Patent Publication Number: US-2006000321-A1

Title: Hand tool structure

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      This invention relates to a hand tool structure, and more particularly to a structure that eliminates bubbles from producing in the handle during injection to increase the strength of the hand tool.  
      2. Description of the Prior Art  
      A conventional hand tool, as shown in  FIG. 4 , includes a handle A and a screw head rod B. The screw head rod B has one end formed into a screwdriver or a socket B 1 , while the other end is formed with a plurality of ribs B 2 . The ribs B 2  are seated in the cave C 1  of a mold C, so that when liquid plastic material is poured through an injecting gate C 2  of the mold C, the screw head rod B 2  is integral with the handle A.  
      This prior art has a number of shortcomings: 
      1. The connection between the handle A and the screw head rod B relies on the ribs B 2 . This connection is too weak. It is sometimes easy to be broken or loosened.     2. When pouring liquid plastic material into the mold, it sometimes produces bubbles within the handle A. This weakens the strength of the handle as well.    

     SUMMARY OF THE INVENTION  
      It is the primary objective of the present invention to provide a hand tool structure, which eliminates bubbles from producing in the handle during the molding procedure. Thus, it is more solid and stronger.  
      It is another objective of the present invention to provide a hand tool structure, which utilizes an end block to increase contacting area between the screw head rod and the plastic material to enhance the hand tool lifetime.  
      It is a further objective of the present invention to provide a hand tool structure, which is safe and easy to use.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is an exploded view of the present invention;  
       FIG. 2  is a view of a mold of the present invention, showing an injecting gate for liquid plastic material to be poured into the mold;  
       FIG. 3  is a cross-sectional view of the present invention; and  
       FIG. 4  is a view of a mold of a prior art.  
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
      As shown in  FIGS. 1 and 2 , the present invention comprises a handle  1  and a screw head rod  2 .  
      The handle  1  is formed by pouring liquid plastic material into a cave  31  of a mold  3 . The screw head rod  2  has a screw head  21  at one end and a plurality of ribs  22  at the other end. An end block  23  is formed at the endmost of the ribs  22 . The end block  23  may be a separated one secured to the screw head rod  2 .  
      To manufacture the present invention, as shown in  FIGS. 2 and 3 , place the end block  23  with the ribs  22  of the screw head rod  2  into the cave  31  of the mold  3  and pour liquid plastic material into the cave  31  through an injecting gate  32 . The liquid plastic material poured into the cave  31  of the mold  3  will flow through the end block  23 , which forms turbulence in the cave  31 . This slows down the pouring speed and eliminates bubbles from forming in the handle  1 . Due to the end block  23 , the contacting area between the screw head rod  2  and the plastic material are enlarged, which enhances the sustainability of striking force towards to the hand tool, and the ribs  22  around the screw head rod  2  also enhances the torque force of the hand tool as well. Thus, the strength of the handle  1  is improved more than double with respect to the handles of conventional screwdrivers.  
      Further, the screw head rod  2  may be formed with a threaded section to secure a nut at the endmost to slow down the pouring speed and cause turbulence within the cave  31  of the mold  3 .