Abstract:
The present invention provides a position mechanism including a locating body. The locating body defines a locating cavity and a receiving chamber communicating with the locating cavity. A locating stopper is received in the receiving chamber of the locating body with an end thereof toward the locating cavity, and an elastic component is received in the receiving chamber of the locating body and resiliently biases the locating stopper into the locating cavity.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a position mechanism, and more particularly to a position mechanism used in an injection mold for positioning a semi-finished product to be shaped into a finished product in the injection mold. 
         [0003]    2. The Related Art 
         [0004]    The injection molding technology is widely used in the mold field for shaping a plastic product. Generally, different parts of the plastic product are made from different kinds of material, so that the plastic product needs to be positioned and shaped for several times. Supposing that the plastic product is made from two different kinds of material, the plastic product needs to be shaped for two times. Correspondingly, a mold where the plastic product is shaped includes a first injection molding apparatus and a second injection molding apparatus for shaping the plastic product. A part of the plastic product is shaped in the first injection molding apparatus of the mold using one kind of the material, and then the plastic product is positioned in the second injection molding apparatus of the mold for shaping another part thereof using the other kind of the material. 
         [0005]    However, conventionally, after the plastic product is shaped for the first time in the first injection molding apparatus, the plastic product is semi-finished and then the semi-finished plastic product is positioned in the second injection molding apparatus to be shaped into a finished plastic product through a conventional position mechanism which is adopted to locate the semi-finished plastic product via position pins, locating blocks or other simple components. Because the plastic product is easily driven rotating or moving by external force in the process of being shaped, the conventional position mechanism cannot guarantee the position precision, that is, the shaping quality of the plastic product has no security. If the plastic product is driven rotating or moving in the process of being shaped into the finished plastic product, the finished plastic product maybe has defects and is unserviceable and has to be discarded, which wastes material. 
       SUMMARY OF THE INVENTION 
       [0006]    Accordingly, an object of the present invention is to provide a position mechanism used in an injection mold for positioning a semi-finished product to be shaped into a finished product in the injection mold. The position mechanism includes a locating body defining a locating cavity and a receiving chamber communicating with the locating cavity. A locating stopper is received in the receiving chamber of the locating body with an end thereof toward the locating cavity. And an elastic component is received in the receiving chamber of the locating body and resiliently biases the locating stopper into the locating cavity. 
         [0007]    As described above, after a product is shaped in the injection mold for one time, the product is semi-finished and named the semi-finished product. Then the semi-finished product is placed in the locating cavity of the locating body. The semi-finished product compresses the locating stopper to make the locating stopper move sideward. At the same time, the elastic force of the elastic component pushes the locating stopper to move toward the locating cavity. Then, the semi-finished product is firmly located in the locating cavity, which avoids the semi-finished product rotating or moving in the process of being shaped into the finished product. Therefore, the position precision of the position mechanism is raised, which ensures the shaping quality of the finished product. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    The present invention will be apparent to those skilled in the art by reading the following description of a preferred embodiment thereof, with reference to the attached drawings, in which: 
           [0009]      FIG. 1  is an exploded view of a position mechanism according to the present invention; 
           [0010]      FIG. 2  is a cross-sectional view of a locating body of the position mechanism taken along line of II-II of  FIG. 1 ; 
           [0011]      FIG. 3  is a perspective view of the position mechanism; and 
           [0012]      FIG. 4  is a cross-sectional view of the position mechanism taken along line of IV-IV of  FIG. 3 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0013]    Referring to  FIG. 1 , a position mechanism  1  used in an injection mold is illustrated that includes a locating body  10 , a pair of locating stoppers  20  received in the locating body  10 , a pair of coil springs  30  received in the locating body  10  and blocked by the locating stoppers  20  and a pair of screws  40  mounted in the locating body  10  and jamming the coil springs  30 . 
         [0014]    With reference to  FIG. 1  and  FIG. 2 , the locating body  10 , the locating stoppers  20 , the coil springs  30  and the screws  40  are described in detail. The locating body  10  is substantially rectangular and has a top wall  11  and two sidewalls  12 . A locating cavity  13  is defined at the center of the top wall  11  and extends into the inner of the locating body  10 . Each of the two sidewalls  12  defines a receiving chamber  14  stretching into the inner of the locating body  10 . The receiving chamber  14  has a limiting cavity  141  communicating with the locating cavity  13  and a retaining cavity  142  communicating with the limiting cavity  141  and outside. The diameter of the retaining cavity  142  is greater than the diameter of the limiting cavity  141  in order to define a shoulder  143  therebetween. An inner surface of the retaining cavity  142  machines screw threads adjacent to the outside. 
         [0015]    The locating stopper  20  has a column-shaped locating portion  21 . An end of the locating portion  21  protrudes therearound to form a resisting portion  22 . The locating portion  21  and the resisting portion  22  have the same axle center. The diameter of the resisting portion  22  is greater than the diameter of the locating portion  21 . The screw  40  is column-shaped. The screw  40  defines screw threads around an outer surface thereof. The screw  40  has a closed end  42  and the other end opposite the closed end  42  defines an opening  41  for facilitating the screw  40  being assembled in the locating body  10 . 
         [0016]    Please refer to  FIG. 1 ,  FIG. 3  and  FIG. 4 . In assembly, the locating stoppers  20  are respectively disposed in the receiving chambers  14  of the locating body  10 . The locating portion  21  is received in the limiting cavity  141  and partly protrudes into the locating cavity  13 . The resisting portion  22  is received in the retaining cavity  142  and resists against the shoulder  143 . The coil springs  30  are respectively disposed in the retaining cavities  142  of the locating body  10 . One end of the coil spring  30  is elastically compressed against the resisting portion  22  of the locating stopper  20 . The screws  40  are respectively mounted in the retaining cavities  142  of the locating body  10 . The screw threads defined on the screw  40  engage with the screw threads defined on the inner surface of the retaining cavity  142  to fix the screw  40  in the retaining cavity  142  firmly. The closed end  42  of the screw  40  presses an opposite end of the coil spring  30 . 
         [0017]    In use, a plastic product is shaped in the injection mold for two times (not shown). After the plastic product is shaped in the injection mold for one time, the plastic product is semi-finished and named a semi-finished plastic product. Then the semi-finished plastic product is placed in the locating cavity  13  of the locating body  10 . The semi-finished plastic product compresses the locating portions  21  of the locating stoppers  20  to make the locating portions  21  move sideward. Then the semi-finished plastic product is located between the locating portions  21 . At the same time, the elastic force of the compressed coil springs  30  pushes the locating stoppers  20  to move toward the locating cavity  13 . Therefore, the semi-finished plastic product is firmly located between the locating portions  21  in the locating cavity  13 , which avoids the semi-finished plastic product rotating or moving in the process of shaping the semi-finished plastic product into a finished plastic product. 
         [0018]    As described above, the position mechanism  1  is able to firmly position the semi-finished plastic product through defining the locating cavity  13  and the receiving chambers  14  on the locating body  10  thereof. Then the locating stoppers  20 , the coil springs  30  and the screws  40  are disposed in the receiving chambers  14  respectively for firmly positioning the semi-finished plastic product in the locating cavity  13 , avoiding the semi-finished plastic product rotating or moving in the process of being shaped into the finished plastic product. Therefore, the position precision of the position mechanism  1  is raised, which ensures the shaping quality of the finished plastic product. 
         [0019]    The foregoing description of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. Such modifications and variations that may be apparent to those skilled in the art are intended to be included within the scope of this invention as defined by the accompanying claims.