Abstract:
A palm wrench includes a C-shaped body and a driving head. The driving head is pivotably and rotatably located within the body. The body has an opening, and the driving head has two function ends on two sides thereof. The driving head is pivotably connected to the body by two pivots which extend through the body and are connected to the driving head. The driving head can be rotated with respect to the body, and the user can grapes the body to rotate the driving head to output torque.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Fields of the Invention 
         [0002]    The present invention relates to a wrench, and more particularly, to a palm wrench with a rotatable driving head rotatably and pivotably located in a C-shaped casing. 
         [0003]    2. Descriptions of Related Art 
         [0004]    The conventional palm wrench is disclosed in U.S. Pat. No. 6,976,408 which has an annular case with a ratchet unit which has a function end. The case has plate pivotably connected to the outside of the case so that the user can grape the case to operate the case. The case has a cover threadedly mounted to the top thereof to restrict the ratchet unit. However, the function end of the ratchet unit and the case can only be fixed on the same axis so that the function end cannot be adjusted angularly relative to the case. 
         [0005]    The present invention intends to provide a palm wrench which eliminates the shortcomings mentioned above. 
       SUMMARY OF THE INVENTION 
       [0006]    The present invention relates to a palm wrench including a C-shaped body and a driving head pivotably and rotatably located within the body. The body has an opening at one end, and the driving head has two function ends on two sides. The driving head is pivotably connected to the body by two pivots which extend through the body and are connected to the driving head. The user grapes the body to rotate the driving head to output torque. 
         [0007]    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 
         [0008]      FIG. 1  is an exploded view of the palm wrench of the present invention; 
           [0009]      FIG. 2  is a top view of the body of the palm wrench of the present invention; 
           [0010]      FIG. 3  is a perspective view to show the palm wrench of the present invention; 
           [0011]      FIG. 4  is a top view of the palm wrench of the present invention; 
           [0012]      FIG. 5  is a cross sectional view, taken along line A-A in  FIG. 4 ; 
           [0013]      FIG. 6  is an enlarged view of the circled B in  FIG. 5 ; 
           [0014]      FIG. 7  is a cross sectional view, taken along line C-C in  FIG. 4 ; 
           [0015]      FIG. 8  shows that the driving head is rotated relative to the body of the palm wrench of the present invention; 
           [0016]      FIG. 9  is an exploded view of the driving head of the palm wrench of the present invention; 
           [0017]      FIG. 10  is an exploded view of the second embodiment of the palm wrench of the present invention; 
           [0018]      FIG. 11  is a top view of the palm wrench of the present invention in  FIG. 10 ; 
           [0019]      FIG. 12  is a cross sectional view, taken along line A-A in  FIG. 11 ; 
           [0020]      FIG. 13  is an enlarged view of the circled B in  FIG. 12 ; 
           [0021]      FIG. 14  is an exploded view of the third embodiment of the palm wrench of the present invention, and 
           [0022]      FIG. 15  a top view of the palm wrench of the present invention in  FIG. 14 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0023]    Referring to  FIGS. 1 to 8 , the palm wrench the of the present invention comprises a C-shaped body  10 , a driving head  30 , two pivots  40 , two first resilient members  50 , a first bead  60  and a second resilient member  61 . The body  10  includes an inner periphery  13  and an outer periphery  14 , and has an opening  15 . A dent  17  is defined in the inner periphery  13  of the body  10 . Two apertures  11  are respectively and diametrically defined in the inner periphery  13  of the body  10 . Each aperture  11  communicates with a sink hole  12  defined in the outer periphery  14  of the body  10 . A line between the center of the opening  15  and the center of the dent  17  is perpendicular to the line between two respective centers of the two apertures  11 . Multiple notches  16  are defined in the outer periphery  14  of the body  10  so that the user can easily grape the body  10 . The gap  21  is defined as the distance between the two outer ends of the two apertures  11 . The outer diameter  23  of the body  10  is between 45 mm to 75 mm. The distance of the gap  21  is larger than the inner diameter  22  of the inner periphery  13  of the body  10 , but is less than the outer diameter  23  of the outer periphery  14  of the body  10 . The ratio between the width  24  of the opening  15  and the inner diameter  22  of the inner periphery  13  of the body  10  is 0.5:1 to 0.9:1, preferably, 0.6:1 to 0.8:1. The best ratio is 0.7:1. 
         [0024]    The driving head  30  has two pivotal holes  31  defined diametrically therein. The diameter of the pivotal holes  31  is the same as that of the apertures  11 . The outer diameter of the driving head  30  is smaller than the inner diameter  22  of the inner periphery  13  of the case  10 . Each pivotal hole  31  co-axially communicates with a passage  32  which has inner threads  33  defined therein. The driving head  30  has a first function end  34  and a second function end  341  on two ends thereof. The first function end  34  and the second function end  341  each are rectangular protrusions of different sizes so as to be connected with a socket, an adapter or an extension rod. The driving head  30  has at least one first hole  35  defined in the outer periphery thereof and the at least one first hole  35  is located corresponding to the dent  17 . 
         [0025]    The two pivots  40  each have a head  44 , a stem  41  extending from the head  44  and a shank  42  extending from the stem  41 . The stem  41  has outer threads  43  defined in the outer periphery thereof. Each pivot  40  extends through the aperture  11  with the stem  41  loosely extending through the aperture  11 . The shank  42  extends through the pivotal hole  31  and the passage  32 . The outer threads  43  are threadedly connected to the inner threads  33 . The head  44  is accommodated in the sink hole  12 . The driving head  30  is rotatable about the two pivots  40  relative to the body  10 . 
         [0026]    The two first resilient members  50  such as springs, are respectively located in the two apertures  11  of the body  10  and the pivotal hole  31  of the driving head  30 . The two first resilient members  50  are respectively mounted to the two shanks  42  of the two pivots  40  so as to be biased between the inner end of the pivotal hole  31  and the stem  41 . The two first resilient members  50  and the two pivots  40  are located symmetrically to the center of the driving head  30 . 
         [0027]    The first bead  60  and the second resilient member  61  are located in the at least one first hole  35 . The first bead  60  is biased by the second resilient member  61  so as to be engaged with the dent  17  to position the driving head  30  relative to the body  10 . 
         [0028]    As shown in  FIG. 8 , the driving head  30  is rotated about the two pivots  40  so as to be positioned to make the axis of the driving head  30  and the axis of the body  10  be perpendicular to each other, and the second function end  341  is located corresponding to the opening  15 . 
         [0029]    As shown in  FIG. 9 , the driving head  30  comprises a casing  301 , a rotational member  302 , a pawl  303 , a third resilient member  304 , a disk  305 , a clip  306 , a second bead  307  and a fourth resilient member  308 . The casing  301  is a ring like member and has ratchet teeth  3010  defined in the inner periphery thereof. The pivotal holes  31 , the passages  32 , and the at least one first holes  35  are located on the outer periphery of the casing  301 . The rotational member  302  is rotatably located in the casing  301 , wherein the first and second function ends  34 ,  341  are respectively formed on the rotational member  302 . The first function end  34  has a groove  340  and the second function end  341  has a second hole  3410 . A semi-circular recess  3020  is defined in the rotational member  302 . The pawl  303  is located in the recess  3020  and within the casing  301 . The pawl  303  has engaging teeth  3030  defined in one side thereof so as to be engaged with the ratchet teeth  3010 . The pawl  303  has an insertion hole  3031  defined in the top thereof. The third resilient member  304  is a heart-shaped member which has a tip end  3040  and an insertion end which is formed by two ends of the third resilient member  304 . The third resilient member  304  is mounted to the first function end  34  and the insertion end is inserted into the insertion hole  3031  of the pawl  303 . The disk  305  is connected to the casing  301  and has a central hole  3050  through which the first function end  34  extends. The disk  305  has multiple ribs  3051  on the top thereof, and the tip end  3040  of the third resilient member  304  engaged with one of the ribs  3051 . The clip  306  is engaged with the groove  340 . The second bead  307  and the fourth resilient member  308  are located in the second hole  3410 . The second bead  307  is biased by the fourth resilient member  308  which is a spring. The disk  305  is rotatable about the rotational member  302  so as to drive the third resilient member  304  to move the pawl  303  within the recess  3020 , therefore, the driving head  30  is controlled to be rotated in clockwise or counter clockwise. 
         [0030]    As shown in  FIG. 10 , the driving head  30  has two first holes  35 , when the driving head  30  is rotated relative to the apertures  11 . Each first hole  35  receives a first bead  60  and a second resilient member  61  therein. One of the first holes  35  is located corresponding to the opening  15  and the other one of the first holes  35  is located corresponding to the dent  17 . The pivots  40  do not have the stem  41 . 
         [0031]      FIGS. 11 to 13  show that the second function end  341  is a hexagonal recess. The pivots  40  do not have the stem  41 . 
         [0032]    As shown in  FIG. 14 , there is no dent  17 , the first hole  35 , the first bead  60  and the second resilient member  61 . The driving head  30  cannot be position when the driving head  30  is rotatable relative to the body  10 . 
         [0033]    As shown in  FIG. 15 , the first function end  34  is a polygonal recess. The driving head  30  has a handle  36  which is located in the opening  15 . 
         [0034]    The driving head  30  can be operated at any angle relative to the body  10 . When the driving head  30  is rotated at an  90  degree position relative to the body  10 , the second function end  341  faces the opening  15 , the outer periphery  14  and the outer periphery of the driving head  30  are normal to each other so that the user can easily operate the wrench. The pivots  40  each have a stem  41  and a shank  42 , the stem  41  is located in the aperture  11 , and the shank  42  is located in the passage  32 , so that the pivots  40  are well positioned. The driving head  30  can be positioned by engaging the first bead  60  with the dent  17 . In one embodiment, there are two first holes  35  and each first hole  35  has a first bead  60  and a second resilient member  61 , so that the driving head  30  can be positioned relative to the body  10  in two directions. The first and second function ends  34 ,  341  allow different tools to be connected with the palm wrench of the present invention. Furthermore, the opening  15  can accommodate the handle  36  of the driving head  30  or an H-shaped driving head. 
         [0035]    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.