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CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the priority of Colombia Patent Application No. 13-132434, filed on 30 May 2013, in the Colombia Patent Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND 
       [0002]    The inventive concept relates to a safety window for hurricane protection and crime prevention, and more particularly to a safety window for hurricane protection and crime prevention, which can prevent a window from damage due to a hurricane and prevent an outsider from trespassing through the window. 
         [0003]    To protect life and property from losses due to the hurricane, a window or door is provided with a detachable hurricane protection shutter. 
         [0004]    Such a hurricane protection shutter has a structure that plywood, plastic, metal or the like plate is fastened to and fully seals up the window or door, thereby completely blocking out light and air flow from an inside of a building. 
         [0005]    That is, although the conventional hurricane protection shutter is effective to protect the window from the hurricane, it cannot give light and air to the inside of the building in a situation that the hurricane cuts off electricity, thereby making the inside of the building dark and causing poor ventilation. 
       SUMMARY OF THE INVENTION 
       [0006]    The inventive concept provides a safety window for hurricane protection and crime prevention, which can give light and fresh air to an inside of a building through an open window as well as preventing a window from damage due to a hurricane and preventing an outsider from trespassing through the window. 
         [0007]    According to an aspect of the inventive concept, there is provided a safety window for hurricane protection and crime prevention, the safety window including: an external frame which has a window shape and is installed in a window frame of a wall of a building; an internal frame which is coupled to the external frame; and a protection screen which includes a plurality of holes to prevent an outsider from trespassing but allow air to pass therethrough, couples with the external and internal frames, and protects a window. 
         [0008]    The external frame may include a holding groove in which the internal frame is inserted and arranged; and a hooking projection which prevents the internal frame from separating from the holding groove, and the internal frame may include a supporting projection hooked to and supported on the hooking projection. 
         [0009]    The external frame may include: a horizontal frame; a vertical frame connected to the horizontal frame; and a corner connection member inserted in the horizontal frame and the vertical frame and couples the horizontal frame and the vertical frame with each other. 
         [0010]    The external frame may include: a partition member provided in the horizontal frame and the vertical frame to form a corner insertion hole in which the corner connection member can be inserted, and partitioning the holding groove; and a fastening screw penetrating the partition member and the protection screen and coupled to the internal frame. 
         [0011]    The horizontal frame and the vertical frame may include through holes on outer walls thereof, so that the fastening screw can be fastened to the partition member via the through holes. 
         [0012]    The internal frame may include: a plurality of horizontal clamping blocks arranged to face each other; a plurality of vertical clamping blocks arranged to face each other in between the plurality of horizontal clamping blocks and coupling the plurality of horizontal clamping blocks; and a plurality of bars arranged to intersect with each other to respectively couple the plurality of horizontal clamping blocks and the plurality of vertical clamping blocks. 
         [0013]    One among the plural bars may include: a hollow core member; a bar member in which the core member is inserted and arranged; and an assembling screw which couples the core member and the bar member with the horizontal clamping block and the vertical clamping block. 
         [0014]    One of the core member and the bar member may include a rotation-preventing groove, and the other one may include a rotation-preventing projection corresponding to the rotation-preventing groove and preventing rotation of the bar member. 
         [0015]    The rotation-preventing groove and the rotation-preventing projection may be arranged at intervals of 90 degrees. 
         [0016]    The protection screen may include a mesh latticed structure formed by on the plurality of lattice members. 
         [0017]    The lattice member includes a stainless steel wire. 
         [0018]    The stainless steel wire may have a diameter of 0.4 mm˜0.9 mm, and the mesh latticed structure may provide a lattice hole having a diameter of 0.4 mm˜1.0 mm. 
         [0019]    The plurality of lattice members may include a guide wall which has a cross-section being gradually enlarged from a top thereof toward a bottom and offsets wind by guiding the wind applied to the top toward lateral sides. 
         [0020]    The external frame may be made of aluminum and has a beam structure having a rectangular cross-section of which one side is opened, the internal frame may be made of aluminum and has a beam structure having a closed rectangular cross-section, and the protection screen may be first held by an alignment pin while surrounding at least three sides of the internal frame and then arranged between the external frame and the internal frame. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]    Exemplary embodiments of the inventive concept will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which: 
           [0022]      FIG. 1  is a perspective view of a safety window for hurricane protection and crime prevention according to an embodiment of the inventive concept; 
           [0023]      FIG. 2  is an exploded perspective view of a protection screen of  FIG. 1 ; 
           [0024]      FIG. 3  is an exploded perspective view of an external frame and an internal frame of  FIG. 1 ; 
           [0025]      FIG. 4  is an exploded perspective view showing that the protection screen is wound on the internal frame of  FIG. 3 ; 
           [0026]      FIG. 5  is an assembled view of  FIG. 4 ; 
           [0027]      FIG. 6  is a cross-section view taken along line I-I of  FIG. 5 ; 
           [0028]      FIG. 7  is a cross-section view of bars of  FIG. 1 ; 
           [0029]      FIG. 8  is an exploded perspective view of the bars of  FIG. 1 ; 
           [0030]      FIG. 9  is a cross-section view showing that a core member is coupled to a bar member in  FIG. 8 ; 
           [0031]      FIG. 10  is an enlarged front view of a lattice member of the protection screen of  FIG. 1 ; 
           [0032]      FIG. 11  is a cross-section view of the lattice member of  FIG. 10 , taken along line II-II. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0033]    The attached drawings for illustrating embodiments of the inventive concept are referred to in order to gain a sufficient understanding of the inventive concept and the merits thereof. 
         [0034]    Hereinafter, the inventive concept will be described in detail by explaining embodiments of the inventive concept with reference to the attached drawings. Like reference numerals in the drawings denote like elements. 
         [0035]    As shown in  FIGS. 1 and 2 , a safety window for hurricane protection and crime prevention according to an embodiment of the inventive concept includes an external frame  110  which has a window shape to be installed in a window frame of a wall of a building; an internal frame  130  which is inserted in and coupled to the external frame  110 ; and a protection screen  160  arranged to surround the internal frame  130  and fastened between the external frame  110  and the internal frame  130  to protect a window. 
         [0036]    According to this embodiment, the safety window for hurricane protection and crime prevention can provide a simple assembling structure and a firm holding structure to the protection screen  160  as the protection screen  160  having a lattice structure for protecting a window is fitted to and held by the external frame  110  while surrounding the internal frame  130 . 
         [0037]    Also, the protection screen  160  is firmly held in between an outer wall of the internal frame  130  and an inner wall of the external frame  110 , so that the window can be protected by the protection screen  160  in the state that the external frame  110  is installed in the window frame. 
         [0038]    The protection screen  160  may include a stainless steel wire to be described later, which can relieve a shock of a strong wind such as hurricane by resisting the strong wind and reducing wind speed when the strong wind blows; protect the window from impact directly applied to the window by blocking an external object that may hit the window; and prevent an outsider from trespassing through the window. At the same time, the protection screen  160  can provide light and fresh air to an inside of a building while the window is being open. 
         [0039]    As shown in  FIGS. 2 and 6 , the assembling structure between the external frame  110  and the internal frame  130  firmly holding the protection screen  160  according to an exemplary embodiment can be shown in detail from the cross-section of the external frame  110  and the coupled state of the internal frame  130  to the external frame  110 . 
         [0040]    Below, the external frame  110 , the internal frame  130  and the coupling structure therebetween, and the structure of the protection screen  160  will be described in detail with reference to  FIGS. 2 to 6 . 
         [0041]    According to this exemplary embodiment, the external frame  110  includes a holding groove  113  in which the internal frame  130  is inserted and arranged, and a hooking projection  115  preventing the internal frame  130  from separating from the holding groove  113 . Further, the internal frame  130  includes a supporting projection  131  corresponding to the hooking projection  115  and hooked by and supported on the hooking projection  115 . 
         [0042]    With this structure, an assembling process for the external frame  110  and the internal frame  130  starts from first fixing the protection screen  160  with an alignment pin  132  while three adjacent sides of the internal frame  130  are surrounded with the protection screen  160 . At this time, the protection screen  160  surrounds the internal frame  130  so as to be adjacent to the supporting projection  131  of the internal frame  130 . 
         [0043]    Then, the internal frame  130  is fitted to the holding groove  113  of the external frame  110  so that the protection screen  160  can be arranged and held in between the external frame  110  and the internal frame  130 . At this time, the internal frame  130  is fitted to the holding groove  113  from a lateral direction of the external frame to a width direction of the external frame  110  so as to prevent the supporting projection  131  from moving over the hooking projection  115 . 
         [0044]    As an alternative to the foregoing assembling method, if the internal frame  130  is placed under the external frame  110  and pressed toward and fitted to the holding groove  113 , the supporting projection  131  may move over the hooking projection  115 . In this case, the external frame  110  is achieved by an elastic body so that lower end portions thereof having the hooking projection  115  can be open when pressed by the internal frame  130 . Thus, the external frame  110  can be restored from a transformed state to an original state when the internal frame  130  is fitted to the external frame  110 . 
         [0045]    To this end, according to this exemplary embodiment, the external frame  110  may be manufactured as an aluminum beam structure having a quadrangular cross-section, one side of which is opened, and the internal frame  130  may be manufactured as an aluminum beam structure having a closed quadrangular cross-section. 
         [0046]    As an alternative to the foregoing embodiment, the external frame  110  and the internal frame  130  may be made of a composite material of synthetic plastic and carbon fiber or made of carbon steel so as to have durableness and high elasticity 
         [0047]    According to this embodiment, the external frame  110  may be manufactured to have the beam structure in a quadrangle shape corresponding to the window, which can have the following structure in order to simply and firmly the rectangular shape. 
         [0048]    First, the external frame  110  according to an exemplary embodiment may include a horizontal frame  111 , a vertical frame  112  connected to the horizontal frame  111 , and a corner connection member  150  inserted in the horizontal frame  111  and the vertical frame  112  and coupling the horizontal frame  111  and the vertical frame  112  with each other. At this time, the corner connection member  150  has a rectangular structure so as to be arranged in a corner of a quadrangle formed by the horizontal frame  111  and the vertical frame  112  and couple the horizontal frame  111  and the vertical frame  112  with each other. 
         [0049]    According to this embodiment, the external frame  110  is formed to insert therein the corner connection member  150  having the rectangular shape. That is, the external frame  110  may include a partition member  118  provided in the horizontal frame  111  and the vertical frame  112  and partitioning the holding groove  113 , thereby forming a corner insertion hole  116  in which the corner connection member  150  can be inserted. 
         [0050]    The partition member  118  limits an upper portion of the holding groove  113  to the size for firmly fitting the corner connection member  150 , and provides screw holes  119  for fastening the internal frame  130  to the external frame  110 . 
         [0051]    As described above, the internal frame  130  is inserted and arranged in the holding groove  113  of the external frame  110  in the state that the protection screen  160  is wound on the internal frame  130 , and firmly fastened by a fastening screw  120  to be prevented from separating and shaking. At this time, the screw hole  119  is used for fastening the fastening screw  120 . The upper portion of the screw hole  119  is shaped to correspond to a head  121  of the fastening screw  120  so as to restrict and hold the head  121  of the fastening screw  120  fastened to the internal frame  130  via the partition member  118  and the protection screen  160 . 
         [0052]    Also, according to an embodiment, to easily insert the fastening screw  120  into the screw hole  119 , the outer walls of the horizontal frame  111  and the vertical frame  112  may have a through hole  122  through which the fastening screw  120  passes to be fastened to the partition member  118 . 
         [0053]    The through hole  122  may be formed by drilling the external frame  110  along a the same center line as the center line of the screw hole  119 . Then, the screw hole  119  can be formed by drilling the external frame  110  through the through hole  122  in the state that the through hole  122  is formed. The upper portion of the screw hole  119  shaped to correspond to the head  121  of the fastening screw  120  may be formed by changing a drill. 
         [0054]    At this time, the screw hole (not shown) of the internal frame  140  communicating with the screw hole  119  may be formed by tapping so that the fastening screw  120  can be fastened thereto. The screw hole (not shown) of the internal frame  130  may be previously formed before the internal frame  130  is inserted into the holding groove  113  of the external frame  110 . As an alternative to this exemplary embodiment, the screw hole (not shown) of the internal frame  140  and the screw hole  119  of the partition member  118  may be continuously formed by a drill inserted through the through hole  122  in the state that the internal frame  130  is inserted in the external frame  110 . 
         [0055]    According to an embodiment, the internal frame  130  is arranged in the holding groove  113  provided in an inner edge of the external frame  110 , and therefore have a shape corresponding to the external frame  110 . That is, the internal frame  130  may include a pair of horizontal clamping blocks  135  arranged to face each other, and a pair of vertical clamping blocks  136  arranged to face each other in between the pair of horizontal clamping blocks  135  and coupling the pair of horizontal clamping blocks  135 . 
         [0056]    Below, bars  140  installed in the internal frame  130  so as to support the protection screen  160  will be described with reference to  FIGS. 2 ,  3  and  7  to  9 . 
         [0057]    According to an exemplary embodiment, the internal frame  130  may further include the bars  140  supporting the protection screen  160  in order to make the protection screen  160  withstand higher external shocks. The plurality of bars  140  intersecting each other may be arranged in the external frame  130  so that the pair of horizontal clamping blocks  135  and the pair of vertical clamping blocks  136  can be coupled to each other. 
         [0058]    The plurality of bars  140  are arranged to have a simple crossed structure for supporting the back of the protection screen  160 . If impact higher than allowable strength is applied to the protection screen  160 , the bars  140  can protect the protection screen  160  from damage. In this embodiment, a direction from which the strong wind is blowing will be defined as the front of the protection screen  160 . 
         [0059]    Also, the crossed bars  140  widely support the back of the protection screen  160  and thus restrict deformation of the protection screen  160 , thereby relieving rupture due to accumulation of deformation and fatigue. Also, it is prevent an invader from cutting the protection screen  160  and trespassing into a residential space. 
         [0060]    To this end, the bars  140  assembled to the quadrangular internal frame  130  to give a firm holding structure according to an exemplary embodiment may include a plurality of members. That is, a horizontal bar  144  corresponding to one among the plural bars  140  may include a hollow core member  141 , a bar member  142  in which the core member  141  is inserted and arranged, and an assembling screw  145  coupling the core member  141  and the bar member  142  to the horizontal clamping blocks  135  and the vertical clamping blocks  136 . 
         [0061]    One of the core member  141  and the bar member  142  is provided with a rotation-preventing groove  146 , and the other one is provided with a rotation-preventing projection  148  corresponding to the rotation-preventing groove  146  and preventing the bar member  142  from rotation. According to this exemplary embodiment, the core member  141  is formed with the rotation-preventing groove  146 , and the bar member  142  is formed with the rotation-preventing projection  148  corresponding to this. At this time, the rotation-preventing groove  146  and the rotation-preventing projection  148  may be arranged at intervals of 90 degrees. 
         [0062]    Among the bars  140  according to the exemplary embodiment, a vertical bar  143  is arranged as being penetrated by the core member  141  that constitutes a horizontal bar  144 . At this time, the bar member  142  is put on and coupled to the core member  141 . The bar member  142  has a length corresponding to a space between the vertical bars  143  with regard to both the vertical clamping blocks  136 . In the state that the bar member  142  is put on the core member  141 , the core member  141  is coupled to the assembling screw  145  inserted in the vertical clamping blocks  136  and fastened to both the vertical clamping blocks  136 . 
         [0063]    The protection screen  160  arranged in front of the bars  140  may be made of a material that is durable and not easily deformed. That is, as described above, the protection screen  160  may be made of a stainless steel wire and have a mesh latticed structure. 
         [0064]    Such a mesh latticed structure of the protection screen  160  resists the strong wind blowing toward the window and changes the strong wind into a weak wind. The mesh latticed structure may have a smaller size than the scale of plotting paper in order to damp shock energy to the window. That is, the strong wind hits the window in the state that its kinetic energy is weakened as the wind speed is decreased by flow resistance of the latticed structure while passing through the latticed structure of the protection screen  160 . 
         [0065]    As described above, the protection screen  160  is manufactured to have the mesh latticed structure as the plurality of lattice members  161  are arranged in horizontal and vertical directions. At this time, the lattice member  161  may be made of the stainless steel wire among various materials, and the stainless steel wire may have a diameter of 0.4 mm˜0.9 mm. Further, the mesh latticed structure may provide a lattice hole having a diameter of 0.4 mm˜1.0 mm to relieve the strong wind. Such a dense latticed structure with the lattice hole having approximately the same diameter as the stainless steel wire can provide sufficiently effective flow resistance with respect to the strong wind. Also, the protection screen  160  may provide light and fresh air to the inside of the building through the lattice hole when the window is open. 
         [0066]    According to an exemplary embodiment, the lattice member  161  may be made of not only the stainless steel wire but also a high molecular compound capable of providing high stiffness like aramid fiber. 
         [0067]    Meanwhile, the lattice member  161  of the protection screen  160  according to an exemplary embodiment may further include a guide wall  165  that has a cross-section being gradually enlarged from a top thereof toward a bottom and offsets wind by guiding the wind applied to the top toward lateral sides. 
         [0068]    The guide wall  165  is rounded to make the cross-section of the lattice member  161  be gradually enlarged, so that the strong wind applied to the plurality of lattice members  161  can be partially guided in opposite directions and thus the strong winds guided in the directions opposite to each other can be offset. 
         [0069]      FIG. 10  shows an enlarged view of the lattice member  161  of the protection screen  160 , and  FIG. 11  shows a cross-section view of the plurality of stainless steel wire. In  FIGS. 10 and 11 , it is illustrated that the strong wind applied to the protection screen  160  is guided along the guide wall  165  and its kinetic energy is offset within one lattice. 
         [0070]    The arrows shown in  FIGS. 10 and 11  indicate the flow directions of the strong window. According to an exemplary embodiment, the strong wind flows toward the center of the lattice hole by the rounded structure corresponding to the guide wall  165  of the lattice member  161 . Therefore, the strong winds blowing in the opposite directions are offset while running against each other, and the strong wind going straightly also meets the flow resistance. 
         [0071]    Such a cross-section structure of the lattice member  161  may be achieved by drawing or pressing out the stainless steel wire to have the guide wall  165 . Alternatively, the stainless steel wire may be coated with another material to have the foregoing cross-section of the lattice member  161 . 
         [0072]    According to the present inventive concept, there is provided the safety window for hurricane protection and crime prevention, in which the protection screen with the lattice structure for protecting the window is fitted to and held by the external frame while surrounding the internal frame, so that the window can be protected from hurricane, an outsider can be prevented from trespassing through the window, and light and fresh air can be supplied to the inside of the building by opening the window. 
         [0073]    While the inventive concept has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood that various changes in form and details may be made therein without departing from the spirit and scope of the following claims.

Summary:
Disclosed is a safety window for hurricane protection and crime prevention. According to an embodiment of the inventive concept, the safety window for hurricane protection and crime prevention includes: an external frame which has a window shape and is installed in a window frame of a wall of a building; an internal frame which is coupled to the external frame; and a protection screen which comprises a plurality of holes to prevent an outsider from trespassing but allow air to pass therethrough, couples with the external and internal frames, and protects a window.