Abstract:
A tool box includes a base and a cover which is pivotably connected with the base. The base and the cover each have recesses defined therein for receiving tools. A carry unit is connected to the tool box via a securing unit connected between the carry unit and the tool box. The tool box can be carried on user&#39;s back.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a carry unit for tool box and the carry unit can be easily connected with or disengaged from the tool box. 
       BACKGROUND OF THE INVENTION 
       [0002]    A conventional tool box generally includes a base and a cover which has one side pivotably connected with the base. The base and/or the cover each have recesses defined in an inside thereof so as to receive tools therein. The cover may have a locking unit such that the cover can be securely connected with the base when carrying the tool box. Usually, a handle is connected to the base or the cover of the tool box and the user can carry the tool box by grabbing the handle. 
         [0003]    However, the tool box requires the user to carry it with one hand and this limits convenience of the user and only one hand can be used when carrying the conventional tool box. 
         [0004]    Some manufacturers develop a pull handle extending from the tool box such that the user can pull the tool box by pulling the pull handle. Nevertheless, the existence of the pull handle increases the cost of fabrication and the pull handle cannot be separated from the tool box and occupies extra space. Furthermore, if the ground surface is not even, it is difficult to pull the tool box by using the pull handle. 
         [0005]    The present invention intends to provide a carry unit for a tool box and the carry unit includes at least one strap or belt such that the user can carry the tool box on his or her back and two hands of the user can do something else when necessary. 
       SUMMARY OF THE INVENTION 
       [0006]    The present invention relates to a tool box which includes a base and a cover which is pivotably connected with the base. The base and the cover each have recesses defined therein for receiving tools. A carry unit is connected to the tool box via a securing unit connected between the carry unit and the tool box. The tool box is carried on user&#39;s back. 
         [0007]    The primary object of the present invention is to provide a carry unit connected to the tool box by a securing unit, the carry unit allows the user to carry the tool box on his or her back and the two hands of the users do not need to carry the tool box. 
         [0008]    The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is an exploded view to show the carry unit of a tool box of the present invention; 
           [0010]      FIG. 2  is a back plane view to show the carry unit of the present invention; 
           [0011]      FIG. 2A  is a cross sectional view to show the connection of the male and female parts of the carry unit of the present invention; 
           [0012]      FIG. 3  is a side plane view to show the carry unit of the present invention; 
           [0013]      FIG. 3A  is a cross sectional view to show connection strap connected between two sets of the male and female parts of the carry unit of the present invention; 
           [0014]      FIG. 4  is an exploded view to show a second embodiment of the carry unit of the present invention, and  FIG. 5  is an exploded view to show a third embodiment of the carry unit of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0015]    Referring to  FIGS. 1 ,  2 ,  2 A,  3  and  3 A, the tool box  1  for cooperation with the carry unit  2  of the present invention includes a base  10  and a cover  15  which is pivotably connected with the base  10 . The base  10  and the cover  15  each have recesses (not shown) defined therein so as to receive tools (not shown) in the recesses. The base  10  includes two recessed areas  11  defined in outside thereof and the cover  15  includes two locking members  16  which are able to be locked in the recessed areas  11 . 
         [0016]    The carry unit  2  of the present invention is connected to the tool box  1  via a securing unit  3  connected between the carry unit  2  and the tool box  1 . The securing unit  3  includes multiple connection combinations  3 ′ and each connection combination  3 ′ includes a male part  30  and a female part  35  which is removably connected with the male part  30 . The male parts  30  are connected to outside of the tool box  1  and the female parts  35  are connected to the carry unit  2 . Of course, the female parts  35  can be connected to outside of the tool box  1  and the male parts  30  are connected to the carry unit  2 . 
         [0017]    The carry unit  2  includes a first set and a second set, wherein the first set includes two shoulder straps  20  and a connection strap  25  is transversely connected between the two shoulder straps  20 . The connection strap  25  includes multiple extension portions  250  extending perpendicularly therefrom and female parts  35  are connected to the connection strap  25  and the extension portions  250 . The second set includes two adjustment straps  21  and a connection strap  25  is transversely connected between the two adjustment straps  21 . The connection strap  25  includes multiple extension portions  250  extending perpendicularly therefrom and female parts  35  are connected to the connection strap  25  and the extension portions  250 . The two transverse straps  25  and the extension portions  250  are connected to the tool box  1  by connecting the female parts  35  to the male parts  30 . The two adjustment straps  21  are connected with two buckles  22  to which the two shoulder straps  20  are connected. The length of the combination of the shoulder straps  20  and the adjustment straps  21  can be adjusted by using the buckles  22 . 
         [0018]      FIG. 4  shows a second embodiment of the carry unit  2  of the present invention, wherein the base  10  of the tool box  1  includes two elongate slots  113  defined in the back thereof and two recesses  115  are defined in two insides of two ends of each of the slots  113 . Two pins  33  are respectively engaged with the two recesses  115  at two ends of each of the slots  113 . Two ends of the carry unit  2  go around the two pins  33  and are connected to each other. One of the two ends of the carry unit  2  is connected with a buckle  24  and the other end of the shoulder strap  23  is connected to the buckle  24 . The number of the shoulder strap  23  can be one or two. 
         [0019]      FIG. 5  shows a third embodiment of the carry unit  2  and the securing unit  3  of the present invention, wherein the securing unit  3  includes two second connection combinations  3 ″ and each second connection combination  3 ″ includes a second male part  32  and a second female part  36 . The second female part  36  includes inner threads  361  and the second male part  32  includes outer threads  321  which are engaged with the inner threads  361 . Each of the second female parts  36  is received in a recess  114  defined in the outside of the too box  1  and the second male parts  32  are connected to the carry unit  2 . The second female parts  36  are connected to the tool box  1  by bolts. Of course, the second male parts  32  can be received in the recesses  114  defined in the outside of the too box  1  and the second female parts  36  are connected to the carry unit  2 . One end of the shoulder strap  27  is connected with a buckle  26  and the other end of the shoulder strap  27  is connected with the buckle  26 . The number of the shoulder strap  27  can be one or two. 
         [0020]    It is noted that the carry unit  2  can also be fixed to the tool box  1  simply by using screws (not shown) or any known methods. The carry unit  2  can be quickly connected to the tool box  1  or separated from the tool box  1 . The two hands of the user are free when carrying the tool box  1  by the carry unit  2  of the present invention. 
         [0021]    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.