Abstract:
A spike nail for nailing in walls made of gypsum boards or fiber boards has a nail body which consists of a first blade and a second blade. The nail body includes a striking section, a upper guiding sleeve, a lower guiding sleeve, a screw thread guiding section and a nail point section. The spike nail thus constructed can be nailed into gypsum board or fiber board walls to facilitate hanging articles.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The invention relates to a spike nail structure and particularly to a spike nail for nailing in walls made of gypsum boards or fiber boards to hang articles.  
         [0003]     2. Description of the Prior Art  
         [0004]     A conventional spike nail  1  (referring to  FIG. 1 ) for nailing in walls made of gypsum boards or fiber boards such as the one disclosed in French patent No. 012420 includes a first blade  11  and a second blade  12  folding together. It has a striking section  13  to receive hitting of a tool to drive a nail point section  14  into a gypsum board or fiber board wall. Then a lag spike may be inserted to drive the first and the second blades apart to anchor the spike nail on the wall W. The lag spike can be used to hang articles. Such a structure still has drawbacks in use, notably: 
        1. The nail point section  14  of the spike nail  1  is formed by coupling a first nail point  111  of the first blade  11  and a second nail point  121  of the second blade  12 . The first nail point  111  is longer than the second nail point  121 . When the spike nail  1  is hit by a tool, the first nail point  111  pierces into wall W first. When the second nail point  121  pierces into the wall W, the cross sections of the first blade  11  and the second blade  12  increase the instantaneous resistance of piercing. The spike nail  1  tends to be deformed or split due to not sufficient strength. As a result, construction quality suffers. The wall W could even cracks.     2. The longitudinal distance between the nail point section  14  of the spike nail  1  and the striking section  13  is relatively long. In the event that either the first blade  11  or the second blade  12  is tilted slightly, the lag spike is skewed during fastening due to lack of guiding support.        
 
       SUMMARY OF THE INVENTION  
       [0007]     In view of the aforesaid disadvantages, the present invention aims to provide a spike nail structure that consists of a first blade and a second blade coupling together to form a nail body. The nail body includes a striking section, a upper guiding sleeve, a lower guiding sleeve, a screw thread guiding section and a nail point section. The spike nail thus constructed can be nailed in walls made of gypsum boards or fiber boards to facilitate hanging articles.  
         [0008]     In one aspect of the invention, the upper guiding sleeve and the lower guiding sleeve are maintained on a same center line.  
         [0009]     In another aspect of the invention, the second blade has a second point section slightly smaller than a first point section of the first blade so that the second point section is held closely in an indented recess formed on the first point section to shrink the piercing cross section.  
         [0010]     In yet another aspect of the invention, the first point section of the first blade has two sides formed respectively a saw-toothed edge.  
         [0011]     In still another aspect, the first point section and the second point section of the first and the second blades have respectively a longitudinal reinforced rib corresponding to each other.  
         [0012]     In another aspect of the invention, a transverse rib action zone that has at least one transverse and bent rib is formed on the first and the second blades between the nail point section and the lower guiding sleeve. The pitch between two transverse ribs corresponds to the pitch of the lag spike so that when the lag spike pierces into the spike nail the nail point section is driven and expanded at a greater amount.  
         [0013]     The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0014]      FIG. 1  is a sectional view of a conventional spike nail piercing through a wall.  
         [0015]      FIG. 2  is a schematic view of the spike nail of the invention in a unfolded condition.  
         [0016]      FIG. 3  is a perspective view of the spike nail of the invention in a unfolded condition.  
         [0017]      FIG. 4  is a perspective view of the spike nail of the invention in a folded condition.  
         [0018]      FIG. 5  is an exploded view of the invention.  
         [0019]      FIG. 6  is a schematic view of the invention nailed into a wall.  
         [0020]      FIG. 7  is a fragmentary sectional view of the nail point section of the invention.  
         [0021]      FIG. 8  is a cross section taken on line I-I in  FIG. 6 .  
         [0022]      FIG. 9  is a cross section taken on line II-II in  FIG. 6 .  
         [0023]      FIG. 10  is a schematic view of the invention nailed into a wall.  
         [0024]      FIG. 11  is another schematic view of the invention nailed into a wall. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0025]     Referring to  FIGS. 2 through 5 , the spike nail  2  according to the invention includes a nail body  20  which consists of a first blade  21  and a second blade  22  folded and coupled together about a folding line  201 . The nail body  20  includes:  
         [0026]     a striking section  2 A located on a upper side of the nail body  20  and formed by bending head sections  211  and  221  outwards that are located respectively on a upper portion of the first blade  21  and the second blade  22 . It has a lag spike guiding hole A in the center;  
         [0027]     a upper guiding sleeve  2 B formed by extending hole walls  212  and  222  of the lag spike guiding hole A downwards to direct insertion of a lag spike  3 ;  
         [0028]     a lower guiding sleeve  2 C formed by inverted conical walls  213  and  223  and located below the upper guiding sleeve  2 B;  
         [0029]     a screw thread guiding section  2 D located between the upper guiding sleeve  2 B and the lower guiding sleeve  2 C on a position of the first blade  21  and the second blade  22  corresponding to each other, and formed in a specification matching the traveling path and the pitch of screw threads  31  of the lag spike  3  having at least one thread guarding sleeve  214  and  224  to direct fastening and positioning of the lag spike  3 ; and  
         [0030]     a nail point section  2 E located on a lower portion of the nail body  20  consisting of a first point section  215  and a second point section  225  of the first blade  21  and the second blade  22  that are coupled together. The first point section  215  has a size and length slightly greater than that of the second point section  225 . The first point section  215  further has an indented recess  2151  to hold the second point section  225  closely.  
         [0031]     In addition, the first and second point sections  215  and  225  have respectively at least one longitudinal reinforced rib  216  and  226  corresponding to each other. The first point section  215  has two lateral sides formed respectively a saw-toothed edge  2152 .  
         [0032]     The first blade  21  and the second blade  22  further have a transverse rib action zone  2 F formed by at least one transverse and bent rib  217  and  227  between the nail point section  2 E and the lower guiding sleeve  2 C that correspond to each other. The interval of the transverse ribs  217  and  227  corresponds to the pitch of the lag spike  3  so that the nail point section  2 E may be guided and expanded at a greater amount when the lag spike  3  runs through.  
         [0033]     Moreover, the first blade  21  has at least one coupling flap  218  on the outer edge to latch on a notch  228  formed on a corresponding outer edge of the second blade  22  when folded so that the first blade  21  and the second blade  22  are coupled firmly without separating.  
         [0034]     The first blade  21  and the second blade  22  also have respectively at least one longitudinal reinforced rib  219  and  229  close to lateral sides to increase the strength of the nail body  20 .  
         [0035]     By means of the structure set forth above, when in use in construction (referring to  FIGS. 6 through 11 ), first, point the nail point section  2 E of the nail body  20  to a desired location on the gypsum board or fiber board wall  4 ; hit the striking section  2 A by a tool; as the second point section  225  of the second blade  22  is closely held in the indented recess  2151  of the first blade  21  so that the cross section of the first point section  215  becomes the entire coupled cross section of the first and the second point sections (referring to  FIGS. 7, 8  and  9 ), hence the piercing resistance can be reduced drastically. Moreover, the longitudinal reinforced ribs  216 ,  219 ,  226  and  229  of the point sections  215  and  225  can increase the strength of the nail body  20 , thus deformation of the nail body may be avoided when subject to striking and defective construction may be prevented. After the nail point section  2 E is sunk into the gypsum board or fiber board wall  4 , the lag spike  3  may be fastened into the lag spike guiding hole A, and directed by the upper guiding sleeve  2 B and the screw thread guiding section  2 D into the lower guiding sleeve  2 C. As the upper guiding sleeve  2 B and the lower guiding sleeve  2 C are located on the same center line, and the thread guarding sleeves  214  and  224  mate and are confined by the screw threads  31  of the lag spike  3 , skewing of the spike nail may be prevented. When the nail point  311  of the spike nail  3  is sunk into the lower guiding sleeve  2 C by screwing, the transverse rib action zone  2 F below the inverted conical walls  213  and  223  will be rammed by a greater piercing thrust to form a new thrust spot to increase outward expansion degree of the nail point section  2 E (referring to  FIGS. 10 and 11 ). Therefore, the nail point section  2 E can be fully extended to fasten the nail body  20  firmly in the wall  4 . And the lag spike  3  can firmly hang articles desired.