1. Field of the Invention
The present invention relates to an injection mold, and particularly to an injection mold with a side core-pulling mechanism.
2. The Related Art
A conventional injection mold includes a fixed mold and a movable mold engaged with the fixed mold. The movable mold has a sliding plate slidably mounted thereon. The fixed mold includes an angular pin slantwise fastened in the fixed mold and further projecting beyond a bottom of the fixed mold. When the injection mold is closed and opened, the angular pin can drive the sliding plate to slide sideward on the movable mold so as to achieve the side core-pulling function. Furthermore, the angular pin can also work as a fastening element acting on the sliding plate of the movable mold to prevent the sliding plate from sliding away from the initial position when the melting plastic is injected into the injection mold at the mold-closing position.
However, the force of the angular pin acting on the sliding plate is not powerful enough to prevent the sliding plate from sliding away from the initial position when the melting plastic is injected into the injection mold.
Accordingly, an object of the present invention is to provide an injection mold. The injection mold includes a fixed mold having a clamping plate and a fixed plate mounted underneath the clamping plate. The fixed plate defines a through hole slantwise extending to penetrate through the fixed plate. An angular pin has an upper end fastened in the through hole of the fixed plate and a lower end projected underneath the fixed plate. A side-compression block is fastened underneath the fixed plate and spaced from the lower end of the angular pin. The side-compression block has a base body and a securing portion protruded downward from a bottom surface of the base body. A movable mold movably engaged with the fixed mold has a movable plate and a sliding plate slidably mounted on the movable plate and capable of sliding sideward on the movable plate under the actions of the lower end of the angular pin and the side-compression block. The sliding plate defines a guiding hole having a corresponding diameter to that of the lower end of the angular pin and slantwise extending to penetrate through a top of the sliding plate for being connected in alignment with the through hole to receive the lower end of the angular pin therein when the injection mold is closed. A top surface of the movable plate defines a securing groove for securing the securing portion of the side-compression block therein to make the base body resist against the sliding plate when the injection mold is at the mold-closing position.
As described above, the side-compression block has the securing portion secured in the securing groove of the movable plate to strengthen the locking forces between the fixed mold and the movable mold and further make the side-compression block firmly resist against the sliding plate, so that can avoid the sliding plate moving horizontally even though excessive injecting force acts on the sliding plate when the melting plastic is injected into the injection mold.
The present invention will be apparent to those skilled in the art by reading the following description thereof, with reference to the attached drawings, in which:
Referring to the drawings in greater detail, and first to
Refer to
The movable mold 10 movably engaged with the fixed mold 20 has a movable plate 11 and a sliding plate 12 slidably mounted on the movable plate 10. The sliding plate 12 defines a guiding hole 121 having a corresponding diameter to that of the through hole 221 of the fixed plate 22 and slantwise extending to penetrate through the sliding plate 12 for being connected in alignment with the through hole 221, when the injection mold 100 is closed. In this embodiment, the sliding plate 12 has a left side face designed as an inclined face 122 matching with the side-compression surface 244 of the base body 241 to make the sliding plate 12 slide on the movable plate 11 under the action of the side-compression surface 244 of the base body 241, in the process of the movable mold 10 moving towards the fixed mold 20. A top surface of the movable plate 11 defines a receiving groove 111 for receiving a distal end of the angular pin 23 therein, and a securing groove 112 opened between a left side surface of the movable plate 11 and the receiving groove 111 for securing the securing portion 242 of the side-compression block 24 therein, when the injection mold 100 is closed.
Refer to
In the process of the injection mold 100 being closed, the lower end of the angular pin 23 is inserted into the guiding hole 121 of the sliding plate 12 and the side-compression surface 244 of the side-compression block 24 is against the inclined face 122 of the sliding plate 12. Then the movable mold 10 keeps on moving towards the fixed mold 20, and the sliding plate 12 slides sideward on the movable plate 11 by means of the action of the side-compression surface 244 against the inclined face 122 and the cooperation between the lower end of the angular pin 23 and the guiding hole 121. When the injection mold 100 is completely closed, the distal end of the angular pin 23 is received in the receiving groove 111 of the movable plate 11. The securing portion 242 of the side-compression block 24 is secured in the securing groove 112 for strengthening the locking forces between the fixed mold 20 and the movable mold 10 and further making the side-compression block 24 firmly resist against the sliding plate 12 to prevent the movement of the sliding plate 12. In the process of separating the movable mold 10 from the fixed mold 20, the sliding plate 12 of the movable mold 10 slides sideward and downward along the side-compression surface 244 by means of the actions between the angular pin 23 and the guiding hole 121 of the sliding plate 12.
As described above, the side-compression block 24 has the securing portion 242 secured in the securing groove 112 of the movable plate 11 to strengthen the locking forces between the fixed mold 20 and the movable mold 10 and further make the side-compression block 24 firmly resist against the sliding plate 12, so that can avoid the sliding plate 12 moving horizontally even though excessive injecting force acts on the sliding plate 12 when the melting plastic is injected into the injection mold 100.
The foregoing description of the present invention has been presented for the 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.