Patent Publication Number: US-2013230363-A1

Title: Screw with multi-hexahedron head

Description:
BACKGROUND 
     1. Technical Field 
     The disclosure relates to screws and, more particularly, to a screw with multi-hexahedron head. 
     2. Description of Related Art 
     A head of a hex cap screw often includes six angles, and the screw cannot satisfy the size of some grooves. 
     Therefore, what is needed is a screw to satisfy more needs. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a screw with multi-hexahedron head in accordance with a first exemplary embodiment. 
         FIG. 2  is a perspective view of a screw with multi-hexahedron head in accordance with a second exemplary embodiment. 
         FIG. 3  is an isometric view of a bottom surface of a head of the screw of  FIG. 1 . 
         FIG. 4  is a perspective view of the screw of  FIG. 1 , engaged with a T-shaped groove. 
         FIG. 5  is a cross-sectional view of the screw of  FIG. 4 , engaged with the T-shaped groove 
     
    
    
     DETAILED DESCRIPTION 
       FIGS. 1-2  show a screw with multi-hexahedron head (hereinafter “the screw”). The screw  1  includes a body  10  and a head  20 . The head  20  is positioned on the top of the body  10  that defines an external thread around the circumference. 
     The head  20  is composed of at least two hexahedrons. In the embodiment, the head  20  is composed of two hexahedrons which are a first hexahedron  21  and a second hexahedron  22 . The two hexahedrons  21 ,  22  are parallel with each other and similar. The first hexahedron  21  defines two opposite sidewalls  210  and a first parallelogram bottom surface  211 . The second hexahedron  22  defines two opposite sidewalls  220  and a second parallelogram bottom surface  221 . 
       FIGS. 3-5  show the screw  1  engaged with a T-shaped groove  2 . There are two heights to each of the parallelogram bottom surfaces  211 ,  221 , a first height “a” from one side and a second height “b” from an adjacent side in  FIG. 3 , for example. The first height “a” is greater than the second height “b”. In the embodiment, the length of the height “a” is less than the length of the height “b”, that means that the second height “b” is greater than the first height “a”. 
     The second height is equal to or greater than a diameter of the body  10  and equal to or less than a width of an opening of a T-shaped groove  2 . In the embodiment, the second height of the first parallelogram bottom surface  211  is equal to the second height of the second parallelogram bottom surface  221 . In another embodiment, the second height of the first parallelogram bottom surface  211  is not equal to the second height of the second parallelogram bottom surface  221 . Therefore, when the screw  1  is engaged with the T-shaped groove  2  via the head  20 , the head  20  is directly inserted into the T-shaped groove  2  via the opening of the T-shaped groove  2 . 
     The first height of the first parallelogram bottom surface  211  is equal to the width of the opening of the T-shaped groove  2 . When the head  20  is inserted into the T-shaped groove  2  via the opening of the T-shaped groove  2 , the screw  1  is rotated 90 degrees and two opposite sidewalls  210  of the first hexahedron  21  are respectively engaged with two opposite sidewalls  310  of the opening. 
     The first height of the second parallelogram bottom surface  221  is greater than the width of the opening of the groove  2 . When the head  20  is inserted into the T-shaped groove  2  via the opening of the T-shaped groove  2 , the screw  1  is rotated 90 degrees and the bottom surface  221  of the second hexahedron  22  are attached on two inner surfaces  320  of the T-shaped groove  2 . 
     Therefore, if the ends of the T-shaped groove  2  are closed, the head  20  can be directly inserted into the T-shaped groove  2  via the opening of the T-shaped groove  2 . Therefore, when the screw  1  is engaged with the T-shaped groove  2 , it is stable. 
     Although the present disclosure has been specifically described on the basis of the exemplary embodiment thereof, the disclosure is not to be construed as being limited thereto. Various changes or modifications may be made to the embodiment without departing from the scope and spirit of the disclosure.