Patent Publication Number: US-2007094954-A1

Title: Corrosion resistant window shutter

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
      This application is a continuation of U.S. application Ser. No. 10/929,846 filed Aug. 30, 2004, which is a continuation of U.S. application Ser. No. 10/134,353 filed Apr. 27, 2002, on which the present application is based and benefit claimed under 35 U.S.C. §119(e), are herein incorporated by reference. 
    
    
     FIELD OF THE INVENTION  
      This invention relates to window shutters.  
     BACKGROUND OF THE INVENTION  
      Exterior window coverings, such as window shutters, have been used for many years. Window shutters are positioned over glass windowpanes to protect the glass windowpanes from flying objects that can damage, or break, the glass, and enter the building. Window shutters may be used to secure a building against break-ins, and may be used to block sunlight from entering the building through the windowpane. The window covering, or shutter, may be pivoted away from the windowpane to lie flat against the building. When the shutter is pivoted away from the windowpane, it enhances the beauty and appearance of the building. Alternatively, the window shutter may be purely decorative.  
      There is a need to provide a window shutter that will pass missile tests that have been established by testing agencies to judge a material&#39;s ability to withstand and retard flying objects. The window shutter should also be able to perform successfully in commonly used wind load tests, which judge a material&#39;s ability to withstand stresses from continuous wind loads.  
      There is also a need for an window shutter that will not require substantial maintenance in adverse conditions. In particular, there is a need for a window shutter which will remain relatively maintenance free in hostile environmental conditions, such as the tropics and subtropics, where direct sunlight exposes the window covering to substantial heat, humidity, and ultraviolet rays from the sun. Further, these environments are typically near salt water, and the salt air contributes to the deterioration of building materials. Still further, these tropical and subtropical environments may experience frequent hurricanes, which means that the substantially maintenance free window covering is exposed to high winds and wind driven water.  
     SUMMARY OF THE INVENTION  
      The present invention is a window shutter that is comprised of a corrosion resistant stile and non-metallic core and louvers. The device is resistant to the adverse effects of sunlight, humidity, rain and wind, and will retard flying objects, and will pass a missile test. The resulting shutter will also withstand substantial stresses from wind loads, so as to perform satisfactorily in wind load tests. The window covering of the invention is substantially maintenance free. 
    
    
     DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a perspective view of the window shutter of the present invention.  
       FIG. 2  is a partial view of the window shutter, with some of the louvers removed from the slots in the core.  
       FIG. 3  is a partial view of the top of the window shutter. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      The window shutter of the preferred embodiment has a pair of stiles  6 ,  8  attached along each of the parallel sides of the shutter that represent the vertical length of the shutter. The stile is preferred to be generally U-shaped, and comprised of three sides. The stile is formed of a rigid corrosion resistant material, and is preferred to be a metal, such as aluminum. A first side  10  of the stile is generally parallel to a second side  12  of the stile.  
      A first vertical core  2  is positioned within stile  6 , and a second vertical core is positioned within stile  8 . The first core and the second core are positioned generally vertically, and are contained within their corresponding stiles. A top rail  14  extends generally horizontally between the stiles  6 , 8  and a bottom rail  16  extends generally horizontally between the stiles. The cores and rails may be formed of multiple layers of material, or a single layer of material.  
      In the preferred embodiment, the core and rails are formed of polyvinyl chloride (PVC).  
      The top rail as shown in  FIG. 3  may be formed of two layers of material  18 ,  20 , which may be glued together using cement that is appropriate for PVC. The bottom rail may be similarly formed. The top and bottom rails may be of a reduced dimension on a portion of the outer surface thereof so as to engage the stiles, while maintaining a constant thickness for the perimeter of the shutter when measured at the center of the top and bottom rails and at the stiles.  
      Alternatively, the top rail may engage a void formed in the each of the vertical rails for receiving the top rail, rather than engaging the stile directly. The bottom rail may similarly engage a void formed in a lower portion of the vertical cores. The rails may be glued within the voids with an appropriate cement.  
      As shown in  FIG. 2 , the vertical cores that engage the stiles have a plurality of grooves  16  that are formed generally parallel to each other, and on a desired angle. Each groove of each vertical core corresponds to a groove in the opposite vertical core. Louvers  24  are mounted in each pair of corresponding grooves, so that the void that is present between the top rail, the bottom rail and the vertical cores is covered with the louvers, as shown in the drawing figures.  
      In the preferred embodiment, the cores have a rectangular cross section, so that the core has four sides. Three of the sides engage, and are entirely surrounded by the three sided, or U-shaped, stile. The fourth side comprises the plurality of grooves into which the louvers are inserted.  
      The stiles may have one or more tongues  22  that fit into grooves that are formed in the rails, and/or in the cores.  
      The combination of a corrosion resistant metal, such as aluminum, with the core, rails and louvers formed of PVC results in a window shutter that is corrosion resistant and may be used in salt air and other hostile environments with minimal maintenance. The resulting shutter is surprisingly resistant to wind propelled missiles, and will withstand hurricane level wind forces and wind driven water when constructed to dimensions that are normal for wooden shutters.  
      The core and rails may be formed in varying materials as desired, such as white, dark green, or black, or any other color desired. Alternatively, the shutter may be painted to any color desired.  
      The shutters are attached to a building, or to a window frame. The shutters may be attached by pivotal means, such as hinges, so that the shutter may be positioned over a window, or away from a window, as desired.