Abstract:
A concrete bolt assembly comprises a bolt set and a spherical washer for the bolt set to penetrate. The bolt set includes a concrete bolt member and a spherical nut disposed on the concrete bolt member. The spherical nut has a first sphere and the spherical washer has a second sphere. With the arrangement of the first sphere and the second sphere, the concrete bolt assembly can be embedded in a building material from any inclined angle since the contact of the spherical nut and the spherical washer exerts a perpendicular force to densely tighten the concrete bolt assembly, prevent the embedded concrete bolt assembly from easily corning off or extracting front the building material after screwing, and enhance an engaging effect of the assembly.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a concrete bolt, particularly to a concrete bolt assembly comprising a spherical washer and a spherical nut. 
         [0003]    2. Description of the Related Art 
         [0004]    Referring to  FIGS. 1 and 2 , a conventional concrete bolt assembly  1  comprises a concrete bolt member  11 , a nut  12  disposed on the concrete bolt member  11 , and a washer  13  disposed under the nut  12 . Wherein, the concrete bolt member  11  includes a shank  111 , and a threaded section  112  disposed around the shank  111 . Herein, the nut  12  is a hexagonal formation and has a flat plane  121 . Further, the washer  13  defines an opening  131  for the concrete holt member  11  to penetrate. 
         [0005]    Accompanying with  FIG. 2 , the concrete bolt assembly  1  is utilized to fix an object  4  into a building material  2  (such as concrete). In screwing, a predrilled hole  21  is defined on a proper position of the concrete  2 . Accordingly, when the shank  111  of the concrete bolt member  11  penetrates the washer  13  and enters the predrilled hole  21 , a wrench (not shown) is exerted to screw the concrete holt assembly  1 . When the nut  12  touches the washer  13 , the concrete bolt member  11  starts to be firmly engaged in the predrilled hole  21 , so that the object  4  is fixed to the concrete  2 . 
         [0006]    However, there are shortcomings existing in the conventional concrete bolt assembly  1 : 
         [0007]    1. When the concrete bolt member  11 , the flat plane  121  of the nut  12 , and the washer  13  contact with each other in a planar way, there is no room for the concrete bolt member  11  to be freely adjusted. Namely, if the concrete bolt member  11  is screwed askew, an interstice P is adversely occurred among the concrete bolt member  11 , the nut  12 , and the washer  13 , or between the washer  13  and the object  4 . As a result, foreign substances or moisture may get into the interstice P, which easily corrodes the concrete bolt assembly  1  and reduces using life thereof. 
         [0008]    2.If the concrete bolt assembly  1  is improperly struck or screwed askew in order to be fastened more firmly, the predrilled hole  21  may be broken, and the structure as well as the strength of the concrete  2  may be destroyed. Consequently, the concrete bolt assembly  1  provides a poor fastening effect, which needs amendments. 
         [0009]    3. The planar structures of the nut  12  and the washer  13  are easily vibrated by accidental external influence. Subsequently, the concrete bolt member  11  and the nut  12  are influenced and they may easily retract out of the predrilled hole  21 . 
       SUMMARY OF THE INVENTION 
       [0010]    The object of the present invention is to provide a concrete bolt assembly that can be firmly fastened by an advanced engaging force. 
         [0011]    The concrete bolt assembly in accordance with the present invention comprises a bolt set and a spherical washer disposed on the bolt set. The bolt set includes a concrete bolt member and a spherical nut disposed on the concrete bolt member. Wherein, the concrete bolt member has a shank, and a first threaded section disposed, on the shank, opposite to the spherical nut. The spherical nut has a head portion formed with respect to a central axis, a first, top plane formed on the head portion, and a first bottom plane formed opposite to the first top plane. The first bottom plane is forced into a first, sphere configuration, and a center of the first sphere is situated on the central axis. In addition, the spherical washer has a washer body, a second top plane formed on the washer body, and a second bottom plane disposed opposite to the second top plane. Wherein, an opening is defined on the washer body for the shank of the concrete bolt member to penetrate. A second sphere, corresponding to the first sphere, is formed on the second top plane, and a center of the second sphere is situated on the central axis. 
         [0012]    Preferably, the concrete bolt member and the spherical nut are separated; on the shank of the concrete bole member, a neck is formed opposite to the first threaded section, a polygonal section is disposed above the neck, and a second threaded section is surrounded between the first threaded section and the neck; the spherical nut defines a threaded hole around the center of the first sphere for coupling to the second threaded section. 
         [0013]    Preferably, the polygonal section is a hexagonal section. 
         [0014]    Preferably, a pitch of the first threaded section is larger than a pitch of the second threaded section. 
         [0015]    Preferably, a plurality of slots are defined on the second bottom plane of the spherical washer, so that a periphery of the second bottom plane is indented by forming a plurality of teeth units thereon. 
         [0016]    Preferably, a radian of the first sphere of the spherical nut and a radian of the second sphere of the spherical washer are different. 
         [0017]    Accordingly, the spherical nut and the spherical washer are able to firmly contact with each other in any engaging angle during screwing the concrete bolt assembly. Namely, no interstice is incurred, and the concrete bolt assembly stably fastens an object by means of a perpendicular screwing force. Favorably, the engaging angle does not influence the fastened state and the structure strength of the object. Thereby, the concrete bolt assembly achieves a firm fastening effect. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         [0018]      FIG. 1  is a schematic view showing a conventional concrete bolt assembly; 
           [0019]      FIG. 2  is a schematic view showing the conventional, concrete bolt assembly in operation; 
           [0020]      FIG. 3  is a schematic view showing a first preferred embodiment of the present invention; 
           [0021]      FIG. 4  is a schematic view showing the first preferred embodiment of the present invent ion in operation; 
           [0022]      FIG. 5  is a schematic view showing a second preferred embodiment of the present invention; 
           [0023]      FIG. 6  is a schematic view showing the second preferred embodiment of the present invention in operation; 
           [0024]      FIG. 7  is another schematic view showing the second preferred embodiment of the present invention in operation; 
           [0025]      FIG. 8  is a schematic view showing the second preferred embodiment of the present invention in screwing; and 
           [0026]      FIG. 9  is a schematic view showing a third preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0027]    Before the present invention is described in greater detail, it should be noted that the like elements are denoted by the same reference numerals throughout the disclosure. 
         [0028]      FIGS. 3 and 4  show a first preferred embodiment of the present invention. A concrete bole assembly  3  is utilized to fasten an object  4  to a building material  2 , such as concrete. The concrete bolt assembly  3  comprises a bolt set  30  and a spherical washer  31  for the bolt set  30  to penetrate. Wherein, the bolt set  30  includes a concrete bolt member  32  and a spherical nut  33  disposed on the concrete holt member  32 . The concrete bolt member  32  has a shank  321 , and a first threaded section  322  disposed on the shank  321 , opposite to the spherical nut  33 . The spherical nut  33  has a hexagonal head portion  332  formed with respect to a central axis  331 , a first top plane  333  formed on the head portion  332 , and a first bottom, plane  334  formed opposite to the first top plane  333 . The first bottom plane  334  is formed into a first sphere  334 A, and a center of the first sphere  334   a  is situated on the central axis  331 . Further, the spherical washer  31  is disposed on the bolt set  30 , The spherical washer  31  has a washer body  311 , a second top plane  312  formed on the washer body  311 , and a second bottom plane  313  disposed opposite to the second top plane  312 . Wherein, an opening  314  is defined in accordance with the central axis  331  on the washer body  311  for the shank  321  of the concrete bolt member  32  to penetrate. Moreover, a second sphere  312   a , corresponding to the first sphere  334 A, is formed on the second top plane  312 , and a center of the second sphere  312 A is also situated on the central axis  331 . 
         [0029]    Accompanying with  FIG. 4 , in using, the object  4  is to be fixed to the building material  2  (such as concrete). Firstly, a predrilled hole  21  is formed at a proper position of the concrete  2 . Afterward, when the bolt set  30  penetrates the spherical washer  31 , a wrench is further exerted to screw the concrete bolt assembly  3 . After the spherical nut  33  touches the spherical washer  31 , the bolt set  30  starts to be firmly engaged in the predrilled hole  21 . Accordingly, the object  4  is fixed to the concrete  2 . 
         [0030]    Herein, since the spherical washer  31  and the spherical nut  33  respectively have the first sphere  334 A and the second sphere  312 A, the spherical washer  31  and the spherical nut  33  can firmly contact each other even the bolt set  30  is fastened in an inclined angle. Preferably, there is no interstice incurred between the spherical nut  33  and the spherical washer  31  or between the spherical washer  31  and the object  4 ; namely, the room among the spherical nut  33 , the spherical washer  31 , and the object  4  is completely closed as figured. As a result, foreign substances and moisture are prevented from getting into the bolt set  30  and the predrilled hole  21 , so that the concrete bolt assembly  3  will not be corroded. In fact, since the centers or the first sphere  334 A and the second sphere  312 A are situated on the same central axis  331 , a perpendicular engaging force is resulted along the central axis  331  for firmly constraining the concrete bolt member  32  while the spherical washer  31  and the spherical nut  33  contact each other in time of screwing, Whereby, the perpendicular engaging force allows a more stable fastening effect of the concrete bolt assembly  1  to be achieved. Favorably, even the concrete bolt member  32  enters the concrete  2  along the inclined angle, the stable and firmly engaging force avoids breaking the concrete  2 . Concurrently, the fastened concrete bolt assembly  3  will not be withdrawn by any accidental external vibration; obviously, the fastening effect of the present invention is largely enhanced. 
         [0031]    Referring to  FIG. 5 , a second preferred embodiment of the present invention is shown. The concrete bolt assembly  3  similarly comprises the bolt set  30  and the spherical washer  31  as that of the previous embodiment. Differently, the concrete bolt member  30  and the spherical nut  33  are separated in this embodiment. On the shank  321  of the concrete bole member  32 , a neck  323  is formed opposite to the first threaded section  322 , a polygonal section  324  is disposed above the neck  323 , and a second threaded section  325  is surrounded between the first threaded section  322  and the neck  323 . Further, the spherical nut  33  defines a threaded hole  334 B around the center of the first, sphere  334 A for coupling to the second threaded section  325 . In this embodiment, the polygonal section  324  is directed to a hexagonal section that is commonly seen in practice. Moreover, a pitch d 1  of the first threaded section  322  is larger than a pitch d 2  of the second threaded section  325 . Accompanying with  FIGS. 6 to 8 , a wrench (not shown) is utilized to rotate the polygonal (hexagonal) section  324  on the shank  321  so as to bring the first threaded section  322  getting into the predrilled hole  21 . When the bolt set  30  is engaged properly, the polygonal (hexagonal) section  324  is snapped from the neck  323  (as shown in  FIG. 7 ). In the meantime, the fastening of the concrete bolt assembly  3  is not completed yet. In order to complete the fastening of the concrete bolt assembly  3 , the wrench further rotates the spherical nut  33 , so that the spherical nut.  33  is able to move toward the spherical washer  31  until they are both stopped by the object  4 . Accordingly, the concrete bolt member  32  is now firmly engaged in the predrilled hole  21 , and the object  4  is tightly and stably locked onto the concrete  2 . 
         [0032]    Referring to  FIG. 9 , a third preferred embodiment of the present invention is shown. The concrete bolt assembly  3  similarly comprises the concrete bolt member  32  and the spherical washer  31  as that of the previous embodiment. Differently, a plurality of slots  313 A are defined on the second bottom plane  313  of the spherical washer  31 , so that a periphery of the second bottom plane  313  is indented by forming a plurality of teeth units  313 B thereon. Concurrently, a radian of the first, sphere  334 A of the spherical nut  33  and a radian of the second sphere  312 A of the spherical washer  31  are different. Accordingly, the teeth, units  313 B of the spherical washer  31  increase resistance between the spherical washer  31  and the object  4 , so that the concrete bolt assembly  3  is able to be more tightly engaged after screwed. Moreover, the different radians of the spherical washer  31  and the spherical nut  33  also augment friction therebetween, so that the spherical washer  31  and the spherical nut  33  can be more tightly clenched after screwed. Thereby, the concrete bolt assembly  3  does not easily come off the concrete  2 . 
         [0033]    To sum up, the present invention takes advantage of the first sphere of the spherical nut and the second sphere of the spherical washer to increase a contacting area therebetween. Namely, the spherical washer and the spherical nut can be tightly engaged in a perpendicular way even the concrete bolt assembly is fastened into the concrete by means of any inclined screwing angle. Accordingly, there is no interstice occurred after the spherical washer and the spherical nut assist the concrete bolt member in fastening. Therefore, the concrete bolt assembly can tightly and stably stay in the concrete, and the structure or the strength of the concrete will not be destroyed, Preferably, the embedded concrete bolt assembly will not be removed easily since it is prevented from external influence. 
         [0034]    While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.