Patent Publication Number: US-2009238914-A1

Title: Feed mechanism of mold

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to a mold, and more particularly to a feed mechanism of mold. 
     2. The Related Art 
     Traditionally, some components have more than two isolated portions apart from each other. Accordingly, a feed mechanism of mold defines more than two molding cavities to shape the isolated portions. However, because the feed mechanism of mold has only a runner to inject plastics, the component further designs a connecting portion to connect with the isolated portions. Accordingly, the feed mechanism of mold designs a connecting recess to shape the connecting portion and connect with the molding cavities. The plastics are injected into the molding cavities through the connecting recess and the runner for forming the isolated portions. Meanwhile, the connecting portion is shaped through the connecting recess. After the component is finished in the long run, the connecting portion is removed. However, the design process and the remove process of the connecting portion waste extra manpower and material resources and need to be superseded with a simple method. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a feed mechanism of mold, which has a first runner and a second runner instead of a connecting portion of a component so as to save manpower and material resources. 
     The feed mechanism of mold includes a top plate, an injection body and two slides. The top plate defines a recess in the bottom thereof. The injection body is disposed in the top of the top plate and stretches into the recess. The top of the injection body defines a sprue, a first pouring runner and a second runner both connecting with the sprue. A lower end of the first pouring runner penetrates through the injection body. A lower portion of the second runner defines a second tail runner and a pulling mouth. The two slides are received in two sides of the recess of the top plate respectively. Each of the slides has a mating surface. The two mating surfaces of the two slides match each other. A shaping recess is defined between the two mating surfaces for receiving a core insert therein and communicates with the pulling mouth. An injection runner is defined between the two mating surfaces and adjacent to the shaping recess. The injection runner connects with the lower end of the first pouring runner of the injection body to define a first runner. A lower portion of the injection runner defines a first tail runner and a pulling runner. Two molding cavities are defined among the slides, the core insert and the injection body and isolated by the core insert. The two molding cavities connect with the first tail runner and the second tail runner respectively. 
     As described above, in use, plastics are injected into one molding cavity through the second runner and injected into the other molding cavity through the first runner instead of increasing the connecting portion on the component. Therefore, the design process and the remove process of the connecting portion can be omitted so as to save manpower and material resources. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       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: 
         FIG. 1  is a cross-sectional view of a feed mechanism of mold configured on a bottom plate in accordance with the present invention; 
         FIG. 2  is a perspective view of a top plate of the feed mechanism of mold of  FIG. 1 ; 
         FIG. 3  is a perspective view of an injection body of the feed mechanism of mold of  FIG. 1 , the injection body is dissected partly; and 
         FIG. 4  is a perspective view of two slides of the feed mechanism of mold of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference to  FIG. 1 , a feed mechanism of mold according to the present invention is configured on a bottom plate  40 . The bottom plate  40  disposes a core insert  41  on the top thereof, a first puller  42  apart from the left of the core insert  41  and a second puller  43  on the top of the core insert  41 . The feed mechanism of mold includes a top plate  50 , a top clamping plate  60 , an injection body  80  and two slides  90 . 
     Referring to  FIG. 1  and  FIG. 2 , the top plate  50  is of rectangular shape in substance and the bottom thereof concaves upward to form a recess  51 . The recess  51  is of rectangular shape through a front view and is of isosceles trapezoid shape through a lateral view. The recess  51  defines two ramps  53  inclining outside from top to bottom and facing to each other. The middle of the recess  51  extends upward to penetrate through the top of the top plate  50  for defining a rectangular hole  52 . The top of the hole  52  extends toward two sides to form a pair of shoulder cavities (not shown). The top clamping plate  60  is fixed on the top of the top plate  50  and defines a funnel-shaped aperture  61  penetrating through from top to bottom. 
     Referring to  FIG. 3 , the injection body  80  is of rectangular shape in substance and the top thereof protrudes toward two sides to form a pair of shoulder  85  corresponding to the shoulder cavities of the top plate  50 . The top of the injection body  80  defines an arc sprue  81 . The bottom of the sprue  81  diverges toward two sides to respectively extend downward to penetrate through the bottom of the injection body  80  for defining a first pouring runner  82  and a second pouring runner  83  locating on the right of the first pouring runner  82 . The first pouring runner  82  and the second pouring runner  83  thicken gradually from top to bottom. The bottom of the second pouring runner  83  extends rightward and inclines upward to penetrate through the outside of the injection body  80  for defining a second tail runner  84  thinning gradually from bottom to top. A pulling mouth  86  is defined at the junction of the second pouring runner  83  and the second tail runner  84 . The second pouring runner  83 , the pulling mouth  86  and the second tail runner  84  define a second runner. 
     Referring to  FIGS. 1 and 4 , each of the two slides  90  has a mating surface  91  and an inclined plane  97  defined at two opposite sides of the slide  90 . The two mating surfaces  91  of the two slides  90  face to each other and match with each other. The inclined plane  97  inclines outside from top to bottom and matches the respective ramp  53  of the top plate  50 . The mating surface  91  defines a shaping recess  92  for receiving half of the core insert  41 . The top of the mating surface  91  opens a gap  93  communicating with the shaping recess  92 . The mating surface  91  further defines a connecting channel  94  located on the left of the shaping recess  92  and on a line with the first pouring runner  82  of the injection body  80 . The middle of the connecting channel  94  is thinner than two ends thereof. The top of the connecting channel  94  communicates with the bottom of the gap  93 . The bottom of the connecting channel  94  diverges to respectively extend downward for defining a tail channel  95  communicating with the shaping recess  92  and a pulling channel  96 . The pulling channel  96  inclines leftward and then extends downward to penetrate through the bottom of the slide  90 . 
     Referring to  FIGS. 1-4 , in assembly, the injection body  80  is disposed in the hole  52  of the top plate  50 . The shoulder  85  buckles into the corresponding shoulder cavity and the bottom of the injection body  80  stretches into the recess  51  of the top plate  50 . The top clamping plate  60  is fixed on the top of the top plate  50 . The bottom of the aperture  61  connects with the sprue  81  of the injection body  80 . The two slides  90  are received in the recess  51  of the top plate  50  and the inclined planes  97  match with the ramps  53  of the top plate  50  on the top of the bottom plate  40 . When the feed mechanism of mold and the bottom plate  40  are closed, the mating surfaces  91  of the two slides  90  match each other. The two gaps  93  join together to receive the bottom of the injection body  80 . The two shaping recesses  92  join together to receive the core insert  41 . The second puller  43  is inserted into the pulling mouth  86  of the injection body  80 . The two pulling channels  96  join together to form a pulling runner for receiving the first puller  42 . The two connecting channels  94  buckle with each other to form a connecting runner and the two tail channels  95  buckle with each other to form a first tail runner. The connecting runner, the first tail runner and the pulling runner define an injection runner. The top of the connecting runner connects with the bottom of the first pouring runner  82  of the injection body  80 . The first pouring runner  82  and the injection runner define a first runner. The slides  90  and the core insert  41  define a first molding cavity  101  located on the left of the core insert  41  and connecting with the first tail runner for molding an isolated portion. The injection body  80 , the slides  90  and the core insert  41  define a second molding cavity  102  located on the right of the core insert  41  and connecting with the second tail runner  84  for molding another isolated portion. 
     When the feed mechanism of mold and the bottom plate  40  are opened, the top clamping plate  60  and the top plate  50  move upward and further drive the injection body  80  to move upward. The second puller  43  separates from the pulling mouth  86  of the injection body  80  so that plastics remained in the second runner is easier to be cleaned away. Meanwhile, the two slides  90  are pulled by the first puller  42  to stay on the top of the bottom plate  40 . Then, under the action of corresponding structures of the bottom plate  40 , the two slides  90  horizontally slide to separate from each other. At this moment, the two isolated portions can be withdrawn. And then, the top clamping plate  60  and the top plate  50  move downward and further drive the injection body  80  to move downward. Meanwhile, the inclined planes  97  of the slides  90  and the respective ramps  53  of the top plate  50  interact with each other to drive the slides  90  to horizontally slide along the ramps  53  to match with each other again. 
     As described above, in use, the two isolated portions of a component are manufactured respectively by injecting the plastics into the first molding cavity  101  through the first runner and by injecting the plastics into the second molding cavity  102  through the second runner instead of increasing a connecting portion on the component. Therefore, the design process and the remove process of the connecting portion can be omitted so as to save manpower and material resources.