FIG. 3 that the threaded fastener 33 penetrates only the attaching flange 18, and possibly the upper extension of the metal foil backing 25, but does not penetrate the interior space which accomondates the insulating pad 24. Moreover, the lower fastener 32 does not penetrate any portion of the interior space of the panel 10, or the insulating pad 24 in panel 10. Although the lower fastener 32 does penetrate the face member 14&#39; and a portion of the insulating material behind face member 14&#39;, nevertheless, the aperture created by the penetration is covered by the depending flange portions 20 and 23 and by the head of the fastener 32. Furthermore, in some installations, the lower fastener 32 may be eliminated. 
     Moreover, the fasteners 32 and 33 are easily installed, because the portion of the panel 10 to which they are attached are exposed during installation. Furthermore, when the next panel is placed on top of the panel 10, the lower portion of the upper panel hides the upper fastener 33 in panel 10, and protects it from the weather. 
     Although the foot flange 22 could project rearward farther than it does in FIG. 3, nevertheless, the rear edge of foot flange 22 preferably terminates a distance substantially forward of the rear face of the panel 10, to minimize heat conduction from the heating duct 13 and the stiffener 12. Since the sheet material from which the face member 14 and the foot flange 20 are made will more than likely be a heat conductive metal, the fore-shortened foot flange 22 is preferred. 
     If the heat transfer through the panel is a particular problem, then its structure may be modified to form a panel such as 40, illustrated in FIG. 5. In the panel 40, the face member as well as the insulating pad 54, are identical to their counterparts in panel 10. However, the top flange 46 is fore-shortened, that is, it is not as wide as the thickness of the panel 40, in order to minimize heat-conducting contact with the heating duct 13 or stiffener 12, upon which the panel 40 might be secured. Accordingly, the upstanding attaching flange 48 is secured to the top flange 46 by a forwardly projecting bracket or strap 60 secured by appropriate fastener 61. Thus, the combined depth of the top flange 46 and the bracket strap 60 equals the thickness of the panel 40 to provide the self-reinforcing rigidity to the panel 40. In other words, the bracket strap 60 forms an extension of the top flange 46 with less heat conductiveness than the solid top flange 16. The insulating retainer strap 58 has the same lower structure as the strap 28, but its top edge is bent forward to form a flange 62, secured by means such as welding to the bottom portion of the top flange 46. 
     It would therefore be apparent that any of the panels 10, 11 or 40 are not only unitary and compact but are structurally stable, as well as providing a more adequate coverage of the insulating pads 24 for maximum weather and mechanical protection. A limited number of fasteners 32 and 33 are provided for firmly securing the panels 10 and 11 to structural members such as 12 so that the assembly is not only rapid but simple. Moreover, the overlapping relationship of the vertical panels 10 and 11 provides protection of the structure to which the panels are secured from the weather and from damage from many types of external objects. 
     Because of the relative dimensions, location and structure of the top flanges 16, 16&#39; and 46, and the foot flanges 22 and 52, the panels 10, 11 and 14 are self-reinforcing, self-aligning and esthetically pleasing.