Abstract:
A wrench assembly consists of a handle and a wrench. The handle includes a head. The wrench includes a first gear non-rotationally put in the head of the handle, a second gear rotationally installed in the first gear for engagement with a tool bit and a one-way driving device arranged between the first gear and the second gear so that the first gear can drive the second gear in a direction through the one-way driving device.

Description:
CROSS-REFERENCE  
       [0001]     The present application is a continuation-in-part application of U.S. patent application Ser. No. 10/369,167 of which the disclosure is incorporated herein. 
     
    
     BACKGROUND OF INVENTION  
       [0002]     1. Field of Invention  
         [0003]     The present invention relates to a wrench assembly consisting of a handle and a wrench disclosed in U.S. patent application Ser. No. 10/369,167.  
         [0004]     2. Related Prior Art  
         [0005]     According to U.S. patent application Ser. No. 10/369,167, a wrench  1  includes a first gear  16 , a second gear  20  and a one-way driving device  30 . The first gear  10  is provided for contact with a user&#39;s hand. The second gear  20  is put in the first gear  10  for engagement with a tool bit  70 . The one-way driving device  30  is used between the first gear  10  and the second gear  20  so that the first gear  10  can drive the second gear  20  in a direction through the one-way driving device  30 . A tab  40  is pivotally connected with the first gear  10  between a lying position and a standing position. In the standing position, the tab  40  is operable to rotate the first gear  10 . The connection of the tab  40  with the first gear  10  however may not stand a large force. Alternatively, a handle  71  is connected with the first gear  10 . The handle  71  is operable to rotate the first gear  10 . However, the connection of the handle  71  with the first gear  10  is not convenient enough.  
         [0006]     The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.  
       SUMMARY OF INVENTION  
       [0007]     A wrench assembly consists of a handle and a wrench. The handle includes a head. The wrench includes a first gear non-rotationally put in the head of the handle, a second gear rotationally installed in the first gear for engagement with a tool bit and a one-way driving device arranged between the first gear and the second gear so that the first gear can drive the second gear in a direction through the one-way driving device.  
         [0008]     The advantage of the wrench assembly according to the present invention is that the connection of the head of the handle with the first gear of the wrench can stand a large force.  
         [0009]     Another advantage of the wrench assembly according to the present invention is that the connection of the head of the handle with the first gear of the wrench is convenient.  
         [0010]     Other advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the attached drawings. 
     
    
     BRIEF DESCRIPTION OF DRAWINGS  
       [0011]     The present invention will be described through detailed illustration of embodiments referring to the attached drawings wherein:  
         [0012]      FIG. 1  is an exploded view of a wrench assembly according to a first embodiment of the present invention.  
         [0013]      FIG. 2  is a perspective view of a wrench of the wrench assembly shown in  FIG. 1 .  
         [0014]      FIG. 3  is an exploded view of the wrench shown in  FIG. 2 .  
         [0015]      FIG. 4  is a cross-sectional partial view of the wrench assembly shown in  FIG. 1 .  
         [0016]      FIG. 5  is a cross-sectional partial view of the wrench assembly shown in  FIG. 1  including a wrench of a first size.  
         [0017]      FIG. 6  is a cross-sectional partial view of the wrench assembly shown in  FIG. 1  including a wrench of a second size.  
         [0018]      FIG. 7  is an exploded view of a wrench assembly according to a second embodiment of the present invention.  
         [0019]      FIG. 8  is an exploded view of a wrench assembly according to a fourth embodiment of the present invention.  
         [0020]      FIG. 9  is an exploded view of a wrench of the wrench assembly shown in  FIG. 8 .  
         [0021]      FIG. 10  is an exploded view of a handle.  
         [0022]      FIG. 11  is a cross-sectional partial view of the wrench assembly shown in  FIG. 8 .  
         [0023]      FIG. 12  is similar to  FIG. 11  but shows the wrench assembly in a different position.  
         [0024]      FIG. 13  is an exploded view of the wrench assembly shown in  FIG. 8  including a wrench of a first size.  
         [0025]      FIG. 14  is an exploded view of the wrench assembly shown in  FIG. 8  including a wrench of a second size.  
         [0026]      FIG. 15  is an exploded view of a wrench assembly according to a fourth embodiment of the present invention.  
         [0027]      FIG. 16  is a partially cross-sectional view of a wrench assembly according to a fifth embodiment of the present invention.  
         [0028]      FIG. 17  is a cross-sectional partial view of the wrench assembly shown in  FIG. 16 .  
         [0029]      FIG. 18  is an exploded view of the wrench assembly shown in  FIG. 16  including a wrench of a first size.  
         [0030]      FIG. 19  is an exploded view of the wrench assembly shown in  FIG. 16  including a wrench of a second size. 
     
    
     DETAILED DESCRIPTION OF EMBODIMENTS  
       [0031]     Referring to  FIGS. 1 and 2 , a wrench  1  is similar to the wrench described in U.S. patent application Ser. No. 10/369,167. Therefore, the wrench  1  will not be in detail. It however should be noted that the first annular ring  10  includes two apertures  16  defined therein.  
         [0032]     Referring to  FIG. 3 , a handle  60  includes a head  61  defining a space  62 , a ring  63  extending on the wall of the space  62  and defining an opening  64  communicated with the space  62 , and two stems  65  projecting from the ring  63 .  
         [0033]     Referring to  FIG. 4 , according to a first embodiment of the present invention, a wrench assembly includes the wrench  1  and the handle  60 . The wrench  1  is put in the head  61  of the handle  60 . The stems  65  are inserted in the apertures  16  defined in the first gear  10  of the wrench  1 . Thus, the handle  60  is operable to rotate the wrench  1 .  
         [0034]     Referring to  FIG. 5 , the wrench assembly includes a wrench of a first size. Referring to  FIG. 6 , the wrench assembly includes a wrench of a second size. The radial thickness of the first gear  10  shown in  FIG. 5  is smaller than that of the first gear  10  shown in  FIG. 6 . Hence, the size of the second gear  20  shown in  FIG. 5  is greater than that of the second gear  20  shown in  FIG. 6 . That is, the wrench assembly shown in  FIG. 5  is operable to drive a larger bolt or nut (not shown) than the wrench assembly shown in  FIG. 6 .  
         [0035]      FIG. 7  shows a wrench assembly according to a second embodiment of the present invention. The second embodiment is similar to the first embodiment except for including ribs  68  extending on the wall of the space  62  of the head  61  instead of the stems  65  projecting from the ring  63  and for including grooves  18  instead of the apertures  16 . As the wrench  1  is put in the head  61  of the handle  60 , the ribs  68  are put in the grooves  18 . Thus, the handle  60  is operable to rotate the wrench  1 .  
         [0036]      FIG. 8  shows a wrench assembly according to a third embodiment of the present invention. The wrench assembly includes a wrench  1  and handle  60 . The wrench  1  includes a first gear  10  and a gear  25 . The first gear  10  of the third embodiment is like the first gear  10  of the first embodiment except for including a recess  17  instead of the apertures  16 .  
         [0037]     Referring to  FIG. 9 , from the gear  25  extends an insert  26  for insertion in a socket (not shown) that can in turn be engaged with a bolt or nut (not shown). The gear  25  includes a detent  27  for contact with the socket and a switch  28  for control over the detent  27 . The gear  25  is conventional and therefore will not be described in detail.  
         [0038]     Referring to  FIG. 10 , the handle  60  of the third embodiment is similar to the handle  60  of the first embodiment except for including a space  66  defined therein and a passage  67  through which the space  66  is communicated with the space  62 .  
         [0039]     Not like the first embodiment, the third embodiment includes a locking device  70  for locking the wrench  1  to the handle  60 . The locking device  70  includes a detent  73  inserted in the passage  67 , a spring  74  put in the detent  73 , a ball  72  put against the spring  74  and a switch  71  inserted in the space  66 . The switch  71  includes a shallow annular groove  75  and a deep annular groove  76 .  
         [0040]     Referring to  FIG. 11 , the ball  72  is put in the shallow annular groove  75  so that the detent  73  is trapped in the recess  17 . The wrench  1  is hence kept in the head  61  of the handle  10 .  
         [0041]     Referring to  FIG. 12 , the ball  72  is put in the deep annular groove  75  so that the detent  73  can be removed from the recess  17 . The wrench  1  can be removed from the head  61  of the handle  10 .  
         [0042]     Referring to  FIG. 13 , the wrench  1  shown in  FIG. 8  includes a wrench and, more particularly, an insert  26  of a first size.  
         [0043]     Referring to  FIG. 14 , the wrench assembly shown in  FIG. 8  includes a wrench and, more particularly, an insert  26  of a second size.  
         [0044]      FIG. 15  shows a wrench assembly according to a fourth embodiment of the present invention. The fourth embodiment is similar to the first embodiment except that the first gear  10  includes the apertures  16  instead of a recess  17 .  
         [0045]      FIGS. 16 and 17  show a wrench assembly according to a fifth embodiment of the present invention. The fifth embodiment is similar to the third embodiment except that the wrench  1  includes the second gear  20  instead of the gear  25 .  
         [0046]     Referring to  FIG. 18 , the wrench assembly shown in  FIG. 16  includes a wrench of a first size.  
         [0047]     Referring to  FIG. 19 , the wrench assembly shown in  FIG. 16  includes a wrench of a second size.  
         [0048]     The present invention has been described through detailed illustration of the embodiments. Those skilled in the art can derive variations from the embodiments without departing from the scope of the present invention. Hence, the embodiments shall not limit the scope of the present invention defined in the claims.