Patent Publication Number: US-2007101651-A1

Title: Blade of shutter door

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      This invention relates to the blades of a shutter door, particularly to ones transversely arranged in series and pivotally fixed on the doorframe of a shutter door, able to lower material cost and strengthen the structure of the blades.  
      2. Description of the Prior Art  
      A conventional shutter door includes a rectangular doorframe having its inner hollowed space pivotally fixed with lots of blades transversely arranged in series from the upper side to the lower side. Each blade has one broadside connected with an ad justing rod by two U-shaped nails hooked with each other. Thus, the blades of the shutter door can be controlled to be turned open for an angle. The blades of the shutter door are mostly solid bodies made of wood.  
      However, each solid wooden blade of the conventional shutter door is quite heavy and needs to be made mostly of wood, so each shutter door needs lots of such blades to be disposed thereon, with the cost of material being comparatively high.  
     SUMMARY OF THE INVENTION  
      The objective of the invention is to offer the blade of a shutter door, which includes a blade body and at least one solid member. The blade body is a long and flat hollow shell formed integral of plastic. The hollow shell is fixed therein with at least one reinforcing rib between its first and second- end and formed with a plurality of hollow spaces defined by the reinforcing ribs. The solid member is stuffed in at least one hollow space at a preset location of the blade body for supporting the blade to be turned pivotally or for fixing a U-shaped nail that is connected with an adjusting rod. By so designing, it is possible to strengthen the structure of the blade to prevent it from becoming curved and deformed, and lower material cost. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS  
      This invention will be better understood by referring to the accompanying drawings, wherein:  
       FIG. 1  is a perspective view of a first preferred embodiment of a blade of a shutter door in the present invention;  
       FIG. 2  is an exploded perspective view of the first preferred embodiment of a blade of a shutter door in the present invention;  
       FIG. 3  is a perspective view of the first preferred embodiment of the blades assembled on a doorframe in the present invention;  
       FIG. 4  is a partial perspective view of the first preferred embodiment of the blade having its opposite ends respectively fixed with a pivot in the present invention;  
       FIG. 5  is a partial perspective view of the first preferred embodiment of the blade connected with an adjusting rod by two U-shaped nails hooked with each other in the present invention;  
       FIG. 6  is a perspective view of a second preferred embodiment of a blade of a shutter door in the present invention;  
       FIG. 7  is a perspective view of a third preferred embodiment of the blade of a shutter door in the present invention;  
       FIG. 8  is a perspective view of a fourth preferred embodiment of the blade of a shutter door in the present invention; and  
       FIG. 9  is a perspective view of a fifth preferred embodiment of the blade of a shutter door in the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
      A first preferred embodiment of the blade of a shutter door in the present invention, as shown in  FIGS. 1 and 2 , includes a rectangular doorframe  10 , a plurality of blades  20  and an adjusting rod  30  combined together.  
      The doorframe  10  has its interior formed with a hollowed space  11  for the blades  20  to be pivotally fixed laterally therein from the upper side to the lower side.  
      Each blade  20  has its broadside  21  connected with the adjusting rod  30  by means of two U-shaped nails  22  hooked with each other, as shown in  FIG. 5 , letting the blades  20  controlled by the adjusting rod  30  to be turned pivotally. In addition, each blade  20  consists of a blade body  23  and three solid members  24 .  
      The blade body  23  is shaped as a long and flat hollow shell  23   1  having a first end  232  and a second end  233  opposite to each other. Two reinforcing ribs  234  are lengthwise fixed upright in the intermediate portion of the blade body  23  between the first and the second and  232 ,  233  of the hollow shell body  231 , and other two reinforcing ribs  235  are respectively and lengthwise positioned at a location near the opposite sides of the blade body  23 , letting the interior of the hollow shell body  231  formed with five proper-sized hollow spaces  236  separated by the reinforcing ribs  234  and  235 .  
      The solid members  24  are made of wood, ABS (acrylonitrile butadiene styrene) or other materials and have their cross sections respectively shaped as the hollow space  236  of the intermediate portion of the hollow shell  231  and the hollow space  236  near the opposite sides of the hollow shell body  231  of the blade body  23  so that the solid member  24  can be respectively and stuffed exactly in the hollow spaces  236 . In this preferred embodiment, the length of the solid member  24  is somewhat equivalent to the distance between the opposite ends of the hollow space  236 , so the solid member  24  can be fully stuffed in the hollow space  236 . In addition, the solid member  24  stuffed in the intermediate hollow space  236  has its opposite ends respectively secured with a pivot  25  to be pivotally connected with the door frame  10 , as shown in  FIG. 4 , while the solid member  24  stuffed in the hollow space  236  at the opposite sides of the hollow shell body  231  is for fixing the U-shaped nail  22  thereon after the U-shaped nail  22  is inserted through the hollow shell  231  of the blade  23 , as shown in  FIG. 5 .  
      A second preferred embodiment of the blade of a shutter door in the present invention, as shown in  FIG. 6 , has a structure almost the same as that described in the first preferred embodiment, except that only the hollow space  236  separated by the two reinforcing ribs  234  at the intermediate portion of the blade body  23  is stuffed therein with a solid member  24 .  
      A third preferred embodiment of the blade of a shutter door in the present invention, as shown in  FIG. 7 , has a structure almost the same as that described in the first preferred embodiment, except that only the two hollow spaces  236  separated by both the two reinforcing ribs  235  near the opposite sides of the blade body  23  and the hollow shell body  23   1  are respectively stuffed therein with a solid member  24 .  
      A fourth preferred embodiment of the blade of a shutter door in the present invention, as shown in  FIG. 8 , has a structure almost the same as that described in the second preferred embodiment, except that the hollow space  236  separated by both the reinforcing rib  235  near one side of the blade body  23  and the hollow shell body  231  is stuffed therein with a length of solid member  24  at an intermediate portion for fixing the U-shaped nail  22  after the U-shaped nail  22  is inserted through the hollow shell  231  of the blade body  23 .  
      A fifth preferred embodiment of the blade of a shutter door in the present invention, as shown in  FIG. 9 , has a structure a almost the same as that described in the second preferred embodiment, except that a comparatively long U-shaped nail  22  is inserted through the hollow shell  231  of the blade body  23  and then orderly inserted through one side reinforcing rib  235  and one intermediate reinforcing rib  234  and finally fixed with the solid member  24  stuffed in the intermediate hollow space  236 .  
      As can be understood from the above description, this invention has the following advantages.  
      1. The blade body  23  is formed integral of plastic with comparatively low specific gravity and shaped as a long and flat hollow body, so the total weight of the blade body  23  is comparatively light, able to lessen the load of the pivot  25  at the opposite ends of the blade  20  and prolong their service life.  
      2. The blade body  23  is a flat hollow body so it is economical in material cost, conforming to economic gain.  
      3. The reinforcing ribs  234 ,  235  properly positioned in the interior of the hollow blade body  23 , functioning to strengthen the structure of the blade  20  to prevent the blade  20  from becoming curved and deformed.  
      4. In accordance with practical needs, the solid member  24  can be optionally stuffed in any one of the five hollow spaces  236  of the blade body  23  for supporting the blade  20  to turn pivotally and fixing the U-shaped nail  22  that connects the blade  20  together with the adjusting rod  30 , strengthening the structure of the blade  20 .  
      While the preferred embodiments of the invention have been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.