Patent Publication Number: US-2005135892-A1

Title: End milling cutter assembly

Description:
FIELD OF THE INVENTION  
      The present invention relates to an end milling cutter assembly wherein the cutter bar is secured in two different directions and the whole length is shortened so as to avoid from shaking and bending.  
     BACKGROUND OF THE INVENTION  
      A conventional end milling cutter assembly is shown in  FIG. 1  and generally includes a handle  10  that has an sleeve  15  extending from a lower end thereof and two threaded holes  150  are defined radially through the sleeve  15 . A recess  151  is defined in a distal end of the sleeve  15  so as to receive a cutter bar  20  therein. The cutter bar  20  is secured in positioned by two bolts  16  which are engaged with the threaded holes  150  and contact a surface defined in an outer periphery of the cutter bar  20  in the recess  151 . The end milling cutter is fixed to the cutter bar  20  so as to mill an object. Referring to  FIG. 2 , because the length of the cutter bar  20  is too long, when milling the object, the cutter bar  20  shakes as shown and severely affects the result of milling. Besides, as shown in  FIG. 3 , when the end milling cutter is used to mill along an inclined surface of an object, the cutter bar  20  could be bent because the inclined surface applies a force to the cutter bar  20  only at one direction.  
      The present invention intends to provide an end milling cutter assembly which has a shorter length and the cutter bar is secured in two different directions.  
     SUMMARY OF THE INVENTION  
      The present invention relates to an end milling cutter assembly which comprises a handle with a passage defined longitudinally therethrough and a receiving recess is defined in an end of the handle so as to receive an insertion of a cutter bar. A threaded hole is defined radially through the handle and in communication with the passage. The cutter bar has a surface defined in an outer periphery of the insertion and a first bolt is engaged with the threaded hole so as to contact the surface of the cutter bar. A second bolt is securely engaged with the passage in the handle and threadedly engaged with the threaded recess in the insertion of the cutter bar.  
      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  
       FIG. 1  is a cross sectional view to show a conventional end milling cutter assembly;  
       FIG. 2  shows that the cutter bar of the conventional end milling cutter assembly shakes during milling;  
       FIG. 3  shows that the cutter bar of the conventional end milling cutter assembly bends during milling;  
       FIG. 4  is an exploded view to show the end milling cutter assembly of the present invention;  
       FIG. 5  shows the insertion of the cutter bar is secured in two different directions;  
       FIG. 6  shows the enlarged head of the handle and the flange of the cutter bar of the present invention are matched with each other, and  FIG. 7  shows a comparison between the conventional end milling cutter assembly and the end milling cutter assembly of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
      Referring to  FIGS. 4 and 5 , the end milling cutter assembly of the present invention comprises a handle  50  which has an enlarged head  51  at a first end thereof and an enlarged threaded recess  550  defined in a second end of the handle  50 . A passage  55  is defined longitudinally in the handle  50  and shares a common axis of the enlarged threaded recess  550 . A receiving recess  52  is defined in an end of the enlarged head  51  and a threaded hole  53  is defined radially through the enlarged head  51  of the handle  50 . The threaded hole  53  and the receiving recess  52  are respectively in communication with the passage  55  in two different directions.  
      A cutter bar  60  has an insertion  62  on an end thereof and a threaded recess  64  is defined in the insertion  62 . A surface  63  is defined in an outer periphery of the insertion  62 . The insertion  62  is inserted in the receiving recess  52  and a first bolt  54  is engaged with the threaded hole  53  and contacts the surface  63  of the cutter bar  60  so as to secure the cutter bar  60  in horizontal direction. A second bolt  56  is securely engaged with the passage  55  in the handle  50  and threadedly engaged with the threaded recess  64  in the insertion  62  of the cutter bar  60 . The cutter bar  60  is then securely positioned in the vertical direction. A third bolt  57  is threadedly engaged with the enlarged threaded recess  550  and includes a connection bar  570  so as to be connected to a milling machine which is not shown.  
      As shown in  FIG. 6 , the enlarged head  51  has a first flat end surface  510  and the cutter bar  60  includes a flange  61  wherein the insertion  62  is located at a center of the flange  61 . The flange  61  has a second flat end surface  610  which is matched with the first flat end surface  510  when the handle  50  and the cutter bar  60  is connected to each other. By the engagement of the two flat end surfaces  510 ,  610 , the cutter bar  60  is secured and does not shifted relative to the handle  50  during milling.  
      As shown in  FIG. 7 , because the assembly of the present invention needs no sleeve  15  as disclosed in  FIG. 1 , the length of the assembly of the present invention is shorter than the conventional end cutter milling assembly and this is helpful to reduce shaking during operation.  
      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.