Abstract:
A positioning member is used to position the movable jaw to the sliding groove of the adjustable wrench and the adjustable wrench together with the positioning member are applied by vibrate grinding technology so as to make the outer surface of the movable jaw to be a mirror surface and the rod of the movable jaw is kept as the surface condition after being machine. The tolerance between the rod and the sliding groove is controlled within expected range.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    (1) Field of the Invention 
         [0002]    The present invention relates to a surface grinding process or obtaining a polished surface of an adjustable wrench and a positioning member for securing the movable jaw of the adjustable wrench during the surface grinding process. 
         [0003]    (2) Description of the Prior Art 
         [0004]    An adjustable wrench includes a fixed jaw which is integrally connected with the handle of the adjustable wrench, and a movable jaw which is slidably connected to the head of the wrench so that a distance between the fixed  1 and movable jaws can be adjusted. The surface of the adjustable wrench is ground to obtain a smooth surface which is then electro-plated with a surface layer to be a mirror surface. The conventional surface grinding process uses a wire to tie the head and the movable jaw together and then the head and the movable jaw are put in a lining barrel in which abrasive chips and compounds are received. The lining barrel is connected with a vibrate motor such that the head and the movable jaw are ground by contact with the abrasive chips and compounds. 
         [0005]    As shown in  FIG. 9 , the surface grinding process grinds the handle  90 , the head  91 , the fixed jaw  92  and the movable jaw  93 . Furthermore, the rod  931  of the movable jaw  93  and a neck  932  connecting the rod  931  and the movable jaw  93 , and the surface  933  connecting the surface  932  of the neck  932  and the movable jaw  93 , the sliding groove  911  and the surfaces of the walls defining the sliding groove  911  are also be ground. This grinding process removes the surface material of the areas that are ground so that the tolerance becomes larger than expected. The movable jaw  93  shakes in the sliding groove  911  during use and cannot well clamp object as desired. 
         [0006]    The present invention intends to provide a surface grinding process and a positioning member which is used to position the movable jaw and cover some areas that are not to be ground so that only pre-set areas of the adjustable wrench are ground. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention relates to an adjustable wrench which includes a handle and a head is fixed to an end of the handle. The fixed jaw integrally extends from a side of the head and a sliding groove is defined in the other side of the head. Two sidewalls extend from the head and define a recess therebetween which communicates with the sliding groove. A through hole is defined through the head and communicates with the sliding groove. The movable jaw is slidably engaged with the sliding groove and includes a jaw and a rod with a neck connected between the jaw and the rod. The positioning member is engaged with the sliding groove to directly or indirectly position the movable jaw with the sliding groove. The adjustable wrench and the positioning member are applied by vibration grinding technology. The rod, the sliding groove, the neck and the two respective top surfaces of the sidewalls are kept as the surface condition without being ground such that the tolerance between the movable jaw in the sliding groove can be controlled. 
         [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 adjustable wrench and the positioning of the present invention; 
           [0010]      FIG. 2  is a cross sectional view to show that the positioning member is hammered into the recess and the through hole in the head of the adjustable wrench; 
           [0011]      FIG. 3  is an end cross sectional view to show the positioning member is connected to the head of the adjustable wrench; 
           [0012]      FIG. 4  is a perspective view to show that the positioning member is positioned and the movable jaw is positioned by the positioning member; 
           [0013]      FIG. 5  is a perspective view to show a second embodiment of the positioning member of the present invention; 
           [0014]      FIG. 6  is a perspective view to show a third embodiment of the positioning member of the present invention; 
           [0015]      FIG. 7  is a perspective view to show a fourth embodiment of the positioning member of the present invention; 
           [0016]      FIG. 8  shows that the adjustable wrench together with the positioning member are put in a barrel to be ground, and 
           [0017]      FIG. 9  shows the movable jaw is tied to the head of the adjustable wrench when using a conventional surface grinding process. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0018]    Referring to  FIGS. 1-4  and  8 , the adjustable wrench  1  includes a handle  2  with a head  3  on one end of the handle  2 , and a fixed jaw  4  is integrally connected to a top of one side of the head  3  and has a clamping surface  41 . A sliding groove  31  is defined in a side of the head  3  and located between two sidewalls  33 . A through hole  34  is defined through the head  3  and communicates with the sliding groove  31 . A movable jaw  5  includes a rod  52  and a jaw  51 , a neck  54  is connected between the jaw  51  and the rod  52  which includes teeth  53  defined in an outer periphery thereof. The rod  52  is slidably inserted into the sliding groove  31  and the teeth  53  are engaged with a driving member (not shown) in the through hole  34 . When rotating the driving member, the movable jaw  5  is moved toward or away from the fixed jaw  4 . 
         [0019]    The movable jaw  5  is slidably connected to the head  3  by sliding the rod  52  into the sliding groove  31 , and a positioning member  10  is engaged with the sliding groove  31  to position the movable jaw  5 . The combination of the adjustable wrench and the positioning member  10  are put into the barrel “A” as shown in  FIG. 8  to be ground. The neck  54 , the rod  52 , the surface  55  that connects between underside of the jaw  51  and the neck  54 , the two respective top surfaces of the sidewalls  33  and the sliding groove  31  are covered by the positioning member  10  and not grounded so that these un-ground surfaces are kept as the surface condition after being machined. The positioning member  10  is made by plastic, metal, rubber, polymer or stuffing material. 
         [0020]    The positioning member  10  includes an elongate connection portion  11  which is wider than a width of the recess  32  and a covering portion  12  is located on the connection portion  11 . An insertion  13  extends from an underside of the connection portion  11 . The rod  52  of the movable jaw  5  is slid into the sliding groove  31  and contacts the clamping surface  41  of the fixed jaw  4 . The insertion  13  of the positioning member  10  is inserted into the through hole  34  via the recess  32  by using a hammer and the connection portion  11  of the positioning member  10  is engaged with the recess  32 . to and the sliding groove  31  to position the movable jaw  5  which is located between the fixed jaw  4  and the positioning member  10 . 
         [0021]    The front surface of the insertion  13  is in contact with the rear end of the rod  52 . The covering portion  12  rests on and covers the two top surfaces of the sidewalls  33 . The gap between the surface  55  and the two respective top surfaces of the sidewalls  33  are so small (usually between 0.05 mm to 0.25 mm) so that the abrasive chips cannot enter the gap so that the movable jaw  5  and the sliding groove  31  can be matched at a desired tolerance so that the movable jaw  5  does not shake during use. 
         [0022]      FIG. 5  shows a second embodiment of the positioning member  20  which includes a connection portion  21  which is slightly larger than the sliding groove  31  and an enlarged covering portion  23  is connected to the connection portion  21 . An hammering surface  22  is connected to an end of the connection portion  21  so that the user may hammer at the hammering surface  22 . An annular groove is defined between the hammering surface  22  and the connection portion  21  so that the user can holds the hammering surface  22  to pull the positioning member  20  out after grinding. An L-shaped covering portion  23  is located above the connection portion  21 . The connection portion  21  of the positioning member  20  is engaged with the sliding groove  31  to position the movable jaw  5  which is located between the fixed jaw  4  and the positioning member  20 . The two respective top surfaces of the sidewalls  33  are covered by the covering portion  23 . The distal end of the connection portion  21  contacts the rod  52  of the movable jaw  5  which does not shake during being ground. 
         [0023]      FIG. 6  shows a third embodiment of the positioning member  60  which includes a connection portion  61  which is wider than a width of the sliding groove  31  and a covering portion  62  is located on the connection portion  11 . The covering portion  62  is larger than or equal to a width of the two sidewalls  33 . Two walls  63  extend from the covering portion  62  so as to define a space  64  therebetween. The connection portion  61  is engaged with the sliding groove  31  and the covering portion  62  covers the two respective top surfaces of the sidewalls  33 . The movable jaw  5  is inserted in the space  64  so that the movable jaw  5  is indirectly in contact with the fixed jaw  4 . The rod  52 , the neck  54 , the surface  55  are covered and not ground. The outer surface of the jaw  51  of the movable jaw  5  and the outer surface of the fixed jaw  4  and the clamping surface  41  are ground. 
         [0024]      FIG. 7  shows a fourth embodiment of the positioning member which includes a first part  70  and a second part  80 . The first part  70  includes a connection part which is larger than the recess  32  and an enlarged covering portion  71  which is connected on the connection portion and is wider than or equal a width of two respective top surfaces of the sidewalls  33 . The second part  80  is slightly larger than the through hole  34  and can be engaged with the through hole  34 . The first part  70  is inserted into the recess  32  and positioned by the second part  80  which is engaged with the through hole  34  such that the movable jaw  5  is positioned at a distance from the fixed jaw  4 . The enlarged covering portion  71  covers the two respective top surfaces of the sidewalls  33 . The rod  52 , the neck  54 , the surface  55  are covered and not ground. The outer surface of the jaw  51  of the movable jaw  5  and the outer surface of the fixed jaw  4  and the clamping surface  41  are ground. 
         [0025]    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.